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A platform for research: civil engineering, architecture and urbanism
RADIO WAVE PROPAGATION DISTANCE ESTIMATION DEVICE
PROBLEM TO BE SOLVED: To provide a radio wave propagation distance estimation device capable of improving distance estimation precision.SOLUTION: A distance measurement signal obtained by compositing N sinusoidal waves having different frequencies is transmitted by radio from on-vehicle equipment 2 to a portable machine 3, the portable machine 3 returns the signal as it is, and the on-vehicle equipment 2 receives the distance measurement signal. The amount of phase rotation generated between a distance measurement signal being currently transmitted by the on-vehicle equipment 2 and a distance measurement signal received by the on-vehicle equipment 2 is obtained for each frequency, and further a difference in the amount of phase rotation in adjacent frequencies is obtained. An inclination in a relationship between frequencies and the amount of phase rotation shows delay time of the distance measurement signal, thus calculating propagation distance by multiplying the delay time by heretofore known light velocity and estimating distance from the on-vehicle equipment 2 to the portable machine 3 are possible. By using a plurality of antennas (equivalent to the on-vehicle equipment 2), and selecting a center value of a plurality of propagation distances calculated from each reception signal as a distance measurement value, precision of distance estimation is improved.SELECTED DRAWING: Figure 1
【課題】距離推定精度の向上を可能にした電波伝搬距離推定装置を提供すること。【解決手段】周波数の異なるＮ個のサイン波を合成した測距信号を車載器２から携帯機３に無線で送信し、携帯機３はこれをそのまま送り返し、車載器２はその測距信号を受信する。車載器２が現在送信している測距信号と、車載器２が受信した測距信号との間に生じている位相回転量を周波数毎に求め、さらに隣り合う周波数における位相回転量の差を求める。周波数と位相回転量との関係における傾きが測距信号の遅延時間を示すため、遅延時間に公知の光速を乗じることで伝搬距離を算出しつつ、車載器２から携帯機３までの距離を推定することが可能となる。複数のアンテナ（車載器２に相当）を用い、それぞれの受信信号から算出される複数の伝搬距離の中央値を測距値として選択することで、距離推定の精度を高める。【選択図】図１
RADIO WAVE PROPAGATION DISTANCE ESTIMATION DEVICE
PROBLEM TO BE SOLVED: To provide a radio wave propagation distance estimation device capable of improving distance estimation precision.SOLUTION: A distance measurement signal obtained by compositing N sinusoidal waves having different frequencies is transmitted by radio from on-vehicle equipment 2 to a portable machine 3, the portable machine 3 returns the signal as it is, and the on-vehicle equipment 2 receives the distance measurement signal. The amount of phase rotation generated between a distance measurement signal being currently transmitted by the on-vehicle equipment 2 and a distance measurement signal received by the on-vehicle equipment 2 is obtained for each frequency, and further a difference in the amount of phase rotation in adjacent frequencies is obtained. An inclination in a relationship between frequencies and the amount of phase rotation shows delay time of the distance measurement signal, thus calculating propagation distance by multiplying the delay time by heretofore known light velocity and estimating distance from the on-vehicle equipment 2 to the portable machine 3 are possible. By using a plurality of antennas (equivalent to the on-vehicle equipment 2), and selecting a center value of a plurality of propagation distances calculated from each reception signal as a distance measurement value, precision of distance estimation is improved.SELECTED DRAWING: Figure 1
【課題】距離推定精度の向上を可能にした電波伝搬距離推定装置を提供すること。【解決手段】周波数の異なるＮ個のサイン波を合成した測距信号を車載器２から携帯機３に無線で送信し、携帯機３はこれをそのまま送り返し、車載器２はその測距信号を受信する。車載器２が現在送信している測距信号と、車載器２が受信した測距信号との間に生じている位相回転量を周波数毎に求め、さらに隣り合う周波数における位相回転量の差を求める。周波数と位相回転量との関係における傾きが測距信号の遅延時間を示すため、遅延時間に公知の光速を乗じることで伝搬距離を算出しつつ、車載器２から携帯機３までの距離を推定することが可能となる。複数のアンテナ（車載器２に相当）を用い、それぞれの受信信号から算出される複数の伝搬距離の中央値を測距値として選択することで、距離推定の精度を高める。【選択図】図１
RADIO WAVE PROPAGATION DISTANCE ESTIMATION DEVICE
電波伝搬距離推定装置
KOGA KENICHI (author) / IMAI TOMOMI (author) / IWASHITA AKITOSHI (author) / KIKUMA NOBUYOSHI (author)
2018-08-09
Patent
Electronic Resource
Japanese
IPC:
G01S
RADIO DIRECTION-FINDING
,
Funkpeilung
/
B60R
Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen
,
VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
/
E05B
LOCKS
,
Schlösser
/
H03J
TUNING RESONANT CIRCUITS
,
Abstimmen von Resonanzkreisen [Tuner]
/
H04B
TRANSMISSION
,
Übertragung
/
H04Q
Wähltechnik
,
SELECTING