被动测向技术因其隐蔽性好、安全性高等优点而被广泛应用在电子对抗、航海和航空等领域。目前基于天线阵列的高分辨测向技术是人们研究的热点,但MUSIC算法计算量大,对系统硬件的要求较高,进行工程实现有一定的难度。ESPRIT算法虽然减小了计算量但它对阵列的形状有约束。因此研究一种计算量小、实时性高、对阵列形状没有约束,并且易于工程实现的被动测向算法有重要意义。虚拟时间反转(Virtual Time Reversal-VTR)技术与主动时间反转(Time Reversal-TR)技术不同,它不是将天线阵列接收到的信号发送回介质空间中,而是利用计算机模拟生成时间反转信号,并找到时反信号的聚焦峰。本文将VTR技术应用到对通信电台的被动测向算法中,通过沿xoy平面内的矩形环线扫描来估计信源的方位角,沿竖直平面的矩形环线扫描来估计俯仰角,并对算法的原理给出了严谨的数学推导。此外,利用SystemView软件搭建了被动测向系统并进行了仿真实验。在被动测向系统中,十字型天线阵列的各阵元接收到的射频信号经过限带滤波器后进行下变频变为中频信号,该中频信号被存储以便采用VTR算法和其他对比算法进行信源的DOA估计。文中对测向系统的关键...
【英文摘要】
Passive direction finding technology is widely used in electronic countermeasure,navigation, aviation and other fields because of its good concealment and high safety performance. Currently, the high resolution direction finding technique based on antenna array is a research hotspot. The MUSIC algorithm has a large amount of calculation and high requirement for the system hardware, so it has difficulty in engineering implementation.Although ESPRIT algorithm reduces the calculation,it has constraints on the ...