Ka频段合成孔径雷达高度计机载数据处理

Ka-band SAR altimeter airborne data processing

雷达高度计是一种重要的海洋微波遥感器,利用雷达高度计观测海面动力高度是进行全球尺度海洋监测的有效手段。近年来,雷达高度计逐渐从实孔径模式向合成孔径模式发展,从Ku频段向Ka频段发展,观测的精度和分辨率得到了较大提升。首先研究了Ka频段合成孔径雷达高度计的全链路数据处理方法,包括回波预处理、改进的回波模型、回波重跟踪,然后基于国内首次Ka频段海面机载试验数据进行参数反演,并采用平均海面高模型数据进行验证。数据处理结果证明了数据处理方法的正确性。

Radar altimeter is an important ocean microwave remote sensor.Using radar altimeter to observe the dynamic height of the sea surface is an effective means for global-scale ocean monitoring.In recent years,the radar altimeter has gradually developed from the real aperture mode to the synthetic aperture mode and from the Ku-band to the Ka-band.The accuracy and resolution of the observation have been significantly improved.This paper firstly studies the complete flow scheme of the data processing method of Ka-band synthetic aperture radar altimeter,including echo preprocessing,improved echo model,and echo re-tracking.Then,based on the first domestic Ka-band sea surface airborne experiment data,parameter retrieval is carried out and verified using the mean sea surface height model data.The data processing result proves the correctness of the data processing method in this paper.