CN101887130B - Programmable navigational satellite spread spectrum sequence generator - Google Patents
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Abstract
The invention belongs to the technical field of satellite navigation and relates to a programmable navigational satellite spread spectrum sequence generator. The programmable navigational satellite spread spectrum sequence generator comprises input/output modules, a configurable logic unit, a digital clock management module and a block memory which are integrated into a field programmable gate array chip. The programmable navigational satellite spread spectrum sequence generator is characterized in that: different pseudorandom sequence generating methods for different navigation systems by using the spread spectrum sequence generator can be implemented by connecting 1 to 6 code generator units in series or in parallel; and all the code generator units are provided with identical working condition controllers, state shifting controllers, feedback controllers, initial registers and output controllers. The programmable navigational satellite spread spectrum sequence generator is used for generating pseudorandom codes in a satellite signal simulator, so the programmable navigational satellite spread spectrum sequence generator has the advantages of greatly reducing expenditure of hardware resources, reserving a larger space for perfecting other functions, and greatly reducing workload of the conventional real-time generating mode, along with easy maintenance.
Description
Technical field
The invention belongs to the Satellite Navigation Technique field, relate to a kind of programmable navigational satellite spread spectrum sequence generator.
Background technology
The superiority that satellite navigation system embodies in the fields such as communication, communications and transportation, military affairs makes each state all drop into a large amount of manpower and materials in the research and development of receiver.For measuring accuracy and the stability that guarantees receiver, must test its performance under various conditions.Yet (particularly under high current intelligence) tested it in the various environment of reality, pay huge economic cost, and this is also unpractical.Therefore the research and development of satellite-signal emulation technology and emulator enjoy favor.
Utilize the good autocorrelation performance of pseudo-random sequence to realize that latency measurement is the key of carrier location in satellite navigation system; Realizing spread spectrum by pseudo-random sequence, is the effective ways that improve star ground communication anti-interference capability.Therefore, pseudo-random sequence has vital effect in satellite navigation system.
In the satellite-signal emulator, it is essential that the pseudo-random sequence of each navigational system, each satellite, each wave band generates, and dual mode is arranged usually: a kind of is memory-type, is about to the pseudo-random sequence step-by-step storage of the corresponding wave band of each satellite that generation is good in advance; Another kind of mode is real-time production, and namely not prior storage Pseudo random series, produce corresponding pseudo-random code in real time under clock control by logical circuit.
But these two kinds of methods have its limitation at present.When the systems such as GPS (Global Positon System), GLONASS (Global Navigation Satellite System), Galileo were carried out full constellation, multiband emulation, hardware resource was very nervous.Memory-type need to expend sizable hardware resource, can't realize.Because pseudo-random sequence state shift register, feedback of status function and the output function of every satellite, each wave band can be different, when therefore adopting real-time generating mode, need to write one by one each satellite, wave band, workload is huge, and problem is searched inconvenience.
Summary of the invention
The shortcoming that the object of the invention is to overcome above-mentioned prior art provides a kind of programmable Navsat pseudo-random sequence general maker, to satisfy requirement of engineering with not enough.
A kind of programmable navigational satellite spread spectrum sequence generator of the present invention, have the input/output module, configurable logic cell, digital dock administration module, the block storage that are integrated in a slice field programmable gate array chip, it is characterized in that: described frequency expansion sequence code generator can be completed by 1～6 code generator units in series or parallel connection for the different pseudo-random series producing methods of different navigational system; Described code generator unit all has identical working state control device 1), state shift controller 2, feedback controller 3, initial registers 4 and o controller 5.
A kind of programmable navigational satellite spread spectrum sequence generator that the present invention further provides, it is characterized in that: the working state control device 1 of described code generator unit receives reset signal at the corresponding levels (1a), cascade reset signal (1b), initialization clock signal (1e) and work clock signal (1f), its output terminal is connected with the input end of state shift controller 2, and shift clock signal (1c) and state reset signal (1d) are provided; State shift controller 2 receive from initial registers 4 provide primary data (4a), feedback controller 3 provide feedback states signal (3a) and state cascade input signal (2a), cascade feedback states signal (2d), cascade feedback control signal (2e), its output termination feedback controller 3 and o controller 5, status signal (2b) is inputed to feedback controller 3 and o controller 5, export simultaneously last displaced condition cascade signal (2c); The output terminal of feedback controller 3 provides at the corresponding levels feedback of status output signal (3b) respective input to other code generator unit simultaneously; O controller 5 receives from all status signals in state shift controller 2, by its inner corresponding relation output pseudo-random sequence signal (5a).
A kind of programmable navigational satellite spread spectrum sequence generator that the present invention further provides is characterized in that: described working state control device 1 comprises worker state machine 11, first phase register 12, code length register 13, code counter 14, binary comparator 15 and MUX 16 or door 17; Worker state machine 11 input ends receive reset signal at the corresponding levels (1a) and cascade reset signal (1b), and output terminal is connected with first phase register 12, code counter 14 and multichannel final election device 16 or door 17 respectively; First phase register 12 receives the first phase Loading Control signal (11d) of worker state machine 11, and output terminal is connected with code counter 14, is used for the loading of the first phase data (12a) of code counter 14; Code counter 14 is according to the add-subtract control signal (11e) of worker state machine 11, under the driving of shift clock (1c), counts and adds reducing, and its output terminal is connected with binary comparator 15; Binary comparator 15 compares the code length numerical value (13a) of code length register 13 and yardage numerical value (14a), output terminal with or door 17 be connected, its counter overflow signal (15a) outputs to or 17; Or door 17 receives the reset signal (11c) of worker state machine and the counter overflow signal (15a) of binary comparator 15, the state reset signal (1d) of output integrated and the zero clearing of control code counter 14; Multichannel final election device 16 receives the output clock selected control signal processed (11f) of worker state machine 11, selects passing through of initialization clock (1e) and work clock (1f).
A kind of programmable navigational satellite spread spectrum sequence generator that the present invention further provides is characterized in that:: described state shift controller 2 is made of 8～32 grades of identical state processing unit series connection; Every grade of unit comprise shift register 21, XOR gate 22 and with door 23,24; With door 23 input termination cascade feedback states signal (2d) and cascade feedback control signals (2e), output terminal is connected with the input end of XOR gate 22; With door 24 input ends be feedback states at the corresponding levels (24a) and FEEDBACK CONTROL at the corresponding levels (24b), output termination XOR gate 22 input ends; XOR gate 22 arrives K level shift register 21 with the K-1 level state of input, two cascade feedback signal (23a) and feedback signal at the corresponding levels (24a) XOR output K level preparation input states (22b) with door 23,24; The K level is moved register 21 output K level status signals (21a).
A kind of programmable navigational satellite spread spectrum sequence generator that the present invention further provides is characterized in that: described feedback controller 3 comprises feedback tap register 31, backfeed loop register 32 and 8～32 and door 33; The output terminal of feedback tap register 31 input terminated state shift controllers 2, receive status shift control signal (22a), its output end signal is feedback of status signal (31a), be connected with door 33 input ends with each, also output feedback of status output signal (31b) at the corresponding levels is used for cascade simultaneously; Backfeed loop register 32 is accepted the feedback of status signal (31a) of feedback tap register 31 outputs, and output terminal is that backfeed loop control bit (32a) is connected with door 33 input ends with each; Each exports feedback states signal (33a) with door 33 with the state of feedback under the control of backfeed loop register 32.：
A kind of programmable navigational satellite spread spectrum sequence generator that the present invention further provides is characterized in that: the state that described worker state machine 11 is controlled programmable navigational satellite spread spectrum sequence generators with free time, initialization, work three kinds of mode of operations resets, first phase Loading Control, a code counter mode of operation are controlled, clock selecting.
A kind of programmable navigational satellite spread spectrum sequence generator of the present invention is used for the pseudorandom number generation of satellite-signal emulator, can greatly reduce the expense of hardware resource, for realizing improving, other function leaves larger implementation space, also greatly reduced simultaneously the workload of existing real-time production, and easily safeguarded.
Description of drawings:
Fig. 1: the code generator cellular construction figure of programmable navigational satellite spread spectrum sequence generator
Fig. 2: the working state control device structural drawing of code generator unit
Fig. 3: each processing unit circuit theory diagrams of the state shift controller of code generator unit
Fig. 4: the feedback controller circuit theory diagrams of code generator unit
Fig. 5: GPS L5 wave band spreading code generates schematic diagram
Fig. 6: Galileo E5 wave band spreading code generates schematic diagram
Wherein:
1-working state control device 2-state shift controller
3-feedback controller 4-initial registers
5-o controller 11-worker state machine
12-first phase register 13-code length register
14-code counter 15-binary comparator
16-MUX 17-or door
21-bit memory 22-XOR gate
23,24-and door 31-feedback tap register
32-backfeed loop register 33-and door
The 1b-cascade that resets of the 1a-corresponding levels resets
1c-shift clock 1d-state resets
1e-initialization clock 1f-work clock
2a-state cascade input 2b-mode bit
2c-state directly link 2d-cascade feedback states
2e-cascade FEEDBACK CONTROL 3a-feedback states
3b-feedback of status output 4a-primary data
5a-code bit output 11c-reset signal
11d-first phase Loading Control signal 11e-add-subtract control signal
11f-clock selected control signal 12a-processed first phase data
13a-code length numerical value 14a-yardage numerical value
15a-counter overflow signal 21a-K level current state
22a-K-1 level readiness 22b-K level readiness
23a-cascade feedback signal 24a-feedback states at the corresponding levels
24b-FEEDBACK CONTROL 24c-at the corresponding levels feedback signal at the corresponding levels
The output of 31a-feedback signal 31b-feedback of status
32a-backfeed loop control bit 33a-feedback states signal
Embodiment:
The present invention is described in further detail below in conjunction with accompanying drawing:
The present invention aims to provide a kind of general, programmable satellite pseudo random sequence generator, is used for the pseudorandom number generation of satellite-signal emulator, reduces workload when reducing the hardware resource expense, increases the maintainability of system.
Referring to Fig. 1: be the code generator cellular construction figure of programmable navigational satellite spread spectrum sequence generator.Formed by working state control device 1, initial registers 4, state shift controller 2, feedback controller 3, o controller 5 five parts.Working state control device 1 resets to state own under the control of reset signal 1a at the corresponding levels or cascade reset signal 1b, produce simultaneously corresponding state reset signal 1d state shift controller 2 is resetted, and the shift clock signal 1c of state shift controller is provided according to condition selecting; The operations such as state shift controller 2 carries out initialization under the control of controller 1 in working order, resets, displacement are carried out State-output by o controller 5, carry out STATE FEEDBACK CONTROL by feedback controller 3 simultaneously; When state shift controller 2 resets, the initial value of loading condition shift controller 2 from initial registers 4.
Referring to Fig. 2: be the working state control device structural drawing of code generator unit.Comprise worker state machine 11, first phase register 12, code length register 13, code counter 14, binary comparator 15 and MUX 16 or door 17, the work of state of a control shift controller 2.Worker state machine 11 signals carry out the redirect of initialization, free time, three kinds of mode of operations of normal operation automatically under reset signal 1a at the corresponding levels and cascade reset signal 1b control, simultaneously according to the difference of mode of operation, control code counter 14 add reducing; First phase register 12 is used for chip index value corresponding to the storage zero hour, code length register 13 is used for the length of storage one-period code sequence, realize the control of sequence length, code counter 14 is used for chip is counted, and the three loads when reset signal 1a at the corresponding levels is effective.
The workflow of working state control device 1 is as follows:
Step (1): reset signal 1a at the corresponding levels is effective, and worker state machine 11 resets, and prepares to enter init state; First phase register 12, code length register 13, code counter 14 carry out data loading;
Step 2): worker state machine 11 switches to the initialization clock module, select the initialization clock, jump on each initialization clock along the time, code counter 14 subtracts an operation, until code counter 14 is reduced to till zero, worker state machine 11 automatically switches to idle condition, and while code counter 14 is loading data from first phase register 12 again;
Step 3): when machine 11 was in idle condition in working order, when the normal operation clock arrived, worker state machine 11 switched to normal mode of operation, jump on each clock along the time, a code counter 14 adds an operation;
Step 4): code counter 14 is reached when the code length register value, produce counter overflow signal 15a, when perhaps cascade reset signal 1b is effective, code counter 14 is carried out zero clearing, repeating step 3); Simultaneously the state reset signal is exported.
Referring to Fig. 3: be each processing unit circuit theory diagrams of the state shift controller of code generator unit.Series connection before and after 16 this unit is arranged in state shift controller 2, and every grade of unit is made of with door 23,24 bit register 21, XOR gate 22 and two.Two are connected with the cascade feedback with corresponding levels feedback respectively with door 23,24, the cascade State-output of first unit readiness input and last location all can be used for cascade or unsettled, therefore can satisfy the requirement of any code generator polynomial, to reach programmable purpose.
Referring to Fig. 4: be the feedback controller circuit theory diagrams of code generator unit.Formed with door 33 by feedback tap register 31, backfeed loop register 32 and 16.Feedback tap register 31 is used for the statement code polynomial, and according to the feed back input situation of the mode bit of respective shift register, determine the numerical value 0 of the corresponding register-bit of backfeed loop register: expression is without feed back input; 1 expression has feed back input.All feedback tap register-bit are that 1 corresponding mode bit carries out exporting to after mould 2 adds cascade and each and door.
Case study on implementation:
The C of the L1 wave band of gps system the A code be a Gold sequence, code length is 1023, its maker is produced by the shift register G1 of two 10 and G2 XOR in parallel, but the output tap of different satellites is different to some extent; Need two satellite pseudo random sequence generator A, B in the present invention to carry out parallel connection, as shown in Figure 5, the reset signal at the corresponding levels of satellite pseudo random sequence generator A and B, initialization clock, normal operation clock and code output signal are connected together, and other signal wires separately keep separate state to get final product.
CA code on gps system L5 wave band be I5C A and Q5C A, both generated by a short code and a long code XOR.because two code lengths are inconsistent, there is a synchronous reset problem, therefore the CA code generator on gps system L5 wave band needs two satellite pseudo random sequence generator A in the present invention, B carries out parallel connection, and require synchronous reset, as shown in Figure 5, satellite pseudo random sequence generator A and B are except reset signal at the corresponding levels, the initialization clock, outside normal operation clock and code output signal are connected together, also the state reseting signal line of satellite pseudo random sequence generator B to be connected on the cascade reseting signal line of satellite pseudo random sequence generator A, to use as synchronous reset, other signal wires separately keep separate state to get final product.
CA code on the E5 wave band of Galileo system is production, and code length is 10230, and its maker is produced by shift register G1 and the G2 XOR in parallel of two 14.Because the code length of two shift registers is the same, therefore only need reset signal at the corresponding levels, initialization clock, normal operation clock and the code output signal of pseudo random sequence generator A and B are connected together, as shown in Figure 6.
Only used a kind of pseudo-random sequence on the L1 of GLONASS system wave band, code length is 511, so its maker only needs the shift register of 9 to produce.
ICD file according to each satellite navigation system is announced by the setting to the maker initial register, can generate the pseudo-random sequence on each satellite navigation system different frequent points.Table 1 has provided the register configuration (adopting 16 systems to represent) of No. 1 civilian pseudo-random code of star in different satellite navigation systems.
The register configuration of table 1 satellite navigation system pseudo random sequence generator able to programme
This equipment is applicable to the generation of present satellite navigation system spread spectrum code sequence moving or implementing, the satellite navigation system of supporting comprises the standard setting service of gps system, Galileo system, GLONAS system, and No. one, the Big Dipper of China's independent research, the Big Dipper two generations navigational system, and the following New Satellite navigational system that may occur.
Should be pointed out that the above embodiment can make those skilled in the art more fully understand the present invention, but do not limit the present invention in any way.Therefore, although this instructions has been described in detail the present invention with reference to the drawings and specific embodiments,, it will be appreciated by those skilled in the art that and can modify or be equal to replacement the present invention; But all do not break away from the technical scheme of the present invention's spirit and technical spirit, and it all should be encompassed in the middle of the protection domain of patent of the present invention.
Claims (5)
1. programmable navigational satellite spread spectrum sequence generator, have the input/output module, configurable logic cell, digital dock administration module, the block storage that are integrated in a slice field programmable gate array chip, it is characterized in that: described spread spectrum sequence generator can be completed by 1～6 code generator units in series or parallel connection for the different pseudo-random series producing methods of different navigational system; Described code generator unit all has identical working state control device (1), state shift controller (2), feedback controller (3), initial registers (4) and o controller (5);
The working state control device (1) of described code generator unit receives reset signal at the corresponding levels (1a), cascade reset signal (1b), initialization clock signal (1e) and work clock signal (1f), its output terminal is connected with the input end of state shift controller (2), and shift clock signal (1c) and state reset signal (1d) are provided; state shift controller (2) accepting state cascade input signal (2a), cascade feedback states signal (2d), cascade feedback control signal (2e), the feedback states signal (3a) that the primary data (4a) that provides from initial registers (4) and feedback controller (3) provide, its output termination feedback controller (3) and o controller (5), status signal (2b) is inputed to feedback controller (3) and o controller (5), export simultaneously last displaced condition cascade signal (2c), the output terminal of feedback controller (3) provides at the corresponding levels feedback of status output signal (3b) respective input to other code generator unit simultaneously, o controller (5) receives from all status signals in state shift controller (2), by its inner corresponding relation output pseudo-random sequence signal (5a).
2. programmable navigational satellite spread spectrum sequence generator according to claim 1, it is characterized in that: described working state control device (1) comprises worker state machine (11), first phase register (12), code length register (13), code counter (14), binary comparator (15) and MUX (16) or (17); Worker state machine (11) input end receives reset signal at the corresponding levels (1a) and cascade reset signal (1b), and output terminal is connected with first phase register (12), code counter (14) and MUX (16) or door (17) respectively; First phase register (12) receives the first phase Loading Control signal (11d) of worker state machine (11), and output terminal is connected with code counter (14); Code counter (14) is according to the add-subtract control signal (11e) of worker state machine (11), under the driving of shift clock signal (1c), counts and adds reducing, and its output terminal is connected with binary comparator (15); Binary comparator (15) compares the code length numerical value (13a) of code length register (13) with yardage numerical value (14a), output terminal with or door (17) be connected, its counter overflow signal (15a) outputs to or (17); Or door (17) receives the reset signal (11c) of worker state machine and the counter overflow signal (15a) of binary comparator (15), the state reset signal (1d) of output integrated and the zero clearing of control code counter (14); MUX (16) receives the output clock of worker state machine (11) and selects control signal (11f), selects passing through of initialization clock signal (1e) and work clock signal (1f).
3. programmable navigational satellite spread spectrum sequence generator according to claim 1 is characterized in that: described state shift controller (2) is made of 8～32 grades of identical state processing unit series connection; Every grade of unit comprises shift register (21), XOR gate (22) and two and door (23,24); First inputs termination cascade feedback states signal (2d) and cascade feedback control signal (2e) with door (23), and output terminal is connected with the input end of XOR gate (22); Second with door (a 24) input end be feedback states at the corresponding levels (24a) and FEEDBACK CONTROL at the corresponding levels (24b), export termination XOR gate (22) input end; XOR gate (22) arrives K level shift register (21) with the K-1 level state of input, two cascade feedback signal (23a) and feedback signal at the corresponding levels (24c) XOR output K level preparation input states (22b) with door (23,24); K level shift register (21) output K level status signal (21a).
4. programmable navigational satellite spread spectrum sequence generator according to claim 1 is characterized in that: described feedback controller (3) comprises feedback tap register (31), backfeed loop register (32) and 8～32 and door (33); The output terminal of feedback tap register (31) input terminated state shift controller (2), accepting state shift control signal (22a), its output end signal is feedback of status signal (31a), be connected with door (33) input end with each, also output feedback of status output signal (31b) at the corresponding levels is used for cascade simultaneously; Backfeed loop register (32) receives the feedback of status signal (31a) of feedback tap register (31) output, and output terminal is that backfeed loop control bit (32a) is connected with door (33) input end with each; Each exports feedback states signal (33a) with door (33) with the state of feedback under the control of backfeed loop register (32).
5. programmable navigational satellite spread spectrum sequence generator according to claim 2 is characterized in that: the state that described worker state machine (11) is controlled programmable navigational satellite spread spectrum sequence generators with free time, initialization, three kinds of mode of operations of work resets, first phase Loading Control, a code counter mode of operation are controlled, clock selecting.
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| CN102571254B (en) * | 2010-12-31 | 2014-10-15 | 和芯星通科技(北京)有限公司 | Device and method for generating pseudo-random code of GNSS (Global Navigation Satellite System) |
| CN104426651A (en) * | 2013-08-30 | 2015-03-18 | 上海复旦微电子集团股份有限公司 | Data processing method and device |
| CN103888206B (en) * | 2014-03-25 | 2015-11-11 | 航天东方红卫星有限公司 | A kind of moonlet spread spectrum system tracking-telemetry and command subsystem general purpose simulation system |
| CN108173569B (en) * | 2017-12-21 | 2019-12-20 | 北京遥测技术研究所 | Spread spectrum code generation system for satellite load |
| CN110246325B (en) * | 2019-06-21 | 2022-03-18 | 广州科技贸易职业学院 | Full-digital infrared remote control signal modulation circuit and modulation method thereof |
| CN110719120B (en) * | 2019-10-15 | 2021-08-13 | 北京遥感设备研究所 | Universal configurable MSK or QPSK soft spread spectrum modulation system |
| CN113009527A (en) * | 2021-02-23 | 2021-06-22 | 湖南中森通信科技有限公司 | Universal satellite navigation pseudo code generation method |
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| CN201118603Y (en) * | 2007-11-16 | 2008-09-17 | 上海伽利略导航有限公司 | Pseudo satellite baseband signal generator |
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