CN2746659Y - Microwave phase-lock emission module for radio altimeter - Google Patents
Microwave phase-lock emission module for radio altimeter Download PDFInfo
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- CN2746659Y CN2746659Y CN 200420109781 CN200420109781U CN2746659Y CN 2746659 Y CN2746659 Y CN 2746659Y CN 200420109781 CN200420109781 CN 200420109781 CN 200420109781 U CN200420109781 U CN 200420109781U CN 2746659 Y CN2746659 Y CN 2746659Y
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- radio altimeter
- controlled oscillator
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Abstract
The utility model discloses a microwave phase-lock emission module for the radio altimeter. The utility model contains a voltage-controlled oscillator, a directional coupler, a frequency demultiplier, a bias ring and a phase-locked loop control unit. The output terminal of the voltage-controlled oscillator is connected with the input port of the directional coupler. The output terminal of the directional coupler is connected with input port of the frequency demultiplier. The output terminal of the frequency demultiplier is connected with one input port of the phase-locked loop control unit. The output terminal of the bias ring is connected with the other input port of the phase-locked loop control unit. The output terminal of the phase-locked loop control unit is connected with the control end of the voltage-controlled oscillator. The module has locking phase control function, avoids the dropping down of the altimeter measure height performance caused by the performance offset of the voltage-controlled oscillator in the microwave emission module when the radio altimeter is under high-low temperature environment. The utility model improves the frequency stability of the signal emitted by the radio altimeter and the linear frequency modulation performance, and guarantees the altimeter accuracy and stability of the radio altimeter.
Description
Technical field
The utility model relates to and utilizes microwave to carry out highly the instrument of measuring, and more specifically refers to a kind of radio altimeter microlock transmitter module that is used for.
Background technology
In radio altimeter, the microwave transmitter module is wherein important part.The service behaviour quality of microwave transmitter module directly has influence on the survey high-performance of radio altimeter.
Continuous Wave with frequency modulation system radio altimeter, tested height and the radio altimeter frequency modulation deviation that transmits has functional relation, and the altimetry precision that skew will influence radio altimeter takes place frequency modulation deviation.Traditional microwave transmitter module comprises voltage-controlled oscillator, directional coupler, frequency divider, biasing ring.During radio altimeter work, because the high and low temperature environment influence, pressuring controlling oscillator frequency stability and linear frequency modulation performance in the transmitter module can change, and produce frequency shift (FS), thereby influence the radio altimeter altimetry precision.Therefore, be necessary traditional microwave transmitter module is improved,, improve the altimetry precision of altimeter so that its frequency modulation deviation is stabilized in certain scope.
Summary of the invention
The purpose of this utility model is the above-mentioned shortcoming that exists at traditional microwave transmitter module, and a kind of frequency that transmits, good linearity, radio altimeter microlock transmitter module that frequency modulation deviation is stable are provided.
To achieve these goals, the utility model adopts following technical scheme,
A kind of radio altimeter microlock transmitter module,
Comprise voltage controlled oscillator, directional coupler, frequency divider, biasing ring, phase-locked loop control unit,
Described voltage controlled oscillator output is connected to the input of directional coupler, the output of directional coupler is connected to the input of frequency divider, the output of frequency divider is connected to an input of phase-locked loop control unit, the output of biasing ring is connected to another input of phase-locked loop control unit, and the output of phase-locked loop control unit is connected to the control end of voltage controlled oscillator.
Described phase-locked loop control unit further comprises digital phase discriminator, loop filter, the input of digital phase discriminator is connected with the output of frequency divider with the biasing ring, the output of digital phase discriminator is connected with the input of loop filter, and the output of loop filter is connected to an input of voltage controlled oscillator.
Described digital phase discriminator is a programmable gate array chip.
Described loop filter adopts three rank RC passive filters.
Described biasing ring mainly adopts Direct Digital Frequency Synthesizers.
Because the utility model has adopted above technical scheme, comprises voltage controlled oscillator, directional coupler, frequency divider, biasing ring, phase-locked loop control unit in the microlock transmitter module.Therefore, compare, have following advantage with traditional transmitter module:
Given the phase-locked controlled function of transmitter module, thereby avoided radio altimeter under high and low temperature environment, because of the altimeter that voltage controlled oscillator service behaviour skew in the microwave transmitter module causes is surveyed high-performance decline, improve frequency stability and linear frequency modulation performance that radio altimeter transmits, thereby guarantee radio altimeter survey high accuracy and stability.
Description of drawings
Fig. 1 is a transmitter module frame principle figure of the present utility model.
Fig. 2 is transmitter module square frame of the present utility model and phase-locked loop control unit embodiment schematic diagram.
Embodiment
See also Fig. 1,
The utility model radio altimeter microlock transmitter module comprises voltage controlled oscillator, directional coupler, frequency divider, phase-locked loop control unit, a biasing ring.Voltage controlled oscillator 1 output connects the input of directional coupler, the output of directional coupler connects the input of frequency divider, the output of frequency divider connects an input of phase-locked loop control unit, the output of biasing ring connects another input of phase-locked loop control unit, and the output of phase-locked loop control unit connects the control end of voltage controlled oscillator.
In the microwave transmitter module, the input receiving frequency-sweeping modulation signal of voltage-controlled oscillator, the output signal of directional coupler coupling sub-fraction voltage controlled oscillator, by the frequency divider frequency division to IF-FRE, this intermediate-freuqncy signal is as an input signal of phase-locked loop control unit, and another input signal is produced by the biasing ring.The phase-locked loop control unit to frequency division and intermediate-freuqncy signal carry out the frequency discrimination phase demodulation with the offset signal of biasing ring output, and output is proportional to the voltage of the integral error control signal of their frequency plot differences, this voltage makes error trend towards 0 the tuning voltage controlled oscillator output frequency of direction, make voltage controlled oscillator by phase-locked, frequency stabilization.Because radio altimeter works in the frequency modulation pattern, microwave transmitter module voltage controlled oscillator output signal frequency needs to carry out frequency sweep work by modulation signal, therefore in modulated process, biasing ring signal frequency also changes synchronously by this rule, makes voltage controlled oscillator output signal also can keep locking in frequency sweep work.
See also Fig. 2, Continuous Wave with frequency modulation system radio altimeter, tested height and the radio altimeter frequency modulation deviation that transmits has functional relation, and the altimetry precision that skew will influence radio altimeter takes place frequency modulation deviation.During radio altimeter work, because the high and low temperature environment influence, the pressuring controlling oscillator frequency stability and the linear frequency modulation performance of microwave transmitter module can change, and producing frequency shift (FS) influences the radio altimeter altimetry precision.For addressing this problem, design has phase-locked controlled function in radio altimeter microwave transmitter module, make voltage controlled oscillator output signal in frequency sweep work, keep locking, improve frequency accuracy, avoid descending raising radio altimeter survey high accuracy and stability because the altimeter that the drift of voltage controlled oscillator service behaviour causes is surveyed high-performance under the radio altimeter high and low temperature environment.
Phase-locked loop control unit of the present utility model is made up of digital phase discriminator and loop filter.Wherein, digital phase discriminator mainly is made of field programmable gate array chip, and loop filter is made of the three rank RC passive filters that R1, R2, R3, C1, C2, C3, C4 form.
To IF-FRE, this intermediate-freuqncy signal is as an input signal of phase-locked loop control unit digital phase discriminator through frequency division for the voltage controlled oscillator output signal of directional coupler coupling, and another input signal of digital phase discriminator is produced by the biasing ring.Digital phase discriminator is made of field programmable gate array chip, and two input signals are carried out the frequency discrimination phase demodulation, and output is proportional to the error pulse signal of their frequency plot differences.The error pulse signal carries out loop filtering through the three rank RC passive filters that R1, R2, R3, C1, C2, C3, C4 form, form integral error voltage, this voltage makes error trend towards 0 the tuning voltage controlled oscillator output frequency of direction, make voltage controlled oscillator by phase-locked, under the effect of integration, keep frequency stabilization.Loop filter is the critical component of phase-locked loop control unit, and loop essential characteristic such as it and loop bandwidth, catching range has close getting in touch.Adopt three rank RC passive filters as loop filter, the element initial value obtains by software emulation.Because radio altimeter works in frequency sweep mode, considers the relation of loop bandwidth and sweep velocity, loop bandwidth also needs further to adjust.If the too narrow loop-locking overlong time that may make of loop bandwidth influences sweep velocity, can influence indexs such as spuious inhibition and bandwidth is excessive.
The biasing ring of microlock transmitter module of the present utility model mainly is made of Direct Digital Frequency Synthesizers, and model adopts AD9852.Direct Digital Frequency Synthesizers is so that its frequency resolution height, frequency inverted speed are fast, the frequency conversion phase place is continuous, phase noise is low and totally digitilizedly be used widely at present.There are 48 phase accumulators AD9852 inside, contains high performance D/A converter and high-speed comparator, the clock frequency height, and the frequency resolution height, frequency hopping speed is fast.Because AD9852 has the linear frequency modulation function, can realize frequency sweep work easily.In the radio altimeter work, microwave transmitter module voltage controlled oscillator is pressed the work of modulation signal frequency sweep, and in the modulated process, the biasing ring also changes synchronously by this rule, makes voltage controlled oscillator output signal also can keep locking in frequency sweep work.
The voltage controlled oscillator that the utility model is used for the microlock transmitter module of radio altimeter adopts integrated arrowband voltage controlled oscillator, directional coupler adopts microstrip antenna designs, frequency divider adopts high speed frequency division chip, because of all being adopts ripe integrated circuit, so do not give unnecessary details.
Radio altimeter of the present utility model microlock transmitter module, the altimeter of having avoided radio altimeter to cause owing to voltage controlled oscillator service behaviour drift in the microwave transmitter module under high and low temperature environment is surveyed high-performance and is descended, improve frequency stability and linear frequency modulation performance that radio altimeter transmits, guarantee radio altimeter survey high accuracy and stability.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the utility model, and be not to be used as qualification of the present utility model, as long as in connotation scope of the present utility model, all will drop in the scope of the utility model claims variation, the modification of the above embodiment.
Claims (5)
1, a kind of radio altimeter microlock transmitter module,
It is characterized in that:
This transmitter module comprises voltage controlled oscillator, directional coupler, frequency divider, biasing ring, phase-locked loop control unit,
Described voltage controlled oscillator output is connected to the input of directional coupler, the output of directional coupler is connected to the input of frequency divider, the output of frequency divider is connected to an input of phase-locked loop control unit, the output of biasing ring is connected to another input of phase-locked loop control unit, and the output of phase-locked loop control unit is connected to the control end of voltage controlled oscillator.
2, radio altimeter according to claim 1 microlock transmitter module,
It is characterized in that:
Described phase-locked loop control unit further comprises digital phase discriminator, loop filter, the input of digital phase discriminator is connected with the output of frequency divider with the biasing ring, the output of digital phase discriminator is connected with the input of loop filter, and the output of loop filter is connected to an input of voltage controlled oscillator.
3, radio altimeter according to claim 2 microlock transmitter module,
It is characterized in that:
Described digital phase discriminator is a programmable gate array chip.
4, radio altimeter according to claim 2 microlock transmitter module is characterized in that:
Described loop filter adopts three rank RC passive filters.
5, radio altimeter according to claim 1 microlock transmitter module,
It is characterized in that:
Described biasing ring mainly adopts Direct Digital Frequency Synthesizers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420109781 CN2746659Y (en) | 2004-11-12 | 2004-11-12 | Microwave phase-lock emission module for radio altimeter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420109781 CN2746659Y (en) | 2004-11-12 | 2004-11-12 | Microwave phase-lock emission module for radio altimeter |
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| CN2746659Y true CN2746659Y (en) | 2005-12-14 |
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| CN 200420109781 Expired - Fee Related CN2746659Y (en) | 2004-11-12 | 2004-11-12 | Microwave phase-lock emission module for radio altimeter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360071A (en) * | 2011-06-23 | 2012-02-22 | 北京豪恩科技有限责任公司 | Method and apparatus for verification of linear frequency modulation continuous wave of radio digital altimeter |
| 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 |
| CN107894718A (en) * | 2017-11-08 | 2018-04-10 | 江西洪都航空工业集团有限责任公司 | A kind of radio signal processing system and method based on phaselocked loop |
| CN113437969A (en) * | 2021-05-25 | 2021-09-24 | 国仪量子(合肥)技术有限公司 | Phase-locked loop frequency synthesizer and control method thereof |
-
2004
- 2004-11-12 CN CN 200420109781 patent/CN2746659Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360071A (en) * | 2011-06-23 | 2012-02-22 | 北京豪恩科技有限责任公司 | Method and apparatus for verification of linear frequency modulation continuous wave of radio digital altimeter |
| 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 |
| CN107894718A (en) * | 2017-11-08 | 2018-04-10 | 江西洪都航空工业集团有限责任公司 | A kind of radio signal processing system and method based on phaselocked loop |
| CN113437969A (en) * | 2021-05-25 | 2021-09-24 | 国仪量子(合肥)技术有限公司 | Phase-locked loop frequency synthesizer and control method thereof |
| WO2022247215A1 (en) * | 2021-05-25 | 2022-12-01 | 国仪量子(合肥)技术有限公司 | Phase-locked loop frequency synthesizer and control method therefor |
| CN113437969B (en) * | 2021-05-25 | 2023-04-07 | 国仪量子(合肥)技术有限公司 | Phase-locked loop frequency synthesizer and control method thereof |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20051214 Termination date: 20111112 |