JP2010117241A - Sps receiving terminal - Google Patents

Sps receiving terminal Download PDF

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JP2010117241A
JP2010117241A JP2008290554A JP2008290554A JP2010117241A JP 2010117241 A JP2010117241 A JP 2010117241A JP 2008290554 A JP2008290554 A JP 2008290554A JP 2008290554 A JP2008290554 A JP 2008290554A JP 2010117241 A JP2010117241 A JP 2010117241A
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terminal
representative
receiving terminal
sps
short
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Kazuhiro Nojima
一宏 野嶋
Kei Murayama
圭 村山
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Panasonic Corp
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Panasonic Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

<P>PROBLEM TO BE SOLVED: To provide a GPS receiving terminal capable of reducing power consumption without sacrificing positioning accuracy so much, and determining to be located away (separated) even in the outside of radio communication network of a base station or the like. <P>SOLUTION: A GPS receiving terminal 100 includes: a GPS receiving part 101 for receiving a GPS signal; a position calculation part (not shown) for performing positioning calculation based on the GPS signal received by the GPS receiving part 101; a short distance wireless transmission/reception part 102 for receiving the result of the positioning calculation by a representative GPS receiving terminal in a short distance by short distance wireless communication; and a positioning calculation controlling part (a controlling part 103) which does not allow the position calculation part to perform positioning calculation when the short distance wireless transmission/reception part 102 can receive the result of the positioning calculation by the representative GPS receiving terminal in a short distance, and allows the position calculation part to perform positioning calculation when the short distance wireless transmission/reception part 102 cannot receive the result of the positioning calculation by the representative GPS receiving terminal. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、ＧＰＳ（Ｇｌｏｂａｌ Ｐｏｓｉｓｉｏｎｉｎｇ Ｓｙｓｔｅｍ）測位信号による位置情報をもとに現在位置や目的地までの経路を表示するＧＰＳ受信端末等のＳＰＳ（Ｓａｔｅｌｉｔｅ Ｐｏｓｉｓｉｏｎｉｎｇ Ｓｙｓｔｅｍ）受信端末に関し、特に、グループで移動等の際、代表となるＧＰＳ受信端末の位置情報を複数のＧＰＳ受信端末で共有する機能と、複数のＧＰＳ受信端末のうちいずれかのＧＰＳ受信端末が離別した際の合流案内を行う機能を持ったＧＰＳ受信端末に関する。   The present invention relates to an SPS (Satelite Positioning System) receiving terminal such as a GPS receiving terminal that displays a current position and a route to a destination based on position information based on a GPS (Global Positioning System) positioning signal, and in particular, moves in a group. In such cases, the function of sharing the position information of a representative GPS receiving terminal among a plurality of GPS receiving terminals and the function of performing merge guidance when any one of the plurality of GPS receiving terminals is separated The present invention relates to a GPS receiving terminal.

ＧＰＳ測位信号による位置情報をもとに現在位置を表示するＧＰＳ受信端末において、グループでの山岳歩行、トレッキング、集団での移動などでグループの位置情報を共有したり、また一部のメンバが離別してしまった場合に再び合流する（グループ復帰）のを支援する装置およびシステムについては、関連する技術が以下の文献に記載されている。   In a GPS receiver terminal that displays the current position based on position information obtained from GPS positioning signals, the group position information is shared by mountain walking, trekking, group movement, etc., and some members are separated. Regarding the apparatus and system that supports rejoining (group return) in the case of separation, related techniques are described in the following documents.

例えば、特許文献１に記載のナビゲーションシステムは、ＧＰＳ信号によって取得した位置情報を携帯電話等の移動端末を用いることにより、お互いの位置をナビゲーションシステムに表示されている地図上に表示している。   For example, the navigation system described in Patent Document 1 displays the position information acquired by the GPS signal on a map displayed on the navigation system by using a mobile terminal such as a mobile phone.

また、特許文献２に記載のカーナビゲーション装置では、ＧＰＳを利用した自動車のカーナビゲーション装置において、予めリーダーの車両を決めておき、その他の車両ではＰＨＳや携帯型電話機７による通信手段を介してリーダーの車両の位置情報を定期的に受信し、リーダーの車両の位置と自車位置との距離が一定値以上になった場合に警告メッセージを表示部１２に表示するとともに、リーダーの車両にも警告メッセージを送信、リーダー車両に追いつくルートを算出し設定している。特許文献２に記載のカーナビゲーション装置では、この構成により、遅れや、逸脱があっても、追いかけることが可能になり、また、リーダーの車両では警告メッセージが表示された場合、速度を落として待つようにすることもできる。
特開２０００−３３１２８４号公報 特開２００２−１６８６４０号公報 In the car navigation device described in Patent Document 2, in the car navigation device of a car using GPS, a leader vehicle is determined in advance, and in other vehicles, the leader is connected via a communication means such as a PHS or a portable telephone 7. The vehicle position information is periodically received, and a warning message is displayed on the display unit 12 when the distance between the position of the leader's vehicle and the vehicle's position exceeds a certain value, and the leader's vehicle is also warned. A message is sent and the route to catch up with the leader vehicle is calculated and set. In the car navigation device described in Patent Document 2, this configuration allows chasing even if there is a delay or deviation, and when a warning message is displayed on the leader's vehicle, the speed is reduced and waits. It can also be done.
JP 2000-33284 A JP 2002-168640 A

しかしながら、特許文献１、２に開示された技術では、グループ内のメンバのもつ機器（移動端末、カーナビゲーション装置）はいずれも並行して常にＧＰＳ測位を行うことでグループメンバのもつ機器の位置と自機器の位置との関係（距離等）を計測しているため、グループで移動する際には消費電力が無駄となっており、山岳歩行やトレッキングなど給電装置がない状況では、バッテリでの長時間の利用が困難である。   However, in the techniques disclosed in Patent Documents 1 and 2, the devices (mobile terminals and car navigation devices) possessed by the members in the group always perform GPS positioning in parallel to determine the positions of the devices possessed by the group members. Because it measures the relationship (distance, etc.) with the position of its own device, power consumption is wasted when moving in groups, and when there is no power supply device such as mountain walking or trekking, the battery Use of time is difficult.

また、特許文献１、２に開示された技術では、自己の位置を携帯電話等の無線による通信網を利用することで他のグループメンバに伝えているため、無線による通信網が圏外である場所では、リーダーの位置情報を受信できなくなる。したがって、山岳歩行やトレッキングなどの山間部などの通信網の圏外では利用できない。   Further, in the techniques disclosed in Patent Documents 1 and 2, the location of the wireless communication network is out of service area because the position of itself is transmitted to other group members by using a wireless communication network such as a mobile phone. Then, it becomes impossible to receive the position information of the reader. Therefore, it cannot be used outside the communication network such as mountain walks and trekking.

本発明は上記従来の課題を解決するものであり、グループでの山岳歩行やトレッキング等において経路案内や現在位置表示を行う際、代表のＳＰＳ受信端末のみがＳＰＳ測位を行い、その測位結果を近距離無線通信で共有することで、測位精度をそれほど犠牲にせずに、低消費電力化できるＳＰＳ受信端末を提供することを目的とする。また、基地局等の無線による通信網の圏外においても、離れてしまった（はぐれた）ことの判断ができ、例えば、グループのメンバの一部がグループから離別してしまった際のグループへの復帰案内等ができるＳＰＳ受信端末を提供することを目的とする。   The present invention solves the above-described conventional problems, and when performing route guidance or current position display in mountain walking or trekking in a group, only a representative SPS receiving terminal performs SPS positioning, and the positioning result is It is an object of the present invention to provide an SPS receiving terminal that can reduce power consumption without sacrificing positioning accuracy so much by sharing it by distance wireless communication. In addition, it can be determined that the mobile station has been separated (separated) even outside the area of the wireless communication network such as a base station. For example, when a part of a group member is separated from the group, the group is returned to the group. An object of the present invention is to provide an SPS receiving terminal capable of providing guidance or the like.

本発明のＳＰＳ受信端末は、複数のＳＰＳ受信端末のうちのひとつのＳＰＳ受信端末を代表のＳＰＳ受信端末と定めたＳＰＳ受信端末システムにおいて、ＳＰＳ信号を受信するＳＰＳ信号受信部と、ＳＰＳ信号受信部が受信したＳＰＳ信号に基づいて測位演算を行なう測位演算部と、近距離無線通信により、近距離にある前記代表のＳＰＳ受信端末の行なった測位演算の結果を受信する近距離無線通信部と、近距離にある前記代表のＳＰＳ受信端末の行なった測位演算の結果を受信できる場合には、前記測位演算部の測位演算を行なわせず、前記代表のＳＰＳ受信端末の行なった測位演算の結果を受信できない場合には、前記測位演算部の測位演算を行なわせる測位演算制御部と、を備えるようにした。   An SPS receiving terminal according to the present invention includes an SPS signal receiving unit that receives an SPS signal in an SPS receiving terminal system in which one SPS receiving terminal among a plurality of SPS receiving terminals is defined as a representative SPS receiving terminal, and an SPS signal receiving A positioning calculation unit that performs positioning calculation based on the SPS signal received by the unit, and a short-range wireless communication unit that receives a result of the positioning calculation performed by the representative SPS receiving terminal at a short distance by short-range wireless communication; If the result of the positioning calculation performed by the representative SPS receiving terminal at a short distance can be received, the result of the positioning calculation performed by the representative SPS receiving terminal is not performed without performing the positioning calculation of the positioning calculating unit. And a positioning calculation control unit that causes the positioning calculation unit to perform positioning calculation.

本発明のＳＰＳ受信端末は、グループでの山岳歩行やトレッキング等において経路案内や現在位置表示を行う際、代表のＳＰＳ受信端末のみがＳＰＳ測位を行い、その測位結果を近距離無線通信で共有することで、測位精度をそれほど犠牲にせずに、低消費電力化できるＳＰＳ受信端末を提供することができる。また、基地局等の無線による通信網の圏外においても、離れてしまった（はぐれた）ことの判断ができ、例えば、グループのメンバの一部がグループから離別してしまった際のグループへの復帰案内等ができるＳＰＳ受信端末を提供することができる。   When the SPS receiving terminal of the present invention performs route guidance or current position display in mountain walking or trekking in a group, only the representative SPS receiving terminal performs SPS positioning and shares the positioning result by short-range wireless communication. Thus, it is possible to provide an SPS receiving terminal capable of reducing power consumption without sacrificing positioning accuracy so much. In addition, it can be determined that the mobile station has been separated (separated) even outside the area of the wireless communication network such as a base station. For example, when a part of a group member is separated from the group, the group is returned to the group. An SPS receiving terminal capable of providing guidance or the like can be provided.

以下、本発明の実施の形態におけるＧＰＳ受信端末について、図面を参照しながら説明する。   Hereinafter, a GPS receiving terminal according to an embodiment of the present invention will be described with reference to the drawings.

（実施の形態１）
本実施の形態１は、共通のグループＩＤを登録した複数のＧＰＳ受信端末で形成するグループにおいて、共通のグループＩＤを含む呼び出し信号を送受信する近距離無線通信を行い代表となるＧＰＳ受信端末のＧＰＳ測位によって取得した位置情報を共有し、グループ内のすべてのＧＰＳ受信端末に現在位置を表示し、さらにはグループ内の一部、もしくは全部のＧＰＳ受信端末との間で近距離無線通信ができなくなったときに、そのＧＰＳ受信端末がグループから離れたとして離別地点で合流（グループ復帰）できるように案内表示を行うものである。 (Embodiment 1)
In the first embodiment, in a group formed by a plurality of GPS receiving terminals in which a common group ID is registered, the short-range wireless communication for transmitting and receiving a call signal including the common group ID is performed and the GPS of the representative GPS receiving terminal is used. Shares location information obtained by positioning, displays current location on all GPS receivers in the group, and disables short-range wireless communication with some or all GPS receivers in the group When the GPS receiving terminal is separated from the group, guidance display is performed so that it can join (return to the group) at the separation point.

図１は、本発明の実施の形態１に係るＧＰＳ受信端末の構成を示すブロック図である。図１に示すように、ＧＰＳ受信部１０１と、近距離無線送受信部１０２と、表示部１０４と、入力部１０５と、リンク監視部１０６と、グループ情報記憶部１０７と、位置情報記憶部１０８と、地図情報記憶部１０９と、測位演算部１１０と、を制御部１０３に接続して備えている。   FIG. 1 is a block diagram showing a configuration of a GPS receiving terminal according to Embodiment 1 of the present invention. As shown in FIG. 1, a GPS receiving unit 101, a short-range wireless transmission / reception unit 102, a display unit 104, an input unit 105, a link monitoring unit 106, a group information storage unit 107, and a position information storage unit 108 The map information storage unit 109 and the positioning calculation unit 110 are connected to the control unit 103.

ＧＰＳ受信部１０１は、ＧＰＳ衛星信号を受信し現在位置情報（緯度、経度等）を取得する。   The GPS receiving unit 101 receives GPS satellite signals and acquires current position information (latitude, longitude, etc.).

近距離無線送受信部１０２は、近距離にある他のＧＰＳ受信端末と直接無線による通信を行い、共通のグループＩＤが登録されたＧＰＳ受信端末と現在位置情報等を送信もしくは受信する。また、近距離無線送受信部１０２は、近距離無線通信により、近距離にある代表のＧＰＳ受信端末の行なった測位演算の結果を受信する。   The short-range wireless transmission / reception unit 102 performs direct wireless communication with other GPS reception terminals in a short distance, and transmits or receives current position information and the like with a GPS reception terminal in which a common group ID is registered. The short-range wireless transmission / reception unit 102 receives the result of the positioning calculation performed by a representative GPS receiving terminal at a short distance by short-range wireless communication.

表示部１０４は、表示を行うためのユーザインターフェースである。   The display unit 104 is a user interface for performing display.

入力部１０５は、入力を行う。具体的には、入力部１０５は、ＧＰＳ受信装置の動作開始や終了、目的地の設定、グループＩＤ等の設定を行うユーザインターフェースである。   The input unit 105 performs input. Specifically, the input unit 105 is a user interface that performs operation start and end of the GPS receiver, destination setting, group ID setting, and the like.

リンク監視部１０６は近距離無線送受信部１０２が他のＧＰＳ受信端末との近距離無線通信の通信接続（リンク接続）状態を制御部１０３を経由しモニタし、近距離無線通信で通信中の他のＧＰＳ受信端末とのリンク接続状態を更新しながら保持する。   The link monitoring unit 106 monitors the communication connection (link connection) state of the short-distance wireless communication with the other GPS receiving terminals via the control unit 103, and the link monitoring unit 106 is communicating with the short-distance wireless communication. The link connection state with the GPS receiving terminal is updated and held.

グループ情報記憶部１０７は、グループ情報を記憶する。   The group information storage unit 107 stores group information.

位置情報記憶部１０８は、ＧＰＳ受信部１０１で取得した現在位置情報および近距離無線受信部１０２経由で取得した代表端末の位置情報を記憶する。   The position information storage unit 108 stores the current position information acquired by the GPS receiving unit 101 and the position information of the representative terminal acquired via the short-range wireless receiving unit 102.

地図情報記憶部１０９は、現在地位置や経路案内、グループ復帰案内等行う際の現在位置や目的地点を表示部１０４に表示する際の背景となる地図情報を保持する。   The map information storage unit 109 holds map information as a background when displaying the current position or destination point on the display unit 104 when performing the current position, route guidance, group return guidance, or the like.

表示部はＧＰＳ受信端末の画面上に現在地位置や経路案内、グループ復帰案内等を地図情報記憶部１０９が持つ地図情報を背景に表示する。グループＩＤの設定等の表示も行う。   The display unit displays the map information held by the map information storage unit 109 on the background of the current location, route guidance, group return guidance, and the like on the screen of the GPS receiving terminal. It also displays group ID settings and the like.

測位演算部１１０は、ＧＰＳ受信部１０１が受信したＧＰＳ信号に基づいて測位演算を行なう。   The positioning calculation unit 110 performs positioning calculation based on the GPS signal received by the GPS receiving unit 101.

制御部１０３は上記のすべての構成要素と接続され、以降に述べる制御動作を直接行うものであり、具体的にはグループＩＤの登録、ＧＰＳ受信部および近距離無線通信部状態によるリンク接続変更、経路案内やグループ復帰案内、代表端末／従属端末の変更など各種制御を行う。また、制御部１０３は近距離にある代表のＧＰＳ受信端末の行なった測位演算の結果を受信できる場合には、測位演算部１１０の測位演算を行なわせず、代表のＧＰＳ受信端末の行なった測位演算の結果を受信できない場合には、測位演算部１１０の測位演算を行なわせる。   The control unit 103 is connected to all the above-described components and directly performs the control operation described below. Specifically, the group ID registration, the link connection change by the GPS reception unit and the short-range wireless communication unit state, Various controls such as route guidance, group return guidance, and change of representative / subordinate terminal are performed. In addition, when the control unit 103 can receive the result of the positioning calculation performed by the representative GPS receiving terminal at a short distance, the positioning calculation performed by the representative GPS receiving terminal is not performed without performing the positioning calculation of the positioning calculating unit 110. If the calculation result cannot be received, the positioning calculation unit 110 performs the positioning calculation.

図２は、本発明の実施の形態１に係るＧＰＳ受信端末グループの通常時（グループ復帰対象のＧＰＳ受信端末がない場合）の構成および画面表示を示す図である。図２においてＧＰＳ受信端末グループ１（点線楕円内）は、ＧＰＳ受信端末１００ａ（代表端末）、ＧＰＳ受信端末１００ｂ、１００ｃ（従属端末１、２）の計３台で構成されている。これらは共通のグループＩＤで設定されており、ＧＰＳ受信端末１００ａ（代表端末）が代表として設定され、ＧＰＳ受信端末１００ｂ、１００ｃ（従属端末１、２）が従属端末として設定されている。   FIG. 2 is a diagram showing a configuration and screen display of the GPS receiving terminal group according to Embodiment 1 of the present invention at normal times (when there is no group receiving target GPS receiving terminal). In FIG. 2, the GPS receiving terminal group 1 (inside the dotted ellipse) is composed of a total of three GPS receiving terminals 100a (representative terminals) and GPS receiving terminals 100b and 100c (dependent terminals 1 and 2). These are set with a common group ID, the GPS receiving terminal 100a (representative terminal) is set as a representative, and the GPS receiving terminals 100b and 100c (dependent terminals 1 and 2) are set as dependent terminals.

図２のＧＰＳ受信端末グループ１は代表端末であるＧＰＳ受信端末１００ａが複数のＧＰＳ衛星５からの測位信号を受信し現在位置情報（緯度・経度）を連続的もしくは定期的に取得する。ＧＰＳ受信端末１００ｂ、１００ｃ（従属端末１、２）は、代表端末近距離無線通信エリア６内で通信可能であればＧＰＳ受信端末１００ａ（代表端末）とほぼ同一の場所にいると判断し、ＧＰＳ測位は行わずＧＰＳ受信端末１００ａ（代表端末）より近距離無線通信を通じて定期的に現在位置情報を受信する。ＧＰＳ受信端末１００ａ（代表端末）は自己で取得した現在位置情報をもとに、画面上に現在位置を更新、表示する（図の右側）。また、ＧＰＳ受信端末１００ｂ、１００ｃ（従属端末１、２）は、ＧＰＳ受信端末１００ａ（代表端末）より送信された位置情報をもとに、画面上に現在位置を更新、表示する（図の右側）。   In the GPS receiving terminal group 1 of FIG. 2, the GPS receiving terminal 100a, which is a representative terminal, receives positioning signals from a plurality of GPS satellites 5 and acquires current position information (latitude / longitude) continuously or periodically. If the GPS receiving terminals 100b and 100c (subordinate terminals 1 and 2) are communicable within the representative terminal short-range wireless communication area 6, the GPS receiving terminals 100b and 100c are determined to be in substantially the same location as the GPS receiving terminal 100a (representative terminal). Positioning is not performed, and current position information is periodically received from the GPS receiving terminal 100a (representative terminal) through short-range wireless communication. The GPS receiving terminal 100a (representative terminal) updates and displays the current position on the screen based on the current position information acquired by itself (right side in the figure). The GPS receiving terminals 100b and 100c (subordinate terminals 1 and 2) update and display the current position on the screen based on the position information transmitted from the GPS receiving terminal 100a (representative terminal) (right side of the figure). ).

図３は、図２で示した本発明の実施の形態１に係るＧＰＳ受信端末グループ１から１つの端末が別離しグループ復帰案内を行う場合の構成および画面表示を示す図である。図３において、ＧＰＳ受信端末１００ａ、１００ｂ、１００ｃの構成は図１、２と同一である。ただし、ＧＰＳ受信端末１００ｃ（従属端末２）が、代表端末近距離無線通信エリア６から外れている。その際、ＧＰＳ受信端末１００ａ（代表端末）は、ＧＰＳ受信端末１００ｃ（従属端末２）との接続不可となったことを検出し、グループ復帰案内のため接続不可となった直前の地点（別離地点）までの経路を表示し、現在位置情報を更新しながらグループ復帰案内を行う（図右上）。一方、ＧＰＳ受信端末１００ｃ（従属端末２）は、ＧＰＳ受信端末１００ａ（代表端末）と同様に複数のＧＰＳ衛星５からの測位信号を受信し、ＧＰＳ受信端末１００ｃ（従属端末２）の現在位置情報（緯度・経度）を連続的もしくは定期的に取得する。そして、ＧＰＳ受信端末１００ｃ（従属端末２）は、予め保持している接続不可の直前の離別地点を目的地として現在位置情報を更新しながらグループ復帰案内を行う。   FIG. 3 is a diagram showing a configuration and screen display when one terminal separates from the GPS receiving terminal group 1 according to Embodiment 1 of the present invention shown in FIG. 2 and performs group return guidance. In FIG. 3, the configurations of the GPS receiving terminals 100a, 100b, and 100c are the same as those in FIGS. However, the GPS receiving terminal 100c (subordinate terminal 2) is out of the representative terminal short-range wireless communication area 6. At that time, the GPS receiving terminal 100a (representative terminal) detects that the connection with the GPS receiving terminal 100c (subordinate terminal 2) is disabled, and the point immediately before the connection is disabled due to the group return guidance (separate separation point) ) Is displayed, and group return guidance is performed while updating the current position information (upper right in the figure). On the other hand, the GPS receiving terminal 100c (subordinate terminal 2) receives positioning signals from a plurality of GPS satellites 5 in the same manner as the GPS receiving terminal 100a (representative terminal), and current position information of the GPS receiving terminal 100c (subordinate terminal 2). Acquire (latitude / longitude) continuously or periodically. Then, the GPS receiving terminal 100c (the subordinate terminal 2) performs group return guidance while updating the current position information with the pre-retained separation point immediately before connection impossible as a destination.

ここで近距離無線通信は、携帯電話等の基地局経由の通信に用いられる無線電波より弱い電力によって行われ、具体的には、Ｂｌｕｅｔｏｏｔｈ（登録商標）、ＵＷＢ（Ｕｌｔｒａ Ｗｉｄｅ Ｂａｎｄ）、ワイヤレスＬＡＮ、ＺｉｇＢｅｅ、特定省電力無線などが適用可能である。これらの近距離無線通信はいずれもＧＰＳ受信端末間の通信手段とし、さらに想定される距離範囲にいるかを無線通信接続状態で確認することができる利点がある。   Here, short-range wireless communication is performed with power weaker than radio waves used for communication via a base station such as a mobile phone. Specifically, Bluetooth (registered trademark), UWB (Ultra Wide Band), wireless LAN, ZigBee, specific power-saving radio, etc. are applicable. Any of these short-range wireless communications is a means for communicating between GPS receiving terminals, and further has an advantage that it can be confirmed in a wireless communication connection state whether it is within an assumed distance range.

特に、Ｂｌｕｅｔｏｏｔｈは、中心周波数を２．４５ＧＨｚとする帯域の電波で、送信電力を制御することによって伝送距離を約１００ｍ（クラス１）、約２５ｍ（クラス２） 、又は約１０ｍ（クラス３）のいずれかに調整することができるため、Ｂｌｕｅｔｏｏｔｈを本発明の近距離無線通信に採用した場合、上記代表端末無線通信エリア６を約１００ｍ、約２５ｍ、又は約１０ｍの等に設定することが可能である。   In particular, Bluetooth is a radio wave with a center frequency of 2.45 GHz, and the transmission distance is about 100 m (class 1), about 25 m (class 2), or about 10 m (class 3) by controlling the transmission power. Therefore, when the Bluetooth is adopted for the short-range wireless communication of the present invention, the representative terminal wireless communication area 6 can be set to about 100 m, about 25 m, or about 10 m. is there.

またＺｉｇＢｅｅは中心周波数８６８ＭＨｚ、９１５ＭＨｚ、２．４ＧＨｚの３種類が規定されている（日本国内では２．４ＧＨｚのみ）。ＺｉｇＢｅｅの特徴として上記Ｂｌｕｅｔｏｏｔｈがサポートするネットワークトポロジーであるスター型（マスタ、スレーブによる１対Ｎ通信）だけでなく、ピア・トゥー・ピア（Ｐ ｔｏ Ｐ）通信によるメッシュ型もサポートしている。そのため、ある特定のノード（ここではＧＰＳ受信端末）を介さずそれぞれのノードがメッシュ状に接続可能となるが、その際も図２および図３の説明で行った代表端末および従属端末の通信の際、途中で他のＧＰＳ受信端末を経由するネットワーク構成となるものの、それぞれのＧＰＳ受信端末の動作および以降に示す動作・構成も同様に実現できるものである。さらに代表端末が直接通信できない従属端末が発生しても、別の従属端末を経由して通信を実現できるという利点がある。   ZigBee has three types of center frequencies of 868 MHz, 915 MHz, and 2.4 GHz (in Japan, only 2.4 GHz). As a feature of ZigBee, not only the star type (one-to-N communication by master and slave) which is a network topology supported by the above-described Bluetooth, but also a mesh type by peer-to-peer (P to P) communication is supported. For this reason, each node can be connected in a mesh form without going through a specific node (here, a GPS receiving terminal). In this case as well, the communication between the representative terminal and the subordinate terminal performed in the description of FIGS. At this time, although the network configuration passes through another GPS receiving terminal on the way, the operation of each GPS receiving terminal and the operation / configuration described below can be realized in the same manner. Furthermore, even if a subordinate terminal that cannot be directly communicated with the representative terminal is generated, there is an advantage that communication can be realized via another subordinate terminal.

以上のように構成された複数のＧＰＳ受信端末によるグループでの動作について説明する。   An operation in a group by a plurality of GPS receiving terminals configured as described above will be described.

図４はＧＰＳ受信端末の動作を示す全体フローチャートを示す。図４は大きく８つのフロー（初期代表決定フローＦ００１、代表端末通常動作フローＦ００２、従属端末通常動作フローＦ００３、リンク再接続（代表端末）フローＦ００４、リンク再接続（従属端末）フローＦ００５、グループ復帰動作（代表）フローＦ００６、グループ復帰動作（従属）フローＦ００７、グループ復帰動作（単独）フローＦ００８）に分かれている。これら各フローの詳細動作は図５以降で説明するが、図４では全体の流れを説明するために、各フローの動作の詳細は省略して記載している。   FIG. 4 is an overall flowchart showing the operation of the GPS receiving terminal. FIG. 4 shows roughly eight flows (initial representative decision flow F001, representative terminal normal operation flow F002, dependent terminal normal operation flow F003, link reconnection (representative terminal) flow F004, link reconnection (dependent terminal) flow F005, group return. Operation (representative) flow F006, group return operation (subordinate) flow F007, and group return operation (single) flow F008). The detailed operation of each flow will be described with reference to FIG. 5 and subsequent figures. In FIG. 4, the details of the operation of each flow are omitted in order to explain the overall flow.

図４ではまず初期代表決定フローＦ００１にて初期代表決定（ＳＴ１０１）を行う。ＳＴ１０１で代表端末の設定が、従属端末への設定かを決定する。代表端末となった場合、代表端末通常動作フローＦ００２に従い、近距離無線での１対Ｎ通信のマスタ端末となるとともに共通グループＩＤのＧＰＳ受信端末からの接続要求に応じ、グループの端末登録を行う（ＳＴ１０２）。従属端末となった場合には共通グループＩＤに設定し近距離無線を通じて代表端末に接続要求を行い従属端末へ設定される。   In FIG. 4, first, the initial representative determination (ST101) is performed in the initial representative determination flow F001. In ST101, it is determined whether the representative terminal is set as a subordinate terminal. When it becomes a representative terminal, it becomes a master terminal for one-to-N communication over short-range wireless according to the representative terminal normal operation flow F002, and performs group terminal registration in response to a connection request from a GPS receiving terminal with a common group ID. (ST102). If it becomes a subordinate terminal, it is set as a common group ID, a connection request is made to the representative terminal through short-range radio, and the subordinate terminal is set.

＜代表端末と決定されたＧＰＳ受信端末の動作＞
登録完了後、代表端末としての代表端末通常動作フローＦ００２に従い、通常動作（他のＧＰＳ受信端末との近距離無線通信の接続（リンク）数がグループ登録された端末数と一致すれば、ＧＰＳ測位、現在位置送信、自己位置の表示・記憶）（ＳＴ１０５）を繰り返す。 <Operation of GPS receiving terminal determined as representative terminal>
After completion of registration, according to the representative terminal normal operation flow F002 as the representative terminal, if the normal operation (the number of short-range wireless communication connections (links) with other GPS receiving terminals matches the number of terminals registered in the group, GPS positioning is performed. , Current position transmission, self-position display / storage) (ST105) is repeated.

一方、ＳＴ１０５にて他のＧＰＳ受信端末との近距離無線通信のリンク数が減ったことを確認した場合、リンク再接続動作（代表端末）（リンク再接続（代表端末）フローＦＬ００４のＳＴ１１３）に移行する。また、リンク先がない場合にはグループ復帰動作（単独）開始（グループ復帰動作（単独）フローＦＬ００８のＳＴ１２９）に移行する。   On the other hand, if it is confirmed in ST105 that the number of short-distance wireless communication links with other GPS receiving terminals has decreased, the link reconnection operation (representative terminal) (link reconnection (representative terminal) flow FL004 ST113) Transition. If there is no link destination, the process proceeds to the group return operation (single) start (ST129 of the group return operation (single) flow FL008).

リンク再接続動作（代表端末）（ＳＴ１１３）では、各ＧＰＳ受信端末同士のリンク数を測定し代表端末および各ＧＰＳ受信端末の動作を決定する（ＳＴ１１４）。 ＳＴ１１４では他のＧＰＳ受信端末でグループ内の全ＧＰＳ受信端末と接続可能なＧＰＳ受信端末がある場合にはそのＧＰＳ受信端末が代表端末とし、代表であったＧＰＳ受信端末は従属端末となりグループとしてのこれまでの動作を継続する（ＳＴ１３３）。自端末からのリンク可能端末数が最も多い場合にはグループ復帰動作開始（代表）（ＳＴ１１５）に移行する。また他のＧＰＳ受信端末からのリンク可能端末数が最も多い場合には自らは従属端末となりグループ復帰動作（従属）（ＳＴ１２２）に移行し、リンク数が最も多いＧＰＳ受信端末を代表端末とする。またリンク再接続動作（代表）（ＳＴ１１３）ではリンク可能端末数によって判定し、代表端末の変更を行ったが、各端末からのリンク時の信号品質（ＲＳＳＩ等の受信レベルやＳ／Ｎ比）がトータルで高い端末（受信マージンの確保）、もしくは平均的である端末を（中心位置に配置されていると推定されるため）代表にすることでも良い。これらの動作によって代表端末をより他の従属端末と安定的に接続できるようになり、リンク切断を抑えることが出来る。   In the link reconnection operation (representative terminal) (ST113), the number of links between the GPS receiving terminals is measured to determine the operations of the representative terminal and each GPS receiving terminal (ST114). In ST114, when there is a GPS receiving terminal that can be connected to all the GPS receiving terminals in the group by another GPS receiving terminal, that GPS receiving terminal becomes the representative terminal, and the representative GPS receiving terminal becomes the subordinate terminal and becomes the group. The operation so far is continued (ST133). When the number of linkable terminals from the own terminal is the largest, the process proceeds to start of group return operation (representative) (ST115). When the number of linkable terminals from other GPS receiving terminals is the largest, the terminal itself becomes a dependent terminal and moves to the group return operation (dependent) (ST122), and the GPS receiving terminal with the largest number of links is set as the representative terminal. In link reconnection operation (representative) (ST113), the number of linkable terminals is determined and the representative terminal is changed. The signal quality at the time of link from each terminal (reception level such as RSSI and S / N ratio) May be represented by a terminal having a high total (reserving a reception margin) or an average terminal (because it is estimated to be located at the center position). Through these operations, the representative terminal can be stably connected to other subordinate terminals, and link disconnection can be suppressed.

また代表端末の通常動作（ＧＰＳ測位、現在位置情報送信）を繰り返す（ＳＴ１０５）際、電力消費が代表端末にのみ集中するため、一定の期間もしくは定期的に代表端末を入れ替えることを行っても良い。その際は代表端末が従属端末を任意で決定しても良いし、上記のリンク可能端末数や信号品質の計測を行った後現状の代表端末が従属端末を指定するのでも良い。   Further, when the normal operation (GPS positioning, current position information transmission) of the representative terminal is repeated (ST105), since the power consumption is concentrated only on the representative terminal, the representative terminal may be replaced periodically or periodically. . In that case, the representative terminal may arbitrarily determine the subordinate terminal, or the current representative terminal may designate the subordinate terminal after measuring the number of linkable terminals and the signal quality.

＜従属端末と決定されたＧＰＳ受信端末の動作＞
従属端末となった場合、従属端末通常動作フローＦＬ００３に従い、従属端末としての動作を開始し（ＳＴ１０７）、代表のＧＰＳ受信端末との近距離無線通信の接続（リンク）が通常通り行われていれば、代表端末から送信される現在位置情報を取得し、自己位置の表示・記憶（ＳＴ１０５）を繰り返す（ＳＴ１０８）。一方、代表のＧＰＳ受信端末との近距離無線通信の接続リンクがなくなった場合、リンク再接続フロー（従属端末）（ＦＬ００５のＳＴ１１０）に移行する。 <Operation of GPS receiving terminal determined as subordinate terminal>
If it becomes a subordinate terminal, the operation as a subordinate terminal is started in accordance with the subordinate terminal normal operation flow FL003 (ST107), and the short distance wireless communication connection (link) with the representative GPS receiving terminal is normally performed. For example, the current position information transmitted from the representative terminal is acquired, and the self-position display / storage (ST105) is repeated (ST108). On the other hand, when the short-range wireless communication connection link with the representative GPS receiving terminal is lost, the process proceeds to the link reconnection flow (subordinate terminal) (ST110 of FL005).

リンク再接続動作（従属端末）（ＳＴ１１０）では、各ＧＰＳ受信端末同士のリンク数を測定し代表端末および各ＧＰＳ受信端末の動作モードを決定する（ＳＴ１１１およびＳＴ１１２）。リンク先はあるが代表端末がなく自端末が代表になる場合には前述のリンク再接続動作（代表）（ＳＴ１１３）に移行する。また自端末がリンク数大の場合には前述のグループ復帰動作（代表）フローＦＬ００６（ＳＴ１１５）に移行する。他のＧＰＳ受信端末でグループ内に全ＧＰＳ受信端末と接続可能なＧＰＳ受信端末がある場合、もしくは他のＧＰＳ受信からのリンク数が最も多い場合には自端末は前述のグループ復帰動作（従属）フローＦＬ００７（ＳＴ１２２）に移行する。またリンク先となる接続可能なＧＰＳ受信端末がない場合は前述のグループ復帰動作（単独）フローＦＬ００８（ＳＴ１２９）に移行する。   In the link reconnection operation (subordinate terminal) (ST110), the number of links between the GPS receiving terminals is measured, and the operation mode of the representative terminal and each GPS receiving terminal is determined (ST111 and ST112). If there is a link destination but there is no representative terminal and the own terminal becomes the representative, the process proceeds to the above-described link reconnection operation (representative) (ST113). If the terminal itself has a large number of links, the process proceeds to the group return operation (representative) flow FL006 (ST115). When there is a GPS receiving terminal that can be connected to all GPS receiving terminals in the group with other GPS receiving terminals, or when the number of links from other GPS receptions is the largest, the own terminal returns to the above-described group return operation (subordinate) The flow shifts to flow FL007 (ST122). If there is no connectable GPS receiving terminal as the link destination, the flow proceeds to the group return operation (single) flow FL008 (ST129).

＜代表端末／従属端末のＧＰＳ受信端末のグループ復帰動作開始後の動作＞
グループ復帰動作開始（代表）（ＳＴ１１５）からは代表となったＧＰＳ受信端末が目的地をリンク先が減ったもしくは無くなった直前の地点（離別地点）とし、ＧＰＳ測位、現在位置送信、自己位置の表示・記憶（ＳＴ１１６）を繰り返しながらグループの復帰・合流のための案内を行う。 <Operation after start of group return operation of representative terminal / subordinate terminal GPS receiving terminal>
From the start of group return operation (representative) (ST115), the representative GPS receiving terminal sets the destination as the point immediately before the link destination decreased or disappeared (separation point), GPS positioning, current position transmission, self-location While repeating the display and storage (ST116), guidance for returning and joining the group is performed.

グループ復帰動作開始（従属）（ＳＴ１２２）からも同様に代表端末から送信される現在位置情報を取得し、自己位置の表示・記憶（ＳＴ１２３）を繰り返しながらグループの復帰・合流のための案内を行う。 他にリンク可能な端末が無い場合のグループ復帰動作（単独）開始（ＳＴ１２９）からは目的地をリンク先が減ったもしくは無くなった直前の地点（離別地点）とし、ＧＰＳ測位、自己位置の表示・記憶（ＳＴ１３０）を繰り返しながらグループの復帰・合流のための案内を行う。   Similarly, the current position information transmitted from the representative terminal is acquired from the start (subordinate) (ST122) of the group return operation, and guidance for group return / joining is performed while repeating the display / storage (ST123) of the own position. . Starting from group return operation (single) when there is no other linkable terminal (ST129), the destination is the point immediately before the link destination has decreased or disappeared (separation point), GPS positioning, While repeating the storage (ST130), guidance for returning and joining the group is performed.

上記グループ復帰動作によって近距離無線通信のリンクが復活（グループ合流）した場合には代表端末、従属端末はそれぞれ前述の代表端末動作開始（ＳＴ１２０⇒ＳＴ１０４）、従属端末動作開始（ＳＴ１２７⇒ＳＴ１０７）に移行する。またグループ復帰動作（単独）を行っていた端末はリンクが復活（グループ合流）した場合には同様に従属端末動作開始（ＳＴ１３２⇒ＳＴ１０７）に移行する。   When the short-range wireless communication link is restored (group joining) by the group return operation, the representative terminal and the dependent terminal start the representative terminal operation start (ST120 → ST104) and the dependent terminal operation start (ST127 → ST107), respectively. Transition. In addition, when the link is restored (group join), the terminal that has been performing the group return operation (independent) proceeds to start dependent terminal operation (ST132 → ST107) in the same manner.

一方グループ復帰動作中にリンク数減となった場合にも同様に前述のリンク再接続フロー（ＳＴ１１９⇒ＳＴ１１３（代表端末の場合）、ＳＴ１２６⇒ＳＴ１１０（従属端末の場合））に移行する。またリンク先が無くなった場合には前述のグループ復帰動作（単独）開始（ＳＴ１２１、ＳＴ１２８⇒ＳＴ１２９）に移行する。   On the other hand, when the number of links is reduced during the group return operation, the flow similarly shifts to the above-described link reconnection flow (ST119 → ST113 (in the case of a representative terminal), ST126 → ST110 (in the case of a subordinate terminal)). If there is no link destination, the process proceeds to the above-described group return operation (independent) start (ST121, ST128 => ST129).

次に図４の８つのフローＦ００１〜８の各詳細な個別動作を図５〜１２に示す。   Next, detailed individual operations of the eight flows F001 to F8 in FIG. 4 are shown in FIGS.

図５は初期代表決定フローを示している。初期代表決定フローは開始（ＳＳＴ１１０）後、アプリがユーザ操作または自動で起動され（ＳＳＴ１０１）、グループ共通のＩＤとなるグループＩＤを設定する（ＳＳＴ１０３）。ＩＤ設定は予めグループ間で決めた共通のもの、自動で指定されるもの、いくつか指定されたものから選択するものいずれでも良い。さらに近距離無線通信を開始し（ＳＳＴ１０４）、ＳＳＴ１０５にて既に同グループＩＤの端末を接続できれば、自端末は従属端末に設定され、グループ登録（ＳＳＴ１０８）を経て、従属端末動作（ＳＳＴ１０９）へと移行する。一方、ＳＳＴ１０５にて他に同一グループＩＤがなければ自端末が代表端末に設定され、グループへの端末登録待ち（ＳＳＴ１０６）を経て代表端末動作（ＳＳＴ１０７）へと移行する。   FIG. 5 shows an initial representative determination flow. After the initial representative determination flow is started (SST110), the application is activated by a user operation or automatically (SST101), and a group ID that is a common ID for the group is set (SST103). The ID setting may be a common ID determined in advance among the groups, an automatically specified one, or one selected from several specified ones. Further, short-range wireless communication is started (SST104), and if a terminal having the same group ID can be connected in SST105, the local terminal is set as a subordinate terminal, and after group registration (SST108), the subordinate terminal operation (SST109) is performed. Transition. On the other hand, if there is no other same group ID in SST105, the own terminal is set as the representative terminal, and the process proceeds to representative terminal operation (SST107) after waiting for terminal registration in the group (SST106).

図６は代表端末通常動作フローを示している。代表端末通常動作フローは動作開始（ＳＳＴ２００）後、ＧＰＳ測位を実施し（ＳＳＴ２０１）、自端末の位置を地図もしくは緯度経度等を表示する。ＳＳＴ２０３にて従属している端末との近距離無線接続状態（リンク）を確認する。リンク接続に問題がなければ近距離無線にて全従属端末に現在位置を送信しあわせて位置を保存し（ＳＳＴ２０４）、再度ＳＳＴ２０１のＧＰＳ測位を行う。ここでＧＰＳ測位については上記のように従属端末に位置情報を送信する毎に測位するのでも良いし、定常的に測位しある周期もしくは位置を送る毎に位置情報を伝達できるようにしておくのでも良い。ＳＳＴ２０２の近距離無線接続状態（リンク）を確認で全従属端末とのリンク接続状態でないと判定した場合には、リンク不可となった端末数が全数であれば、単独でグループを探し復帰するグループ復帰動作（単独）開始（ＳＳＴ２０７）に移行する。０リンク数が１以上であればリンク再接続フロー（代表）（ＳＳＴ２０８）に移行する。   FIG. 6 shows a typical terminal normal operation flow. In the representative terminal normal operation flow, after starting the operation (SST200), GPS positioning is performed (SST201), and the position of the terminal is displayed as a map or latitude / longitude. The short-range wireless connection state (link) with the subordinate terminal is confirmed in SST203. If there is no problem in link connection, the current position is transmitted to all subordinate terminals by short-range radio, and the position is stored (SST204), and GPS positioning of SST201 is performed again. Here, the GPS positioning may be performed every time the position information is transmitted to the subordinate terminal as described above, or the position information can be transmitted every time a period or position where the positioning is constantly performed is transmitted. But it ’s okay. If it is determined that the short-range wireless connection state (link) of SST202 is not a link connection state with all subordinate terminals, if the number of terminals that cannot be linked is the total number, the group that searches for the group and returns The process proceeds to the return operation (independent) start (SST 207). If the number of 0 links is 1 or more, the flow proceeds to a link reconnection flow (representative) (SST 208).

図７は従属端末通常動作フローを示している。動作開始後（ＳＳＴ３００）、代表端末との近距離無線リンク接続を確認し（ＳＳＴ３０１）ＯＫであれば近距離無線で現在位置を受信し併せて位置を記憶する（ＳＳＴ３０２）。さらに受信した位置に応じて地図や緯度経度等を表示し（ＳＳＴ３０３）、ＳＳＴ３０１に戻る。ＳＳＴ３０１にて接続できない場合にはリンク再接続フロー（従属）（ＳＳＴ３０４）に移行する。   FIG. 7 shows a subordinate terminal normal operation flow. After the operation is started (SST300), the short-distance wireless link connection with the representative terminal is confirmed (SST301). If OK, the current position is received by the short-range wireless and the position is stored (SST302). Further, a map, latitude / longitude, and the like are displayed according to the received position (SST303), and the process returns to SST301. If connection cannot be established in SST301, the flow proceeds to a link reconnection flow (subordinate) (SST304).

図８はリンク再接続（代表端末）フローを示している。開始（ＳＳＴ４００）後、従属端末（代表端末をその時点で接続されている端末すべて）に対し順に（もしくは一度に複数可能であれば複数）その従属端末からリンク可能な端末数を計測するように要求し、計測結果を受信する（ＳＳＴ４０１）。これは、どの従属端末が最も接続性が良いか（多くの従属端末と接続可能か）を計測するためである。ＳＳＴ４０２にてＳＳＴ４０１で計測した他の端末での最大接続数により、全数とリンクできる端末があればＳＳＴ４０３にて、全数とリンクできる端末を代表端末に設定し、自端末は従属端末に変更し、自端末は従属端末としての動作を行う（ＳＳＴ４０４）。ＳＳＴ４０２にて全数とリンク接続可能な端末がない場合にはＳＳＴ４０５にてリンク接続数が最も多いのが自端末であればＳＳＴ４０６にて他端末にグループ復帰動作開始（従属）を要請し、自端末はグループ復帰動作（代表）（ＳＳＴ４０７）を開始する。またＳＳＴ４０５で最もリンク接続数が多いのが自端末でない場合には、最大のリンク接続数をもつ端末を代表端末に移行要請し、自端末は従属端末に移行（ＳＳＴ４０８）しグループ復帰動作（従属）開始（ＳＳＴ４０９）を行う。   FIG. 8 shows a link reconnection (representative terminal) flow. After the start (SST400), the number of terminals that can be linked from the dependent terminal is sequentially measured (or plural if a plurality of representative terminals are connected at that time) in order (or a plurality if it is possible at one time). Request and receive measurement result (SST401). This is for measuring which subordinate terminal has the best connectivity (can be connected to many subordinate terminals). In SST402, if there is a terminal that can be linked to the total number by the maximum number of connections in other terminals measured in SST401, in SST403, a terminal that can be linked to the total number is set as a representative terminal, and the own terminal is changed to a subordinate terminal, The own terminal operates as a subordinate terminal (SST 404). If there is no terminal that can be link-connected to the total number in SST 402, if the own terminal has the largest number of link connections in SST 405, it requests the other terminal to start (subordinate) the group return operation in SST 406, and Starts the group return operation (representative) (SST407). In SST 405, if it is not the own terminal that has the largest number of link connections, the terminal having the maximum number of link connections is requested to move to the representative terminal, and the own terminal shifts to the dependent terminal (SST 408) and performs a group return operation (dependent). ) Start (SST409).

図９はリンク再接続（従属）フローを示している。開始後（ＳＳＴ５００）、代表端末との接続によって（ＳＳＴ５０１）接続がありの場合はある期限を設けたタイマーをスタートし（ＳＳＴ５０２）タイマーの期限（数秒〜数分で指定）の間に各種他端末からの要請に対応する。まず、他端末からリンク数（自端末が何台の端末とリンクできるか）計測要求がある場合にはＳＳＴ５０４に移行し接続可能な端末数を計測した結果を代表端末に通知する。次にＳＳＴ５０５にて代表端末への移行要請がある場合、ＳＳＴ５０９にて自端末を従属端末から代表端末に変更し、他端末にグループ復帰動作開始要請（ＳＳＴ５１０）、自端末は代表端末としてグループ復帰動作（代表）を開始する（ＳＳＴ５１２）。またＳＳＴ５０５にてＮｏの場合（代表端末への移行要請なし）、さらにＳＳ５０６にて代表端末よりグループ復帰動作開始要請があればグループ復帰動作開始（従属）（ＳＳＴ５１１）へ移行する。ＳＳＴ５０６にてＮｏの場合（代表端末よりグループ復帰動作開始要請なし）、ＳＳＴ５０７にてタイマーが期限（規定）内であれば再度ＳＳＴ５０３に戻る。タイマが規定を超えていればグループ復帰動作（単独）を開始する（ＳＳＴ５０８）。またＳＳＴ５０１にてＮｏ（代表端末とのリンクがない場合）、他の端末との接続がなければ（Ｎｏの場合）、ＳＳＴ５０８のグループ復帰動作（単独）開始（ＳＳＴ５０８）へ移行する。ＳＳＴ５１３でＹｅｓの場合（他端末との接続あり）、他端末との代表決定ネゴシエーション（ＳＳＴ５１４）（代表端末がない場合に他の端末にリンク数計測要請等を行う端末がないため、他端末とネゴシエーションの結果（接続されている端末からランダムで決定、もしくは最初にＳＳＴ５１４のステータスに端末に決定等）を行う）結果で自端末が代表（Ｙｅｓ）となった場合には自端末を従属端末から代表端末に変更（ＳＳＴ５１５）し、リンク再接続（代表）（ＳＳＴ５１６）に移行する。ＳＳＴ５１４にてＮｏ（ネゴシエーションで自端末は代表とならない）の場合ＳＳＴ５０３に移行し、以降は上記ＳＳＴ５０２以降の動作を行う。   FIG. 9 shows a link reconnection (subordinate) flow. After the start (SST500), when there is a connection with the representative terminal (SST501), if there is a connection, a timer with a certain time limit is started (SST502), and various other terminals during the time limit of the timer (specified in seconds to minutes) Respond to requests from. First, when there is a request for measuring the number of links (how many terminals can be linked with the own terminal) from another terminal, the process proceeds to SST 504 to notify the representative terminal of the result of measuring the number of connectable terminals. Next, when there is a request for transition to the representative terminal in SST 505, the own terminal is changed from the subordinate terminal to the representative terminal in SST 509, a group return operation start request is sent to another terminal (SST 510), and the own terminal returns to the group as the representative terminal. The operation (representative) is started (SST512). If the answer is No in SST505 (no request for transition to the representative terminal), and if there is a group recovery operation start request from the representative terminal in SS506, the process proceeds to start of group recovery operation (subordinate) (SST511). In the case of No in SST 506 (no request for starting group return operation from the representative terminal), if the timer is within the time limit (regulation) in SST 507, the process returns to SST 503 again. If the timer exceeds the specified value, the group return operation (single) is started (SST508). Further, in SST501, No (when there is no link with the representative terminal), and if there is no connection with another terminal (in the case of No), the process proceeds to SST508 group return operation (single) start (SST508). If SST 513 is Yes (there is a connection with another terminal), representative decision negotiation with another terminal (SST 514) (there is no terminal that makes a link number measurement request or the like to the other terminal when there is no representative terminal, If the result of the negotiation (randomly determined from the connected terminal, or first determined by the terminal as the status of SST 514) is the representative terminal (Yes) as a result, It changes to a representative terminal (SST515), and shifts to link reconnection (representative) (SST516). If No in SST 514 (the own terminal is not representative in the negotiation), the process proceeds to SST 503, and thereafter, the operation after SST 502 is performed.

図１０にグループ復帰動作（単独）フローを示す。グループ復帰動作（単独）を開始（ＳＳＴ６００）後、ＧＰＳ測位（ＳＳＴ６０１）を行い、リンク接続ができ保存していた最終地点までの経路および自位置を地図上ないしは緯度経度、方向と距離などを表示する（ＳＳＴ６０２）、ＳＳＴ６０３にて他端末からリンク数計測要求がなければＧＰＳ測位を行い（ＳＳＴ６０４）、ＧＰＳ測位間隔であるインターバルタイマー（数秒〜数分で適宜設定）経過後（ＳＳＴ６０５）、自位置表示を更新し（ＳＳＴ６０６）、ＳＳＴ６０３に戻る、を繰り返す。またＳＳＴ６０３にて他端末とのリンク計測要求があり（Ｙｅｓ）、ＳＳＴ６０７にて代表端末とのリンク接続が確立できれば自端末を従属端末動作に移行し（ＳＳＴ６０８）、従属端末としての動作を開始する（ＳＳＴ６０９）。ＳＳＴ６０７にてＮｏ（代表端末とのリンク接続不可の場合）、ＳＳＴ６０４に移行する。   FIG. 10 shows a group return operation (single) flow. After group return operation (single) is started (SST600), GPS positioning (SST601) is performed, and the route to the last point that can be linked and saved and the current position are displayed on the map or latitude and longitude, direction and distance, etc. If there is no link number measurement request from another terminal in SST603 (SST602), GPS positioning is performed (SST604), and after the interval timer (several seconds to several minutes is set), which is the GPS positioning interval, (SST605) The display is updated (SST606), and the process returns to SST603. If there is a link measurement request with another terminal in SST603 (Yes) and the link connection with the representative terminal can be established in SST607, the terminal shifts to the dependent terminal operation (SST608) and starts the operation as a dependent terminal. (SST609). In SST607, No (when link connection with the representative terminal is not possible), the process proceeds to SST604.

図１１にグループ復帰動作（代表）フローを示す。グループ復帰動作（代表）を開始（ＳＳＴ７００）後、ＧＰＳ測位を行い（ＳＳＴ７０１）、リンク接続ができ保存していた最終地点までの経路および自位置を地図上ないしは緯度経度、方向と距離などを表示する（ＳＳＴ７０２）、ＳＳＴ７０３では最新グループ（リンク接続できているその時点で最新の端末グループ）でのリンク接続がＯＫであればＳＳＴ７０４にて不明となっている端末へのリンク確認を行いリンクなければ（Ｎｏ）近距離無線にてＧＰＳ測位で取得した現在位置をグループに送信し（ＳＳＴ７０５）、ＧＰＳ測位間隔であるインターバルタイマー（数秒〜数分で適宜設定）経過後（ＳＳＴ７０６）、自位置表示を更新し（ＳＳＴ７０７）、ＳＳＴ７０３に戻る、を繰り返す。ＳＳＴ７０３にてＮｏ（最新グループの全端末からリンクができなくなった場合）ＳＳＴ７１１にてその接続不可端末数に応じて、全数接続できない場合はグループ復帰動作（単独）開始（ＳＳＴ７１２）に移行する。また全数ではない場合にはリンク再接続フロー（代表）に移行する。また、ＳＳＴ７０４にてＹｅｓ（リンク接続できず不明となっている端末とのリンクが出来た）場合、リンク可能となった端末に従属接続動作へ移行を要請し（ＳＳＴ７０８）する。ＳＳＴ７０９にて不明の端末が他にない場合には、他の全端末に従属端末動作への移行を要請し（ＳＳＴ７１０）、自端末は通常の動作代表端末動作を開始する（ＳＳＴ７１４）。ＳＳＴ７０９にて不明の端末が他にもある場合にはグループ情報を更新し（リンク可能となった端末をグループに追加した上で）ＳＳＴ７０３へ移行する。   FIG. 11 shows a group return operation (representative) flow. After starting the group return operation (representative) (SST700), GPS positioning is performed (SST701), and the route to the last point that has been linked and saved and the current position are displayed on the map or latitude / longitude, direction and distance, etc. In SST 703, if the link connection in the latest group (the latest terminal group at which the link connection can be made) is OK in SST 703, the link confirmation to the terminal that is unknown in SST 704 is performed and there is no link. (No) The current position acquired by GPS positioning by short-range radio is transmitted to the group (SST705), and after the interval timer (which is appropriately set in several seconds to several minutes) elapses (SST706), the self-position display is displayed. Update (SST707) and return to SST703. No in SST 703 (when links cannot be established from all terminals in the latest group) If all the terminals cannot be connected in SST 711 according to the number of terminals that cannot be connected, the process proceeds to start of group return operation (independent) (SST 712). If it is not the total number, the flow shifts to a link reconnection flow (representative). In SST 704, if the link is established with a terminal that is unknown because the link cannot be connected, a request is made to make a transition to the slave connection operation to the terminal that can be linked (SST 708). If there is no other unknown terminal in SST 709, all other terminals are requested to shift to the dependent terminal operation (SST 710), and the own terminal starts normal operation representative terminal operation (SST 714). If there are other unknown terminals in SST 709, the group information is updated (after adding the link enabled terminal to the group), the process proceeds to SST 703.

図１２にグループ復帰動作（従属）フローを示す。グループ復帰動作（従属）を開始（ＳＳＴ８００）後、代表端末とのリンク接続を確認し（ＳＳＴ８０１）、ＯＫであればＳＳＴ８０２にて代表端末からの従属端末動作への移行要請がなければ代表端末から近距離無線で現在位置を受信し（ＳＳＴ８０３）、自位置表示を更新し（ＳＳＴ８０４）、ＳＳＴ８０１に戻る、を繰り返す。またＳＳＴ８０１でＮｏ（代表端末とのリンク接続不可）の場合には接続可能端末数有無に応じて（ＳＳＴ８０５）、有りの場合にはリンク再接続（従属）動作（ＳＳＴ８０７）、無しの場合にはグループ復帰動作（単独）（ＳＳＴ８０６）へ移行する。   FIG. 12 shows a group return operation (subordinate) flow. After starting the group return operation (subordinate) (SST800), the link connection with the representative terminal is confirmed (SST801), and if it is OK, if there is no request for transition from the representative terminal to the subordinate terminal operation in SST802, the representative terminal The current position is received by the short-range wireless (SST 803), the own position display is updated (SST 804), and the process returns to SST 801. If SST 801 is No (link connection with a representative terminal is not possible), depending on the number of connectable terminals (SST 805), if there is, link reconnection (subordinate) operation (SST 807), if not, The process proceeds to the group return operation (single) (SST806).

以上、図４〜１２に示した構成・動作は一例の構成であり、動作に影響しない範囲でのフローの順序の変更をしても構わない。   As described above, the configurations and operations shown in FIGS. 4 to 12 are examples, and the order of the flows may be changed within a range that does not affect the operations.

以上説明した第１の実施の形態では、グループでの移動で経路案内や現在位置表示を行う際、代表のＧＰＳ受信端末のみがＧＰＳ測位を行い、その測位結果を近距離無線通信で共有することでグループの他のＧＰＳ受信端末がＧＰＳ測位動作を行う必要がなくなり、電力消費が小さく長時間利用可能になるとともに、近距離無線通信の接続状態によってグループ内のＧＰＳ受信端末が近接した位置にあるか離別してしまったかを検出することが可能となり、グループのメンバの一部がグループから離別してしまった際、離別地点を合流地点として経路案内を行うことで携帯電話網の圏外等グループ復帰案内機能を提供することが可能となる。   In the first embodiment described above, when route guidance and current position display are performed by movement in a group, only a representative GPS receiving terminal performs GPS positioning, and the positioning result is shared by short-range wireless communication. This eliminates the need for other GPS receiving terminals in the group to perform GPS positioning operations, reduces power consumption and enables long-term use, and the GPS receiving terminals in the group are close to each other depending on the short-range wireless communication connection status. It is possible to detect whether the group has been separated, and when some members of the group have separated from the group, the route return guidance function is performed by using the separation point as the joining point, and the group return guidance function such as out of service area of the mobile phone network. Can be provided.

本発明のＳＰＳ受信端末は、グループでの山岳歩行やトレッキング等において経路案内や現在位置表示を行う際、代表のＳＰＳ受信端末のみがＳＰＳ測位を行い、その測位結果を近距離無線通信で共有することで、測位精度をそれほど犠牲にせずに、低消費電力化できるＳＰＳ受信端末を提供することができる。また、基地局等の無線による通信網の圏外においても、離れてしまった（はぐれた）ことの判断ができ、例えば、グループのメンバの一部がグループから離別してしまった際のグループへの復帰案内等ができるＳＰＳ受信端末を提供することができる。このため、本発明は、グループで移動等の際、代表となるＧＰＳ受信端末の位置情報を複数のＧＰＳ受信端末で共有する機能と、複数のＧＰＳ受信端末のうちいずれかのＧＰＳ受信端末が離別した際の合流案内を行う機能を持ったＧＰＳ受信端末等、ＧＰＳ測位信号による位置情報をもとに現在位置や目的地までの経路を表示するＧＰＳ受信端末等のＳＰＳ受信端末として有用である。   When the SPS receiving terminal of the present invention performs route guidance or current position display in mountain walking or trekking in a group, only the representative SPS receiving terminal performs SPS positioning and shares the positioning result by short-range wireless communication. Thus, it is possible to provide an SPS receiving terminal capable of reducing power consumption without sacrificing positioning accuracy so much. In addition, it can be determined that the mobile station has been separated (separated) even outside the area of the wireless communication network such as a base station. For example, when a part of a group member is separated from the group, the group is returned to the group. An SPS receiving terminal capable of providing guidance or the like can be provided. For this reason, the present invention separates the function of sharing the position information of a representative GPS receiving terminal among a plurality of GPS receiving terminals when moving in a group, and any one of the plurality of GPS receiving terminals. It is useful as an SPS receiving terminal such as a GPS receiving terminal having a function of performing merging guidance at the time, such as a GPS receiving terminal that displays a current position and a route to a destination based on position information based on a GPS positioning signal.

本発明の実施の形態１におけるＧＰＳ受信端末の構成の一例を示す図The figure which shows an example of a structure of the GPS receiving terminal in Embodiment 1 of this invention. 本発明の実施の形態１におけるグループ化されたＧＰＳ受信端末の通常時の構成および画面表示を示す図The figure which shows the structure at the time of the normal time of the grouped GPS receiving terminal in Embodiment 1 of this invention, and a screen display 本発明の実施の形態１におけるグループ化されたＧＰＳ受信端末のグループ復帰案内時の構成および画面表示を示す図The figure which shows the structure and screen display at the time of group return guidance of the grouped GPS receiving terminal in Embodiment 1 of this invention 本発明の実施の形態１におけるＧＰＳ受信端末の動作を示すフローチャートThe flowchart which shows operation | movement of the GPS receiving terminal in Embodiment 1 of this invention. ＧＰＳ受信端末の初期代表決定処理を示すフローチャートFlow chart showing initial representative determination process of GPS receiving terminal ＧＰＳ受信端末の代表端末通常動作を示すフローチャートFlowchart showing typical operation of representative terminal of GPS receiving terminal ＧＰＳ受信端末の従属端末通常動作を示すフローチャートFlow chart showing normal operation of subordinate terminal of GPS receiving terminal ＧＰＳ受信端末のリンク再接続（代表端末）を示すフローチャートFlow chart showing link reconnection (representative terminal) of GPS receiving terminal ＧＰＳ受信端末のリンク再接続（従属端末）を示すフローチャートFlowchart showing link reconnection (subordinate terminal) of GPS receiving terminal ＧＰＳ受信端末のグループ復帰動作（単独）を示すフローチャートFlow chart showing group return operation (independent) of GPS receiving terminal ＧＰＳ受信端末のグループ復帰動作（代表）を示すフローチャートFlow chart showing group return operation (representative) of GPS receiving terminal ＧＰＳ受信端末のグループ復帰動作（従属）を示すフローチャートFlow chart showing group return operation (subordinate) of GPS receiving terminal

符号の説明Explanation of symbols

１ ＧＰＳ受信端末グループ
５ ＧＰＳ衛星
６ 代表端末近距離無線通信エリア
１００ ＧＰＳ受信端末
１００ａ 代表端末
１００ｂ 従属端末１
１００ｃ 従属端末２
１０１ ＧＰＳ受信部
１０２ 近距離無線送受信部
１０３ 制御部
１０４ 表示部
１０５ 入力部
１０６ リンク監視部
１０７ グループ情報記憶部
１０８ 位置情報記憶部
１０９ 地図情報記憶部
１１０ 測位演算部 DESCRIPTION OF SYMBOLS 1 GPS receiving terminal group 5 GPS satellite 6 Representative terminal near field communication area 100 GPS receiving terminal 100a Representative terminal 100b Dependent terminal 1
100c Subordinate terminal 2
DESCRIPTION OF SYMBOLS 101 GPS receiving part 102 Short-range radio | wireless transmission / reception part 103 Control part 104 Display part 105 Input part 106 Link monitoring part 107 Group information storage part 108 Location information storage part 109 Map information storage part 110 Positioning calculation part

Claims (15)

複数のＳＰＳ受信端末のうちのひとつのＳＰＳ受信端末を代表のＳＰＳ受信端末と定めたＳＰＳ受信端末システムにおいて、
ＳＰＳ信号を受信するＳＰＳ信号受信部と、
ＳＰＳ信号受信部が受信したＳＰＳ信号に基づいて測位演算を行なう測位演算部と、
近距離無線通信により、近距離にある前記代表のＳＰＳ受信端末の行なった測位演算の結果を受信する近距離無線通信部と、
近距離にある前記代表のＳＰＳ受信端末の行なった測位演算の結果を受信できる場合には、前記測位演算部の測位演算を行なわせず、前記代表のＳＰＳ受信端末の行なった測位演算の結果を受信できない場合には、前記測位演算部の測位演算を行なわせる測位演算制御部と、
を備えるＳＰＳ受信端末。 In an SPS receiving terminal system in which one SPS receiving terminal among a plurality of SPS receiving terminals is defined as a representative SPS receiving terminal,
An SPS signal receiver for receiving an SPS signal;
A positioning calculation unit that performs positioning calculation based on the SPS signal received by the SPS signal receiving unit;
A short-range wireless communication unit that receives a result of a positioning calculation performed by the representative SPS receiving terminal at a short distance by short-range wireless communication;
When the result of the positioning calculation performed by the representative SPS receiving terminal at a short distance can be received, the positioning calculation result of the representative SPS receiving terminal is not performed without performing the positioning calculation of the positioning calculating unit. If it is not possible to receive, the positioning calculation control unit for performing the positioning calculation of the positioning calculation unit,
An SPS receiving terminal comprising: 前記近距離無線通信部が近距離無線通信により受信した前記代表のＳＰＳ受信端末からの測位演算の結果の信号の受信品質が所定値以下もしくは通信できなくになった場合に、前記代表のＳＰＳ受信端末から離れてしまったと判断するリンク監視部
を備える請求項１記載のＳＰＳ受信端末。 When the reception quality of the signal as a result of the positioning calculation from the representative SPS receiving terminal received by the short-range wireless communication unit by the short-range wireless communication is less than a predetermined value or communication becomes impossible, the representative SPS reception The SPS receiving terminal according to claim 1, further comprising: a link monitoring unit that determines that the terminal has moved away from the terminal. 前記代表のＳＰＳ受信端末から近距離無線通信を通じて送信された位置情報を記憶する位置情報記憶部を備え、
前記リンク監視部が前記代表のＳＰＳ受信端末から離れてしまったと判断した直前に前記代表のＳＰＳ受信端末から受信し前記位置情報記憶部に記憶された位置を前記代表端末と離別した地点として扱うこと
を特徴とする請求項２記載のＳＰＳ受信端末。 A position information storage unit for storing position information transmitted from the representative SPS receiving terminal through short-range wireless communication;
The location received from the representative SPS receiving terminal and stored in the location information storage unit immediately before it is determined that the link monitoring unit has left the representative SPS receiving terminal is treated as a point separated from the representative terminal. The SPS receiving terminal according to claim 2. 前記代表のＳＰＳ受信端末との間で近距離無線通信を行った際に受信した位置情報に基づき画面表示する
ことを特徴とする請求項３に記載のＳＰＳ受信端末。 The SPS receiving terminal according to claim 3, wherein a screen is displayed based on position information received when short-range wireless communication is performed with the representative SPS receiving terminal. 前記測位演算制御部は、前記代表のＳＰＳ受信端末との近距離無線通信が途絶えた場合に、前記測位演算部の測位演算を行なわせる
ことを特徴とする請求項２乃至請求項４のいずれか１項に記載のＳＰＳ受信端末。 5. The positioning calculation control unit causes the positioning calculation unit to perform a positioning calculation when short-range wireless communication with the representative SPS receiving terminal is interrupted. 2. The SPS receiving terminal according to item 1. 前記近距離無線通信送受信部の電波の出力レベルを変化させることが可能である
ことを特徴とする請求項１乃至請求項５のいずれか１項に記載のＳＰＳ受信端末。 The SPS receiving terminal according to any one of claims 1 to 5, wherein an output level of radio waves of the short-range wireless communication transmitting / receiving unit can be changed. 近距離無線通信のネットワークトポロジーがスター型（マスタ、スレーブによる１対Ｎ通信）である
ことを特徴とする請求項１乃至請求項６のいずれか１項に記載のＳＰＳ受信端末。 The SPS receiving terminal according to any one of claims 1 to 6, wherein the short-range wireless communication network topology is a star type (one-to-N communication by a master and a slave). 近距離無線通信のネットワークトポロジーがピア・トゥー・ピア通信によるメッシュ型である
ことを特徴とする請求項１乃至請求項６のいずれか１項に記載のＳＰＳ受信端末。 The SPS receiving terminal according to any one of claims 1 to 6, wherein the short-range wireless communication network topology is a mesh type based on peer-to-peer communication. 前記近距離無線通信送受信の通信方式がＢ ｌ ｕ ｅ ｔ ｏ ｏ ｔ ｈ、ＺｉｇＢｅｅ、ワイヤレスＬＡＮ、ＵＷＢ、特定省電力無線のいずれかである
ことを特徴とする請求項１乃至請求項８のいずれか１項に記載のＳＰＳ受信端末。 9. The communication method of the short-range wireless communication transmission / reception is any one of Blue oo ot h, ZigBee, wireless LAN, UWB, and a specific power-saving radio. The SPS receiving terminal according to claim 1. 複数のＳＰＳ受信端末のうちのひとつのＳＰＳ受信端末を代表のＳＰＳ受信端末と定めたＳＰＳ受信端末システムにおける測位方法であって、
ＳＰＳ信号を受信するステップと、
受信したＳＰＳ信号に基づいて測位演算を行なうステップと、
近距離無線通信により、近距離にある前記代表のＳＰＳ受信端末の行なった測位演算の結果を受信するステップと、
近距離にある前記代表のＳＰＳ受信端末の行なった測位演算の結果を受信できる場合には、前記測位演算部の測位演算を行なわせず、前記代表のＳＰＳ受信端末の行なった測位演算の結果を受信できない場合には、測位演算を行なわせる測位演算制御ステップと、
を備える測位方法。 A positioning method in an SPS receiving terminal system in which one SPS receiving terminal among a plurality of SPS receiving terminals is defined as a representative SPS receiving terminal,
Receiving an SPS signal;
Performing a positioning operation based on the received SPS signal;
Receiving the result of positioning calculation performed by the representative SPS receiving terminal at a short distance by short-range wireless communication;
When the result of the positioning calculation performed by the representative SPS receiving terminal at a short distance can be received, the positioning calculation result of the representative SPS receiving terminal is not performed without performing the positioning calculation of the positioning calculating unit. If not received, positioning calculation control step for performing positioning calculation,
A positioning method comprising: 請求項２乃至請求項５のいずれか１項に記載のＧＰＳ受信端末が複数ある環境下における代表端末となるＧＰＳ受信端末を最初に決定する代表端末初期決定方法として、複数のＧＰＳ受信端末のうち、近距離無線通信での共通のＩＤとなるグループＩＤを最初に設定し近距離無線通信を開始したＧＰＳ受信端末を代表端末とする
ことを特徴とする代表端末初期決定方法。 A representative terminal initial determination method for initially determining a GPS receiving terminal to be a representative terminal in an environment having a plurality of GPS receiving terminals according to any one of claims 2 to 5, of a plurality of GPS receiving terminals A representative terminal initial determination method, wherein a GPS receiving terminal that first sets a group ID that is a common ID in short-range wireless communication and starts short-range wireless communication is used as the representative terminal. 請求項３乃至請求項６のいずれか１項に記載のＧＰＳ受信端末が複数ある環境下における代表端末となるＧＰＳ受信端末の決定方法として、各々のＧＰＳ受信端末から近距離無線通信で接続可能なＧＰＳ受信端末数の大小によって決定する
ことを特徴とする代表端末決定方法。 A method of determining a GPS receiving terminal that is a representative terminal in an environment having a plurality of GPS receiving terminals according to any one of claims 3 to 6, wherein each GPS receiving terminal can be connected by short-range wireless communication. A representative terminal determination method, wherein the number is determined according to the number of GPS receiving terminals. 請求項３乃至請求項７のいずれか１項に記載のＧＰＳ受信端末が複数ある環境下における代表端末となるＧＰＳ受信端末の決定方法として、各々のＧＰＳ受信端末から近距離無線通信でＧＰＳ受信端末数と通信する際の近距離無線通信の信号品質によって決定する
ことを特徴とする代表端末決定方法。 A method of determining a GPS receiving terminal to be a representative terminal in an environment having a plurality of GPS receiving terminals according to any one of claims 3 to 7, wherein a GPS receiving terminal is connected by short-range wireless communication from each GPS receiving terminal. A method for determining a representative terminal, comprising: determining a signal quality of short-range wireless communication when communicating with a number. 請求項３乃至請求項８のいずれか１項に記載のＧＰＳ受信端末が複数ある環境下における代表端末となるＧＰＳ受信端末の決定方法として、一定期間の経過で代表端末は従属端末へと変更され、従属端末のうちの１台が代表端末へと変更される
ことを特徴とする代表端末決定方法。 As a method for determining a GPS receiving terminal to be a representative terminal in an environment having a plurality of GPS receiving terminals according to any one of claims 3 to 8, the representative terminal is changed to a subordinate terminal after a certain period of time. One of the subordinate terminals is changed to a representative terminal. 請求項３乃至請求項９のいずれか１項に記載のＧＰＳ受信端末が複数ある環境下における代表端末となるＧＰＳ受信端末の決定方法として、いずれかの従属端末が代表端末と接続できなくなった際に、その従属端末が代表端末となる
ことを特徴とする代表端末決定方法。 A method of determining a GPS receiving terminal to be a representative terminal in an environment having a plurality of GPS receiving terminals according to any one of claims 3 to 9, wherein any subordinate terminal cannot connect to the representative terminal In addition, the representative terminal determining method, wherein the subordinate terminal becomes the representative terminal.
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