SAR RADAR SYSTEM
First Claim
1. A method for detecting targets comprising moving and stationary targets with a radar system equipped with synthetic aperture radar onboard a synthetic aperture radar platform, comprising navigation equipment for accurate determination of the position of the synthetic aperture radar platform, and which is transversing a stationary ground region and targets in the said ground region, in which the synthetic aperture radar platform obtains radar data utilizing at least one antenna, the movement of the synthetic aperture radar platform during recording of the data being essentially rectilinear and uniform in an azimuth direction, and a velocity of the synthetic aperture radar platform being significantly larger than those of the moving targets, the radar system further comprising a synthetic aperture radar processor recording the radar data and the position of the at least one antenna for each transmitted radar pulse, and wherein within synthetic sub-apertures, each sub-aperture covering a surveyed region being a part of the stationary ground region, radar data are:
- successively merged in N iteration steps into synthetic aperture radar images of increasing resolution of the surveyed region, and whereineach iteration step consists of forming a new synthetic aperture radar image at a new iteration level by a linear combination of neighbouring successively merged synthetic aperture radar imageswhere the linear combination being obtained by a relation such that related coordinates indicates the same target position at a given reference time for all targets having a specific relative velocity with respect to the moving synthetic aperture radar platform and a specific degree of acceleration in the direction orthogonal to the movement of the synthetic aperture radar platform.
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Abstract
A method for detecting targets including moving and stationary targets with a radar system equipped with Synthetic Aperture Radar (SAR) onboard a SAR platform including navigation equipment for accurate determination of the position of the SAR platform. The SAR platform is transversing a stationary ground region and targets in the ground region, in which the SAR platform obtains radar data utilizing at least one antenna. A SAR processor records the radar data and the position of the antenna or antennas for each transmitted radar pulse. Radar data within synthetic sub-apertures, are successively merged in N iteration steps into SAR images of increasing resolution of the surveyed region and wherein each iteration step includes forming a new SAR image at a new iteration level by a linear combination of neighboring SAR images in the previous iteration step. A radar system and a SAR processor used for calculating the detection and positioning of targets including moving and stationary targets.
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Citations
24 Claims
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1. A method for detecting targets comprising moving and stationary targets with a radar system equipped with synthetic aperture radar onboard a synthetic aperture radar platform, comprising navigation equipment for accurate determination of the position of the synthetic aperture radar platform, and which is transversing a stationary ground region and targets in the said ground region, in which the synthetic aperture radar platform obtains radar data utilizing at least one antenna, the movement of the synthetic aperture radar platform during recording of the data being essentially rectilinear and uniform in an azimuth direction, and a velocity of the synthetic aperture radar platform being significantly larger than those of the moving targets, the radar system further comprising a synthetic aperture radar processor recording the radar data and the position of the at least one antenna for each transmitted radar pulse, and wherein within synthetic sub-apertures, each sub-aperture covering a surveyed region being a part of the stationary ground region, radar data are:
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successively merged in N iteration steps into synthetic aperture radar images of increasing resolution of the surveyed region, and wherein each iteration step consists of forming a new synthetic aperture radar image at a new iteration level by a linear combination of neighbouring successively merged synthetic aperture radar images where the linear combination being obtained by a relation such that related coordinates indicates the same target position at a given reference time for all targets having a specific relative velocity with respect to the moving synthetic aperture radar platform and a specific degree of acceleration in the direction orthogonal to the movement of the synthetic aperture radar platform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 24)
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17. A radar system equipped with synthetic aperture radar onboard a synthetic aperture radar platform, comprising navigation equipment for accurate determination of the position of the synthetic aperture radar platform, the radar system being arranged for detecting targets comprising moving or stationary targets and for transversing a stationary ground region and targets in the said ground region, in which the synthetic aperture radar platform is arranged to obtain radar data utilizing at least one antenna, the synthetic aperture radar platform being arranged to move essentially rectilinear and uniform in an azimuth direction with a velocity significantly larger than those of the moving targets during recording of the data, the radar system further comprising a synthetic aperture radar processor arranged to record the radar data and the position of the antenna or antennas for each transmitted radar pulse, and wherein within synthetic sub-apertures, each sub-aperture arranged to cover a surveyed region being a part of the stationary ground region, radar data are:
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successively arranged to be merged in N iteration steps into synthetic aperture radar images of increasing resolution of the surveyed region and where each iteration step consisting of arrangement for forming a new synthetic aperture radar image at a new iteration level by a linear combination of neighbouring synthetic aperture radar images in the previous iteration step and where the linear combination is arranged to be obtained by a relation such that related coordinates are arranged to indicate the same target position at a given reference time for all targets having a specific relative velocity with respect to the moving synthetic aperture radar platform and a specific degree of acceleration in the direction orthogonal to the movement of the synthetic aperture radar platform. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification