Angle Estimation Using an Active 38 GHz Interferometric Radar

Abstract

The operation of a millimeter-wave interferometric radar for estimating the angle of a target is discussed in this paper. The transmitter emits a linear frequency modulated (LFM) signal, ranging from 37 GHz to 39 GHz. The millimeter-wave interferometric receiver is composed by two receive antenna elements separated by 51 cm (64.6λ). The number of sidelobes in the radiation pattern will change as a function of frequency, generating a frequency response that can be transformed to the angle of a target. The theory behind the technique is explained, supported by the experimental measurements.