Short-Range Indoor Positioning and Tracking Under Monochromatic Illuminations

In complex indoor environments, positioning and tracking of passive targets remain a significant technical challenge, mainly due to severe multipath scattssering. Continuous-wave (CW) radar, immune to static multipath, provides a promising solution to this challenge, with frequency-modulated CW (FMCW) radar being the mainstream approach. However, existing solutions have poor performance in short-range measurements. In this work, three independent, single-frequency, CW radars were used to form a positioning network with high spectral efficiency. Dedicated algorithms were implemented to enable fast and accurate data demodulation and processing. By measuring the displacement of a moving target, passive positioning and tracking can be achieved in complex indoor environments, particularly suitable for short-range applications. Both simulations and experimental results verified the effectiveness and accuracy of the proposed approach.