Patent ID: 7688255

Claim:
Electronic scanning radar apparatus comprising: means for producing a continuous wave; frequency modulation means for producing a transmission signal by modulating said continuous wave produced by said means for producing a continuous wave with FM modulation; a transmission antenna for outputting said transmission signal; a reception antenna which is comprised of two or more antenna components; a mixer for mixing a received signal received by each of said two or more antenna components and said transmission signal and for obtaining beat signals for two or more channels corresponding to said two or more antenna components; a switcher provided between said mixers and said two or more antenna components, for selectively connecting said two or more antenna components with said mixer; an A/D converter for sampling said beat signal obtained by said mixer with a predetermined sampling frequency and for obtaining receiving data which is comprised of N numbers of data for each channel; a data taker for taking two or more time data which is comprised of M number of data in a time direction in each channel from said receiving data which is comprised of N numbers of data in each said channel obtained by said A/D converter, said M number being smaller than said N number; a correlation matrix and inverse matrix estimator for obtaining a time series correlation matrix from said time data which is taken by said data taker and for estimating an inverse matrix of said time series correlation matrix; a phase information producing portion with CAPON weight for computing CAPON phase information out of said estimated inverse matrix of said time series correlation matrix and said taken time data; and a detector for detecting a distance, an azimuth and a relative speed of said target on the basis of said CAPON phase information which is computed by said phase information producing portion.