radar doppler frequency wave type process in short pulse high frequency carrier wave.

摘要

1. A doppler frequency radar system, comprising means for generating a high frequency carrier wave, means for amplitude modulating said carrier wave at a relatively low frequency, means for also amplitude modulating such carrier wave to produce short impulses of relatively high pulse sequence frequency, means for radiating said modulated carrier wave toward a moving object, means for receiving such wave as reflected from such a moving object, means for generating accurate timing pulses, means forming a plurality of distance measuring branch circuits, means operatively connected to said timing pulse generating means, and controlled by such pulses, for operatively connecting the receiving means to the respective branch circuits, operative to distribute said received impulses in accordance with the time relation of the received impulses to the timing pulses, means in each branch circuit for demodulating the pulses appearing therein and to form rough distance measuring pulses, means in each branch circuit forming a coincidence circuit and operatively connected to said timing pulse generating means whereby said coincidence circuit is operable to form, responsive to coincident occurrence of the respective rough distance measuring pulses and the timing pulses, fine measuring pulses which assure unequivocal distance indication even in the presence of high pulse sequence frequency.