CN115407373A - Weil code generation method, computer storage medium and terminal - Google Patents
Weil code generation method, computer storage medium and terminal Download PDFInfo
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- G—PHYSICS
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- 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
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- 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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Abstract
Disclosed herein are a Weil code generation method, a computer storage medium and a terminal, including: storing Legendre sequences and Legendre sequence related data; generating a Weil code parameter linked list for signal frequency points supported by a receiver and available channels contained in each type of signal frequency points according to Legendre sequence related data and storage positions of Legendre sequences; generating Weil codes of the used channels according to the Legendre sequence and a Weil code parameter linked list of the available channels; the Legendre sequences are stored according to different signal frequency points; the used channel is an available channel when a satellite is acquired; legendre sequence related data is related data for determining the legendre sequence that generates the Weil code. According to the embodiment of the invention, the Weil code parameter linked list of the available channel is generated according to the separately stored Legendre sequence and Legendre sequence related data, and the Weil code of the used channel is generated according to the Legendre sequence and the generated Weil code parameter linked list, so that the occupation of hardware storage resources of a Weil code system is reduced.
Description
Technical Field
The present disclosure relates to, but not limited to, satellite navigation technologies, and more particularly, to a method for generating Weil codes, a computer storage medium, and a terminal.
Background
The satellite navigation system adopts Code Division Multiple Access (CDMA) to separate different transmission channels so as to distinguish satellites with different frequency points, and the ranging code is used as the basic component of the CDMA, and the relevant performance of the ranging code is an important consideration index in the design of satellite navigation signals. The Weil code uses Legendre sequences based on a quadratic residue theory, and the two columns of Legendre sequences are subjected to XOR processing to form a pseudo-random code with flexible selectable sequence length, so that the Weil code has good correlation performance. Therefore, the Weil code is used for signals of some satellite navigation systems, such as the L1C signal of the Global Positioning System (GPS) (public service signal in the satellite navigation system) and the B1C signal of beidou No. three (public service signal in the satellite navigation system).
The Weil code generation method commonly used in the related art includes: generating Weil codes of pilot frequency/data branches of each satellite of each frequency point in advance through software, and storing the Weil codes in a memory; and the satellite at each frequency point reads the corresponding Weil code from the memory in real time. However, in order to meet the requirements of different frequency points, different satellites and different channels, the satellite navigation receiver needs to traverse all stored Weil codes, which consumes a large amount of storage space of a chip; for example, there are 63 pilot frequency and data branches of the L1C signal of the GPS, 63 data codes and pilot frequency codes of the beidou No. three B1C signal, and in addition, the Weil code period is long, and the code period length is 10230 bits (bit). Because the working principle of the Weil code generator of the L1C signal of the GPS and the Beidou No. three B1C signal is different, the L1C signal of the GPS is a Weil code sequence with 10230bit period formed by inserting a 7-bit fixed sequence into a sequence with the length of 10223 bit; the Beidou No. three B1C signal is a Weil code sequence with a 10230bit period formed by truncation of a sequence with a length of 10243 bits, so that a L1C signal of a GPS and a Weil code of the Beidou No. three B1C signal need to be stored at the same time under a normal condition, a storage space of nearly 3 megabits (Mbit) is required for storing the L1C signal of the GPS and the Weil code of the Beidou No. three B1C signal, and more hardware storage resources are consumed.
How to reduce the occupation of the hardware storage resource of the satellite navigation system by the Weil code becomes a problem to be solved.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The embodiment of the invention provides a Weil code generation method, a computer storage medium and a terminal, which can reduce occupation of Weil codes on hardware storage resources of a satellite navigation system.
The embodiment of the invention provides a method for generating Weil codes, which comprises the following steps:
storing Legendre sequences and Legendre sequence related data;
generating a Weil code parameter linked list of each available channel according to the stored Legendre sequence related data and the storage position for storing Legendre sequences for more than one signal frequency point supported by a receiver and the available channel contained in each signal frequency point;
generating Weil codes of the used channels according to the stored Legendre sequences and the Weil code parameter linked lists of the available channels;
the Legendre sequences are respectively stored according to different signal frequency points; the used channel is an available channel when a tracking satellite is acquired; the legendre sequence related data is related data for determining a legendre sequence for generating Weil codes.
On the other hand, an embodiment of the present invention further provides a computer storage medium, where a computer program is stored in the computer storage medium, and when the computer program is executed by a processor, the method for generating the Weil code is implemented.
In another aspect, an embodiment of the present invention further provides a terminal, including: a memory and a processor, the memory having a computer program stored therein; wherein,
the processor is configured to execute the computer program in the memory;
the computer program, when executed by the processor, implements the method of generating Weil code as described above.
The technical scheme of the application includes: storing Legendre sequences and Legendre sequence related data; generating a Weil code parameter linked list for the signal frequency points supported by the receiver and the available channels contained in each type of signal frequency points according to the Legendre sequence related data and the storage positions of Legendre sequences; generating Weil codes of the used channels according to the Legendre sequence and a Weil code parameter linked list of the available channels; the Legendre sequences are stored according to different signal frequency points; the used channel is an available channel when a satellite is captured and tracked; the legendre sequence related data is related data for determining a legendre sequence for generating Weil codes. According to the embodiment of the invention, the Weil code parameter linked list of the available channel is generated according to the separately stored Legendre sequence and Legendre sequence related data, and the Weil code of the used channel is generated according to the Legendre sequence and the generated Weil code parameter linked list, so that the occupation of hardware storage resources of a Weil code system is reduced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and are not intended to limit the invention.
FIG. 1 is a flow chart of a method for generating Weil codes according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a device for generating Weil codes according to an exemplary application of the present invention;
FIG. 3 is a schematic diagram of a Weil code parameter linked list using exemplary signal frequency points according to the present invention;
FIG. 4 is a schematic diagram of a device for generating Weil codes according to the application example.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
Fig. 1 is a flowchart of a method for generating Weil code according to an embodiment of the present invention, as shown in fig. 1, including:
In an illustrative example, legendre sequences in embodiments of the present invention include: legendre sequences for B1C signals and/or legendre sequences for L1C signals.
It should be noted that the legendre sequence related data in the embodiment of the present invention is well known to those skilled in the art, and can be obtained from an existing manual.
In an illustrative example, the legendre sequence length of the inventive B1C signal is 10243 bits, ending with a 29-bit 0's complement;
the length of the L1C signal Legendre sequence is 10223bit, and the tail uses 0 complement bit of 15 bit;
the phase difference matrix of the B1C signal and the intercept point matrix of the B1C signal are stored in a 16-bit unsigned integer type; the pilot branch and the data branch respectively comprise a group of phase difference matrixes and intercept point matrixes;
the phase difference matrix of the L1C signal and the supplementary point matrix of the L1C signal are stored in a 16-bit unsigned integer type; the pilot frequency branch circuit and the data branch circuit respectively comprise a group of phase difference matrixes and intercept point matrixes;
in an illustrative example, the legendre sequence of embodiments of the present invention requires a maximum storage space of 12288 bits.
The signal frequency points included in the global navigation satellite system in the embodiment of the present invention are common knowledge of those skilled in the art, and can be divided according to frequency points and modulation modes, for example: the GPS system can be divided into frequency points such as L1, L1C, L2 and L5, and the BDS system can be divided into frequency points such as B1, B1C, B2A and B3; each signal frequency point comprises a plurality of different channels, each channel corresponds to one satellite, and each signal frequency point can correspond to satellites with different numbers.
In an illustrative example, in the embodiment of the invention, a plurality of signal frequency points perform acquisition and tracking of different signals in a time division multiplexing manner;
in an illustrative example, the signal frequency point in the embodiment of the present invention includes: the signal frequency point of the B1C signal and/or the signal frequency point of the L1C signal;
in an exemplary example, the legendre sequence is stored in a preset first storage area according to the signal frequency points, and the first storage area is a storage area in a ROM; in the first storage area, the embodiment of the invention stores corresponding Legendre sequences according to different frequency points of signals, and provides support for rapidly reading Legendre sequences.
In an exemplary embodiment, legendre sequence related data in the embodiment of the present invention is stored in a second predetermined storage area, where the second storage area is a storage area in a ROM; in the second storage area, the embodiment of the present invention stores corresponding legendre sequence related data according to the frequency point to which the embodiment of the present invention belongs, the pilot branch to which the embodiment of the present invention belongs, or the data branch, and in an exemplary embodiment, provides support for quickly reading legendre sequence related data.
When RAM storage intervals are divided for the acquisition tracking parameters of all frequency points, the embodiment of the invention presets the initial address (GroupAddr) for storing all signal frequency points; when a certain frequency point is determined to be L1C or B1C, a first address offset address (WeilOffset) is set, and the Legendre sequence of the corresponding frequency point is obtained from the first storage area of the ROM and stored at the first address offset address of the signal frequency point, so that the RAM of the Legendre sequence of the L1C or B1C stores the first address (LegCodeAddr = GroupAddr + WeilOffset).
Step 102: generating a Weil code parameter linked list of each available channel according to the stored Legendre sequence related data and the storage position for storing Legendre sequences for more than one signal frequency point supported by a receiver and the available channel contained in each signal frequency point;
wherein, the Weil code parameter linked list includes: a Weil code parameter linked list for the data leg (weildata link) and a Weil code parameter linked list for the pilot leg (WeilPilotLink).
In an exemplary embodiment, in the embodiment of the present invention, for more than one signal frequency point supported by a receiver and an available channel included in each signal frequency point, according to a satellite number corresponding to the available channel, legendre sequence related data of the available channel of the frequency point can be obtained from a ROM; if the signal is an L1C signal, the phase difference and the supplementary point of the data branch and the phase difference and the supplementary point of the pilot frequency branch exist; if the signal is a B1C signal, the phase difference and the interception point of a data branch and the phase difference and the supplement point of a pilot branch exist; generating a Weil code parameter linked list of each available channel according to Legendre sequence related data stored in a ROM and a storage position of a Legendre sequence stored in a RAM, and storing the Weil code parameter linked list in a capture tracking parameter RAM storage area of the frequency point;
according to the embodiment of the invention, by referring to the related technology, the on-orbit satellite and the corresponding satellite number of each signal frequency point are obtained from the official website of each navigation satellite system; and determining satellite numbers corresponding to the available channels for acquisition and tracking according to an acquisition and tracking algorithm.
In an exemplary embodiment, the Weil code parameter linked list of each available channel in the embodiment of the present invention includes the following information of the channel: the information about the type of the signal frequency point (TypeID), the phase difference value (Windex), the storage head address of the legendre sequence (LegCodeAddr), the code phase serial number (CodeCount), the cut-off point when the signal frequency point belongs to a B1C signal, or the complementary point when the signal frequency point belongs to an L1C signal (PIndex).
In an illustrative example, the signal type is 1bit, the phase difference value is 14bit, the storage head address of the legendre sequence is 32bit, the code phase sequence number is 16bit, the interception point when the signal frequency point is a B1C signal is 14bit, and the supplementary point when the signal frequency point is an L1C signal is 14bit;
it should be noted that, the code phase sequence number in the embodiment of the present invention is data determined at a moment according to an acquisition tracking algorithm; in other words, the code phase sequence numbers acquired at different times are different in the operation process of the acquisition and tracking algorithm.
In an exemplary example, the signal frequency point in the embodiment of the present invention is acquired and tracked by a plurality of available channels in a time-division multiplexing manner, and a phase difference value of an available channel of each satellite, an intercept point when the signal frequency point is a B1C signal, and a supplement point when the signal frequency point is an L1C signal are determined by a satellite number (PRN);
in an illustrative example, a TypeID of 0 in an embodiment of the present invention represents a B1C signal, and a TypeID of 1 represents an L1C signal;
in one illustrative example, an embodiment of the present invention determines the code phase sequence number of a channel based on an acquisition algorithm and a tracking loop algorithm: when initially entering capture, the initial code phase sequence number is 0; when tracking is carried out from the initial entrance, the code phase sequence number is given by an acquisition result; in the acquisition or tracking process, when the Weil code is required, the code phase serial number is updated according to an acquisition algorithm and a tracking loop algorithm in the related art.
In an illustrative example, the Weil code parameter linked list for each available channel in embodiments of the present invention includes the following information for that channel:
information of the signal type, the phase difference value, the storage head address and the code phase sequence number of the legendre sequence, and an interception point when the signal type is a B1C signal or a supplementary point when the signal type is an L1C signal.
In an illustrative example, legendre sequence related data in an embodiment of the invention includes the following information for an L1C signal: the phase difference matrix and the supplementary point matrix of the data branch, and the phase difference matrix and the supplementary point matrix of the pilot branch;
when the signal type of the channel is an L1C signal, the Weil code parameter linked list of the channel comprises a data branch linked list and a pilot branch linked list of the channel, wherein:
the data branch chain table includes: the type information of the L1C signal, the phase difference value of the channel obtained from the phase difference matrix of the data branch, the supplementary point of the channel obtained from the supplementary point matrix of the data branch, the storage head address of the Legendre sequence of the channel and the code phase sequence number of the channel;
the pilot branch chain table includes: the type information of the L1C signal, the phase difference value of the channel obtained from the phase difference matrix of the data branch, the supplementary point of the channel obtained from the supplementary point matrix of the data branch, the storage head address of the Legendre sequence of the channel, and the code phase sequence number of the channel.
In an illustrative example, legendre sequence related data in embodiments of the invention includes the following information for the B1C signal: the phase difference matrix and intercept point matrix of the data branch, the phase difference matrix and supplement point matrix of the pilot branch;
when the signal type of the channel is a B1C signal, the Weil code parameter linked list of the channel comprises a data branch linked list and a pilot frequency branch linked list of the channel, wherein:
the data branch chain table includes: the type information of the B1C signal, the phase difference value of the channel obtained from the phase difference matrix of the data branch, the intercept point of the channel obtained from the intercept point matrix of the data branch, the storage head address of the Legendre sequence of the channel and the code phase sequence number of the channel;
the pilot branch chain table includes: the type information of the B1C signal, the phase difference value of the channel obtained from the phase difference matrix of the data branch, the intercept point of the channel obtained from the intercept point matrix of the data branch, the storage head address of the Legendre sequence of the channel, and the code phase sequence number of the channel.
Step 103: generating Weil codes of the used channels according to the stored Legendre sequences and the generated Weil code parameter linked lists of the available channels;
the used channel is an available channel when the satellite is captured and tracked; legendre sequence related data is related data for determining the legendre sequence that generates the Weil code.
In an exemplary embodiment of the present invention, the channels used in the embodiment of the present invention operate in a time-division multiplexing manner when acquiring and tracking a satellite.
In one illustrative example, an embodiment of the present invention generates Weil codes for used channels, including:
step 201, determining a first bit value position and a second bit value position of a Legendre sequence of a used channel according to a Weil code parameter linked list of the used channel;
it should be noted that, in the embodiment of the present invention, weil codes of used channels are generated by legendre sequences of used channels.
Step 202, reading a first bit value and a second bit value used for generating Weil codes of the used channel from the Legendre sequence of the used channel according to the determined first bit value position and the determined second bit value position;
step 203, generating Weil codes of the used channels according to the first bit values and the second bit values;
the phase difference position between the second bit value position and the first bit value position is determined by the phase difference value of the used channel, namely the phase difference position between the second bit value position and the first bit value position is determined by the phase difference value in a data branch chain table or a pilot branch chain table of the used channel; when the signal type is a B1C signal, the position of a first bit value is determined according to a code phase sequence number and an interception point of a used channel; when the signal type is an L1C signal, the first bit value position is determined according to the code phase sequence number of the used channel and the supplementary point.
In an illustrative example, where the signal type of the used channel of embodiments of the present invention is a B1C signal, step 201 determines a first bit value position and a second bit value position of a legendre sequence of Weil codes that generated the used channel, including the first bit value position and the second bit value position by the formulas:
LegCount＝(CodeCount+(PIndex-1))％10243；
LegCountW＝(LegCount+Windex)％10243
wherein CodeCount represents the code phase serial number of the used channel; 10243 is Legendre sequence period of B1C signal; PIndex represents the intercept point of the data branch or the intercept point of the pilot branch of the used channel; when PIndex represents the interception point of the data branch of the used channel, legCount represents the first bit value position of the data branch of the used channel; when PIndex represents the interception point of the pilot branch of the used channel, legCount represents the first bit value position of the pilot branch of the used channel; windex represents the phase difference value of the data branch or the phase difference value of the pilot branch of the used channel; legCount represents a first bit value position of the data branch of the used channel and winddex represents a phase difference value of the data branch of the used channel, legCount w represents a second bit value position of the data branch of the used channel; legCount represents the first bit value position of the pilot branch of the used channel and winddex represents the phase difference value of the pilot branch of the used channel, legCount w represents the second bit value position of the pilot branch of the used channel and% represents the remainder.
In the embodiment of the invention, when the signal type of the used channel is a B1C signal, the interception sequence is started at the truncation point of adding the code phase serial number of the used channel into the B1C signal, and the intercepted sequence is subjected to residue-solving on the Legendre sequence period of the B1C signal to obtain a first bit value position; and after adding the phase difference value to the obtained first bit value position, performing remainder on the Legendre sequence period of the B1C signal to obtain a second bit value position.
In an exemplary embodiment, when the signal type of the used channel is an L1C signal, determining the first bit value position and the second bit value position of the legendre sequence of the used channel includes:
if the code phase sequence number of the used channel is smaller than the initial position of the insertion supplementing point, calculating a first bit value position and a second bit value position by the following formula:
LegCount＝CodeCount％10223；
LegCountW＝(LegCount+Windex)％10223；
if the code phase sequence number of the used channel is larger than the end position of the inserted supplementary point, calculating a first bit value position and a second bit value position by the following formula:
LegCount＝(CodeCount-7)％10223；
LegCountW＝(LegCount+Windex)％10223；
wherein CodeCount represents the code phase serial number of the used channel; 10223 is Legendre sequence period of L1C signal; legCount represents the first bit value position of the data branch of the channel being used; windex represents the phase difference value of the data branch or the phase difference value of the pilot branch of the used channel; legCount represents the first bit value position of the data branch of the used channel and Windex represents the phase difference value of the data branch of the used channel, legCount w represents the second bit value position of the data branch of the used channel; legCount represents the first bit value position of the pilot branch of the used channel and winddex represents the phase difference value of the pilot branch of the used channel, legCount w represents the second bit value position of the pilot branch of the used channel.
When the signal type of the used channel is an L1C signal, if the code phase sequence number of the used channel is smaller than the initial position of the insertion supplement point, the code phase sequence number of the used channel is processed to eliminate the influence of the Legendre sequence period, and a first bit value position is obtained; adding the first bit value position into the phase difference value, and then carrying out processing of eliminating the influence of the L1C signal Legendre sequence period to obtain a second bit value position; if the code phase sequence number of the used channel is larger than the tail end position of the inserted supplement point, subtracting the fixed sequence length from the code phase sequence number of the used channel, and carrying out processing when the influence of the Legendre sequence period of the L1C signal is eliminated to obtain a first bit value position; and adding the first bit value position into the phase difference value, and eliminating the influence of the Legendre sequence period of the L1C signal to obtain a second bit value position.
In an exemplary embodiment, before generating the Weil code of the used channel according to the first bit value and the second bit value, the method of the embodiment of the present invention further includes:
determining whether the code phase sequence number of the used channel is at the position of inserting the complementary point, wherein the position of inserting the complementary point comprises the position from the initial position of inserting the complementary point to the end position of inserting the complementary point (CodeCount E [ Pindex-1, pindex +5];
when the code phase sequence number of the used channel is at the position of the inserted supplementary point, inserting a preset fixed sequence into the legendre sequence corresponding to the used channel to obtain the legendre sequence used for determining the first bit value position and the second bit value position; the Legendre sequence corresponding to the used channel is obtained through the storage initial address of the Legendre sequence of the used channel in the Weil code parameter linked list;
and when the code phase sequence number of the used channel is not at the position of the inserted supplementary point, taking the Legendre sequence corresponding to the used channel as the Legendre sequence for determining the first bit value position and the second bit value position. The fixed sequence in the embodiment of the present invention is a fixed sequence in a standard protocol of a satellite navigation system, which is well known to those skilled in the art.
In an exemplary embodiment, before determining the first bit value position and the second bit value position of the legendre sequence of the used channel, the method in an embodiment of the present invention further includes:
step 301: judging whether the code phase sequence number of the used channel in the Weil code parameter linked list of the used channel is greater than or equal to the length of the Weil code sequence;
step 302, when the code phase sequence number of the used channel in the Weil code parameter linked list is greater than or equal to the length of the Weil code sequence, performing boundary processing on the code phase sequence number of the used channel so as to enable the code phase sequence number of the used channel to be in a correct range;
in one illustrative example, the boundary processing is performed on the code phase sequence number of the used channel, and comprises the following steps: and (4) dividing the code phase sequence number of the used channel by the length of the Weil code sequence, and then carrying out complementation, wherein the complementation result is used as the code phase sequence number of the used channel.
The following briefly illustrates, by way of a brief example, the reading, by step 202, of the first bit value and the second bit value of the Weil code used to generate the used channel from the legendre sequence of the used channel; in an illustrative example, the legendre sequence length of the B1C signal of the present invention is stored in units of 32-bit words, with a memory width and depth of 32 × 321; the length of the L1C signal Legendre sequence is 10223bit, the L1C signal Legendre sequence is stored by taking a 32-bit word as a unit, and the storage width and the storage depth are 32 multiplied by 320; the phase difference matrix of the B1C signal and the intercept point matrix of the B1C signal are stored in a 16-bit unsigned integer type, and the storage width and depth are 16 multiplied by 63; the phase difference matrix of the L1C signal and the supplementary point matrix of the L1C signal are stored in a 16-bit unsigned integer type, and the storage width and the storage depth are 16 multiplied by 63; in reading the legendre sequence with reference to the storage width and the depth, reading the first bit value and the second bit value may be performed according to the storage setting, and in an exemplary embodiment, in storing the legendre sequence with the storage width being a 32-bit word, the processing of obtaining the first bit value and the second bit value may include:
when the signal frequency point is a B1C signal, or the signal frequency point is an L1C signal but the code phase sequence number of the used channel is not at the position where the supplementary point is inserted (when the type id is 0, or the type id is 1 and CodeCount is in [0, PIndex-1) [ PIndex +6, 10230 ]), obtaining the position of the field where the first bit value is located: dividing the first bit value position by 32 for quotient (expression DwordAddr = LegCount/32); obtain the chip position of the first bit value in this field: the first bit value position is complemented by 32, and the expression is ChipAddr = LegCount%32;
acquiring the position of the field where the second bit value is located: the second bit value position is divided by 32 for quotient, with the expression wdwortaddr = LegCountW/32, and the chip position of the second bit value in this field is obtained: dividing the second bit value position by 32 to obtain the remainder, wherein the expression is WChipaddr = LegCountW%32;
according to the embodiment of the invention, a Legendre sequence can be accessed according to a storage first address LegCodeAddr of the Legendre sequence of a used channel, and a first bit value (Output) of the Legendre sequence of the used channel is obtained according to a position (DwordAddr) of a field where the first bit value is located and a chip position (ChipAddr) of the first bit value; the second bit value (WOutput) of the used channel is obtained from the position of the field (wdwortaddr) where the second bit value is located and the chip position (WChipAddr) of the second bit value.
In an illustrative example, a method in an embodiment of the present invention further includes: if the code phase sequence number of the used channel is at the insertion supplement point position, namely CodeCount ∈ [ Pindex-1, pindex +5], the fixed sequence is adopted as Weil code.
In an illustrative example, a method in an embodiment of the present invention further includes: when the signal frequency point is an L1C signal and the code phase serial number is at the position of the insertion supplement point (the expression is TypeID is 1 and CodeCount belongs to [ PIndex-1, PIndex +5 ]), obtaining a first bit value (Output) as follows: the value corresponding to the CodeCount- (Pindex-1) position of the fixed sequence; the second bit value (WOutput) is 0.
In an exemplary embodiment, step 203 of the present invention generates Weil code for the used channel, including: processing the first bit value (Output) and the second bit value (WOutput) by referring to a correlation technique to obtain Weil code (WeilOutput); in an exemplary embodiment, the embodiment of the present invention performs exclusive-or processing on the first bit value (Output) and the second bit value (WOutput) to obtain Weil code (WeilOutput)
According to the embodiment of the invention, weil codes of all used channels are generated one by one according to the preset sequence of the used channels until the Weil codes of all the used channels are generated.
The embodiment of the invention also provides a computer storage medium, wherein a computer program is stored in the computer storage medium, and when being executed by a processor, the computer program realizes the Weil code generation method.
An embodiment of the present invention further provides a terminal, including: a memory and a processor, the memory having stored therein a computer program; wherein,
the processor is configured to execute the computer program in the memory;
the computer program, when executed by a processor, implements the method of generating Weil code as described above.
The following brief description of the embodiments of the present invention is provided by way of application examples, which are only used for illustrating the embodiments of the present invention and are not used for limiting the scope of the present invention.
Application examples
In the application example, the L1C signal of the GPS system and the B1C signal of the BDS system are taken as examples to acquire the Weil code of each used channel of each signal frequency point. Fig. 2 is a schematic diagram of a Weil code generation apparatus according to an exemplary application of the present invention, as shown in fig. 2, a current system has M signal frequency points, where a signal frequency point M1 is an L1C signal, a signal frequency point M2 is a B1C signal, the signal frequency point M1 includes N available channels, and the signal frequency point M2 includes K available channels.
Fig. 3 is a schematic diagram of a Weil code parameter linked list of exemplary signal frequency points, and as shown in fig. 3, in the embodiment of the present invention, a data branch Weil code parameter linked list and a pilot branch Weil code parameter linked list of each available channel included in each signal frequency point are generated according to legendre sequence related data and address information for storing legendre sequences.
The Legendre sequence end of the L1C signal of the application example uses a 0 complement bit of 15 bits, the storage format uses a 32-bit unsigned integer type as a unit for storage, and the storage width and the depth of a ROM (read only memory) are 32 multiplied by 320; the phase difference matrix of the data branch and the phase difference matrix of the pilot branch of the L1C signal are respectively L1CDataW and L1CPilotW, the complementary point matrix of the data branch and the complementary point matrix of the pilot branch are respectively L1CDataP and L1CPilotP, the data branch and the pilot branch are stored in a 16-bit unsigned integer mode, and the storage width and the storage depth are 16 multiplied by 63;
the application example defines that a signal frequency point m1 stores a first address GroupAddr _ m1, a Legendre sequence is stored at an address of the first address offset WeilOffset, the Legendre sequence of the signal frequency point m1 stores a first address LegCodeAddr _ m1= GroupAddr _ m1+ WeilOffset, and a storage space is 10240 bits.
The signal frequency point m1 of the application example comprises N available channels, the satellite number corresponding to the nth available channel is PRNN, and the Weil code parameter linked lists are respectively as follows: data branch chain table weildarlink _ m1_ n and pilot branch chain table WeilPilotLink _ m1_ n.
The data branch chain table weildalink _ m1_ n contains the contents: the signal type TypeID _ Data _ n is 1, the Legendre sequence storage head address is LegCodeAddr _ m1, the phase difference value Windex _ Data _ n is the PRnn-1 element of the L1CDataW matrix, and the supplementary point Pindex _ Data _ n is the PRnn-1 element of the L1CDataP matrix.
The pilot branch chain table WeilPilotLink _ m1_ n contains the contents: the signal type TypeID _ Pilot _ n is 1, the Legendre sequence storage first address is LegCodeAddr _ m1, the phase difference value Windex _ Pilot _ n is the PRN-1 element of the L1CPilotW matrix, and the supplementary point Pindex _ Pilot _ n is the PRN-1 element of the L1CPilotP matrix.
According to an acquisition tracking strategy, determining code phase sequence numbers of available channels of a Weil code parameter linked list: when initially entering capture, the initial code phase sequence number is 0; when initially entering tracking, an initial code phase sequence number is given by an acquisition result; in the acquisition or tracking process, when the Weil code is required, the code phase serial number value is updated according to the acquisition algorithm and the tracking loop.
For the signal frequency point m2, the end of the legendre sequence of the B1C signal of this application example uses 0 complement bit of 29bit, the storage format uses 32bit word as unit for storage, and the storage width and depth of the ROM memory are 32 × 321; the phase difference matrixes of the data branch of the B1C signal and the pilot frequency branch of the B1C signal are respectively B1CDataW and B1CPilotW, the intercept matrix of the data branch and the intercept matrix of the pilot frequency branch are respectively B1CDataP and B1CPilotP, the data branch and the pilot frequency branch are stored in a 16-bit unsigned integer mode, and the storage width and the depth of a ROM are 16 multiplied by 63;
in the application example, a signal frequency point m2 stores a first address GroupAddr _ m2, a Legendre sequence is stored at an address with a first address offset WeilOffset, the signal frequency point m2 Legendre sequence stores a first address of LegCodeAddr _ m2= GroupAddr _ m2+ WeilOffset, and a storage space is 10272 bits.
The signal frequency point m2 of the application example comprises K available channels, the satellite number corresponding to the kth available channel is PRNK, and the Weil code parameter linked lists are respectively as follows: data branch chain table weildarlink _ m2_ k and pilot branch chain table WeilPilotLink _ m2_ k.
Data tributary linked list weildalink _ m2_ k contains the contents: the signal type TypeID _ Data _ k is 0, the Legendre sequence storage head address is LegCodeAddr _ m2, the phase difference value Windex _ Data _ k is the PRNK-1 element of the B1CDataW matrix, and the intercept point Pindex _ Data _ k is the PRNK-1 element of the B1CDataP matrix.
The pilot branch chain table WeilPilotLink _ m2_ k contains the contents: the signal type TypeID _ Pilot _ k is 0, the Legendre sequence storage first address is LegCodeAddr _ m2, the phase difference value Windex _ Pilot _ k is the PRNK-1 element of the B1CPilotW matrix, and the intercept point Pindex _ Pilot _ k is the PRNK-1 element of the B1CPilotP matrix.
According to an acquisition tracking strategy, determining code phase sequence numbers of available channels of a Weil code parameter linked list: when initially entering capture, the initial code phase sequence number is 0; when initially entering tracking, an initial code phase sequence number is given by an acquisition result; in the acquisition or tracking process, when the Weil code is required, the code phase serial number value is updated according to the acquisition algorithm and the tracking loop.
When the available channel n is used for capturing and tracking the satellite, the available channel n is updated to the used channel n; FIG. 4 is a schematic diagram of an apparatus for generating Weil code according to the present application example, as shown in FIG. 4, including: the device comprises a restarting unit, a positioning unit, a reading unit and an output unit; wherein,
when the code phase serial number CodeCount _ Data _ n of the used channel n (the nth available channel) contained in the signal frequency point m1 exceeds the length of the Weil code sequence, entering a restarting unit, and performing boundary processing on the code phase serial number of the used channel n by the restarting unit to remove the influence of a code period;
when CodeCount _ Data _ n is smaller than PIndex _ Data _ n-1, the expression of the first bit value position is: legCount _ Data _ n = CodeCount _ Data _ n%10223, and the expression for the second bit value position is: legCountW _ Data _ n = (LegCount _ Data _ n + Windex _ Data _ n)% 10223;
if CodeCount _ Data _ n > Pindex _ Data _ n +5, the expression of the first bit value position is LegCount _ Data _ n = (CodeCount _ Data _ n-7)% 10223; the expression for the second bit value position is: legCountW _ Data _ n = (LegCount _ Data _ n + Windex _ Data _ n)% 10223;
according to the first bit value position, the application example positioning unit determines a specific position for reading the first bit value by referring to the position of the field where the first bit value is located and the calculation method of the chip position of the first bit value according to the embodiment of the present invention; according to the second bit value position, the specific position for reading the second bit value is determined by referring to the position of the field where the second bit value is located and the calculation method of the chip position of the second bit value in the embodiment of the present invention.
Reading a legendre sequence of the specific position of the first bit value and a legendre sequence of the specific position of the second bit value by a reading unit according to the specific position of the first bit value and the specific position of the second bit value; the application example output unit outputs the Weil code of the used channel n after performing exclusive or processing on the read legendre sequence of the specific position of the first bit value and the legendre sequence of the specific position of the second bit value.
The application example saves hardware storage resources of the satellite navigation system; the system can simultaneously support the L1C signal of the GPS and the Beidou No. three B1C signal, and has universality; the device for generating Weil codes in the application example can support available channels of multiple signal frequency points in a time division multiplexing mode. The application example forms a Weil code parameter linked list of available channels contained in the B1C signal or the L1C signal; hardware storage resources are saved by only storing Legendre sequences corresponding to signal frequency points, phase difference values required by B1C signals, phase difference values required by interception points and L1C signals and supplement points.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
Claims (13)
1. A method for generating Weil codes comprises the following steps:
storing the Legendre sequence and Legendre sequence related data;
generating a Weil code parameter linked list of each available channel according to the stored Legendre sequence related data and the storage position for storing Legendre sequences for more than one signal frequency point supported by a receiver and the available channel contained in each signal frequency point;
generating Weil codes of the used channels according to the stored Legendre sequences and Weil code parameter linked lists of the available channels;
the Legendre sequences are respectively stored according to different signal frequency points; the used channel is an available channel when a tracking satellite is acquired; the legendre sequence related data is related data for determining a legendre sequence for generating Weil codes.
2. The method of generating as claimed in claim 1, wherein the Weil code parameter linked list of each available channel includes the following information of the channel:
information of a signal type, a phase difference value, a storage head address and a code phase sequence number of the legendre sequence, and an interception point when the signal type is a B1C signal or a supplementary point when the signal type is an L1C signal.
3. The method of claim 2, wherein the legendre sequence related data comprises the following information for an L1C signal: the phase difference matrix and the supplementary point matrix of the data branch, and the phase difference matrix and the supplementary point matrix of the pilot branch;
when the signal type of the channel is an L1C signal, the Weil code parameter linked list of the channel comprises a data branch linked list and a pilot frequency branch linked list of the channel, wherein:
the data branch chain table includes: the type information of the L1C signal, the phase difference value of the channel obtained from the phase difference matrix of the data branch, the supplementary point of the channel obtained from the supplementary point matrix of the data branch, the storage head address of the Legendre sequence of the channel, and the code phase sequence number of the channel;
the pilot branch chain table includes: the type information of the L1C signal, the phase difference value of the channel obtained from the phase difference matrix of the data branch, the supplementary point of the channel obtained from the supplementary point matrix of the data branch, the storage head address of the Legendre sequence of the channel, and the code phase sequence number of the channel.
4. The method of claim 2, wherein the legendre sequence related data includes the following information for a B1C signal: the phase difference matrix and intercept point matrix of the data branch, the phase difference matrix and supplement point matrix of the pilot branch;
when the signal type of the channel is a B1C signal, the Weil code parameter linked list of the channel comprises a data branch linked list and a pilot frequency branch linked list of the channel, wherein:
the data branch chain table includes: the type information of the B1C signal, the phase difference value of the channel obtained from the phase difference matrix of the data branch, the intercept point of the channel obtained from the intercept point matrix of the data branch, the storage head address of the Legendre sequence of the channel and the code phase sequence number of the channel;
the pilot branch chain table includes: the type information of the B1C signal, the phase difference value of the channel obtained from the phase difference matrix of the data branch, the intercept point of the channel obtained from the intercept point matrix of the data branch, the storage head address of the Legendre sequence of the channel, and the code phase sequence number of the channel.
5. The method of generating as claimed in claim 2, wherein said generating Weil code for the used channel comprises:
determining a first bit value position and a second bit value position of a Legendre sequence of the used channel according to a Weil code parameter linked list of the used channel;
reading a first bit value and a second bit value used for generating Weil codes of the used channel from the Legendre sequence of the used channel according to the first bit value position and the second bit value position;
generating Weil codes of the used channels according to the first bit values and the second bit values;
wherein the second bit value position differs from the first bit value position by a position determined by a phase difference value of the used channel; when the signal type is a B1C signal, the first bit value position is determined according to the code phase sequence number and the truncation point of the used channel; and when the signal type is an L1C signal, the first bit value position is determined according to the code phase sequence number and the supplementary point of the used channel.
6. The method of generating as claimed in claim 5, wherein when the signal type of the used channel is a B1C signal, said determining the first bit value position and the second bit value position of the Legendre sequence of the used channel comprises determining the first bit value position and the second bit value position by:
LegCount＝(CodeCount+(PIndex-1))％10243；
LegCountW＝(LegCount+Windex)％10243
wherein CodeCount represents the code phase serial number of the used channel; 10243 is Legendre sequence period of B1C signal; PIndex represents the intercept point of the data branch or the intercept point of the pilot branch of the used channel; when PIndex represents the interception point of the data branch of the used channel, legCount represents the first bit value position of the data branch of the used channel; when the Pindex represents the interception point of the pilot branch of the used channel, the LegCount represents the first bit value position of the pilot branch of the used channel; windex represents the phase difference value of the data branch or the phase difference value of the pilot branch of the used channel; legCount represents a first bit value position of the data branch of the used channel and winddex represents a phase difference value of the data branch of the used channel, legCount w represents a second bit value position of the data branch of the used channel; legCount represents the first bit value position of the pilot branch of the used channel and winddex represents the phase difference value of the pilot branch of the used channel, legCount w represents the second bit value position of the pilot branch of the used channel, and% represents the remainder.
7. The method according to claim 5, wherein when the signal type of the used channel is an L1C signal, the determining the first bit value position and the second bit value position of the legendre sequence of the used channel comprises:
if the code phase sequence number of the used channel is smaller than the initial position of the insertion supplementing point, calculating a first bit value position and a second bit value position by the following formula:
LegCount＝CodeCount％10223；
LegCountW＝(LegCount+Windex)％10223；
if the code phase sequence number of the used channel is larger than the end position of the inserted supplementary point, calculating a first bit value position and a second bit value position by the following formula:
LegCount＝(CodeCount-7)％10223；
LegCountW＝(LegCount+Windex)％10223；
wherein CodeCount represents the code phase serial number of the used channel; 10223 is Legendre sequence period of L1C signal; legCount represents the first bit value position of the data branch of the channel being used; windex represents the phase difference value of the data branch or the phase difference value of the pilot branch of the used channel; legCount represents the first bit value position of the data branch of the used channel and Windex represents the phase difference value of the data branch of the used channel, legCount w represents the second bit value position of the data branch of the used channel; legCount represents the first bit value position of the pilot branch of the used channel and Windex represents the phase difference value of the pilot branch of the used channel, legCount w represents the second bit value position of the pilot branch of the used channel.
8. The method of claim 7, wherein prior to generating Weil code for the used channel based on the first bit value and the second bit value, the method further comprises:
determining whether the code phase sequence number of the used channel is at a position where a supplemental point is inserted; wherein the position of inserting the supplemental point comprises from a start position of inserting the supplemental point to an end position of inserting the supplemental point;
when the code phase sequence number of the used channel is at the position of the inserted supplementary point, inserting a preset fixed sequence into a legendre sequence corresponding to the used channel to obtain a legendre sequence used for determining the first bit value position and the second bit value position; the Legendre sequence corresponding to the used channel is obtained through the storage head address of the Legendre sequence of the used channel in the Weil code parameter linked list;
and when the code phase sequence number of the used channel is not at the position of inserting a supplementary point, taking the legendre sequence corresponding to the used channel as the legendre sequence for determining the first bit value position and the second bit value position.
9. The generation method according to any of claims 5 to 7, characterized in that, before determining the first and second bit value positions of the legendre sequence of the used channel, the method further comprises:
judging whether the code phase sequence number of the used channel is larger than or equal to the length of the Weil code sequence in the Weil code parameter linked list of the used channel;
and when the code phase serial number of the used channel is greater than or equal to the length of the Weil code sequence, dividing the code phase serial number of the used channel by the length of the Weil code sequence to obtain a remainder, and taking the remainder as the code phase serial number of the used channel so as to perform boundary processing on the code phase serial number of the used channel.
10. The generation method according to claim 7 or 8, characterized in that the method further comprises:
and when the signal type of the used channel is an L1C signal, and the code phase serial number of the used channel is at the position of an insertion supplement point, adopting a fixed sequence as the Weil code.
11. The generation method according to any one of claims 1 to 8, wherein the storing of legendre sequences comprises:
and respectively storing the Legendre sequences into different areas of a Random Access Memory (RAM) according to different signal frequency points from software loaded with the Legendre sequences.
12. A computer storage medium having stored thereon a computer program which, when executed by a processor, implements the method of Weil code generation as claimed in any of claims 1-11.
13. A terminal, comprising: a memory and a processor, the memory having a computer program stored therein; wherein,
the processor is configured to execute the computer program in the memory;
the computer program, when executed by the processor, implements the method of Weil code generation as claimed in any of claims 1-11.
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