CN103592640A - Automatic high-precision calibration method of meteorological radar send-receive channel gains - Google Patents
Automatic high-precision calibration method of meteorological radar send-receive channel gains Download PDFInfo
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- CN103592640A CN103592640A CN201310587489.2A CN201310587489A CN103592640A CN 103592640 A CN103592640 A CN 103592640A CN 201310587489 A CN201310587489 A CN 201310587489A CN 103592640 A CN103592640 A CN 103592640A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000012545 processing Methods 0.000 claims abstract description 11
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 238000012360 testing method Methods 0.000 abstract description 16
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 230000003111 delayed effect Effects 0.000 abstract 1
- 238000012795 verification Methods 0.000 abstract 1
- 230000008569 process Effects 0.000 description 7
- 230000008878 coupling Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 5
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- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
- G01S7/4008—Means for monitoring or calibrating of parts of a radar system of transmitters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/95—Radar or analogous systems specially adapted for specific applications for meteorological use
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4004—Means for monitoring or calibrating of parts of a radar system
- G01S7/4021—Means for monitoring or calibrating of parts of a radar system of receivers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention relates to an automatic high-precision calibration method of meteorological radar send-receive channel gains. A signal loop is built between a transmitter and a receiver through a directional coupler and a time delay unit to achieve the united testing of the send-receive channel gains, and a high-precision AGC circuit and a signal processing circuit are used to control the gains automatically so that the precision and the stability of gain calibration of the receiver can be ensured. For a meteorological radar system, it is very necessary that the send-receive channel gains are detected in an on-line mode and are calibrated. A signal output by the radar transmitter is coupled into a path of testing signal directly, the testing signal is delayed by the time delay unit and then fed back to the radar receiver, testing on the send-receive channel gains is achieved when a radar does not operate, and a signal processing system judges whether a channel operates normally or not according to the measurement value of the gains, and achieves accurate calibration. Through experimental verification, the on-line monitoring and calibration method of the channel has realizability and practical significances.
Description
Technical field
The present invention relates to the Gain Automatic high accuracy calibration method of a kind of weather radar transceiver channel, belong to radar system detection calibration method and technology.
Background technology
Because be that the attenuation in space judges sexual intercourse intensity according to echoed signal in weather radar, so must the gain of transmitter and receiver (being transceiver channel) be tested and be calibrated in the use procedure of weather radar, to guarantee that weather radar can work.Meanwhile, the high-precision requirement based on weather radar to transceiver channel gain, gain calibration must be regular, and can carry out online.In normal calibration, transmitter and receiver is timesharing, separately carries out, transmitter uses reference power meter to carry out power test, the mode that receiver adopts standard signal source to inject is carried out gain test, then the transmitter power of test and receiver gain are carried out to COMPREHENSIVE CALCULATING, obtain gain deviation the calibration of transceiver channel.Whole process cannot realize on-line automatic calibration.In conventional transceiver channel calibration, why receive and dispatch separately, mainly because transmitter emissive power is too large, the leakage in system, crosstalk etc. also very large, at transmitter duration of work receiver all the time in state of saturation, cannot work, the work such as calculating also just cannot gain.And will have output power standard signal source very accurately, radar system self in receiver calibration process, be to be difficult to produce such standard signal, must rely on outside to set up instrument and realize, so whole sending and receiving calibration process is complicated, precision is not high.
The transceiver channel gain calibration methods thereof of the present invention's design is used the directional coupler of high coupling that transmitter output signal is coupled out, after chronotron, test sending receiver back to by directional coupler, thereby realize joint test, the calibration of transmitter and receiver.The advantage of this design is not need accurately to test out the emissive power of transmitter and the gain absolute value of receiver, only the amplitude of recharging signal accurately need to be tested, and just can reach the requirement of transceiver channel calibration.The problem that cannot work as for transmitter duration of work receiver, is solved by chronotron, and transmitting coupled signal is fixed the time delay of time in chronotron, avoids launch time and high echo power time, then sends into receiver and test.Signal processing system is measured after the gain of transceiver channel, realizes the high-precision calibration of transmitting-receiving gain by high-precision A GC circuit.The transceiver channel gain calibration methods thereof equipment amount of the present invention's design is few, and calibration accuracy is high, and can realize on-line automatic test.
Summary of the invention
The object of the invention is to for providing a kind of weather radar transceiver channel Gain Automatic high accuracy calibration method.
Realizing technical solution of the present invention is: by the radar transmitter direct-coupling Chu Yi road signal that transmits, send into chronotron, after a period of time constant time lag, feed back to radar receiver, final in the amplitude of signal processing system measuring-signal the gain of calculating transceiver channel, signal processing system is controlled the high-precision A GC circuit in receiver according to the measured value of gain, thereby realizes the on-line automatic calibration of high precision of transceiver channel gain.
The present invention compared with prior art, its remarkable advantage is: (1) precision is high, do not need the emissive power of accurate measurand transmitter and the gain of receiver, only need accurately to measure the amplitude of recharging signal (low-power level signal), just can accurately reflect the change in gain of transceiver channel; (2) equipment amount is few, easily realizes.Do not need high-precision power test equipment and standard signal source, only need in former radar system, increase directional coupler, chronotron and agc circuit, also without special monitoring modular, circuit is relatively simple, and cost is low, easy to use; (3) can realize on-line automatic test.In calibration process, radar is in normal operating conditions, and do not affect system works, without planning alignment time separately, can in start or normal operation, carry out by automatic insertion, simple to operate, flexible, convenient.
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Accompanying drawing explanation
Accompanying drawing 1 is realized block diagram for the Gain Automatic high accuracy calibration method of a kind of weather radar transceiver channel.
Embodiment
Shown in implementation process and accompanying drawing 1, specifically describe as following process:
In order to realize, to the gain of transceiver channel is online, detect and calibration function, in the signal generator module of radar, produced specially the single-frequency test signal of several microseconds of pulsewidth, process and three up-conversions are moved signal frequency radio frequency and are delivered to transmitter from intermediate frequency, then will transmit by the directional coupler road that is coupled, through chronotron, do sufficiently long set time time delay, give again radar receiver and carry out down-converted and obtain intermediate-freuqncy signal, finally intermediate-freuqncy signal is given to signal processing system and carry out accurate amplitude measurement and calculate transceiver channel gain.According to measuring and calculation result, the high-precision A GC circuit in receiver is carried out to automatic gain control, thereby realize the Gain Automatic calibration of transceiver channel.
The degree of coupling design of directional coupler will be considered two factors: a signal power that is coupling obtains will be enough to guarantee that signal processing system test is within the scope of optimum measurement, the 2nd, guarantee that chronotron is damaged and in best effort dynamic range.Because the isolation of radar system four end circulators is lower, during launching, that transmission channel or the microwave signal power receiving in sensible are all very large, and chronotron is miniwatt Sensitive Apparatus, be easy to be burnt by high-power, so the degree of coupling of the directional coupler at chronotron two ends is all very high.But the too high reduction that can cause again receiver output signal power of the degree of coupling, thereby the measuring accuracy of impact transmitting-receiving gain.So the degree of coupling of directional coupler is wanted careful selection, so just can play the effect of protection chronotron, can obtain good measuring accuracy again.
The main problem of considering delay time of chronotron design, should avoid emission period, avoids again the closely larger time period of echo power.Meanwhile, the change in gain of chronotron self can directly affect measuring accuracy, introduces error.So chronotron self wants designing gain to proofread and correct clear circuit, this circuit does not participate in the work of whole calibration system, just plays the manual correction function to chronotron self gain, regularly manually zero clearing, the gain constant of assurance chronotron.
Gain control and the control accuracy of agc circuit are determined by numerical-control attenuator, for example, so will select high-precision numerical-control attenuator (6 is the maximum attenuation 31.5dB of numerical-control attenuator, stepping 0.5dB).Meanwhile, guarantee to measure, the real-time of calibration, require the reaction time of numerical-control attenuator and signal processing system can not be long.Signal processing system draws the change in gain of transceiver channel, then to AGC, provides gain control signal according to this result of variations, and receiver gain is carried out to real-time adjustment.
Claims (1)
1. the Gain Automatic high accuracy calibration method of weather radar transceiver channel, it is characterized in that: by the radar transmitter direct-coupling Chu Yi road signal that transmits, send into chronotron, after a period of time constant time lag, feed back to radar receiver, final in the amplitude of signal processing system measuring-signal the gain of calculating transceiver channel, signal processing system is controlled the high-precision A GC circuit in receiver according to the measured value of gain, thereby realizes the High Precision Automatic calibration of transceiver channel gain.
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| CN201310587489.2A CN103592640A (en) | 2013-11-20 | 2013-11-20 | Automatic high-precision calibration method of meteorological radar send-receive channel gains |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104215941A (en) * | 2014-08-13 | 2014-12-17 | 芜湖航飞科技股份有限公司 | Pulse Doppler weather radar receiver |
| CN104569980A (en) * | 2015-01-27 | 2015-04-29 | 中国空间技术研究院 | Ground terahertz radar system for detecting cloud |
| CN105403866A (en) * | 2015-11-25 | 2016-03-16 | 中国电子科技集团公司第三十八研究所 | Real-time large dynamic synthetic aperture radar receiver |
| CN106772287A (en) * | 2016-12-07 | 2017-05-31 | 北京控制与电子技术研究所 | A kind of Radar Automatic Test System of generic Extensible |
| CN107340519A (en) * | 2017-07-02 | 2017-11-10 | 中国航空工业集团公司雷华电子技术研究所 | A kind of weather radar rainfall detecting analytic system and method |
| CN107462871A (en) * | 2016-06-03 | 2017-12-12 | 松下知识产权经营株式会社 | Radar installations and transmitted power control method |
| CN107561514A (en) * | 2017-07-27 | 2018-01-09 | 中国船舶重工集团公司第七二四研究所 | A kind of frequency sweeps scaling method in three-dimensional radar rcs measurement multichannel |
| CN111487625A (en) * | 2020-04-29 | 2020-08-04 | 信阳师范学院 | System and method for full-automatic rainfall measurement by using microwave radar |
| CN112068094A (en) * | 2020-09-09 | 2020-12-11 | 中国航空工业集团公司雷华电子技术研究所 | Airborne millimeter wave cloud finding radar calibration method and system |
| CN112534302A (en) * | 2019-02-15 | 2021-03-19 | 华为技术有限公司 | Radar and gain control method |
| CN113917429A (en) * | 2021-09-30 | 2022-01-11 | 中国船舶重工集团公司第七二四研究所 | Frequency-scanning multi-beam radar elevation precision improving method based on gain fine control |
| CN114172595A (en) * | 2021-11-11 | 2022-03-11 | 中国电子科技集团公司第二十九研究所 | Power testing method and device for shared receiving and transmitting channel |
| CN119179053A (en) * | 2024-11-25 | 2024-12-24 | 浙江宜通华盛科技有限公司 | Phased array weather radar and amplitude-phase calibration system and method thereof |
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| US5160933A (en) * | 1990-08-28 | 1992-11-03 | Honeywell Inc. | Radar altimeter with self-calibration feature |
| 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 |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104215941A (en) * | 2014-08-13 | 2014-12-17 | 芜湖航飞科技股份有限公司 | Pulse Doppler weather radar receiver |
| CN104569980A (en) * | 2015-01-27 | 2015-04-29 | 中国空间技术研究院 | Ground terahertz radar system for detecting cloud |
| CN105403866A (en) * | 2015-11-25 | 2016-03-16 | 中国电子科技集团公司第三十八研究所 | Real-time large dynamic synthetic aperture radar receiver |
| CN107462871A (en) * | 2016-06-03 | 2017-12-12 | 松下知识产权经营株式会社 | Radar installations and transmitted power control method |
| CN106772287A (en) * | 2016-12-07 | 2017-05-31 | 北京控制与电子技术研究所 | A kind of Radar Automatic Test System of generic Extensible |
| CN107340519B (en) * | 2017-07-02 | 2021-02-19 | 中国航空工业集团公司雷华电子技术研究所 | Weather radar rainfall detection analysis system and method |
| CN107340519A (en) * | 2017-07-02 | 2017-11-10 | 中国航空工业集团公司雷华电子技术研究所 | A kind of weather radar rainfall detecting analytic system and method |
| CN107561514A (en) * | 2017-07-27 | 2018-01-09 | 中国船舶重工集团公司第七二四研究所 | A kind of frequency sweeps scaling method in three-dimensional radar rcs measurement multichannel |
| CN112534302B (en) * | 2019-02-15 | 2022-02-11 | 华为技术有限公司 | A kind of radar and gain control method |
| CN112534302A (en) * | 2019-02-15 | 2021-03-19 | 华为技术有限公司 | Radar and gain control method |
| CN111487625A (en) * | 2020-04-29 | 2020-08-04 | 信阳师范学院 | System and method for full-automatic rainfall measurement by using microwave radar |
| CN112068094A (en) * | 2020-09-09 | 2020-12-11 | 中国航空工业集团公司雷华电子技术研究所 | Airborne millimeter wave cloud finding radar calibration method and system |
| CN113917429A (en) * | 2021-09-30 | 2022-01-11 | 中国船舶重工集团公司第七二四研究所 | Frequency-scanning multi-beam radar elevation precision improving method based on gain fine control |
| CN113917429B (en) * | 2021-09-30 | 2024-08-16 | 中国船舶集团有限公司第七二四研究所 | Frequency-scanning multi-beam radar elevation angle precision improving method based on gain refinement control |
| CN114172595A (en) * | 2021-11-11 | 2022-03-11 | 中国电子科技集团公司第二十九研究所 | Power testing method and device for shared receiving and transmitting channel |
| CN119179053A (en) * | 2024-11-25 | 2024-12-24 | 浙江宜通华盛科技有限公司 | Phased array weather radar and amplitude-phase calibration system and method thereof |
| CN119179053B (en) * | 2024-11-25 | 2025-03-07 | 浙江华盛雷达股份有限公司 | Phased array weather radar and amplitude-phase calibration system and method thereof |
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Application publication date: 20140219 |