Reflected wave power estimation device in a radar signal processor
First Claim
1. A reflected wave power estimation device for a radar signal processor, comprising:
- two or more observation means, each observation means having an array element for catching a reflected wave from a target and for outputting a predetermined observation signal from said caught reflected wave;
observation signal component extracting means for extracting an observation signal component concerning said target from said observation signals outputted from each said observation means;
sample correlation matrix computing means for computing a sample correlation matrix showing a correlation characteristic between said observation means, said sample correlation matrix being a sample value of a correlation matrix from said extracted observation signal components corresponding to said respective observation means; and
power estimating means for estimating power of a reflected wave in a predetermined arrival direction from said sample correlation matrix, an array response matrix which is computed on the basis of arrival directions of said caught reflected waves, said array response matrix being comprised of response vectors of said caught reflected waves and an observation noise power given in advance, eliminating an influence of said reflected waves on said reflected wave in said predetermined arrival direction, and for outputting the estimated power outside as a reflected power estimation value;
said power estimating means having adjacent azimuth array response matrix computing means for selecting said reflected wave in said predetermined arrival direction and a reflected wave in an azimuth adjacent to said predetermined arrival direction and for computing and determining said array response matrix as an adjacent azimuth array response matrix, said adjacent azimuth array response matrix having only said reflected wave of said predetermined arrival direction and said reflected wave in said azimuth adjacent to said predetermined arrival direction as elements;
whereby said power estimating means estimates power of said reflected wave in said predetermined arrival direction on the basis of said adjacent azimuth array response matrix computed by said adjacent azimuth array response matrix computing means.
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Abstract
A radar signal processor has observation means for outputting a predetermined observation signal from a reflected wave, means for extracting an observation signal component concerning a target from the observation signal, means for computing a sample correlation matrix showing a correlation characteristic between the observation means from the observation signal components, means for estimating power of the reflected wave from the sample correlation matrix, and an array response matrix which is comprised of response vectors of the reflected waves. When estimating the power, an adjacent azimuth array response matrix having only the reflected waves of a predetermined arrival direction which power is to be estimated and the reflected waves of an azimuth adjacent to the reflected wave as elements is determined so as to estimate the power of the reflected wave.
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Citations
6 Claims
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1. A reflected wave power estimation device for a radar signal processor, comprising:
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two or more observation means, each observation means having an array element for catching a reflected wave from a target and for outputting a predetermined observation signal from said caught reflected wave; observation signal component extracting means for extracting an observation signal component concerning said target from said observation signals outputted from each said observation means; sample correlation matrix computing means for computing a sample correlation matrix showing a correlation characteristic between said observation means, said sample correlation matrix being a sample value of a correlation matrix from said extracted observation signal components corresponding to said respective observation means; and power estimating means for estimating power of a reflected wave in a predetermined arrival direction from said sample correlation matrix, an array response matrix which is computed on the basis of arrival directions of said caught reflected waves, said array response matrix being comprised of response vectors of said caught reflected waves and an observation noise power given in advance, eliminating an influence of said reflected waves on said reflected wave in said predetermined arrival direction, and for outputting the estimated power outside as a reflected power estimation value; said power estimating means having adjacent azimuth array response matrix computing means for selecting said reflected wave in said predetermined arrival direction and a reflected wave in an azimuth adjacent to said predetermined arrival direction and for computing and determining said array response matrix as an adjacent azimuth array response matrix, said adjacent azimuth array response matrix having only said reflected wave of said predetermined arrival direction and said reflected wave in said azimuth adjacent to said predetermined arrival direction as elements; whereby said power estimating means estimates power of said reflected wave in said predetermined arrival direction on the basis of said adjacent azimuth array response matrix computed by said adjacent azimuth array response matrix computing means. - View Dependent Claims (2, 3, 4, 5)
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6. A reflected wave power estimation device for a radar signal processor comprising:
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two or more observation means, each observation means adapted to catch a reflected wave from a target and output a predetermined observation signal based on said caught reflected wave; observation signal component extracting means for extracting an observation signal component relating to said target from said observation signals; sample correlation matrix computing means for computing a sample correlation matrix based on a sample value of a correlation matrix from said extracted observation signal components; power estimating means for estimating power of a reflected wave in a predetermined arrival direction from said sample correlation matrix, an array response matrix which is computed on the basis of arrival directions of said caught reflected waves, said array response matrix comprising response vectors of said caught reflected waves and an observation noise power given in advance, eliminating influence of said reflected waves on said reflected wave in said predetermined arrival direction; said power estimating means having adjacent azimuth array response matrix computing means for selecting said reflected wave in said predetermined arrival direction and a reflected wave in an azimuth adjacent to said predetermined arrival direction and for computing said array response matrix as an adjacent azimuth array response matrix, said adjacent azimuth array response matrix having only said reflected wave of said predetermined arrival direction and said reflected wave in said azimuth adjacent to said predetermined arrival direction as elements; and whereby said power estimating means estimates power of said reflected wave in said predetermined arrival direction on the basis of said adjacent azimuth array response matrix computed by said adjacent azimuth array response matrix computing means.
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Specification