A Rescue System for People Who Fall Overboard at Sea

Wada, Masaaki; Amagai, Kiyoshi; Kimura, Nobuo; Iwamori, Toshihiro

doi:10.9749/jin.108.181

Cited by 3 publications

(1 citation statement)

References 2 publications

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“…Therefore, there is some demand for a small-scale location information communications system designed for distress signaling in case of capsizing at sea or drifting [7]. Although various schemes have been proposed [8][9][10][11][12] that make use of communications satellites, GPS-enabled mobile cellular phones, or other specific small-scale wireless communications, these are not sufficiently mature for practical applications. Therefore, we have investigated the applicability of our system as a marine location information communications system.…”

Section: Introductionmentioning

confidence: 99%

DS‐SS modulated extremely weak power radio communications system synchronized by a GPS receiver PPS signal

Yoshida

Fan

Hojo

et al. 2007

Electron. Comm. Jpn. Pt. I

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SUMMARYWith developments in the technology and greater adoption of satellite positioning systems such as GPS, there has been much research into location information systems and services and their practical applications. Extremely weak power radio communications systems are small-scale and low-power devices that do not require a license and are rarely used for communications purposes because they are able to communicate only over small distances compared to other communications media; however, if the distance over which they can be used for communication could be increased, then it would be easy to construct communications systems with them. To take advantage of this we propose an extremely weak power radio communications system based on the DS-SS scheme that synchronizes chips using the pulse-per-second (PPS) signal that is output by a GPS receiver. This system is continuously able to have access to location information due to the use of the GPS receiver and we anticipate that by using this it should be possible to increase the communications distances and communications quality. In recent years there has been an increase in the number of accidents in small-scale ships with low-end communications systems have capsized while at sea or drifted. Small-scale location information systems that can be used for marine distress situations such as capsizing or drifting have become increasingly sought after and communications systems that use such extremely weak power radio communications devices for marine location information systems have been proposed. In this paper we first give an overview of our proposed marine location information system and then describe the extremely weak power radio DS-SS communications system used to implement the system. Following this we perform simple communications experiments. The results of our experiments show that a communications distance of 80 m can be improved to 800 m. From the above results we show that in addition to the marine location information system created using the proposed method, a wide range of different applications are possible.

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Section: Introductionmentioning

confidence: 99%

DS‐SS modulated extremely weak power radio communications system synchronized by a GPS receiver PPS signal

Yoshida

Fan

Hojo

et al. 2007

Electron. Comm. Jpn. Pt. I

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A Rescue System for Man-Overboard-II : By Using Low-Power Transmitter

雅昭¹,

井清²,

暢夫³

et al. 2003

The Journal of Japan Institute of Navigation

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In the previous paper ， we proposed and evaluated a worldwide usable rescue system ， which was based on the use of the mobile device combining the GPS unit and the satellite communication unit ． However ， the system was not practically applicable because the problem of the size reduction of the mobile device remained unresolved ．【 n this paper ， we proposed a new rescue system ， which was based on the use of a special low − power transmitter ． According te the statistics by Japall Coast Guard ， two thirds of man − overboard accidents occurred near by own vessels or in the inshore area ． Therefbre ， we propose a relay system fbr indirect sending ofthe SOS signal from the victim through the vessel or the onshore equipment ． Realization of the system ensures the size reduction of the mobile device ， which performs only the startup function of the relay unit ， while the GPS and the satellite communication unit are integrated into the relay unit ． The experiments have been carried out at the take area ， inshor6 area and offshore area ． As a result ， the special low − power transmitter is able to activate the relay unit in the range of 1 ， 000m ． The proposed rescue system is characterized with the high practicaI applicability due to the size reduction of the mobile device．

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Experimental Evaluation of Maritime Position Communication System Synchronized by PPS Signal of a GPS Receiver

Yoshida¹,

Hojo²,

Fan³

et al. 2006

The Journal of Japan Institute of Navigation

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Th ， au 、 h。，， p ，。 P 。、ed 跏・xt ・ em ・ly w ・ ak p ・w … adi ・ DS − SS ・・mm ・ni ・ ati・n ・ y ・t・m th・… ed th・ IPPS ・ignal of the GPS receiver for the code synchronization of the marine location information system in the emergency ． 0。，、ec 。nd d。t。 fr 。m ，， t・ig9 ・・ ed by PPS ・ign ・1・v ・ ry ・ec ・nd ， i・ c ・mpd ・ed ・ f・ p ・ead d・ta with ・ ph ・・e d・t・・ti・n ，eq 。，nce 飢血 … P ， Fi・st ， w ・ mea … ed ・ h・・e 。・ pti ・・ p ・w … BER and ・d ・tecti ・n p ・Qb ・bility wh ・n the sending P 。 i 。t was 且・・ d． W ・・bt・i ・・ d b・tt・・ BER ・ than 10 −3 at ・ 80 ・ m ・ N ・x ち w ・ m ・・… ed th・m wh ・n th・・hip has the t，、n ，mi 廿，，． Th ，，e 、。lt p ，・v ・d th・ t th・ p ・ e ・ent m ・th ・d i ・ e憮 i・・，・1th ・u 帥血・ val … w ・・e d・ 9r ・d・d ・・m 脚 ng to the case of 五xed transmitter．

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A Rescue System for People Who Fall Overboard at Sea

Cited by 3 publications

References 2 publications

DS‐SS modulated extremely weak power radio communications system synchronized by a GPS receiver PPS signal

DS‐SS modulated extremely weak power radio communications system synchronized by a GPS receiver PPS signal

A Rescue System for Man-Overboard-II : By Using Low-Power Transmitter

Experimental Evaluation of Maritime Position Communication System Synchronized by PPS Signal of a GPS Receiver

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