METHOD OF DETERMINING COORDINATES OF NONLINEAR SCATTERER USING COMBINATION RADAR Russian patent published in 2025 - IPC G01S13/46 F41H11/136 G01S13/75 G01S13/88 

FIELD: radar ranging.

SUBSTANCE: invention relates to nonlinear radar using a signal scattered by a nonlinear scatterer at the frequency of one of harmonics or combination nonlinear products of a probing signal as a received useful signal. In the disclosed method, for estimating coordinates of the nonlinear scatterer, a nonlinear radar set emits two synchronous sequences of M radio pulses: from identical simple radio pulses and from identical radio pulses with duration τ and linear frequency modulation in band Δf_PS. Received, synchronously accumulated and optimally processed scattered signal at combination frequency in form of a sequence of M identical radio pulses with linear frequency modulation in band Δf_SS and duration τ. During processing, the band of the received signal expands to a value MΔf_SS, which improves accuracy of range finding in M times. In order to eliminate dependency of duration of received radio pulses on the direction of irradiation, simple radio pulses are emitted with a longer duration. Dependence on the unknown polarity of switching on nonlinear elements in the nonlinear scatterer is eliminated by measuring with phase inversion of the emitted signals. Novelty is that the emitted simple radio pulses have a duration greater than τ, and that two measurements are made with exchange of places of antennae emitting probing signals. Nonlinear scatterer location coordinate in space is defined as the intersection of ellipse – geometric locus of points for the total time of the signal that has passed through the radiating antenna – nonlinear scatterer – receiving antenna path, and parabola – the locus of points for the difference between two times of the passage of signals from two different radiating antennae to the nonlinear scatterer.

EFFECT: high accuracy of determining coordinates of a nonlinear scatterer using time methods.

1 cl, 7 dwg, 1 ex