干涉SAR模拟器通道幅相特性实时校正方法

干涉SAR模拟器是构建单航过InSAR系统地面半实物仿真系统的重要地检设备,模拟器通道幅相非理想特性会影响对干涉性能的准确评估.研究了基于实时滤波校正模拟器通道幅相特性的方法:采用相关加窗处理从闭环数据中提取通道幅相特性,提出了复Remez算法和遗传算法相结合的方法设计复FIR滤波器系数,采用FPGA实现高数据率数据的实时滤波.通过实时校正将模拟器通道间幅相一致性误差峰峰值从1 dB/10度量级提高至0.1 dB/1度水平,半实物试验验证了本文实时校正方法的有效性.

Channel Characteristic Real-Time Correction of InSAR Signal Simulator

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.