POSITION ESTIMATING DEVICE AND POSITION ESTIMATING METHOD

• Main Authors: YAMAMURA RYUSUKE, MATSUSHIMA SADAHISA, OTANI EISUKE, NAMIKI HAJIME, KOBAYASHI HIROYUKI, FUJISHIMA YUTO
• Format: Patent
• Language: English; Japanese
• Published: 08.10.2020
• 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 provide a position estimating device which heightens the separability of a plurality of targets by an FFT process and heightens the accuracy of distance estimation by a 2-frequency comparison process.SOLUTION: A position estimating device 100 comprises: transmit units 110, 111 for transmitting a signal wave changed to two frequencies with a prescribed frequency difference; a receive unit 121 for receiving a reflected wave of the signal wave having been reflected by a plurality of targets and generating a beat signal derived by frequency-converting the reflected wave with the frequency of the signal wave; a first signal processing unit 125 for generating, for each of beat signals corresponding to two frequencies, separate beat signals with which phase information is retained and the azimuth angles or distances of the plurality of targets are separated from each other; and a second signal processing unit 126 for estimating the distance to a target as the position of the target from a prescribed frequency difference and a phase difference of separate beat signals corresponding to two frequencies.SELECTED DRAWING: Figure 1 【課題】ＦＦＴ処理による複数のターゲットの分離能を高め、２周波比較処理による距離推定精度を高める位置推定装置を提供する。【解決手段】位置推定装置１００は、所定の周波数差で２つの周波数に変化させた信号波を送信する送信部１１０，１１１と、信号波が複数のターゲットによって反射された反射波を受信し、反射波を信号波の周波数で周波数変換したビート信号を生成する受信部１２１と、２つの周波数に対応するビート信号の各々に対して、位相情報が保たれた、前記複数のターゲットの方位角度または距離が互いに分離された分離ビート信号を生成する第１信号処理部１２５と、所定の周波数差、および２つの周波数に対応する分離ビート信号の位相差から、ターゲットの位置としてターゲットとの距離を推定する第２信号処理部１２６とを備える。【選択図】図１