CN2694228Y - Module for digital signal processing and modulating signal digital wobble frequency controlling of radio altimeter - Google Patents
Module for digital signal processing and modulating signal digital wobble frequency controlling of radio altimeter Download PDFInfo
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- CN2694228Y CN2694228Y CN 200420021339 CN200420021339U CN2694228Y CN 2694228 Y CN2694228 Y CN 2694228Y CN 200420021339 CN200420021339 CN 200420021339 CN 200420021339 U CN200420021339 U CN 200420021339U CN 2694228 Y CN2694228 Y CN 2694228Y
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Abstract
The utility model discloses a control module for digital signal processing and modulating signal digital wobble frequency controlling of the radio altimeter. The utility model is characterized in that the control module contains a shaping circuit, a digital signal processing unit, an altitude account and control unit, a digital communication interface and a triangular-wave generator with a digital potentiometer. The input port of the shaping circuit is connected with the beat signal enlarged by a low-frequency amplification module. The output terminal of the shaping circuit is connected with the input port of the digital signal processing unit. The output terminal of the digital signal processing unit is connected with the input port of the altitude account and control unit. The output terminal of the altitude account and control unit is connected with the control end of the digital potentiometer in the triangular-wave generator, and is two-way connected with the digital communication interface. The digital communication interface is two-way connected with the exterior terminal computer. The output terminal of the triangular-wave generator is connected with the receive and dispatch front end of the altimeter. The utility model used for radio altimeter can greatly reduce the error in heighting of the radio altimeter and improve the measure high accuracy of the radio altimeter.
Description
Technical field
The utility model relates to a kind of digital signal processing and modulation signal numeral wobble frequency control module of radio altimeter.
Background technology
In radio altimeter, signal Processing and control module are wherein important ingredients.The echoed signal that radio altimeter is received is a terrain return signal sum in all wave beam area coverages, and echoed signal is very complicated.The common radio height indicator adopts frequency counting circuit that the Beat Signal that the low frequency amplification module amplifies is handled, and its mensuration generally is a count measurement method at zero point.The Beat Signal that the low frequency amplification module amplifies obtains pulse signal through shaping, the repetition frequency of pulse signal equals the Beat Signal frequency, these pulses are through rolling counters forward and convert dc voltage value to, and this dc voltage value is that corresponding radio altimeter records height value.Adopt this method counting circuit a large amount of undesired signals and the noise signal that contain in the Beat Signal also can be counted interior, influence the altimetry precision of radio altimeter.
In addition, radio altimeter is launched FM signal earthward by emitting antenna, and the frequency of FM signal is modulated triangular modulation.Turning point in modulated triangular wave top or bottom, the phase place of Beat Signal also can corresponding appearance turnovers.When coming the survey frequency computed altitude by the counting to shaped pulse signal, phase place turning point place may produce one of many meter or count the situation of a pulse less, altimetry error will occur, and this error is that the FM radio set height indicator is intrinsic.
Summary of the invention
The purpose of this utility model is to provide a kind of digital signal processing and modulation signal numeral wobble frequency control module of radio altimeter, because it has digital signal processing and modulation signal numeral wobble frequency function, can reduce the altimetry error of radio altimeter greatly, improve the altimetry precision of height indicator.
The purpose of this utility model is achieved in that the digital signal processing and the modulation signal numeral wobble frequency control module of radio altimeter, is characterized in:
The triangular-wave generator that comprises a shaping circuit, a digital signal processing unit, a high computational and control module, a digital communication interface and a band digital regulation resistance; The input end of described shaping circuit connects the Beat Signal that the low frequency amplification module amplifies, the output terminal of this shaping circuit is connected with the input end of digital signal processing unit, the output terminal of this digital signal processing unit is connected with the input end of control module with high computational, high computational and the output terminal of control module are connected with digital regulation resistance control end in the triangular-wave generator, and be connected with digital communication interface is two-way, the two-way exterior terminal computing machine that is connected to of digital communication interface, the output terminal of triangular-wave generator is connected to the receiving and transmitting front end of height indicator.
The Beat Signal of low frequency amplification module output enters digital signal processing unit and carries out signal Processing after the shaping circuit shaping, signal entry altitude after treatment calculates with control module and carries out high computational, and high computational result exports to terminal computer through the digital communication interface conversion; The numerical coding of high computational and control module output is controlled the digital regulation resistance in the triangular-wave generator, to realize triangular modulation signal digital wobble frequency function.
The digital signal processing of above-mentioned radio altimeter and modulation signal numeral wobble frequency control module, wherein: described digital signal processing unit comprises noise controller, impulse meter, weighter and signal smoothing device, and the input/output terminal of described noise controller, impulse meter, weighter and signal smoothing device is linked in sequence.
The digital signal processing of above-mentioned radio altimeter and modulation signal numeral wobble frequency control module, wherein: described high computational and control module are made of a microprocessor.
The digital signal processing of above-mentioned radio altimeter and modulation signal numeral wobble frequency control module, wherein: described triangular-wave generator comprises a triangle wave generating circuit, a triangular wave cycle control circuit, a digital regulation resistance and a triangular signal amplifying circuit; The input end of triangle wave generating circuit is connected with the input end of control module with high computational, the output terminal of triangle wave generating circuit is connected with the input end of digital regulation resistance, and the control end of digital regulation resistance is connected with the numerical coding output terminal of control module with high computational; The output terminal of triangular wave cycle control circuit is connected with the control end of triangle wave generating circuit; The output terminal of digital regulation resistance is connected with the input end of triangular signal amplifying circuit, and the output terminal of triangular signal amplifying circuit is connected with the control end of height indicator receiving and transmitting front end.
The digital signal processing of above-mentioned radio altimeter and modulation signal numeral wobble frequency control module, wherein: each mainly is made of described triangle wave generating circuit, triangular wave cycle control circuit and triangular signal amplifying circuit operational amplifier.
Because the utility model has adopted above technical scheme, the effect of its generation is tangible:
1) for improving the radio altimeter altimetry precision, in signal Processing and control module, adopt Digital Signal Processing, Beat Signal is carried out digital processing, filtering interference signals and noise signal, guarantee the altimetry precision of radio altimeter, and make radio altimeter carry out digital communication with the external world easily.
2) for reducing the radio altimeter altimetry error, design has modulation signal numeral wobble frequency function in signal Processing and control module, by modulation signal numeral wobble frequency, promptly allow frequency modulation deviation change by a certain rule by microprocessor control, Beat Signal phase place turning point is also changed according to certain rules, reduced altimetry error, to guarantee the altimetry precision of radio altimeter.
3) the utility model circuit is simple, reliable, and calculation process is convenient, and altimetry error is little, the altimetry precision height.
Description of drawings
Concrete structure of the present utility model is further provided by following embodiment and accompanying drawing thereof.
Fig. 1 is the electrical block diagram of the utility model general structure.
Fig. 2 is the electrical block diagram of the utility model digital signal processing unit.
Fig. 3 is the circuit diagram of triangular-wave generator of the present utility model.
Embodiment
See also Fig. 1, this is the electrical block diagram of the utility model general structure.The digital signal processing of radio altimeter and modulation signal numeral wobble frequency control module comprises that a shaping circuit 1, a digital signal processing unit 2, a high computational and control module 3, a digital communication interface 4 and be with the triangular-wave generator 5 of digital regulation resistance; Wherein: the input end of shaping circuit connects the Beat Signal of the amplification of radio altimeter medium and low frequency amplification module 6 outputs.The output terminal of shaping circuit is connected with the input end of digital signal processing unit, the output terminal of digital signal processing unit is connected with the input end of control module with high computational, high computational and the output terminal of control module are connected with digital regulation resistance control end in the triangular-wave generator, and be connected with digital communication interface is two-way, the two-way exterior terminal computing machine 7 that is connected to of digital communication interface, the output terminal of triangular-wave generator is connected to the receiving and transmitting front end 8 of height indicator.
The Beat Signal of the low frequency amplification module output in the radio altimeter enters digital signal processing unit and carries out signal Processing after the shaping circuit shaping, signal entry altitude after treatment calculates with control module and carries out high computational, and high computational result exports to terminal computer through the digital communication interface conversion; The numerical coding of high computational and control module output is controlled the digital regulation resistance in the triangular-wave generator, to realize triangular modulation signal digital wobble frequency function.
See also Fig. 2, this is the electrical block diagram of the utility model digital signal processing unit 2.Radio altimeter Beat Signal after 2 pairs of shapings of digital signal processing unit carries out signal Processing.The digital signal processing unit 2 of the digital signal processing of the utility model radio altimeter and modulation signal numeral wobble frequency control module comprises noise controller 21, impulse meter 22, weighter 23 and signal smoothing device 24, and wherein: the input/output terminal of noise controller, impulse meter, weighter and signal smoothing device is linked in sequence.
The Beat Signal of shaping circuit output enters digital signal processing unit, at first carries out noise control, and input signal is carried out squelch and adjustment, and pulse signals is counted then, and to count results be weighted, smoothing processing.The repetition frequency of beat pulse signal is all answered uniformity under ideal conditions, and corresponding to current true altitude, but owing to be mixed with a large amount of undesired signals and noise signal in Beat Signal, it is low that the frequency of beat pulse signal also just has height to have.The common radio height indicator does not possess the digital signal processing function, and signal processing module only carries out step-by-step counting, computed altitude to the Beat Signal of input, can't suppress various undesired signals and noise signal, and it is not high to survey high precision as a result, shakes bigger.The utility model adopts noise control method that Beat Signal is carried out squelch and adjustment, to guarantee that Beat Signal is in the optimum signal-noise ratio state, through pulse counting back employing weighting, digital processing method such as level and smooth count results is handled, filtering interference signals is to surveying high influence.By this digital signal processing method, but filtering interference signals and noise signal, the altimetry precision of assurance radio altimeter.
See also Fig. 3, this is the circuit diagram of triangular-wave generator of the present utility model.Modulation signal numeral wobble frequency function is realized by high computational in signal Processing and the control module and control module control triangular-wave generator 5.The triangular-wave generator 5 of the digital signal processing of radio altimeter and modulation signal numeral wobble frequency control module comprises a triangle wave generating circuit 51, a triangular wave cycle control circuit 52, a digital regulation resistance 53 and a triangular signal amplifying circuit 54; The input end of triangle wave generating circuit 51 is connected with the input end of control module with high computational, the output terminal of triangle wave generating circuit is connected with the input end of digital regulation resistance, and the control end of digital regulation resistance is connected with the numerical coding output terminal of control module with high computational; The output terminal of triangular wave cycle control circuit is connected with the control end of triangle wave generating circuit; The output terminal of digital regulation resistance is connected with the input end of triangular signal amplifying circuit, and the output terminal of triangular signal amplifying circuit is connected with the control end of height indicator receiving and transmitting front end.Wherein: described triangle wave generating circuit mainly is made of operational amplifier N1, and the triangular wave cycle control circuit mainly is made of operational amplifier N2, and the triangular signal amplifying circuit mainly is made of operational amplifier N3.The recurrent pulse that triangular wave cycle control circuit output one control triangular wave takes place feeds back to the input end of triangle wave generating circuit, after the potentiometer R2 fine setting that the input end of triangle wave generating circuit operational amplifier N1 connects, be input to triangle wave generating circuit, recurrent pulse is input to high computational and control module as the triangular wave synchronizing signal simultaneously, the output terminal output triangular signal of N1, behind digital regulation resistance, deliver to triangular signal amplifying circuit N3 and amplify, output to the control end of the receiving and transmitting front end of height indicator.C1 is a charge and discharge capacitance among the figure.High computational and control module send numerical coding control figure potentiometer, and digital regulation resistance resistance value size clocklike changes, and the amplitude of the modulated triangular wave of N3 output is also changed by a certain rule, realize the wobble frequency function.The utility model radio altimeter has reduced altimetry error owing to adopt digital control wobble frequency function, improves and surveys high resolving power, has guaranteed altimetry precision.
Shaping circuit of the present utility model 1 is made of comparator circuit; High computational and control module 3 are made of a microprocessor chip, and for example model is 89C51; Digital communication interface 4 is made of integrated circuit (IC) chip, and for example model is: MAX490.
Principle of work of the present utility model:
The repetition frequency of beat pulse signal is all answered uniformity under ideal conditions, and corresponding to current true altitude, but owing to be mixed with a large amount of undesired signals and noise signal in Beat Signal, it is low that the frequency of beat pulse signal also just has height to have.Microprocessor is counted the pulse number of beat pulse signal of input within a certain period of time, and adopt digital processing methods such as weighting, level and smooth, intermediate value processing that enumeration data is handled, the beat pulse signal of the too high or too low frequency of filtering calculates current true altitude to surveying high influence.By this digital signal processing method, but filtering interference signals and noise signal, the altimetry precision of assurance radio altimeter.
Modulation signal numeral wobble frequency function is realized by the control of the microprocessor in signal Processing and control module triangular-wave generator.Modulation signal during the work of triangular-wave generator output radio altimeter frequency modulation, microprocessor sends the digital regulation resistance in the numerical coding control triangular-wave generator.Digital regulation resistance resistance value size clocklike changes, the amplitude of radio altimeter modulated triangular wave is also changed by a certain rule, realize the wobble frequency function, and signal is carried out demodulation process by microprocessor, reduce altimetry error, improve and survey high resolving power, guarantee the altimetry precision of radio altimeter.
Claims (5)
1, the digital signal processing of radio altimeter and modulation signal numeral wobble frequency control module is characterized in that:
The triangular-wave generator that comprises a shaping circuit, a digital signal processing unit, a high computational and control module, a digital communication interface and a band digital regulation resistance; The input end of described shaping circuit connects the Beat Signal that the low frequency amplification module amplifies, the output terminal of this shaping circuit is connected with the input end of digital signal processing unit, the output terminal of this digital signal processing unit is connected with the input end of control module with high computational, high computational and the output terminal of control module are connected with digital regulation resistance control end in the triangular-wave generator, and be connected with digital communication interface is two-way, the two-way exterior terminal computing machine that is connected to of digital communication interface, the output terminal of triangular-wave generator is connected to the receiving and transmitting front end of height indicator.
The Beat Signal of low frequency amplification module output enters digital signal processing unit and carries out signal Processing after the shaping circuit shaping, signal entry altitude after treatment calculates with control module and carries out high computational, and high computational result exports to terminal computer through the digital communication interface conversion; The triangular wave synchronizing signal of high computational and control module output control triangular-wave generator is also exported numerical coding the digital regulation resistance in the triangular-wave generator is controlled, to realize triangular modulation signal digital wobble frequency function.
2, the digital signal processing of radio altimeter according to claim 1 and modulation signal numeral wobble frequency control module, it is characterized in that: described digital signal processing unit comprises noise controller, impulse meter, weighter and signal smoothing device, and the input/output terminal of described noise controller, impulse meter, weighter and signal smoothing device is linked in sequence.
3, the digital signal processing of radio altimeter according to claim 1 and modulation signal numeral wobble frequency control module, it is characterized in that: described high computational and control module are made of a microprocessor.
4, the digital signal processing of radio altimeter according to claim 1 and modulation signal numeral wobble frequency control module, it is characterized in that: described triangular-wave generator comprises a triangle wave generating circuit, a triangular wave cycle control circuit, a digital regulation resistance and a triangular signal amplifying circuit; The input end of triangle wave generating circuit is connected with the input end of control module with high computational, the output terminal of triangle wave generating circuit is connected with the input end of digital regulation resistance, and the control end of digital regulation resistance is connected with the numerical coding output terminal of control module with high computational; The output terminal of triangular wave cycle control circuit is connected with the control end of triangle wave generating circuit; The output terminal of digital regulation resistance is connected with the input end of triangular signal amplifying circuit, and the output terminal of triangular signal amplifying circuit is connected with the control end of height indicator receiving and transmitting front end.
5, the digital signal processing of radio altimeter according to claim 1 and modulation signal numeral wobble frequency control module, it is characterized in that: each mainly is made of described triangle wave generating circuit, triangular wave cycle control circuit and triangular signal amplifying circuit operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420021339 CN2694228Y (en) | 2004-03-29 | 2004-03-29 | Module for digital signal processing and modulating signal digital wobble frequency controlling of radio altimeter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200420021339 CN2694228Y (en) | 2004-03-29 | 2004-03-29 | Module for digital signal processing and modulating signal digital wobble frequency controlling of radio altimeter |
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| CN2694228Y true CN2694228Y (en) | 2005-04-20 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103376090A (en) * | 2012-04-20 | 2013-10-30 | 泰雷兹公司 | Radio altimeter system capable of operating in a dual radio altimeter system |
| CN105807265A (en) * | 2016-05-13 | 2016-07-27 | 中国电子科技集团公司第五十八研究所 | Miniaturized high-performance altimeter signal processing and control SIP module |
| CN106092040A (en) * | 2016-05-30 | 2016-11-09 | 中国电子科技集团公司第五十研究所 | Eliminate the system and method for FMCW altimeter precision drift |
| CN111025278A (en) * | 2019-12-31 | 2020-04-17 | 北京中科飞鸿科技股份有限公司 | Radio altimeter |
-
2004
- 2004-03-29 CN CN 200420021339 patent/CN2694228Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103376090A (en) * | 2012-04-20 | 2013-10-30 | 泰雷兹公司 | Radio altimeter system capable of operating in a dual radio altimeter system |
| CN105807265A (en) * | 2016-05-13 | 2016-07-27 | 中国电子科技集团公司第五十八研究所 | Miniaturized high-performance altimeter signal processing and control SIP module |
| CN106092040A (en) * | 2016-05-30 | 2016-11-09 | 中国电子科技集团公司第五十研究所 | Eliminate the system and method for FMCW altimeter precision drift |
| CN106092040B (en) * | 2016-05-30 | 2018-08-24 | 中国电子科技集团公司第五十研究所 | The system and method for eliminating FMCW altimeter precision drifts |
| CN111025278A (en) * | 2019-12-31 | 2020-04-17 | 北京中科飞鸿科技股份有限公司 | Radio altimeter |
| CN111025278B (en) * | 2019-12-31 | 2023-09-01 | 北京中科飞鸿科技股份有限公司 | Radio altimeter |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050420 Termination date: 20120329 |