Dual Frequency Doppler Radars for Indoor Range Estimation: Cramr-Rao Bound Analysis
نویسندگان
چکیده
Single frequency Doppler radars are effective in distinguishing moving targets from stationary targets, but suffer from inherent range ambiguity. With a dual-frequency operation, a second carrier frequency is utilized to overcome the range ambiguity problem. In urban sensing applications, the dual-frequency approach offers the benefit of reduced complexity, fast computation time, and real time target tracking. We consider a single moving target with three commonly exhibited indoor motion profiles, namely, constant velocity motion, accelerating target motion, and micro-Doppler motion. RF signatures of indoor inanimate objects, such as fans, vibrating machineries, and clock pendulums, are characterized by micro-Doppler motion, whereas animate translation movements produce linear FM Doppler. In this paper, we derive Cramér-Rao bounds (CRB) for the parameters defining indoor target motions under dual-frequency implementations. Experimental data is used to estimate micro-Doppler parameters and to validate the CRBs.
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