Doppler estimation using a coherent ultrawideband random noise radar
Ram M. Narayanan, Muhammad Dawood, Robert D. Mueller, Robert D. Palmer · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1997
An ultrawideband random noise (white Gaussian noise) radar system operating in the 1 - 2 GHz frequency range has been used to estimate the Doppler spectra of moving objects. A unique technique has been developed to introduce coherence into the system by performing heterodyne correlation of the received signal with the time delayed replica of the transmitted signal. This operation preserves the phase of the reflected signal which is generally lost in traditional homodyne correlation receivers. Knowledge of the phase of the received signal and its time dependence due to the motion of the target permits the system to be configured as a Doppler radar for detecting both linear and rotational motion. This paper describes the basic theory of random noise Doppler radar and presents simulated and experimental results obtained using the University of Nebraska's 1 - 2 GHz random noise radar system.