CN104808221A - Weil code generation device and satellite navigation signal receiver - Google Patents
Weil code generation device and satellite navigation signal receiver Download PDFInfo
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- CN104808221A CN104808221A CN201410043706.6A CN201410043706A CN104808221A CN 104808221 A CN104808221 A CN 104808221A CN 201410043706 A CN201410043706 A CN 201410043706A CN 104808221 A CN104808221 A CN 104808221A
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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
- 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 invention discloses a Weil code generation device and a satellite navigation signal receiver. The Weil code generation device comprises a storage device which stores Legendre sequences; an address indicating unit which indicates a first reading address and a second reading address of the Legendre sequence corresponding to each Weil code of the Weil codes to be generated; a plurality of cache groups, wherein each cache group comprises a first cache unit and a second cache unit, the first cache unit of each cache group sequentially reading the Legendre sequence from the storage device according to the first reading address of the Weil code corresponding to each cache group, and the second cache unit of each cache group sequentially reading the Legendre sequence from the storage device according to the second reading address of the Weil code corresponding to each cache group; and an arithmetic unit which carries out exclusive-or operation on data obtained by the first cache unit of each cache group of the plurality of cache groups and data obtained by the second cache unit of the cache group to generate a plurality of Weil codes in real time. Multichannel real-time Weil code generation is realized in a hardware manner.
Description
Technical field
The application belongs to satellite navigation signals range finding field, relates to Weil code generating apparatus and satellite navigation signals receiver.
Background technology
GPS (Global Position System) (Global Navigation Satellite Systems, GNSS) can complete many work such as location, navigation, time service, has become the important infrastructure supported national economy, safeguard national security.Satellite navigation needs to utilize ranging code to realize, and the ranging code finding good properties becomes the key of Design Navigation signal.
At present, the L1 signal of GPS adopts C/A code as ranging code, and C/A code belongs to Gold code.The length of Gold code is 2
n-1, but except 1023, all need brachymemma or increase to realize.But too much brachymemma or growth can have influence on the correlated performance of Gold code.Such as, the ranging code code length that GPS prepares the L1C signal come into operation is 10230, is 2 with code length
nthe Gold code of-1 falls far short, and is difficult to be realized by Gold code.
Weil code has good correlativity, and code length is prime number, can design the ranging code of specific code length.Such as, in order to design the GPSL1C signal that ranging code code length is 10230, the Weil code that length is 10223 can be generated, mend 7 numerals again and just can design prime number near length 10230, also can Mr. become length be 10243 code length, then remove 13 prime numbers just can designed near length 10230 wherein.These brachymemmas or increase less, the good correlativity of Weil code can be ensured.
Existing Weil code generally adopts Software Create.Such as, if need the Weil code length generated to be N, moving sequence value is w.When realizing, first define arrays L, and length is N, and all elements value is 0.Allow integer k circulate from 0 to N-1, calculate t=k^2mod N at every turn, then make L (t)=0.After circulation terminates, what store in L is exactly the Legendre sequence that length is N.Defining a length is again the array Wi of N.Allow integer k circulate from 0 to N-1, calculate Wi (k)=L (k) ⊕ L ((k+w) mod N) at every turn.So just, generated Weil code, be stored in array Wi.
As can be seen from the calculation process, the generation of Weil code needs to carry out loop computation, and after circulation all completes, just must can determine the numerical value of a certain ad-hoc location.But, in navigation signal receiver, in order to realize catching and following the tracks of of signal, need the ranging code using multiple passage in real time.Adopt software approach to generate the operand complexity of hyperchannel Weil code, catching and tracking velocity needs of satellite navigation signals cannot be met by the mode generated in real time.
So satellite navigation signals receiver uses the method for Weil code to be all first with the good Weil code of Software Create at present, Weil code generating ranging code again by obtaining, then in receivers the ranging code that software approach generates is stored in memory, read in real time from storer at every turn.But because satellite navigation needs a lot of group Weil code, a large amount of storage spaces can be consumed.Such as, the pilot tone of a GPSL1C signal and data respectively have 64 kinds, that is, need generate 64 kinds of Weil codes in advance and store this 64 kinds of corresponding ranging codes of Weil code in receivers.And a ranging code code length is 10230, so approximately need the memory space of about 1.3 million bit.In addition, if receiver receives the signal of M satellite simultaneously, then altogether need to export M passage, the most extreme situation is the ranging code that M passage all needs to answer with 1 Weil code sequence pair, such as, will export 20 tunnels simultaneously, i.e. M=20, then need the memory space of 26,000,000 bit.This hardware resource directly 64 kinds of Weil codes mode in storage chip that is stored in taken is more.Further, owing to usually not needing to use 64 kinds of Weil codes at M passage simultaneously, a large amount of storage space is therefore wasted.
Summary of the invention
The object of the application is to provide a kind of Weil code generating apparatus, is realized, can generate hyperchannel Weil code in real time, meet catching and following the tracks of needs of satellite navigation signals by hardware mode.
According to an aspect of the application, disclose a kind of Weil code generating apparatus, comprising: memory storage, store Legendre sequence; Address indicating member, to indicate in multiple Weil codes to be generated first of each Legendre sequence corresponding to Weil code to read second of address and Legendre sequence and reads address; Multiple buffer memory group, each buffer memory group comprises the first buffer unit and the second buffer unit, the the first buffer unit order from described memory storage reading each buffer memory group described in address according to first of the Weil code corresponding to each buffer memory group reads Legendre sequence, and the second buffer unit order from described memory storage reading each buffer memory group described in address according to second of the Weil code corresponding to each buffer memory group reads Legendre sequence; And arithmetical unit, the data that the data obtain the first buffer unit of each buffer memory group in multiple buffer memory group and the second buffer unit of this buffer memory group obtain carry out XOR, to generate multiple Weil code in real time.
According to another aspect of the application, disclose a kind of satellite navigation signals receiver, comprising: foregoing Weil code generating apparatus, receiver module, and processing module, described receiver module receives the multiple ranging codes sent by multi-satellite; Described Weil code generating apparatus generates multiple Weil code in real time; Multiple Weil codes that processing module generates in real time according to described Weil code generating apparatus obtain local ranging code, and local ranging code and the ranging code received are compared, and complete satellite ranging, location and/or navigation.
Accompanying drawing explanation
Fig. 1 shows the Weil code generating apparatus of a kind of embodiment according to the application.
Fig. 2 shows the Weil code generating apparatus of the another kind of embodiment according to the application.
Fig. 3 shows the Weil code generating apparatus of the another kind of embodiment according to the application.
Fig. 4 shows the satellite navigation signals receiver of a kind of embodiment according to the application.
Fig. 5 shows the satellite navigation signals receiver of the another kind of embodiment according to the application.
Embodiment
With reference to the accompanying drawings the embodiment of the application is described in detail.For simplicity's sake, in the explanation of each embodiment of the application, same or similar parts employ same or analogous Reference numeral.
Fig. 1 shows a kind of Weil code generating apparatus 10 according to the application.As shown in Figure 1, Weil code generating apparatus 10 comprises: memory storage 100, address indicating member 200, multiple buffer memory group 300, and arithmetical unit 400.
Legendre sequence is stored in memory storage 100.
Address indicating member 200 to indicate in Weil code to be generated first of each Legendre sequence corresponding to Weil code to read address and second and reads address.Such as, if need the Weil code generating M passage in real time, then address register 200 indicates first of the Legendre sequence corresponding to Weil code of each passage in M passage to read address and second and reads address.
Multiple buffer memory group 300, each buffer memory group comprises the first buffer unit 310 and the second buffer unit 320.Each buffer memory group corresponds to a Weil code.First buffer unit of each buffer memory group reads address order from memory storage 100 according to first of the Legendre sequence of Weil code corresponding to this buffer memory group and reads Legendre sequence, and the second buffer unit reads address order from memory storage 100 according to second of the Legendre sequence of Weil code corresponding to this buffer memory group and reads Legendre sequence.
The data that second buffer unit of the data that the first buffer unit of each buffer memory group in multiple buffer memory group obtains by arithmetical unit 400 and this buffer memory group obtains carry out XOR, to generate the Weil code of multiple passage in real time.
By the way, utilize memory storage, the hardware devices such as buffer unit, the Weil code of multiple passage can be generated in real time.And arithmetical unit 400 step-by-step (bit) can obtain data and to go forward side by side row operation, to generate each in Weil code in real time from buffer unit.The hardware generating mode of this Weil code avoids loop computation, can obtain the current value of Weil code in real time, and without the need to the numerical value of a certain ad-hoc location just can be determined after circulation all completes.
Fig. 2 shows the Weil code generating apparatus of the another kind of embodiment according to the application.As shown in Figure 2, memory storage 100 may further include first memory 110 and second memory 120.Wherein, storer such as can adopt the modes such as ROM or RAM to realize.All Legendre sequence is stored in first memory 110 and second memory 120.Like this, indicated by address register 200 first reads the reading address that address is the Legendre sequence stored in first memory 110, and second indicated by address register 200 reads the reading address that address is the Legendre sequence stored in second memory 120.Be appreciated that, generation due to Weil code needs two Legendre sequences (reading address spacing) in a distance carry out computing and obtain, these two Legendre sequences are stored in different storeies, multiple buffer memory group 300 can read Legendre sequence respectively from two storeies, improves the efficiency generating Weil code.
According to a kind of embodiment, address indicating member 200 comprises multiple address register 200-1 ... 200-M.Each address register indicates first of the Legendre sequence corresponding to a Weil code to read address and second and reads address.Wherein, the described first spacing read between address and the second reading address determines the pattern of generated Weil code.
According to a kind of embodiment, the quantity of buffer memory group 300 is identical with the quantity of Weil code to be generated.Such as, when needing the Weil code generating M passage in real time, then need M buffer memory group, each buffer memory group comprises the first buffer unit 310-1 ... 310-M and the second buffer unit 320-1 ... 320-M.According to a kind of embodiment, the first buffer unit and second buffer unit of each buffer memory group are Buffer buffer.Such as, the Buffer buffer of 1bit, or the Buffer buffer of any bit.One Buffer buffer 310 of each buffer memory group can read address order from first memory 110 according to first of the corresponding Weil code of this buffer memory group and read Legendre sequence, and the 2nd Buffer buffer 320 of this buffer memory group can also read address order from second memory 120 according to second of the corresponding Weil code of this buffer memory group and read Legendre sequence.
Like this, the data of the data of a Buffer buffer institute buffer memory of multiple buffer memory group and the 2nd Buffer buffer institute buffer memory can be carried out computing, to generate multiple Weil code in real time by arithmetical unit 400.Such as, arithmetical unit 400 can comprise multiple NOR gate circuit 400-1 ... 400-M.According to a kind of embodiment, the data of NOR gate circuit 400-1 to the data of Buffer buffer 310-1 institute buffer memory and Buffer buffer 320-1 institute buffer memory carry out XOR, obtain first passage Weil code Weil1.
Correspondingly, the data of NOR gate circuit 400-M to the data of Buffer buffer 310-M institute buffer memory and Buffer buffer 320-M institute buffer memory carry out XOR, obtain M passage Weil code WeilM.
Fig. 3 shows the Weil code generating apparatus of the another kind of embodiment according to the application.As shown in Figure 3, the first buffer unit 310 of each buffer memory group comprise buffer 311, buffer 312 and selector switch 313, second buffer unit 320 comprise buffer 321, buffer 322 and selector switch 323.
Legendre sequence is sequentially read in an alternating manner in the first reading address that the buffer 311 of the first buffer unit 310 and buffer 312 indicate according to address indicating member 200 from first memory 110.Selector switch 313 selects the data in respective cache device to be supplied to arithmetical unit 400 according to the over-over mode of buffer 311 and buffer 312.Legendre sequence is sequentially read in an alternating manner in the second reading address that the buffer 321 of the second buffer unit 320 and buffer 322 indicate according to address indicating member 200 from second memory 120.Selector switch 323 selects the data in respective cache device to be supplied to arithmetical unit 400 according to the over-over mode of buffer 321 and buffer 322.
According to a kind of embodiment, buffer 311,312,321 and 322 is N bit buffer, N be more than or equal to 2 integer.Like this, by buffer 331 and buffer 332 and the ping-pong buffers between buffer 341 and buffer 342, can from storer read data by data cached generation Weil code, these two processes are carried out, to improve formation efficiency simultaneously.
Such as, for the buffer memory group corresponding to first passage Weil code, work in the following way.First, first reading address from storer 110 order of buffer 311-1 indicated by address register 200-1 reads the Legendre sequence of N bit, the Legendre sequence of the second reading address of buffer 321-1 indicated by address register 200-1 order reading N bit from storer 120.Then buffer memory group repeats with under type:
Selector switch 313-1 selects the data be stored in buffer 311-1 to be supplied to arithmetical unit 400-1.Meanwhile, the address of buffer 312-1 indicated by address register 200-1, continues from storer 110, reads the Legendre sequence of N bit.Similarly, selector switch 323-1 selects the data be stored in buffer 321-1 to be supplied to arithmetical unit 400-1.Second reading address from storer 120 order of buffer 322-1 indicated by address register 200-1 reads the Legendre sequence of N bit.
When after the data bit sky in buffer 311-1, selector switch 313-1 selects the data be stored in buffer 312-1 to be supplied to arithmetical unit 400-1.Meanwhile, buffer 311-1 reads the Legendre sequence of N bit from storer 110.Similarly, when after the data bit sky in buffer 321-1, selector switch 323-1 selects the data be stored in buffer 322-1 to be supplied to arithmetical unit 400-1.Meanwhile, buffer 321-1 reads the Legendre sequence of N bit from storer 120.
After this, the first buffer unit of buffer memory group and the second buffer unit will repeat above-mentioned alternately reading manner.
Arithmetical unit 400-1 by from selector switch 313-1 data with carry out XOR from the data in selector switch 323-1, obtain first passage Weil code Weil1.
Although be appreciated that the mode that disclosed and generate multiple Weil code in real time, Weil code generating apparatus disclosed in the present application also can be used for generating a Weil code in real time.Such as, the Weil code Weil1 of first passage can only be generated.
Disclosed herein as well is a kind of satellite navigation signals receiver comprising aforementioned Weil code generating apparatus.
Fig. 4 shows the schematic diagram of the navigation signal receiver of a kind of embodiment according to the application.As shown in Figure 4, navigation signal receiver 1 can comprise the Weil code generating apparatus 10 as aforementioned arbitrary embodiment, receiver module 20, and processing module 30.Receiver module 20 is for receiving the multiple ranging codes sent by multi-satellite.Weil code generating apparatus 10 generates multiple Weil code in real time.Multiple Weil codes that processing module 30 generates in real time according to Weil code generating apparatus obtain local ranging code, and local ranging code and the ranging code received are compared, and complete acquiring satellite, range finding, location and/or navigation.
Fig. 5 shows the schematic diagram of the navigation signal receiver of the another kind of embodiment according to the application.As shown in Figure 5, processing module 30 comprises ranging code generation module 31 further, trapping module 32 and tracking module 33.After receiver module 20 receives the multiple ranging codes sent by multi-satellite, Weil code generating apparatus 10 generates the Weil code of various pattern, catches for navigation signal.Here, the Weil code of various pattern can be generated by Weil code generating apparatus 10 simultaneously, also can be generated respectively by Weil code generating apparatus 10, as long as the multiple ranging codes received that can achieve a butt joint carry out catching.
The Weil code of the various patterns that ranging code generation module 31 generates according to Weil code generating apparatus 10 generates corresponding local ranging code.Such as, ranging code generation module 31 can generate local ranging code by the mode of insertion or truncated data in Weil code.
The local ranging code of various pattern and the ranging code received are compared by trapping module 32 respectively, determine the pattern of the multiple ranging codes received.Such as, generated various local ranging code and the ranging code received are carried out related operation by trapping module, determine the ranging code pattern received according to operation result.
Weil code generating apparatus 10 generate in real time to determine multiple Weil codes that multiple ranging code patterns of receiving are corresponding.Such as, according to determine the ranging code pattern that receives, determine the pattern of corresponding multiple Weil code, Weil code generating apparatus 10 generates multiple Weil code in real time according to determined multiple Weil code pattern.
Multiple Weil codes that ranging code generation module 31 generates according to Weil code generating apparatus 10 generate corresponding multiple local ranging code.
Range finder module 32 completes satellite ranging, location and/or navigation according to generated multiple local ranging code and received multiple ranging codes.
Be appreciated that, thisly realize at receiver the mode that Weil code generates in real time by hardware device, ensure that the formation speed simultaneously generating M passage Weil code, make the formation speed of local ranging code can be greater than the speed receiving navigational range code, to guarantee to provide navigation results in real time, and be unlikely to produce data congestion and delayed, cause operational fault or mistake.
Such as, when Weil code generating apparatus 10 adopts implementation as shown in Figure 2, demand fulfillment requirement
wherein, f
sbe the data read clock frequency of Weil code generating apparatus 10, that is, reading a secondary data required time is
f
cbe the code output clock frequency that satellite sends ranging code, that is, receiver module 20 from the time of satellite reception ranging code is
like this, namely the time generated needed for multiple Weil code is less than or equal to receiver module 20 receives multiple ranging code time from multi-satellite in real time to meet Weil code generating apparatus 10, thus ensure that receiver is in guidance operation, navigation results can be provided in real time, and be unlikely to produce data congestion and delayed, to cause operational fault or mistake
Such as, when Weil code generating apparatus 10 adopts implementation as shown in Figure 3, owing to have employed the mode of soldier's pang buffer memory, it is one group with two buffer memorys, when fetching data from one of them cache read, preserve data to another buffer memory, in order to using after a while, thus the data avoided in whole buffer memory are finished simultaneously, producing queues up reads the jam of data from memory storage 100.Like this, multiple buffer memory can read from the Legendre sequence be stored in different ROM (read-only memory) respectively and store data, thus saves the time generated needed for Weil code.And meet inequality
wherein, parameter M, f
sand f
cimplication identical with above description, N represents that buffer memory is N bit buffer.Like this, can according to inequality condition
determine the quantity of N, thus select the type of buffer further.
According to above-mentioned embodiment, the navigation signal receiver that the application provides can when receiving the ranging code that satellite sends, Weil code is generated in real time in this locality, thus generate local ranging code in real time, compare for the ranging code received, and without the need to prestoring a large amount of Weil codes or local ranging code in receivers, thus greatly save hardware resource.For small-sized, micro-receiver equipment or hand receiver equipment, its size wishes to design very little, and the saving of hardware resource also contributes to miniaturization or the microminiaturization of its volume.
Be described with reference to the exemplary embodiment of accompanying drawing to the application above.Those skilled in the art should understand that; above-mentioned embodiment is only used to the object that illustrates and the example of lifting; instead of be used for limiting; the any amendment done under all instructions in the application and claims, equivalently to replace, all should be included in and this application claims in the scope of protection.
Claims (10)
1. a Weil code generating apparatus, comprising:
Memory storage, stores Legendre sequence;
Address indicating member, to indicate in Weil code to be generated first of each Legendre sequence corresponding to Weil code to read second of address and Legendre sequence and reads address;
Multiple buffer memory group, each buffer memory group comprises the first buffer unit and the second buffer unit, the the first buffer unit order from described memory storage reading each buffer memory group described in address according to first of the Weil code corresponding to each buffer memory group reads Legendre sequence, and the second buffer unit order from described memory storage reading each buffer memory group described in address according to second of the Weil code corresponding to each buffer memory group reads Legendre sequence; And
Arithmetical unit, the data that the data obtain the first buffer unit of each buffer memory group in multiple buffer memory group and the second buffer unit of this buffer memory group obtain carry out XOR, to generate multiple Weil code in real time.
2. device as claimed in claim 1, wherein, described memory storage comprises first memory and second memory, and described first memory and second memory all store Legendre sequence,
The reading address that address is Legendre sequence in described first memory is read in first of described address register instruction, and the reading address that address is Legendre sequence in described second memory is read in second of described address register instruction.
3. device as claimed in claim 1 or 2, wherein, described address indicating member comprises multiple address register, and each address register indicates first of the Legendre sequence in multiple Weil codes to be generated corresponding to a Weil code to read address and second and reads address.
4. device as claimed in claim 1 or 2, wherein, described arithmetical unit comprises multiple NOR gate circuit, the data that second buffer unit of the data that the first buffer unit of a buffer memory group obtains by each NOR gate circuit and this buffer memory group obtains carry out XOR, to generate the Weil code corresponding to a described buffer memory group.
5. device as claimed in claim 1 or 2, wherein, the first buffer unit and second buffer unit of each buffer memory group of described multiple buffer memory group are buffer.
6. device as claimed in claim 1 or 2, wherein, first buffer unit of each buffer memory group of described multiple buffer memory group comprises the first buffer, the second buffer and first selector, according to the Weil code corresponding to each buffer memory group first reads address, first buffer of this buffer memory group and the second buffer sequentially read Legendre sequence in an alternating manner from described storer, the data that described first selector selects the data in respective cache device to obtain as the first buffer unit according to the over-over mode of described first buffer and described second buffer
Second buffer unit of each buffer memory group of described multiple buffer memory group comprises the 3rd buffer, the 4th buffer and second selector, according to the Weil code corresponding to each buffer memory group second reads address, 3rd buffer of this buffer memory group and the 4th buffer in an alternating manner from described storer order read Legendre sequence, the data that described second selector selects the data in respective cache device to obtain as the second buffer unit according to the over-over mode of described 3rd buffer and described 4th buffer.
7. generating apparatus as claimed in claim 6, wherein, described first buffer, the second buffer, the 3rd buffer, the 4th buffer are N bit buffer, N be more than or equal to 2 integer.
8. one kind comprises the satellite navigation signals receiver of the Weil code generating apparatus as described in aforementioned arbitrary claim.
9. a satellite navigation signals receiver, comprising: the Weil code generating apparatus according to any one of claim 1-7, receiver module, and processing module,
Described receiver module receives the multiple ranging codes sent by multi-satellite;
Described Weil code generating apparatus generates multiple Weil code in real time; And
Multiple Weil codes that processing module generates in real time according to described Weil code generating apparatus obtain local ranging code, and local ranging code and the ranging code received are compared, and complete satellite ranging, location and/or navigation.
10. receiver as claimed in claim 9, wherein, processing module comprises ranging code generation module further, trapping module and tracking module,
After described receiver module receives the multiple ranging codes sent by multi-satellite, described Weil code generating apparatus generates the Weil code of various pattern;
The Weil code of the various patterns that described ranging code generation module generates according to described Weil code generating apparatus generates corresponding local ranging code;
The local ranging code of various pattern and the ranging code received are compared by described trapping module respectively, determine the pattern of the multiple ranging codes received;
Described Weil code generating apparatus generate in real time to determine multiple Weil codes that multiple ranging code patterns of receiving are corresponding;
Multiple Weil codes that described ranging code generation module generates according to described Weil code generating apparatus generate corresponding multiple local ranging code; And
Described range finder module completes satellite ranging, location and/or navigation according to generated multiple local ranging code and received multiple ranging codes.
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| CN113031026A (en) * | 2021-02-25 | 2021-06-25 | 湖南国科微电子股份有限公司 | Ranging code generation method, device, equipment and storage medium |
| CN113031026B (en) * | 2021-02-25 | 2024-03-19 | 湖南国科微电子股份有限公司 | Ranging code generation method, device, equipment and storage medium |
| CN113126127A (en) * | 2021-04-02 | 2021-07-16 | 中国电子科技集团公司第五十四研究所 | HDL (hardware description language) -based quick Weil code generation method |
| CN113691344A (en) * | 2021-10-25 | 2021-11-23 | 长沙海格北斗信息技术有限公司 | Multi-path Weil code generation method and device |
| CN113691344B (en) * | 2021-10-25 | 2021-12-28 | 长沙海格北斗信息技术有限公司 | Multi-path Weil code generation method and device |
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