Method for distance measurement in a pulse radar with a high pulse repetition frequency

摘要

In a frequency-agile pulse Doppler radar with a high pulse repetition frequency (HPRF) in an unambiguous velocity range, the complex time signal given by the echo signals of a coherent processing interval (CPI) is transformed into the frequency domain for measuring the target range, the transformed spectrum is multiplied by a bandpass function, the centre frequency of which is at the Doppler frequency of the target, and the product is transformed back into a time signal. The amount signal of this retransformed time signal shows a distinct rising edge, from the variation of which the echo delay and thus the target range can be estimated. Particular advantages are obtained for a pulse Doppler radar comprising several frequency-agile transmitters/receivers which are simultaneously operated at different frequencies and the frequency switching times of which are staggered in time. …IMAGE…