Array Amplitude And Phase Errors Correction Algorithm And Its Implementation

Receiving and transmitting digital beam forming (DBF) technology is used inWideband Digital Array Radar (WDAR). But the amplitude and phase errors for the thecharacteristic of analog devices and circuits will cause the frequency-dependentamplitude and phase differences of receiver channels and transmitter channels inWDAR. The differences among the frequency responses of the channels will affect thesuperior performance of the WDAR seriously.In the dissertation, the impact of the mismatch on WDAR’s performance isanalyzed. Firstly, the model of signals received by WDAR and some common arrayerrors are analyzed. Then two algorithms in time-domain and frequency-domain isintroduced in the dissertation. The later is investigated, and a modified algorithm infrequency-domain which is based on least squares fitting method is presented andachieves good performances. The simulation experiment shows the performance of thealgorithms in time-domain and frequency-domain and the impact to the performance ofthe DBF.With the theory basis of amplitude and phase errors correction maturated, also thedevelopment of the IC, the project implementation of array signal processing techniquesis now possible. Based on some antenna in satellite, construction of the hardwareplatform and the amplitude and phase correction algorithm are presented. Especially thegeneral structure, communication mode and algorithm processing on the signalprocessing board are introduced in detail. At last, the performance of the algorithm isverified by the simulation experiment.