Results 231 to 240 of about 320,440 (285)

Low Probability of Intercept Waveform Optimization Method for Sar Imaging

2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS, 2021
The survivability and stability of synthetic aperture radar (SAR) in the increasingly severe electromagnetic environment are widely concerned. With the development of interception receiver technology, it is very difficult to prevent the competitor from detecting the radio frequency (RF) energy of radar.
Mingyue Lou, Taineng Zhong, Min Li, Xinzhou Li, Zhongyu Li, Junjie Wu, Jianyu Yang   +6 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 property of binary sidel'nikov sequences

2015 International Conference on Information and Communication Technology Convergence (ICTC), 2015
In this paper, we consider the low probability of intercept (LPI) property of the binary Sidel'nikov sequences. We derive the LPI property of the sequences by deriving the triple autocorrelation bound of the binary Sidel'nikov sequences. The derived bound is approximately twice of square root of the period of the sequences, which is similar to that of ...
Ji-Woong Jang, Young-Sik Kim
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Detection of multiple access low-probability-of-intercept networks

Proceedings of TCC'94 - Tactical Communications Conference, 2002
Increased demands for highly connective, yet covert, communications in the tactical battlefield have fueled the development of so-called multiple access low-probability-of-intercept (MALPI) networks. Although there have been a number of research efforts regarding the design of MALPI networks, detectability analyses are typically carried out for a ...
R.F. Mills, G.E. Prescott
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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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Blind parameter estimation of low probability of intercept waveforms

Proceedings 7th International Conference on Signal Processing, 2004. Proceedings. ICSP '04. 2004., 2005
A novel algorithm to estimate the parameter of low probability of intercept waveforms is presented, based on RAT, de-chirp and FRFT. Except for carrier frequency and chirp rate of triangular linear frequency modulation continue waveform (TLFMCW), modulation bandwidth and modulation period are also given.
null Yuan Weiming, null Wu Shunjun
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Low Probability of Intercept Antenna Array Beamforming

IEEE Transactions on Antennas and Propagation, 2010
A novel transmit array beamforming approach is introduced that offers low probability of intercept (LPI) for surveillance radar systems employing phased array antennas. Radar systems are often highly visible to intercept receivers due to the inherent two-way versus one-way propagation loss.
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Optimalwaveform design for MIMO radarwith low probability of interception

2011 17th International Conference on Digital Signal Processing (DSP), 2011
In this paper, we consider the waveform design problem of multiple input multiple output (MIMO) radar in the presence of an interceptor. By the joint considerations of high estimation accuracy and low probability of interception, we formulate the problem as maximizing the mutual information with a constraint on the Kullback-Liebler (KL) divergence ...
null Songbai Wang, null Jian Wang, null Jianshu Chen, null Xiuming Shan   +3 more
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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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Detection of low probability of intercept signals in low SNR using multichannel sensor arrays

2014 22nd Signal Processing and Communications Applications Conference (SIU), 2014
In this paper, a method is proposed for the detection of low probability of intercept, LPI signals in high noise without prior knowledge and assumption using spatially distributed multichannel wideband sensor array. The proposed detection method uses eigenvalue ratios (EVR) of wideband spatial covariance matrix as test statistic.
Uysal, Can, Filik, Tansu
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