CN100389542C - Device and method for receiving positioning system signal of mobile wireless terminal - Google Patents
Device and method for receiving positioning system signal of mobile wireless terminal Download PDFInfo
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- CN100389542C CN100389542C CNB2004100362032A CN200410036203A CN100389542C CN 100389542 C CN100389542 C CN 100389542C CN B2004100362032 A CNB2004100362032 A CN B2004100362032A CN 200410036203 A CN200410036203 A CN 200410036203A CN 100389542 C CN100389542 C CN 100389542C
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Abstract
The present invention relates to a device for receiving a positioning system signal of a mobile wireless terminal, which comprises a CDMA antenna, a switching circuit, a GPS receiving antenna, a receiving front end circuit connected with the switching circuit and the GPS receiving antenna, an intermediate frequency demodulation circuit connected with the front end circuit, a modulator connected with the CDMA antenna and the switching circuit, a signal processing controller connected with the intermediate frequency demodulation circuit and the modulator, and a decimal frequency division locking phase loop circuit connected with the circuits, wherein the signal processing controller is used for calculating the frequency deviation according to the phase variation of an I/Q signal of a network receiving signal in order to compensate the frequency deviation of the time slot of the network signal, the compensation value of the frequency deviation of a time slot of the GPS receiving antenna is set as zero, and the sensitivity of a GPS receiver is greatly enhanced so that the positioning accuracy is maximally increased and the requirement of positioning the position of a mobile terminal is satisfied.
Description
Technical field
The present invention relates to the technical field that mobile radio terminal carries out location positioning, be specifically related to the solution that mobile radio terminal application receiving satellite positioning signals and two kinds of signals of network positions signal are comprehensively located.
Background technology
In recent years, along with mobile subscriber's quick increase, to the also increase greatly of demand of location-based service, in cellular system, location-based service has many types, takes the Route Selection service of service, follow-up service enhancing calling etc. as public safety, location-based note.The present technology of method that realizes the cell phone location has following several.A kind of method is that a GPS receiver is installed on cellular handset.This scheme runs well out of doors, but in place indoor or that other satellite-signal can't cover, poor effect.In addition, if be less than 3 satellites, can't position from cold start based on the solution of GPS.Another kind method then relies on network, utilizes ground signal to carry out the triangle location for mobile device.In the area of cellular basestation geometrical condition or cellular basestation coverage condition difference, the effect of this scheme can not be satisfactory.In order to overcome the weakness of GPS and Networking Solutions ﹠ provisioned, need length by the above-mentioned two kinds of schemes of comprehensive locate mode collection.Mobile radio terminal can both be worked in all cases, and can improve accuracy greatly.Portable terminal is comprehensively located solution and has been utilized hybrid mode, has both needed GPS information, needs cdma network information again.No matter make it in the city, the rural area, indoor, the open air can both provide the accurate localization service.
The gps time that utilizes network to provide, mobile phone transfers to precise synchronization with its onboard clock and gps satellite time, thereby has obtained many advantages, comprising: do not have satellite also can finish the location; Based on the satellite locator data that upgrades in time; Network and GPS solution are learnt from other's strong points to offset one's weaknesses, and can improve sensitivity, and have reduced the subsystem cost such as antenna, radio frequency link etc., realize positioning cost thereby cut down.Portable terminal can strengthen indoor sensitivity greatly, and can realize real-time location.Basic principle with portable terminal of comprehensive positioning function is to have utilized the information of GPS and network to realize positioning service.
Advantages such as now the frequency synthesis unit in the mobile radio terminal radio circuit can adopt integral frequency divisioil PHASE-LOCKED LOOP PLL TECHNIQUE or fractional frequency-division phase-locked loop technology, and it is low that the fractional frequency-division phase-locked loop technology possesses phase noise, and spuious low and switching time is fast.But the mobile radio terminal that has comprehensive positioning function at present all adopts the integral frequency divisioil phase-locked loop circuit, the present invention has the mobile radio terminal of comprehensive positioning function and has used the fractional frequency-division phase-locked loop circuit, it is low that mobile radio terminal has possessed the phase noise that the fractional frequency-division phase-locked loop technology had, advantages such as spuious low and switching time is fast, but in comprehensive position application, there are a lot of problems again.Through actual test, find that the average base band carrier-to-noise ratio of gps signal that receives is very low, average Doppler frequency deviation is big, variance is also very big, (concrete test data see Table lattice) thus directly cause the GPS receiver sensitivity very low, positioning accuracy is low, can't satisfy the needs of portable terminal location.
Test by measuring equipment, data result is as shown in the table:
| Test event | Test result |
| Average baseband C/No (average base band carrier-to-noise ratio) | 25.0900dBHz |
| Std deviation (standard deviation) | 0.7628 |
| Average Doppler (average Doppler frequency deviation) | 184.8200Hz |
| Std deviation (standard deviation) | 11.7187 |
| Average SV code phase (average gps satellite code phase) | -10.1944(GPS chips) |
| Std deviation (standard deviation) | 0.0627(GPS chips) |
Summary of the invention
Purpose of the present invention, the GPS receiver sensitivity that just is to solve portable terminal is low, the problem that positioning accuracy is low, provide a kind of mobile radio terminal to receive the apparatus and method of positioning system signal, the inventor has overcome technology prejudice, carry out the long term studies thinking, and by a large amount of testing experiment and test data analyzers, the frequency departure of using the CDMA time slot in the location mobile radio terminal that adopts the fractional frequency-division phase-locked loop circuit compensates automatically, frequency departure offset to the GPS time slot is set to zero basic mentality of designing, positioning accuracy to portable terminal has obtained beyond thought significantly effect, the sensitivity that the present invention can receive portable terminal gps signal increases substantially, average Doppler shift reduces greatly, the Doppler shift variance significantly reduces, thereby improved positioning accuracy greatly, satisfied the requirement of mobile terminal locations location.
A kind of mobile radio terminal receives the device of positioning system signal, comprise communication network signal antenna and switching circuit, the GPS reception antenna, the reception front end circuit that is connected with the GPS reception antenna with switching circuit, the demodulation circuit of intermediate frequency that is connected with the reception front end circuit, the modulator that is connected with switching circuit with the communication network signal antenna, the signal processing controller that is connected with modulator with demodulation circuit of intermediate frequency, the fractional frequency-division phase-locked loop circuit that is connected with foregoing circuit, calculate the deviation of frequency according to the phase changing capacity of the i/q signal of network received signal, frequency departure to the network signal time slot compensates, offset to the frequency departure of GPS time slot is set to zero signal processing controller, the frequency departure compensation that the received signal processing controller transmits, the fractional frequency-division phase-locked loop that frequency is revised.
Described communication network is to use the CDMA Cellular System of direct spread system.
The frequency synthesizer of described fractional frequency-division phase-locked loop is the integrated circuit of the LMX2522 model of National Semiconductor.
Described signal processing controller is the integrated circuit of the MSM5100 model of Qualcomm.
A kind of mobile radio terminal receives the method for positioning system signal, the reception front end circuit that comprises communication network signal antenna and switching circuit, GPS reception antenna, is connected with the GPS reception antenna with switching circuit, the signal processing controller that is connected with modulator with the modulator that receives demodulation circuit of intermediate frequency that front end circuit is connected, be connected with switching circuit with the communication network signal antenna, with demodulation circuit of intermediate frequency, the fractional frequency-division phase-locked loop circuit that is connected with foregoing circuit comprises the steps:
Signal processing controller receives the i/q signal in the network received signal, calculates the deviation of frequency according to the phase changing capacity of signal;
During the network signal time slot, frequency departure is compensated, during the GPS time slot, the offset of frequency departure is set to zero;
The frequency departure offset that fractional frequency-division phase-locked loop received signal processing controller transmits is revised frequency.
Described communication network is to use the CDMA Cellular System of direct spread system.
The frequency synthesizer of described fractional frequency-division phase-locked loop is the integrated circuit of the LMX2522 model of National Semiconductor.
Described signal processing controller is the integrated circuit of the MSM5100 model of Qualcomm.
Description of drawings
Below in conjunction with drawings and Examples the present invention is further described.
Fig. 1 is a system hardware connection side block diagram of the present invention;
Fig. 2 is a software control flow chart of the present invention.
Embodiment
Mobile radio terminal passes through the radiating circuit modulating transformation with the base band CDMA signal of the reverse channel of mobile phone, launches from antenna end with 824MHz～849MHz; The wireless signal of the base station of 869MHz～894MHz that antenna end is received obtains forward channel base band CDMA signal by the demodulation process of receiving circuit; The gps signal (1575.42MHz) that antenna end is received obtains the base band gps signal by the demodulation process of receiving circuit; Provide stable controlled 19.68MHz frequency source for mobile phone simultaneously.
As shown in Figure 1, hardware of the present invention comprises CDMA antenna 1 and switching circuit 2, GPS reception antenna 3, the reception front end circuit 4 that is connected with the GPS reception antenna with switching circuit, the demodulation circuit of intermediate frequency 5 that is connected with the reception front end circuit, the modulator 6 that is connected with switching circuit with the CDMA antenna, the signal processing controller 7 that is connected with modulator with demodulation circuit of intermediate frequency, the fractional frequency-division phase-locked loop circuit 8 that is connected with foregoing circuit, the signal that is received by CDMA antenna 1 and switching circuit 2 and GPS reception antenna 3 is through receiving the filtering of front end circuit 4, after amplification and the mixing, enter demodulation circuit of intermediate frequency 5 and carry out intermediate frequency amplification and demodulation, after signal processing controller 7 is sent in the A/D conversion.Transmit then and after the D/A conversion, to send demodulator 6 demodulation, behind filter, amplify output through power amplifier again, deliver to antenna at last and switching circuit sends by signal processing controller 7.The fractional frequency-division phase-locked loop frequency synthesizer is the degeneration factor of a signal phase, and it produces accurate frequency signal with reference frequency source.The fractional frequency-division phase-locked loop frequency synthesizer adopts the integrated circuit of the LMX2522 model of National Semiconductor.
Frequency synthesizer is controlled by serial bus interface (SBI) by MSM5100, built-in 1 PLL+VCO forms the RF-LO local vibration source, the RF-LO local oscillator directly as the local oscillator input RF-LO of receiving element low-converter, is imported as emission up-converter circuits local oscillator by the local oscillator buffer in low noise amplifier and the frequency mixer.
The GPS received signal is through GPS selective reception band filter, enter low noise amplifier, amplify after high-band is decayed outward after the frequency-selecting of GPS received RF Surface Acoustic Wave Filter, again by the frequency mixer mixing, be transformed to intermediate-freuqncy signal (183.6MHz), receiving intermediate frequency signal enters intermediate frequency processor IFR3500, receiving intermediate frequency signal is carried out the amplification of suitable corresponding gain.
From CDMA signal processing controller MSM5100, detect the deviation of frequency according to the phase changing capacity of the i/q signal of received signal.Feed back to the Pin1 control voltage of the VC-TCXO temperature compensating type crystal oscillator of fractional frequency-division phase-locked loop, VC-TCXO controls sensitivity: 87.5 to 175Hz/V, (control range of 0.5 to 2.5V); Phase noise :-100/-120/-130dBc/Hz is being biased to 100/1K/10KHz.Automatic frequency control (AFC) function that constitutes thus is a benchmark with the frequency of base station, and the frequency error of keeping portable terminal is within the scope of technical standard.
As shown in Figure 2, signal processing controller receives the i/q signal in the cdma network received signal, calculate the deviation of frequency according to the phase changing capacity of signal, when the cdma network signal slot, revise the centre frequency of search window again, frequency departure is compensated, during the GPS time slot, the offset of frequency departure is set to zero, and the frequency departure offset that fractional frequency-division phase-locked loop received signal processing controller transmits is revised frequency.
The application testing device receives gps signal to the localisation of mobile terminals among the present invention and carries out actual measurement, obtains the test data in the following table.
| Test event | Test result |
| Average baseband C/No | 51.0000dBHz |
| Std deviation | 0.0000 |
| Average Doppler | 0.7600Hz |
| Std deviation | 11.7187 |
| Average SV code phase | 0.8277(GPS chips) |
| Std deviation | 0.0289(GPS chips) |
Above-mentioned test result shows that using the sensitivity that portable terminal behind the present invention receives gps signal increases substantially, and average Doppler shift reduces greatly, and the Doppler shift variance significantly reduces, thereby has improved positioning accuracy greatly.
Claims (7)
1. a mobile radio terminal receives the device of positioning system signal, the receiving front-end circuit that comprises communication network signal antenna and switching circuit, GPS reception antenna, is connected with the GPS reception antenna with switching circuit, the demodulation circuit of intermediate frequency that is connected with receiving front-end circuit, the modulator that is connected with switching circuit with the communication network signal antenna, the signal processing controller that is connected with modulator with demodulation circuit of intermediate frequency, the phase-locked loop circuit that links to each other with signal processing controller with modulator, it is characterized in that phase-locked loop circuit is a fractional frequency-division phase-locked loop, also comprises:
Calculate the deviation of frequency according to the i/q signal phase changing capacity of network received signal, the frequency departure of network signal time slot is compensated, the offset of the frequency departure of GPS time slot is set to zero signal processing controller;
And the frequency departure compensation that transmits of received signal processing controller, the fractional frequency-division phase-locked loop that frequency is revised.
2. mobile radio terminal according to claim 1 receives the device of positioning system signal, it is characterized in that described communication network is to use the CDMA Cellular System of direct spread system.
3. mobile radio terminal according to claim 1 receives the device of positioning system signal, and the frequency synthesizer that it is characterized in that described fractional frequency-division phase-locked loop is the integrated circuit of the LMX2522 model of National Semiconductor.
4. receive the device of positioning system signal according to the described mobile radio terminal of each claim in the claim 1 to 3, it is characterized in that described signal processing controller is the integrated circuit of the MSM5100 model of Qualcomm.
5. a mobile radio terminal receives the method for positioning system signal, the reception front end circuit that described mobile radio terminal comprises communication network signal antenna and switching circuit, GPS reception antenna, be connected with the GPS reception antenna with switching circuit, the signal processing controller that is connected with modulator with the modulator that receives demodulation circuit of intermediate frequency that front end circuit is connected, be connected with switching circuit with the communication network signal antenna, with demodulation circuit of intermediate frequency, with the fractional frequency-division phase-locked loop circuit that modulator is connected with signal processing controller, it is characterized in that comprising the steps:
Signal processing controller receives the i/q signal in the network received signal, calculates the deviation of frequency according to the phase changing capacity of signal;
During the network signal time slot, frequency departure is compensated, during the GPS time slot, the offset of frequency departure is set to zero;
The frequency departure offset that fractional frequency-division phase-locked loop received signal processing controller transmits is revised frequency.
6. mobile radio terminal according to claim 5 receives the method for positioning system signal, it is characterized in that described communication network is to use the CDMA Cellular System of direct spread system.
7. mobile radio terminal according to claim 5 receives the method for positioning system signal, and the frequency synthesizer that it is characterized in that described fractional frequency-division phase-locked loop is the integrated circuit of the LMX2522 model of National Semiconductor.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100362032A CN100389542C (en) | 2004-11-04 | 2004-11-04 | Device and method for receiving positioning system signal of mobile wireless terminal |
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| CNB2004100362032A CN100389542C (en) | 2004-11-04 | 2004-11-04 | Device and method for receiving positioning system signal of mobile wireless terminal |
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| CN100389542C true CN100389542C (en) | 2008-05-21 |
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| CN105355159A (en) * | 2015-09-30 | 2016-02-24 | 西安建筑科技大学 | High-precision underground scenic spot self-guide system and positioning method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002080390A1 (en) * | 2001-03-30 | 2002-10-10 | Conexant Systems, Inc. | Frequency plan |
| CN1433152A (en) * | 2002-01-18 | 2003-07-30 | 诺基亚有限公司 | Decimal frequency-dividing synthesizer with sinusoidal generator |
| CN2636555Y (en) * | 2003-08-27 | 2004-08-25 | 海信集团有限公司 | Radio moving location communication module |
| CN2769319Y (en) * | 2004-12-20 | 2006-04-05 | 李文涛 | Concrete seepage road |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002080390A1 (en) * | 2001-03-30 | 2002-10-10 | Conexant Systems, Inc. | Frequency plan |
| CN1433152A (en) * | 2002-01-18 | 2003-07-30 | 诺基亚有限公司 | Decimal frequency-dividing synthesizer with sinusoidal generator |
| CN2636555Y (en) * | 2003-08-27 | 2004-08-25 | 海信集团有限公司 | Radio moving location communication module |
| CN2769319Y (en) * | 2004-12-20 | 2006-04-05 | 李文涛 | Concrete seepage road |
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