Multichannel radar amplitude and phase automatic correcting method and device

Abstract

The invention discloses multichannel radar amplitude and phase automatic correcting method and device. The method comprises the following steps of: before a radar system works, respectively feeding the same radio frequency test signal into various receiving channels of a multichannel radar system by a feed source to obtain the phase characteristic and the amplitude characteristic of various receiving channels; calculating a phase difference and an amplitude specific value between other channel signals and a reference signal by using one of channel signals as a reference signal; and then enabling the radar system to work, carrying out automatic correction on target echoes of all the channels by utilizing the obtained phase difference and the amplitude specific value so as to ensure the consistency of all the channels on amplitudes and phases. When a transmission frequency point is changed or a radar working environment is changed, the amplitude and phase characteristics of the receiving channels are unavoidably changed; and the invention can accurately and conveniently measure and correct the change of the amplitude and phase characteristic and ensure the consistency of all the channels, thereby expanding the working frequency range and the environmental adaptability of radar and improving the maintainability of the radar.

Description

technical field [0001] The invention relates to the technical field of radar, in particular to a method and device for automatically correcting amplitude and phase of multi-channel radar. Background technique [0002] The monopulse tracking radar requires that the three receiving channels of the receiving system, such as the sum road, the azimuth difference road and the elevation angle difference road, have strict phase and amplitude consistency in the radar working frequency band. In actual engineering, due to the differences between components and transmission lines, The phase and amplitude of these three channels must be compensated and adjusted. [0003] At present, the commonly used calibration method in China is to use the signal source set up in the far field of the antenna to test one by one, and adjust the feeder length of the high frequency and intermediate frequency terminals according to the test results. This method is easy to implement and low in cost, but it n...

AI Technical Summary

Problems solved by technology

When the frequency band changes, re-testing is required to correct the length of the feeder, so it is not suitable for broadband systems, and has the disadvantages of poor environmental applicability, difficulty in real-time calibration, and inconvenient use and maintenance.

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