CN111025349A - BOC signal demodulation method and chip and equipment thereof - Google Patents
BOC signal demodulation method and chip and equipment thereof Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 50
- 238000012545 processing Methods 0.000 claims abstract description 33
- KAKIEONGVIRLLB-UHFFFAOYSA-N CBOC Chemical group CBOC KAKIEONGVIRLLB-UHFFFAOYSA-N 0.000 claims description 8
- 230000010363 phase shift Effects 0.000 claims description 7
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- 238000011161 development Methods 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 125000005931 tert-butyloxycarbonyl group Chemical group [H]C([H])([H])C(OC(*)=O)(C([H])([H])[H])C([H])([H])[H] 0.000 description 51
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
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Abstract
According to the BOC signal demodulation method provided by the embodiment of the invention, different processing is carried out on the first intermediate frequency signal in the first intermediate frequency signal branch and the second intermediate frequency signal in the second intermediate frequency signal branch according to different BOC signal types, the demodulation processing on different types of BOC signals can be completed through one demodulation method, the demodulation process of the BOC signals is simplified, and the development and manufacturing cost of a chip is correspondingly reduced.
Description
Technical Field
The invention relates to the technical field of satellite navigation, in particular to the field of satellite signal demodulation.
Background
In the respective modern GNSS signal designs, the BOC modulation techniques are applied, but different BOCs are used. Therefore, for a receiver chip supporting the modern GNSS signals, it is necessary to have various BOC signal demodulation capabilities. If multiple BOC demodulators are designed independently according to the characteristics of each BOC technology, the development and manufacturing costs of the chip will be increased, and improvements are needed.
Based on the situation, the invention provides a demodulation method fusing multiple BOCs.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, it is an object of the present invention to propose a demodulation method capable of fusing multiple BOC signals.
The BOC signal demodulation method provided by the embodiment of the invention comprises the following steps:
s100: dividing the intermediate frequency signal into a first intermediate frequency signal and a second intermediate frequency signal, and respectively entering a first intermediate frequency signal branch and a second intermediate frequency signal branch;
s101: according to different BOC signal types, different processing is carried out on a first intermediate frequency signal in a first intermediate frequency signal branch and a second intermediate frequency signal in a second intermediate frequency signal branch;
s102: if the demodulated BOC signal type is a QMBOC signal, performing 90-degree phase shift processing on the first intermediate-frequency signal in a first intermediate-frequency signal branch;
s103: in a first intermediate frequency signal branch, multiplying the first intermediate frequency signal after phase shift processing and BOC (1,1) subcarrier with the sequence of [1, -1] by a symbol multiplier, and outputting the demodulated first intermediate frequency signal; in a second intermediate frequency signal branch, the second intermediate frequency signal and a BOC (6,1) subcarrier with a sequence of [1, -1] are subjected to multiplication operation through a symbol multiplier, and a demodulated second intermediate frequency signal is output;
s104: and adding the demodulated first intermediate frequency signal and the demodulated second intermediate frequency signal, and obtaining the energy amplitude of the signal through an adder to finish demodulation.
According to the BOC signal demodulation method provided by the embodiment of the invention, different processing is carried out on the first intermediate frequency signal in the first intermediate frequency signal branch and the second intermediate frequency signal in the second intermediate frequency signal branch according to different BOC signal types, the demodulation processing on different types of BOC signals can be completed through one demodulation method, the demodulation process of the BOC signals is simplified, and the development and manufacturing cost of a chip is correspondingly reduced.
In addition, the BOC signal demodulation method according to the above embodiment of the present invention may further have the following additional technical features:
in an embodiment of the present invention, step S101 is followed by the following steps:
s201: if the type of the demodulated BOC signal is a CBOC signal, in the first intermediate frequency signal branch, performing multiplication operation on the first intermediate frequency signal and a BOC (1,1) subcarrier with the sequence of [1, -1] through a symbol multiplier, and outputting the demodulated first intermediate frequency signal; in a second intermediate frequency signal branch, multiplying the second intermediate frequency signal by a BOC (6,1) subcarrier with the sequence of [1, -1] through a symbol multiplier, and outputting a demodulated second intermediate frequency signal;
s202: and adding the demodulated first intermediate frequency signal and the demodulated second intermediate frequency signal, and obtaining the energy amplitude of the signal through an adder to finish demodulation.
In an embodiment of the present invention, step S101 is followed by the following steps:
s301: if the demodulated BOC signal type is a TMBOC signal, alternately connecting a first intermediate frequency signal branch and a second intermediate frequency signal branch according to a preset time division characteristic parameter so as to enable one of the first intermediate frequency signal and the second intermediate frequency signal to be subjected to subsequent processing, and switching off the other one of the first intermediate frequency signal and the second intermediate frequency signal;
s302: if the first intermediate frequency signal branch is communicated, the first intermediate frequency signal and BOC (1,1) subcarrier with the sequence of [1, -1] carry out multiplication operation through a symbol multiplier, and the demodulated first intermediate frequency signal is output;
s303: and the energy amplitude of the demodulated first intermediate frequency signal is obtained through an adder to complete demodulation.
In an embodiment of the present invention, after step S301, the method further includes the following steps:
s401: if the second intermediate frequency signal branch is communicated, the second intermediate frequency signal and the BOC (6,1) subcarrier with the sequence of [ 1-1 ] carry out multiplication operation through a symbol multiplier, and the demodulated second intermediate frequency signal is output;
s402: and the demodulated second intermediate frequency signal obtains the energy amplitude of the signal through an adder to complete demodulation.
Another objective of the present invention is to provide a GNSS satellite positioning and navigation chip, which includes:
the phase shifter is used for performing 90-degree phase shifting processing on the first intermediate frequency signal; after receiving the enabling signal of the control module, the phase shifter carries out phase shifting processing on the first intermediate frequency signal and sends the first intermediate frequency signal to a first multiplier; after receiving a bypass signal of the control module, the phase shifter sends a first intermediate frequency signal to a first multiplier;
a first multiplier electrically connected to the phase shifter; after the first multiplier receives the communication signal sent by the control module, the first multiplier sends the received signal to the first symbol multiplier; after the first multiplier receives a turn-off signal sent by the control module, the received signal is not sent to the first symbol multiplier;
a BOC (1,1) subcarrier demodulation module, the BOC (1,1) subcarrier demodulation module to output a BOC (1,1) subcarrier of sequence [1, -1] to a first symbol multiplier;
the first symbol multiplier is electrically connected with the first multiplier, receives the BOC (1,1) subcarrier with the sequence of [1, -1] output by the BOC (1,1) subcarrier demodulation module, and is used for multiplying the BOC (1,1) subcarrier with the sequence of [1, -1] by a signal sent by the first multiplier and outputting a demodulated first intermediate frequency signal;
a second multiplier; after receiving the communication signal sent by the control module, the second multiplier sends a second intermediate frequency signal to a second symbol multiplier; after the second multiplier receives a turn-off signal sent by the control module, the second intermediate frequency signal is not sent to the second symbol multiplier;
a BOC (6,1) subcarrier demodulation module, the BOC (6,1) subcarrier demodulation module being configured to output BOC (6,1) subcarriers of sequence [1, -1 ];
the second symbol multiplier is electrically connected with the second multiplier, receives the BOC (6,1) subcarrier with the sequence of [1, -1] output by the BOC (6,1) subcarrier demodulation module, and is used for multiplying the BOC (6,1) subcarrier with the sequence of [1, -1] by a signal sent by the second multiplier and outputting a demodulated second intermediate frequency signal;
the adder is electrically connected with the first symbol multiplier and the second symbol multiplier respectively, receives the demodulated first intermediate frequency signal and/or the demodulated second intermediate frequency signal, and obtains the energy amplitude of the demodulated first intermediate frequency signal and/or the demodulated second intermediate frequency signal; and
a control module, configured to send an enable signal or a bypass signal to the phase shifter, a connect signal or a disconnect signal to the first multiplier, and a connect signal or a disconnect signal to the second multiplier.
In one embodiment of the present invention, the control module further comprises: and the control switch is used for sending a connection signal or a disconnection signal to the first multiplier and sending a connection signal or a disconnection signal to the second multiplier.
It is still another object of the present invention to provide a GNSS satellite positioning and navigation chip configured to apply the BOC signal demodulation method described above.
The invention further aims to provide navigation equipment which comprises the GNSS satellite positioning navigation chip.
Another objective of the present invention is to provide a vehicle, which includes the GNSS satellite positioning and navigation chip.
The invention also aims to provide a vehicle comprising the GNSS satellite positioning and navigation chip.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow chart of a BOC signal demodulation method according to an embodiment of the present invention;
FIG. 2 is another flow chart of a BOC signal demodulation method according to an embodiment of the present invention;
FIG. 3 is another flow chart of a BOC signal demodulation method according to an embodiment of the present invention;
FIG. 4 is a block diagram of a GNSS satellite positioning and navigation chip according to an embodiment of the present invention.
Reference numerals:
a phase shifter 10;
a first multiplier 11;
BOC (1,1) subcarrier demodulation module 12;
a first sign multiplier 13;
a second multiplier 14;
BOC (6,1) subcarrier demodulation module 15;
a second sign multiplier 16;
an adder 17;
a control module 18;
controlling the switch 19.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes a BOC signal demodulation method according to an embodiment of the present invention with reference to the drawings.
As shown in fig. 1 to 4, a BOC signal demodulation method according to an embodiment of the present invention includes the following steps:
t100: dividing the intermediate frequency signal into a first intermediate frequency signal and a second intermediate frequency signal, and respectively entering a first intermediate frequency signal branch and a second intermediate frequency signal branch;
t101: according to different BOC signal types, different processing is carried out on a first intermediate frequency signal in a first intermediate frequency signal branch and a second intermediate frequency signal in a second intermediate frequency signal branch;
t102: if the demodulated BOC signal type is a QMBOC signal, performing 90-degree phase shift processing on the first intermediate-frequency signal in a first intermediate-frequency signal branch;
t103: in a first intermediate frequency signal branch, multiplying the first intermediate frequency signal after phase shift processing and BOC (1,1) subcarrier with the sequence of [1, -1] by a symbol multiplier, and outputting the demodulated first intermediate frequency signal; in a second intermediate frequency signal branch, the second intermediate frequency signal and a BOC (6,1) subcarrier with a sequence of [1, -1] are subjected to multiplication operation through a symbol multiplier, and a demodulated second intermediate frequency signal is output;
t104: and adding the demodulated first intermediate frequency signal and the demodulated second intermediate frequency signal, and obtaining the energy amplitude of the signal through an adder to finish demodulation.
In actual GNSS signals, the united states and civilian signals in the european union in the L1/E1 band together recommend an optimized spread spectrum modulation method called hybrid binary offset carrier (MBOC), i.e., BOC (6,1) spread spectrum symbols are added on the basis of BOC (1,1) modulation, so that the MBOC modulated signal has better frequency performance at high frequencies (mainly in the vicinity of ± 6 MHz) than BOC (1, 1). Under the common standard of MBOC, the large GNSS systems (Beidou: QMBOC; GPS: TMBOC; Galileo: CBOC) respectively design respective implementation modes from the directions of time multiplexing, phase multiplexing, complex form and the like. However, from the design of the receiver chip, in the related art, the positioning and navigation chip usually needs to set different BOC demodulators according to different BOC signal types, thereby increasing the development and manufacturing cost of the chip. According to the BOC signal demodulation method provided by the embodiment of the invention, different processing is carried out on the first intermediate frequency signal in the first intermediate frequency signal branch and the second intermediate frequency signal in the second intermediate frequency signal branch according to different BOC signal types, the demodulation processing on different types of BOC signals can be completed through one demodulation method, the demodulation process of the BOC signals is simplified, and the development and manufacturing cost of a chip is correspondingly reduced.
In an embodiment of the present invention, step T101 further includes the following steps:
t201: if the type of the demodulated BOC signal is a CBOC signal, in the first intermediate frequency signal branch, performing multiplication operation on the first intermediate frequency signal and a BOC (1,1) subcarrier with the sequence of [1, -1] through a symbol multiplier, and outputting the demodulated first intermediate frequency signal; in a second intermediate frequency signal branch, multiplying the second intermediate frequency signal by a BOC (6,1) subcarrier with the sequence of [1, -1] through a symbol multiplier, and outputting a demodulated second intermediate frequency signal;
t202: and adding the demodulated first intermediate frequency signal and the demodulated second intermediate frequency signal, and obtaining the energy amplitude of the signal through an adder to finish demodulation.
Therefore, according to the BOC signal demodulation method provided by the embodiment of the invention, the demodulation of the CBOC signal can be completed, so that the demodulation processing of the CBOC signal and the QMBOC signal can be completed by one demodulation method, and the demodulation process of the BOC signal is simplified.
In an embodiment of the present invention, step T101 further includes the following steps:
t301: if the demodulated BOC signal type is a TMBOC signal, alternately connecting a first intermediate frequency signal branch and a second intermediate frequency signal branch according to a preset time division characteristic parameter so as to enable one of the first intermediate frequency signal and the second intermediate frequency signal to be subjected to subsequent processing, and switching off the other one of the first intermediate frequency signal and the second intermediate frequency signal;
t302: if the first intermediate frequency signal branch is communicated, the first intermediate frequency signal and BOC (1,1) subcarrier with the sequence of [1, -1] carry out multiplication operation through a symbol multiplier, and the demodulated first intermediate frequency signal is output;
t303: and the energy amplitude of the demodulated first intermediate frequency signal is obtained through an adder to complete demodulation.
Further, step T301 is followed by the following steps:
t401: if the second intermediate frequency signal branch is communicated, the second intermediate frequency signal and the BOC (6,1) subcarrier with the sequence of [ 1-1 ] carry out multiplication operation through a symbol multiplier, and the demodulated second intermediate frequency signal is output;
t402: and the demodulated second intermediate frequency signal obtains the energy amplitude of the signal through an adder to complete demodulation.
Therefore, according to the BOC signal demodulation method provided by the embodiment of the invention, demodulation when the signal type is the TMBOC signal can be completed, so that the demodulation processing of the CBOC signal, the QMBOC signal and the TMBOC signal can be completed by one demodulation method, and the demodulation process of the BOC signal is simplified.
Another objective of the present invention is to provide a GNSS satellite positioning and navigation chip, which includes: phase shifter 10, first multiplier 11, BOC (1,1) subcarrier demodulation module 12, first symbol multiplier 13, second multiplier 14, BOC (6,1) subcarrier demodulation module 15, second symbol multiplier 16, adder 17 and control module 18.
The phase shifter 10 is configured to perform 90-degree phase shifting processing on the first intermediate frequency signal; after receiving the enable signal of the control module 18, the phase shifter 10 performs phase shifting processing on the first intermediate frequency signal and sends the first intermediate frequency signal to the first multiplier 11; the phase shifter 10, upon receiving the bypass signal of the control module 18, sends the first intermediate frequency signal to the first multiplier 11.
The first multiplier 11 is electrically connected with the phase shifter 10; after receiving the connection signal sent by the control module 18, the first multiplier 11 sends the received signal to the first symbol multiplier 13; after receiving the shutdown signal from the control module 18, the first multiplier 11 does not send the received signal to the first symbol multiplier 13.
The BOC (1,1) subcarrier demodulation module 12 is configured to output BOC (1,1) subcarriers having a sequence of [1, -1] to the first symbol multiplier 13.
The first symbol multiplier 13 is electrically connected to the first multiplier 11, the first symbol multiplier 13 receives BOC (1,1) subcarriers with a sequence of [1, -1] output by the BOC (1,1) subcarrier demodulation module 12, and the first symbol multiplier 13 is configured to multiply the BOC (1,1) subcarriers with the sequence of [1, -1] by a signal sent by the first multiplier 11, and output a demodulated first intermediate frequency signal.
After receiving the connection signal sent by the control module 18, the second multiplier 14 sends the second intermediate frequency signal to the second symbol multiplier 16; after receiving the shutdown signal from the control module 18, the second multiplier 14 does not send the second intermediate frequency signal to the second symbol multiplier 16.
The BOC (6,1) subcarrier demodulation module 15 is configured to output BOC (6,1) subcarriers having a sequence of [1, -1 ].
The second symbol multiplier 16 is electrically connected to the second multiplier 14, the second symbol multiplier 16 receives BOC (6,1) subcarriers with the sequence [1, -1] output by the BOC (6,1) subcarrier demodulation module 15, and the second symbol multiplier 16 is configured to multiply the BOC (6,1) subcarriers with the sequence [1, -1] by a signal sent by the second multiplier 14 and output a demodulated second intermediate frequency signal.
The adder 17 is electrically connected to the first symbol multiplier 13 and the second symbol multiplier 16, respectively, and the adder 17 receives the demodulated first intermediate frequency signal and/or the demodulated second intermediate frequency signal and obtains an energy amplitude of the demodulated first intermediate frequency signal and/or the demodulated second intermediate frequency signal. The control module 18 is configured to send an enable signal or a bypass signal to the phase shifter 10, a connect signal or a disconnect signal to the first multiplier 11, and a connect signal or a disconnect signal to the second multiplier 14.
According to the GNSS satellite positioning navigation chip provided by the embodiment of the invention, the phase shifter 10, the first multiplier 11, the first symbol multiplier 13 and the adder 17 are sequentially and electrically connected to form a first intermediate frequency signal branch, and the second multiplier 14, the second symbol multiplier 16 and the adder 17 are sequentially and electrically connected to form a second intermediate frequency signal branch. The intermediate frequency signal is divided into a first intermediate frequency signal and a second intermediate frequency signal, which enter the first intermediate frequency signal and the second intermediate frequency signal, respectively.
If the BOC signal type demodulated by the GNSS satellite positioning navigation chip is a QMBOC signal, in the first intermediate frequency signal branch, the control module 18 sends an enable signal to the phase shifter 10, and after receiving the enable signal sent by the control module 18, the phase shifter 10 performs 90-degree phase shift processing on the first intermediate frequency signal. The control module 18 sends a connection signal to the first multiplier 11, and after the first multiplier 11 receives the connection signal sent by the control module 18, the first multiplier 11 sends the phase-shifted first intermediate frequency signal to the first symbol multiplier 13. The first symbol multiplier 13 multiplies the phase-shifted first intermediate frequency signal by a BOC (1,1) subcarrier having a sequence of [1, -1], outputs a demodulated first intermediate frequency signal, and sends the demodulated first intermediate frequency signal to the adder 17. In the second intermediate frequency signal branch, the control module 18 sends a connection signal to the second multiplier 14, and after the second multiplier 14 receives the connection signal sent by the control module 18, the second multiplier 14 sends the second intermediate frequency signal to the second symbol multiplier 16. The second symbol multiplier 16 multiplies the second intermediate frequency signal by a BOC (6,1) subcarrier with a sequence of [1, -1] by a symbol multiplier, outputs a demodulated second intermediate frequency signal, and sends the demodulated second intermediate frequency signal to the adder 17. The demodulated first intermediate frequency signal and the demodulated second intermediate frequency signal are added by an adder 17 to obtain the energy amplitude of the signal, thereby completing the demodulation.
If the BOC signal type demodulated by the GNSS satellite positioning navigation chip is a CBOC signal, in the first intermediate frequency signal branch, the control module 18 sends a bypass signal to the phase shifter 10, and after receiving the bypass signal sent by the control module 18, the phase shifter 10 sends the first intermediate frequency signal to the first multiplier 11. The control module 18 sends a connection signal to the first multiplier 11, and after the first multiplier 11 receives the connection signal sent by the control module 18, the first multiplier 11 sends the first intermediate frequency signal to the first symbol multiplier 13. The first symbol multiplier 13 multiplies the first intermediate frequency signal by a BOC (1,1) subcarrier having a sequence of [1, -1], outputs a demodulated first intermediate frequency signal, and sends the demodulated first intermediate frequency signal to the adder 17. In the second intermediate frequency signal branch, the control module 18 sends a connection signal to the second multiplier 14, and after the second multiplier 14 receives the connection signal sent by the control module 18, the second multiplier 14 sends the second intermediate frequency signal to the second symbol multiplier 16. The second symbol multiplier 16 multiplies the second intermediate frequency signal by a BOC (6,1) subcarrier with a sequence of [1, -1] by a symbol multiplier, outputs a demodulated second intermediate frequency signal, and sends the demodulated second intermediate frequency signal to the adder 17. The demodulated first intermediate frequency signal and the demodulated second intermediate frequency signal are added by an adder 17 to obtain the energy amplitude of the signal, thereby completing the demodulation.
If the BOC signal type demodulated by the GNSS satellite positioning navigation chip is a TMBOC signal, the control module 18 sends a bypass signal to the phase shifter 10, the control module 18 alternately sends a connection signal to the first multiplier 11 or the second multiplier 14 according to a preset time division characteristic parameter, and correspondingly sends a disconnection signal to the second multiplier 14 or the first multiplier 11 to connect the first intermediate frequency signal branch or the second intermediate frequency signal branch. If the first if signal branch is connected, the first multiplier 11 sends the first if signal to the first symbol multiplier 13. The first symbol multiplier 13 multiplies the first intermediate frequency signal by a BOC (1,1) subcarrier having a sequence of [1, -1], outputs a demodulated first intermediate frequency signal, and sends the demodulated first intermediate frequency signal to the adder 17. The demodulated first intermediate frequency signal is processed by obtaining the energy amplitude of the signal through the adder 17 to complete the demodulation. If the second if signal branch is connected, the second multiplier 14 sends the second if signal to the second symbol multiplier 16. The second symbol multiplier 16 multiplies the second intermediate frequency signal by a BOC (6,1) subcarrier with a sequence of [1, -1] by a symbol multiplier, outputs a demodulated second intermediate frequency signal, and sends the demodulated second intermediate frequency signal to the adder 17. The demodulated second intermediate frequency signal is demodulated by obtaining the energy amplitude of the signal through the adder 17.
Therefore, according to the GNSS satellite positioning navigation chip provided by the embodiment of the invention, different processing is carried out on the first intermediate frequency signal in the first intermediate frequency signal branch and the second intermediate frequency signal in the second intermediate frequency signal branch according to different BOC signal types, the demodulation processing of different types of BOC signals can be completed through one demodulation process, the demodulation process of the BOC signals is simplified, and the development and manufacturing cost of the chip is correspondingly reduced.
In one embodiment of the present invention, the control module 18 further comprises: and a control switch 19, wherein the control switch 19 is used for sending a connection signal or a disconnection signal to the first multiplier 11 and sending a connection signal or a disconnection signal to the second multiplier 14.
It is still another object of the present invention to provide a GNSS satellite positioning and navigation chip configured to apply the BOC signal demodulation method described above. Since the BOC signal demodulation method of the embodiment has the advantages of completing demodulation processing of different types of BOC signals through one demodulation process, simplifying the demodulation process of the BOC signals, and reducing development and manufacturing costs of chips, the GNSS satellite positioning navigation chip using the BOC signal demodulation method also has corresponding advantages, which are not described herein again.
The invention further aims to provide navigation equipment which comprises the GNSS satellite positioning navigation chip. Since the GNSS satellite positioning and navigation chip of the above embodiment completes the demodulation processing of different types of BOC signals through one demodulation process, the demodulation process of the BOC signals is simplified, and the development and manufacturing costs of the chip are reduced, the navigation device using the GNSS satellite positioning and navigation chip also has corresponding beneficial effects, which are not described herein again.
Another objective of the present invention is to provide a vehicle, which includes the GNSS satellite positioning and navigation chip. The GNSS satellite positioning and navigation chip of the embodiment has the advantages that the demodulation processing of different types of BOC signals is completed through one demodulation process, the demodulation process of the BOC signals is simplified, and the development and manufacturing cost of the chip is reduced, so that a vehicle using the GNSS satellite positioning and navigation chip also has the corresponding advantages of lower cost of a satellite positioning module, simpler and more optimal positioning and resolving process, and lower positioning power consumption, and is not repeated herein.
The invention also aims to provide a vehicle comprising the GNSS satellite positioning and navigation chip. The GNSS satellite positioning and navigation chip of the embodiment has the advantages of completing demodulation processing of different types of BOC signals through one demodulation process, simplifying the demodulation process of the BOC signals, and reducing development and manufacturing costs of the chip, so that a vehicle using the GNSS satellite positioning and navigation chip also has the corresponding advantages of lower cost of a satellite positioning module, simpler and more optimal positioning and resolving process, and lower positioning power consumption, and is not repeated herein.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A BOC signal demodulation method, comprising the steps of:
s100: dividing the intermediate frequency signal into a first intermediate frequency signal and a second intermediate frequency signal, and respectively entering a first intermediate frequency signal branch and a second intermediate frequency signal branch;
s101: according to different BOC signal types, different processing is carried out on a first intermediate frequency signal in a first intermediate frequency signal branch and a second intermediate frequency signal in a second intermediate frequency signal branch;
s102: if the demodulated BOC signal type is a QMBOC signal, performing 90-degree phase shift processing on the first intermediate-frequency signal in a first intermediate-frequency signal branch;
s103: in a first intermediate frequency signal branch, multiplying the first intermediate frequency signal after phase shift processing and BOC (1,1) subcarrier with the sequence of [1, -1] by a symbol multiplier, and outputting the demodulated first intermediate frequency signal; in a second intermediate frequency signal branch, the second intermediate frequency signal and a BOC (6,1) subcarrier with a sequence of [1, -1] are subjected to multiplication operation through a symbol multiplier, and a demodulated second intermediate frequency signal is output;
s104: and adding the demodulated first intermediate frequency signal and the demodulated second intermediate frequency signal, and obtaining the energy amplitude of the signal through an adder to finish demodulation.
2. The BOC signal demodulation method according to claim 1, wherein the step S101 is followed by the step of:
s201: if the type of the demodulated BOC signal is a CBOC signal, in the first intermediate frequency signal branch, performing multiplication operation on the first intermediate frequency signal and a BOC (1,1) subcarrier with the sequence of [1, -1] through a symbol multiplier, and outputting the demodulated first intermediate frequency signal; in a second intermediate frequency signal branch, multiplying the second intermediate frequency signal by a BOC (6,1) subcarrier with the sequence of [1, -1] through a symbol multiplier, and outputting a demodulated second intermediate frequency signal;
s202: and adding the demodulated first intermediate frequency signal and the demodulated second intermediate frequency signal, and obtaining the energy amplitude of the signal through an adder to finish demodulation.
3. The BOC signal demodulation method according to claim 1, wherein the step S101 is followed by the step of:
s301: if the demodulated BOC signal type is a TMBOC signal, alternately connecting a first intermediate frequency signal branch and a second intermediate frequency signal branch according to a preset time division characteristic parameter so as to enable one of the first intermediate frequency signal and the second intermediate frequency signal to be subjected to subsequent processing, and switching off the other one of the first intermediate frequency signal and the second intermediate frequency signal;
s302: if the first intermediate frequency signal branch is communicated, the first intermediate frequency signal and BOC (1,1) subcarrier with the sequence of [1, -1] carry out multiplication operation through a symbol multiplier, and the demodulated first intermediate frequency signal is output;
s303: and the energy amplitude of the demodulated first intermediate frequency signal is obtained through an adder to complete demodulation.
4. The BOC signal demodulation method according to claim 3, wherein the step S301 is followed by the step of:
s401: if the second intermediate frequency signal branch is communicated, the second intermediate frequency signal and the BOC (6,1) subcarrier with the sequence of [ 1-1 ] carry out multiplication operation through a symbol multiplier, and the demodulated second intermediate frequency signal is output;
s402: and the demodulated second intermediate frequency signal obtains the energy amplitude of the signal through an adder to complete demodulation.
5. A GNSS satellite positioning and navigation chip is characterized by comprising:
the phase shifter is used for performing 90-degree phase shifting processing on the first intermediate frequency signal; after receiving the enabling signal of the control module, the phase shifter carries out phase shifting processing on the first intermediate frequency signal and sends the first intermediate frequency signal to a first multiplier; after receiving a bypass signal of the control module, the phase shifter sends a first intermediate frequency signal to a first multiplier;
a first multiplier electrically connected to the phase shifter; after the first multiplier receives the communication signal sent by the control module, the first multiplier sends the received signal to the first symbol multiplier; after the first multiplier receives a turn-off signal sent by the control module, the received signal is not sent to the first symbol multiplier;
a BOC (1,1) subcarrier demodulation module, the BOC (1,1) subcarrier demodulation module to output a BOC (1,1) subcarrier of sequence [1, -1] to a first symbol multiplier;
the first symbol multiplier is electrically connected with the first multiplier, receives the BOC (1,1) subcarrier with the sequence of [1, -1] output by the BOC (1,1) subcarrier demodulation module, and is used for multiplying the BOC (1,1) subcarrier with the sequence of [1, -1] by a signal sent by the first multiplier and outputting a demodulated first intermediate frequency signal;
a second multiplier; after receiving the communication signal sent by the control module, the second multiplier sends a second intermediate frequency signal to a second symbol multiplier; after the second multiplier receives a turn-off signal sent by the control module, the second intermediate frequency signal is not sent to the second symbol multiplier;
a BOC (6,1) subcarrier demodulation module, the BOC (6,1) subcarrier demodulation module being configured to output BOC (6,1) subcarriers of sequence [1, -1 ];
the second symbol multiplier is electrically connected with the second multiplier, receives the BOC (6,1) subcarrier with the sequence of [1, -1] output by the BOC (6,1) subcarrier demodulation module, and is used for multiplying the BOC (6,1) subcarrier with the sequence of [1, -1] by a signal sent by the second multiplier and outputting a demodulated second intermediate frequency signal;
the adder is electrically connected with the first symbol multiplier and the second symbol multiplier respectively, receives the demodulated first intermediate frequency signal and/or the demodulated second intermediate frequency signal, and obtains the energy amplitude of the demodulated first intermediate frequency signal and/or the demodulated second intermediate frequency signal; and
a control module, configured to send an enable signal or a bypass signal to the phase shifter, a connect signal or a disconnect signal to the first multiplier, and a connect signal or a disconnect signal to the second multiplier.
6. The GNSS satellite positioning and navigation chip is characterized in that the control module further comprises: and the control switch is used for sending a connection signal or a disconnection signal to the first multiplier and sending a connection signal or a disconnection signal to the second multiplier.
7. A GNSS satellite positioning and navigation chip, which is configured to apply the BOC signal demodulation method of any one of claims 1-4.
8. A navigation device comprising the GNSS satellite positioning and navigation chip of claim 5 or 6.
9. A vehicle comprising the GNSS satellite positioning and navigation chip of claim 5 or 6.
10. A vehicle comprising the GNSS satellite positioning and navigation chip of claim 5 or 6.
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