Millimeter-Wave Radar Imaging Using Multistatic Coprime Array Configuration for Invisible Object Testing

Some existing radar imaging apparatuses require a large number of transmitting and receiving antennas and, thus, impose stringent requirements on hardware design. In this article, we propose a millimeter-wave radar imaging method that combines multistatic radar with coprime measurements, to significantly reduce the number of antennas and the amount of data. The proposed radar array system replaces every monostatic radar with a pair comprising a separated transmitter and receiver along with phase corrections. Since multiple receivers can simultaneously receive the reflection when a transmitter emits a signal and then efficiently create virtual subarrays obtained by coprime measurements, the proposed radar array system can further reduce the number of measurements (antennas) and the amount of data compared with the existing schemes. Our proposal is demonstrated through simulations and experiments, and the results indicate that the proposed radar array system is advantageous in implementation in terms of hardware design and data acquisition time.