Patent ID: 7456739
Filing Date: 2008-11-25
Classification: G01S,G08B,H01Q

Abstract:
1. An approach detecting system comprising: electric wave transmit/receive means having a cable-shaped electric wave transmitting means having radiation directivity which varies with frequency, and cable-shaped electric wave receiving means disposed substantially parallel to said electric wave transmitting means, for receiving an electric wave transmitted thereto from said electric wave transmitting means; measurement means for, when said electric wave receiving means receives a plurality of electric waves in different frequency bands which are transmitted from said electric wave transmitting means and are reflected by each of one or more targets, for outputting measurement information including signal intensity and phase of the reflected electric wave in each frequency band, and propagation delay time between transmission and reception of the plurality of electric waves in different frequency bands received by said electric wave receiving means; and calculating means for grouping the measurement information by target based on the signal intensities and phases of the plurality of reflected electric waves in different frequency bands, and for calculating position of each of the one or more targets with respect to a longitudinal direction of said electric wave transmit/receive means and distance between each of the one or more targets and said electric wave transmit/receive means based on the measurement information grouped by target.