Weather radar external active calibration device and calibration method

Abstract

The invention discloses a weather radar external active calibration device and a calibration method. The weather radar external active calibration device comprises an antenna feeder module, a host and a display control terminal, wherein the antenna feeder module completes signal receiving and transmitting functions; the host comprises a transmitting and receiving module, a signal processing module, a positioning and communication module and a power supply module for acquiring the geographic information of a calibration device erection place, extracting weather radar signal parameter information and generating target echo signals for simulating the weather radar; the display control terminal completes man-machine interaction operation; the antenna feeder module is connected with the host; and the host is connected with the display control terminal. The calibration device and the calibration method disclosed by the invention can effectively solve problems of calibration errors caused by instability of the calibration device and the calibration source itself for the current traditional internal calibration technology and calibration errors caused by inaccurate receiver front end link loss evaluation.

Description

technical field [0001] The invention relates to weather radar calibration, in particular to a weather radar external active calibration device and a calibration method. Background technique [0002] At present, the calibration of weather radar directly affects the detection accuracy and detection precision of weather radar. It is the basis for quantitative measurement and refined weather detection of a new generation of weather radar network, and is an important means to improve the detection accuracy of weather radar. [0003] In recent years, there have been some related technical researches on the calibration of weather radar in China: Zhang Peiyuan and others from the Chinese Academy of Meteorological Sciences discussed some issues that should be paid attention to in the calibration of digital weather radar; Pan Xinmin and others from Henan Meteorological Bureau gave the CINRAD / SA radar echo intensity calibration and adjustment methods; Chai Xiumei and others from the D...

AI Technical Summary

Problems solved by technology

[0006] (1) Different types of radars have different positioning and uses, and have different requirements and understandings for calibration. Therefore, it is difficult to achieve a unified standard for the design of the internal calibration system, resulting in significant differences in their functions, performance, and indicators.

[0007] (2) As an integral part of the radar system, the internal calibration system, like other systems, is inevitably unstable. If the calibration system is to be stable and reliable, it must be calibrated regularly with external equipment

[0008] (3) The internal calibration system can only couple and inject the calibration signal from the appropriate position of the antenna and feeder. The complete antenna and feeder system loss, the two-way loss of the radome and other parameters are difficult to actually measure after the on-site installation process. , it is even impossible to perform actual calibration during use, and its parameters can only be obtained by segmented estimation and addition, so it is impossible to achieve a complete calibration of the system in the machine

[0009] (4) It is difficult to standardize the working mode of the internal calibration system of different types of radars, and how the calibration results are used to correct the echo data is also different, which affects the accuracy of radar calibration

[0011] (1) Limited by the load capacity of the mounting platform, the volume of the metal ball is limited, resulting in a small RCS

[0012] (2) The metal ball is a passive target, and the echo power is small, so it is difficult to achieve accurate calibration at a long distance

[0014] (4) It is difficult to control the air position of the metal ball mounted on the moving carrier, which is easy to cause beam mismatch, and has high requirements for the environment during calibration

[0016] (6) The whole calibration process requires manual operation, automatic calibration cannot be realized, and there are high requirements for operation level

Images