Electrical & Computer Engineering, Department of
Date of this Version
2000
Abstract
The University of Nebraska has developed an ultra-wideband (UWB) random noise radar system which transmits an ultra-wideband random noise (Gaussian) waveform with a uniform power spectral density (PSD) in the 1-2 GHz frequency range. The ability of the system to characterize the Doppler shift of moving targets exhibiting varying linear and rotational velocities was clearly demonstrated [l, 2]. In this paper, we look at the range and range rate resolution issues by analyzing the Woodward’s ambiguity function [3]. In general, the radar signal ambiguity function is defined as the normalized response of a filter matched to a return signal with range rate V0 to a return signal with range rate V1. It describes the resolution properties of a given signal in range and range rate. However, for a random noise radar a correlator matched to transmit process is required. Therefore, an analogous ambiguity function may be defined as the expected value of the response of the correlator matched to a target moving with range rate V0, to the return signal from the target with range rate V1. Moreover, for a UWB transmit random process, the compression or stretch due to the range rate on the envelope of the return process cannot be ignored.
Comments
Published in IEEE Antennas and Propagation Society International Symposium, 2000. Vol. 4, pp. 2142-2145; doi: 10.1109/APS.2000.874917 Copyright 2000 IEEE. Used by permission.