CN101587179A - GPS receiver based on the ARM chip with differential speed measuring function - Google Patents
GPS receiver based on the ARM chip with differential speed measuring function Download PDFInfo
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- CN101587179A CN101587179A CNA2009100687200A CN200910068720A CN101587179A CN 101587179 A CN101587179 A CN 101587179A CN A2009100687200 A CNA2009100687200 A CN A2009100687200A CN 200910068720 A CN200910068720 A CN 200910068720A CN 101587179 A CN101587179 A CN 101587179A
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Abstract
The invention discloses a kind of GPS receiver, include signal receiving unit, radio-frequency front-end, signalling channel, navigation processing module, storage unit, interface unit, wireless network transmissions unit with differential speed measuring function based on the ARM chip.Compared with prior art, a kind of GPS receiver disclosed by the invention with differential speed measuring function based on the ARM chip, can under the dynamic environment of height, receive gps signal, and by GPRS module realization differential speed measuring, at the precise orbit determination of aerospacecraft with accurately decide to have broad application prospects aspect the appearance, be of great practical significance.
Description
Technical field
The present invention relates to satnav and field of navigation technology, particularly relate to a kind of GPS receiver with differential speed measuring function based on the ARM chip.
Background technology
All the time, and GPS (Global Positioning System, GPS) the Study on Technology personnel are studying how the applying GPS receiver is precisely located under high dynamic environment, and this research work has considerable meaning.High dynamic GPS receiver is at the precise orbit determination of aerospacecraft and accurately decide to have broad application prospects aspect the appearance.
At present more external companies and research institution have obtained fruitful progress at the design aspect of high dynamic GPS receiver.More domestic research institutions also drop into the research of this respect one after another.But up at present, the application item of domestic many GPS also needs to rely on the import of external OEM product, and the timing performance of many GPS receivers and bearing accuracy are still not high.
Improve the performance of GPS receiver and realize more function, need be to using software improvement and upgrading.Software upgrading is just had higher requirement to the calculation process ability of microprocessor.And in high dynamic GPS receiver, because will be to the hyperchannel Continuous Tracking, real time data calculation process amount is big, and is therefore higher to the performance requirement of microprocessor.Except that performance, power consumption and volume are also had high requirements.
Current, press for and develop a kind of GPS receiver, can be implemented in high dynamic environment and receive gps signal down.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of GPS receiver with differential speed measuring function based on the ARM chip, can under the dynamic environment of height, receive gps signal, and by GPRS module realization differential speed measuring, at the precise orbit determination of aerospacecraft with accurately decide to have broad application prospects aspect the appearance, be of great practical significance.
For this reason, the invention provides a kind of GPS receiver, comprising with differential speed measuring function based on the ARM chip:
Signal receiving unit is used to receive the navigation signal that comes from satellite, and will pass to radio-frequency front-end after its amplification;
Radio-frequency front-end is used for received radio frequency satellite navigation signals is transformed into the intermediate frequency satellite navigation signals, and sends signalling channel to after further converting it to digital satellite navigation signal;
Signalling channel is used for the digital satellite navigation signal that receiving radio frequency front end sends, and extracts satellite navigation message, then it is passed to the navigation processing module;
The navigation processing module is used for the navigation message that the received signal passage is exported, and extracts to obtain navigation data, finally comprises navigation for the user provides, is positioned at interior various services;
Storage unit is used to store the received data message of navigation processing module;
Interface unit is used to the navigation processing module that the interface that carries out data interaction with external equipment is provided;
The wireless network transmissions unit, the navigation data that is used for the navigation processing module is obtained is by the data server control center of wireless network transmissions to virtual reference station VRS network, and the differential correcting information that this data server control center is exported is returned to the navigation processing module.
Preferably, described signal receiving unit includes GPS receiver antenna and prime amplifier, wherein,
Described GPS receiver antenna is used for the gps satellite signal of electromagnetic wave form is converted into the current signal of identical change rule, and sends prime amplifier to;
Described prime amplifier is used for the gps satellite signal of current signal form is amplified.
Preferably, described prime amplifier is a low-noise preamplifier.
Preferably, radio-frequency front-end includes reference frequency oscillation source, frequency synthesizer, signal amplification and analog to digital conversion subelement, wherein,
Described reference frequency oscillation source is used to provide the time and frequency standards to frequency synthesizer;
Described frequency synthesizer, the time and frequency standards that provided according to the reference frequency oscillation source is provided, produce local frequency and clock signal of system, and one or more local frequency and radio frequency satellite navigation signals are carried out mixing, form the intermediate frequency satellite navigation signals;
Described signal amplifies and the analog to digital conversion subelement, is used for the intermediate frequency satellite navigation signals is amplified and carry out analog to digital conversion, forms the digital satellite navigation signal and sends signalling channel to.
Preferably, described reference frequency oscillation source is temperature compensating type quartz-crystal resonator TCXO.
Preferably, described signalling channel is peeled off carrier wave and pseudo-noise code in the digital satellite navigation signal by pseudo-noise code track loop and carrier tracking loop, restores the raw data sign indicating number, finally extracts satellite navigation message.
Preferably, described signalling channel is the relationship type signalling channel.
Preferably, described navigation processing module is the ARM microprocessor.
Preferably, the wireless network transmissions unit is for adopting the wireless network transmissions unit of general packet radio service GPRS mode.
By above technical scheme provided by the invention as seen, compared with prior art, the invention provides a kind of GPS receiver with differential speed measuring function based on the ARM chip, can under the dynamic environment of height, receive gps signal, and by GPRS module realization differential speed measuring, at the precise orbit determination of aerospacecraft with accurately decide to have broad application prospects aspect the appearance, be of great practical significance.
Description of drawings
Fig. 1 is the structural representation of a kind of GPS receiver with differential speed measuring function based on the ARM chip provided by the invention;
Fig. 2 is the concrete composition structural representation of a kind of GPS receiver with differential speed measuring function based on the ARM chip provided by the invention;
Fig. 3 is the concrete synoptic diagram of a kind of GPS receiver embodiment with differential speed measuring function based on the ARM chip provided by the invention.
Embodiment
In order to make those skilled in the art person understand the present invention program better, the present invention is described in further detail below in conjunction with drawings and embodiments.
Fig. 1 is the structural representation of a kind of GPS receiver with differential speed measuring function based on the ARM chip provided by the invention.
Referring to Fig. 1, the invention provides a kind of GPS receiver with differential speed measuring function based on the ARM chip, include signal receiving unit 101, radio-frequency front-end 102, signalling channel 103, navigation processing module 104, storage unit 105, interface unit 106 and wireless network transmissions unit 107, wherein:
This signal receiving unit 101 includes GPS receiver antenna 1011 and prime amplifier 1012;
Described GPS receiver antenna 1011 is used for the gps satellite signal of electromagnetic wave form is converted into the current signal of identical change rule, and sends prime amplifier 1012 to;
Described prime amplifier 1012 is connected with GPS receiver antenna 1011, is used for the gps satellite signal of current signal form is amplified.
In the present invention, described prime amplifier 1012 is a low-noise preamplifier.
In the present invention, the main technical requirements of above-mentioned GPS receiver antenna 1011 is: receive frequency is the signal of 1575.42MHz; The aerial radiation direction should be able to guarantee that omnidirectional receives from aerial right-handed circular polarization electric wave; The impedance of feeder should be 50 Ω.When a little less than reach 2.7 * 10-21 to 2.8 * 10-21W/M2HZ gps satellite signal when arriving this receiver antenna, receiver antenna can be converted into the electromagnetic wave energy of gps satellite signal the electric current of identical change rule, and delivers to prime amplifier 1012.By prime amplifier 1012 atomic weak gps satellite signal electric current is amplified.
In the present invention, in order to guarantee the sensitivity of GPS receiver, usually GPS receiver antenna 1011 and low-noise preamplifier 1012 are made of one, thereby receiver antenna output end to line between the low noise amplifier input end is shortened as far as possible, to reduce feeder loss.
Radio-frequency front-end 102 is connected with signal receiving unit 101, is used for received radio frequency (high frequency) satellite navigation signals is transformed into the intermediate frequency satellite navigation signals, and sends signalling channel 103 to after further converting it to digital satellite navigation signal;
In the present invention, radio-frequency front-end 102 includes reference frequency oscillation source 1021, frequency synthesizer 1022, signal amplification and analog to digital conversion subelement 1023, wherein:
Described reference frequency oscillation source 1021 is used to provide the time and frequency standards to frequency synthesizer 1022;
Referring to Fig. 3, in the present invention, described reference frequency oscillation source 1021 is preferably temperature compensating type quartz-crystal resonator TCXO.
Described frequency synthesizer 1022, be connected with reference frequency oscillation source 1021, the time and frequency standards that provided according to reference frequency oscillation source 1021 is provided, produce local frequency (L0) and clock signal of system, and one or more local frequency and radio frequency satellite navigation signals carried out mixing, form the intermediate frequency satellite navigation signals;
Described signal amplifies and analog to digital conversion subelement 1023, is used for the intermediate frequency satellite navigation signals is amplified and carry out analog to digital conversion, forms the digital satellite navigation signal and sends signalling channel 103 to.
In the present invention, when the frequency of the radiofrequency signal (RF) that radio-frequency front-end 102 is received was 1575.42MHz, formed intermediate-freuqncy signal (IF) frequency was 4.309MHz, on the specific implementation, mainly adopted GPS radio frequency chip GP2015 to carry out signal transition.
In the present invention, described signalling channel 103 is peeled off carrier wave and pseudo-noise code in the digital satellite navigation signal by pseudo-noise code track loop and carrier tracking loop, restore the raw data sign indicating number, finally extract satellite navigation message (showing as the raw data sign indicating number).
Need to prove, in the present invention, carrier tracking loop is used for tracking satellite signal carrier frequency and carrier phase, and the local reference signal frequency that carrier number controlled oscillator VC0 produces in the loop is equated with the satellite signal carrier frequency maintenance, and phase differential approaches zero, reaches carrier synchronization.And just can carry out demodulation under the situation of carrier synchronization to the BPSK modulation signal that is modulated at the 1.023Mbps on the 1575.42MHz carrier wave, obtain baseband signal.Pseudo-code time-delay track loop is used for making the phase place of local C/A sign indicating number and C/A code phase in the gps satellite signal that the GPS receiver receives to keep homophase, with realization to the despreading of satellite-signal with carry out pseudo range measurement.
Need to prove that described C/A sign indicating number is a kind of pseudo-random code that gps satellite sends.
In the present invention, above-mentioned signalling channel (Channel) the 103rd, the core of GPS receiver provided by the invention, it is not a kind of simple signalling channel, but the organism that a kind of software and hardware combines.At present, dissimilar GPS receiver mainly contains the signalling channel of three types of relationship type, square-law and code phases etc.Wherein, the relationship type passage is widely used in modern GPS receiver.It is different from other two kinds of passage parts and is that it can extract satellite message from pseudo-noise code, in time records the real time position of motion carrier.Therefore, the relationship type passage is comparatively complicated, mainly is made up of carrier tracking loop and pseudo-noise code track loop.
In the present invention, described signalling channel 103 is preferably the signalling channel of relationship type.The signalling channel of this relationship type multiplies each other satellite-signal (modulation signal) that receives and the replica code (being receiver signal) that receiver is produced, and can obtain high-quality signal.
In the present invention, concrete technology realizes, this navigation processing module 104 is connected with correlator GP2021 (it is 12 channel C/A sign indicating number baseband correlators), data register, described correlator GP2021 be used for each clock from the navigation message sampled signal constantly, measured value and storing into the data register, and navigation processing module 104 sends an interrupt request at set intervals; Navigation processing module 104 is come the measured value stored in the read data register according to described interrupt request, obtains navigation data.
In the present invention, described navigation processing module 104 is microprocessor, and microprocessor mainly is that the programming by the selection of pin and software realizes to the selection of passage and to the operations such as judgement computing of data.
In the present invention, the performance of microprocessor unit has fundamental influence to GPS receiver machine performance.Generally speaking, microprocessor performance is high more, and GPS receiver location is fast more, is suitable for practical application more.
Need to prove that although GPS is a kind of satellite based navigational system, the GPS receiver also can be applied in other occasions.Some typical non-navigation application for example are: time and frequency transmission, static state or kinetic measurement, differential global positioning system, base station are used with reference to GPS receiver, the monitoring of gps satellite signal integrality.
Need illustrate that the GPS receiver provides location, navigation or other services for the user.These services need (effect of these programs be exactly to handle the gps signal that receives by relevant application program, such as testing the speed, need know the position of two points in the certain hour, use the position then divided by the time) could realize that relevant data and the working procedure of memory stores that therefore needs a constant volume in the GPS receiver (for example is to store the gps signal that receives after handling navigation data.In addition, in some application service, pseudorange, carrier phase measurement and other data that the GPS receiver needs the store location scene to be gathered, and the gps satellite ephemeris of institute's decipher etc.These data all are stored in the storer the inside, perhaps directly are stored on the disk by external computing machine.
For example, the GPS receiver can send or reading of data to external device (as computing machine) by serial line interface.This interface unit 106 can also provide the service of man-machine interface, makes the user use the GPS receiver and to recognize location, navigation or other information by display screen by operation keyboard.
Wireless network transmissions unit 107, be connected with navigation processing module 104, the navigation data that is used for navigation processing module 104 is obtained is given virtual reference station (VirtualReference Station by wireless network transmissions, VRS) the data server control center of network, and the differential correcting information that this data server control center is exported is returned to navigation processing module 104.
In the present invention, wireless network transmissions unit 107 is for adopting general packet radio service (GeneralPacket Radio Service, GPRS) the wireless network transmissions unit of mode.Need to prove, GPRS adopts the wireless, packet-switched technology, each user can take a plurality of radio channels simultaneously, same channel again can be by the shared utilization factor with effective raising wireless channel of a plurality of users, data transmission efficiency can reach practical application in theory greatly about 170Kbs (practical application is probably at 10-70Kbs), that be particularly suitable for being interrupted, paroxysmal and frequency, a spot of data transmission also is suitable for mass data amount transmission once in a while.
It is as follows that GPS provided by the invention receives the principle of work and the course of work promptly:
1, antenna 1011 by signal receiving unit 101 is converted into corresponding electric current with the atomic weak electromagnetism wave energy of gps satellite signal, by prime amplifier 1012 the gps satellite signal electric current is amplified, also had concurrently the frequency conversion effect sometimes, then the radio frequency gps satellite signal is passed to radio-frequency front-end 102;
2, radio-frequency front-end 102 carries out mixing with own one or more local frequency signals and radiofrequency signal of being produced, finish the conversion of radiofrequency signal to intermediate-freuqncy signal, simultaneously analog to digital conversion is amplified and carried out to intermediate-freuqncy signal, and this intermediate-freuqncy signal is sampled by sampling frequency, so that follow-up digitized processing (be specially with the GP2015 that is positioned at radio-frequency front-end and carry out digitized processing) passes to intermediate-freuqncy signal signalling channel 103 then;
3, signalling channel 103 is peeled off carrier wave and pseudo-noise code by pseudo-noise code track loop and carrier tracking loop, restores the raw data sign indicating number, then the navigation message (being the raw data sign indicating number) that is obtained is sent into navigation processing module 104 and handles;
4, navigation processing module 104 and storage unit 105, interface unit 106 match and carry out resolving and relevant treatment of ephemeris, obtain the navigation data about locality.
5, navigation processing module 104 (microcontroller) drives wireless network transmissions unit 107 (being wireless communication module) and is connected to Internet realization online, by wireless network its probability position is sent to virtual reference station (Virtual Reference Station, VRS) the data server control center of network, this center is received and is carried out the software calculus of differences after the data and proofread and correct the output differential correcting information (with the terrestrial reference station as reference, obtain revising data, sending to the GPS receiver is exactly calculus of differences), by wireless network its information is transferred back to microcontroller, microcontroller directly links to each other by the serial ports of serial ports with GPS-OEM plate (GPS motherboard), differential correcting information is directly imported into the GPS-OEM plate, thereby be transferred to navigation processing module 104, realize the real-time Transmission of differential data.
On the specific implementation, in the GPS-OEM plate, carry out the software calculus of differences, then by information such as serial ports output exact position speed.
In sum, compared with prior art, the invention provides a kind of GPS receiver with differential speed measuring function based on the ARM chip, can under the dynamic environment of height, receive gps signal, and by GPRS module realization differential speed measuring, at the precise orbit determination of aerospacecraft with accurately decide to have broad application prospects aspect the appearance, be of great practical significance.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1, a kind of GPS receiver with differential speed measuring function based on the ARM chip is characterized in that, comprising:
Signal receiving unit is used to receive the navigation signal that comes from satellite, and will pass to radio-frequency front-end after its amplification;
Radio-frequency front-end is used for received radio frequency satellite navigation signals is transformed into the intermediate frequency satellite navigation signals, and sends signalling channel to after further converting it to digital satellite navigation signal;
Signalling channel is used for the digital satellite navigation signal that receiving radio frequency front end sends, and extracts satellite navigation message, then it is passed to the navigation processing module;
The navigation processing module is used for the navigation message that the received signal passage is exported, and extracts to obtain navigation data, finally comprises navigation for the user provides, is positioned at interior various services;
Storage unit is used to store the received data message of navigation processing module;
Interface unit is used to the navigation processing module that the interface that carries out data interaction with external equipment is provided;
The wireless network transmissions unit, the navigation data that is used for the navigation processing module is obtained is by the data server control center of wireless network transmissions to virtual reference station VRS network, and the differential correcting information that this data server control center is exported is returned to the navigation processing module.
2, GPS receiver as claimed in claim 1 is characterized in that, described signal receiving unit includes GPS receiver antenna and prime amplifier, wherein,
Described GPS receiver antenna is used for the gps satellite signal of electromagnetic wave form is converted into the current signal of identical change rule, and sends prime amplifier to;
Described prime amplifier is used for the gps satellite signal of current signal form is amplified.
3, GPS receiver as claimed in claim 2 is characterized in that, described prime amplifier is a low-noise preamplifier.
4, GPS receiver as claimed in claim 1 is characterized in that, radio-frequency front-end includes reference frequency oscillation source, frequency synthesizer, signal amplification and analog to digital conversion subelement, wherein,
Described reference frequency oscillation source is used to provide the time and frequency standards to frequency synthesizer;
Described frequency synthesizer, the time and frequency standards that provided according to the reference frequency oscillation source is provided, produce local frequency and clock signal of system, and one or more local frequency and radio frequency satellite navigation signals are carried out mixing, form the intermediate frequency satellite navigation signals;
Described signal amplifies and the analog to digital conversion subelement, is used for the intermediate frequency satellite navigation signals is amplified and carry out analog to digital conversion, forms the digital satellite navigation signal and sends signalling channel to.
5, GPS receiver as claimed in claim 4 is characterized in that, described reference frequency oscillation source is temperature compensating type quartz-crystal resonator TCXO.
6, GPS receiver as claimed in claim 1, it is characterized in that, described signalling channel is peeled off carrier wave and pseudo-noise code in the digital satellite navigation signal by pseudo-noise code track loop and carrier tracking loop, restores the raw data sign indicating number, finally extracts satellite navigation message.
7, as each described GPS receiver in the claim 1 to 6, it is characterized in that described signalling channel is the relationship type signalling channel.
8, as each described GPS receiver in the claim 1 to 6, it is characterized in that described navigation processing module is the ARM microprocessor.
As each described GPS receiver in the claim 1 to 6, it is characterized in that 9, the wireless network transmissions unit is for adopting the wireless network transmissions unit of general packet radio service GPRS mode.
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| CNA2009100687200A CN101587179A (en) | 2009-05-04 | 2009-05-04 | GPS receiver based on the ARM chip with differential speed measuring function |
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| CNA2009100687200A CN101587179A (en) | 2009-05-04 | 2009-05-04 | GPS receiver based on the ARM chip with differential speed measuring function |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102012516A (en) * | 2010-10-26 | 2011-04-13 | 上海华测导航技术有限公司 | Self-starting reference station and method for performing global position system (GPS) real-time dynamic measurement |
| CN102253399A (en) * | 2011-05-05 | 2011-11-23 | 哈尔滨工程大学 | Doppler differential compensation velocity measurement method utilizing carrier phase central value |
| CN102313891A (en) * | 2010-07-06 | 2012-01-11 | 上海伽利略导航有限公司 | Navigation receiver |
| CN102508270A (en) * | 2011-09-27 | 2012-06-20 | 山东大学 | VRS (Virtual Reference Station) information receiving terminal based on regional grid division mechanism and operating method of VRS information receiving terminal |
| CN102624408A (en) * | 2011-12-15 | 2012-08-01 | 上海卫星工程研究所 | Low-noise front-end receiver of aircraft |
| CN104898502A (en) * | 2015-04-27 | 2015-09-09 | 中国直升机设计研究所 | Unmanned helicopter portable measurement and control system and measurement and control method |
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2009
- 2009-05-04 CN CNA2009100687200A patent/CN101587179A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102313891A (en) * | 2010-07-06 | 2012-01-11 | 上海伽利略导航有限公司 | Navigation receiver |
| CN102012516A (en) * | 2010-10-26 | 2011-04-13 | 上海华测导航技术有限公司 | Self-starting reference station and method for performing global position system (GPS) real-time dynamic measurement |
| CN102253399A (en) * | 2011-05-05 | 2011-11-23 | 哈尔滨工程大学 | Doppler differential compensation velocity measurement method utilizing carrier phase central value |
| CN102253399B (en) * | 2011-05-05 | 2013-02-06 | 哈尔滨工程大学 | Doppler differential compensation velocity measurement method utilizing carrier phase central value |
| CN102508270A (en) * | 2011-09-27 | 2012-06-20 | 山东大学 | VRS (Virtual Reference Station) information receiving terminal based on regional grid division mechanism and operating method of VRS information receiving terminal |
| CN102508270B (en) * | 2011-09-27 | 2013-05-08 | 山东大学 | VRS (Virtual Reference Station) information receiving terminal based on regional grid division mechanism and operating method of VRS information receiving terminal |
| CN102624408A (en) * | 2011-12-15 | 2012-08-01 | 上海卫星工程研究所 | Low-noise front-end receiver of aircraft |
| CN102624408B (en) * | 2011-12-15 | 2015-02-18 | 上海卫星工程研究所 | Low-noise front-end receiver of aircraft |
| CN104898502A (en) * | 2015-04-27 | 2015-09-09 | 中国直升机设计研究所 | Unmanned helicopter portable measurement and control system and measurement and control method |
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