Development of FM-CW Radar System for Detecting Closed Multiple Targets and Its Application in Actual Scenes

In this paper, detection method for 24 GHz band FM-CW radar system under closed multiple targets with small displacements environment was proposed, and its performances were analyzed by using computer simulation. The proposed detection method used a differential detection method for removing any signals from background objects, and also used a tunable FIR filtering in signal processing for detecting multiple targets. The proposed detection method enabled to detect both the distance and small displacement at the same time for each target correctly from the received signal including all of signals from the targets at the FM-CW radar. The basic performances for FM-CW radar were analyzed in computer simulation, and field experiments for detecting target under actual environments. The results showed that the proposed differential detection could only measure the desired targets, and the human breathing could also be detected in a hospital scene. Furthermore, under closed multiple targets environments, we showed the problems for detecting both distance and small displacements of multiple targets at the same time by using a single radar. Computer simulations were carried out for evaluating the proposed detection method with the tunable FIR filtering for FM-CW radar and analyzing the performance according to the parameters under closed multiple targets environment. The results in computer simulation showed that the proposed detection method could detect both the distance and small displacement correctly under closed multiple targets environment. TYPE OF PAPER AND