CN204694850U - The radio-frequency transmitter of the Big Dipper No. two satellite navigation system channel structures - Google Patents
The radio-frequency transmitter of the Big Dipper No. two satellite navigation system channel structures Download PDFInfo
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- CN204694850U CN204694850U CN201520334016.6U CN201520334016U CN204694850U CN 204694850 U CN204694850 U CN 204694850U CN 201520334016 U CN201520334016 U CN 201520334016U CN 204694850 U CN204694850 U CN 204694850U
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Abstract
The utility model relates to a kind of channel structure radio-frequency transmitter, a kind of Big Dipper No. two satellite navigation system radio-frequency transmitters, adopt two covers completely independently receiving cable circuit, can receive B1 and B2 or B1 and B3 frequency, the analog intermediate frequency of generation is directly connected with rear class adc circuit, Big Dipper baseband circuit simultaneously.Each passage have employed double conversion structure, radio frequency single ended input, direct output digital medium-frequency signal, first amplified by low noise amplifier, by first order frequency mixer, radiofrequency signal is down-converted to the first intermediate-freuqncy signal, after filtering, the first intermediate-freuqncy signal is converted to final intermediate-frequency by second level frequency mixer again, then amplified and automatic gain control circuit by variable gain amplifier, produce intermediate-freuqncy signal and export.Receiver comprises two completely independently receiving cables, and wherein each receiving cable comprises low noise amplifier, two mixer stages, one-level variable gain amplifier and wave filter, agc circuit etc.Receiver is characterised in that radio frequency input adopts single-ended format, and frequency mixer adopts difference form, directly exports intermediate-freuqncy signal.Its advantage is: radio frequency single ended input facilitates radio-frequency match, and differential mixer can effectively suppress the undesired signal such as local oscillator leakage and power supply noise, exports intermediate-freuqncy signal, can be convenient to directly be connected with rear class adc circuit, baseband processing circuitry.
Description
Technical field
The present invention relates to a kind of radio-frequency transmitter, specifically the radio-frequency transmitter of a kind of Big Dipper No. two satellite navigation system channel structures.
Background technology
The Big Dipper No. two satellite navigation systems are GPS (Global Position System) of China's independent research, are and GPS of America, Russian GLONASS, European Union GALILEO system one of four Iarge-scale system deposited.The Big Dipper No. two system signals comprise B1, B2 and B3 tri-frequencies, and wherein B1, B2 are civil frequency, and B3 is military frequency.The Big Dipper chip only receiving B1 signal is mainly used in the civil navigation industry of meter accuracy, want to be accurate to decimeter grade or centimetre-sized, Big Dipper chip needs the signal simultaneously resolving B1, B2 two frequencies, if can accept B3 signal, the precision of location and efficiency will promote further.
In order to meet proprietary application and the requirements of special industry application navigator fix such as dual-use, high-acruracy survey, the Receiver Module of the Big Dipper No. two terminals needs to be designed to channel structure, can receive B1 and B2 or B1 and B3 frequency simultaneously.Current, the Big Dipper No. two receivers all adopt discrete device to design, and cause system debug difficulty, small product size is huge, and pole is unfavorable for carrying.And the current Big Dipper No. two receivers adopt and are mostly single-pass configuration, and adopt single-conversion structure, and cause integrated level low, mirror image rejection is poor.Meanwhile, Partial key chip is all depend on external import, and cost is very high.All of these factors taken together all hinders the development of dipper system and popularizes.The miniaturization of Big Dipper terminal part, chip welcomes preferably opportunity.
Mostly current Beidou II receiving chip is to adopt analog if signal to export, and is then converted by ADC, changes into digital signal, then deliver to baseband processing circuitry and process.
Summary of the invention
Technical matters to be solved by this invention is: the shortcoming existed for above prior art, a kind of Big Dipper No. two satellite navigation system binary channels radio-frequency transmitters are proposed, improve the mirror image rejection of the Big Dipper No. two satellite navigation system radio-frequency transmitters, improve chip integration, reduce power consumption, reduce peripheral circuit quantity, reduce costs, make receiver be easier to integrated chip.
The technical scheme that the present invention solves above technical matters is:
The Big Dipper No. two satellite navigation system binary channels radio-frequency transmitters, comprise two independently receiving cables, receive B1 and B2 or B1 and B3 frequency respectively.Because B2 and B3 frequency is close, B2 and B3 shares a passage.Each passage has independently low noise amplifier, two mixer stages, bandpass filter, intermediate frequency variable gain amplifier.First the radio-frequency input signals of each passage amplifies through the low noise amplifier of each passage, the first intermediate-freuqncy signal is down to by first order frequency mixer, first intermediate-freuqncy signal inputs to variable gain amplifier after band-pass filter, and then downconverting to final intermediate-frequency by second level frequency mixer, final intermediate-frequency is amplified through variable gain amplifier and automatic gain amplifier (AGC).
Advantage of the present invention is: the present invention adopts dual channel receiver structure receiver, can receive B1 and B2 or B1 and B3 frequency simultaneously, reduce module volume, improve integrated level.Radio-frequency input signals adopts single ended input, facilitates radio-frequency match; First order frequency mixer exports and frequency mixer input in the second level adopts difference form, is conducive to suppressing undesired signal, and adds the inhibiting bandpass filter of mirror image.
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 one
As seen from Figure 1, B1, B2 or B3 radio-frequency input signals amplifies respectively through the low noise amplifier of respective passage, the first intermediate-freuqncy signal is down to by first order frequency mixer, 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 IF AGC control circuit (AGC) and variable gain amplifier again, exports to rear class adc circuit and Big Dipper baseband processing circuitry.
Low noise amplifier adopts single ended input form, and be then transformed into difference form, 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, the channel structure receiver in the present invention, can simultaneously treatments B 1 and B2 or B1 and B3 frequency, saves a lot of peripheral circuit.The intermediate-freuqncy signal exported directly connects ADC and the Big Dipper No. two baseband processing circuitries of rear class, and convenient debugging, greatly reduces system power dissipation and cost.
The present invention can also have other embodiment, and the technical scheme that all employings are replaced on an equal basis or equivalent transformation is formed, all drops within the scope of protection of present invention.
Claims (3)
1. the Big Dipper No. two satellite navigation system channel structure radio-frequency transmitters, comprise two and overlap independently low noise amplifier, first order frequency mixer, the first if bandpas filter, second level frequency mixer, intermediate frequency variable gain amplifier and agc circuit, it is characterized in that: adopt two completely independently receiving cable respectively treatments B 1 frequency and B2 frequency or B1 frequency and B3 frequencies, greatly save peripheral circuit, improve the integrated level of module.
2. the Big Dipper No. two satellite navigation system channel structure radio-frequency transmitters as claimed in claim 1, it is characterized in that: low noise amplifier adopts single ended input form, exports and is connected with first order frequency mixer, two mixer stages adopts differential input and output form; First order mixer output is connected with the first if bandpas filter, and then wave filter exports and is connected to second level frequency mixer, and second level frequency mixer exports and is connected with intermediate frequency variable gain amplifier, and final intermediate-frequency amplifies output through intermediate frequency variable gain amplifier.
3. the Big Dipper No. two satellite navigation system channel structure radio-frequency transmitters as claimed in claim 1, it is characterized in that: B1 frequency and B2 frequency or B1 frequency and B3 frequency radio-frequency input signals can be received simultaneously, produce respective intermediate frequency, can directly be connected with baseband processing circuitry with rear class adc circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520334016.6U CN204694850U (en) | 2015-05-22 | 2015-05-22 | The radio-frequency transmitter of the Big Dipper No. two satellite navigation system channel structures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201520334016.6U CN204694850U (en) | 2015-05-22 | 2015-05-22 | The radio-frequency transmitter of the Big Dipper No. two satellite navigation system channel structures |
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| CN204694850U true CN204694850U (en) | 2015-10-07 |
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| CN201520334016.6U Expired - Fee Related CN204694850U (en) | 2015-05-22 | 2015-05-22 | The radio-frequency transmitter of the Big Dipper No. two satellite navigation system channel structures |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106597485A (en) * | 2016-12-13 | 2017-04-26 | 中国电子科技集团公司第二十研究所 | Beidou satellite navigation equipment interference resistance performance test system |
| CN107645344A (en) * | 2016-07-20 | 2018-01-30 | 特克特朗尼克公司 | Multiband noise reduction system and method |
| CN111224683A (en) * | 2019-12-30 | 2020-06-02 | 北斗航天卫星应用科技集团有限公司 | Low-noise large dynamic radio frequency receiving channel |
-
2015
- 2015-05-22 CN CN201520334016.6U patent/CN204694850U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107645344A (en) * | 2016-07-20 | 2018-01-30 | 特克特朗尼克公司 | Multiband noise reduction system and method |
| CN107645344B (en) * | 2016-07-20 | 2021-05-04 | 特克特朗尼克公司 | Multi-band noise reduction system and method |
| CN106597485A (en) * | 2016-12-13 | 2017-04-26 | 中国电子科技集团公司第二十研究所 | Beidou satellite navigation equipment interference resistance performance test system |
| CN111224683A (en) * | 2019-12-30 | 2020-06-02 | 北斗航天卫星应用科技集团有限公司 | Low-noise large dynamic radio frequency receiving channel |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151007 Termination date: 20160522 |
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| CF01 | Termination of patent right due to non-payment of annual fee |