Results 241 to 250 of about 320,440 (285)
Some of the next articles are maybe not open access.
Low probability of intercept R-Conjugate CDMA codes
IEEE Southeastcon 2009, 2009Privacy and security have become increasingly important in code division multiple access (CDMA) systems, for both cellular and military applications. One way to improve security is to use spreading code diversity to transmit user information, a technique known as multi-code CDMA. In this paper, we present a new method of generating codes for multi-code
openaire +1 more source
Low Probability of Intercept Performance Bounds for Spread-Spectrum Systems
IEEE Journal on Selected Areas in Communications, 1985An 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
E. Chandler, G. Cooper
openaire +1 more source
Low Probability of Intercept (LPI)
1998Low 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.
openaire +1 more source
Low-probability of intercept of ultra-low-power, near-field signals
2007 IEEE Antennas and Propagation Society International Symposium, 2007Long considered a technical backwater, low-power, near-field systems are emerging as the preferred solution for a variety of useful applications. These applications include short-range communication, radio frequency identification (RFID), and real-time locating systems (RTLS).
openaire +1 more source
Soldier Identification System utilizing low probability of intercept (LPI) techniques
IEEE Aerospace and Electronic Systems Magazine, 1997This paper documents the design of a laser/radio frequency (RF) Soldier Identification (ID) System developed by Dynetics, Inc., Harris, Corp., and the US Army Communications and Electronics Command (CECOM). The Soldier ID system includes an Interrogation Unit with a programmable activation code.
M.C. Zari +5 more
openaire +1 more source
Bistatic Radar and Low-Probability-of-Intercept Radar
2004This discussion of the fundamentals of bistatic radar follows that of Willis, who provides a history of many bistatic radar proposals and programs and a summary of many technical analyses. Figure 13.1 introduces some basic terminology. Instead of two locations of interest (the radar and the target), we now have three (transmitter, Tx; receiver, Rx; and
openaire +1 more source
On sensitivity analysis of low probability of intercept (LPI) capability
MILCOM 2005 - 2005 IEEE Military Communications Conference, 2005For operational purposes, the low probability of intercept (LPI) capability of a waveform is usually quantified by the area of being intercepted by a detector. The radius of a circular area equivalent to the vulnerable area, the Circular equivalent vulnerable radius (CEVR), is used to indicate the vulnerability.
openaire +1 more source
Chirp Spread Spectrum Performance in Low Probability of Intercept Theater
MILCOM 2018 - 2018 IEEE Military Communications Conference (MILCOM), 2018The 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
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
openaire +1 more source
A feasibility study on the low probability of intercept sonar.
The Journal of the Acoustical Society of America, 2010The 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 +3 more
openaire +1 more source