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 result in masking targets at close range and suffer from poor Doppler tolerance. We overcome the range ambiguity, inherent 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.