Location tracking of indoor movers using a two-frequency Doppler and direction-of-arrival (DDOA) radar

Two-dimensional bearing and range tracking of multiple indoor movers using a two-frequency Doppler and DOA radar have been presented. Measurements were performed using a low-cost, two-element receiver array operating at two continuous wave (CW) tones. The attractiveness of the system is that it has very low complexity. However, its performance is dependent on the Doppler separation between the targets