星载双面多波束相控阵GNSS-R海洋微波遥感器设计

Design of GNSS-R Ocean Microwave Remote Sensor Based on Satellite Borne Double-Face Multi-Wave Beam Phased Array Antenna

为实现对多个海面区域覆盖,对星载全球导航定位系统反射信号(GNSS-R)海洋微波遥感器设计进行了研究。遥感器采用层叠式双面多波束高增益相控阵天线,通过在轨镜面反射点快速搜索和波束调度,接收北斗或GPS系统发射的直射信号和海面反射信号,经原始信号采样、时延多普勒相关功率计算等处理,为全球海面风场反演和海面高度测量提供高时效微波遥感数据。给出了系统指标和组成、工作模式,以及星载层叠式双面多波束相控阵天线、星载镜面反射点预测和星载GNSS-R高精度海面测高等关键技术及实现途径。仿真和计算结果表明:系统测高精度22cm,可满足系统指标要求。实际测高精度待飞行试验验证。

In order to achieve coverage of multiple sea surface areas, the design of satellite borne GNSS-R ocean microwave remote sensor was studied in this paper, in which the stacked double-lace multi-wave beams phased array antenna with high gain was adopted. The direct signals from BD or GPS system and reflected signals from ocean were received. The time sensitive microwave sensing data for global sea surface wind field inversion and ocean altimetry after original signal sampling and calculation of time delay-Doppler correlation power were provided by applying the algorithm of fast scan of specular point in orbit and beam scheduling. The performance and composition, operation mode of the system were given out. And so were the key technologies and implementment that were stacked double-face multi-wave beams phased array antenna, prediction of the specular point in orbit and high precision ocean altimetry. The simulation and computation results showed that the altimetry accuracy of the system was 22 cm which could meet the requirement. The real accuracy would＇be approved by flying test.