PROBLEM TO BE SOLVED: To provide a delay time estimation apparatus capable of improving an estimation accuracy of a delay time.SOLUTION: When measuring a delay time at transmission and reception of a radio wave, time (data holding time t1) required for replying a reply radio wave Sb after a transmission radio wave Sa was received in a terminal is changed by a specified time Δt, and the reply radio wave Sb is transmitted to a communication master at a data holding time t2. A value obtained by adding the specified time Δt to a delay time (a first delay time Ts1) obtained under a condition that the transmission of the reply radio wave Sb is not changed by the specified time Δt is set to a positive value Tk. A clock error is calculated by obtaining that how the delay time (a second delay time Ts2) obtained under the condition that the transmission of reply radio wave Sb is changed by the specified time Δt is deviated to the positive value Tk.SELECTED DRAWING: Figure 3

    【課題】遅延時間の推定の精度を向上することができる遅延時間推定装置を提供する。【解決手段】電波送受信時の遅延時間を測定するにあたり、端末で送信電波Saを受信してから返信電波Sbを返信するまでに要する時間(データ保持時間t1)を、規定時間Δt、変化させ、返信電波Sbをデータ保持時間t2で通信マスタに送信する。そして、返信電波Sbの送信を規定時間Δt変化させない状態下で求めた遅延時間(第1遅延時間「Ts1」)に規定時間Δtを加算した値を正値Tkとし、返信電波Sbの送信を規定時間Δt変化させた状態下で求めた遅延時間(第2遅延時間「Ts2」)が正値Tkに対してどれだけずれているかを求めて、クロック誤差を算出する。【選択図】図3


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    Title :

    DELAY TIME ESTIMATION APPARATUS


    Additional title:

    遅延時間推定装置


    Contributors:

    Publication date :

    2017-06-29


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    H04B TRANSMISSION , Übertragung / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / E05B LOCKS , Schlösser



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