LOCATION DETECTION SYSTEM, LOCATION DETECTION DEVICE, WIRELESS TERMINAL AND APPROCH DETERMINATION METHOD

PROBLEM TO BE SOLVED: To prevent collisions and contact accidents in airports, harbors, road surfaces and the like.SOLUTION: A location detection system 1 is the location detection system that includes: a wireless terminal 12; and a location detection device 11. The location detection device 11 includes: a correction observation information creation unit 112 that creates correction observation information, using a GNSS; and an interrogator 113 that transmits the correction observation information and a question signal asking the wireless terminal 12 for location information and identification information. The wireless terminal 12 includes: a GNSS positioning unit 121 that calculates location information on an own device, using the GNSS; a transponder 122 that responds to the question signal to transmit a response signal including location information having the location information modified based on the correction observation information and the identification information, and receives a response signal from other wireless terminal; and an approach determination unit 124 that determines movement toward the other wireless terminal on the basis of the location information on the own device, the identification information and the location information to be included in the response signal from the other wireless terminal.SELECTED DRAWING: Figure 1 【課題】空港・港湾・路面等での衝突・接触事故を防止する。【解決手段】位置検出システム１は、無線端末１２と位置検出装置１１を有する位置検出システムであって、位置検出装置１１は、ＧＮＳＳを利用して補正観測情報を生成する補正観測情報生成部１１２と、補正観測情報と無線端末１２に位置情報及び識別情報を質問する質問信号を送信するインテロゲータ１１３と、を有し、無線端末１２は、ＧＮＳＳを利用して自装置の位置情報を算出するＧＮＳＳ測位部１２１と、質問信号に応じ位置情報を補正観測情報に基づいて修正した位置情報と識別情報を含む応答信号を送信するとともに他の無線端末からの応答信号を受信するトランスポンダ１２２と、自装置の位置情報及び他の無線端末からの応答信号に含まれる識別情報及び位置情報に基づいて他の無線端末との接近を判断する接近判断部１２４と、を有する。【選択図】 図１