| 主权项 |
1. A radar apparatus comprising:
a transmitter antenna that transmits an unfocused frequency modulated transmit signal having a transmit bandwidth towards a scene potentially comprising one or more targets, a receiver antenna that receives a receive signal reflected from said scene in response to the transmission of said transmit signal, a mixer that mixes said receive signal with said transmit signal to obtain a mixed receive signal, a sampling unit that samples said mixed receive signal to obtain receive signal samples from a period of said receive signal, a processor that processes said receive signal samples by
defining a spatial grid in the scene with a finer grid resolution than obtainable by application of a synthetic aperture radar algorithm on the receive signal samples anddetermining reflectivity values at grid points of said spatial grid by defining a signal model including the relative geometry of said transmitter antenna and said receiver antenna with respect to the scene, said transmit signal and said spatial grid and applying compressive sensing on said receive signal using said signal model. |
