Abstract
In TWR (Through Wall Radar) signal processing procedure, time delay estimation is one of the key steps in target localization and high resolution imaging. In time domain imaging procedure such as back projection imaging algorithm, round trip propagation time delay at the path of “transmitter-target-receiver” needs to be calculated for each pixel in imaging region. In typical TWR scenario, transmitter and receiver are at one side and targets at the other side of a wall. Based on two-dimensional searching algorithm or solving two variables equation of four times, traditional time delay calculation algorithms are complex and time consuming, and cannot be used to real-time imaging procedure. In this paper, a new fast time-delay (FTD) algorithm is presented. Because of that incident angle at one side equals to refracting angle at the other side, an equation of lateral distance through the wall can be established. By solving this equation, the lateral distance can be obtained and total propagation time delay can be calculated subsequently. Through processing simulation data, the result shows that new algorithm can be applied effectively to real-time time-delay calculation in TWR signal processing.
Highlights
TWR is widely used in various application scenarios, while it ensures that researchers obtain quantitative and qualitative information in the media [1]
Electromagnetic waves propagate from the starting point A on the one side of the wall, and the incident point C is at the upper surface of the wall, waves refract out of the wall on the lower side at point D after transmitting a distance in the wall, reach the receiving point B
We define the top surface of the wall as z 0, z is the vertical coordinate, the starting point's coordinate position is xa, za, and the receiving point's coordinate position is xb, zb
Summary
Abstract.In TWR (Through Wall Radar) signal processing procedure, time delay estimation is one of the key steps in target localization and high resolution imaging. Because of that incident angle at one side equals to refracting angle at the other side, an equation of lateral distance through the wall can be established. By solving this equation, the lateral distance can be obtained and total propagation time delay can be calculated subsequently. The result shows that new algorithm can be applied effectively to real-time time-delay calculation in TWR signal processing
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