PROBLEM TO BE SOLVED: To suppress an increase in a circuit scale in an authentication system while preventing erroneous determination of a position of a portable device and suppressing power consumption.SOLUTION: An LF transmission unit 31 of an authentication system includes an outdoor antenna driver 315a that transmits regular transmission data on a carrier wave from an outdoor antenna 32a so as to be able to determine whether a mobile terminal is located inside or outside a passenger compartment and an indoor antenna driver 315b that transmits transmission data for invalidation which is binary data having the same value as a value of a bit string of the regular transmission data before switching on a carrier wave from an indoor antenna 32b by specified time shorter than bit time immediately after the value of the bit string of the regular transmission data to be transmitted from the outdoor antenna 32a is switched.SELECTED DRAWING: Figure 4
【課題】認証システムにおいて、回路規模の増大を抑えることを可能にしながらも、電力消費を抑えつつ、携帯機の位置が誤判定されないようにする。【解決手段】認証システムのLF送信部31が、車室内外のいずれに携帯機が位置するかを識別可能とするために、室外アンテナ32aから、正規送信データを搬送波にのせて送信させる室外アンテナドライバ315aと、室外アンテナ32aから送信させる正規送信データのビット列の値が切り替わった直後に、ビット時間より短い規定時間だけ、室内アンテナ32bから、切り替わり前のその正規送信データのビット列の値と同じ値のバイナリデータである無効化用送信データを搬送波にのせて送信させる室内アンテナドライバ315bとを備える。【選択図】図4
MODULATED WAVE TRANSMISSION DEVICE
変調波送信装置
2018-09-27
Patent
Electronic Resource
Japanese
IPC: | H04B TRANSMISSION , Übertragung / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / H04L TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION , Übertragung digitaler Information, z.B. Telegrafieverkehr |
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