INTER-PULSE CODING FOR IDEAL RANGE RESPONSE

A different way to increase the energy within a coherent processing interval (CPI) is suggested – many short dense pulses with inter-pulse coding instead of few widely-spaced long pulses with intra-pulse coding. Long coded pulses re-sult in masking targets at close range and suffer from poor Doppler tolerance. We overcome the range ambiguity, in-herent to dense pulses (high PRF), by inter-pulse coding. Ideal range response (no ambiguity, no sidelobes) can be obtained, e.g., by using a binary periodic Ipatov sequence for inter-pulse coding. The periodic property is maintained as long as the number of transmitted periods exceeds the number of processed periods by at least two. 1