scholarly journals Superimposed training low probability of detection underwater communications

2020 ◽  
Vol 148 (3) ◽  
pp. EL273-EL278
Author(s):  
Fabio B. Louza ◽  
Harry A. DeFerrari
Keyword(s):  
Probability Of Detection ◽  
Underwater Communications ◽  
Superimposed Training ◽  
Low Probability

scholarly journals Analysis of Low Probability of Detection Capability for Chaotic Standard Map-Based FH-OFDMA System

2021 ◽  
Vol 11 (5) ◽  
pp. 2198
Author(s):  
Junwoo Jung ◽  
Jaesung Lim ◽  
Sungyeol Park ◽  
Haengik Kang ◽  
Seungbok Kwon
Keyword(s):  
Detection Probability ◽  
Probability Of Detection ◽  
Lower Probability ◽  
Symbol Sequence ◽  
Ofdma System ◽  
Standard Map ◽  
Detection Probabilities ◽  
Low Probability ◽  
Transmitted Symbol ◽  
Basic Symbol

A frequency hopping orthogonal frequency division multiple access (FH-OFDMA) can provide low probability of detection (LPD) and anti-jamming capabilities to users against adversary detectors. To obtain an extreme LPD capability that cannot be provided by the basic symbol-by-symbol (SBS)-based FH pattern, we proposed two FH patterns, namely chaotic standard map (CSM) and cat map for FH-OFDMA systems. In our previous work, through analysis of complexity to regenerate the transmitted symbol sequence, at the point of adversary detectors, we found that the CSM had a lower probability of intercept than the cat map and SBS. It is possible when a detector already knows symbol and frame structures, and the detector has been synchronized to the FH-OFDMA system. Unlike the previous work, here, we analyze whether the CSM provides greater LPD capability than the cat map and SBS by detection probability using spectrum sensing technique. We analyze the detection probability of the CSM and provide detection probabilities of the cat map and SBS compared to the CSM. Based on our analysis of the detection probability and numerical results, it is evident that the CSM provides greater LPD capability than both the cat map and SBS-based FH-OFDMA systems.

scholarly journals Low Probability of Detection Communication: Opportunities and Challenges

2019 ◽  
Vol 26 (5) ◽  
pp. 19-25 ◽  
Author(s):  
Shihao Yan ◽  
Xiangyun Zhou ◽  
Jinsong Hu ◽  
Stephen V. Hanly
Keyword(s):  
Probability Of Detection ◽  
Low Probability

Very low probability of detection of TiH2 molecule in a cosmic object

New Astronomy ◽  
2016 ◽  
Vol 48 ◽  
pp. 1-4 ◽  
Author(s):  
M.K. Sharma ◽  
M. Sharma ◽  
S. Chandra
Keyword(s):  
Probability Of Detection ◽  
Low Probability ◽  
Cosmic Object

scholarly journals Factors affecting the response of Seychelles Scops-owl Otus insularis to playback of conspecific calls: consequences for monitoring and management

2002 ◽  
Vol 12 (4) ◽  
pp. 353-364 ◽  
Author(s):  
David Currie ◽  
James Millett ◽  
Mike Hill ◽  
Nirmal Jivan Shah
Keyword(s):  
Fixed Points ◽  
Response Times ◽  
Probability Of Detection ◽  
Territory Size ◽  
Detection Rates ◽  
Factors Affecting ◽  
Significant Seasonal Variation ◽  
Repeated Use ◽  
Low Probability ◽  
Current Monitoring

The endemic Seychelles Scops-owl Otus insularis is a Critically Endangered restricted range species currently only recorded in the upland forest of Mahé, the largest (152 km2) and highest (903 m) island in the granitic Seychelles. We studied the response of colour-ringed individuals to playback of conspecific calls, to determine factors affecting playback reaction, to monitor behaviour and to assess the reliability of current monitoring techniques. Playback of the territorial waugh call was conducted at fixed points (c. 200 m apart) every month along a total transect length of 8.4 km between April 1999 and May 2001. On the basis of responses and movements of marked individuals we identified 12 territories and noted their boundaries. Mean territory length was 2.92 points (approximately 400 m), equivalent to a conservative estimated territory size of c. 12–16 ha. Males were more frequently detected than females/pairs. The probability of detection (males vs. females/pairs) was 0.87 vs. 0.50 on territory; 0.65 vs. 0.26 at fixed points within territories; and 0.58 vs. 0.22 at fixed points along the transect. There was some significant seasonal variation in detection rates at fixed points within territories for both males and pairs, and in general there was a low probability of detecting individuals around June-August and a high probability of detection around April and, to a lesser degree, October. Response times and owl-recorder distances were not influenced by moon phase or time of playback. This study provides the first baseline data on individual responses to the systematic repeated use of playback in Seychelles Scops-owl. We discuss the implications for current monitoring and its application to other similar Otus species.

scholarly journals COMPETITION POLICY EVALUATION THROUGH DAMAGE ESTIMATION IN FUEL RETAIL CARTEL IN LONDRINA, BRAZIL

2019 ◽  
Vol 23 (2) ◽  
Author(s):  
Simone Maciel Cuiabano
Keyword(s):  
Policy Evaluation ◽  
Competition Policy ◽  
Supply And Demand ◽  
Probability Of Detection ◽  
Competition Authority ◽  
Damage Estimation ◽  
Deterrence Effect ◽  
Low Probability ◽  
South Of Brazil ◽  
The City

ABSTRACT This paper estimates the fuel retailer cartel damages in the city of Londrina, Parana, part south of Brazil, using reduced and structural forms for supply and demand. Brazilian Competition Authority (CADE) documents help to characterize the ethanol and gasoline retailers involved in the collusion. The objective is to evaluate competition policy by comparing the amount of estimated damages with the amount of applied fines. This paper also adds an important result to gasoline substitution, as data shows ethanol is perceived as a perfect substitute and its price is inelastic. Results show an overcharge of 3.6% to 6.6% in the gasoline market and up to 12% in the ethanol market during collusion. Fines should consider the deterrence effect and, giving the low probability of detection, CADE’s applied fines seemed to be in line with this objective.

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