CN107957584A - A kind of real time multi-channel ranging code generating means and method - Google Patents
A kind of real time multi-channel ranging code generating means and method Download PDFInfo
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- CN107957584A CN107957584A CN201610903767.4A CN201610903767A CN107957584A CN 107957584 A CN107957584 A CN 107957584A CN 201610903767 A CN201610903767 A CN 201610903767A CN 107957584 A CN107957584 A CN 107957584A
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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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- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The present invention is a kind of real time multi-channel ranging code generating means and method, mainly include satellite PRN queues receiver, code generator state machine, code generator parameter register, gate, ranging code generator, splitter and data fifo end, for the present invention in the case of using only a ranging code generator, the hardware resource for solving the problems, such as to occur during tracking multi-satellite takes big, efficiency is low etc..
Description
Technical field
The present invention relates to field of satellite navigation, especially a kind of real time multi-channel ranging code generating means and method.
Technical background
GPS（Global Positioning System, global positioning system）In guidance, navigation, accurate measurement, precision
It is widely applied in terms of time service.In GPS applications, the ranging code of GPS L1C signals is an emphasis, because ranging code is only
One corresponds to satellite number, and the ranging code of pilot tone and data channel is based on ranging code structure, because different ranging sequence ropes
Draw w and sequence spreading insertion point position p is different from, it is possible to determine its uniqueness and asterisk ownership.General gps signal
Ranging code construction rule is as follows：First, the Legendre sequence L (t) (t=0 ~ 10222) of one 10223 are produced.The sequence
Row carry out exclusive or with shifting the Legendre sequences after w, obtain the Weil codes that code length is 10223, as shown in formula 1：
Wi (t, w)=L (t)+ L ((t+w) mod 10223), t=0 ~ 10222 [formula 1]
Then according to index value p, fixed sequence spreading (0 11010 0) is inserted into Weil codes, you can generation ranging
Code.
Because GPS receiver is in demodulation of satellite signal, it is necessary in locally generated corresponding ranging code with to satellite-signal
De-spread.When being positioned, it is necessary to track multi-satellite at the same time, thus also just need to produce the ranging of every satellite respectively
Code.Traditional method is the hardware that each tracking channel has 1 generation ranging code, and each produces the hardware of ranging code
The Legendre sequences of storage one 10223 are needed, when tracking satellite number is more, substantial amounts of hardware store money will be consumed
Source, thus cause efficiency low, and increase chip area.
The content of the invention
To solve the above-mentioned problems, the present invention provides a kind of real time multi-channel ranging code generating means and method, only
In the case of using a ranging code generator, the hardware resource for solving to occur during tracking multi-satellite takes big, efficiency is low etc.
Problem.
Technical scheme is as follows：A kind of real time multi-channel ranging code generating means, including satellite PRN queues connect
Receive device, code generator state machine, code generator parameter register, gate, ranging code generator, splitter and data fifo
End, the satellite PRN queues receiver are bi-directionally connected with code generator state machine, and the reception of satellite PRN queues receiver,
Satellite PRN is stored, and satellite PRN is numbered the i of i, i=1,2,3 ...；
The code generator state machine input terminal with gate, ranging code generator output and splitter respectively it is defeated
Enter end to be connected, and code generator state machine receives the PRN and numbering i of satellite PRN queues receiver transmission；
The output terminal of the code generator parameter register is connected with the input terminal of gate, and code generator parameter register
Device storage produces the required parameter of ranging code of all GPS L1C satellites at present；
The gate is connected with the input terminal of ranging code generator, and the code generator state machine transmission that gate receives
PRN, and according to the PRN given, go selection to receive needed for the ranging code of the satellite PRN of code generator parameter register output
The parameter wanted；
Input terminal of the output terminal of the ranging code generator respectively with splitter and code generator state machine is connected, and ranging
Code generator receive gate selection satellite PRN the required parameter of ranging code, and according to pass through algorithm to parameter
Ranging code is generated, then, the ready signals sent to code generator state machine；
The output terminal of the splitter is connected with the input terminal at data fifo end, and splitter receives the life of ranging code generator
Into ranging code and code generator state machine transmission satellite PRN numbering i；
The numbering i and ranging code of the satellite PRN of the input terminal received branch unit transmission at the data fifo end, and according to
The numbering i of PRN selects the output terminal output at corresponding data fifo end.
Further, present invention additionally comprises crystal resonator and phaselocked loop device, the input of the output terminal and phaselocked loop device of crystal resonator
End is connected, and crystal resonator produces reference clock and is transferred to phaselocked loop device；The output terminal of phaselocked loop device respectively with code generator parameter
Register, gate, ranging code generator, splitter and the output terminal at data fifo end are connected, and crystal resonator output
High frequency clock signal exports each device to more than.
Further, the number of the output terminal at the data fifo end is set according to the maximum of satellite queue,
The output terminal number numbering at data fifo end is n, n=1,2,3 ... n；And satellite PRN queues receiver to satellite PRN into
Capable numbering i and the output terminal numbering n at data fifo end are in correspondence with each other.
Further, present invention additionally comprises a kind of method of real time multi-channel ranging code generating means the described method includes with
Lower step：
S1. code generator state machine obtains satellite queue, and the sequencing being stored according to tracking satellite number is from the satellite
A satellite PRN and index i of the satellite number in queue is read in number queue；
S2. satellite PRN is sent to gate by code generator state machine, controls the gate to be gated with this；
S3. the required parameter of ranging code of selected satellite PRN is sent to ranging code generator by gate；
S4. ranging code generator is according to the parameter of the ranging code of satellite PRN, and combines corresponding algorithm generation ranging code, raw
Into after ranging code, ranging code generator sends ready signals and gives code generator state machine, and ranging code is sent to splitter；
S5. after code generator state machine receives the ready signals of ranging code generator transmission, at once satellite queue
Index i is sent to splitter；
S6. splitter chooses corresponding data output end, passes through FIFO numbers according to the index i of the satellite queue received
Ranging code is exported according to the output terminal at end.
Further, the input terminal at the data fifo end and the output terminal of splitter have n, and correspond, and n=
1,2,3,…n。
Further, the ranging code generator, splitter, n data fifo end can all be provided high frequency clock signal,
The purpose of increasing high frequency clock signal is the demand for making the generation speed of ranging code generator 12 cope with n satellite ranging code,
It is not in the loss of data.
Further, the high frequency clock signal is provided by crystal oscillator, and is conveyed to ranging code generator by phaselocked loop, is divided
Road device and n data fifo end.
Further, the splitter output ranging code to data fifo end input terminal during, can height
Frequency ranging code clock domain is transformed into 1.023M ranging code clock domains, and is enabled from data fifo end output ranging code and data；Cause
It is more than ranging code clock signal frequency for the frequency of the high frequency clock signal（1.023M）N times, so, this need turn
It can be exported after changing.
It is using the beneficial effect of above technical scheme：, can be with the case of using ranging code generating means
Track multi-satellite, for equipment before, reduces hardware resource and takes, improves work efficiency；Moreover, the present invention is using increasing
Add high frequency clock signal, so can both lift the generation speed of ranging code generator, cope with the need of n satellite ranging code
Ask, and can prevent existing loss of data；Meanwhile the present invention stores all satellite PRN codes by code generator parameter register
Parameter information so that the present invention can produce the ranging code of n kind satellites, and for relatively existing equipment, save a large amount of hard
Part resource.
Brief description of the drawings
Fig. 1 is the overall flow of the present invention.
The title of the corresponding component of digital or alphabetical representative in figure：11. gate, 12. ranging code generators, 13. points
Road device, 14. yards of generator state machines, 15. satellite PRN queue receivers, 16. yards of generator parameter registers, 17. lock phases
Ring device, 18. crystal resonators, 19. data fifo ends.
Specific embodiment
As shown in drawings, received signal is by taking GPS L1C satellites as an example in the present embodiment, a kind of real time multi-channel ranging code
Generating means, including satellite PRN queues receiver 15, code generator state machine 14, code generator parameter register 16, gating
Device 11, ranging code generator 12, splitter 13 and data fifo end 19, crystal resonator 18 and phaselocked loop device 17, satellite number
PRN queues receiver 15 is bi-directionally connected with code generator state machine 14, and satellite PRN queues receiver 15 receives, stores and defend
Asterisk PRN, and satellite PRN is numbered the i of i, i=1,2,3 ...；
Code generator state machine 14 input terminal with gate 11,12 output terminal of ranging code generator and splitter 13 respectively
Input terminal is connected, and code generator state machine 14 receives the PRN and numbering i of the transmission of satellite PRN queues receiver 15；
The output terminal of code generator parameter register 16 is connected with the input terminal of gate 11, and code generator parameter register
16 storages produce the required parameter of ranging code of all satellite PRN at present；
Gate 11 is connected with the input terminal of ranging code generator 12, and the code generator state machine 14 that gate 11 receives passes
Defeated PRN, and according to the PRN given, go selection to receive the ranging code of the satellite PRN of the output of code generator parameter register 16
Required parameter；
Input terminal of the output terminal of ranging code generator 12 respectively with splitter 13 and code generator state machine 14 is connected, and ranging
Code generator 12 receive gate selection satellite PRN the required parameter of ranging code, and according to pass through calculation to parameter
Method generates ranging code, then, the ready signals sent to code generator state machine；
The output terminal of splitter 13 is connected with the input terminal at data fifo end 19, and splitter 13 receives ranging code generator 12
The numbering i of the satellite PRN of ranging code and code generator state machine 14 transmission of generation；
The numbering i and ranging code for the satellite PRN that the input terminal received branch unit 13 at data fifo end 19 transmits, and according to PRN
Numbering i select the output terminal output at corresponding data fifo end 19.
The output terminal of crystal resonator 18 is connected with the input terminal of phaselocked loop device 17, and crystal resonator 18 produces reference clock and is transferred to
Phaselocked loop device 17；The output terminal of phaselocked loop device 17 respectively with code generator parameter register 16, gate 11, ranging code generator
12nd, splitter 13 and the output terminal at data fifo end 19 are connected, and the high frequency clock signal that crystal resonator 18 is exported export to
Each device above.
The number of the output terminal at data fifo end 19 is set according to the maximum of satellite queue number, data fifo end 19
Output terminal number numbering is n, n=1,2,3 ... n；And the numbering i that is carried out to satellite PRN of satellite PRN queues receiver 15 and
The output terminal numbering n at data fifo end 19 is in correspondence with each other.
It is described present invention additionally comprises a kind of method of the real time multi-channel ranging code generating means of GPS satellite navigation system
Method comprises the following steps：
S1. code generator state machine 14 obtains satellite queue, and is defended according to the sequencing that tracking satellite number is stored in from described
A satellite PRN and index i of the satellite number in queue is read in asterisk queue；
S2. satellite PRN is sent to gate 11 by code generator state machine 14, controls the gate 11 to be selected with this
It is logical；
S3. the required parameter of ranging code of selected satellite PRN is sent to ranging code generator 12 by gate 11；
S4. ranging code generator 12 is according to the parameter of the ranging code of satellite PRN, and combines corresponding algorithm generation ranging code,
After generating ranging code, ranging code generator 12 sends ready signals to code generator state machine 14, and ranging code is sent to point
Road device 13；
S5. after code generator state machine 14 receives the ready signals of the transmission of ranging code generator 12, at once satellite team
The index i of row is sent to splitter 13；
S6. splitter 13 chooses corresponding data output end, passes through FIFO according to the index i of the satellite queue received
The output terminal of data terminal 19 exports ranging code.
Specifically, the input terminal at the data fifo end 19 and the output terminal of splitter 13 there are n, and correspond, n
=1,2,3,…n。
Specifically, ranging code generator 12, splitter 13, n data fifo end 19 can all be provided high frequency clock signal.
Specifically, high frequency clock signal is provided by crystal resonator, and it is conveyed to ranging code generator 12 by phaselocked loop device, divides
Road device 13 and n data fifo end 19.
Specifically, splitter 13 output ranging code to data fifo end 19 input terminal during, can high frequency
Ranging code clock domain is transformed into 1.023M ranging code clock domains, and is enabled from the output ranging code of data fifo end 19 and data, increases
The purpose for adding high frequency clock signal is：Because high frequency clock signal frequency is more than n times of ranging code clock frequency, ranging can be made
The generation speed of code generator 12 copes with the demand of n satellite ranging code, is not in the loss of data.
The present invention specific workflow be：Satellite queue receiver receives and stores satellite PRN first, and it is compiled
Number i；Such as：GPS system shares 32 satellites at present, and numbering is PRN=1 ~ 32, and the ranging code of every satellite is different,
Ranging code is corresponded with satellite number PRN, and the parameter of ranging code generation can be determined by satellite number, is carried out in certain point
It is not all to track 32 satellites, but trace into wherein several during positioning.Assuming that it is 3,7,11,12 to trace into numbering,
15,18,19 satellite, then need the numbering by this several satellites to be stored, form a queue, be satellite PRN
Queue.The technical program is exactly：Take that satellite PRN, i=1,1st get from queue is PRN=3, and PRN is given
Gate, gate take out the parameter of No. 3 satellites, give code generator, generate the ranging code data of certain amount, Ran Houzai
The 2nd satellite number is taken, i=2, PRN=7, gate give code generator, successively the parameter taking-up of No. 7 satellites at this time
Go on, the ranging code data until generating all satellites in queue.Because the data generated every time are all the one of ranging code
Part, so after queue poll is complete, then from i=1 continues samsara, then, satellite queue receiver sends out satellite PRN
A yard generator state machine is given, received satellite PRN is sent to gate, is controlled by gate by code generator state machine
Code generator parameter register, gate is according to the corresponding relevant parameter for producing ranging code of satellite PRN selections given, code
Generator parameter register is sent to gate after choosing parameter, and parameter is transmitted further to ranging code generator by gate, surveys
Away from code generator according to the parameter given, after carrying out corresponding algorithm calculating, corresponding ranging code is drawn, meanwhile, ranging code production
As soon as raw device can send a ready signal and give code generator state machine, code generator state machine is received after ready signals connecing
The queue number i of received satellite PRN is sent to splitter, and ranging code can be also sent to splitter by ranging code generator,
Splitter selects corresponding data fifo end port further according to queue number i, and data fifo end port exports final ranging code
Data and data enable.Meanwhile in order to make a ranging code generator cope with multi-satellite, in code generator parameter
Register, gate, ranging code generator, splitter and data fifo end all add high frequency clock signal clk_F so that
Overall speed is accelerated, moreover, by rational time-sharing multiplex, realizes the generation of real time multi-channel ranging code.
The present invention stores corresponding satellite PRN according to the sequencing of the satellite traced into, is selecting a ranging code
In the case of generator, by rational time-sharing multiplex, the generation of real time multi-channel ranging code is realized, reduces multichannel and defends
Hardware resource needed for star tracking, improves treatment effeciency, has saved cost.
Above is with reference to the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment, belongs to the scope of protection of the invention.
Claims (8)
1. a kind of real time multi-channel ranging code generating means, it is characterised in that produced including satellite PRN queues receiver, code
Device state machine, code generator parameter register, gate, ranging code generator, splitter and data fifo end,
The satellite PRN queues receiver is bi-directionally connected with code generator state machine, and satellite PRN queue receivers connect
Receive, the numbering PRN of storage satellite, and satellite PRN is numbered the i of i, i=1,2,3 ...；
The input of the code generator state machine input terminal with gate, ranging code generator output and splitter respectively
End is connected, and code generator state machine receives the PRN and numbering i of satellite PRN queues receiver transmission；
The output terminal of the code generator parameter register is connected with the input terminal of gate, and code generator parameter register
Storage produces the required parameter of ranging code of all GPS L1C satellites at present；
The gate is connected with the input terminal of ranging code generator, and the code generator state machine transmission of gate reception
PRN, and according to the PRN given, go required for the ranging code of correspondence satellite of selection reception code generator parameter register output
Parameter；
Input terminal of the output terminal of the ranging code generator respectively with splitter and code generator state machine is connected, and ranging code
Generator receive gate selection satellite PRN the required parameter of ranging code, and according to given birth to parameter by algorithm
Into ranging code, then, the ready signals sent to code generator state machine；
The output terminal of the splitter is connected with the input terminal at data fifo end, and splitter receives the generation of ranging code generator
Ranging code and code generator state machine transmission satellite PRN numbering i；
The numbering i and ranging code of the satellite PRN of the input terminal received branch unit transmission at the data fifo end, and according to PRN
Numbering i select the output terminal output at corresponding data fifo end.
2. a kind of real time multi-channel ranging code generating means according to claim 1, it is characterised in that further include crystal resonator
With phaselocked loop device, the output terminal of crystal resonator is connected with the input terminal of phaselocked loop device, and crystal resonator produces reference clock and is transferred to lock
Phase ring device；The output terminal of phaselocked loop device respectively with code generator parameter register, gate, ranging code generator, splitter with
And the output terminal at data fifo end is connected, and the high frequency clock signal that crystal resonator is exported exports each device to more than.
3. a kind of real time multi-channel ranging code generating means according to claim 2, it is characterised in that data fifo end
The number of output terminal is set according to the maximum of satellite queue number, and the output terminal number numbering at data fifo end is n, n=1, and 2,
3,…n；And satellite PRN queues receiver is mutual to the output terminal numbering n of the satellite PRN numbering i carried out and data fifo end
It is corresponding.
Filled 4. being generated according to a kind of real time multi-channel ranging code of GPS satellite navigation system of claim 1-3 any one of them
The method put, it is characterised in that the described method comprises the following steps：
S1. code generator state machine obtains satellite queue, and the sequencing being stored according to tracking satellite number is from the satellite
A satellite PRN and index i of the satellite number in queue is read in number queue；
S2. satellite PRN is sent to gate by code generator state machine, controls the gate to be gated with this；
S3. the required parameter of ranging code of selected satellite PRN is sent to ranging code generator by gate；
S4. ranging code generator is according to the parameter of the ranging code of satellite PRN, and combines corresponding algorithm generation ranging code, raw
Into after ranging code, ranging code generator sends ready signals and gives code generator state machine, and ranging code is sent to splitter；
S5. after code generator state machine receives the ready signals of ranging code generator transmission, at once satellite queue
Index i is sent to splitter；
S6. splitter chooses corresponding data output end, passes through FIFO numbers according to the index i of the satellite queue received
Ranging code is exported according to the output terminal at end.
5. the method for a kind of real time multi-channel ranging code generating means according to claim 4, it is characterised in that described
The input terminal at data fifo end and the output terminal of splitter have n, and correspond, n=1,2,3 ... n.
A kind of 6. method of real time multi-channel ranging code generating means according to claim 5, it is characterised in that the survey
High frequency clock signal can be all provided away from code generator, splitter, n data fifo end.
7. according to a kind of method of real time multi-channel ranging code generating means of claim 4-6 any one of them, its feature exists
In the high frequency clock signal is provided by crystal oscillator, and is conveyed to ranging code generator, splitter and n by phaselocked loop
Data fifo end.
8. the method for a kind of real time multi-channel ranging code generating means according to claim 7, it is characterised in that described point
Road device output ranging code to data fifo end input terminal during, high frequency ranging code clock domain can be transformed into
1.023M ranging code clock domains, and enabled from data fifo end output ranging code and data.
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