CN201936013U - Global position system (GPS) and global navigation satellite system (GLONASS) combined simulator - Google Patents
Global position system (GPS) and global navigation satellite system (GLONASS) combined simulator Download PDFInfo
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- CN201936013U CN201936013U CN2010206964633U CN201020696463U CN201936013U CN 201936013 U CN201936013 U CN 201936013U CN 2010206964633 U CN2010206964633 U CN 2010206964633U CN 201020696463 U CN201020696463 U CN 201020696463U CN 201936013 U CN201936013 U CN 201936013U
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Abstract
The utility model discloses a global position system (GPS) and global navigation satellite system (GLONASS) combined simulator. On the basis of a hardware platform consisting of a digital signal processor (DSP) information processing module, a field programmable gate array (FPGA) signal processing module, two digital to analog (D/A) conversion modules, an up-conversion module and a transmitting antenna or an output cable, two relatively independent satellite channels, namely a GPS satellite channel and a GLONASS satellite channel, are separated to realize the combined simulation of the dual systems, namely the GPS and the GLONASS. A single GPS satellite signal and a single GLONASS satellite signal can be simulated in a sub-channel individual processing way through the simulator, and coordinate systems and time systems of the two systems can be unified and synchronized, so that a research and development period is effectively shortened, the research and development cost of a receiver is reduced, and a test environment is convenient to build.
Description
Technical field
The utility model relates to the satellite navigation field, is specifically related to a kind of GPS and GLONASS dual system combined simulator.
Background technology
GNSS (Global Navigation Satellite System) i.e. " GLONASS (Global Navigation Satellite System) ", it is the general designation of satellite navigation system, comprised GPS of USA, Muscovite GLONASS, the Compass (Big Dipper) of China, the Galileo system of European Union, available number of satellite will reach more than 100.With regard to present present situation, built up and the global navigation satellite positioning system that puts into operation mainly contains two, one is the GPS of USA Global Positioning System (GPS), another is a Muscovite GLONASS system.They can both provide services such as accurate localization for the unlimited multi-user in the global range round-the-clockly.GPS and GLONASS are two fully independently systems, and when normal operation, the two positioning performance that can provide is more or less the same.But all there are its limitation in gps system and GLONASS system, for example operate as normal number of satellite deficiency of weak output signal, satellite distribution inequality, GLONASS or the like.Some limitation like this make that its application was very restricted when GPS and GLONASS system carried out navigator fix as single means.In engineering survey, especially in urban road is measured, owing to have high building, trees to block satellite-signal, and " multipath effect " is serious, measure with single GPS means, often can't positioning calculation because of not receiving essential satellite number, perhaps owing to disturb, the location survey precision can not meet the demands.So the GPS/GLONASS combined system is used and has just been arisen at the historic moment.The GPS/GLONASS combined system can overcome the limitation of single GPS and GLONASS system to a great extent, make the user can obtain more accurate, have more reliability and successional standard setting service, can bear many single gps systems the task of can not finishing, thereby, the GPS/GLONASS dual system has its advantage with respect to GPS and GLONASS single system, have a good application prospect.
In the exploitation of GPS/GLONASS dual system receiver, also to consider the application vector (as underway car and boat, aerial aircraft, spacecraft, navigation etc.) of GPS/GLONASS dual system satellite navigation receiver.GPS/GLONASS receiver on the carrier is by receiving the GPS/GLONASS signal of multi-satellite, records the state parameter (moment three-dimensional position and three-dimensional velocity) of motion carrier in real time.To receiver user's, particularly military demand user, as the high dynamic subscriber of military aircraft, guided missile and spacecraft one class, the instrument that has test GPS/GLONASS receiver performance is very necessary.Because if directly use real high velocity environment to carry out actual measurement, cost can be very high, and be difficult for realizing.At this moment, just need to design a kind of GPS/GLONASS dual system combined simulator highly accurate GPS/GLONASS signal is provided.Though single GPS simulator and GLONASS simulator all are visible on the market, but because the difference of between GPS and two systems of GLONASS itself,, ephemeris parameter difference different as Aerospace Satellite difference, frequency of operation and working form, time system difference, coordinate system are not equal, therefore for the design of GPS/GLONASS combination dual system simulator, key is to solve problems such as coordinate system, time, sequential between GPS and GLONASS system be synchronous.
The utility model content
Technical problem to be solved in the utility model provides a kind of GPS and GLONASS dual system combined simulator, it mainly overcomes difference between GPS and two systems of GLONASS by solving coordinate system, time system, sequential stationary problem between GPS and GLONASS system, thereby can simulate a carrier received GPS and GLONASS satellite-signal under same space-time simultaneously.
For addressing the above problem, the utility model is achieved through the following technical solutions:
A kind of GPS and GLONASS dual system combined simulator, mainly be made of host computer and analog hardware platform, described analog hardware platform comprises baseband signal processing module, 2 D/A modular converters, up-conversion module and emitting antenna or output cables that DSP message processing module and FPGA signal processing module constitute; Wherein the DSP message processing module of baseband signal processing module links to each other with the FPGA signal processing module; Wherein be provided with GPS passage and GLONASS passage in the FPGA signal processing module, and the output terminal of above-mentioned two passages is connected with 1 D/A modular converter all; The output terminal of 2 D/A modular converters is connected on be provided with in the same up-conversion module 2 respectively independently on GPS frequency conversion channel and the GLONASS frequency conversion channel; The output terminal of up-conversion module links to each other with emitting antenna or output cable.
Host computer reads GPS ephemeris parameter, the GLONASS ephemeris parameter text that its inside prestores, and be set by the user the movement locus and the system simulation time parameter of receiver, packing data is sent to the DSP message processing module by the FPGA signal processing module then;
DSP message processing module said system simulated time is considered as GPS simulated time T
GPS, and extrapolate GLONASS simulated time T via the conversion formula between gps time system and GLONASS time system
GLONASS, simultaneously, the DSP message processing module calculates navigation message, phase place and the frequency information of GPS and the navigation message of GLONASS, phase place and frequency information respectively according to the ephemeris parameter of receiver movement locus, different system and corresponding simulated time;
The FPGA signal processing module is deposited the result of calculation of DSP message processing module, and receiving after the DSP message processing module sends the reset signal of opening flag position and FPGA signal processing module, by synchronizing clock signals, start GPS passage and GLONASS passage in the FPGA signal processing module synchronously; After GPS passage and GLONASS passage are finished the simulation of carrier signal, pseudo-random code signal and navigation message of corresponding frequencies and modulation, multi-satellite signal and carried out the numeral stack, export to corresponding D/A modular converter respectively;
The conversion of 2 D/A modular converters is finished the digital quantity of GPS and GLONASS baseband signal respectively after the conversion of analog quantity, delivers in the up-conversion module 2 respectively independently on GPS frequency conversion channel and the GLONASS frequency conversion channel;
The intermediate-freuqncy signal that GPS frequency conversion channel in the up-conversion module and GLONASS frequency conversion channel are sent the D/A modular converter here respectively is combined into one the tunnel after being converted to the nominal radiofrequency frequency of GPS and GLONASS, by emitting antenna or output cable output.
In the such scheme, DSP message processing module internal memory contains the program of the conversion formula between gps time system and GLONASS time system, promptly
T
GLONASS＝T
GPS+3h-t-ΔT
In the formula, T
GLONASSBe GLONASS simulated time, T
GPSBe the GPS simulated time, t is UTC (Coordinated Universal Time(UTC)) the jump second time, and Δ T is the time deviation of GLONASS and GPS; 3h is 3 hours preset parameter time.
In the such scheme, also be provided with a clock correction module in the DSP message processing module, this clock correction module interval of delta t is at regular intervals just transferred the clock count on the FPGA signal processing module, and the difference between comparison clock counting and the frequency of operation * Δ t, draw the leading or hysteresis clock number of local clock, and difference is compensated by frequency control word.
The span of above-mentioned Δ t is generally between 1ms～10ms.
Compared with prior art, the utility model provides a kind of GPS and GLONASS dual system combined simulator.On hardware, the utility model is on the basis of a cover DSP+FPGA+DA+RF platform, be separated out 2 relatively independent GPS and GLONASS satellite channel and realize the combine analog of GPS and GLONASS dual system, not only can effectively utilize each chip on the hardware platform like this, particularly the processing redundancy on FPGA signal processing module and the up-conversion module reduces hardware, reduces cost; Also can effectively reduce simultaneously the error that the individual difference of chip is brought, guarantee accurately to simulate gps signal and GLONASS signal under the true environment; On function, the utility model not only can be realized the simulation of independent gps satellite signal and independent GLONASS satellite-signal by subchannel individual processing mode, and the unified and time synchronous of the coordinate system that can realize two systems, thereby effectively shortened the R﹠D cycle, reduced the receiver R﹠D costs, made things convenient for test environment to make up.Radiofrequency signal by designed GPS that goes out of the utility model and the output of GLONASS dual system combined simulator, can realize the dual system integrated positioning, and positioning result can be compared with the track set in the simulator, realize the closed loop indoor environment test of GPS/GLONASS bimodulus combination receiver, be used for receiver performance test, the research and development of high-end receiver.
Description of drawings
Fig. 1 is the principle schematic of a kind of GPS of the utility model and GLONASS dual system combined simulator.
Embodiment
A kind of GPS of the utility model and GLONASS dual system combined simulator are as shown in Figure 1, its hardware components mainly is made of host computer and analog hardware platform, and described analog hardware platform comprises baseband signal processing module, 2 D/A modular converters, up-conversion module and emitting antenna or output cables that DSP message processing module and FPGA signal processing module constitute.Host computer links to each other with the FPGA signal processing module of baseband signal processing module through serial ports, and the FPGA signal processing module of baseband signal processing module is connected to the up-conversion module to emitting antenna or output cable through the D/A modular converter.The DSP message processing module of baseband signal processing module links to each other with the FPGA signal processing module.Wherein be provided with GPS passage and GLONASS passage in the FPGA signal processing module, and the output terminal of above-mentioned two passages is connected with 1 D/A modular converter all.The output terminal of 2 D/A modular converters is connected on be provided with in the same up-conversion module 2 respectively independently on GPS frequency conversion channel and the GLONASS frequency conversion channel.The output terminal of up-conversion module links to each other with emitting antenna or output cable.
Host computer reads GPS ephemeris parameter, the GLONASS ephemeris parameter text that its inside prestores, and be set by the user parameters such as the movement locus of receiver and system simulation time, packing data is sent to the DSP message processing module by the FPGA signal processing module then.In the utility model preferred embodiment, host computer finishes mainly that text parameter extraction, scene generate, the satellite channel state of simulation, satellite starry sky distribute, simulated time defines, receiver location and speed and analog position are compared with the receiver positioning result.
DSP message processing module said system simulated time is considered as GPS simulated time T
GPS, and calculate GLONASS simulated time T via the gps time system of DSP message processing module stored and the conversion formula between the GLONASS time system
GLONASSConversion formula between above-mentioned gps time system and GLONASS time system is
T
GLONASS＝T
GPS+3h-t-ΔT
In the formula, T
GLONASSBe GLONASS simulated time, T
GPSBe the GPS simulated time, t is UTC (Coordinated Universal Time(UTC)) the jump second time, and Δ T is the time deviation of GLONASS and GPS; 3h is 3 hours preset parameter time.
The DSP message processing module calculates navigation message, phase place and the frequency information of GPS and navigation message, phase place and the frequency information of GLONASS respectively according to the ephemeris parameter of receiver movement locus, different system and corresponding simulated time.The DSP message processing module is finished most of work such as parameter initialization and control, calculating, specifically comprises: be extracted and encoded as navigation message according to ephemeris parameter; Set emulation movement locus and satellite constellation constantly according to the user, as seen whether prediction GPS or GLONASS satellite; For visible star, calculate corresponding emulation phase retardation and signal frequency constantly, and the text of all visible stars, phase information and frequency information are issued the FPGA signal processing module.The DSP message processing module is also set up the error model of all kinds of error sources in this process, according to all kinds of error sources, generates corresponding error simulate signal by error model.
In addition, in the utility model preferred embodiment, also be provided with a clock correction module in the DSP message processing module, this clock correction module interval of delta t is at regular intervals just transferred the clock count on the FPGA signal processing module, and the difference between comparison comparison clock counting and the frequency of operation * Δ t, draw the leading or hysteresis clock number of local clock, and difference is compensated by frequency control word.The span of above-mentioned Δ t is between 1ms～10ms.
The FPGA signal processing module is deposited the result of calculation of DSP message processing module, and receiving after the DSP message processing module sends the reset signal of opening flag position and FPGA signal processing module, by synchronizing clock signals, start GPS passage and GLONASS passage in the FPGA signal processing module synchronously; After DSP passage and GLONASS passage are finished the simulation of carrier signal, pseudo-random code signal and navigation message of corresponding frequencies and modulation, multi-satellite signal and carried out the numeral stack, export to corresponding D/A modular converter respectively.Specifically: the FPGA signal processing module is assigned to corresponding signal to visible star and generates passage according to the satellitosis of DSP message processing module transmission.Parameter according to the transmission of DSP message processing module, set original carrier phase place, code phase, the navigation message of each satellite and select phase place, generate corresponding text, sign indicating number, carrier signal according to frequency information again, and finish three's spread spectrum, modulation, obtain a GPS or GLONASS satellite-signal, it is synthetic that last a plurality of satellite-signal carries out the superposition numeral, just can export to the D/A modular converter of rear end.The signal of certain frequency described in the utility model generates, and all adopts high accuracy number frequency synthesis (NCO) technology to carry out signal frequency and accurately simulates, output high accuracy number intermediate frequency Satellite Simulation signal.
The conversion of 2 D/A modular converters is finished the digital quantity of GPS and GLONASS baseband signal respectively after the conversion of analog quantity, delivers in the up-conversion module 2 respectively independently on GPS frequency conversion channel and the GLONASS frequency conversion channel.
The intermediate-freuqncy signal that GPS frequency conversion channel in the up-conversion module and GLONASS frequency conversion channel are sent the D/A modular converter here respectively is combined into one the tunnel after being converted to the nominal radiofrequency frequency of GPS and GLONASS, by emitting antenna or output cable output.Wherein emitting antenna is a L-band right-handed circular polarization omnidirectional antenna.
Claims (4)
1. GPS and GLONASS dual system combined simulator, mainly be made of host computer and analog hardware platform, it is characterized in that: described analog hardware platform comprises baseband signal processing module, 2 D/A modular converters, up-conversion module and emitting antenna or output cables that DSP message processing module and FPGA signal processing module constitute; Wherein the DSP message processing module of baseband signal processing module links to each other with the FPGA signal processing module; Be provided with GPS passage and GLONASS passage in the FPGA signal processing module, and the output terminal of above-mentioned two passages is connected with 1 D/A modular converter all; The output terminal of 2 D/A modular converters is connected on be provided with in the same up-conversion module 2 respectively independently on GPS frequency conversion channel and the GLONASS frequency conversion channel; The output terminal of up-conversion module links to each other with emitting antenna or output cable.
2. a kind of GPS according to claim 1 and GLONASS dual system combined simulator is characterized in that DSP message processing module internal memory contains the conversion formula between gps time system and GLONASS time system, i.e. T
GLONASS=T
GPSThe DSP message processing module of+3h-t-Δ T, wherein T
GLONASSBe GLONASS simulated time, T
GPSBe the GPS simulated time, be jump second time Coordinated Universal Time(UTC), Δ T is the time deviation of GLONASS and GPS.
3. a kind of GPS according to claim 1 and 2 and GLONASS dual system combined simulator is characterized in that, also are provided with a clock correction module in the DSP message processing module.
4. a kind of GPS according to claim 1 and GLONASS dual system combined simulator is characterized in that: described emitting antenna is a L-band right-handed circular polarization omnidirectional antenna.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010206964633U CN201936013U (en) | 2010-12-31 | 2010-12-31 | Global position system (GPS) and global navigation satellite system (GLONASS) combined simulator |
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| CN2010206964633U CN201936013U (en) | 2010-12-31 | 2010-12-31 | Global position system (GPS) and global navigation satellite system (GLONASS) combined simulator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104281048A (en) * | 2014-08-26 | 2015-01-14 | 重庆九洲星熠导航设备有限公司 | Vehicle-mounted Beidou dual-mode satellite communication and positioning timing system and method |
| CN109509382A (en) * | 2018-09-18 | 2019-03-22 | 中交航信（上海）科技有限公司 | GPS prototype signal simulator |
| CN110824509A (en) * | 2019-11-27 | 2020-02-21 | 中国科学院微小卫星创新研究院 | Navigation satellite signal generation simulator |
| CN112067892A (en) * | 2020-08-06 | 2020-12-11 | 北京自动化控制设备研究所 | Signal conversion synchronization device and signal conversion synchronization method using same |
-
2010
- 2010-12-31 CN CN2010206964633U patent/CN201936013U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104281048A (en) * | 2014-08-26 | 2015-01-14 | 重庆九洲星熠导航设备有限公司 | Vehicle-mounted Beidou dual-mode satellite communication and positioning timing system and method |
| CN104281048B (en) * | 2014-08-26 | 2017-04-12 | 重庆九洲星熠导航设备有限公司 | Vehicle-mounted Beidou dual-mode satellite communication and positioning timing system and method |
| CN109509382A (en) * | 2018-09-18 | 2019-03-22 | 中交航信（上海）科技有限公司 | GPS prototype signal simulator |
| CN110824509A (en) * | 2019-11-27 | 2020-02-21 | 中国科学院微小卫星创新研究院 | Navigation satellite signal generation simulator |
| CN112067892A (en) * | 2020-08-06 | 2020-12-11 | 北京自动化控制设备研究所 | Signal conversion synchronization device and signal conversion synchronization method using same |
| CN112067892B (en) * | 2020-08-06 | 2023-10-13 | 北京自动化控制设备研究所 | Signal conversion synchronization device and signal conversion synchronization method using same |
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Granted publication date: 20110817 Termination date: 20111231 |