Unambiguous range-doppler processing method and system
AssigneeThe United States of America as represented by the Secretary of the Air Force
InventorsPaul Van Etten, Michael C. Wicks
Life of this patent
Estimating the term…
Abstract
Range-Doppler ambiguity is eliminated from an ultra-wideband radar system by transmitting an ultra-wideband chirped pulse towards a moving target, and mixing it with the doppler-shifted chirped pulse which is received as a target echo return signal. Multioctave radar tracing systems can potentiality track stealth aircraft without ambiguity since pulses containing many frequencies can defeat narrow-band radar absorbing material coatings. The unambiguous range-doppler signal processing method mixes the chirped pulse to yield an instantaneous Doppler frequency (which indicates target velocity) and a rate of change in the instantaneous Doppler frequency (which indicates target acceleration).
Claims17
A process for use with a radar system for measuring an unambigiuous Range-Doppler measurement of a target's velocity, said process comprising the steps of:
- transmitting an ultra-wideband chirped pulse from said radar system;
- receiving a Doppler-shifted chirped pulse as a target echo return signal from said target;
- and
- determining said target's velocity using both said chirped pulse and said Doppler shifted chirped pulse to determine said measurement thereby.
An ultra-wideband radar system for tracking a moving target, and which comprises:
- a means for transmitting an ultra-wideband chirped pulse pair towards said moving target;
- a means for receiving a Doppler-shifted chirped pulse pair, said Doppler-shifted chirped pulse pair being a target echo return signal which occurs when said ultra-wideband chirped pulse pair is reflected off of said moving target;
- and
- a means for processing signals which receives said Doppler-shifted chirped pulse pair from said receiving means, and measures said moving target's velocity, range and position therefrom.
Dependencies are inferred from the claim text.