| US 7,486,230 B2 | ||
| Reflected wave power estimation device in a radar signal processor | ||
| Gaku Takano, Kanagawa-ken (Japan); Chiharu Yamano, Tokyo (Japan); Kazuma Natsume, Oobu (Japan); and Yasuyuki Miyake, Toyota (Japan) | ||
| Assigned to Denso Corporation, (Japan) | ||
| Filed on Nov. 29, 2006, as Appl. No. 11/605,993. | ||
| Claims priority of application No. 2005-345709 (JP), filed on Nov. 30, 2005. | ||
| Prior Publication US 2007/0120730 A1, May 31, 2007 | ||
| Int. Cl. G01S 7/02 (2006.01); G01S 13/93 (2006.01) | ||
| U.S. Cl. 342—189 [342/70; 342/147; 342/175; 342/195] | 6 Claims |
| 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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