摘要
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.
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 t dB/10 degree to 0.1 dB/1 degree. The hardware-in-loop simulation validates the proposed real-time correc- tion approach.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2013年第9期1710-1715,共6页
Acta Electronica Sinica
基金
国家自然科学基金(No.61002031)
武器装备预研基金(No.9140A21020910KG01)
关键词
干涉SAR模拟器
通道幅相特性
实时校正
半实物仿真
InSAR signal simulator
channel amplitude and phase characteristic
real-time correclion
hardware-in-loop sim-ulation
