CN203535230U - Radio frequency circuit structure capable of converting GNSS satellite signal to baseband signal - Google Patents
Radio frequency circuit structure capable of converting GNSS satellite signal to baseband signal Download PDFInfo
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- CN203535230U CN203535230U CN201320500373.6U CN201320500373U CN203535230U CN 203535230 U CN203535230 U CN 203535230U CN 201320500373 U CN201320500373 U CN 201320500373U CN 203535230 U CN203535230 U CN 203535230U
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Abstract
The utility model relates to a radio frequency circuit structure capable of converting a GNSS satellite signal to a baseband signal. The radio frequency circuit structure includes a shunt function module, a plurality of frequency conversion function modules corresponding to a plurality of signal output terminals of the shunt function module one to one, a plurality of local oscillator signal modules corresponding to the frequency conversion function modules one to one, and a plurality of analog-to-digital conversion modules corresponding to the frequency conversion function modules one to one, wherein each frequency conversion function module is connected between the corresponding signal output terminal of the shunt function module and the corresponding analog-to-digital conversion module. By adopting the radio frequency circuit structure capable of converting the GNSS satellite signal to the baseband signal, frequency conversion and subsequent signal processing can be individually carried out on a satellite signal of each frequency band, crosstalk among satellite signals is reduced, the signal quality is ensured, and an enough signal to noise ratio is provided for a base-band processing circuit; and the radio frequency circuit has a wider range of application.
Description
Technical field
The utility model relates to GLONASS (Global Navigation Satellite System) field, relates in particular to the radio circuit field of global navigation satellite system receiver, specifically refers to that a kind of satellite-signal of realizing GLONASS (Global Navigation Satellite System) is converted to the radio frequency structure of baseband signal function.
Background technology
Beidou satellite navigation system (refering in particular to the Big Dipper two generations satellite navigation system), GPS(Global Navigation Satellite System, GPS), GLONASS(GLONASS, the abbreviation of GLONASS (Global Navigation Satellite System) in Russian) and Galileo(Galileo, be european satellite navigation system) global navigation satellite system of being set up by China, the U.S., Russia and European Union respectively.
The navigation locating method of main flow refers to navigation data is offered to receiver at present, and to determine the position of satellite when transmitting, and ranging code makes receiver user can determine the transmission delay of signal, thereby determines that satellite is to user's distance.Therefore, GNSS(Global Navigation Satellite System, GPS (Global Position System)) receiver is vital subscriber equipment.
The GNSS receiver circuit of practical application at present is generally partly comprised of antenna element, radio frequency unit, baseband digital signal processing unit etc.Wherein the effect of radio frequency unit leaches GNSS multimode multi-frequency satellite-signal, and suitable gain is provided exactly from neighbourhood noise, to meet the demand of follow-up baseband digital signal processing unit.We can directly leach required GNSS multimode multi-frequency satellite-signal at L-band in theory, then through amplifying, carry out digital sample again.More than but this sample frequency that requires A/D to change (analog to digital conversion) reaches 1GHz, and the processing speed of baseband circuit is had high requirements, under current technical conditions, very difficult realization and cost are high.Therefore, usual way is to use frequency mixer to carry out down coversion to GNSS multimode multi-frequency satellite-signal.Can greatly reduce the technical indicator demand to A/D change-over circuit and baseband processing circuitry like this.
The similar conventional superhet radio architecture of existing a kind of design proposal, has adopted two-stage frequency conversion, by mixing, the carrier frequency of satellite-signal is reduced step by step, at Low Medium Frequency, carries out low pass or bandpass sampling.This design proposal has very complicated circuit structure, while processing the present GNSS multimode multi-frequency satellite-signal up to 8 frequency ranges, must be equipped with numerous local oscillation circuits and mixting circuit.This brings very large difficulty to the debugging of system, and causes whole system significantly to increase on cost, power consumption and volume, runs in the opposite direction with the demand of GNSS receiver portable application.Also has a kind of zero intermediate frequency scheme, adopt single-conversion that GNSS multimode multi-frequency satellite-signal is direct down-conversion-to to zero frequency from 1.15～1.65GHz frequency range, circuit structure is simpler than front a kind of scheme, but has the problem of direct-flow shifted signal, brings very large difficulty to follow-up Base-Band Processing.The nearly zero intermediate frequency scheme of this case well solves these problems.
Utility model content
The purpose of this utility model is the shortcoming that has overcome above-mentioned prior art, provide a kind of can realize reduce system complex degree, reduce crosstalking between each satellite-signal, ensure signal quality, be baseband processing circuitry provides enough signal to noise ratio (S/N ratio), the satellite-signal of realizing GLONASS (Global Navigation Satellite System) with broader applications scope is converted to baseband signal function radio frequency structure.
To achieve these goals, the radio frequency structure that the satellite-signal of realizing GLONASS (Global Navigation Satellite System) of the present utility model is converted to baseband signal function has following formation:
This satellite-signal of realizing GLONASS (Global Navigation Satellite System) is converted to the radio frequency structure of baseband signal function, its principal feature is, described circuit structure comprises functional module along separate routes, with several signal output parts of described shunt functional module several frequency conversion function modules one to one, with described frequency conversion function module one to one several local oscillation signal modules and with described frequency conversion function module several analog-to-digital conversion modules one to one, frequency conversion function module described in each is connected between the signal output part and corresponding analog-to-digital conversion module of corresponding shunt functional module, local oscillation signal module described in each is connected with corresponding frequency conversion function module.
Preferably, frequency conversion function module described in each comprises bandpass filter and mixting circuit, described bandpass filter is connected between the signal output part of corresponding shunt functional module and a signal input part of described mixting circuit, another signal input part of described mixting circuit is connected with the signal output part of corresponding local oscillation signal module, and the signal output part of described mixting circuit is connected with corresponding analog-to-digital conversion module.
More preferably, described frequency conversion function module also comprises single channel functional circuit along separate routes, described mixting circuit comprises two frequency mixer, described single channel along separate routes two signal output parts of functional module is connected with two described frequency mixer respectively, and the signal output part of two described frequency mixer is connected with described analog-to-digital conversion module respectively.
Further, described local oscillation signal module comprises local oscillation signal circuit and phase-shift circuit, the signal output part of described local oscillation signal circuit is connected with described phase-shift circuit, and the original signal output terminal of described phase-shift circuit is connected with two described frequency mixer respectively with phase shift signalling output terminal.
Again further, described phase-shift circuit is 90 ° of phase-shift circuits.
Further, described single channel shunt circuit is power divider.
Further, described frequency mixer is image-reject mixer.
Again further, described frequency mixer is that mirror image disturbs inhibition degree to be greater than the image-reject mixer of 20dB.
Further, described analog-to-digital conversion module comprises low-pass filter, automatic gain control loop and analog to digital conversion circuit, the signal output part of two described frequency mixer is connected with described low-pass filter, and described automatic gain control loop is connected between described low-pass filter and analog to digital conversion circuit.
Again further, described automatic gain control loop comprises and described frequency mixer two variable gain amplifiers one to one, and the signal output part of the frequency mixer described in each is connected with corresponding variable gain amplifier by described low-pass filter.
Again further, described analog to digital conversion circuit be two with described variable gain amplifier analog to digital converter one to one, the signal output part of the variable gain amplifier described in each is connected with corresponding analog to digital converter respectively.
Preferably, described shunt functional module is power divider.
Adopt the satellite-signal of realizing GLONASS (Global Navigation Satellite System) in this utility model to be converted to the radio frequency structure of baseband signal function, there is following beneficial effect:
1, adopt nearly zero intermediate frequency scheme, only use single-conversion by GNSS multimode multi-frequency satellite-signal from 1.15～1.65GHz frequency range Direct Conversion near zero frequency, greatly reduce the complexity of system, reduce cost, power consumption and the volume of system, and avoided the DC offset problem of zero intermediate frequency scheme.
2, adopt high performance image-reject mixer, the inhibition degree that mirror image is disturbed is greater than 20dB, has guaranteed signal quality, adopts frequency mixer and the power divider of high-isolation, makes power level that local oscillator leakage signals arrives antenna radio frequency mouth lower than-102dBm.
3, the GNSS satellite-signal of each frequency range all carries out separately frequency conversion and follow-up signal processing, has reduced crosstalking between each satellite-signal, has guaranteed signal quality, for baseband processing circuitry provides enough signal to noise ratio (S/N ratio)s, has range of application widely.
Accompanying drawing explanation
Fig. 1 is the one-piece construction schematic diagram that the satellite-signal of realizing GLONASS (Global Navigation Satellite System) of the present utility model is converted to the radio frequency structure of baseband signal function.
Fig. 2 is the electrical block diagram of frequency conversion function module of the present utility model and local oscillation signal module.
Fig. 3 is the electrical block diagram of analog-to-digital conversion module of the present utility model.
Embodiment
In order more clearly to describe technology contents of the present utility model, below in conjunction with specific embodiment, conduct further description.
Be illustrated in figure 1 the one-piece construction schematic diagram that the satellite-signal of realizing GLONASS (Global Navigation Satellite System) of the present utility model is converted to the radio frequency structure of baseband signal function.
Adopt circuit structure of the present utility model to realize GNSS multimode multi-frequency satellite-signal is converted to baseband signal and comprise GNSS multimode multi-frequency satellite-signal is divided into the B1/B2/B3 signal in two generations of L1/L2/L5 signal, the Big Dipper of GPS and the L1/L2 signal of the GLONASS process of totally eight path channels after antenna reception; The processing procedure that to comprise the frequency conversion of GNSS multimode multi-frequency satellite-signal be nearly zero frequency signal; Comprise nearly zero frequency signal after filtering, VGA amplifies, A/D is converted to I road and Q railway digital signal process.
Be illustrated in figure 2 the electrical block diagram of frequency conversion function module of the present utility model and local oscillation signal module.
Frequency conversion function module and local oscillation signal module have realized the process that the GNSS satellite-signal of each frequency range is down-converted to the nearly zero frequency signal of two-way quadrature.The GNSS satellite-signal downconversion process of each frequency range is similarly, and at this, we only take L1 frequency range and are described specifically as example.In L1 frequency range, bandpass filter 301 filtering that signal 300 is first 20MHz through 1dB bandwidth, the signal 302 obtaining is divided into the signal 304 and 305 of two-way same magnitude and phase place again through power divider 303.Signal 304 carries out down coversion with local oscillator I road signal 308 through frequency mixer 306, obtains the I signal 400 of L1; Signal 305 carries out down coversion with local oscillator Q road signal 309 through frequency mixer 307, obtains the Q signal 401 of L1.Wherein local oscillator I road signal 308 and Q road signal 309 are that the local oscillation signal 311 being produced by local oscillation circuit 312 obtains through phase-shift network 310, and local oscillator I road signal 308 phase places are than leading 90 degree of Q road signal 309.
Be illustrated in figure 3 the electrical block diagram of analog-to-digital conversion module of the present utility model.
The nearly zero frequency signal of two-way quadrature after filtering, automatic gain control loop, A/D be converted to the process of I road and Q railway digital signal.The GNSS satellite-signal processing procedure of each frequency range is similarly, and at this, we equally only take L1 frequency range and are described specifically as example.Low-pass filter 402 filtering that the I road signal 400 of L1 is 9MHz through 1dB bandwidth, the signal 403 obtaining amplifies through variable gain amplifier 405, picked up signal 407, then carry out analog to digital conversion by 409 pairs of signals of A/D converter 407, obtain digital signal 411.Low-pass filter 402 filtering that Q road signal 401 is 9MHz through 1dB bandwidth, the signal 404 obtaining amplifies through variable gain amplifier 406, picked up signal 408, then carry out analog to digital conversion by 410 pairs of signals of A/D converter 408, obtain digital signal 412.Above-mentioned digital signal 411 and 412 all will be sent into baseband processing circuitry and be further processed.
The satellite-signal of realizing GLONASS (Global Navigation Satellite System) of the present utility model is converted in the technical scheme of radio frequency structure of baseband signal function, wherein each included function device and modular device all can be corresponding to actual particular hardware circuit structures, therefore these modules and unit only utilize hardware circuit just can realize, and do not need to assist can automatically realize corresponding function specifically to control software.
Adopt the satellite-signal of realizing GLONASS (Global Navigation Satellite System) in this utility model to be converted to the radio frequency structure of baseband signal function, there is following beneficial effect:
1, adopt nearly zero intermediate frequency scheme, only use single-conversion by GNSS multimode multi-frequency satellite-signal from 1.15～1.65GHz frequency range Direct Conversion near zero frequency, greatly reduce the complexity of system, reduce cost, power consumption and the volume of system, and avoided the DC offset problem of zero intermediate frequency scheme.
2, adopt high performance image-reject mixer, the inhibition degree that mirror image is disturbed is greater than 20dB, has guaranteed signal quality, adopts frequency mixer and the power divider of high-isolation, makes power level that local oscillator leakage signals arrives antenna radio frequency mouth lower than-102dBm.
3, the GNSS satellite-signal of each frequency range all carries out separately frequency conversion and follow-up signal processing, has reduced crosstalking between each satellite-signal, has guaranteed signal quality, for baseband processing circuitry provides enough signal to noise ratio (S/N ratio)s, has range of application widely.
In this instructions, the utility model is described with reference to its specific embodiment.But, still can make various modifications and conversion obviously and not deviate from spirit and scope of the present utility model.Therefore, instructions and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (12)
1. realize the radio frequency structure that GNSS satellite-signal is converted to baseband signal for one kind, it is characterized in that, described circuit structure comprises functional module along separate routes, with several signal output parts of described shunt functional module several frequency conversion function modules one to one, with described frequency conversion function module one to one several local oscillation signal modules and with described frequency conversion function module several analog-to-digital conversion modules one to one, frequency conversion function module described in each is connected between the signal output part and corresponding analog-to-digital conversion module of corresponding shunt functional module, local oscillation signal module described in each is connected with corresponding frequency conversion function module.
2. the GNSS of realization satellite-signal according to claim 1 is converted to the radio frequency structure of baseband signal, it is characterized in that, frequency conversion function module described in each comprises bandpass filter and mixting circuit, described bandpass filter is connected between the signal output part of corresponding shunt functional module and a signal input part of described mixting circuit, another signal input part of described mixting circuit is connected with the signal output part of corresponding local oscillation signal module, and the signal output part of described mixting circuit is connected with corresponding analog-to-digital conversion module.
3. the GNSS of realization satellite-signal according to claim 2 is converted to the radio frequency structure of baseband signal, it is characterized in that, described frequency conversion function module also comprises single channel functional circuit along separate routes, described mixting circuit comprises two frequency mixer, described single channel along separate routes two signal output parts of functional module is connected with two described frequency mixer respectively, and the signal output part of two described frequency mixer is connected with described analog-to-digital conversion module respectively.
4. the GNSS of realization satellite-signal according to claim 3 is converted to the radio frequency structure of baseband signal, it is characterized in that, described local oscillation signal module comprises local oscillation signal circuit and phase-shift circuit, the signal output part of described local oscillation signal circuit is connected with described phase-shift circuit, and the original signal output terminal of described phase-shift circuit is connected with two described frequency mixer respectively with phase shift signalling output terminal.
5. the GNSS of realization satellite-signal according to claim 4 is converted to the radio frequency structure of baseband signal, it is characterized in that, described phase-shift circuit is 90 ° of phase-shift circuits.
6. the GNSS of realization satellite-signal according to claim 3 is converted to the radio frequency structure of baseband signal, it is characterized in that, described single channel shunt circuit is power divider.
7. the GNSS of realization satellite-signal according to claim 3 is converted to the radio frequency structure of baseband signal, it is characterized in that, described frequency mixer is image-reject mixer.
8. the GNSS of realization satellite-signal according to claim 7 is converted to the radio frequency structure of baseband signal, it is characterized in that, described frequency mixer is that mirror image disturbs inhibition degree to be greater than the image-reject mixer of 20dB.
9. the GNSS of realization satellite-signal according to claim 3 is converted to the radio frequency structure of baseband signal, it is characterized in that, described analog-to-digital conversion module comprises low-pass filter, automatic gain control loop and analog to digital conversion circuit, the signal output part of two described frequency mixer is connected with described low-pass filter, and described automatic gain control loop is connected between described low-pass filter and analog to digital conversion circuit.
10. the GNSS of realization satellite-signal according to claim 9 is converted to the radio frequency structure of baseband signal, it is characterized in that, described automatic gain control loop comprises and described frequency mixer two variable gain amplifiers one to one, and the signal output part of the frequency mixer described in each is connected with corresponding variable gain amplifier by described low-pass filter.
11. GNSS of realization satellite-signals according to claim 10 are converted to the radio frequency structure of baseband signal, it is characterized in that, described analog to digital conversion circuit be two with described variable gain amplifier analog to digital converter one to one, the signal output part of the variable gain amplifier described in each is connected with corresponding analog to digital converter respectively.
12. GNSS of realization satellite-signals according to claim 1 are converted to the radio frequency structure of baseband signal, it is characterized in that, described shunt functional module is power divider.
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| CN201320500373.6U CN203535230U (en) | 2013-08-15 | 2013-08-15 | Radio frequency circuit structure capable of converting GNSS satellite signal to baseband signal |
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| CN201320500373.6U CN203535230U (en) | 2013-08-15 | 2013-08-15 | Radio frequency circuit structure capable of converting GNSS satellite signal to baseband signal |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259562A (en) * | 2014-12-26 | 2016-01-20 | 上海华测导航技术股份有限公司 | Circuit structure for dividing satellite signal into eight frequency points for conversion |
| CN105259563A (en) * | 2014-12-26 | 2016-01-20 | 上海华测导航技术股份有限公司 | Circuit structure converting GPS satellite signal into baseband signal |
| CN105301611A (en) * | 2014-12-26 | 2016-02-03 | 上海华测导航技术股份有限公司 | Baseband part structure for carrying out eight-frequency point processing on satellite signals |
| WO2016101651A1 (en) * | 2014-12-26 | 2016-06-30 | 上海华测导航技术股份有限公司 | Method dividing satellite signals into eight frequency points for processing |
-
2013
- 2013-08-15 CN CN201320500373.6U patent/CN203535230U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259562A (en) * | 2014-12-26 | 2016-01-20 | 上海华测导航技术股份有限公司 | Circuit structure for dividing satellite signal into eight frequency points for conversion |
| CN105259563A (en) * | 2014-12-26 | 2016-01-20 | 上海华测导航技术股份有限公司 | Circuit structure converting GPS satellite signal into baseband signal |
| CN105301611A (en) * | 2014-12-26 | 2016-02-03 | 上海华测导航技术股份有限公司 | Baseband part structure for carrying out eight-frequency point processing on satellite signals |
| WO2016101651A1 (en) * | 2014-12-26 | 2016-06-30 | 上海华测导航技术股份有限公司 | Method dividing satellite signals into eight frequency points for processing |
| US9739889B2 (en) | 2014-12-26 | 2017-08-22 | Shanghai Huace Navigation Technology Ltd. | Method of dividing satellite signal into eight frequency points for processing |
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Denomination of utility model: Radio frequency circuit structure capable of converting GNSS satellite signal to baseband signal Effective date of registration: 20150402 Granted publication date: 20140409 Pledgee: Pudong Shanghai technology financing Company limited by guarantee Pledgor: ComNav Technology Ltd. Registration number: 2015310000010 |
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Address after: 201801 Shanghai city Jiading District Chengliu Road No. 618 Building No. 2 Patentee after: COMNAV TECHNOLOGY Ltd. Address before: 201103 Minhang District Lotus Road, Lane No. 2080, building E, floor 50, Shanghai, China Patentee before: ComNav Technology Ltd. |
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