Impact of MIMO Configuration on Multi-Target Detection Capability of Through the Wall Radar

Through the wall radar (TWR) is a technology to detect the presence of an object behind a wall. Recently, the need to detect multiple objects simultaneously has driven an improvement for this technology. A problem is coming when the distance between two or more objects is too close. They may interfere with each other and decrease its detection accuracy. To improve the detection accuracy, Multiple-Input Multiple-Output (MIMO) method with the finite-difference time-domain (FDTD) modeling for 2-dimensional TWR is presented. A pair of simulation schemes, Single Input Single Output (SISO) and MIMO, has been done to examine this method's performance by changing the object's gap. It compares the B-Scan result of three schemes. This result shows that MIMO can increase the detection resolution and to separate two objects which are very close to each other despite they have different SNR. Furthermore, if both objects' SNR are similar, the MIMO detection ability is going better when compared to SISO.