| 摘要 |
For the detecting of moving vehicles by means of airplane- or space-based synthetic aperture radar systems (SAR), a known traffic route of a map, which is given by geographic coordinates and altitudes, is first converted into azimuth/range coordinates of the SAR radar image. The hypothetical radial speed (v r) of each image point of vehicles of potential relevance is determined from the distance to a traffic route in the azimuth direction, an d the appertaining vehicle image position is determined by azimuth projection onto the respective traffic route. From this hypothetical vehicle radial speed, a first focusing parameter .DELTA.fDC is derived in dependence on the radar parameters. From the hypothetical vehicle radial speed, the angle of incidence of the radar beam onto the surface of the earth and the angle between the respective traffic route and the flight path of the radar sensor , the hypothetical vehicle azimuth speed (v a) is derived and, therefrom, by inclusion of the flight path of the radar sensor and the radar parameters, a second focusing parameter .DELTA.FM is derived. The two focusing parameters .DELTA.fDC and .DELTA.FM are used for exact adjustment of the SAR focusing t o the moving object.
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