CN104539269A - Signal processing circuit for instrument landing ground equipment - Google Patents
Signal processing circuit for instrument landing ground equipment Download PDFInfo
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- CN104539269A CN104539269A CN201410794129.4A CN201410794129A CN104539269A CN 104539269 A CN104539269 A CN 104539269A CN 201410794129 A CN201410794129 A CN 201410794129A CN 104539269 A CN104539269 A CN 104539269A
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Abstract
The invention relates to a signal processing circuit for instrument landing ground equipment. The circuit comprises a stepping attenuator, a band-pass filter, a first radio-frequency amplifier, a second radio-frequency amplifier, a third radio-frequency amplifier, an automatic gain control circuit, a PIN diode attenuator, a first radio detector, a second radio detector, a temperature compensating circuit, a first operational amplifier and a second operational amplifier. By the adoption of the circuit, the defects of existing circuit design that a closed-loop circuit and a temperature compensating circuit are not arranged, temperature influence is high, input dynamic range is narrow, output variation is large, and reliability is poor are effectively overcome, technical indexes are remarkably improved, input dynamic range reaches -5dBm - -35dBm, input dynamic range is wide, temperature compensation property is good, and stability is high.
Description
Technical field
The present invention relates to instrument landing ground installation, particularly relate to a kind of instrument landing ground installation signal processing circuit.
Background technology
Signal processing circuit is that domestic novel metric wave ILE (ILS) is equipped with.Instrument landing system (ILS) is a kind of pacer approach control that International Civil Aviation Organization determines, it can provide guidance information that is vertical and level for the aircraft of approach.At present, the signal processing circuit of known existing equipment exists and does not have closed loop circuit and temperature-compensation circuit, and temperature influence is very large, and input dynamic range is narrow, and exporting change is larger, and the defect such as poor reliability.
Summary of the invention
The present invention, in order to overcome technical problem and the defect of the existence of above-mentioned prior art, provides a kind of instrument landing ground installation signal processing circuit especially.New design, makes technical indicator, integrated level, reliability and operability all increase substantially.
The present invention for achieving the above object, the technical scheme taked is: a kind of instrument landing ground installation signal processing circuit, is characterized in that: comprise step attenuator, band pass filter, the first radio frequency amplifier, the second radio frequency amplifier, the 3rd radio frequency amplifier, automatic gain control circuit, PIN diode attenuator, first detector, second detector, temperature-compensation circuit, the first operational amplifier and the second operational amplifier; Wherein step attenuator is connected with band pass filter, band pass filter is connected with the first radio frequency amplifier, first radio frequency amplifier is connected with the second radio frequency amplifier, second radio frequency amplifier is connected with PIN diode attenuator and first detector respectively, automatic gain control circuit is connected with PIN diode attenuator, PIN diode attenuator is connected with the 3rd radio frequency amplifier, and the 3rd radio frequency amplifier is connected with second detector, second detector and the second operational amplifier; First detector is connected with temperature-compensation circuit, and temperature-compensation circuit is connected with the first operational amplifier.
The defects such as feature of the present invention and beneficial effect are: effectively overcome in available circuit design and exist and do not have closed loop circuit and temperature-compensation circuit, and temperature influence is very large, and input dynamic range is narrow, the larger and poor reliability of exporting change.The features such as adopt this circuit design, technical indicator is improved significantly, and input dynamic range is wide reaches-5dBm ~-35dBm, has input dynamic range wide, and temperature compensation characteristic is good, stability is good.Can be loaded in 6u standard subrack, in printed board and on metal shielding box, have adjustable end points, easy to use, reliable, can product be successfully applied to.Gained radio frequency level signal after processing of circuit is DC level; Gained baseband signal is audio signal, brings convenience to the process of subsequent cell signal.As long as front end band pass filters of the present invention, output low-pass filter circuit are changed a little, be namely applicable to different radiofrequency signals and different audio modulation signals, there is the very large universal space.
Accompanying drawing explanation
Fig. 1 is signal processing circuit block diagram of the present invention;
Fig. 2 is radio-frequency amplifier circuit schematic diagram in Fig. 1;
Fig. 3 is temperature-compensation circuit schematic diagram in Fig. 1;
Fig. 4 is PIN diode attenuator circuit schematic diagram in Fig. 1.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
With reference to Fig. 1, signal processing circuit of the present invention is made up of, below with explanation of coming eight identical parts: the front end of radio frequency input installs step attenuator (5dB, 10dB, 15dB) as required.A band pass filter below.Input signal, by public input channel, first through two radio frequency amplifiers, then divides two-way, and a road is automatic gain (AGC) control circuit, and export to baseband signal, another road is radio frequency level signal.What modulating baseband signal exported is stable 90Hz, 150Hz modulating baseband signal.Radio frequency level signal is the direct voltage being entered as ratio with radio frequency.Signal processing circuit is the input equipment of instrument landing system, it can receive from antenna feeder case, standby host monitors and near field monitors the different range signals transmitted, and working frequency range covers 108MHz ~ 112MHz(course respectively) and 328MHz ~ 336MHz(downslide).Input signal through the process of this circuit, the baseband signal that exportable system needs and radio frequency level signal.
Outward appearance of the present invention is the approximate rectangle structure with metal shielding box, and this circuit design is inner at complete machine, and structure adopts board plug type structure, and maintainability is good.In order to eliminate interference to greatest extent, reduced volume, whole module adopts the mode of two-sided layout, and centre interlayer separates.Whole circuit is made up of eight identical tunnels, and each road is placed in shielding box independently in cavity, and do not interfere with each other, reliability is high, stable and reliable for performance.Radio frequency part device layout is as far as possible compact, shortens cabling, overstriking live width.Consider the earth point of each integrated package, eliminate the power supply associated stray of 50Hz as far as possible, carry out filtering and the decoupling of power supply simultaneously, this is all beneficial to raising spurious reduction, reduction noise and erase amplifier self-excitation etc.
This signal processing circuit adopts three radio frequency amplifiers, and in radio-frequency amplifier circuit, what amplifier tube adopted is the product of Mini company, and in circuit, the model of amplifier tube N3 is ERA-3SM+, and its temperature range is wide, and gain is large, and stable performance, can meet design requirement.
Physical circuit is described below: with reference to Fig. 2, first radio frequency amplifier, second radio frequency amplifier and the 3rd radio-frequency amplifier circuit adopt ERA-3SM+ amplifier tube N3 respectively, one end of electric capacity C22 is input, the other end connects 1 pin of amplifier tube N3, 2 pin of amplifier tube N3 and 4 pin ground connection respectively, 3 pin connect one end of electric capacity C42 and one end of inductance L 7, the other end of electric capacity C42 is output, one end of other end contact resistance R16 of inductance L 7 and one end of resistance R17, one end of inductance L 8 is connect after the other end of resistance R16 is connected with the other end of resistance R17, one end of electric capacity C25 and one end of electric capacity C24, the other end of electric capacity C25 and the other end of electric capacity C24 ground connection respectively, meet power supply VCC after one end of the other end of inductance L 8 and one end of electric capacity C26 and electric capacity C27 is connected to hold, the other end of electric capacity C26 and the other end of electric capacity C27 ground connection respectively.
The radio frequency level signal section of this signal processing circuit applies temperature-compensation circuit.Radiofrequency signal feeds back to operational amplifier port through diode detection.This operational amplifier is a high resistant buffer to detector diode.Another diode is for compensating and follow the trail of the temperature drift of detector diode DC point, and differential is connected to operational amplifier and realizes following the trail of.Alternating component is walked by resistance-capacitance circuit filter.The flip-flop retained is amplified by amplifier.Add the thermistor of negative temperature coefficient in circuit, during further guarantee high/low temperature, output level is stable, and output level is realized by regulator potentiometer.Resistance-capacitance circuit is decayed the alternating component left over, and finally obtains radio frequency level signal.The product of Avago company selected by diode, and in circuit, the model of diode V4 is HSMS2825(surface-mount type radio frequency Schottky barrier diode).
Physical circuit is described below: with reference to Fig. 3, the temperature-compensation circuit of this signal processing circuit adopts HSMS2825 diode V4, amplifier N4A and an amplifier N4B, 4 pin of diode V4 are connected rear with one end of resistance R19 be input, one end of the 3 pin contact resistance R20 of diode V4, the other end of resistance R19 and the other end of resistance R20 ground connection respectively; 2 pin of diode V4 connect one end of electric capacity C28, one end of resistance R21 and one end of resistance R23, the other end ground connection of electric capacity C28, one end of one end of other end contact resistance R27 of resistance R21, one end of resistance R22 and electric capacity C30, one termination-15V the power supply of resistance R27, the other end of resistance R22 connects 1 pin of diode V4, one end of electric capacity C29 and one end of resistance R25,1 pin of diode V4 connects-15V power supply simultaneously, the other end of electric capacity C29 and the other end of electric capacity C30 ground connection respectively; One end of other end contact resistance R24 of resistance R23 and 3 pin of amplifier N4A, the other end ground connection of resistance R24; The other end of 2 pin contact resistance R25 of amplifier N4A and one end of resistance R26,2 pin of amplifier N4A connect+15V power supply simultaneously; The other end of resistance R26 connects 1 pin of amplifier N4A and one end of resistance R28, and the other end of resistance R28 connects 5 pin of amplifier N4B and one end of electric capacity C31, the other end ground connection of electric capacity C31; One end of 6 pin contact resistance R30 of amplifier N4B and one end of resistance R31, one end of the other end contact resistance R29 of resistance R30 and one end of thermistor resistance R32, the other end of resistance R29 is connected rear ground connection with the other end of thermistor resistance R32; As output after the other end of resistance R31 is connected with 7 pin of amplifier N4B.
The closed loop circuit part of this signal processing circuit adopts AGC control voltage to control the electric current of PIN diode attenuator, and then controls amplification quantity, and when ensureing input signal amplitude change, baseband signal amplitude is constant.Radiofrequency signal, from amplifier to PIN diode attenuator, is then passed through another PIN diode attenuator to load resistance, then is amplified by amplifier.The size of AGC control voltage is generated automatically by the amplitude of input radio frequency signal.PIN diode selects Agilent company HSMP series of diode, and in circuit, the model of PIN diode V6 and PIN diode V7 is HSMP3814, meets design requirement.
Physical circuit is described below: with reference to Fig. 4, the PIN diode attenuator circuit of this signal processing circuit adopts two HSMP3814 PIN diode, be respectively PIN diode V6 and PIN diode V7, one end of electric capacity C36 is input, the other end connects 2 pin of PIN diode V7, one end of electric capacity C37 and one end of resistance R42, the other end of resistance R42 connects one end of electric capacity C39, one end of electric capacity C38 and one end of resistance R41, + 15V power supply is connect after the other end of resistance R41 is connected with one end of electric capacity C40, the other end of electric capacity C40, the other end of electric capacity C39 and the other end of electric capacity C38 ground connection respectively, 3 pin of PIN diode V7 connect one end of electric capacity C44 and one end of resistance R43, and the other end of resistance R43 connects one end of electric capacity C45 and 1 pin of PIN diode V6, the other end of electric capacity C44 and the other end of electric capacity C45 ground connection respectively, 2 pin of PIN diode V6 connect the other end of electric capacity C37 and one end of inductance L 9, and the other end of inductance L 9 connects one end of electric capacity C41 and one end of resistance R44, the other end ground connection of electric capacity C41, and the other end of resistance R44 connects AGC control voltage end, 3 pin of PIN diode V6 connect one end of electric capacity C42 and one end of resistance R45, and the other end ground connection of resistance R45, the other end of electric capacity C42 is as output.
Other parts in this signal processing circuit, as step attenuator, band pass filter and automatic gain control circuit etc. are known in this field and conventional circuit, do not repeat them here.According to the above description, the present invention can be realized.
Claims (4)
1. an instrument landing ground installation signal processing circuit, is characterized in that: comprise step attenuator, band pass filter, the first radio frequency amplifier, the second radio frequency amplifier, the 3rd radio frequency amplifier, automatic gain control circuit, PIN diode attenuator, first detector, second detector, temperature-compensation circuit, the first operational amplifier and the second operational amplifier; Wherein step attenuator is connected with band pass filter, band pass filter is connected with the first radio frequency amplifier, first radio frequency amplifier is connected with the second radio frequency amplifier, second radio frequency amplifier is connected with PIN diode attenuator and first detector respectively, automatic gain control circuit is connected with PIN diode attenuator, PIN diode attenuator is connected with the 3rd radio frequency amplifier, and the 3rd radio frequency amplifier is connected with second detector, second detector and the second operational amplifier; First detector is connected with temperature-compensation circuit, and temperature-compensation circuit is connected with the first operational amplifier.
2. a kind of instrument landing ground installation signal processing circuit according to claim 1, it is characterized in that: the first described radio frequency amplifier, second radio frequency amplifier and the 3rd radio-frequency amplifier circuit adopt ERA-3SM+ amplifier tube N3 respectively, one end of electric capacity C22 is input, the other end connects 1 pin of amplifier tube N3, 2 pin of amplifier tube N3 and 4 pin ground connection respectively, 3 pin connect one end of electric capacity C42 and one end of inductance L 7, the other end of electric capacity C42 is output, one end of other end contact resistance R16 of inductance L 7 and one end of resistance R17, one end of inductance L 8 is connect after the other end of resistance R16 is connected with the other end of resistance R17, one end of electric capacity C25 and one end of electric capacity C24, the other end of electric capacity C25 and the other end of electric capacity C24 ground connection respectively, meet power supply VCC after one end of the other end of inductance L 8 and one end of electric capacity C26 and electric capacity C27 is connected to hold, the other end of electric capacity C26 and the other end of electric capacity C27 ground connection respectively.
3. a kind of instrument landing ground installation signal processing circuit according to claim 1, it is characterized in that: described temperature-compensation circuit adopts HSMS2825 diode V4, amplifier N4A and an amplifier N4B, 4 pin of diode V4 are connected rear with one end of resistance R19 be input, one end of the 3 pin contact resistance R20 of diode V4, the other end of resistance R19 and the other end of resistance R20 ground connection respectively; 2 pin of diode V4 connect one end of electric capacity C28, one end of resistance R21 and one end of resistance R23, the other end ground connection of electric capacity C28, one end of one end of other end contact resistance R27 of resistance R21, one end of resistance R22 and electric capacity C30, one termination-15V the power supply of resistance R27, the other end of resistance R22 connects 1 pin of diode V4, one end of electric capacity C29 and one end of resistance R25,1 pin of diode V4 connects-15V power supply simultaneously, the other end of electric capacity C29 and the other end of electric capacity C30 ground connection respectively; One end of other end contact resistance R24 of resistance R23 and 3 pin of amplifier N4A, the other end ground connection of resistance R24; The other end of 2 pin contact resistance R25 of amplifier N4A and one end of resistance R26,2 pin of amplifier N4A connect+15V power supply simultaneously; The other end of resistance R26 connects 1 pin of amplifier N4A and one end of resistance R28, and the other end of resistance R28 connects 5 pin of amplifier N4B and one end of electric capacity C31, the other end ground connection of electric capacity C31; One end of 6 pin contact resistance R30 of amplifier N4B and one end of resistance R31, one end of the other end contact resistance R29 of resistance R30 and one end of thermistor resistance R32, the other end of resistance R29 is connected rear ground connection with the other end of thermistor resistance R32; As output after the other end of resistance R31 is connected with 7 pin of amplifier N4B.
4. a kind of instrument landing ground installation signal processing circuit according to claim 1, it is characterized in that: described PIN diode attenuator circuit adopts two HSMP3814 PIN diode, be respectively PIN diode V6 and PIN diode V7, one end of electric capacity C36 is input, the other end connects 2 pin of PIN diode V7, one end of electric capacity C37 and one end of resistance R42, the other end of resistance R42 connects one end of electric capacity C39, one end of electric capacity C38 and one end of resistance R41, + 15V power supply is connect after the other end of resistance R41 is connected with one end of electric capacity C40, the other end of electric capacity C40, the other end of electric capacity C39 and the other end of electric capacity C38 ground connection respectively, 3 pin of PIN diode V7 connect one end of electric capacity C44 and one end of resistance R43, and the other end of resistance R43 connects one end of electric capacity C45 and 1 pin of PIN diode V6, the other end of electric capacity C44 and the other end of electric capacity C45 ground connection respectively, 2 pin of PIN diode V6 connect the other end of electric capacity C37 and one end of inductance L 9, and the other end of inductance L 9 connects one end of electric capacity C41 and one end of resistance R44, the other end ground connection of electric capacity C41, and the other end of resistance R44 connects AGC control voltage end, 3 pin of PIN diode V6 connect one end of electric capacity C42 and one end of resistance R45, and the other end ground connection of resistance R45, the other end of electric capacity C42 is as output.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410794129.4A CN104539269B (en) | 2014-12-21 | 2014-12-21 | A kind of instrument landing ground installation signal processing circuit |
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| CN201410794129.4A CN104539269B (en) | 2014-12-21 | 2014-12-21 | A kind of instrument landing ground installation signal processing circuit |
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| CN104539269B CN104539269B (en) | 2017-06-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106067772A (en) * | 2016-06-12 | 2016-11-02 | 广州杰赛科技股份有限公司 | The gain compensating method of a kind of radio-frequency module and device |
| CN106100599A (en) * | 2016-06-12 | 2016-11-09 | 广州杰赛科技股份有限公司 | The gain compensating method of a kind of radio-frequency module and device |
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| CN101394151A (en) * | 2008-10-14 | 2009-03-25 | 福建先创电子有限公司 | Automatic gain compensation and linear control method and device for power amplifier |
| CN101841901A (en) * | 2009-12-30 | 2010-09-22 | 中国科学院电子学研究所 | Closed-loop automatic gain automatic control device and method for radio-frequency channel |
| CN204376854U (en) * | 2014-12-21 | 2015-06-03 | 天津七六四通信导航技术有限公司 | Instrument landing ground installation signal processing circuit |
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2014
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US4438348A (en) * | 1978-10-06 | 1984-03-20 | Harris Corporation | Temperature compensated avalanche photodiode optical receiver circuit |
| CN2094164U (en) * | 1991-06-20 | 1992-01-22 | 北京电视技术研究所 | Agc frequency channel amplifier |
| CN1758779A (en) * | 2004-10-10 | 2006-04-12 | 中兴通讯股份有限公司 | Automatic gain control method and device for array antenna base station of time-division duplex system |
| CN101394151A (en) * | 2008-10-14 | 2009-03-25 | 福建先创电子有限公司 | Automatic gain compensation and linear control method and device for power amplifier |
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| CN204376854U (en) * | 2014-12-21 | 2015-06-03 | 天津七六四通信导航技术有限公司 | Instrument landing ground installation signal processing circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106067772A (en) * | 2016-06-12 | 2016-11-02 | 广州杰赛科技股份有限公司 | The gain compensating method of a kind of radio-frequency module and device |
| CN106100599A (en) * | 2016-06-12 | 2016-11-09 | 广州杰赛科技股份有限公司 | The gain compensating method of a kind of radio-frequency module and device |
| CN106067772B (en) * | 2016-06-12 | 2018-05-18 | 广州杰赛科技股份有限公司 | The gain compensating method and device of a kind of radio-frequency module |
| CN106100599B (en) * | 2016-06-12 | 2018-11-23 | 广州杰赛科技股份有限公司 | A kind of gain compensating method and device of radio-frequency module |
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| CN104539269B (en) | 2017-06-09 |
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