Results 141 to 150 of about 75,280 (194)

A waveform with low intercept probability for OFDM SAR

2016 Progress in Electromagnetic Research Symposium (PIERS), 2016
In this paper, we propose a novel orthogonal frequency-division multiplexing (OFDM) waveform with low probability of intercept (LPI) and the corresponding synthetic aperture radar (SAR) processing algorithm. The OFDM waveform has a random spectrum for each pulse, making it a good candidate for low probability of intercept system implementation. The SAR
null Xiang Yu, null Yaowen Fu, null Lei Nie, null Guanhua Zhao, null Wenpeng Zhang   +4 more
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Optimal Detection Considerations for Low Probability of Intercept

MILCOM 1982 - IEEE Military Communications Conference - Progress in Spread Spectrum Communications, 1982
A variety of receivers which can be used to detect the presence of a wideband (spread) signal in additive white Gaussian noise (AWGN) is explored. The optimality of these receivers is founded upon the knowledge (or lack thereof) of certain key signal parameters.
A. Polydoros, C. L. Weber
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Low probability of intercept

IEEE Communications Magazine, 1983
LOW Probability of Intercept (LPI) analysis shows the effect of scenario-dependent parameters and detectability-threshold factors in jamming and nonjamming environments. The most significant improvement in LPI performance may be obtained by operating at Extremely High Frequency (EHF) and by maximizing the effective spread-spectrum processing gain and ...
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Low Probability of Intercept Performance Bounds for Spread-Spectrum Systems

IEEE Journal on Selected Areas in Communications, 1985
An important application of spread-spectrum (SS) in military communication systems is that of making the signal difficult to intercept by unauthorized receivers. Error-correction coding techniques may be employed to reduce the required input signal-to-noise ratio at the receiver, allowing the system to operate at a lower power level, hence resulting in
Edward W. Chandler, George R. Cooper
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A feasibility study on the low probability of intercept sonar.

The Journal of the Acoustical Society of America, 2010
The feasibility of low probability of intercept for sonar is explored. Using a noise-like active sonar signal, the transmitter (platform) employs a matched filter for echo detection while the target is assumed to use an energy detector. Decision statistic distributions are developed and detection performances are compared with a previous work (Gaussian
J. Daniel Park, David J. Miller, John F. Doherty, Stephen C. Thompson   +3 more
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Chirp Spread Spectrum Performance in Low Probability of Intercept Theater

MILCOM 2018 - 2018 IEEE Military Communications Conference (MILCOM), 2018
The Low Probability of Intercept (LPI) theater is a contest between an intended receiver and an intercept receiver. Both receivers need energy for detection. The challenge is to push the signal power below that of the intercept receiver noise floor while keeping it still detectable at the intended receivers.
Bijan G. Mobasseri, Khanh D. Pham
openaire   +1 more source

Array Redundancy and Diversity for Wireless Transmissions with Low Probability of Interception

2006 IEEE International Conference on Acoustics Speech and Signal Processing Proceedings, 2006
In contrast to the classical spread spectrum or data encryption methods, we propose an array redundancy-based approach for wireless transmissions with inherent low probability of interception (LPI). The redundancy of transmit antenna arrays introduces some degrees of freedom for deliberate signal randomization, based on which, diversity is exploited to
Xiaohua Li 0003, Juite Hwu, E. Paul Ratazzi   +2 more
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The low probability of intercept radar systems with spatial feedback

IEEE EUROCON 2009, 2009
“The radar system with spatial positive feedback throw the target is considered. In this system there are self-oscillations, if the system is closed through a space of the signal radio-path and the target. When the target is absent (system is not closed), transmitter output power of the noise signal is insignificant, and that complicates detection of ...
S.P. Kalenichenko, V.M. Kutuzov
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Low Probability of Intercept (LPI)

1998
Low probability of intercept (LPI) is the term used for there being a low probability that a radar's emissions will be usefully detected by an intercept receiver in another aircraft or on the ground. For the air battle of the future, LPI is essential. In conventional aircraft the most important need for LPI is to avoid electronic countermeasures.
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A multicarrier CDMA based low probability of intercept network

2010 National Conference On Communications (NCC), 2010
The need for covert communication in tactical battlefields has developed the ideas of low probability of intercept (LPI) networks. Spread spectrum communication is used for LPI communication. Multicarrier CDMA is a new type of spread spectrum technique that has been developed in recent years.
Sayan Ghosal, Devendra Jalihal, K. Giridhar   +2 more
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