延时多普勒雷达高度计（Delay Doppler Radar Altimeter,DDA）是采用孔径合成技术进行高度测量的雷达高度计。与传统雷达高度计相比,DDA沿航迹方向分辨率提高了10倍,发射峰值功率降低了10dB,测高精度提高到2cm。采用DDA技术可以使仪器测量精度更高、空间分辨率更高、功耗更低,易于实现小型化。DDA代表了新一代的卫星测高技术,特别适合海洋、海岸带和极冰的测量。该文就DDA测量机理、波形仿真和精度分析进行了研究。

Delay doppler radar altimeter(DDA) is a new radar altimeter,which utilizes aperture synthesize to improve the measurement performance.Compared with conventional radar altimeter,DDA has the resolution along track being increased by 10 times,the transmitted peak power being reduced by 10dB,and the measurement precision of altitude being improved to 2cm.The higher measurement precision,the higher space resolution,and the lower transmitted power make DDA feasible to realize miniaturization.DDA represents a new generation of radar altimeter,and it is suitable to survey ocean,coastal zone,and polar ice.In this paper,the mechanism,the simulation of waveforms,and the precision analysis of DDA are discussed.