CN113009527A - Universal satellite navigation pseudo code generation method - Google Patents
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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
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- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/30—Acquisition or tracking or demodulation of signals transmitted by the system code related
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Abstract
The application discloses a method for generating a universal satellite navigation pseudo code, which comprises the following steps: configuring parameter information for generating pseudo codes, wherein the parameter information comprises Golden code parameter information and WEIL code parameter information; configuring a code generator matched with the type of the pseudo code according to the pseudo code request; generating, by the code generator, pseudo codes of corresponding types. All satellites of all frequency points of all navigation systems are supported, and multichannel time division multiplexing code fetching is supported. And configuring corresponding parameters according to different pseudo codes, generating corresponding code generators according to the configured parameters, and generating corresponding pseudo codes. Compared with the traditional mode, the method can greatly reduce the expenditure of logic resources, and simultaneously greatly reduces the redundant modules of different kinds of pseudo code generators from the perspective of engineering management.
Description
Technical Field
The application relates to the technical field of satellite communication, in particular to a method for generating a universal satellite navigation pseudo code.
Background
At present, the global satellite navigation system is rapidly developed, and navigation systems such as American GPS, Chinese Beidou, European Union Galileo, Russian GLONASS and the like exist. The pseudo code types and generation modes adopted by different frequency points of each navigation system in different development stages are different and are in the continuous development and evolution processes. The spreading code generator is an essential component of the satellite navigation receiver.
According to different characteristics of current frequency points, for frequency points such as L1, L2 and L5 of GPS, E5a and E5B frequency points of Galileo, G1 and G2 frequency points of GLONASS, B3I and B1I frequency points of Beidou No. two, and B2a and B2B frequency point satellites of Beidou No. three, the pseudo codes all use GOLDEN codes, but pseudo code generating polynomials of different frequency points are different. The Beidou III B1C frequency point and the GPS L1CD/P frequency point select to use WEIL codes, and the Galileo satellite E1 frequency point adopts memory codes. The different requirements of the different frequency points on the pseudo codes result in that the multimode navigation receiver needs to correspondingly generate a corresponding pseudo code generator module.
In addition, as the WEIL code is generated by the Legendre sequence, the Legendre sequence does not have a good real-time generation method at present. Therefore, the WEIL code cannot be generated in real time completely by a simple circuit configuration. The current common method is to store all the WEIL codes, and ensure the real-time requirement of the pseudo codes.
Meanwhile, for the simultaneous tracking of a plurality of satellites, each channel needs corresponding pseudo code support, and a plurality of receivers adopt a mode that each channel is independently provided with a pseudo code generator to ensure the independence and the continuity of tracking of each channel. However, each channel is adopted to configure the pseudo code generator according to the parameters, and resource overhead is greatly increased.
Disclosure of Invention
In order to solve the technical problems, the following technical scheme is provided:
in a first aspect, an embodiment of the present application provides a method for generating a generic satellite navigation pseudo code, where the method includes: configuring parameter information for generating pseudo codes, wherein the parameter information comprises Golden code parameter information and WEIL code parameter information; configuring a code generator matched with the type of the pseudo code according to the pseudo code request; generating, by the code generator, pseudo codes of corresponding types.
By adopting the implementation mode, all satellites of all frequency points of all navigation systems are supported, and multichannel time division multiplexing code fetching is supported. And configuring corresponding parameters according to different pseudo codes, generating corresponding code generators according to the configured parameters, and generating corresponding pseudo codes. Compared with the traditional mode, the method can greatly reduce the expenditure of logic resources, and simultaneously greatly reduces the redundant modules of different kinds of pseudo code generators from the perspective of engineering management.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the configuring parameter information of the generated pseudo code includes: and after the parameters are obtained, storing the parameters under the appointed memory address according to the channel, and waiting for the generation and the use of the pseudo code.
With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, for the WEIL code, only the Legendre sequence is stored, and the calculated Legendre sequence is written into the specified storage RAM at the time of initialization.
With reference to the first possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, configuring a Golden code generator, where configuring, according to a pseudo code request, a code generator matching a pseudo code type includes: reading corresponding parameters according to the serial number and the generated address of the code fetching channel; the two linear sequences G1 and G2 are provided with initial shift register values u32InitG1 and u32InitG 2; configuring polynomial taps u32CoefG1, u32CoefG2 for two linear sequences G1 and G2; configuring mask values u32MaskG1 and u32MaskG2 for two linear sequences G1 and G2; configuring truncation lengths u32TrunckLen1 and u32TrunckLen2 for two linear sequences G1 and G2; reading in history information such as states of two linear sequences G1 and G2 shift registers of a specified channel, pseudo code counting and the like; after parameter configuration is completed, the relevant flag is set high to wait for code fetching signals.
With reference to the second possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, configuring a WEIL code generator, where the configuring, according to a pseudo code request, a code generator matching a pseudo code type includes: reading corresponding parameters according to the serial number and the generated address of the code fetching channel; configuring sequence initial values u32PrInit _ a and u32PrInit _ b for the two Legendre sequences; configuring a WEIL code sequence length u32WEILLen and a truncation length u32 TruckLen; reading in historical information such as address counting, inserting code counting, pseudo code counting and the like of two Legendre sequences of a specified channel; after parameter configuration is completed, the relevant flag is set high to wait for code fetching signals.
With reference to the third possible implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, the generating, by the code generator, pseudo codes of corresponding types includes: according to the pseudo code fetching signal and the enabling switch, two linear sequences G1 and G2 are pushed to carry out shifting operation based on the configured initial value of the shift register, and chip counting is started at the same time; when the chip count reaches the configuration truncation length of G1 or G2, restoring the G1 or G2 sequence to the initial value correspondingly; according to the configured polynomial tap, selecting the exclusive OR addition of the corresponding BIT BITs in the two linear sequences G1 and G2 as new input BITs; according to the configured mask value, corresponding BIT BITs in two linear sequences G1 and G2 are selected to be subjected to exclusive OR addition to obtain a G1 sequence and a G2 sequence to be output, and then the modulo-2 sum of the two sequences is used as the Golden code of the channel to be output; and generating a pseudo code effective mark for facilitating the use of a later stage.
With reference to the fourth possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, the generating, by the code generator, pseudo codes of corresponding types includes: pushing the two Legendre sequences to perform incremental operation based on the configured initial address according to the pseudo code fetching signal and the enabling switch, and starting chip counting at the same time; if the address reaches the address position of the inserted code, pausing counting and address increment, starting the inserted code, and recovering normal counting and address increment after the insertion operation of the inserted code is completed; if the chip count reaches the truncation length, returning to the initial configuration; modulo 2 of two Legendre sequences and a WEIL code as the channel; and generating a pseudo code effective mark for facilitating the use of a later stage.
With reference to the fifth or sixth possible implementation manner of the first aspect, in a seventh possible implementation manner of the first aspect, the method further includes storing current state information after generating the pseudo code.
With reference to the seventh possible implementation manner of the first aspect, in an eighth possible implementation manner of the first aspect, the saving the current state information includes: after the code fetching of the current channel is completed, the current states of the shift registers of the two linear sequences G1 and G2 and the pseudo code count are stored in a specified memory, and the next channel is waited for code fetching.
With reference to the seventh possible implementation manner of the first aspect, in a ninth possible implementation manner of the first aspect, the saving the current state information includes: and after the code fetching of the current channel is finished, storing the address count, the inserting code count and the pseudo code count of the two Legendre sequences into a specified memory, and waiting for the code fetching of the next channel.
Drawings
FIG. 1 is a block diagram of a system framework for pseudo code generation for satellite navigation according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart of a method for generating generic satellite navigation pseudo codes according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a Golden code generation method according to an embodiment of the present application;
fig. 4 is a schematic diagram of a WEIL code generation method according to an embodiment of the present disclosure.
Detailed Description
The present invention will be described with reference to the accompanying drawings and embodiments.
The satellite navigation pseudo code generation method in the application mainly adopts the following system framework, referring to fig. 1, wherein the system framework comprises a pseudo code generation module, a configuration module, an expansion interface and a multi-channel interface.
The main function of the configuration module is to complete the working mode of the pseudo code generator through the configuration register. Configuring registers includes selecting a pseudo-code type, manner of use (exclusive or round robin), generation, initial phase, pseudo-code length, generator polynomial, mask configuration, and the like.
The pseudo code generating module has the main function of generating corresponding pseudo codes under the drive of code fetching signals according to specific parameters of the configuration module.
The main function of the multi-channel interface module is to store some key temporary variables in the generation and use processes of pseudo codes according to the requirement of multi-channel time division multiplexing, thereby ensuring the independence and continuity of code fetching of each channel. The main work flow of the pseudo code generation module is as follows: receiving a pseudo code request, reading in historical information according to a channel number, generating a pseudo code based on the historical information and parameter configuration, and storing the current state after the pseudo code request is completed.
Fig. 2 is a schematic flowchart of a method for generating a generic satellite navigation pseudo code according to an embodiment of the present disclosure, and referring to fig. 2, the method for generating a generic satellite navigation pseudo code according to the embodiment includes:
s101, parameter information for generating pseudo codes is configured, wherein the parameter information comprises Golden code parameter information and WEIL code parameter information.
For Golden code generation, the generation of multiple frequency point different Golden codes can be achieved by the following parameters. And after the configuration module acquires the parameters, storing the parameters under the appointed memory address according to the channel, and waiting for the pseudo code generation module to use.
For the WEIL code, only a Legendre sequence, namely 2.046kbit, is stored, and compared with the complete storage of the WEIL code, the storage resource is greatly reduced. And writing the calculated Legendre sequence into a designated storage RAM during initialization according to the frequency point, and waiting for the pseudo code generation module to read. And after the configuration module acquires the parameters, storing the parameters under the appointed memory address according to the channel, and waiting for the pseudo code generation module to use.
And S102, configuring a code generator matched with the type of the pseudo code according to the pseudo code request.
The present embodiment includes configuring the Golden code generator and the WEIL code generator.
The fitted Golden code generator comprises:
and reading corresponding parameters according to the serial number and the generated address of the code fetching channel.
The shift register initial values u32InitG1, u32InitG2 are arranged for two linear sequences G1 and G2.
The polynomial taps u32CoefG1, u32CoefG2 are configured for two linear sequences G1 and G2.
Mask values u32MaskG1 and u32MaskG2 were configured for the two linear sequences G1 and G2.
The two linear sequences G1 and G2 were configured with truncation lengths u32TrunckLen1, u32TrunckLen 2.
Reading in history information such as the states of two linear sequences G1 and G2 shift registers of a specified channel, pseudo code counting and the like.
After parameter configuration is completed, the relevant flag is set high to wait for code fetching signals.
Configuring the WEIL code generator includes:
and reading corresponding parameters according to the serial number and the generated address of the code fetching channel.
Sequence initial values u32PrInit _ a and u32PrInit _ b are configured for the two Legendre sequences.
The WEIL code sequence length u32WEILLen and the truncation length u32TruckLen are configured.
Reading the historical information such as address counting, inserting code counting, pseudo code counting and the like of two Legendre sequences of the specified channel.
After parameter configuration is completed, the relevant flag is set high to wait for code fetching signals.
And S103, generating pseudo codes of corresponding types by the code generator.
Fig. 3 is a schematic diagram of Golden code generation, referring to fig. 3, according to a pseudo code fetching signal and an enable switch, two linear sequences G1 and G2 are pushed to perform a shift operation based on an initial value of a configured shift register, and a chip count is started at the same time. When the chip count reaches the configured truncation length of G1 or G2, the G1 or G2 sequence is restored to the initial value accordingly. According to the configured polynomial tap, the corresponding BIT BITs in the two linear sequences G1 and G2 are selected to be xored and added as new input BITs. And according to the configured mask value, selecting corresponding BIT BITs in the two linear sequences G1 and G2 for exclusive OR addition to obtain a G1 sequence and a G2 sequence, and outputting a modulo-2 sum of the two sequences as a Golden code of the channel. And generating a pseudo code effective mark for facilitating the use of a later stage.
Fig. 4 is a schematic diagram of a WEIL code generation manner, and referring to fig. 4, two Legendre sequences are pushed to perform increment operation based on configured initial addresses according to a pseudo code fetching signal and an enable switch, and chip counting is started at the same time. And if the address reaches the address position of the inserted code, pausing the counting and the address increment, starting the inserted code, and recovering the normal counting and the address increment after the inserting operation of the inserted code is completed. If the chip count reaches the truncation length, the initial configuration is returned. Modulo 2 of the two Legendre sequences and the WEIL code as the channel. And generating a pseudo code effective mark for facilitating the use of a later stage.
And after Golden codes and WEIL codes are generated, current state information is stored. Specifically, for Golden codes, after the code fetching of the current channel is completed, the current states of the shift registers of the two linear sequences G1 and G2 and the pseudo code count are saved in a specified memory, and the next channel is waited for code fetching. For the WEIL code, after the code fetching of the current channel is finished, the address count, the inserting code count and the pseudo code count of the two Legendre sequences are stored in a specified memory, and the next channel is waited for code fetching.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Of course, the above description is not limited to the above examples, and technical features that are not described in this application may be implemented by or using the prior art, and are not described herein again; the above embodiments and drawings are only for illustrating the technical solutions of the present application and not for limiting the present application, and the present application is only described in detail with reference to the preferred embodiments instead, it should be understood by those skilled in the art that changes, modifications, additions or substitutions within the spirit and scope of the present application may be made by those skilled in the art without departing from the spirit of the present application, and the scope of the claims of the present application should also be covered.
Claims (10)
1. A method for generating pseudo codes of general satellite navigation is characterized in that the method comprises the following steps:
configuring parameter information for generating pseudo codes, wherein the parameter information comprises Golden code parameter information and WEIL code parameter information;
configuring a code generator matched with the type of the pseudo code according to the pseudo code request;
generating, by the code generator, pseudo codes of corresponding types.
2. The method according to claim 1, wherein the configuring parameter information of the pseudo code comprises: and after the parameters are obtained, storing the parameters under the appointed memory address according to the channel, and waiting for the generation and the use of the pseudo code.
3. The method for generating generic satellite navigation pseudo-codes according to claim 2, characterized in that for the WEIL code, only the Legendre sequence is stored, and the calculated Legendre sequence is written into the designated memory RAM at initialization.
4. The method for generating generic satellite navigation pseudo-codes according to claim 2, wherein configuring a Golden code generator, said configuring a code generator matching a pseudo-code type according to a pseudo-code request, comprises:
reading corresponding parameters according to the serial number and the generated address of the code fetching channel;
the two linear sequences G1 and G2 are provided with initial shift register values u32InitG1 and u32InitG 2;
configuring polynomial taps u32CoefG1, u32CoefG2 for two linear sequences G1 and G2;
configuring mask values u32MaskG1 and u32MaskG2 for two linear sequences G1 and G2;
configuring truncation lengths u32TrunckLen1 and u32TrunckLen2 for two linear sequences G1 and G2;
reading in history information such as states of two linear sequences G1 and G2 shift registers of a specified channel, pseudo code counting and the like;
after parameter configuration is completed, the relevant flag is set high to wait for code fetching signals.
5. The method of claim 3, wherein configuring the WEIL code generator, said configuring the code generator matching the pseudo code type according to the pseudo code request, comprises:
reading corresponding parameters according to the serial number and the generated address of the code fetching channel;
configuring sequence initial values u32PrInit _ a and u32PrInit _ b for the two Legendre sequences;
configuring a WEIL code sequence length u32WEILLen and a truncation length u32 TruckLen;
reading in historical information such as address counting, inserting code counting, pseudo code counting and the like of two Legendre sequences of a specified channel;
after parameter configuration is completed, the relevant flag is set high to wait for code fetching signals.
6. The method for generating generic satellite navigation pseudo-code according to claim 4, wherein generating pseudo-code of corresponding type by the code generator comprises:
according to the pseudo code fetching signal and the enabling switch, two linear sequences G1 and G2 are pushed to carry out shifting operation based on the configured initial value of the shift register, and chip counting is started at the same time;
when the chip count reaches the configuration truncation length of G1 or G2, restoring the G1 or G2 sequence to the initial value correspondingly;
according to the configured polynomial tap, selecting the exclusive OR addition of the corresponding BIT BITs in the two linear sequences G1 and G2 as new input BITs;
according to the configured mask value, corresponding BIT BITs in two linear sequences G1 and G2 are selected to be subjected to exclusive OR addition to obtain a G1 sequence and a G2 sequence to be output, and then the modulo-2 sum of the two sequences is used as the Golden code of the channel to be output;
and generating a pseudo code effective mark for facilitating the use of a later stage.
7. The method for generating generic satellite navigation pseudo-code according to claim 5, wherein generating pseudo-code of corresponding type by the code generator comprises:
pushing the two Legendre sequences to perform incremental operation based on the configured initial address according to the pseudo code fetching signal and the enabling switch, and starting chip counting at the same time;
if the address reaches the address position of the inserted code, pausing counting and address increment, starting the inserted code, and recovering normal counting and address increment after the insertion operation of the inserted code is completed;
if the chip count reaches the truncation length, returning to the initial configuration;
modulo 2 of two Legendre sequences and a WEIL code as the channel;
and generating a pseudo code effective mark for facilitating the use of a later stage.
8. The method of claim 6 or 7, further comprising saving current state information after generating the pseudo code.
9. The method of claim 8, wherein the saving current state information comprises: after the code fetching of the current channel is completed, the current states of the shift registers of the two linear sequences G1 and G2 and the pseudo code count are stored in a specified memory, and the next channel is waited for code fetching.
10. The method of claim 8, wherein the saving current state information comprises: and after the code fetching of the current channel is finished, storing the address count, the inserting code count and the pseudo code count of the two Legendre sequences into a specified memory, and waiting for the code fetching of the next channel.
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