Indoor Target Tracking Using Dual-Frequency Continuous-Wave Radar Based on the Range-Only Measurements

Abstract

A dual-frequency continuous-wave (DF-CW) radar is a cost-effective device for multiple target tracking in indoor environments. The traditional DF-CW radar adopts a quasi-monostatic structure to acquire the target range and direction of arrival (DOA), to position the target. However, the traditional DF-CW radar usually suffers from the drawbacks of low positioning accuracy, biased target information, and severe ambiguous frequency interference. For overcoming these drawbacks, the traditional DF-CW radar structure is modified, and an improved target tracking algorithm, which is based only on the range measurements, is proposed in this article. Compared with the traditional DF-CW radar-based detection, the proposed algorithm can achieve not only higher positioning accuracy, reveal more abundant and precise target information, but can also help to suppress the ambiguous frequency interference, which is of great importance in the multiple target tracking scenarios. Besides, the proposed DF-CW radar can also effectively reduce the coupling interference, thus contributing to the improvement of the dynamic range of the radar. A series of experiments are conducted to demonstrate the effectiveness of the proposed algorithm, and the obtained results illustrate a better performance of the proposed algorithm compared with the traditional algorithms.