Egral radar phase comparison system for object recognition19730306

Claim 1

A radar system of recognizing signal scattering targets of interest such as tanks and aircraft by the characteristic phase shifts of the reflected scattered signals therefrom comprising means to generate a multiplicity of frequency stable non-integral signals, each having a different frequency and being in coherent-harmonic relationship, separate means to amplify the power of each of said multiplicity of non-integral signals, means to transmit each of said power amplified multiplicity of non-integral signals toward the target of interest, antenna means receiving a multiplicity of reflected signals from said target, said multiplicity of reflected signals being equal to said multiplicity of transmitted signals, a multiplicity of receiveRs, said multiplicity of receivers including a separately tuned receiver for each of said multiplicity of reflected signals, a separate phase detector for each output of each of said receivers, to provide a first input thereto, each of said phase detectors simultaneously receiving as a second input one of said generated signals with a frequency identical to said first input, a scaler having a preselected constant for each output of each phase detector, and means to compare the voltage difference between each pair of scalers to provide a set of difference signals, said set of difference signals being representative of the target of interest.