Abrégé

The purpose of the present invention is to increase the possibility of finding a person carrying a terminal device after a searching area has been specified, and to reduce the time until the person carrying the terminal device is found. A GPS signal processing unit (241) measures the current location of a terminal device (2) on the basis of a GPS signal, and stores terminal location information in a memory unit (232). A BS signal processing unit (242) transmits, to a base station via a first transmission unit (214), a signal including the terminal location information stored in the memory unit (232) and information indicating a specific destination. If information requesting the transmission of identification information of the present device is input from a searching device (1), a searching signal processing unit (243) transmits, to the searching device via a second transmission unit (217), a signal including the identification information of the present device and identification information of the searching device (1) which is the communication counterpart.

Classes IPC  ?

• G01S 5/12 - Localisation par coordination de plusieurs déterminations de direction ou de ligne de positionLocalisation par coordination de plusieurs déterminations de distance utilisant les ondes radioélectriques en coordonnant des lignes de position de formes différentes, p. ex. hyperboliques, circulaires, elliptiques ou radiales
• G01S 1/68 - Marqueur, balise d'extrémité, indicatif d'appel ou toutes balises analogues transmettant des signaux ne portant pas d'information directionnelle
• G01S 13/76 - Systèmes utilisant la reradiation d'ondes radio, p. ex. du type radar secondaireSystèmes analogues dans lesquels des signaux de type pulsé sont transmis
• G01S 19/48 - Détermination de position en combinant ou en commutant entre les solutions de position dérivées du système de positionnement par satellite à radiophares et les solutions de position dérivées d'un autre système
• H04B 1/034 - Émetteurs portatifs
• H04M 1/00 - Équipement de sous-station, p. ex. pour utilisation par l'abonné
• H04M 3/42 - Systèmes fournissant des fonctions ou des services particuliers aux abonnés

Abrégé

　The purpose of the present invention is, relative to the prior art, to increase the likelihood of discovering a mountaineering accident victim or the like, and shortening the time to discovery. In standby mode, a beacon device (2), at each of first intervals, supplies electrical power to components and performs a reception process in a first period (321). A search device (1) having entered search mode repeatedly transmits call signals during a third period (312) longer than the first interval. The beacon device (2), upon receiving a call signal in the first period (321), transmits a response signal that includes identifying information about itself and the like, in a fourth period (322). Each time that a response signal is received, the search device (1) uses the response signal to estimate the distance and direction of the beacon device (2), and displays on a screen identifying information of the beacon device (2) and information pertaining to the distance and direction of the beacon device (2).

Classes IPC  ?

• G01S 5/12 - Localisation par coordination de plusieurs déterminations de direction ou de ligne de positionLocalisation par coordination de plusieurs déterminations de distance utilisant les ondes radioélectriques en coordonnant des lignes de position de formes différentes, p. ex. hyperboliques, circulaires, elliptiques ou radiales
• G01S 1/68 - Marqueur, balise d'extrémité, indicatif d'appel ou toutes balises analogues transmettant des signaux ne portant pas d'information directionnelle
• G01S 13/76 - Systèmes utilisant la reradiation d'ondes radio, p. ex. du type radar secondaireSystèmes analogues dans lesquels des signaux de type pulsé sont transmis
• H04B 1/034 - Émetteurs portatifs

Abrégé

This invention provides communication devices that can increase the possibility of finding a person in distress in mountains or the like and further can shorten the time in which the person is found, as compared with the conventional devices. A sought device (2) in a waiting state supplies a power to each of a plurality of components thereof during a first time period (321) (for example, 3 ms) at first intervals, thereby performing a reception process. A seeking device (1) having got into a search state repetitively transmits a call signal during a third time period (312) that is longer than the first interval. When having received the call signal during the first time period (321), the sought device (2) transmits a response signal, which includes identification information and the like of the sought device, during a fourth time period (322). Upon each reception of the response signal, the seeking device (1) uses the response signal to estimate the distance and direction of the sought device (2), and causes the identification information of the sought device (2) and information related to the distance and direction of the sought device (2) to be displayed on a screen.

Classes IPC  ?

• H04B 1/034 - Émetteurs portatifs
• H04W 4/02 - Services utilisant des informations de localisation
• H04W 64/00 - Localisation d'utilisateurs ou de terminaux pour la gestion du réseau, p. ex. gestion de la mobilité