L波段散射计系统仿真研究
Acta Electronica Sinica 전자학보（2023）
Abstract
对于海表盐度微波遥感，海面粗糙度引起的辐射亮度温度变化与海表盐度的贡献相当甚至更大。因此，海表盐度遥感不仅要利用对盐度敏感的L波段微波频率进行高精度的辐射亮温测量，还要利用同步搭载的L波段散射计获取海面粗糙度信息并进行矫正，这对于提高海表盐度测量精度具有重要作用。本文针对我国首个海面盐度遥感卫星主被动微波盐度计的L波段散射计开展研究，建立了一种多波束推帚式星载微波散射计的系统仿真模型，对比分析了雷达脉冲参数对该系统测量精度的影响，并进行了信号带宽和不同极化方式脉冲数配置的优化设计。研究表明，在L波段散射计的基线参数下，脉冲带宽为1. 5 MHz、脉冲重复频率为100 Hz时，可实现同极化后向散射测量精度优于0. 1 dB的指标。
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