Low probability of intercept

Low probability of intercept (LPI) refers to the ability of a communication or radar system to prevent an eavesdropper from detecting or determining the modulation, modulated data, or origin of the signal. This is achieved through the use of techniques such as pulse compression signals, interference suppression, waveform design, error corrector codes, data compression, adaptive Doppler compression, and higher-order signal constellations. LPI is particularly important in the face of increasingly powerful electronic warfare equipment.From: Distributed Sensor Networks [2019], Fast detection and parameter estimation for polyphase-code radar signal [2018], Technology and Applications of Autonomous Underwater Vehicles [2019]

Conventional and Emerging Waveforms for Detection and Imaging of Targets behind Walls*

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Published in Moeness G. Amin, Through-the-Wall Radar Imaging, 2017

Fauzia Ahmad, Ram M. Narayanan

Pure noise and noise-like waveforms, such as pseudonoise or pseudorandom waveforms, have also been used recently in through-the-wall applications. Their main advantages are their low probability of detection, low probability of intercept (LPI), and antijamming capability. These result from their featureless characteristics, as can be seen from Figure 5.4. Noise waveforms are also continuous waveforms, and have a thumbtack ambiguity function. It is noted that the thumbtack ambiguity function assumption is valid only for the ideal case. In practice, any deviation from the purely theoretical case (nonlinearities, correlations, etc.) will result in a broadening of the ambiguity function and the appearance of sidelobes.

Fast detection and parameter estimation for polyphase-code radar signal

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Published in International Journal of Electronics, 2018

Xiaofeng Wang, Runlan Tian, Rui Zhou, Chunyu Wang

Electronic warfare includes the interception and analysis for the received signal (Pace, 2003), which refers to the detection for radar signal and the estimation for its modulation parameters (Li, Ji, & Jiang, 2011). In the face of the increasingly powerful electronic warfare equipment, more and more radar systems have adopted the pulse compression signals which have a low probability of intercept (LPI) (Govoni, Li, & Kosinski, 2013; Monakov & Nesterov, 2017; Shi, Wang, Sellathurai, & Zhou, 2017; Shi, Zhou, & Wang, 2017; Yang & Chen, 2017).

Low probability of intercept

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Conventional and Emerging Waveforms for Detection and Imaging of Targets behind Walls*

Fast detection and parameter estimation for polyphase-code radar signal