Calibration of Channel Mismatch in Super-Resolution Direction Finding

Estimation of DOA is very important in many fields,such as mobile communication,ECM and Radar.With the rapid development of science technology and more and more complex electromagnetic circumstance,the requirement of performance of DF(Direction Finding) estimation is more and more high.DF using spatial spectrum estimation based on eigen-decomposition has good precision and high resolution in ideal case,but when the array model has errors,the performance will degrade significantly or lost its power.A new calibration approach,i.e.equivalence calibration,is proposed for channel mismatch.This method needs only one calibration source.Its calibration effect is good,and the calibration performance is stable.What's more,this method doesn't need much computational work.The computer simulation results demonstrate that the paper's method is effective.