步进变频穿墙成像雷达中反投影算法研究

Back-Projection Algorithm to Stepped-Frequency Through-the-Wall Radar Imaging

反投影(back-projection,BP)算法具有很高的成像精度并容易进行各种形式的补偿,是广泛应用于穿墙、探地等领域的一种有效的时域成像算法。该文把时域反投影算法应用到步进变频穿墙雷达成像中,并根据墙壁的参数提出了用最短时间法对墙壁的影响进行补偿。通过对实测数据的处理可以看出,反投影算法在穿墙雷达中具有很好的成像精度,最短时间法也能很好地补偿墙壁对目标成像位置的影响。

Back-projection imaging algorithm is widely used in through-the-wall and ground penetrating radar（GPR） imaging because of the high image quality and being compensated easily. This paper introduces the Back-Projection（BP） algorithm to the stepped-frequency through-the-wall radar and proposes the time-minimization method to eliminate the wall＇s effects, such as refraction, changing in speed and attenuation. Proof of concept is provided using real data collected in a laboratory environment. The results show that the BP algorithm outputs a highquality image and the time-minimization method can eliminate the wall＇s effect very well.