The Effect of Masking Interference on the Quality of Request Signal Detection in Aircraft Responders of the Identification Friend or Foe Systems

2020 ◽  
Author(s):  
Ivan Obod ◽  
Iryna Svyd ◽  
Oleksandr Maltsev ◽  
Sviatoslav Starokozhev
Keyword(s):  
Signal Detection ◽  
Masking Interference

scholarly journals Effects of Symptom Perception Interventions on Trigger Identification and Quality of Life in Children with Asthma

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Thomas Janssens ◽  
Andrew Harver
Keyword(s):  
Quality Of Life ◽  
Signal Detection ◽  
Discrimination Training ◽  
Peak Flow ◽  
Home Monitoring ◽  
Resistive Load ◽  
Symptom Perception ◽  
Children With Asthma ◽  
Asthma Triggers

Background. Management of individual triggers is suboptimal in practice. In this project, we investigated the impact of symptom perception interventions on asthma trigger identification and self-reported asthma quality of life.Methods. Children with asthma (n=227) participated in three asthma education sessions and then were randomized first to one of three home monitoring conditions (symptom monitoring and peak flow training with feedback, peak flow training without feedback, or no peak flow training) and then subsequently to one of three resistive load discrimination training conditions (signal detection training with feedback, signal detection training without feedback, or no training). Triggers were reported at enrollment, following home monitoring, and following discrimination training; quality of life was measured after home monitoring and after resistive load testing.Results. Symptom perception interventions resulted in increases in reported triggers, which increased reliably as a function of home monitoring, and increased further in participants who completed discrimination training with feedback. Increases in the number of reported asthma triggers were associated with decreases in quality of life.Discussion. Patients may benefit from strategies that make trigger-symptom contingencies clear. Complementary strategies are needed to address changes in the perceived burden of asthma which comes from awareness of new asthma triggers.

scholarly journals Optimization of data processing in aircraft transponder of the "friend or foe" identification system

Radiotekhnika ◽  
2020 ◽  
pp. 162-169
Author(s):  
I.V. Svyd ◽  
I.I. Obod ◽  
G.E. Zavolodko
Keyword(s):  
Data Processing ◽  
Signal Detection ◽  
Single Channel ◽  
Optimal Structure ◽  
Identification System ◽  
Pearson Criterion ◽  
Relative Response ◽  
Relative Bandwidth ◽  
Spatial Parameters

The paper synthesizes the optimal structure of data processing of the aircraft transponder of the “friend or foe” identification system based on the Neumann-Pearson criterion. It is also shown, that when synthesizing and analyzing the optimal structure of signal data processing in aircraft transponders of "friend or foe" identification systems, it is necessary to take into account the multichannel reception of request signals and limitations of relative throughput of the aircraft transponder, which is caused by the existing principle of constructing the system as single-channel queuing system with failures. The proposed models make it possible to implement the structures of data processing of request signals for situations of inter-channel merging of previous channel decisions on the detection of request signals or pulse components of the request signals. In the proposed structure, the optimization of data processing is carried out not only in time but also in the spatial parameters of the request signals, and also takes into account the relative bandwidth of the aircraft responder. It is shown that the inter channel merging of the results of detecting the component pulses of the query signals is more preferable compared to the existing algorithm of merging the results of detecting the query signals, as it improves the quality of query signal detection and reduces the dependence of query signal detection of relative response.

scholarly journals СРАВНИТЕЛЬНЫЙ АНАЛИЗ АЛГОРИТМОВ ОБНАРУЖЕНИЯ НЕИЗВЕСТНЫХ СИГНАЛОВ С УЧЁТОМ СОВОКУПНОСТИ ПОКАЗАТЕЛЕЙ КАЧЕСТВА

2018 ◽  
pp. 67-74
Author(s):  
Валерий Михайлович Безрук ◽  
Станислав Андреевич Иваненко
Keyword(s):  
Comparative Analysis ◽  
Signal Detection ◽  
Quality Indicators ◽  
Performance Indicators ◽  
A Priori ◽  
Pareto Optimal ◽  
Detection Algorithms ◽  
A Priori Uncertainty ◽  
Unknown Signal

The subject of this article is the problem of detecting unknown signals in conditions of high a priori uncertainty, which can occur during the determination of unoccupied frequency channels in cognitive networks. It should be noted that various sources of radio emissions work on the air, which in turn complicates the solution of the problem of detection, since it is impossible to say what kind of signal will be received. Most existing algorithms require information about the signals for their operation. In practice, it is not possible to have such data on all sources of radio emission due to their diversity. The goal of the article is to study non-classical signal detection algorithms in conditions of high a priori uncertainty, when there is information only about noise, and signals are unknown.  The task: to conduct a comparative analysis of unknown signal detection algorithms based on a set of quality indicators and to determine the set of Pareto-optimal detection algorithms, as well as to identify the best algorithm for a set of quality indicators.  The method of statistical modeling of detection algorithms on samples of real signals and noise is performed. As a result, we obtained estimates of speed of work and quality of signal detection for a number of different variants of unknown signal detection algorithms. Possible variants of implementation of the detectors were summarized in the table. These variants were formed taking into account the dimension of the DPF sample and the number of implementations on which the decision is made. A comparative analysis of different types of detection algorithms is carried out taking into account the set of performance indicators and the quality of signal detection. It should be noted that the values of quality indicators of detection of unknown signals and performance indicators of the algorithms are related and contradictory. Conclusions. A multicriteria selection of a subset of Pareto-optimal variants is performed. Using the conditional preference criterion, the only preferred variant of the algorithm for detecting unknown signals is selected from the Pareto subset. The results of the research can be used in automated radio monitoring in cognitive radio networks

How can we be so blind?: Investigating interactions among instructions, perception, and navigation

2017 ◽  
Author(s):  
Rafael Antonio Garcia ◽  
W. Jake Jacobs
Keyword(s):  
Individual Differences ◽  
Signal Detection ◽  
Sample Size ◽  
Virtual Space ◽  
Alternative Methods ◽  
Large Sample Size ◽  
Pilot Studies ◽  
As If

Prior research suggests that instructions modify place learning and navigation behaviors in a virtual space. Two pilot studies indicated that under certain instructional sets, participants behaved as if they were navigating in a room without distal cues—even though their ability to identify icons present in the room appears unaffected. In this study, we did a follow-up replicating those findings. Additionally, we attempted to measure the quality of cognitive map formation using two alternative methods (signal detection and rank ordering methods). The results of these methods were mixed; however, the large sample size, and appropriate controls used in this study solidify the interpretations of the two earlier pilot studies. Even with the vast individual differences in instruction adherence, participants given instructions that do not match the environmental contingencies (incongruent) behaved as if they were navigating in a room without distal cues.

scholarly journals To “See” Is to Feel Grateful? A Quasi-Signal Detection Analysis of Romantic Partners’ Sacrifices

2018 ◽  
Vol 10 (3) ◽  
pp. 317-325 ◽  
Author(s):  
Mariko L. Visserman ◽  
Emily A. Impett ◽  
Francesca Righetti ◽  
Amy Muise ◽  
Dacher Keltner ◽  
...  
Keyword(s):  
Signal Detection ◽  
Romantic Partners ◽  
Romantic Couples ◽  
Daily Lives ◽  
Total N ◽  
Daily Experience ◽  
Detection Analysis ◽  
Signal Detection Analysis ◽  
The Relationship

Although gratitude plays a central role in the quality of relationships, little is known about how gratitude emerges, such as in response to partners’ sacrifices. Do people need to accurately see these acts to feel grateful? In two daily experience studies of romantic couples (total N = 426), we used a quasi-signal detection paradigm to examine the prevalence and consequences of (in)accurately “seeing” and missing partners’ sacrifices. Findings consistently showed that sacrifices are equally likely to be missed as they are to be accurately detected, and about half of the time people “see” a sacrifice when the partner declares none. Importantly, “seeing” partners’ sacrifices—accurately or inaccurately—is crucial for boosting gratitude. In contrast, missed sacrifices fail to elicit gratitude, and the lack of appreciation negatively colors the partner’s satisfaction with the relationship when having sacrificed. Thus, these findings illustrate the power that perception holds in romantic couples’ daily lives.

Study on the Vibration of a Paper-Transferring Mechanism

2010 ◽  
Vol 174 ◽  
pp. 311-314
Author(s):  
Ji Fei Cai ◽  
Yuan Huang ◽  
Xin Zhu Wang
Keyword(s):  
Signal Detection ◽  
Dynamic Analysis ◽  
Signal Analysis ◽  
Structural Modification ◽  
Natural Frequencies ◽  
Vibration Signal ◽  
Noise Signal ◽  
Maximum Acceleration ◽  
The Stability

To improve the stability of a Paper-Transferring Mechanism (PTM), a profound understanding must be made on its vibration characteristics, on which based, a modified design was made. Through kinetic and dynamic analysis of the PTM, the natural frequencies were obtained based on the vibration signal detection and noise signal analysis. To reduce the vibration response of the PTM, first is to reduce its maximum acceleration and reduce the quality of moving parts and improve its quality distribution, then structural modification to the wallboards and pull beams of the platform should be made to render its inherent frequencies from its working frequencies.

TORNADO-WARNING PERFORMANCE IN THE PAST AND FUTURE: A Perspective from Signal Detection Theory

2004 ◽  
Vol 85 (6) ◽  
pp. 837-844 ◽  
Author(s):  
Harold E. Brooks
Keyword(s):  
Signal Detection ◽  
Signal Detection Theory ◽  
Warning System ◽  
The United States ◽  
Detection Theory ◽  
Probability Of Detection ◽  
Tornado Warning ◽  
The Cost ◽  
And Training

Changes over the years in tornado-warning performance in the United States can be modeled from the perspective of signal detection theory. From this view, it can be seen that there have been distinct periods of change in performance, most likely associated with deployment of radars, and changes in scientific understanding and training. The model also makes it clear that improvements in the false alarm ratio can only occur at the cost of large decreases in the probability of detection, or with large improvements in the overall quality of the warning system.

The Effect of Cueing in a Visual Signal Detection Task

1973 ◽  
Vol 25 (4) ◽  
pp. 496-503 ◽  
Author(s):  
A. H. C. Van Der Heijden ◽  
E. Eerland
Keyword(s):  
Signal Detection ◽  
Exposure Duration ◽  
Detection Task ◽  
The Other ◽  
Chance Level ◽  
Visual Signal ◽  
Small Rectangle ◽  
Signal Detection Task ◽  
Higher Sensitivity

In a signal detection task four subjects were presented with stimulus cards, 50% of which contained a capital O in one of the four quadrants. Fifty per cent of these Os were surrounded by a small rectangle. This small rectangle served as a simultaneous cue, indicating the region where the O could appear. The other 50% were surrounded by a big rectangle encompassing the whole field. Fifty per cent of the blank cards contained a small rectangle, the other 50% a big one. Exposure duration was set at 15 and 20 ms. The results indicated that subjects, for whom these exposure durations led to performance exceeding chance level, used the simultaneous cue for reducing the field to be searched, resulting in higher sensitivity (d′) in the small rectangle condition. Results were interpreted in terms of increasing efficiency of search as a result of which a higher quality of the icon was available for making decisions about the presence of the O.

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