Calibration method and system for pulse reconstruction and tracking type active calibrator

Abstract

The invention relates to a calibration method for a pulse reconstruction and tracking type active calibrator. The method comprises the steps that an antenna of the pulse reconstruction and tracking type active calibrator is aligned to a standard reflection disk, the antenna is aligned to the reflection disk according to signals which are reflected by the standard reflection disk two times and received by the antenna, and frequency values corresponding to the signals reflected to times are recorded; the distance between the aligned standard reflection disk and an antenna reference point is measured, and a delay value introduced by a feed source and the antenna and a radio frequency channel delay value are acquired based on the obtained distance value and frequency value; data measured by the pulse reconstruction and tracking type active calibrator are corrected through the two obtained delay values, and calibration is completed. The reference point is the position, irradiated by an infrared distance meter, on the antenna when the antenna is aligned to the standard reflection disk. According to alignment, the infrared distance meter and the reference point are arranged in the same horizontal plane, that is, the distances between the infrared distance meter and the two edges of the antenna in the same horizontal plane are equal.

Description

technical field [0001] The invention relates to the technical field of microwave remote sensing, in particular to a calibration method and system for a pulse reconstruction tracking type active scaler. Background technique [0002] The active calibration system is a ground on-orbit calibration device for spaceborne radar. Provide the standard known target echo signal for the spaceborne radar, and the spaceborne radar corrects the delay measurement and other errors of its own system by receiving this standard signal, so as to realize the absolute calibration of the spaceborne radar on orbit. [0003] The pulse reconstruction tracking type active scaler is the scaler disclosed in the application document with the application number "201310436084.9" and the name "A tracking type active scaler based on the retransmission signal reconstruction system". The existing calibration methods for this scaler have the following defects: the system delay calibration methods of the existin...

AI Technical Summary

Problems solved by technology

It is possible to use the primary reflection echo to calibrate the delay of the active scaler. Although it is simple and easy, it does not take a lot of time to debug the secondary reflection signal of the standard reflection disc, but the system based on this principle The delayed calibration method cannot verify the complete alignment mentioned above, so it cannot strongly prove the accuracy of the calibration results

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