DETECTION AND RANGING APPARTUS AND DETECTION AND RANGING METHOD
First Claim
1. A detection and ranging apparatus comprising:
- M spreaders for generating M spread transmitter waves by spreading a transmitter wave using mutually orthogonal M orthogonal codes, where M is an integer not smaller than 2;
M transmitting sensor elements for transmitting out said M spread transmitter waves;
N receiving sensor elements, where N is an integer not smaller than 2;
a receiving control part for splitting each of N received signals obtained at said N receiving sensor elements into M parts, and for generating M×
N despread outputs by despreading the M parts using said M orthogonal codes; and
a direction-of-arrival estimating part for estimating, based on said M×
N despread outputs, directions of arrival of reflected signals arriving from a plurality of targets.
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Accused Products
Abstract
In a detection and ranging apparatus that performs direction-of-arrival estimation using a sensor array and that enlarges an effective aperture using a plurality of transmitting sensors, adverse effects associated with time division switching are eliminated, achieving high-accuracy measurement. A transmitter wave is spread in modulators by using mutually orthogonal codes, and the resulting transmitter waves are radiated from two transmitting sensors. Signals received by receiving sensors are each split by a splitter into two parts, which are then respectively despread in a demodulator by using the same codes as those used in the transmitter.
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Citations
9 Claims
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1. A detection and ranging apparatus comprising:
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M spreaders for generating M spread transmitter waves by spreading a transmitter wave using mutually orthogonal M orthogonal codes, where M is an integer not smaller than 2; M transmitting sensor elements for transmitting out said M spread transmitter waves; N receiving sensor elements, where N is an integer not smaller than 2; a receiving control part for splitting each of N received signals obtained at said N receiving sensor elements into M parts, and for generating M×
N despread outputs by despreading the M parts using said M orthogonal codes; anda direction-of-arrival estimating part for estimating, based on said M×
N despread outputs, directions of arrival of reflected signals arriving from a plurality of targets. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A detection and ranging method of detecting a direction of arrival of a signal, comprising
spreading signals to be input to M transmitting sensor elements by mutually orthogonal M orthogonal codes, respectively, to transmit out simultaneously from said M transmitting sensor elements, where M is an integer not smaller than 2, and splitting each of signals output from N receiving sensor elements, where N is an integer not smaller than 2, into M parts, and despreading the M parts using said M orthogonal codes.
Specification