Weather radar differential reflectivity factor parameter calibration method

A weather radar and calibration technology, applied to radio wave measurement systems, instruments, etc., can solve problems such as uncertainty and deviation, achieve good stability, improve data accuracy, and accurately position the effect

Pending Publication Date: 2021-02-12
江苏省气象探测中心 +1
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no metal ball in the country to carry out the dual polarization parameter Z of the business radar CINRAD. DR calibration work, the Z DR The calibration mainly relies on the light rain method, the sun method, etc. The calibration results are affected by many factors, and there are uncertainties and deviations

Method used

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  • Weather radar differential reflectivity factor parameter calibration method
  • Weather radar differential reflectivity factor parameter calibration method
  • Weather radar differential reflectivity factor parameter calibration method

Examples

Experimental program
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Effect test

Embodiment 1

[0060] Set up the radar observation mode according to the above steps, prepare the UAV and other related equipment, calculate the position where the metal ball should hover, and determine the maximum flying height of the UAV, according to the straight-line distance between the flying point and the radar station, and the altitude , Hanging metal ball cable length and other parameters, it is convenient to calculate the metal ball height, scanning elevation angle and so on. Table 4 is the test point. When the distance from the radar station is 7.33km, the azimuth is 316.22 degrees, and the cable length is 68 meters, the relevant data such as the elevation angle and the height of the metal ball are calculated according to formulas (3) and (4).

[0061] Table 4 Parameters such as metal ball flight height and detection elevation angle

[0062]

[0063] Control the radar to perform SPPI or RHI scan to get Z DR The data is shown in Table 5

[0064]

[0065] Through the analysi...

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Abstract

The invention discloses a dual-polarization weather radar ZDR parameter calibration method. The method comprises the steps of 1 determining the length of a suspension line of an unmanned plane and a metal ball according to the linear distance between a selected calibration site and a radar station, and enabling the unmanned plane and the metal ball not to appear in one radar scanning wave beam atthe same time; 2 determining a scanning elevation angle range value according to the altitude of a radar feed source and the linear distance between the test point and the radar station, so that the unmanned aerial vehicle has at least three elevation angle scans within the flight height for distinguishing the unmanned aerial vehicle from the metal ball; 3 setting a radar scanning mode as a customVCP-sect mode, and adopting a sector scanning combination with a target azimuth of + / -5 degrees and an antenna scanning speed of 4deg / s; and 4 suspending the unmanned aerial vehicle at the position of the test point, scanning according to the radar scanning mode set in the step 3, and completing ZDR calibration of the dual-polarization radar. The calibration method has good stability at high altitude, and can effectively improve the precision and reliability of calibration data for radar ZDR test calibration.

Description

technical field [0001] The invention relates to a weather radar Z DR A parameter calibration method belongs to the technical field of radar testing. Background technique [0002] my country is about to build an observation network consisting of 233 new-generation weather radars. For the calibration of weather radars, the China Meteorological Administration has formulated a new-generation weather radar factory (site) acceptance test program (2018 version) and a new-generation weather radar system inspection A series of business documents such as Regulations (Trial Implementation) (2009 Edition) stipulate many SA radar calibration test items. Some domestic experts and scholars have also carried out some research and made some progress. Wang Lixuan et al. (2001) introduced a new generation of weather radar parameter testing, using external instruments to test the automatic calibration results inside the aircraft; Chai Xiumei et al. (2007) analyzed The technical principle of CI...

Claims

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Application Information

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IPC IPC(8): G01S7/40
CPCG01S7/40
Inventor 朱毅周红根孙强姚雷赵宇储晨曦缪明榕肖晨吴嘉伟
Owner 江苏省气象探测中心
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