Weather radar calibration method

A weather radar and calibration technology, which is applied in the direction of climate sustainability, radio wave reflection/re-radiation, and utilization of re-radiation, etc., can solve the problems of the system's inability to detect clutter suppression capabilities online and upload fewer parameters, and achieve improvement The effect of transmitting power online detection technology, improving reliability and improving speed measurement accuracy

Pending Publication Date: 2020-03-24
CHENGDU JINJIANG ELECTRONICS SYST ENG
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Problems solved by technology

However, phase noise, noise figure, intensity calibration and other detection items need to be calibrated online through manual in

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  • Weather radar calibration method

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0042] Such as Figure 1 ~ Figure 2 , taking the CINRAD-SC / CD weather radar as an example, using this method for calibration, the echo strength calibration of this type of weather radar mainly involves the transmission channel, reception channel, antenna feeder, test channel, software and adaptation data. The transmit power Pt is sampled by the microwave power probe coupled with the output of the klystron through the test cable. The frequency synthesizer provides the continuous wave test signal (CW signal) and the transmitter radio frequency pulse excitation signal (RF Driver signal) respectively. The CW signal is injected into the receiver through the test channel to detect the performance of the receiving channel, and the injection point of the receiver calibration test si...

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Abstract

The invention relates to a weather radar calibration method. RFDs with small, medium and large fixed powers at 1.5 Km and CW signals with fixed powers circularly stepping along with the distance in arange from 5Km to 200Km are used; the signals are injected from the front end of a receiver, and echo intensity measurement values are corrected in real time by using an average value of difference values of measurement values and target values of the four types of calibration signals so as to ensure high, medium and low echo intensity measurement precision in a radar quantitative observation range; kD signals (three power signals) output by a klystron are injected from the front end of a receiver through delay simulation echo signals once every 8 hours, the average value of the difference between the measured value and the target value of the KD signals is calculated, echo intensity calibration inspection is conducted, automatic alarm is conducted when the difference exceeds the limit, and therefore the precision of the echo intensity measured value is guaranteed. The method has the beneficial effects that automatic online correction can be achieved, the accuracy is good, and the precision is high.

Description

technical field [0001] The invention relates to the technical field of antenna array processing, in particular to a weather radar calibration method. Background technique [0002] Since the CINRAD-SC / CD radar produced by our company has been put into operation, the overall operation has been stable, and it has played an important role in weather forecast services, disaster prevention and mitigation, etc. However, with the increase of operating years, radar failures gradually increased, equipment hardware aging, reliability and performance parameters decreased, which affected the quality of radar observation data. The radar parameter testing platform is lacking, the automatic online monitoring points are insufficient, the remote diagnosis function and automatic online calibration function are not perfect, and the benefits of radar construction have not been fully utilized. [0003] For the radar before improvement, only the characteristic curve calibration and the measuremen...

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Application Information

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IPC IPC(8): G01S7/40G01S7/41G01S13/95
CPCG01S7/40G01S7/41G01S13/95Y02A90/10
Inventor 孔石华杨旻许海川
Owner CHENGDU JINJIANG ELECTRONICS SYST ENG
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