scholarly journals MNM-P5-4 Wearable Line-of-sight Detection System Using MEMS

2010 ◽  
Vol 2010.2 (0) ◽  
pp. 103-104
Author(s):  
Akira Oikawa ◽  
Takayuki Muro ◽  
Norihisa Miki
Keyword(s):  
Detection System ◽  
Line Of Sight

Prediction on operating range of passive troposcatter detection system

2018 ◽  
Vol 11 (1) ◽  
pp. 22-26 ◽  
Author(s):  
Zan Liu ◽  
Xihong Chen
Keyword(s):  
Electromagnetic Wave ◽  
Analytical Study ◽  
Detection System ◽  
Rain Attenuation ◽  
Propagation Loss ◽  
Line Of Sight ◽  
Time Model ◽  
Operating Range ◽  
Statistic Model ◽  
Loss Models

AbstractElectromagnetic wave of enemy radar propagated by troposcatter is a valuable candidate for beyond line-of-sight detection. There is no analytical study considering the operating range of passive troposcatter detection system. In this paper, we study the way to predict the operating range, which is dominated by propagation loss. The key propagation loss models including statistic model and real-time model are analyzed. During deducing the latter loss model, Hopfield model is introduced to precisely describe the tropospheric refractivity. Meanwhile, rain attenuation is also taken into consideration. Several examples demonstrate the feasibility of predicting operating range through the proposed method.

scholarly journals Passive Visible Light Detection of Humans

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 1902 ◽  
Author(s):  
Kenneth Deprez ◽  
Sander Bastiaens ◽  
Luc Martens ◽  
Wout Joseph ◽  
David Plets
Keyword(s):  
Visible Light ◽  
Detection Rate ◽  
Detection System ◽  
Light Emitting Diode ◽  
Line Of Sight ◽  
Controlled Environment ◽  
Ambient Light ◽  
Light Emitting ◽  
Light Sensing ◽  
Reflected Light

This paper experimentally investigates passive human visible light sensing (VLS). A passive VLS system is tested consisting of one light emitting diode (LED) and one photodiode-based receiver, both ceiling-mounted. There is no line of sight between the LED and the receiver, so only reflected light can be considered. The influence of a human is investigated based on the received signal strength (RSS) values of the reflections of ambient light at the photodiode. Depending on the situation, this influence can reach up to ± 50 % . The experimental results show the influence of three various clothing colors, four different walking directions and four different layouts. Based on the obtained results, a human pass-by detection system is proposed and tested. The system achieves a detection rate of 100% in a controlled environment for 21 experiments. For a realistic corridor experiment, the system keeps its detection rate of 100% for 19 experiments.

3A1-R01 Extract Human Factors with Wearable Line-of-Sight Detection System(Wearable Robotics)

2014 ◽  
Vol 2014 (0) ◽  
pp. _3A1-R01_1-_3A1-R01_3
Author(s):  
Miho Ogawa ◽  
Masataka Ozawa ◽  
Kota Sampei ◽  
Carlos Cotes ◽  
Norihisa Miki
Keyword(s):  
Human Factors ◽  
Detection System ◽  
Line Of Sight ◽  
Wearable Robotics

scholarly journals Line of sight visibility analysis for foreign object debris detection system

2021 ◽  
Vol 1878 (1) ◽  
pp. 012006
Author(s):  
G Fizza ◽  
S M Idrus ◽  
F Iqbal ◽  
W H W Hassan ◽  
N Shibagaki ◽  
...  
Keyword(s):  
Detection System ◽  
Line Of Sight ◽  
Foreign Object ◽  
Visibility Analysis

2A1-G30 Wearable Line-of-Sight Detection System Using MEMS

2010 ◽  
Vol 2010 (0) ◽  
pp. _2A1-G30_1-_2A1-G30_2
Author(s):  
Akira OIKAWA ◽  
Takayuki MURO ◽  
Norihisa MIKI
Keyword(s):  
Detection System ◽  
Line Of Sight

scholarly journals Twin Doppler Rayleigh/Mie/Raman lidar for wind and temperature measurements in the middle atmosphere up to 80 km

2010 ◽  
Vol 3 (4) ◽  
pp. 2779-2803 ◽  
Author(s):  
G. Baumgarten
Keyword(s):  
Dynamic Range ◽  
Middle Atmosphere ◽  
Direct Detection ◽  
Detection System ◽  
Line Of Sight ◽  
Raman Lidar ◽  
Mean Power ◽  
Wind Measurements ◽  
Cascaded Channels ◽  
532 Nm

Abstract. A direct detection Doppler shift system for measuring wind speed in the middle atmosphere up to 80 km with 2 h resolution was implemented in the ALOMAR Rayleigh/Mie/Raman lidar (69° N, 16° E). The statistical uncertainty of the line of sight wind is about 0.6 m/s and 10 m/s at 49 km and 80 km, respectively. We use a Doppler Rayleigh Iodine Spectrometer (DoRIS) at the iodine line 1109 (~532.260 nm). DoRIS uses two branches of intensity cascaded channels to cover the dynamic range from 10 to 100 km altitude. The wind detection system was designed to extend the existing multi-color observations of aerosol and temperature. The lidar uses two lasers with a mean power of 14 W at 532 nm each and two 1.8 m diameter tiltable telescopes. Below about 49 km altitude the accuracy and time resolution is limited by the maximum count rate of the detectors used and not by the number of photons available. We report about the first simultaneous Rayleigh temperature and wind measurements by lidar in the strato- and mesosphere on 17 and 23 January 2009.

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