Communications: directive radio wave systems and devices (e.g. – Synthetic aperture radar
Patent
1995-07-06
1996-07-23
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Synthetic aperture radar
342 90, 342107, 342108, 342115, 342162, 342163, G01S 1390
Patent
active
055394086
ABSTRACT:
In a method for the detection, localization and velocity determination of moving targets from raw radar data from a coherent, single- or multi-channel image system (SAR), for representing the surface of the earth with different backscatter ratios, chronologically successive azimuth spectra are continuously formed during a defined period of time and a frequency shift of the backscatter ratio portion is obtained by determining the position of the maximum of the correlations between respectively two azimuth spectra formed chronologically directly in succession. Then the frequency shifts of the entire raw radar data set are evaluated for producing a frequency shift map.
By searching for values deviating from the nominal Doppler rate in the Doppler rate map, a respective moving target is detected and the center of an image of the detected moving target is formed from this.
By neglecting its radial acceleration, the tangential velocity of the moving target is determined by means of a Doppler rate taken from the Doppler rate map, and finally the radial velocity of the moving target is determined from the ratio of a length of the moving target in the range direction on the Doppler rate map and the duration of a scanning time by the antenna.
REFERENCES:
patent: 4053885 (1977-10-01), Tomita et al.
patent: 4321601 (1982-03-01), Richman
patent: 4940988 (1990-07-01), Taylor, Jr.
patent: 5311188 (1994-05-01), Meijer et al.
patent: 5323162 (1994-06-01), Fujisaka et al.
patent: 5342349 (1994-08-01), Mims
R. Keith Raney, Synthetic Aperture Imaging Radar and Moving Targets, vol. AES.7, No. 3, pp. 499-505, May 1971.
Kazuo Ouchi, On the Multilook Images of Moving Targets by Synthetic Aperture Radars, vol. AP-33, No. 8, pp. 823-827, Aug. 1995.
Barbarossa et al, Space-Time-Frequency Processing of Synthetic Aperture Radar Signals, vol. 30, No. 2, pp. 341-358, Apr. 1994.
Keydel Wolfgang
Moreira Joao
Deutsche Forschungsanstalt fur Luft - und Raumfahrt e.V.
Sotomayor John B.
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