干涉SAR目标回波信号模拟器的设计与实现

Design and Implementation of Target Echo Signal Simulator for Interferometric SAR

完成了星载干涉SAR目标回波信号模拟器的设计与实现,该模拟器能够与一发双收干涉SAR构成雷达半实物仿真回路,实时记录主星雷达发射信号,离线调制场景信息后,依据雷达工作时序实时播放主辅星场景回波。采用高数字中频收发技术获得优良的谐杂波和载波抑制性能,利用在线闭环校正技术对模拟器通道间幅相一致性误差进行实时校准。测试结果表明模拟器各项指标均达到设计要求,能够满足干涉SAR半实物仿真试验的工程应用要求。

The Target Echo Signal Simulator（TESS） for interferometric SAR was designed and implemented.The TESS can make a hardware-in-loop simulation loop with radar working in interferometric bistatic mode.It recorded the transmitting signal of the master satellite in real-time,supplemented the scene modulation information off-line,and played back the radar echo of master and slave satellite according to the radar PRF.The high digital IF transmitting and receiving technique was used to achieve better harmonic,clutter and carrier suppression performance.The on-line loop correction technique was adopted to correct the amplitude and phase mismatch of TESS in real-time.The measured results show that the indexes of TESS satisfy the design requirements,and the TESS meets the needs of practical engineering of the hardware-in-loop simulation for interferometric SAR.