CN103792549A - Radio frequency receiver of Beidou I satellite navigation system - Google Patents
Radio frequency receiver of Beidou I satellite navigation system Download PDFInfo
- Publication number
- CN103792549A CN103792549A CN201310078644.8A CN201310078644A CN103792549A CN 103792549 A CN103792549 A CN 103792549A CN 201310078644 A CN201310078644 A CN 201310078644A CN 103792549 A CN103792549 A CN 103792549A
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- China
- Prior art keywords
- frequency
- radio frequency
- signal
- receiver
- frequency signal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/21—Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/37—Hardware or software details of the signal processing chain
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Superheterodyne Receivers (AREA)
Abstract
The invention relates to a radio frequency receiver, particularly to a radio frequency receiver of a Beidou I satellite navigation system. The twice frequency conversion structure is used; the radio frequency single-terminal inputting is carried out and a digital intermediate-frequency signal is outputted directly. Amplification is carried out by a low-noise amplifier; a first-stage mixer carries out down conversion on a radio frequency signal to obtain a first intermediate-frequency signal; after filtering, the first intermediate-frequency signal is processed by frequency conversion by a second-stage mixer to obtain a final intermediate-frequency signal; and a variable gain amplifier carries out amplification and an ADC unit carries out sampling so as to generate digital intermediate-frequency signals including an amplitude bit signal and a symbol bit signal for outputting. The receiver includes the low-noise amplifier, the two-stage mixers, the first-stage variable gain amplifier, the filter, and the 2-bit ADC circuit and is characterized in that the radio frequency input employs the single-terminal mode and the mixers use the differential way; and the digital intermediate-frequency signal is outputted directly. The provided receiver has the following advantages: because of the radio frequency single-terminal input, the radio frequency matching can be realized conveniently; the differential mixer enables interference signals like local oscillator leakage and power noises and the like to be effectively inhibited; the digital intermediate-frequency signal is outputted; and direction connection with a baseband processing circuit can be realized conveniently.
Description
Technical field
The present invention relates to a kind of radio-frequency transmitter, a kind of Beidou I navigation system is with the radio-frequency transmitter of digital intermediate frequency output specifically.
Background technology
The U.S. and Russia build up GPS (Global Position System) GPS and GLONASS in succession, and European Union is carrying out GALILEO system Construction at present.In order to set up independent China Satecom navigational system, two satellites of Big Dipper navigation positioning system have been succeeded in sending up in 2000, indicate that China's Satellite Navigation Technique makes a breakthrough, make China become in the world the 3rd country that has autonomous satellite navigational system.Different from GPS, Beidou satellite navigation system is active bidirectional ranging two dimensional navigation.Dipper system is made up of parts such as two geostationary satellites, central control system, Calibration System and all types of user machines.First send interrogating signal by central control system to two satellites simultaneously, broadcast to the user in service area through satellite repeater.The wherein interrogating signal of a satellite of user's response, and send response signal to two satellites simultaneously, be forwarded back to central control system through satellite.The signal that central control system receives and demodulation user sends, then carries out corresponding data processing according to the application service content of use.Dipper system has following major function: (1) location: determine fast the on-site geographic position of user, provide navigation information to user and competent authorities; (2) communication: all can realize two-way brief digital message communication between user and user, user and central control system; (3) time service: central control system broadcasting on schedule time service information, for timing user provides time delay modified value.
Current, the radio-frequency module of Big Dipper terminal all adopts discrete device to design, and causes system debug difficulty, and small product size is huge, and the utmost point is unfavorable for carrying.Meanwhile, part key chip is all to depend on external import, and cost is very high.All of these factors taken together has all hindered the development of dipper system and has popularized.
Mostly current receiver of the Big Dipper is to adopt single-conversion structure, cause mirror image rejection poor, even if some receiver adopts double conversion structure, but the first intermediate-freuqncy signal frequency of these double conversion structures is high, generally, in 800MHz left and right, must designs two frequency synthesizers two-stage local oscillation signal is provided respectively, cause system complex, power consumption is high, and between local oscillator, the problem such as serious interference, is more not easy to integrated chip.
Current Big Dipper generation receiver generally adopts analog intermediate frequency output, then converts by ADC, changes into digital signal, then delivers to baseband processing circuitry and process.Current Big Dipper generation receiving chip is also is mostly to adopt analog if signal output.
Summary of the invention
Technical matters to be solved by this invention is: the shortcoming existing for above prior art, a kind of radio-frequency receiver of Beidou I navigation system is proposed, the output of support digital medium-frequency signal, can improve the mirror image rejection of radio-frequency receiver of Beidou I navigation system simultaneously, avoid the phase mutual interference between many local oscillation signals, reduce power consumption, reduce circuit quantity, reduce costs, make receiver be easier to integrated chip.
The technical scheme that the present invention solves above technical matters is:
Radio-frequency receiver of Beidou I navigation system, comprises low noise amplifier, two mixer stages, bandpass filter, intermediate frequency variable gain amplifier, 2 adc circuits.First radio-frequency input signals amplifies through low noise amplifier, be down to the first intermediate-freuqncy signal by first order frequency mixer, the first intermediate-freuqncy signal inputs to variable gain amplifier after band-pass filter, and then downconvert to final intermediate-frequency by second level frequency mixer, final intermediate-frequency is amplified through variable gain amplifier, finally by 2 adc circuit sampling outputs, generation amplitude position and sign bit.
Advantage of the present invention is: radio-frequency input signals of the present invention adopts single-ended input, facilitates radio-frequency match; The output of first order frequency mixer and the input of second level frequency mixer adopt difference form, are conducive to suppress undesired signal; Intermediate-freuqncy signal is after 2 adc circuit samplings, and output amplitude position signal and sign bit signal, can directly be connected with baseband circuit, simplifies radio circuit and the direct interface of baseband circuit.
Accompanying drawing explanation
Fig. 1 is receiver block diagram of the present invention.
Fig. 2 is that application of the present invention connects block diagram.
Embodiment
Embodiment mono-
As seen from Figure 1, first radio-frequency input signals amplifies through low noise amplifier, be down to the first intermediate-freuqncy signal by first order frequency mixer, the first intermediate-freuqncy signal inputs to second level frequency mixer after band-pass filter, downconvert to final intermediate-frequency, final intermediate-frequency is amplified through intermediate frequency variable gain amplifier again, is exported by generation amplitude position and sign bit after ADC sampling.
Low noise amplifier adopts single-ended input form, is then transformed into difference form, and first order frequency mixer and second level frequency mixer all adopt difference form, can effectively suppress the undesired signal such as local oscillator leakage, power supply noise.
As seen from Figure 2, amplitude position and sign bit signal that the ADC in the present invention produces can be directly inputted into baseband circuit, no longer need extra high-precision adc module.Saved a lot of circuit, convenient debugging, greatly reduces system power dissipation and cost.
The present invention can also have other embodiment, and the technical scheme that the equal replacement of all employings or equivalent transformation form, within all dropping on the scope of protection of present invention.
Claims (2)
1. radio-frequency receiver of Beidou I navigation system, comprise low noise amplifier, first order frequency mixer, bandpass filter, second level frequency mixer, intermediate frequency variable gain amplifier and ADC, it is characterized in that: low noise amplifier adopts single-ended input form, two mixer stages adopts differential input and output form; First radio-frequency input signals amplifies through low noise amplifier, be down to the first intermediate-freuqncy signal by first order frequency mixer, the first intermediate-freuqncy signal inputs to second level frequency mixer and downconverts to final intermediate-frequency after band-pass filter, final intermediate-frequency is amplified through intermediate frequency variable gain amplifier, produces digital medium-frequency signal export by adc circuit sampling.
2. radio-frequency receiver of Beidou I navigation system as claimed in claim 1, is characterized in that: described adc circuit produces amplitude position signal and sign bit signal, can directly be connected with baseband processing circuitry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310078644.8A CN103792549A (en) | 2013-03-05 | 2013-03-05 | Radio frequency receiver of Beidou I satellite navigation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310078644.8A CN103792549A (en) | 2013-03-05 | 2013-03-05 | Radio frequency receiver of Beidou I satellite navigation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103792549A true CN103792549A (en) | 2014-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310078644.8A Pending CN103792549A (en) | 2013-03-05 | 2013-03-05 | Radio frequency receiver of Beidou I satellite navigation system |
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| CN (1) | CN103792549A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106657940A (en) * | 2016-12-02 | 2017-05-10 | 安徽波维电子科技有限公司 | Multistage frequency-conversion tuner |
| CN108233930A (en) * | 2017-12-18 | 2018-06-29 | 兰州理工大学 | A kind of sample circuit and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101783701A (en) * | 2010-01-08 | 2010-07-21 | 南京广嘉微电子有限公司 | Radio-frequency receiver of Beidou I navigation system |
| CN102096079A (en) * | 2009-12-12 | 2011-06-15 | 杭州中科微电子有限公司 | Method for constructing radio frequency front end of multi-mode multi-band satellite navigation receiver and module thereof |
| CN102540203A (en) * | 2010-12-17 | 2012-07-04 | 北京广嘉创业电子技术有限公司 | Radio frequency receiver of number-one Beidou satellite navigation system |
-
2013
- 2013-03-05 CN CN201310078644.8A patent/CN103792549A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102096079A (en) * | 2009-12-12 | 2011-06-15 | 杭州中科微电子有限公司 | Method for constructing radio frequency front end of multi-mode multi-band satellite navigation receiver and module thereof |
| CN101783701A (en) * | 2010-01-08 | 2010-07-21 | 南京广嘉微电子有限公司 | Radio-frequency receiver of Beidou I navigation system |
| CN102540203A (en) * | 2010-12-17 | 2012-07-04 | 北京广嘉创业电子技术有限公司 | Radio frequency receiver of number-one Beidou satellite navigation system |
Non-Patent Citations (1)
| Title |
|---|
| 杨逢宇等: "北斗卫星导航系统中频信号的产生方法", 《海军航空工程学院学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106657940A (en) * | 2016-12-02 | 2017-05-10 | 安徽波维电子科技有限公司 | Multistage frequency-conversion tuner |
| CN108233930A (en) * | 2017-12-18 | 2018-06-29 | 兰州理工大学 | A kind of sample circuit and method |
| CN108233930B (en) * | 2017-12-18 | 2020-09-22 | 兰州理工大学 | Sampling circuit and method |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| DD01 | Delivery of document by public notice |
Addressee: BGMICRO ELECTRONICS CO., LTD. Document name: Notification that Application Deemed to be Withdrawn |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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Application publication date: 20140514 |