POSITION ESTIMATION METHOD, POSITION ESTIMATION SYSTEM, POSITION ESTIMATION SERVER, AND POSITION ESTIMATION PROGRAM

• Main Authors: SAKAMOTO HIROSHI, HOSODA MASAMICHI, MORI TADASHI, OGAWA TOMOAKI, MIYAMOTO MASARU, MURAKAMI TOMOKI
• Format: Patent
• Language: English; Japanese
• Published: 20.08.2020
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; TESTING

To estimate the position of a wireless terminal station with good accuracy using RTT and/or RSSI.SOLUTION: Provided is a position estimation method for transmitting/receiving a measurement signal and a response signal between a wireless station 10 equipped with a plurality of n known antennas 11 installed at mutually different known positions and a wireless terminal station 20 equipped with a terminal antenna 21, measuring an RTT that is a reciprocal delay time of the above and an RSSI that is a received radio wave strength of the above, and estimating the position of the wireless terminal station. With this method, a solution obtained by simultaneously satisfying an RTT evaluation function ffor evaluating the estimated value of position of the wireless terminal station that is estimated from the RTT measured between the known antennas i (i=1, 2, through n) and an RSSI evaluation function ffor evaluating the estimated value of position of the wireless terminal station that is estimated from the RSSI, or an estimated value searched for so that a combined error evaluation function fof the RTT and RSSI evaluation functions becomes minimum is obtained as the position of the wireless terminal station.SELECTED DRAWING: Figure 1 【課題】ＲＴＴまたは／およびＲＳＳＩを用いて無線端末局の位置を精度よく推定する。【解決手段】互いに異なる既知の位置に設置された複数ｎ個の既知アンテナ１１を備える無線局１０と、端末アンテナ２１を備える無線端末局２０との間で測定信号と応答信号を送受信し、その往復遅延時間であるＲＴＴおよびその受信電波強度であるＲＳＳＩを測定して無線端末局の位置を推定する位置推定方法において、既知アンテナｉ（ｉ＝１，２，...，ｎ）との間で測定されるＲＴＴから推定される無線端末局の位置の推定値を評価するＲＴＴ評価関数ｆtiと、ＲＳＳＩから推定される無線端末局の位置の推定値を評価するＲＳＳＩ評価関数ｆriとを連立させることにより得られる解、もしくはＲＴＴ評価関数とＲＳＳＩ評価関数を組み合わせた誤差評価関数ｆerrorが最小になるように推定値を探索した値を無線端末局の位置として求める。【選択図】図１