Velocity extraction
First Claim
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1. A method of extracting a radial velocity characteristic of a target from one or more coherent radiation pulse bursts comprising the steps of:
- (a) receiving radiation echo returns of the pulse bursts from a remote scene;
(b) processing the received echo returns into in-phase (I) and quadrature (Q) components;
(c) measuring the I and Q components at intervals to provide sampled data;
(d) modelling the sampled data by applying a predetermined function comprising a helix;
(e) modifying the predetermined function based on phase and amplitude to optimize the fit to the sampled data as a function of velocity;
(f) determining the target radial velocity in relation to the pitch of the helix, and(g) outputting the determined target radial velocity.
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Abstract
A method of extracting a radial velocity characteristic of a target from coherent pulse bursts comprising the steps of applying to data a ‘best fit’ model of the echo returns from a target in the presence of clutter to obtain a residue (error) value and minimising the error value by a predetermined method to give the best fit value for the target radial velocity. The method enables more information to be retrieved from coherent bursts than conventional methods and therefore greatly enhances performance of radiation pulse echo detection.
30 Citations
16 Claims
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1. A method of extracting a radial velocity characteristic of a target from one or more coherent radiation pulse bursts comprising the steps of:
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(a) receiving radiation echo returns of the pulse bursts from a remote scene; (b) processing the received echo returns into in-phase (I) and quadrature (Q) components; (c) measuring the I and Q components at intervals to provide sampled data; (d) modelling the sampled data by applying a predetermined function comprising a helix; (e) modifying the predetermined function based on phase and amplitude to optimize the fit to the sampled data as a function of velocity; (f) determining the target radial velocity in relation to the pitch of the helix, and (g) outputting the determined target radial velocity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification