CN101887130A - 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 technical field, relate to a kind of programmable navigational satellite spread spectrum sequence generator.
Background technology
The superiority that satellite navigation system embodies in fields such as communication, communications and transportation, military affairs makes each state all drop into lot of manpower and material resources in the research and development of receiver.For measuring accuracy and the stability that guarantees receiver, must test its performance under various conditions.Yet (under the particularly high current intelligence) tested it in the various environment of reality, pay huge economic cost, and this also is 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 the 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 crucial effects 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, does not promptly store pseudo-random sequence in advance, produces corresponding pseudo-random code in real time by logical circuit under clock control.
But these two kinds of methods all have its limitation at present.When 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 expend sizable hardware resource, can't realize.Owing to pseudo-random sequence state shift register, feedback of status function and the output function of every satellite, each wave band all can be different, therefore when adopting real-time generating mode, need 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 finished 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 duty controller 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 duty controller 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 links to each other 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 last displaced condition cascade signal (2c) simultaneously; The output terminal of feedback controller 3 provides the respective input of the feedback of status output signal (3b) of the corresponding levels to other code generator unit simultaneously; O controller 5 receives from all status signals in the 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 duty controller 1 comprises worker state machine 11, first phase register 12, code length register 13, sign indicating number 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 links to each other with first phase register 12, sign indicating number 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 links to each other with sign indicating number counter 14, is used for the loading of the first phase data (12a) of yard counter 14; Sign indicating number 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 links to each other 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 link to each other, its counter spill over (15a) outputs to or 17; Or the reset signal (11c) of door 17 reception worker state machine and the counter spill over (15a) of binary comparator 15, export the comprehensive state reset signal (1d) and the zero clearing of control code counter 14; Multichannel final election device 16 receives the output clock selected control system signal (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 links to each other 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 displacement control signal (22a), its output end signal is feedback of status signal (31a), links to each other with door 33 input ends with each, and 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) links to each other 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: described worker state machine 11 with the state of free time, initialization, work three kinds of mode of operations control programmable navigational satellite spread spectrum sequence generator reset, first phase Loading Control, the control of a sign indicating number counter mode of operation, clock selecting.
The pseudo-random code that a kind of programmable navigational satellite spread spectrum sequence generator of the present invention is used for the satellite-signal emulator generates, can significantly reduce the expense of hardware resource, for realizing improving, other function leaves bigger implementation space, also reduced simultaneously the workload of existing real-time production greatly, and safeguarded easily.
Description of drawings:
Fig. 1: the code generator cellular construction figure of programmable navigational satellite spread spectrum sequence generator
Fig. 2: the duty controller architecture figure 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 synoptic diagram
Fig. 6: Galileo E5 wave band spreading code generates synoptic diagram
Wherein:
1-duty controller 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-sign indicating number 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 cascade output 2d-cascade feedback states
2e-cascade FEEDBACK CONTROL 3a-feedback states
3b-feedback of status output 4a-primary data
5a-sign indicating number position output 11c-reset signal
11d-first phase Loading Control signal 11e-add-subtract control signal
11f-clock selected control system signal 12a-first phase data
13a-code length numerical value 14a-yardage numerical value
15a-counter spill over 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, and the pseudo-random code that is used for the satellite-signal emulator generates, and 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.Form by duty controller 1, initial registers 4, state shift controller 2, feedback controller 3, o controller 5 five parts.Duty controller 1 resets to state own under the control of reset signal 1a at the corresponding levels or cascade reset signal 1b, produce corresponding state reset signal 1d simultaneously state shift controller 2 is resetted, and select to provide the shift clock signal 1c of state shift controller according to state; 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 duty controller architecture figure of code generator unit.Comprise worker state machine 11, first phase register 12, code length register 13, sign indicating number 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 operate as normal 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 to store the chip index value of the correspondence zero hour, code length register 13 is used to store the length of one-period sign indicating number sequence, realize the control of sequence length, sign indicating number 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 duty controller 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, sign indicating number 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, sign indicating number counter 14 subtracts an operation, reduce to till zero until sign indicating number counter 14, worker state machine 11 automatically switches to idle condition, and while sign indicating number 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 operate as normal clock arrived, worker state machine 11 switched to normal mode of operation, jump on each clock along the time, a sign indicating number counter 14 adds an operation;
Step 4): sign indicating number counter 14 is reached when the code length register value, produce counter spill over 15a, when perhaps cascade reset signal 1b is effective, sign indicating number 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 link to each other with the cascade feedback with corresponding levels feedbacks 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 sign indicating number generator polynomial, to reach programmable purpose.
Referring to Fig. 4: be the feedback controller circuit theory diagrams of code generator unit.Form with door 33 by feedback tap register 31, backfeed loop register 32 and 16.Feedback tap register 31 is used to explain code polynomial, according to the feedback input condition of the mode bit of respective shift register, determines the numerical value 0 of the pairing register-bit of backfeed loop register: expression does not have the feedback input; 1 expression has the feedback input.All feedback tap register-bit are that 1 pairing 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 sign indicating number be a Gold sequence, code length is 1023, its maker is produced by two 10 shift register G1 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 among 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, operate as normal clock and sign indicating number output signal are connected together, and other signal wires separately keep separate state to get final product.
CA sign indicating number on the gps system L5 wave band be I5C A and Q5C A, the both is 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 the gps system L5 wave band needs two satellite pseudo random sequence generator A among 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 remove reset signal at the corresponding levels, the initialization clock, outside operate as normal clock and sign indicating number 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, with as synchronous reset usefulness, other signal wires separately keep separate states to get final product.
CA sign indicating number on the E5 wave band of Galileo system is a production, and code length is 10230, and its maker is produced by two 14 shift register G1 and G2 XOR in parallel.Because the code length of two shift registers is the same, therefore only need reset signal at the corresponding levels, initialization clock, operate as normal clock and the sign indicating number 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 the GLONASS system wave band, code length is 511, so its maker only needs one 9 shift register 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 the 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 present generation at the satellite navigation system spread spectrum code sequence that moves or implementing, the satellite navigation system of being supported 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 novel satellite navigation 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 make amendment 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 (6)
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 frequency expansion sequence code generator can be finished 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 duty controller (1), state shift controller (2), feedback controller (3), initial registers (4) and o controller (5).
2. according to the described a kind of programmable navigational satellite spread spectrum sequence generator of claim 1, it is characterized in that: the duty controller (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 links to each other 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 last displaced condition cascade signal (2c) simultaneously; The output terminal of feedback controller (3) provides the respective input of the feedback of status output signal (3b) of the corresponding levels to other code generator unit simultaneously; O controller (5) receives from all status signals in the state shift controller (2), by its inner corresponding relation output pseudo-random sequence signal (5a).
3. according to claim 1,2 arbitrary described programmable navigational satellite spread spectrum sequence generators, it is characterized in that: described duty controller (1) comprises worker state machine (11), first phase register (12), code length register (13), sign indicating number counter (14), binary comparator (15) and MUX (16) or door (17); Worker state machine (11) input end receives reset signal at the corresponding levels (1a) and cascade reset signal (1b), and output terminal links to each other with first phase register (12), sign indicating number 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 links to each other with sign indicating number counter (14); Sign indicating number counter (14) under the driving of shift clock (1c), is counted plus-minus behaviour according to the add-subtract control signal (11e) of worker state machine (11), and its output terminal links to each other 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) link to each other, its counter spill over (15a) outputs to or (17); Or the reset signal (11c) of door (17) reception worker state machine and the counter spill over (15a) of binary comparator (15), export the comprehensive state reset signal (1d) and the zero clearing of control code counter (14); Multichannel final election device (16) receives the output clock selected control system signal (11f) of worker state machine (11), selects passing through of initialization clock (1e) and work clock (1f).
4. according to claim 1,2 arbitrary described programmable navigational satellite spread spectrum sequence generators, it 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 signal (2e), output terminal links to each other with the input end of XOR gate (22); With door (24) input end be feedback states at the corresponding levels (24a) and FEEDBACK CONTROL at the corresponding levels (24b), output 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 (24a) XOR output K level preparation input states (22b) with door (23,24); The K level is moved register (21) output K level status signal (21a).
5. according to claim 1,2 arbitrary described programmable navigational satellite spread spectrum sequence generators, it 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), receive status displacement control signal (22a), its output end signal is feedback of status signal (31a), link to each other 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) is accepted the feedback of status signal (31a) of feedback tap register (31) output, and output terminal is that backfeed loop control bit (32a) links to each other 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).
6. according to claim 1,2 arbitrary described programmable navigational satellite spread spectrum sequence generators, it is characterized in that: described worker state machine (11) with the state of free time, initialization, work three kinds of mode of operations control programmable navigational satellite spread spectrum sequence generator reset, first phase Loading Control, the control of a sign indicating number counter mode of operation, clock selecting.
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| CN102571254A (en) * | 2010-12-31 | 2012-07-11 | 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) |
| CN103888206A (en) * | 2014-03-25 | 2014-06-25 | 航天东方红卫星有限公司 | General simulation system of measurement and control subsystem of minisatellite spread spectrum 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 |
| CN108173569A (en) * | 2017-12-21 | 2018-06-15 | 北京遥测技术研究所 | A kind of satellite load generates system with spreading code |
| CN110246325A (en) * | 2019-06-21 | 2019-09-17 | 广州科技贸易职业学院 | A kind of digital infrared remote-controlled signal modulation circuit and its modulator approach |
| CN110719120A (en) * | 2019-10-15 | 2020-01-21 | 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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| CN102571254A (en) * | 2010-12-31 | 2012-07-11 | 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) |
| 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 |
| CN103888206A (en) * | 2014-03-25 | 2014-06-25 | 航天东方红卫星有限公司 | General simulation system of measurement and control subsystem of minisatellite spread spectrum system |
| 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 |
| CN108173569A (en) * | 2017-12-21 | 2018-06-15 | 北京遥测技术研究所 | A kind of satellite load generates system with spreading code |
| 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 |
| CN110246325A (en) * | 2019-06-21 | 2019-09-17 | 广州科技贸易职业学院 | A kind of digital infrared remote-controlled signal modulation circuit and its modulator approach |
| CN110719120A (en) * | 2019-10-15 | 2020-01-21 | 北京遥感设备研究所 | Universal configurable MSK or QPSK soft spread spectrum modulation system |
| 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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