CAJ | 학술논문

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1dB/10度量级提高至0．1dB/1度水平，半实物试验验证了本文实时校正方法的有效性．
간섭SAR모의기시구건단항과InSAR계통지면반실물방진계통적중요지검설비，모의기통도폭상비이상특성회영향대간섭성능적준학평고．연구료기우실시려파교정모의기통도폭상특성적방법：채용상관가창처리종폐배수거중제취통도폭상특성，제출료복Remez산법화유전산법상결합적방법설계복FIR려파기계수，채용FPGA실현고수거솔수거적실시려파．통과실시교정장모의기통도간폭상일치성오차봉봉치종1dB/10도량급제고지0．1dB/1도수평，반실물시험험증료본문실시교정방법적유효성．
InSAR signal simulator is an important equipment in the hardware-in-loop simulation of distributed SAR ,the non-ideal 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 coeffi-cients .Finally ,a FPGA technique is used to implement the complex FIR filter .The channel mismatch peak-peak value of the simula-tor is corrected from 1 dB/10 degree to 0 .1 dB/1 degree .The hardware-in-loop simulation validates the proposed real-time correc-tion approach .