Indoor Localization for Passive Moving Objects Based on a Redundant SIMO Radar Sensor

In the past decade, many efforts have been devoted to indoor localization solutions. While significant progresses have been achieved, short-range localization of passive moving objects in indoor environments remains a technical challenge, especially when available radio spectrum is limited. In this paper, we resolve this challenge by proposing a single-frequency continuous-wave Doppler radar sensor implemented with a redundant single-input multiple-output architecture. Since only Doppler phase shift information is used in the proposed tracking-localization solution, the localization is naturally immune to stationary clutters such as walls and furniture, making this indoor localization only responsive to moving objects. Only using a single frequency is required, such an indoor localization can be implemented with the highest spectrum and energy efficiency. The obtained results imply the potential for the detection of human activities and vital signs in indoor environments with strong stationary scatters.