Communications – electrical: acoustic wave systems and devices – Echo systems – Side scanning or contour mapping sonar systems
Patent
1979-11-07
1981-09-01
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Echo systems
Side scanning or contour mapping sonar systems
367102, 367100, G01S 1504, G01S 1589
Patent
active
042875781
ABSTRACT:
A method and apparatus is disclosed for use of a linear frequency chirp in a transmitter/receiver (14/16) having a correlator to synthesize a narrow beamwidth pattern from otherwise broadbeam transducers when there is relative velocity between the transmitter/receiver (14/16) and the target. The chirp is so produced in a generator (20) in bandwidth, 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 (26) is time delayed and Doppler shifted for use as a reference in receiver (16) 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.
REFERENCES:
patent: 3302162 (1967-01-01), Rowlands
patent: 3484737 (1969-12-01), Walsh
patent: 3798590 (1974-03-01), Jacobson et al.
patent: 3805222 (1974-04-01), Pekau
patent: 3827022 (1974-07-01), Booth
patent: 3890618 (1975-06-01), Speiser
patent: 3969725 (1976-07-01), Couvillon et al.
patent: 4088978 (1978-05-01), Gilmour
Nawar et al., "A Pulse Compression Echo Sounder for Ocean Bottom Surveys", Journal of Geophysical Research, Nov. 15, 1966, pp. 5279-5282.
Farley Richard A.
Manning John R.
McCaul Paul F.
Mott Monte F.
The United States of America as represented by the Administrator
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