CN203773056U - GPS navigation telegraph text acquisition device - Google Patents
GPS navigation telegraph text acquisition device Download PDFInfo
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- CN203773056U CN203773056U CN201420171583.XU CN201420171583U CN203773056U CN 203773056 U CN203773056 U CN 203773056U CN 201420171583 U CN201420171583 U CN 201420171583U CN 203773056 U CN203773056 U CN 203773056U
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- gps
- baseband
- gps navigation
- navigation message
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Abstract
The utility model provides a GPS navigation telegraph text acquisition device. The GPS navigation telegraph text acquisition device comprises an antenna module, a radio frequency front-end module for receiving GPS signals, a GPS baseband signal processing module, an external communication serial port module, a clock module, a storage module, a secondary development interface and a mode selection interface, wherein the antenna module, the radio frequency front-end module and the GPS baseband signal processing module are connected with one another, and the clock module, the storage module, the secondary development interface, the mode selection interface and the external communication serial port module are respectively connected with the GPS baseband signal processing module. With the GPS navigation telegraph text acquisition device adopted, real-time positioning with accuracy smaller than 10m can be realized, and navigation telegraph text data output is selectable. The GPS navigation telegraph text acquisition device has high expansibility, supports secondary development and supports long-time navigation telegraph text storage.
Description
Technical field
The utility model belongs to satellite navigation positioning technical field, more particularly a kind of gps navigation message harvester.
Background technology
GPS (Global Positioning System, be called for short GPS) there is the features such as round-the-clock, high precision, high-gain, GPS receiver has been widely used in the fields such as military affairs, navigation, space flight, measurement, traffic, GPS military significance and economic benefit are more come larger, domestic also increasing to the demand of this respect.But the GPS receiver chip of China is nearly all from foreign company, seldom has the GPS receiver chip of independent intellectual property right.The research of domestic GPS receiver is mainly the software GPS receiver based on PC, but the travelling speed that is limited to PC cannot meet real-time location, can only be confined to laboratory; Existing GPS receiver chip Highgrade integration, function singleness.
Utility model content
The purpose of this utility model be to provide a kind of location in real time, output data can select, can secondary development, extendible gps navigation message harvester.
For achieving the above object, the utility model adopts following technical scheme:
Gps navigation message harvester, comprise RF front-end module, GPS baseband signal processing module, PERCOM peripheral communication serial port module, clock module, memory module, second development interface and the mode selection interface of Anneta module, reception gps signal, Anneta module, radio-frequency front-end are connected, GPS baseband signal processing module is connected successively, and clock module, memory module, second development interface, mode selection interface, PERCOM peripheral communication serial port module all connect GPS baseband signal processing module.
Above-mentioned RF front-end module comprises connected successively low noise amplifier, GPS radio-frequency filter, frequency mixer, automatic gain amplifier, AD sampling thief, wherein, low noise amplifier be used for amplifying antenna module receive weak GPS signals; GPS radio-frequency filter suppresses the undesired signal beyond gps signal frequency; Frequency mixer is used for reducing gps signal centre frequency; Automatic gain amplifier is used for stablizing the gps signal power of frequency mixer output; AD sampling thief is used for converting the simulating signal of automatic gain amplifier output to digital signal.
In order to improve local frequency precision, the frequency mixer in RF front-end module is preferably three grades of mixing.
Above-mentioned GPS baseband signal processing module is realized based on FPGA, comprises baseband correlators unit and baseband processing unit, and wherein, baseband correlators unit is peeled off with pseudo-code and peeled off for gps signal is carried out to carrier wave, and produces and interrupt to baseband processing unit; Baseband processing unit is adjusted carrier frequency and code frequency fine setting baseband correlators unit, to reach locking object; Baseband processing unit resolves satellite parametric reduction after gps signal locking, extracts satellite pseudo range observed quantity, Satellite Doppler Method observed quantity, the satellite angle of pitch, satellite gps signal signal to noise ratio (S/N ratio), receiver location and speed.
Described baseband correlators unit is made up of multichannel baseband correlators, baseband correlators comprises latch, the first multiplier, local carrier numerically-controlled oscillator, low-pass filter, local code numerically-controlled oscillator and multichannel pseudo-code strip module, latch, the first multiplier, low-pass filter, multichannel pseudo-code strip module is connected successively, each road pseudo-code strip module comprises the second multiplier and the totalizer that are connected successively, local carrier numerically-controlled oscillator output terminal connects the first multiplier, input end connects baseband processing unit, local code numerically-controlled oscillator output terminal connects the second multiplier of each road pseudo-code strip module, input end connects baseband processing unit.
Above-mentioned second development interface is with curing chip that can programming interface.
Above-mentioned mode selection interface is made up of toggle switch.
Above-mentioned memory module is SD card memory module.
The utility model gps navigation message harvester is exported different navigation informations by mode selection interface selectivity; Reconfigure GPS baseband signal processing module by second development interface, can add as required new procedures, be convenient to secondary and develop flexibly; By the navigation message of memory module storage of collected, (more than 1 year) storage navigation message, carries out data analysis while being convenient to need for a long time.
Compared with prior art, the utlity model has following advantage and beneficial effect:
1, in real time location and positioning precision <10m.
2, flexible configuration, the output of capable of choosing multiple navigation message.
3, extensibility is strong, supports secondary development.
4, support long-time navigation message storage, be convenient to data analysis afterwards.
Brief description of the drawings
Fig. 1 is the utility model structured flowchart;
Fig. 2 is the concrete structure block diagram of the utility model RF front-end module;
Fig. 3 is the concrete structure block diagram of the utility model GPS baseband signal processing module;
Fig. 4 is the utility model GPS baseband correlators cellular construction block diagram;
Fig. 5 is the utility model mode selection interface structured flowchart.
In figure, 1-Anneta module, 2-RF front-end module, 3-GPS baseband signal processing module, 4-PERCOM peripheral communication serial port module, 5-memory module, 6-clock module, 7-second development interface, 8-mode selection interface; 9-latch; 10-the first multiplier; 11-low-pass filter; 12-the second multiplier; 13-totalizer; 14-local carrier numerically-controlled oscillator; 15-local code numerically-controlled oscillator.
Embodiment
Further illustrate the utility model below in conjunction with the drawings and specific embodiments.
See Fig. 1, the utility model gps navigation message harvester comprises Anneta module (1), receive the RF front-end module (2) of gps signal, GPS baseband signal processing module (3) based on FPGA, PERCOM peripheral communication serial port module (4), memory module (5), clock module (6), second development interface (7), mode selection interface (8), Anneta module (1) output terminal connects RF front-end module (2) input end, the gps signal input GPS baseband signal processing module (3) of RF front-end module (2) output, memory module (5), clock module (6), second development interface (7), mode selection interface (8), PERCOM peripheral communication serial port module (4) all connects GPS baseband signal processing module (3).In this concrete enforcement, PERCOM peripheral communication serial port module (4) is followed RS422 agreement; Clock module (6) uninterruptedly provides the time to system; Anneta module (1) adopts the right-handed circular polarization omnidirectional active antenna with the semisphere of approaching gain Covering property, its about 30dB that gains.
See Fig. 2, RF front-end module (2) further comprises connected successively low noise amplifier, GPS radio-frequency filter, frequency mixer, automatic gain amplifier, AD sampling thief, in this concrete enforcement, the weak GPS signals that low noise amplifier receives Anneta module is amplified 12-20dB; The output signal of GPS radio-frequency filter reception low noise amplifier, is used for suppressing gps signal frequency undesired signal in addition, adopts the GPS radio-frequency filter of HMC478ST89 model in this concrete enforcement, can suppress GPS L1 frequency undesired signal in addition; Frequency mixer receives the output signal of GPS radio-frequency filter, and exports the intermediate-freuqncy signal that frequency is 4.309Mhz; The output data of automatic gain amplifier receiving mixer, are used for the gps signal power stability of frequency mixer output near-25dB; AD sampling thief sampling rate is 5.714Mhz, and sampled data is 2 position digital signals, and the simulating signal of automatic gain amplifier output is converted to digital signal.
In order to improve local frequency precision, frequency mixer adopts three grades of frequency mixer, and the local oscillator of first order frequency mixer is 1400Mhz, output signal centre frequency 175.42Mhz; The local oscillator of second level frequency mixer is 140Mhz, and output intermediate-freuqncy signal frequency is 35.42Mhz; The local oscillator of third level frequency mixer is 31.111Mhz, and output intermediate-freuqncy signal frequency is 4.309Mhz.The carrier frequency point of gps signal is 1575.42Mhz, the multiple relation of three grades of local oscillators 1400,140,31.1111 is respectively 1:10:45, frequency mixer requires very high to the frequency stability of local oscillator, 1400Mhz local oscillator was that the local temperature compensating crystal oscillator frequency multiplication of 10Mhz obtains originally, remaining is all that 1400M integral frequency divisioil obtains, integral frequency divisioil, frequency is more accurate, is also easy to realize.
See Fig. 3, GPS baseband signal processing module (3) is realized based on FPGA, comprises baseband correlators unit and baseband processing unit, and baseband correlators unit is made up of multichannel baseband correlators.Baseband correlators unit is peeled off with pseudo-code and is peeled off for gps signal is carried out to carrier wave, and produce and interrupt to baseband processing unit by data bus, and transmit state parameter and the data of gps signal of tracking to baseband processing unit, in this concrete enforcement, baseband correlators unit is made up of 12 roadbed band correlators, can carry out tracking to 12 satellite-signals simultaneously.The interruption of baseband processing unit response baseband correlators, state parameter and the data of reception gps signal, adjust carrier frequency and code frequency and finely tune baseband correlators, to reach the object of locking; Baseband processing unit resolves satellite parametric reduction after gps signal locking.
Yi Yi road baseband correlators is that example describes baseband correlators unit below, sees Fig. 4.The AD sampled data r (tk) of RF front-end module (2) output enters latch (9) and carries out latch, latch (9) sample frequency is with AD sampling clock frequency, sine, cosine signal that local carrier numerically-controlled oscillator (14) produces multiply each other and carry out I, Q demodulation with the data of latch (9) output respectively in the first multiplier (10), I road after demodulation, the outer undesired signal of band that Q circuit-switched data is passed through low-pass filter (11) filtering gps signal, enter respectively the pseudo-code strip module of not going the same way.Local code numerically-controlled oscillator (15) produces early code (E), instantaneous code (P) and late code (L) three kinds of local C/A codes, early code (E), instantaneous code (P) and evening code (L) code element of being separated by successively half, peel off pseudo-code through pseudo-code strip module successively with low-pass filter (11) output signal respectively, pseudo-code strip module comprises connected the second multiplier (12) and totalizer (13), totalizer (13) is carried out integration and cumulative to the second multiplier (12) output data, in this concrete enforcement, the pseudo-code cycle is 1023, in totalizer (13), carry out 1023 points.Totalizer (13) produces look-at-me to baseband processing unit every 1ms, the baseband processing unit of receive interruption signal reads the output of the second multiplier (12), judge whether Current GPS signal locks, if do not had, adjust carrier frequency and code frequency that in baseband correlators, local carrier numerically-controlled oscillator (14) and local code numerically-controlled oscillator (15) produce, to reach the object of locking.
The navigation message of baseband processing unit 50HZ to satellite launch after gps signal locking carries out frame synchronization, decoding, obtains navigation message, comprises satellite launch data time and satellite orbit parameter; From carrier frequency variation amount, extract Doppler measurements, utilize data transmission time and local zone time (local zone time is obtained by clock module) to resolve the current speed of receiver, position and time.
PERCOM peripheral communication serial port module (4) is connected with the GPS baseband signal processing module (3) based on FPGA, follow RS422 serial communication protocol, be used for exporting any one or several data in signal to noise ratio (S/N ratio), receiver location and the speed of the each satellite pseudo range observed quantity of current time, each Satellite Doppler Method frequency displacement, each satellite angle of pitch, each satellite gps signal.
Memory module (5) is SD card memory module, be connected with the GPS baseband signal processing module (3) based on FPGA, follow SPI serial port protocol, adopt FATFS file system, take file with current time name of generation per hour, in each file, store the navigation message of previous hour.
Clock module (6) is connected with the GPS baseband signal processing module (3) based on FPGA, comprise button cell and DS1302 model time chip, button cell uninterruptedly provides power supply for time chip, time chip is that GPS baseband signal processing module (3) provides current time, using this as benchmark, resolve receiver current location.
Second development interface is connected with the GPS baseband signal processing module (3) based on FPGA, comprise with curing chip that can programming interface, by can external command can being imported and put curing chip by programming interface of second development interface, thereby other application of expansion the utility model, or realize verification algorithm, for user's secondary development provides interface flexibly.In this concrete enforcement, adopting the curing chip of second development interface is the PROM of EP2S60N series.
See Fig. 5, mode selection interface (8) is connected with the GPS baseband signal processing module (3) based on FPGA, exports dissimilar navigation information by mode selection interface selectivity.In this concrete enforcement, mode selection interface (8) is by three toggle switch KEY1, KEY2, KEY3 composition, can select 5 kinds of patterns, in table 1, in table, " 0 " represents that corresponding toggle switch is for disconnecting, " 1 " represents that corresponding toggle switch is for connecting, pattern 1 represents to select output satellite pseudo range observed quantity, pattern 2 represents to select output satellite Doppler shift, mode 3 represents to select the output satellite angle of pitch, pattern 4 represents to select output satellite gps signal signal to noise ratio (S/N ratio), pattern 5 represents to select output receiver position and speed, data corresponding to each pattern output to PC end by PERCOM peripheral communication serial port module (4) and show.
The corresponding table of passage of table 1 pattern and each toggle switch
| Pattern numbering | KEY1 | KEY2 | KEY3 |
| 1 | 0 | 0 | 0 |
| 2 | 0 | 0 | 1 |
| 3 | 0 | 1 | 0 |
| 4 | 0 | 1 | 1 |
| 5 | 1 | 0 | 0 |
Claims (9)
1.GPS navigation message harvester, is characterized in that:
Comprise RF front-end module, GPS baseband signal processing module, PERCOM peripheral communication serial port module, clock module, memory module, second development interface and the mode selection interface of Anneta module, reception gps signal, Anneta module, radio-frequency front-end are connected, GPS baseband signal processing module is connected successively, and clock module, memory module, second development interface, mode selection interface, PERCOM peripheral communication serial port module all connect GPS baseband signal processing module.
2. gps navigation message harvester as claimed in claim 1, is characterized in that:
Described RF front-end module further comprises connected successively low noise amplifier, GPS radio-frequency filter, frequency mixer, automatic gain amplifier, AD sampling thief.
3. gps navigation message harvester as claimed in claim 2, is characterized in that:
Described frequency mixer is three grades of frequency mixer.
4. gps navigation message harvester as claimed in claim 1, is characterized in that:
Described GPS baseband signal processing module is realized based on FPGA, comprises the baseband correlators unit and the baseband processing unit that are connected.
5. gps navigation message harvester as claimed in claim 4, is characterized in that:
Described baseband correlators unit is made up of multichannel baseband correlators, baseband correlators comprises latch, the first multiplier, local carrier numerically-controlled oscillator, low-pass filter, local code numerically-controlled oscillator and multichannel pseudo-code strip module, latch, the first multiplier, low-pass filter, multichannel pseudo-code strip module is connected successively, each road pseudo-code strip module comprises the second multiplier and the totalizer that are connected successively, local carrier numerically-controlled oscillator output terminal connects the first multiplier, input end connects baseband processing unit, local code numerically-controlled oscillator output terminal connects the second multiplier of each road pseudo-code strip module, input end connects baseband processing unit.
6. gps navigation message harvester as claimed in claim 1, is characterized in that:
Described second development interface is with curing chip that can programming interface.
7. gps navigation message harvester as claimed in claim 1, is characterized in that:
Described mode selection interface is made up of toggle switch.
8. gps navigation message harvester as claimed in claim 1, is characterized in that:
Described memory module is SD card memory module.
9. gps navigation message harvester as claimed in claim 1, is characterized in that:
Described Anneta module is right-handed circular polarization omnidirectional active antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420171583.XU CN203773056U (en) | 2014-04-10 | 2014-04-10 | GPS navigation telegraph text acquisition device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420171583.XU CN203773056U (en) | 2014-04-10 | 2014-04-10 | GPS navigation telegraph text acquisition device |
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| Publication Number | Publication Date |
|---|---|
| CN203773056U true CN203773056U (en) | 2014-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420171583.XU Expired - Fee Related CN203773056U (en) | 2014-04-10 | 2014-04-10 | GPS navigation telegraph text acquisition device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104698476A (en) * | 2015-04-02 | 2015-06-10 | 芜湖航飞科技股份有限公司 | GPS satellite navigation receiver based on three-level mixing structure |
| CN109286080A (en) * | 2018-10-23 | 2019-01-29 | 北京无线电测量研究所 | A kind of polarization device |
-
2014
- 2014-04-10 CN CN201420171583.XU patent/CN203773056U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104698476A (en) * | 2015-04-02 | 2015-06-10 | 芜湖航飞科技股份有限公司 | GPS satellite navigation receiver based on three-level mixing structure |
| CN109286080A (en) * | 2018-10-23 | 2019-01-29 | 北京无线电测量研究所 | A kind of polarization device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140813 Termination date: 20150410 |
|
| EXPY | Termination of patent right or utility model |