Frequency-encoding technique for active MMW imaging

A novel method of millimetre wave active imaging at video frame rate is proposed that does not require a sensor array, using the transmitter to encode the scene as a function of frequency. Image reconstruction is performed digitally, so a large potential reduction in system complexity may be realised. We show how resolution can be improved by coherent processing, and demonstrate the technique by a simple experiment. Finally the requirements for design of the transmitter aperture are considered.