雷达信号回波检测-雷达.doc
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内容摘要
雷达回波的信号检测
假设目标散射面积脉内不起伏,脉间起伏特性自定。
利用雷达方程,进行雷达回波信号的仿真。
在目标距离处,对有无信号条件下的概率密度函数进行估计
若脉冲内只有一个采样点,采用最小错误率贝叶斯判决方法进行目标检测,统计虚警率和漏警率。
要求虚警率不大于10-5,试计算判决阈值并进行目标检测,统计虚警率和漏警率。
雷达的战术性能包括目标探测范围、测量目标精度、目标分辨力、目标数据率、抗干扰能力、可靠性、雷达体积重量、功耗及部署时间、同时测量的目标数量等。不同用途的雷达有不同的战术性能要求,远程对空警戒雷达要求较大的探测距离,舰船避碰雷达要求较高的距离和角度分辨力,对海搜索雷达要求有较好的抗海杂波干扰能力,攻击雷达对数据率、精度要求高,而作用距离只需要满足攻击武器的最大攻击距离即可。
1.1雷达载频与雷达用途......
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%此段程序规定了雷达工作的重要参数,仿真了发射波,利用雷达方程仿真了目标散射回波
ts=5e-9;
% 抽样频率200MHzfs=1/ts;fc=5e7;
% 载频50MHzprt=2e-5;
% 脉冲重复周期PRTprf=1/prt;
% 脉冲重复频率PRFN=20;
% 产生的信号周期数c=3e8;
% 光速也即是无线电波的传播速度dist=2e3;
% 假设待测目标距离雷达的距离pt=1e6;
% 发射功率1MWar=3;
% 雷达天线收发面积3平方米lamada=c/5e8;
% 载波波长rcs=20;
% 目标雷达散射截面积20平方米%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%t=ts:ts:1/prf-ts;
% 抽样频率200MHzsin_one=sqrt*sin;
% 单周期正弦波rect_one= 1)/2;
% 单周期方波t=ts:ts:N*;
% 抽样频率200MHzsin_N=[];for i=1:Nsin_N=[sin_N,sin_one];
% N周期正弦波endrect_N=[];for i=1:Nrect_N=[rect_N,rect_one];
% N周期方波endsig=sin_N.*rect_N;
% 方波对正弦波进行调制,产生单载频信号%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%tao_t=2*dist/c;
% 延迟的时间tao_T=floor;
% 延迟的抽样周期数 pr=pt*ar*ar*rcs/*); % 根据雷达方程计算出回波功率Am=sqrt;
% 回波信号的幅度so=zeros;
% 经过时间延迟和计算出的回波信号幅度仿真回波信号s=1:length;so=Am*sig/1e3;t=ts:ts:N* tao_t;noise=wgn,10*log10-3);
% 产生高斯白噪声so=so noise;
% 高斯白噪声叠加在回波信号d_rect_N=zeros);d_rect_N=rect_N;%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
2022-02-22 14:22:54
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