Two-channel Conformance Test Analysis of S-band Dual-polarization Radar

The consistency of the dual-channel radar plays a crucial role in the performance of the dual-polarization radar. In theory, the performance of the two channels is required to be completely consistent, but it cannot be completely consistent due to the influence of hardware errors, temperature and noise in practical applications. Therefore, it is necessary to test the consistency of horizontal and vertical channels of radar regularly in business applications. Aiming at this problem, the receiving system of Jinan S-band dual polarization radar is tested by off-line manual testing and online automatic testing. The offline measurement uses two signal sources inside and outside the machine to test separately, it is found that the output power difference between the two channels is too large. After the connection lines of the two channels and the two-channel power divider are exchanged, the output power of the two channels is basically the same. The test results of noise coefficient and echo intensity of the two channels are good and meet the requirement of consistency. CW signal source and TS signal source are used for online automatic test. The amplitude and phase standard deviation of the CW signal and the TS signal meet the requirements of the index. However, TS signal is used to calibrate the received full link, which increases the loss of azimuth rotation joint, so its amplitude and phase standard difference are higher than CW signal. Therefore, it is necessary to test and correct the deviation caused by the rotation joint regularly after running for a long time for the dual polarization radar. The two measurement methods in this paper can effectively detect the dual-channel consistency of radar.