CN102540203A - Radio frequency receiver of number-one Beidou satellite navigation system - Google Patents
Radio frequency receiver of number-one Beidou satellite navigation system Download PDFInfo
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- CN102540203A CN102540203A CN2010105936382A CN201010593638A CN102540203A CN 102540203 A CN102540203 A CN 102540203A CN 2010105936382 A CN2010105936382 A CN 2010105936382A CN 201010593638 A CN201010593638 A CN 201010593638A CN 102540203 A CN102540203 A CN 102540203A
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Abstract
The invention relates to a radio frequency receiver, in particular to a radio frequency receiver of a number-one Beidou satellite navigation system. A twice-frequency-conversion structure is adopted, at first, a radio frequency front-end circuit converts a radio frequency signal into a first intermediate frequency signal in a down-conversion manner, and after being filtered, the first intermediate frequency signal is then converted into an ultimate intermediate frequency signal to be outputted in a down-conversion manner. The radio frequency receiver comprises a low-noise amplifier, a two-stage down-conversion device, a two-stage variable gain amplifier, a filter, an oscillator and a phase-locked loop, and the oscillator generates two-stage local oscillator signals. The receiver is characterized in that frequency planning is reasonable, and a twice frequency conversion function can be realized only by the aid of the oscillator and the phase-locked loop. The radio frequency receiver has the advantages that only the oscillator and the phase-locked loop are required for twice frequency conversion, mutual interference of a plurality of phase-locked rings is avoided, the quantity of circuits is reduced, the volume is reduced, the cost is lowered, and integration of chips is easy.
Description
Technical field
The present invention relates to a kind of radio-frequency transmitter, a kind of specifically radio-frequency receiver of Beidou I navigation system.
Background technology
The U.S. and Russia build up GPS GPS and GLONASS in succession, and European Union is carrying out the construction of GALILEO system at present.In order to set up independent China Satecom navigational system; Two satellites of Big Dipper navigation positioning system have successfully been launched in 2000; Indicate that China's satellite navigation technology makes a breakthrough, make China become the 3rd country that has the autonomous satellite navigational system in the world.Different with GPS, Beidou satellite navigation system is active bidirectional ranging two dimensional navigation.Dipper system partly is made up of two geostationary satellites, central control system, calibration system and all types of user machine etc.At first send interrogating signal simultaneously to two satellites, through the users broadcasting of satellite repeater in service area by central control system.User's response is the interrogating signal of a satellite wherein, and simultaneously to two satellite transmission response signals, transmits back central control system through satellite.The signal that central control system receives and the demodulation user sends carries out corresponding data processing according to the application service content of usefulness then.Dipper system has following major function: ⑴ location: confirming fast provides navigation information to user and competent authorities in the on-site geographic position of user; ⑵ communication: all can realize two-way brief digital message communication between user and user, user and central control system; ⑶ time service: central control system broadcasting on schedule time service information, for the timing user provides the time delay modified value.
Current, the radio-frequency module at Big Dipper terminal all adopts discrete device to design, and causes the system debug difficulty, and small product size is huge, and the utmost point is unfavorable for carrying.Simultaneously, the part key chip all is 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 receiver of the present Big Dipper is to adopt the single-conversion structure, causes the mirror image rejection poor, even some receiver adopts the double conversion structure; But the first intermediate-freuqncy signal frequency of these double conversion structures is high, generally about 800MHz, must design two frequency synthesizers the two-stage local oscillation signal is provided respectively; Cause system complex; Power consumption is high, problem such as serious interference between local oscillator, and it is integrated more to be not easy to chip.
Summary of the invention
Technical matters to be solved by this invention is: to the shortcoming of above prior art existence; Propose a kind of radio-frequency receiver of Beidou I navigation system, can improve the mirror image rejection of radio-frequency receiver of Beidou I navigation system, avoid the phase mutual interference between many local oscillation signals; Reduce power consumption; Reduce circuit quantity, reduce cost, it is integrated to make receiver be easier to chip.
The technical scheme that the present invention solves above technical matters is:
Radio-frequency receiver of Beidou I navigation system; Comprise low noise amplifier, two-stage low-converter, two-stage variable gain amplifier and wave filter; Also comprise a voltage controlled oscillator and a phaselocked loop that produces the two-stage local oscillation signal, first local oscillation signal that voltage controlled oscillator produces is passed to first order low-converter, and second local oscillation signal of generation is passed to second level low-converter; Phaselocked loop links to each other with voltage controlled oscillator, and the voltage controlled oscillator output frequency is locked on the first local oscillation signal frequency; Radio-frequency input signals at first amplifies through low noise amplifier; Reduce to first intermediate-freuqncy signal by first order low-converter; First intermediate-freuqncy signal inputs to variable gain amplifier through after the band-pass filter; And then downconverting to final intermediate-frequency through second level low-converter, final intermediate-frequency is exported through low-pass filter and variable gain amplifier successively.
Satellite navigation system radio-frequency transmitter of the present invention adopts the double conversion structure, and twice low-converter all adopts high local oscillator, and the local oscillation signal frequency is higher than radio frequency signal frequency.First local oscillation signal is divided by 12 or obtain second local oscillation signal divided by 15.
Advantage of the present invention is: frequency planning of the present invention is reasonable, adopts an oscillator and phaselocked loop just can realize the double conversion function, second local oscillation signal by first local oscillation signal divided by 12 or obtain divided by 15.Double conversion only needs an oscillator and phaselocked loop, has avoided the phase mutual interference between a plurality of phaselocked loops, has reduced circuit quantity, has dwindled volume, has reduced cost, and it is integrated to be easy to chip.
Description of drawings
Fig. 1 is a passage block diagram of the present invention.
Fig. 2 is the circuit block diagram that two-stage local oscillator of the present invention produces.
Fig. 3 is a connection block diagram of the present invention.
Embodiment
Embodiment one
Visible by Fig. 1; Radio-frequency input signals at first amplifies through low noise amplifier LNA; Reduce to first intermediate-freuqncy signal by low-converter MIXER1; Input to variable gain amplifier VGA1 after first intermediate-freuqncy signal process BPF. IF1 BPF filtering, and then downconvert to final intermediate-frequency through low-converter MIXER2, final intermediate-frequency is successively through low-pass filter LPF and variable gain amplifier VGA2 output.RFIN is a radio-frequency input signals among the figure, and IFOUT is final intermediate frequency output signal, and LO1 is the local oscillator input signal of low-converter MIXER1, and LO2 is the local oscillator input signal of low-converter MIXER2.The two-stage low-converter all adopts high local oscillator, and promptly the LO1 signal frequency is higher than the RFIN signal frequency, and the LO2 signal frequency is higher than the first intermediate-freuqncy signal frequency.Because the first intermediate-freuqncy signal frequency is higher, the mirror image undesired signal of this receiver can obtain good restraining.
Visible by Fig. 2, voltage controlled oscillator VCO produces the first local oscillation signal LO1, and the first local oscillation signal LO1 produces the second local oscillation signal LO2 through 12 frequency divisions or 15 frequency divisions (DIV12/DIV15) back, and promptly the LO1 signal frequency is 12 times or 15 times of LO2 signal frequency.Phase-locked loop circuit PLL is locked on the LO1 signal frequency voltage controlled oscillator output frequency.
Visible by Fig. 3; Radio-frequency receiver of Beidou I navigation system of the present invention only needs a voltage controlled oscillator VCO and a phase-locked loop pll just can realize twice mixing; Traditional radio-frequency receiver of Beidou I navigation system than needing two cover voltage controlled oscillators and two cover phaselocked loops has been saved a lot of circuit; Both avoid the phase mutual interference between a plurality of voltage controlled oscillators, reduced circuit quantity again, greatly reduced system power dissipation and cost.
The present invention can also have other embodiment, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops within the scope of requirement protection of the present invention.
Claims (3)
1. radio-frequency receiver of Beidou I navigation system; Comprise low noise amplifier, two-stage low-converter, two-stage variable gain amplifier and wave filter; It is characterized in that: also comprise a voltage controlled oscillator and a phaselocked loop that produces the two-stage local oscillation signal; First local oscillation signal that said voltage controlled oscillator produces is passed to first order low-converter; Second local oscillation signal that produces is passed to second level low-converter, and said phaselocked loop links to each other with voltage controlled oscillator, and the voltage controlled oscillator output frequency is locked on the first local oscillation signal frequency; Radio-frequency input signals at first amplifies through low noise amplifier; Reduce to first intermediate-freuqncy signal by first order low-converter; First intermediate-freuqncy signal inputs to variable gain amplifier through after the band-pass filter; And then downconverting to final intermediate-frequency through second level low-converter, final intermediate-frequency is exported through low-pass filter and variable gain amplifier successively.
2. radio-frequency receiver of Beidou I navigation system as claimed in claim 1 is characterized in that: said twice low-converter all adopts high local oscillator, and the local oscillation signal frequency is higher than radio frequency signal frequency.
3. radio-frequency receiver of Beidou I navigation system as claimed in claim 1 is characterized in that: said first local oscillation signal is divided by 12 or obtain second local oscillation signal divided by 15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105936382A CN102540203A (en) | 2010-12-17 | 2010-12-17 | Radio frequency receiver of number-one Beidou satellite navigation system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105936382A CN102540203A (en) | 2010-12-17 | 2010-12-17 | Radio frequency receiver of number-one Beidou satellite navigation system |
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| CN102540203A true CN102540203A (en) | 2012-07-04 |
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| CN2010105936382A Pending CN102540203A (en) | 2010-12-17 | 2010-12-17 | Radio frequency receiver of number-one Beidou satellite navigation system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102937715A (en) * | 2012-10-09 | 2013-02-20 | 桂林电子科技大学 | BD1 (Beidou 1) and BD2 radio frequency compatible receiving method and device |
| CN103792549A (en) * | 2013-03-05 | 2014-05-14 | 南京波格微电子有限公司 | Radio frequency receiver of Beidou I satellite navigation system |
| CN104765043A (en) * | 2015-03-17 | 2015-07-08 | 广东工业大学 | High-integration satellite navigation continuously-operating reference station |
| CN105137458A (en) * | 2015-07-24 | 2015-12-09 | 北京星地恒通信息科技有限公司 | Beidou-1 reception channel based on GPS radio frequency chip |
| CN113552604A (en) * | 2021-07-26 | 2021-10-26 | 深圳市电咖测控科技有限公司 | Signal amplification circuit for GNSS receiver and receiver thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7616705B1 (en) * | 2000-07-27 | 2009-11-10 | Sirf Technology Holdings, Inc. | Monolithic GPS RF front end integrated circuit |
| CN201508412U (en) * | 2009-06-16 | 2010-06-16 | 广州市圣大电子有限公司 | Receiver for Beidou satellite navigation and positioning system |
| 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 |
| CN201600457U (en) * | 2010-01-08 | 2010-10-06 | 南京广嘉微电子有限公司 | Radio-frequency receiver of beidou-I satellite navigation system |
-
2010
- 2010-12-17 CN CN2010105936382A patent/CN102540203A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7616705B1 (en) * | 2000-07-27 | 2009-11-10 | Sirf Technology Holdings, Inc. | Monolithic GPS RF front end integrated circuit |
| CN201508412U (en) * | 2009-06-16 | 2010-06-16 | 广州市圣大电子有限公司 | Receiver for Beidou satellite navigation and positioning system |
| 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 |
| CN201600457U (en) * | 2010-01-08 | 2010-10-06 | 南京广嘉微电子有限公司 | Radio-frequency receiver of beidou-I satellite navigation system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102937715A (en) * | 2012-10-09 | 2013-02-20 | 桂林电子科技大学 | BD1 (Beidou 1) and BD2 radio frequency compatible receiving method and device |
| CN103792549A (en) * | 2013-03-05 | 2014-05-14 | 南京波格微电子有限公司 | Radio frequency receiver of Beidou I satellite navigation system |
| CN104765043A (en) * | 2015-03-17 | 2015-07-08 | 广东工业大学 | High-integration satellite navigation continuously-operating reference station |
| CN105137458A (en) * | 2015-07-24 | 2015-12-09 | 北京星地恒通信息科技有限公司 | Beidou-1 reception channel based on GPS radio frequency chip |
| CN113552604A (en) * | 2021-07-26 | 2021-10-26 | 深圳市电咖测控科技有限公司 | Signal amplification circuit for GNSS receiver and receiver thereof |
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Application publication date: 20120704 |