直接射频采样的L波段星载SAR数字接收机设计

Design of L band space-borne SAR digital receiver using direct RF sampling

设计了一种直接射频采样的L波段星载合成孔径雷达(SAR)数字接收机.适当选取射频采样频率,优化了数字正交解调结构.为减轻数据存储和传输的压力,实现了压缩比可变的分块自适应量化模块.直接射频采样简化了电路设计,提高了SAR系统的精确性和灵活性,仿真结果证明该设计技术可行、有效.

This paper presents a design of L band space-borne SAR digital receiver using direct RF sampling.Appropriate RF sampling frequency is selected and digital quadrature demodulation structure is improved.In order to reduce the volume of data that is stored onboard and later transmitted to ground station,a block adaptive quantization（BAQ） module with flexible compression ratio is developed.Simple electrical system design and advanced SAR system are achieved by using direct RF sampling.Feasibility and performance are verified by experimental results.