Method of detecting moving objects and estimating their velocity and position in SAR images
First Claim
1. A method for detecting moving objects and estimating their velocity and position in SAR images, comprising:
- generating a sequence of single-look SAR images which are of the same polarization, are successive with respect to time, and have a look center frequency which varies from one image to the next;
detecting candidates for moving objects in said single-look SAR images by searching for regions with a course of intensity which deviates from a surrounding environment;
estimating velocity of detected candidates by estimation of at least one displacement vector of one candidate respectively, utilizing a correlation between successive single-look SAR images; and
verifying detected candidates as moving objects;
wherein estimation of at least one velocity component of a detected candidates takes place jointly with an estimation of at least one position component of the candidate;
a cost function is established as a function of the components to be estimated, taking into account positions of the candidate in the individual single-look SAR images of the sequence; and
the cost function is minimized by means of an optimization method for the parameter or parameters to be estimated.
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Abstract
A method of detecting moving objects and of estimating their velocity and position in SAR images includes the steps of generating a sequence of single-look SAR images which have the same polarization, are successive in time, and have a look center frequency which varies from one image to the next; detecting candidates for moving objects in the single-look SAR images of the sequence by searching for regions with a course of intensity that deviates from the environment; estimating the velocity of the detected candidates; and verifying the detected candidates as moving objects. The estimation of one or more velocity components of a detected candidates takes place jointly with the estimation of one or more position components of the candidate. A cost function is established as a function of the components to be estimated, taking into account the positions of the candidate in the individual single-look SAR images of the sequence, which cost function is minimized by means of an optimization method for the parameter or parameters to be estimated.
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Citations
8 Claims
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1. A method for detecting moving objects and estimating their velocity and position in SAR images, comprising:
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generating a sequence of single-look SAR images which are of the same polarization, are successive with respect to time, and have a look center frequency which varies from one image to the next;
detecting candidates for moving objects in said single-look SAR images by searching for regions with a course of intensity which deviates from a surrounding environment;
estimating velocity of detected candidates by estimation of at least one displacement vector of one candidate respectively, utilizing a correlation between successive single-look SAR images; and
verifying detected candidates as moving objects;
whereinestimation of at least one velocity component of a detected candidates takes place jointly with an estimation of at least one position component of the candidate;
a cost function is established as a function of the components to be estimated, taking into account positions of the candidate in the individual single-look SAR images of the sequence; and
the cost function is minimized by means of an optimization method for the parameter or parameters to be estimated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification