反导预警雷达部署方案的评价与优选

合理部署反导预警雷达对提高反导作战效能起着重要作用。反导预警雷达部署要考虑的因素较多,部分因素存在冲突。本文分析了反导预警雷达部署评价应考虑的因素,提出了相关评价指标,主要有不同配置距离下雷达对目标的发现概率、提供的预警时间、落点预报精度、全程跟踪目标时长等,建立了不同评价指标的计算方法,给出了反导预警雷达部署方案的综合评价与优选方法。本文方法对反导预警雷达部署方案的建立优选具有指导意义。     

A novel signal processing approach for LEO space debris based on a fence-type space surveillance radar system

The increase in space debris can seriously threaten regular activities in the Low Earth Orbit (LEO) environment. Therefore, it is necessary to develop robust, efficient and reliable techniques to understand the potential motions of the LEO debris. In this paper, we propose a novel signal processing approach to detect and estimate the motions of LEO space debris that is based on a fence-type space surveillance radar system. Because of the sparse distribution of the orbiting debris through the fence in our observations, we formulate the signal detection and the motion parameter estimation as a sparse signal reconstruction problem with respect to an over-complete dictionary. Moreover, we propose a new scheme to reduce the size of the original over-complete dictionary without the loss of the important information. This new scheme is based on a careful analysis of the relations between the acceleration and the directions of arrival for the corresponding LEO space debris. Our simulation results show that the proposed approach can achieve extremely good performance in terms of the accuracy for detection and estimation. Furthermore, our simulation results demonstrate the robustness of the approach in scenarios with a low Signal-to-Noise Ratio (SNR) and the super-resolution properties. We hope our signal processing approach can stimulate further work on monitoring LEO space debris.     

Using S-band dual polarized radar for convective/stratiform rain indexing and the correspondence with AMSR-E GSFC profiling algorithm

The separation of rain types in convective and stratiform regimes has long been a goal in microwave remote sensing of precipitation research. In this essence, a dual polarized radar based indexing scheme that provides information on convective and stratiform (C/S) rain regimes has been presented in correspondence with advanced microwave scanning radiometer – earth observing system (AMSR-E) GSFC profiling algorithm estimate of convective rain percentage. The dual polarized radar based C/S indexing scheme first retrieves the normalized gamma drop size distribution parameters, median volume drop diameter (D₀) and concentration parameter (N_w), from dual polarized radar measurements Z_H and Z_DR, representing reflectivity and differential reflectivity respectively, by means of the genetic programming approach. Next, the C/S rain index is calculated based on the formulation of an empirical relation in N_w–D₀ domain. The scheme has been inspected and applied on measurements from the S-band Chilbolton dual polarized radar. A considerable number of “coincident” cases from the radar and the AMSR-E observations are investigated. It has been revealed that the dual polarized radar based C/S rain indexing is in a similar pattern with the AMSR-E GSFC profiling algorithm estimate of convective rain percentage. Generally, as C/S rain index value increases, which signifies a stratiform to convective trend, the AMSR-E convective rain percentage also increases.     

浅析波音737 NG气象雷达的放行限制

从机组运行和机务维修两个方面对气象雷达失效的放行限制进行了综合的分析评估,并对气象雷达系统进行由简到繁的排故介绍,为航线放行提供参考。     

多雷达跟踪处理在空中交通管制领域的应用

多雷达跟踪处理系统是目前国际上最先进的空中交通管制（ＡＴＣ）系统,广州空中交通管制中心是国内第一家使用融合式多雷达处理方式的管制中心。描述了目前国际上实现多雷达跟踪的几种方法,并结合广州空中交通管制中心多雷达跟踪处理系统的建设,指出我雷达跟踪处理系统建设过程中需要解决的几个问题及解决方法。     

基于遗传算法的一种高分辨率雷达目标识别方法

目标识别是防空信息处理中的一个重要环节,而对空中目标类型的识别还没有成熟的理论。通过对高分辨雷达回波信号的分析,在遗传算法的基础上,提出了一种高分辨雷达目标识别方法,由此进行目标识别。仿真实验结果表明,该方法具有高的识别率和强的抗干扰能力。     

反辐射导弹雷达导引头的总体设计概述

 本文首先简要叙述了国外反辐射导弹的发展概况,归纳了反辐射导弹的5个主要特点。反辐射导弹雷达导引头是反辐射导弹的重要组成部分,文中提出了反辐射导弹雷达导引头的主要战术技术指标,着雷讨论了进行导引头总体设计时的几个主要问题。     

航迹规划中雷达探测空间的生成

从飞机突防习行任务规划出发，综合考虑地球曲率、陆地（或海洋）的反射和杂波干扰、大气折射和吸收损耗等因素的影响，采用临界散射截面法生成了对空警戒雷达在不同地貌、发现概率下，对不同雷达散射截面的目标的探测空间。计算并分析了飞行高度、目标雷达散射截面、发现概率和地貌等因素对雷达探测空间的影响，以便选择低探测概率的飞行走廓，这对制定和实施安全突防飞行策略有实际意义。     

天波超视距雷达的发展

 天波超视距雷达 (OTHR)是一种利用电离层对高频信号的反射作用自上而下进行目标探测的雷达体制。由于该雷达具有大范围的监视能力、防低空突袭、抗隐身以及早期预警等突出优点 ,受到了许多国家的重视。首先介绍了OTHR的性能特点及发展历史 ,接着就雷达的总体结构、干扰的抑制、由电离层引起的信号失真的校正 ,以及信号检测进行了全面的综述 ,最后指出这一领域今后的发展方向。     

机动目标的逆合成孔径雷达成像

 逆合成孔径雷达(ISAR)和合成孔径雷达 (SAR)都是利用目标 (场景)与雷达的相对运动,提高横向分辨率,实现对目标 (场景 )的成像。SAR的运动方是雷达平台,可控制作平稳飞行,且用仪器测校其偏离误差;ISAR的运动方通常是非合作目标,运动不受控制,且难以精确测量。当目标作机动飞行时,以目标作固定基准,雷达等效地在空间形成流形复杂的逆合成孔径 (阵列 ),对这种情况下成像的问题进行了系统的研究。