PORTABLE DEVICE POSITION ESTIMATION SYSTEM

• Main Authors: TAKASUKA NAOHITO, SAKAMOTO KOJI
• Format: Patent
• Language: English; Japanese
• Published: 09.09.2021
• Subjects: ACCESSORIES THEREFOR; ANALOGOUS ARRANGEMENTS USING OTHER WAVES; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; FIXED CONSTRUCTIONS; HANDCUFFS; KEYS; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; LOCKS; MEASURING; PERFORMING OPERATIONS; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; SAFES; TESTING; TRANSPORTING; VEHICLES IN GENERAL; VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISEPROVIDED FOR; WINDOW OR DOOR FITTINGS

To provide a portable device position estimation system capable of improving the position estimation accuracy of a portable device communicating with an on-vehicle device.SOLUTION: An electronic key position estimation system 10 corrects the influence of the magnetic field generated in a structure of a vehicle 11 by the radio wave from the LF antenna 181 on the received signal strength. Specifically, RSSI value is corrected using the maximum difference having the largest value among the differences between the first reception strength and the second reception strength. Thus, in consideration of the influence of the magnetic field on the received signal strength, a position estimation unit can estimate the position where the electron key 200 exists. Therefore, the position estimation accuracy of the electronic key 200 can be improved.SELECTED DRAWING: Figure 1 【課題】車載装置と通信する携帯機において、携帯機の位置推定精度を向上することができる携帯機位置推定システムを提供する。【解決手段】電子キー位置推定システム１０は、ＬＦアンテナ１８１からの電波によって車両１１の構造に発生する磁場による受信信号強度への影響を補正する。具体的には、第１受信強度と第２受信強度との差分の内、最も値が大きい最大差分を用いてＲＳＳＩ値を補正する。これによって磁場が受信信号強度に与える影響を考慮して、位置推定部は電子キー２００が存在する位置を推定することができる。したがって電子キー２００の位置推定精度を向上することができる。【選択図】図１