Patent ID: 6686874
Filing Date: 2004-02-03
Classification: G01S

Abstract:
A process for computing radar signals present at subapertures of an antenna of a two-channel radar system, comprising:combining two subaperture channels by means of a wave guide element to form a sum and difference channel; and using signals of the sum and difference channel to compute the radar signals at the subaperture channels; wherein, the signals of the two subaperture channels are computed from amplitude- and phase-shifted sum and difference channel signal according to the relation X1&af;(r,f)=XS&af;(r,f)-XD&af;(r,f)&CenterDot;exp&it;â€ƒ&it;(-j&it;â€ƒ&it;Î¦0)2(1)X2&af;(r,f)=a0&CenterDot;(XS&af;(r,f)+xD&af;(r,f)&CenterDot;exp(-j&it;â€ƒ&it;Î¦02)(2)X1(r,f), X2(r,f) are frequency spectra of the two subaperture channels; XS(r,f),XD(r,f) are frequency spectra of the sum and difference channel; r is the distance cell; f is the Doppler frequency; &PHgr;0 is the phase correction factor; and a0 is the amplitude correction factor.