WO2016056383A1 - Dispositif de détection de position - Google Patents

Dispositif de détection de position Download PDF

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Publication number
WO2016056383A1
WO2016056383A1 PCT/JP2015/076724 JP2015076724W WO2016056383A1 WO 2016056383 A1 WO2016056383 A1 WO 2016056383A1 JP 2015076724 W JP2015076724 W JP 2015076724W WO 2016056383 A1 WO2016056383 A1 WO 2016056383A1
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Prior art keywords
distance
reception
receiving
transmitter
received power
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PCT/JP2015/076724
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English (en)
Japanese (ja)
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井上　学
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株式会社村田製作所
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Publication of WO2016056383A1 publication Critical patent/WO2016056383A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
    • G01S5/14—Determining absolute distances from a plurality of spaced points of known location
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
    • G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
    • G01S11/06—Systems for determining distance or velocity not using reflection or reradiation using radio waves using intensity measurements

Definitions

  • the present invention relates to a position detection device that receives radio waves radiated from a transmitter and detects the position of the transmitter.
  • Patent Documents 1 and 2 disclose techniques for receiving radio waves radiated from a transmitter and detecting the position of the transmitter based on the intensity of a received signal.
  • radio waves transmitted by a slave attached to a moving body are received by three base stations.
  • the distance from each base station to the handset is calculated from the radio field intensity received at each base station.
  • the position of the slave unit can be specified based on the distance from each of the three base stations to the slave unit.
  • the distance from the receiving device to the transmitter is calculated based on the radio wave intensity received by the plurality of receiving devices. Based on this distance, the position of the transmitter is detected. At this time, the environment variables of the transmitter and the receiver are defined, and the distance is corrected using the environment variables.
  • the environment variable of the transmitter is an index of how much the sensitivity changes when the transmitter is placed in an ideal state.
  • the environment variable of the receiving device is an index of how much the sensitivity changes when the receiving device is placed in an ideal state.
  • the radio field intensity received by the receiving device is generally affected by multipath.
  • the influence of multipath is not considered. For this reason, when affected by multipath, the accuracy of the calculation result of the distance from the base station to the slave unit is lowered.
  • the influence of an indirect wave is taken into account by introducing an environmental coefficient into the calculation of the distance from the receiving device to the transmitter.
  • An object of the present invention is to provide a position detection device capable of improving the calculation accuracy of the distance from the receiving device to the transmitter in consideration of multipath of radio waves.
  • a position detection device provides: A transmitter disposed above a reflecting surface for reflecting radio waves and emitting radio waves of a first frequency; Including at least two receiving antennas arranged at the same position in the in-plane direction of the reflecting surface and at different positions in the height direction, and receiving the radio waves of the first frequency radiated from the transmitter by the receiving antenna. 1 receiving device; A first distance in the in-plane direction of the reflecting surface from the receiving antenna to the transmitter based on the reception intensity of the radio wave of the first frequency received by the receiving antenna of the first receiving device. And a processing device for calculating.
  • the path length difference between the direct wave and the indirect wave is different for each receiving antenna. For this reason, the reception intensity obtained in consideration of the influence of multipath has different change characteristics with respect to the distance from the transmitter to the reception antenna.
  • the distance estimation accuracy can be increased by obtaining the distance using a plurality of reception intensities having different change characteristics with respect to the distance.
  • the processing device calculates the first distance based on a difference in reception intensity of radio waves received by the reception antenna.
  • the difference in reception strength has a region that varies greatly with changes in distance compared to the original reception strength. By using this area to obtain the distance from the transmitter to the receiving antenna, the distance estimation accuracy can be improved.
  • the transmitter emits a radio wave of a second frequency different from the first frequency in addition to the radio wave of the first frequency;
  • the first reception device receives the second frequency radio wave with the reception antenna,
  • the processing device performs the first based on the reception intensity of the radio wave of the second frequency. The distance is calculated.
  • the receiving antenna of the first receiving device receives a direct wave from the transmitter and an indirect wave reflected by the reflecting surface.
  • the position detection device includes the position detection device according to the first to fourth aspects, Including two receiving antennas arranged at the same position in the in-plane direction of the reflecting surface and at different positions in the height direction, and receiving the radio waves of the first frequency radiated from the transmitter by the two receiving antennas.
  • a second receiving device Including two receiving antennas arranged at the same position in the in-plane direction of the reflecting surface and at different positions in the height direction, and receiving the radio waves of the first frequency radiated from the transmitter by the two receiving antennas.
  • a third receiving device The reception antennas of the first reception device, the second reception device, and the third reception device are arranged at positions that do not line up in a straight line with respect to the in-plane direction of the reflection surface
  • the processor is Based on the reception strength of the radio waves of the first frequency received by the two reception antennas of the second reception device, the two reception antennas of the second reception device to the transmitter, Calculate a second distance for the in-plane direction of the reflecting surface; Based on the reception strength of the radio waves of the first frequency received by the two receiving antennas of the third receiving device, the two receiving antennas of the third receiving device to the transmitter, Calculate a third distance in the in-plane direction of the reflecting surface; The position of the two receiving antennas of each of the first receiving device, the second receiving device, and the third receiving device with respect to the in-plane direction of the reflecting surface, the first distance, and the second Based on the distance and the third distance, the position of the transmitter is calculated.
  • the path length difference between the direct wave and the indirect wave is different for each receiving antenna. For this reason, the reception intensity obtained in consideration of the influence of multipath has different change characteristics with respect to the distance from the transmitter to the reception antenna.
  • the distance estimation accuracy can be increased by obtaining the distance using a plurality of reception intensities having different change characteristics with respect to the distance.
  • FIG. 1 is a schematic diagram of a position detection apparatus according to the first embodiment.
  • FIG. 2A is a block diagram of a processing device used in the position detection device according to the first embodiment.
  • An example of the first received power-distance correspondence table and the second received power-distance correspondence table is shown in a graph format. It is the shown graph.
  • FIG. 3A is a block diagram of a processing device of the position detection device according to the second embodiment
  • FIG. 3B is a graph illustrating an example of a first received power difference-distance correspondence table in a graph format.
  • FIG. 4 is a schematic diagram of a position detection apparatus according to the third embodiment.
  • FIG. 5A is a block diagram of the processing device of the position detection device according to the third embodiment, and FIG.
  • FIG. 5B is an example of a third received power-distance correspondence table and a fourth received power-distance correspondence table in a graph format. It is a graph to show.
  • FIG. 6A is a block diagram of the processing device of the position detection device according to the fourth embodiment
  • FIG. 6B is a graph illustrating an example of the first received power difference-distance correspondence table and the second received power difference-distance correspondence table. It is a graph shown in a format.
  • FIG. 7 is a diagram illustrating an example of a planar arrangement of reception antennas of a reception device included in the position detection device according to the fifth embodiment.
  • FIG. 8 is a schematic diagram of a position detection apparatus according to the sixth embodiment.
  • FIG. 1 shows a schematic diagram of a position detection apparatus according to the first embodiment.
  • a transmitter 15 is disposed above the reflecting surface 10 that reflects radio waves.
  • the transmitter 15 radiates radio waves having a frequency f1.
  • the reflective surface 10 is a floor surface of a store, for example, and the transmitter 15 is attached to the shopping cart 16.
  • the transmitter 15 may be attached to the waist of a person who moves on the floor of the gymnasium.
  • the first receiving antenna 21 ⁇ / b> A and the second receiving antenna 21 ⁇ / b> B of the receiving device 20 are arranged above the reflecting surface 10.
  • the first receiving antenna 21A and the second receiving antenna 21B are arranged at the same antenna installation position 13 with respect to the in-plane direction of the reflecting surface 10, and are arranged at different positions with respect to the height direction. Heights from the reflecting surface 10 to the first receiving antenna 21A and the second receiving antenna 21B are represented by H1 and H2, respectively.
  • the first receiving antenna 21 ⁇ / b> A and the second receiving antenna 21 ⁇ / b> B are configured to receive a radio wave having a frequency f ⁇ b> 1 radiated from the transmitter 15.
  • the reception device 20 transmits signals indicating the first reception power PA1 and the second reception power PB1 of the radio wave having the frequency f1 received by the first reception antenna 21A and the second reception antenna 21B to the processing device 30, respectively.
  • the signal indicating the first received power PA1 and the second received power PB1 is, for example, a voltage signal, and the voltage value represents the received power.
  • the processing device 30 calculates the distance D in the in-plane direction of the reflecting surface 10 from the antenna installation position 13 to the transmitter 15 based on the first received power PA1 and the second received power PB1.
  • the correspondence table between the received power and the distance stored in the memory 31 is referred to.
  • the processing executed by the processing device 30 will be described in detail with reference to FIGS. 2A and 2B.
  • FIG. 2A shows a block diagram of the processing device 30.
  • the processing device 30 includes a distance calculation unit 35 and a distance selection unit 36.
  • the memory 31 (FIG. 1) stores a first received power-distance correspondence table 32A and a second received power-distance correspondence table 32B.
  • This correspondence table may be created by simulation, or may be created by actual measurement in an actual environment.
  • FIG. 2B shows an example of the first received power-distance correspondence table 32A and the second received power-distance correspondence table 32B in a graph format.
  • the horizontal axis represents the distance D from the antenna installation position 13 to the transmitter 15 in the unit “m”, and the vertical axis represents the received power in the unit “dBm”.
  • the solid line in FIG. 2B indicates the first received power PA1 by the first receiving antenna 21A, and the broken line indicates the second received power PB1 by the second receiving antenna 21B.
  • the height H1 of the first receiving antenna 21A is 0.5 m
  • the height H2 of the second receiving antenna 21B is 3.0 m.
  • the frequency of the radio wave radiated from the transmitter 15 is 172 MHz.
  • direct waves from the transmitter 15 to the first receiving antenna 21A and the second receiving antenna 21B and indirect waves reflected by the reflecting surface 10 are considered.
  • the reflectance of the reflecting surface 10 was assumed to be 100%. It is assumed that the intensity of the radio wave passing through the propagation path other than the direct wave and the indirect wave reflected by the reflecting surface 10 is small enough to be ignored.
  • the first received power PA1 monotonously decreases with increasing distance D.
  • the second received power PB1 increases as the distance D increases, and exhibits a maximum value when the distance D is about 5 m. In the range where the distance D is 5 m or more, the second received power PB1 monotonously decreases as the distance D increases.
  • the reason why the two fluctuation characteristics with respect to the distance D are different is that the indirect wave reflected by the reflecting surface 10 is taken into consideration.
  • the distance calculation unit 35 executes a first distance calculation process 35A and a second distance calculation process 35B.
  • the first candidate value D1 is obtained by applying the first received power PA1 to the first received power-distance correspondence table 32A.
  • the second candidate value D2 is obtained by applying the second received power PB1 to the second received power-distance correspondence table 32B.
  • the first received power PA1 is about ⁇ 74 dBm and the second received power PB1 is about ⁇ 83 dBm.
  • the first distance calculation process 35A about 3.5 m is obtained as the first candidate value D1.
  • the second distance calculation process 35B two values of about 3.5 m and about 10 m are obtained as the second candidate value D2.
  • the distance selection unit 36 selects the most probable candidate value as the estimated value of the distance D from the first candidate value D1 and the second candidate value D2.
  • the value of about 10 m obtained as the second candidate value D2 is excluded from the candidates for the distance D, and about 3 obtained with both the first candidate value D1 and the second candidate value D2.
  • a value of .5 m is selected as an estimate of the distance D.
  • the distance D cannot be uniquely determined from the second received power PB1.
  • the estimated value of the distance D can be narrowed down to one value.
  • the second received power PB1 determines one value from the range of 0 m to 5 m as the second candidate value D2, and further increases the value from within the range of 5 m or more. One value is obtained.
  • the first received power PA1 By using the first received power PA1 in combination, one of the two values of the second candidate value D2 can be excluded from the distance D candidates.
  • the absolute value of the slope of the second received power PB1 is larger than the absolute value of the slope of the first received power PA1. Accordingly, when the first candidate value D1 obtained from the first received power PA1 is in the range of 0 m to 3 m, the second candidate value D2 obtained from the second received power PB1 is adopted as the distance D, The accuracy of the distance D can be increased.
  • the difference is different from the path length difference between the direct wave and the indirect wave from the transmitter 15 to the second receiving antenna 21B.
  • the change characteristics with respect to the distance D of the first received power PA1 and the second received power PB1 are different.
  • Example 2 Next, Example 2 will be described with reference to FIGS. 3A and 3B. Hereinafter, differences from the first embodiment will be described, and description of the same configuration will be omitted.
  • FIG. 3A shows a block diagram of the processing device 30 (FIG. 1) of the position detection device according to the second embodiment.
  • the processing device 30 includes a received power difference calculation unit 37 and a distance calculation unit 38.
  • a first received power difference-distance correspondence table 33 is stored in the memory 31 (FIG. 1).
  • FIG. 3B shows an example of the first received power difference-distance correspondence table 33 in a graph format.
  • the horizontal axis represents the distance D from the antenna installation position 13 to the transmitter 15 (FIG. 1) in the unit “m”, and the vertical axis represents the reception power difference in the unit “dBm”.
  • the solid line in FIG. 3B indicates the difference PA1-PB1 between the first received power PA1 and the second received power PB1 shown in FIG. 2B.
  • the received power difference calculation unit 37 shown in FIG. 3A calculates a difference PA1-PB1 between the first received power PA1 and the second received power PB1.
  • the distance calculation unit 38 obtains the distance D by applying the received power difference PA1-PB1 to the first received power difference-distance correspondence table 33.
  • the received power difference PA1-PB1 is 9 dBm.
  • the distance D is found to be about 3.5 m.
  • the slope of the received power difference PA1-PB1 is within the range of 0 m to 5 m. It can be seen that the slope of the received power PA1 is greater than 1. Therefore, when the distance D is in the range of 0 m to 5 m, it is possible to increase the estimation accuracy of the distance D by using the received power difference PA1-PB1 rather than using the first received power PA1.
  • Example 3 Next, a distance detection apparatus according to the third embodiment will be described with reference to FIGS. 4 and 5A to 5B. Hereinafter, differences from the first embodiment will be described, and description of the same configuration will be omitted.
  • FIG. 4 shows a schematic diagram of a position detection apparatus according to the third embodiment.
  • the transmitter 15 radiates a radio wave having a frequency f2 different from the frequency f1 in addition to the radio wave having the frequency f1.
  • the first receiving antenna 21A and the second receiving antenna 21B are configured to receive a radio wave having a frequency f1 and a radio wave having a frequency f2.
  • the frequency f1 is the same as the frequency of the radio wave radiated from the transmitter 15 (FIG. 1) of the first embodiment, and is 172 MHz, for example.
  • the frequency f2 is 304.52 MHz, for example.
  • the receiving device 20 includes a first received power PA1 of a radio wave having a frequency f1 received by the first receiving antenna 21A, a second received power PB1 of a radio wave having a frequency f1 received by the second receiving antenna 21B, The third reception power PA2 of the radio wave of frequency f2 received by the first reception antenna 21A and the fourth reception power PB2 of the radio wave of frequency f2 received by the second reception antenna 21B are output.
  • the first received power PA1, the second received power PB1, the third received power PA2, and the fourth received power PB2 are input to the processing device 30.
  • FIG. 5A shows a block diagram of the processing device 30 (FIG. 4) of the position detection device according to the third embodiment.
  • the processing device 30 includes a distance calculation unit 35 and a distance selection unit 36.
  • the distance calculation unit 35 executes a first distance calculation process 35A and a second distance calculation process 35B as in the first embodiment illustrated in FIG. 2A. Furthermore, the distance calculation unit 35 executes a third distance calculation process 35C and a fourth distance calculation process 35D.
  • the memory 31 (FIG. 4) stores a first received power-distance correspondence table 32A and a second received power-distance correspondence table 32B. Further, a third received power-distance correspondence table 32C and a fourth received power-distance correspondence table 32D are stored.
  • FIG. 5B shows an example of the third received power-distance correspondence table 32C and the fourth received power-distance correspondence table 32D in a graph format.
  • the horizontal axis represents the distance D from the antenna installation position 13 to the transmitter 15 (FIG. 4) in the unit “m”, and the vertical axis represents the received power in the unit “dBm”.
  • the solid line in FIG. 5B indicates the third received power PA2, and the broken line indicates the fourth received power PB2.
  • the direct wave from the transmitter 15 to the first receiving antenna 21A and the second receiving antenna 21B and the indirect wave reflected by the reflecting surface 10 The effects of are taken into account.
  • the fourth received power PB2 a null point appears near the distance D of about 4 m. That is, the difference in path length between the direct wave and the indirect wave from the transmitter 15 to the second receiving antenna 21B corresponds to a phase difference of 180 degrees.
  • the first candidate value D1 and the second candidate value D2 are obtained in the same manner as in the first embodiment.
  • the third candidate value D3 is obtained by applying the third received power PA2 to the third received power-distance correspondence table 32C in the third distance calculation process 35C.
  • the fourth candidate value D4 is obtained by applying the fourth received power PB2 to the fourth received power-distance correspondence table 32D.
  • the distance selection unit 36 selects the most probable candidate value as the estimated value of the distance D from the first candidate value D1 to the fourth candidate value D4. For example, when the received power is a value in the vicinity of the null point, the S / N ratio of the received power is lowered, so that the accuracy of the estimated value of the distance D obtained from the received power is lowered. Therefore, when the magnitude of the received power is in the vicinity of the null point, it is preferable to exclude the received power when estimating the distance D. In the example shown in FIG.
  • the first candidate value D4 obtained from the fourth received power PB2 is excluded, and the first An estimated value of the distance D may be obtained from the candidate value D1, the second candidate value D2, and the third candidate value D3.
  • an estimate of the distance D can be obtained by applying majority logic.
  • Example 3 since radio waves of two different frequencies are used, an estimated value of the distance D can be obtained based on four received powers having different change characteristics with respect to the distance D. For this reason, the estimation precision of distance D can be raised more.
  • FIG. 6A shows a block diagram of the processing device 30 (FIG. 4) of the position detection device according to the fourth embodiment.
  • the processing device 30 includes a received power difference calculation unit 37 and a distance calculation unit 38, and further includes a distance selection unit 41.
  • the received power difference calculation unit 37 executes a first received power difference calculation process 37A and a second received power difference calculation process 37B.
  • the distance calculation unit 38 executes a first distance calculation process 38A and a second distance calculation process 38B.
  • the memory 31 (FIG. 4) stores a first received power difference-distance correspondence table 33 and a second received power-distance correspondence table 34.
  • FIG. 6B shows an example of the first received power difference-distance correspondence table 33 and the second received power difference-distance correspondence table 34 in a graph format.
  • the horizontal axis represents the distance D from the antenna installation position 13 to the transmitter 15 (FIG. 4) in the unit “m”, and the vertical axis represents the difference in received power in the unit “dBm”.
  • the solid line in FIG. 6B is the same as the difference PA1-PB1 between the first received power PA1 and the second received power PB1 shown in FIG. 3B.
  • the broken line in FIG. 6B indicates the difference PA2-PB2 between the third received power PA2 and the fourth received power PB2 shown in FIG. 5B.
  • the first received power difference calculation process 37A is the same as the process of the received power difference calculation unit 37 (FIG. 3A) of the position detection apparatus according to the second embodiment.
  • the first distance calculation process 38A is the same as the process of the distance calculation unit 38 (FIG. 3A) of the position detection device according to the second embodiment.
  • the fifth candidate value D5 (FIG. 6B) is obtained.
  • the second received power difference calculation process 37B a difference PA2-PB2 between the third received power PA2 and the fourth received power PB2 is obtained.
  • the sixth candidate value D6 (FIG. 6B) is obtained by applying the difference PA2-PB2 to the second received power difference-distance correspondence table 34.
  • the fifth candidate value D5 and the sixth candidate value D6 are about 5.5 m and about 6 m, respectively.
  • the distance selection unit 41 obtains an estimated value of the distance D based on the fifth candidate value D5 and the sixth candidate value D6. For example, the distance near the null point of the received power is excluded from the distance D estimation process. For example, when about 4 m is obtained as the sixth candidate value D6, as shown in FIG. 5B, the sixth candidate value D6 is in the vicinity of the null point. For this reason, the sixth candidate value D6 obtained as about 4 m is excluded from the distance D estimation process.
  • neither the fifth candidate value D5 nor the sixth candidate value D6 is near the null point.
  • the larger change amount of the received power difference with respect to the distance change is adopted as the estimated value of the distance D.
  • the absolute value of the slope of the difference PA2-PB2 is larger than the absolute value of the slope of the difference PA1-PB1 in the vicinity of the distance 6m. Therefore, the sixth candidate value D6 is adopted as the estimated value of the distance D.
  • the estimation accuracy can be increased.
  • FIG. 7 shows an example of a planar arrangement of the receiving antennas of the receiving device included in the position detecting device according to the fifth embodiment.
  • the first receiving antenna 21A and the second receiving antenna 21B are installed at one antenna installation position 13 (FIGS. 1 and 4) in the in-plane direction of the reflecting surface 10. It was.
  • the position detection device includes a first receiving device 20A, a second receiving device 20B, and a third receiving device 20C.
  • Each of the first receiving device 20A, the second receiving device 20B, and the third receiving device 20C is the receiving device 20 (FIGS. 1 and 4) of the position detecting device according to any one of the first to fourth embodiments. It has the same configuration as. That is, the first receiving device 20A, the second receiving device 20B, and the third receiving device 20C are respectively the first antenna installation position 13A, the second antenna installation position 13B, and the third antenna installation position 13C. Have two receiving antennas. The two receiving antennas are arranged at different positions in the height direction.
  • the first antenna installation position 13A, the second antenna installation position 13B, and the third antenna installation position 13C are positions that are not aligned in a straight line with respect to the most surface direction of the reflecting surface 10 (FIGS. 1 and 4), that is, It is arranged at a position corresponding to the apex of the triangle.
  • the processing device 30 reflects from the first antenna installation position 13A to the transmitter 15 (FIGS. 1 and 4) based on the reception strength of the radio waves received by the two receiving antennas of the first receiving device 20A.
  • a distance DA in the in-plane direction of the surface 10 is calculated.
  • the distance calculation method of the position detection device according to the first to fourth embodiments is applied.
  • the processing device 30 calculates the distance DB from the second antenna installation position 13B to the transmitter 15 and the distance DC from the third antenna installation position 13C to the transmitter 15.
  • the processing device 30 determines the position of the transmitter 15 based on the distance DA, the distance DB, the distance DC, the first antenna installation position 13A, the second antenna installation position 13B, and the third antenna installation position 13C.
  • a first circumference 14A having a radius of a distance DA centered on the first antenna installation position 13A, and a second circumference 14B having a radius of a distance DB centered on the second antenna installation position 13B It is estimated that the transmitter 15 is disposed at a position where the third circumference 14C having the radius of the distance DC intersects with the third antenna installation position 13C as the center.
  • the transmitter 15 is arranged at a position where a straight line passing through the intersection of the second circumference 14B and the third circumference 14C intersects.
  • Example 6 With reference to FIG. 8, a position detection apparatus according to Embodiment 6 will be described. Hereinafter, differences from the first embodiment will be described, and description of the same configuration will be omitted.
  • FIG. 8 is a schematic diagram of a position detection apparatus according to the sixth embodiment.
  • the first receiving antenna 21A, the second receiving antenna 21B, and the third receiving antenna 21C are located at the antenna installation position 13 with respect to the in-plane direction of the reflecting surface 10 and at different positions with respect to the height direction. Is arranged.
  • the processing device 30 is based on the first reception power PA1 of the first reception antenna 21A, the second reception power PB1 of the second reception antenna 21B, and the fifth reception power PC1 of the third reception antenna 21C. Then, an estimated value of the distance D from the antenna installation position 13 to the transmitter 15 is obtained.
  • a relationship between the fifth received power PC1 and the distance D is given.
  • the change characteristic of the fifth received power PC1 with respect to the distance D is different from both the change characteristics of the first received power PA1 and the second received power PB1.

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  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)

Abstract

L'invention concerne un dispositif de détection de position, dans lequel un émetteur qui rayonne des ondes électromagnétiques ayant une première fréquence est disposé au-dessus d'une surface réfléchissante qui réfléchit les ondes électromagnétiques. Un premier dispositif de réception comprend au moins deux antennes de réception qui sont respectivement disposées dans des positions qui sont identiques l'une à l'autre dans la direction dans le plan de la surface réfléchissante, mais sont différentes l'une de l'autre dans la direction de hauteur de la surface réfléchissante. Les ondes électromagnétiques ayant la première fréquence sont reçues au moyen des antennes de réception, lesdites ondes électromagnétiques ayant été rayonnées depuis l'émetteur. Sur la base des forces de réception des ondes électromagnétiques ayant la première fréquence, lesdites ondes électromagnétiques ayant été reçues au moyen des antennes de réception du premier dispositif de réception, un dispositif de traitement calcule des premières distances des antennes de réception à l'émetteur dans la direction dans le plan de la surface réfléchissante. La précision de calcul des distances du dispositif de réception à l'émetteur peut être améliorée en tenant compte de trajets multiples d'onde électromagnétique.
PCT/JP2015/076724 2014-10-07 2015-09-18 Dispositif de détection de position WO2016056383A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018054485A (ja) * 2016-09-29 2018-04-05 Kddi株式会社 端末位置判定装置及び端末位置判定プログラム

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