Detection and Ranging Device and Detection and Ranging Method
First Claim
1. A detection and ranging device with a transmission sensor array and a reception sensor array that is formed of n (2≦
- n) sensor elements, estimating a target count indicating the number of targets based on reflected signals of transmission signals sent from the transmission sensor array and reflected from the targets, and estimating an angle at which each reflected signal comes based on the target count, the detection and ranging device comprising;
a correlation-vector generating unit that generates correlation vectors based on outputs of the n sensor elements of the reception sensor array;
a pseudo-spatial-average-covariance-matrix calculating unit that calculates a pseudo-forward-spatial-average-covariance matrix based on the correlation vectors generated by the correlation-vector generating unit;
a target-count-estimation-matrix generating unit that generates a target-count-estimation matrix based on the pseudo-forward-spatial-average-covariance matrix calculated by the pseudo-spatial-average-covariance-matrix calculating unit; and
a target-count estimating unit that estimates the target count based on an index defined by using diagonal elements of a diagonal matrix or elements of an upper triangular matrix, as a result of matrix decomposition performed on the target-count-estimation matrix generated by the target-count-estimation-matrix generating unit.
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Abstract
A pseudo-spatial-average-covariance-matrix generating unit selects, from matrixes Rf1, Rf2, Rb1 and Rb2, one appropriate matrix or two or more appropriate matrixes for combination to generate a pseudo-spatial-average-covariance matrix R. A pseudo-spatial-average-covariance-matrix Hermitian-conjugate product generating unit generates a target-count-estimation matrix RRH. A target-count-estimation-matrix decomposing unit performs LU decomposition on RRH into a lower triangular matrix L and an upper triangular matrix U. An index generating unit generates an index using elements of the upper triangular matrix U. An index-parameter scanning unit estimates a target count by using the index generated by the index generating unit.
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Citations
13 Claims
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1. A detection and ranging device with a transmission sensor array and a reception sensor array that is formed of n (2≦
- n) sensor elements, estimating a target count indicating the number of targets based on reflected signals of transmission signals sent from the transmission sensor array and reflected from the targets, and estimating an angle at which each reflected signal comes based on the target count, the detection and ranging device comprising;
a correlation-vector generating unit that generates correlation vectors based on outputs of the n sensor elements of the reception sensor array; a pseudo-spatial-average-covariance-matrix calculating unit that calculates a pseudo-forward-spatial-average-covariance matrix based on the correlation vectors generated by the correlation-vector generating unit; a target-count-estimation-matrix generating unit that generates a target-count-estimation matrix based on the pseudo-forward-spatial-average-covariance matrix calculated by the pseudo-spatial-average-covariance-matrix calculating unit; and a target-count estimating unit that estimates the target count based on an index defined by using diagonal elements of a diagonal matrix or elements of an upper triangular matrix, as a result of matrix decomposition performed on the target-count-estimation matrix generated by the target-count-estimation-matrix generating unit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- n) sensor elements, estimating a target count indicating the number of targets based on reflected signals of transmission signals sent from the transmission sensor array and reflected from the targets, and estimating an angle at which each reflected signal comes based on the target count, the detection and ranging device comprising;
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8. A detection and ranging method for a detection and ranging device with a transmission sensor array and a reception sensor array that is formed of n (2≦
- n) sensor elements, estimating a target count indicating the number of targets based on reflected signals of transmission signals sent from the transmission sensor array and reflected from the targets, and estimating an angle at which each reflected signal comes based on the target count, the detection and ranging method comprising;
generating correlation vectors based on outputs of the n sensor elements of the reception sensor array; calculating a pseudo-forward-spatial-average-covariance matrix based on the generated correlation vectors; calculating a pseudo-backward-spatial-average-covariance matrix based on the calculated pseudo-forward-spatial-average-covariance matrix; generating, as a target-count-estimation matrix, a product of an output matrix and a Hermitian conjugate of the output matrix, the output matrix being generated by selecting one appropriate matrix or two or more appropriate matrixes for combination from among the calculated pseudo-forward-spatial-average-covariance matrixes and the calculated pseudo-backward-spatial-average-covariance matrixes; and estimating the target count based on an index defined by using diagonal elements of a diagonal matrix or elements of an upper triangular matrix, as a result of matrix decomposition performed on the generated target-count-estimation matrix. - View Dependent Claims (9, 10, 11, 12, 13)
- n) sensor elements, estimating a target count indicating the number of targets based on reflected signals of transmission signals sent from the transmission sensor array and reflected from the targets, and estimating an angle at which each reflected signal comes based on the target count, the detection and ranging method comprising;
Specification