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Low probability of interception (LPI) is an important characteristic, especially for military radars. Manufacturers boast of the LPI performance of their radar but in the absence of a quantifiable metric, there is no method to compare the LPI characteristics of different radars. This paper proposes a novel method of defining metrics for the probability of interception (PI) of conventional, frequency hopping and Spread Spectrum radars. The PI of conventional radar depends on Azimuth beam width, pulse repetition frequency (PRF) and pulse width. The PI of frequency hopping radar is defined in terms of the bandwidth of transmission in each hop and the band of operation. The PI of spread spectrum radar is evaluated by comparing power spectral density (PSD) of the transmitted waveform with that of a random binary wave of similar time period.

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