Abstract
Interferometric radars enable the direct measurement of the angular velocity of moving objects by estimating a frequency shift imparted as objects passing through the interferometer grating lobe pattern. Highly effective when implemented at millimeter-wave frequencies, angular velocity measurements manifest from the time-varying phase shift between widely separated antenna elements. When implemented with a direct-downconversion architecture, the hardware is greatly simplified, however the time-varying phase shift only manifests when a residual frequency shift is present on the scattered signals from radial motion of the targets. When this motion is negligible, the differential phase and thus the interferometric frequency shift fails to manifest. In this work we present a bound on radial velocity and integration time in interferometric radar measurements of angular velocity using direct downconversion architectures.
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