G - Physics – 01 – S
Patent
G - Physics
01
S
349/34, 343/50
G01S 15/89 (2006.01) G01S 13/26 (2006.01) G01S 15/02 (2006.01) G01S 15/10 (2006.01)
Patent
CA 1151283
ABSTRACT A method and apparatus for using a linear frequency chirp in a transmitter/receiver having a correlator to synthesize a narrow beamwidth pattern from otherwise broadbeam transducers when there is relative velocity between the transmitter/receiver and the target. The chirp is so produced in a generator in band- width, B, and time, T, as to produce a time-bandwidth product, TB, that is increased for a narrower angle. A replica of the chirp produced in a generator is time delayed and Doppler shifted for use as reference in receiver for correlation of received chirps from targets. This reference is Doppler shifted to select targets preferentially, thereby to not only synthesize a narrow beam but also aim the beam in azimuth and elevation.
362892
G. Ronald Bell & Associates
National Aeronautics And Space Administration
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