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This paper examines a range finder with frequency modulation to determine the distance to an object with a non-linear scatterer based on measurement of the difference in frequency between the л-th harmonic of the object's scatter field and the corresponding harmonic of the probe signal. It is shown that the restricted absolute error in calculating the scatter of such a range finder is n times lower than a usual linear range finder. It is established that distance measurement from an object on the ground with a non-linear scatterer requires a significantty greater relative increment in the power of the probe signal than in the case of free distribution. Infor­mation is presented on the particulars of measurement with the range finder being examined of distant non-linear objects.



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