An FMCW Ranging Method with Identification Ability

Frequency modulated continuous wave (FMCW) radar has been widely used and thoroughly studied in high precision ranging. However, FMCW radar cannot identify target type while ranging. To address this problem, this paper presents a high-precision ranging method based on FMCW, which enables the FMCW radar to identify target type while ranging. The proposed method improves the ranging accuracy by performing frequency sweep in a specific frequency range and realizes target identification through the orthogonal spread spectrum. The designed prototype verification system operates at a frequency of 5.8 GHz and the sweep bandwidth is 200 MHz. Exemplary experiment results are presented to illustrate that the system has a ranging accuracy of 20 cm and a range of up to 12 m in an indoor scenario. Furthermore, multiple user identification can also be realized.