天线主瓣照射区多普勒谱分布规律研究  

Doppler Spectrum Distribution Law in the Area Radiated by Antenna Mainlobe

作　　者：朱晓菲 李东 沈晓卫 曾振杰 ZHU Xiaofei;LI Dong;SHEN Xiaowei;ZENG Zhenjie(Rocket Force University of Engineering,Xi'an 710025,China)

机构地区：[1]火箭军工程大学,西安710025

出　　处：《电光与控制》2021年第1期52-55,85,共5页Electronics Optics & Control

摘　　要：为了研究雷达高度表相对于地面运动时天线主瓣照射区内多普勒谱分布规律,建立了大地回波宽多普勒带模型,利用基于等多普勒带、等距离环的网格映像法将波束照射区划分为若干矩形散射网格,采用等多普勒带内各矩形网格回波功率叠加的方法对回波多普勒功率谱进行仿真,克服了基于极坐标积分法计算繁琐且不利于后续工程实现的缺点,仿真结果与理论值相符,表明模型合理,最后分析得出了雷达高度表在不同高度及速度下多普勒谱分布规律,为后续雷达高度表的回波模拟提供了理论支撑。In order to obtain the law of Doppler spectrum distribution in the area radiated by the antenna’s mainlobe when the radar altimeter moves relative to the ground,a wide-band Doppler echo model is established,and the beam irradiation area is divided into several rectangular scattering grids by using the grid mapping method based on the equal Doppler band and the equal distance ring.The simulation of echo Doppler power spectrum is conducted by using the method of echo power superposition of each rectangular grid in the equal Doppler band.It overcomes the shortcomings of complicated calculation based on the polar-coordinate integration method,which is not conducive to the subsequent engineering realization.The simulation results are consistent with the theoretical values,which shows that the model is reasonable.Finally,the law of Doppler spectrum distribution of the radar altimeter at different altitudes and speeds is obtained,which provides a theoretical support for the subsequent echo simulation of the radar altimeter.

关 键 词：雷达高度表 回波模拟 网格映像法 多普勒谱分布 

分 类 号：TN955.2[电子电信—信号与信息处理]