基于有源编码转发器的SAR辐射定标精度研究

在基于移相器的有源编码转发器设计方案基础上,重点对由移相器精度导致的方位信号编码误差进行了深入研究.提出了方位信号最大频率偏移误差的成对回波计算方法,确定了SAR辐射定标精度和移相器精度二者之间的关系.在不同成对回波信杂比条件下,进行了SAR有源编码转发信号的辐射定标成像处理和辐射定标精度测量的仿真实验,得到了有源编码转发器中移相器精度与SAR辐射定标精度间的定量关系.

Study of SAR Radiometric Calibration Based on Active Coded Transponder

This paper investigated active coded transponder(ACT) with purpose for SAR radiometric calibration.A design project based phase shifter about ACT was proposed.The coded error of azimuth signal,which caused by phase shifter accuracy,was studied in detail.Maximum frequency shift error about azimuth signal was calculated.The relationship between phase shifter accuracy and radiometric calibration accuracy is derived.Under the condition of different echo-pair signal and clutter ratio,image formation about active coded transponder and measurement of radiometric calibration were carried out by simulation.The curve line between phase shifter accuracy and radiometric calibration accuracy was obtained.