CN205356314U - Ultrashort wave radio station received signal treatment circuit - Google Patents
Ultrashort wave radio station received signal treatment circuit Download PDFInfo
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- CN205356314U CN205356314U CN201620031349.6U CN201620031349U CN205356314U CN 205356314 U CN205356314 U CN 205356314U CN 201620031349 U CN201620031349 U CN 201620031349U CN 205356314 U CN205356314 U CN 205356314U
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Abstract
The utility model discloses an ultrashort wave radio station received signal treatment circuit, this circuit comprises first detector, intermediate frequency snubber circuit, a crystal filter, IF amplifier, the 2nd crystal filter, demodulator, pilot frequency detection circuitry, third wave filter, baseband signal amplifier and self checking circuit, the first detector carry to intermediate frequency snubber circuit by the output after carrying out the mixing with received radiofrequency signal with the local oscillator signal received, intermediate frequency snubber circuit buffering back is by an output input crystal filter, a crystal filter imports the IF amplifier by the output after carrying out the narrow -band filtering to intermediate frequency signal, the demodulator is inputed by the output after carrying out the three -stage amplifier to intermediate frequency signal to the IF amplifier, the demodulator both way junction has the 2nd crystal filter, the demodulator with the intermediate frequency signal secondary amplify with the intermediate frequency signal of post -filter by output input baseband signal amplifier, respectively by three line outputs after the baseband signal amplifier amplifies baseband signal.
Description
Technical field:
This utility model relates to a kind of ultrashort wave radio set and receives signal processing circuit, is particularly well-suited to wireless electronic communication field.
Background technology:
Current radio communication, the wireless signal that receiver receives is the sophisticated signal that a kind of noise is high, power is low, receiving processing circuit needs to extract baseband signal from these sophisticated signals, therefore the performance receiving circuit directly affects the performance of whole wireless communication system, tuning signal is simply carried out filter and amplification once by traditional reception signal processing circuit before demodulation, thus being difficult to ensure that the reliable and stable of circuit.
Summary of the invention:
Task of the present utility model is to provide a kind of energy monitor in real time and receives a kind of ultrashort wave radio set reception signal processing circuit of the signal intensity of signal, the significantly high reliability and stability that ensure communication safety reliably, have.
Task of the present utility model so completes, a kind of ultrashort wave radio set receives signal processing circuit, it is characterized in that: this circuit is by frequency mixer, intermediate frequency buffer circuit, first crystal wave filter, intermediate frequency amplifier, second crystal filter, demodulator, pilot detection circuit, 3rd wave filter, baseband signal amplifier and self-checking circuit are constituted, described frequency mixer is delivered to intermediate frequency buffer circuit by outfan after the radiofrequency signal received being mixed with the local oscillation signal received, first crystal wave filter is inputted by outfan after described intermediate frequency buffer circuit buffering, described first crystal wave filter is inputted intermediate frequency amplifier by outfan after intermediate-freuqncy signal is carried out narrow-band filtering, described intermediate frequency amplifier is inputted demodulator by outfan after intermediate-freuqncy signal carries out three grades of amplifications, described demodulator has been bi-directionally connected the second crystal filter, intermediate-freuqncy signal secondary is amplified by demodulator and filtered intermediate-freuqncy signal is inputted baseband signal amplifier by outfan, described baseband signal amplifier is exported by three-line after baseband signal being amplified respectively, article one, circuit is exported baseband signal by the outfan of baseband signal amplifier, Article 2 circuit is inputted self-checking circuit by the outfan of baseband signal, Article 3 circuit is inputted the 3rd wave filter by the outfan of baseband signal amplifier, described 3rd wave filter is inputted pilot detection circuit by outfan after the baseband signal filtering of input.Described demodulator is inputted the second crystal filter by outfan after intermediate-freuqncy signal is carried out secondary amplification, intermediate-freuqncy signal after secondary filtering is inputted demodulator by outfan by described second crystal filter, described pilot detection circuit detects that pilot signal is exported by outfan from the baseband signal of input, and self-test signal is exported by described self-checking circuit by outfan.The radiofrequency signal of input and the frequency requirement of receipts local oscillation signal are 2MHz-500MHz by described mixing, and frequency mixer receives local oscillation signal radio frequency isolation degree and intermediate frequency isolation all at more than 40dB, and the mid frequency of the intermediate-freuqncy signal that frequency mixer finally exports is 14.5MHz.Described intermediate frequency amplifier adopts three-stage amplifier to constitute, and first order amplifying circuit adopts grounded base amplification circuit, the second level and third level amplifying circuit to adopt and sends out altogether or grounded base amplification circuit.
This utility model has the effect that the technical program has monitor in real time and receives the intensity of signal；And the noise ratio of baseband signal can be greatly improved；But also can guarantee that the safe and reliable of communication so that this circuit has significantly high reliability and stability.
Accompanying drawing illustrates:
Fig. 1 is circuit structure block diagram of the present utility model；Fig. 2 is IF amplifier circuit figure；Fig. 3 is the circuit diagram of demodulator；Fig. 4 is the circuit diagram of baseband signal amplifier；Fig. 5 is pilot detection circuit diagram.
Detailed description of the invention:
The technical program receives signal processing circuit detailed description of the invention as it is shown in figure 1, further illustrate a kind of ultrashort wave radio set.
Shown in structured flowchart 1, present treatment circuit is by frequency mixer 1, intermediate frequency buffer circuit 2, first crystal wave filter 3, intermediate frequency amplifier 4, second crystal filter 5, demodulator 6, pilot detection circuit 7, 3rd wave filter 8, baseband signal amplifier 9 and self-checking circuit 10 are constituted, described frequency mixer 1 receives radiofrequency signal by wire and receives local oscillation signal, described frequency mixer is delivered to intermediate frequency buffer circuit 2 by outfan after the radiofrequency signal received being mixed with the local oscillation signal received, first crystal wave filter 3 is inputted by outfan after described intermediate frequency buffer circuit buffering, described first crystal wave filter is inputted intermediate frequency amplifier 4 by outfan after intermediate-freuqncy signal carries out narrow-band filtering, described intermediate frequency amplifier is inputted demodulator 6 by outfan after intermediate-freuqncy signal carries out three grades of amplifications, described demodulator has been bi-directionally connected the second crystal filter, furtherly: described demodulator is inputted the second crystal filter 5 by outfan after intermediate-freuqncy signal is carried out secondary amplification, intermediate-freuqncy signal after secondary filtering is inputted demodulator by outfan by described second crystal filter, demodulator amplifies from secondary and demodulates baseband signal filtered intermediate-freuqncy signal by outfan input baseband signal amplifier 9, the data of demodulator output signal strength instruction simultaneously, described baseband signal amplifier is exported by three-line after baseband signal being amplified respectively, article one, circuit is exported baseband signal by the outfan of baseband signal amplifier, Article 2 circuit is inputted self-checking circuit 10 by the outfan of baseband signal, Article 3 circuit is inputted the 3rd wave filter 8 by the outfan of baseband signal amplifier, described 3rd wave filter 8 is inputted pilot detection circuit 7 by outfan after the baseband signal filtering of input, described pilot detection circuit detects that pilot signal is exported by outfan from the baseband signal of input, self-test signal is exported by described self-checking circuit by outfan.
The radiofrequency signal of input and the frequency requirement of receipts local oscillation signal are 2MHz-500MHz by described frequency mixer 1, and the IF signal frequency of output ranges for DC-500MHz, and conversion loss is 6dB；Within the scope of the ultrashort wave radio set application band of 30MHz-88MHz, frequency mixer receives local oscillation signal radio frequency isolation degree and intermediate frequency isolation all at more than 40dB；The mid frequency of the intermediate-freuqncy signal that frequency mixer finally exports is 14.5MHz.
First crystal wave filter is mainly made up of eight grades of some crystal filters, and its passband central frequency is 14.5MHz, and bandwidth is 22KHz.
Described intermediate frequency amplifier 4 adopts three-stage amplifier to constitute (as shown in Figure 2), and first order amplifying circuit adopts grounded base amplification circuit, the second level and third level amplifying circuit to adopt and sends out-grounded base amplification circuit altogether.
Described demodulator 6 exports to the second crystal filter after demodulation signal being carried out secondary amplification first with the intermediate frequency amplification module in demodulator before demodulation and carries out secondary filtering, filtered modulation signal is fed again into demodulator, then it is carried out limited range enlargement by the limited range enlargement module in demodulator, is finally demodulated baseband signal (as shown in Figure 3) by the quadrature demodulation unit in demodulator.
Second crystal filter is mainly made up of secondary points crystal filter, and its passband central frequency is 14.5MHz, and bandwidth is 26KHz.
3rd wave filter is mainly made up of band filter LB-150, and its mid frequency is 150Hz.
Demodulator when demodulation, demodulation signal is carried out secondary amplification and after the second crystal filter secondary filtering limited range enlargement again, finally go out baseband signal through quadrature demodulation, substantially increase the signal to noise ratio (as shown in Figure 4) of baseband signal.
Demodulator can send out amplification module according to internal intermediate frequency and limited range enlargement module exports signal intensity instruction data, receives the signal intensity of signal in order to monitor in real time.
Pilot detection circuit can detect the pilot signal with enemy and we's recognition function from baseband signal, it is ensured that safe and reliable (as shown in Figure 5) of communication.
Self-checking circuit can export self-test signal, it is possible to these receipts of monitor in real time process the duty of circuit so that this circuit has significantly high reliability and stability.
During work, frequency mixer is used for receiving radiofrequency signal and receives local oscillation signal, and by radiofrequency signal with receive local oscillation signal and carry out the intermediate-freuqncy signal of mixing output difference frequency 14.5MHz to intermediate frequency buffer circuit；Intermediate frequency buffer circuit is to exporting after intermediate frequency signal damping to first crystal wave filter；First crystal wave filter is mainly made up of eight grades of electric crystal wave filter, and its mid frequency is 14.5MHz, and bandwidth is 22KHz, and first crystal wave filter exports to intermediate frequency amplifier after the intermediate-freuqncy signal of 14.5MHz carries out well filtering；The intermediate frequency amplifier being made up of three-stage amplifier exports to demodulator after intermediate-freuqncy signal carries out three grades of amplifications；Intermediate frequency amplification module in demodulator exports the limited range enlargement module inputting to demodulator after carrying out secondary filtering to the second crystal filter and carries out limited range enlargement after intermediate-freuqncy signal is carried out secondary amplification, the demodulation module quadrature demodulation output baseband signal in the demodulated device of last intermediate-freuqncy signal；Meanwhile, demodulator sends out amplification module according to internal intermediate frequency and limited range enlargement module exports signal intensity instruction data, receives the signal intensity of signal in order to monitor in real time.The baseband signal of demodulator output is to baseband signal amplifier, baseband signal after amplification is divided three tunnels outputs by baseband signal amplifier, baseband signal is directly exported by one tunnel, a road output to the self-checking circuit self-inspection in order to circuit, a road output to the 3rd wave filter in order to detect pilot signal；The duty of circuit is judged by self-checking circuit according to the baseband signal of input, and output comprises the self-test signal of circuit working state information；3rd wave filter exports the signal of 150Hz to pilot detection circuit after the baseband signal of input is carried out the bandpass filtering that IF-FRE is 150Hz；Pilot detection circuit detects the pilot signal comprising pilot frequency information from the signal of 150Hz.
Claims (4)
1. a ultrashort wave radio set receives signal processing circuit, it is characterized in that: this circuit is by frequency mixer, intermediate frequency buffer circuit, first crystal wave filter, intermediate frequency amplifier, second crystal filter, demodulator, pilot detection circuit, 3rd wave filter, baseband signal amplifier and self-checking circuit are constituted, described frequency mixer is delivered to intermediate frequency buffer circuit by outfan after the radiofrequency signal received being mixed with the local oscillation signal received, first crystal wave filter is inputted by outfan after described intermediate frequency buffer circuit buffering, described first crystal wave filter is inputted intermediate frequency amplifier by outfan after intermediate-freuqncy signal is carried out narrow-band filtering, described intermediate frequency amplifier is inputted demodulator by outfan after intermediate-freuqncy signal carries out three grades of amplifications, described demodulator has been bi-directionally connected the second crystal filter, intermediate-freuqncy signal secondary is amplified by demodulator and filtered intermediate-freuqncy signal is inputted baseband signal amplifier by outfan, described baseband signal amplifier is exported by three-line after baseband signal being amplified respectively, article one, circuit is exported baseband signal by the outfan of baseband signal amplifier, Article 2 circuit is inputted self-checking circuit by the outfan of baseband signal, Article 3 circuit is inputted the 3rd wave filter by the outfan of baseband signal amplifier, described 3rd wave filter is inputted pilot detection circuit by outfan after the baseband signal filtering of input.
2. a kind of ultrashort wave radio set according to claim 1 receives signal processing circuit, it is characterized in that: described demodulator is inputted the second crystal filter by outfan after intermediate-freuqncy signal is carried out secondary amplification, intermediate-freuqncy signal after secondary filtering is inputted demodulator by outfan by described second crystal filter, described pilot detection circuit detects that pilot signal is exported by outfan from the baseband signal of input, and self-test signal is exported by described self-checking circuit by outfan.
3. a kind of ultrashort wave radio set according to claim 1 receives signal processing circuit, it is characterized in that: the radiofrequency signal of input and the frequency requirement of receipts local oscillation signal are 2MHz-500MHz by described mixing, frequency mixer receives local oscillation signal radio frequency isolation degree and intermediate frequency isolation all at more than 40dB, and the mid frequency of the intermediate-freuqncy signal that frequency mixer finally exports is 14.5MHz.
4. a kind of ultrashort wave radio set according to claim 1 receives signal processing circuit, it is characterized in that: described intermediate frequency amplifier adopts three-stage amplifier to constitute, first order amplifying circuit adopts grounded base amplification circuit, the second level and third level amplifying circuit to adopt and sends out altogether or grounded base amplification circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620031349.6U CN205356314U (en) | 2016-01-14 | 2016-01-14 | Ultrashort wave radio station received signal treatment circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620031349.6U CN205356314U (en) | 2016-01-14 | 2016-01-14 | Ultrashort wave radio station received signal treatment circuit |
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| CN205356314U true CN205356314U (en) | 2016-06-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105680961A (en) * | 2016-01-14 | 2016-06-15 | 中兵通信科技有限公司 | Received signal processing circuit of ultra-short wave radio set |
| CN109152087A (en) * | 2018-07-26 | 2019-01-04 | 同方电子科技有限公司 | A kind of enemy and we's identification function extended method based on radio station |
-
2016
- 2016-01-14 CN CN201620031349.6U patent/CN205356314U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105680961A (en) * | 2016-01-14 | 2016-06-15 | 中兵通信科技有限公司 | Received signal processing circuit of ultra-short wave radio set |
| CN105680961B (en) * | 2016-01-14 | 2018-01-23 | 中兵通信科技股份有限公司 | A kind of ultrashort wave radio set reception signal process circuit |
| CN109152087A (en) * | 2018-07-26 | 2019-01-04 | 同方电子科技有限公司 | A kind of enemy and we's identification function extended method based on radio station |
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Address after: 453000 No. seven, No. 760, weft Road, Xinxiang Industrial Park, Henan, China Patentee after: China Communications Polytron Technologies Inc Address before: 453000 No. seven, No. 760, Xinxiang Industrial Park, Henan, China Patentee before: CNGC Communication Technology Co., Ltd. |