InSAR signal simulator is an important equipment in the hardware-in-loop simulation of distributed SAR

the nonideal channel characteristic of which will affect the evaluation accuracy.The correction of channel amplitude and phase characteristic based on the real-time filtering is studied.A novel correlation and windowing method is used to extract the channel characteristic in the loop data.A method based on the complex Remez algorithm and the genetic algorithm is used to design the complex FIR coefficients.Finally

a FPGA technique is used to implement the complex FIR filter.The channel mismatch peak-peak value of the simulator is corrected from 1 dB/ 10 degree to 0.1 dB/1 degree.The hardware-in-loop simulation validates the proposed real-time correction approach.