| 摘要 |
FIELD: radar.SUBSTANCE: present invention relates to radar, particularly to short-range radar, to which belong nonlinear radar stations searching objects with radioelectronic elements. Technical result is unambiguous measurement of azimuth in wideband nonlinear radar, as well as high azimuth resolution. Said results are achieved due to that in method of measuring angular coordinates in nonlinear radar, including measurement of azimuth coordinates using an interferometric method by comparison of signals reflected from object received simultaneously in two matching phase beam patterns, to determine azimuthal coordinates of search object, two independent transmitting antennae S1 and S2 are used, said antennae being dipoles radiating orthogonal signals at a distance a=2λ from each other, and two independent receiving antennae 1 and 2 located at distance b=λ. Between each pair of receiving and transmitting dipoles a virtual receiving channel (K1, K2, K3, K4) is formed, signal delay in each of which corresponds to delay in a single transceiving dipole arranged in middle of base between real dipoles. When observing said distances between receiving and transmitting dipoles distance between virtual dipoles is λ/2. Second harmonic signal is transmitted to dipoles, where spectrum of said signal is twice wider than spectrum of first harmonic signal, and central frequency. To ensure unambiguous measurement of azimuth direction of target distance between receiving dipoles must be twice less than distance between transmitting dipoles. Between each pair of adjacent channels phase difference is measured Δφ, as a result average value of phase difference Δφis calculated and angular direction towards target is determined by formula:where k = 2π/λ is wave number, d is distance between phase centres of virtual antennae.EFFECT: such an arrangement of elementary dipoles provides formation of a virtual aperture in non-linear radar.1 cl, 4 dwg |
