采用WiMAX信号的无源SAR成像方法

无源雷达自身不发射信号,依靠外部照射源实现对目标的探测或成像。现代通信的发展为无源雷达提供了更多的可用外部照射源,如全球移动通信信号、卫星导航信号、无线网络信号(WiFi)等。WiMAX是一项新兴的基于IEEE 802.16标准的宽带无线城域网技术,其作为无源雷达照射源,相比已有照射源具有距离分辨率高和探测距离远的优点。文中给出了一种利用WiMAX信号进行无源SAR成像的方法,推导出获得一维距离像的匹配滤波器,并实现了二维WiMAX-SAR成像。仿真结果验证了采用WiMAX信号进行SAR成像的可行性。

A Passive SAR Imaging Method Using WiMAX Signal

Passive radar doesn＇t transmit signal itself, but relies on illumination sources of opportunity to realize target detection or imaging. The modern communication provides more available illuminators of opportunity for passive radar, such as GSM communication signals, GPS signals, WiFi signals, etc. WiMAX is a new broadband wireless access technolo- gy of metropolitan area network（MAN） based on IEEE 802.16 standard. As a possible illuminator of passive radar, it pro- vides higher range resolution and larger detection range as compared with existing illumination sources. An image formation method for passive synthetic aperture radar（SAR） by using WiMAX signal is presented. A matched filter for WiMAX signal is derived to get the one-dimensional range profile, and then the two-dimensional WiMAX-SAR imaging is achieved. Simulations are performed to demonstrate the effectiveness of the WiMAX-SAR imaging method.