CN105259563A - Circuit structure converting GPS satellite signal into baseband signal - Google Patents
Circuit structure converting GPS satellite signal into baseband signal Download PDFInfo
- Publication number
- CN105259563A CN105259563A CN201410855726.3A CN201410855726A CN105259563A CN 105259563 A CN105259563 A CN 105259563A CN 201410855726 A CN201410855726 A CN 201410855726A CN 105259563 A CN105259563 A CN 105259563A
- Authority
- CN
- China
- Prior art keywords
- circuit
- signal
- gps satellite
- signaling channel
- converted
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Position Fixing By Use Of Radio Waves (AREA)
- Superheterodyne Receivers (AREA)
Abstract
The invention discloses a circuit structure converting a GPS satellite signal into a baseband signal. The circuit structure is composed of a signal input terminal, an amplifier, a power division circuit, a filter circuit, an up conversion circuit part, a down conversion circuit part and a baseband signal processing circuit. The signal input terminal is connected with the power division circuit by the amplifier. The power division circuit divides a GPS satellite signal into signal channels with three frequency bands L1, L2 and L5; the L1 signal channel is connected with the baseband signal processing circuit by the filter circuit and the down conversion circuit part successively; the L2 signal channel and the L5 signal channel are connected with the baseband signal processing circuit by the filter circuit, the up conversion circuit part, and the down conversion circuit part successively. According to the invention, with the circuit structure, the crosstalk between all satellite signals is reduced and an enough signal to noise ratio can be provided for the baseband signal processing circuit.
Description
Technical field
The present invention relates to technical field of satellite navigation, particularly relate to a kind of circuit structure gps satellite signal being converted to baseband signal.
Background technology
GPS (English: GlobalPositioningSystem is called for short GPS), also known as Global Positioning System (GPS), is a round orbiter navigational system of middle distance.It can be located accurately for earth surface overwhelming majority area provides, test the speed and high-precision time standard.Can meet and be positioned at the whole world Anywhere or the accurate continuously determination three-dimensional position of the user of terrestrial space, three-dimensional motion and the needs of time.
Gps satellite signal adopts the synthesis of CDMA (CDMA) modulation technique, and its complete signal comprises carrier wave, pseudo-random code and numeric data code.Signal carrier is in L-band, and within three years, wave frequency remembers L1 (1575.42MHz), L2 (1227.6MHz) and L5 (1176.45MHz) respectively.At present every satellite all at L1 and L2 two frequencies and part satellite at L5 transmitted on frequencies ranging code and navigation message.This navigation message includes: the modified value etc. that the orbit parameter of satellite, timing parameter, orbital exponent parameter, air reflect gps signal, and navigation message is for the position (in satellite constellation absolute position) during receiver user determination satellite emission signal and time; Beating for calculating time from satellite to receiver and propagation delay time of ranging code code element, and then convert distance to, thus obtain the relative distance of subscriber computer to satellite.Absolute position combines with relative position and just obtains the absolute position of receiver user.
The working method that the GPS circuit of current practical application is general is leached from neighbourhood noise by gps satellite signal, provides suitable gain, and be converted into baseband digital signal, to meet the demand of follow-up baseband digital signal processing unit.Therefore, usual way uses frequency mixer to carry out down coversion to gps satellite signal.Greatly can reduce the technical indicator demand parameter demand difficulty to A/D change-over circuit and baseband processing circuitry like this, but utilizing frequency mixer to be transformed to by high frequency gps satellite signal introduces image interference compared with while low-IF frequency.
Summary of the invention
In view of current technical field of satellite navigation above shortcomings, the invention provides a kind of circuit structure gps satellite signal being converted to baseband signal, can image interference be reduced, and reduce the crosstalk between each satellite-signal.
For achieving the above object, embodiments of the invention adopt following technical scheme:
A kind of circuit structure gps satellite signal being converted to baseband signal, described circuit structure gps satellite signal being converted to baseband signal comprises signal input part, amplifier, merit parallel circuit, filtering circuit, up-converter circuit part, lower frequency changer circuit part and base band signal process circuit, described signal input part is connected with described merit parallel circuit by amplifier, gps satellite signal is divided into L1 by described merit parallel circuit, the signaling channel of L2 and L5 tri-frequency ranges, described L1 signaling channel is connected with described base band signal process circuit with lower frequency changer circuit part through described filtering circuit successively, described L2 signaling channel and L5 signaling channel are respectively successively through described filtering circuit, up-converter circuit part is connected with described base band signal process circuit with lower frequency changer circuit part.
According to one aspect of the present invention, described up-converter circuit part comprises one-level local oscillation circuit and frequency mixer, described one-level local oscillation circuit is connected with described frequency mixer, and described L2 signaling channel is connected with described lower frequency changer circuit part respectively by a frequency mixer with L5 signaling channel.
According to one aspect of the present invention, described L2 signal frequency range and L5 signal frequency range up-convert to the frequency range of nearly L1 signal respectively by frequency mixer.
According to one aspect of the present invention, described one-level local oscillation circuit comprises start-oscillation circuit and loop filter.
According to one aspect of the present invention, the local oscillation signal frequency range that described one-level local oscillation circuit produces is 300MHz-400MHz.
According to one aspect of the present invention, described frequency mixer is image-reject mixer.
According to one aspect of the present invention, described lower frequency changer circuit part comprises secondary local oscillation circuit, mixting circuit, wave filter and ADC D/A converting circuit, described secondary local oscillation circuit is connected with described mixting circuit, and described L1 signaling channel, L2 signaling channel are connected with described base band signal process circuit through mixting circuit, wave filter and ADC D/A converting circuit respectively successively with L5 signaling channel.
According to one aspect of the present invention, between described wave filter and described ADC D/A converting circuit, be also connected to AGC amplifying circuit.
According to one aspect of the present invention, described L1 signaling channel produces the L1 new signal of nearly zero intermediate frequency by described mixting circuit synthesis, described L2 signaling channel produces the L2 new signal of nearly zero intermediate frequency by described mixting circuit synthesis, and L5 signaling channel produces the L5 new signal of nearly zero intermediate frequency by described mixting circuit synthesis.
According to one aspect of the present invention, the local oscillation signal frequency range that described secondary local oscillation circuit produces is 1545MHz-1615MHz.
Advantage of the invention process: circuit structure gps satellite signal being converted to baseband signal of the present invention is by being connected described signal input part with described merit parallel circuit by amplifier, gps satellite signal is divided into L1 by described merit parallel circuit, the signaling channel of L2 and L5 tri-frequency ranges, described L1 signaling channel is connected with described base band signal process circuit with lower frequency changer circuit part through described filtering circuit successively, described L2 signaling channel and L5 signaling channel are respectively successively through described filtering circuit, up-converter circuit part is connected with described base band signal process circuit with lower frequency changer circuit part, gps satellite signal is divided into L1 by merit parallel circuit, L2 and L5 tri-frequency band signals, all independent signal transacting is carried out to the gps satellite signal of each frequency range, image-reject mixer is wherein adopted to carry out upconversion process to L2 signaling channel and L5 signaling channel, reduce image interference, again independently down coversion is carried out to each frequency band signals, filtering, amplification and A/D are converted to baseband signal, reduce the crosstalk between each satellite-signal, for baseband processing circuitry provides enough signal to noise ratio (S/N ratio)s.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of electrical block diagram gps satellite signal being converted to baseband signal of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, a kind of circuit structure gps satellite signal being converted to baseband signal, described circuit structure gps satellite signal being converted to baseband signal comprises signal input part 1, amplifier 2, merit parallel circuit 3, filtering circuit 4, up-converter circuit part 5, lower frequency changer circuit part 6 and base band signal process circuit 7, described signal input part 1 is connected with described merit parallel circuit 3 by amplifier 2, gps satellite signal is divided into L1 by described merit parallel circuit 3, the signaling channel of L2 and L5 tri-frequency ranges, described L1 signaling channel is connected with described base band signal process circuit 7 with lower frequency changer circuit part 6 through described filtering circuit 4 successively, described L2 signaling channel and L5 signaling channel are respectively successively through described filtering circuit 4, up-converter circuit part 5 is connected with described base band signal process circuit 7 with lower frequency changer circuit part 6.
By described signal input part is connected with described merit parallel circuit by amplifier, gps satellite signal is divided into L1 by described merit parallel circuit, the signaling channel of L2 and L5 tri-frequency ranges, described L1 signaling channel is connected with described base band signal process circuit with lower frequency changer circuit part through described filtering circuit successively, described L2 signaling channel and L5 signaling channel are respectively successively through described filtering circuit, up-converter circuit part is connected with described base band signal process circuit with lower frequency changer circuit part, gps satellite signal is divided into L1 by merit parallel circuit, L2 and L5 tri-frequency band signals, all independent signal transacting is carried out to the gps satellite signal of each frequency range, wherein first upconversion process is carried out to L2 signaling channel and L5 signaling channel, reduce image interference, again independently down-converted is carried out to each frequency band signals and be converted to baseband signal, reduce the crosstalk between each satellite-signal, for baseband processing circuitry provides enough signal to noise ratio (S/N ratio)s.
In actual applications, described L1 signal frequency is 1575.42MHz, L2 signal frequency be 1227.6MHz, L5 signal frequency is 1176.45MHz.
In actual applications, described up-converter circuit part 5 comprises one-level local oscillation circuit 51 and frequency mixer 52, described one-level local oscillation circuit 51 is connected with described frequency mixer 52, and described L2 signaling channel is connected with described lower frequency changer circuit part 6 respectively by a frequency mixer 52 with L5 signaling channel.
In actual applications, described L2 signal frequency range and L5 signal frequency range up-convert to the frequency range of nearly L1 signal respectively by frequency mixer.Described L2 signal frequency range is 1569MHz after up-conversion, and described L5 signal frequency range is 1575MHz after up-conversion.
In actual applications, described one-level local oscillation circuit comprises start-oscillation circuit and loop filter.
In actual applications, the local oscillation signal frequency range that described one-level local oscillation circuit produces is 300MHz-400MHz.
In actual applications, described frequency mixer is image-reject mixer.
In actual applications, described lower frequency changer circuit part 6 comprises secondary local oscillation circuit 61, mixting circuit 62, wave filter 63 and ADC D/A converting circuit 64, described secondary local oscillation circuit 61 is connected with described mixting circuit 62, and described L1 signaling channel, L2 signaling channel are connected with described base band signal process circuit 7 through mixting circuit 62, wave filter 63 and ADC D/A converting circuit 64 respectively successively with L5 signaling channel.Described wave filter is intermediate-frequency filter, and its frequency is 18MHz.
In actual applications, AGC amplifying circuit 65 is also connected between described wave filter 63 and described ADC D/A converting circuit 64.
In actual applications, described L1 signaling channel produces the L1 new signal of nearly zero intermediate frequency by described mixting circuit synthesis, described L2 signaling channel produces the L2 new signal of nearly zero intermediate frequency by described mixting circuit synthesis, and L5 signaling channel produces the L5 new signal of nearly zero intermediate frequency by described mixting circuit synthesis.
In actual applications, the local oscillation signal frequency range that described secondary local oscillation circuit produces is 1545MHz-1615MHz.
The principle of work of the embodiment of the present invention is as follows:
Gps satellite signal enters circuit through signal input part, first through amplifier, gps satellite signal is carried out amplification process; Subsequently the gps satellite signal after amplification process is divided into the satellite-signal of L1, L2 and L5 tri-frequency ranges by one point of three merit parallel circuit, and the satellite-signal of these three frequency ranges is carried out filtering process; Upconversion process is carried out to the satellite-signal of L2 and L5 frequency range, is specially and the satellite-signal of L2 and L5 frequency range and local oscillation signal are carried out Frequency mixing processing, allow the signal of L2 and L5 frequency range be converted to the signal of nearly L1 frequency range; L2 with L5 band satellite signal after process is carried out I/Q respectively with L1 satellite-signal be separated, then synthesize the signal produced near zero intermediate frequency all respectively with high local oscillator carrier signal; Device filters after filtering, obtain pure zero intermediate frequency signals, carry out amplification by agc circuit to zero intermediate frequency signals again to process, the signal power strength that the enlargement factor of AGC obtains according to rear end Baseband algorithms adjusts, then carry out analog to digital conversion with high-speed ADC integrated circuit to the signal that AGC exports, the digital signal obtaining zero intermediate frequency is baseband signal.
Advantage of the invention process: circuit structure gps satellite signal being converted to baseband signal of the present invention is by being connected described signal input part with described merit parallel circuit by amplifier, gps satellite signal is divided into L1 by described merit parallel circuit, the signaling channel of L2 and L5 tri-frequency ranges, described L1 signaling channel is connected with described base band signal process circuit with lower frequency changer circuit part through described filtering circuit successively, described L2 signaling channel and L5 signaling channel are respectively successively through described filtering circuit, up-converter circuit part is connected with described base band signal process circuit with lower frequency changer circuit part, gps satellite signal is divided into L1 by merit parallel circuit, L2 and L5 tri-frequency band signals, all independent signal transacting is carried out to the gps satellite signal of each frequency range, image-reject mixer is wherein adopted to carry out upconversion process to L2 signaling channel and L5 signaling channel, reduce image interference, again independently down coversion is carried out to each frequency band signals, filtering, amplification and A/D are converted to baseband signal, reduce the crosstalk between each satellite-signal, for baseband processing circuitry provides enough signal to noise ratio (S/N ratio)s.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, the technician of any skilled is in technical scope disclosed by the invention; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (10)
1. gps satellite signal is converted to the circuit structure of baseband signal by one kind, it is characterized in that, described circuit structure gps satellite signal being converted to baseband signal comprises signal input part, amplifier, merit parallel circuit, filtering circuit, up-converter circuit part, lower frequency changer circuit part and base band signal process circuit, described signal input part is connected with described merit parallel circuit by amplifier, gps satellite signal is divided into L1 by described merit parallel circuit, the signaling channel of L2 and L5 tri-frequency ranges, described L1 signaling channel is connected with described base band signal process circuit with lower frequency changer circuit part through described filtering circuit successively, described L2 signaling channel and L5 signaling channel are respectively successively through described filtering circuit, up-converter circuit part is connected with described base band signal process circuit with lower frequency changer circuit part.
2. circuit structure gps satellite signal being converted to baseband signal according to claim 1, it is characterized in that, described up-converter circuit part comprises one-level local oscillation circuit and frequency mixer, described one-level local oscillation circuit is connected with described frequency mixer, and described L2 signaling channel is connected with described lower frequency changer circuit part respectively by a frequency mixer with L5 signaling channel.
3. circuit structure gps satellite signal being converted to baseband signal according to claim 2, is characterized in that, described L2 signal frequency range and L5 signal frequency range up-convert to the frequency range of nearly L1 signal respectively by frequency mixer.
4. circuit structure gps satellite signal being converted to baseband signal according to claim 2, is characterized in that, described one-level local oscillation circuit comprises start-oscillation circuit and loop filter.
5. circuit structure gps satellite signal being converted to baseband signal according to claim 2, is characterized in that, the local oscillation signal frequency range that described one-level local oscillation circuit produces is 300MHz-400MHz.
6. circuit structure gps satellite signal being converted to baseband signal according to claim 2, described frequency mixer is image-reject mixer.
7. according to circuit structure gps satellite signal being converted to baseband signal one of claim 1 to 6 Suo Shu, it is characterized in that, described lower frequency changer circuit part comprises secondary local oscillation circuit, mixting circuit, wave filter and ADC D/A converting circuit, described secondary local oscillation circuit is connected with described mixting circuit, and described L1 signaling channel, L2 signaling channel are connected with described base band signal process circuit through mixting circuit, wave filter and ADC D/A converting circuit respectively successively with L5 signaling channel.
8. circuit structure gps satellite signal being converted to baseband signal according to claim 7, is characterized in that, is also connected to AGC amplifying circuit between described wave filter and described ADC D/A converting circuit.
9. circuit structure gps satellite signal being converted to baseband signal according to claim 7, it is characterized in that, described L1 signaling channel produces the L1 new signal of nearly zero intermediate frequency by described mixting circuit synthesis, described L2 signaling channel produces the L2 new signal of nearly zero intermediate frequency by described mixting circuit synthesis, and L5 signaling channel produces the L5 new signal of nearly zero intermediate frequency by described mixting circuit synthesis.
10. circuit structure gps satellite signal being converted to baseband signal according to claim 7, is characterized in that, the local oscillation signal frequency range that described secondary local oscillation circuit produces is 1545MHz-1615MHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410855726.3A CN105259563A (en) | 2014-12-26 | 2014-12-26 | Circuit structure converting GPS satellite signal into baseband signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410855726.3A CN105259563A (en) | 2014-12-26 | 2014-12-26 | Circuit structure converting GPS satellite signal into baseband signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105259563A true CN105259563A (en) | 2016-01-20 |
Family
ID=55099324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410855726.3A Pending CN105259563A (en) | 2014-12-26 | 2014-12-26 | Circuit structure converting GPS satellite signal into baseband signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105259563A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106099298A (en) * | 2016-06-24 | 2016-11-09 | 西安电子科技大学 | Ultra broadband filter response power divider |
| CN107733465A (en) * | 2016-08-10 | 2018-02-23 | 中兴通讯股份有限公司 | Ultra-wide band signal processing method and device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020161522A1 (en) * | 2001-02-05 | 2002-10-31 | Clark Cohen | Low cost system and method for making dual band GPS measurements |
| US20040042562A1 (en) * | 2002-08-30 | 2004-03-04 | Richard Najarian | Frequency plan for GPS receiver |
| CN102520424A (en) * | 2011-12-16 | 2012-06-27 | 武汉大学 | Low intermediate frequency double-frequency dual mode GNSS receiver radio frequency front-end apparatus |
| CN203535230U (en) * | 2013-08-15 | 2014-04-09 | 上海司南卫星导航技术有限公司 | Radio frequency circuit structure capable of converting GNSS satellite signal to baseband signal |
-
2014
- 2014-12-26 CN CN201410855726.3A patent/CN105259563A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020161522A1 (en) * | 2001-02-05 | 2002-10-31 | Clark Cohen | Low cost system and method for making dual band GPS measurements |
| US20040042562A1 (en) * | 2002-08-30 | 2004-03-04 | Richard Najarian | Frequency plan for GPS receiver |
| CN102520424A (en) * | 2011-12-16 | 2012-06-27 | 武汉大学 | Low intermediate frequency double-frequency dual mode GNSS receiver radio frequency front-end apparatus |
| CN203535230U (en) * | 2013-08-15 | 2014-04-09 | 上海司南卫星导航技术有限公司 | Radio frequency circuit structure capable of converting GNSS satellite signal to baseband signal |
Non-Patent Citations (2)
| Title |
|---|
| "GPS L2 信号 USB 中频数据采集实验平台设计": ""GPS L2 信号 USB 中频数据采集实验平台设计"", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
| 王忠等: ""基于DSP+FPGA的多频GPS接收机系统设计"", 《计算机测量与控制》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106099298A (en) * | 2016-06-24 | 2016-11-09 | 西安电子科技大学 | Ultra broadband filter response power divider |
| CN106099298B (en) * | 2016-06-24 | 2019-03-26 | 西安电子科技大学 | Ultra wide band filter response power divider |
| CN107733465A (en) * | 2016-08-10 | 2018-02-23 | 中兴通讯股份有限公司 | Ultra-wide band signal processing method and device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4840323B2 (en) | Satellite positioning receiver | |
| US10101461B2 (en) | Radio frequency circuit structure for implementing function of converting GNSS satellite signal into baseband signal | |
| CN105549038B (en) | L1 and L2 two-band satellite navigation receiver RF front-end circuits | |
| US20100302100A1 (en) | Signal Processing Apparatus for Multi-mode Satellite Positioning System and Method Thereof | |
| EP1947777A2 (en) | Multi-band RF receiver | |
| US20130260775A1 (en) | Voice data rf gps integrated circuit | |
| US20060234652A1 (en) | Transmission apparatus, communication apparatus and mobile radio apparatus | |
| CN101908858B (en) | Method for processing broadband receiving digital front end | |
| US8022872B2 (en) | Positioning receiver | |
| CN106533529B (en) | Satellite two-way time comparison modulation and demodulation system and method | |
| CN104749591A (en) | Global navigation satellite system oriented multi-mode parallel radio-frequency receiver | |
| CN108521292A (en) | Ultra-broadband digital satellite beacon method of reseptance based on software radio and receiver | |
| CN101629996A (en) | Radio frequency structure for realizing function of switching dual-band GPS satellite signal into base band signal | |
| CN102540219A (en) | Receiving method and receiver for signal of global navigation satellite system | |
| CN102243313A (en) | Dual-channel radio frequency receiver and frequency planning method thereof | |
| US10228469B2 (en) | Reception device | |
| CN102243308A (en) | Single-channel radiofrequency receiver and frequency planning method thereof | |
| CN104297768A (en) | Front-end system capable of simultaneously receiving GPS signals and Beidou second-generation signals and application of front-end system | |
| CN104734640A (en) | Frequency changing circuit and receiver board | |
| US20220299653A1 (en) | Radio frequency receiver for simultaneously processing multiple types of signals for positioning and method of operation | |
| CN104459735A (en) | Beidou-based high-precision differential service receiving device | |
| CN103364810B (en) | By can saltus step navigation frequency point realize satellite navigation location devices and methods therefor | |
| CN105259563A (en) | Circuit structure converting GPS satellite signal into baseband signal | |
| CN105277956A (en) | Method for converting GPS satellite signal to baseband signal | |
| US8280340B2 (en) | Clock generation for integrated radio frequency receivers |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160120 |
|
| RJ01 | Rejection of invention patent application after publication |