Abstract:Pulse repetition interval (PRI) or pulse repetition frequency (PRF) is one of the most robust parameters of radars, reflecting the temporal pattern of radar pulses.In terms of functionality, PRI not only determines the distance of radar single value ranging, but also affects the size of the non-ambiguous area of speed measurement. Modern radar often uses multiple PRI values and multiple PRI modulation types to meet the requirements of different functions. In the field of non-cooperative electronic reconnaissance, PRI refers to the interval between the rising edges of two consecutive pulses, which is one of important pulse description words (PDWs). PRI information includes typical PRI value sets, PRI modulation types, the PRI pattern, which need to be extracted from complex radar pulse trains before being applied to data processing tasks such as deinterleaving and recognition. This article starts from the system and technical difficulties of extracting and applying PRI information in electronic reconnaissance systems, surveys the research status of three PRI information extraction and application, and makes prospects for further development of PRI information extraction and application.
