WO2021132430A1 - Récepteur, système de réception, émetteur, procédé de réception et programme - Google Patents

Récepteur, système de réception, émetteur, procédé de réception et programme Download PDF

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Publication number
WO2021132430A1
WO2021132430A1 PCT/JP2020/048353 JP2020048353W WO2021132430A1 WO 2021132430 A1 WO2021132430 A1 WO 2021132430A1 JP 2020048353 W JP2020048353 W JP 2020048353W WO 2021132430 A1 WO2021132430 A1 WO 2021132430A1
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Prior art keywords
signal
phase
signals
unit
change
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PCT/JP2020/048353
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English (en)
Japanese (ja)
Inventor
真理 中西
一弘 松本
柴野　伸之
尚樹 本間
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パナソニックＩｐマネジメント株式会社
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Priority to JP2021567593A priority Critical patent/JP7450231B2/ja
Publication of WO2021132430A1 publication Critical patent/WO2021132430A1/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
    • G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
    • G01S3/14—Systems for determining direction or deviation from predetermined direction
    • G01S3/28—Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived simultaneously from receiving antennas or antenna systems having differently-oriented directivity characteristics
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
    • H01Q21/08—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a rectilinear path
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/24—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the orientation by switching energy from one active radiating element to another, e.g. for beam switching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station

Definitions

  • the present disclosure relates to receivers, receiving systems, transmitters, receiving methods and programs, and more specifically to receivers, receiving systems, transmitters, receiving methods and programs that generate multiple signals.
  • the communication terminal device (receiver) described in Patent Document 1 estimates the arrival direction of the beacon signal (radio signal) transmitted by the beacon device (transmitter) based on the received signal strength (RSSI).
  • RSSI received signal strength
  • the present disclosure has been made in view of the above reasons, and an object of the present disclosure is to provide a receiver, a receiving system, a transmitter, a receiving method, and a program capable of improving the estimation accuracy of the arrival direction of a radio signal.
  • the receiver includes a plurality of antennas, a phase synthesizer, an output unit, and a change unit.
  • the plurality of antennas receive radio signals.
  • the phase synthesizing unit performs synthesis processing on a plurality of input signals based on the radio signals input from the plurality of antennas, and generates a composite signal for estimating the arrival direction of the radio signals.
  • the output unit outputs the combined signal.
  • the change unit performs a change process for changing at least one element related to the process from the reception of the radio signal to the generation of the composite signal.
  • the phase synthesizer generates a first composite signal as the composite signal before the change process by the changer.
  • the phase synthesis unit generates a second composite signal as the composite signal after the change processing by the change unit.
  • the output unit outputs the first composite signal and the second composite signal.
  • the transmitter includes a phase synthesizer, a plurality of antennas, and a changer.
  • the phase synthesizing unit performs synthesis processing on a plurality of input signals based on a plurality of original signals to generate a plurality of radio signals.
  • the plurality of antennas transmit the plurality of radio signals.
  • the change unit performs a change process for changing at least one element related to the process from the reception of the plurality of original signals to the transmission of the plurality of radio signals.
  • the phase synthesizing unit generates a plurality of first radio signals as the plurality of radio signals before the change processing by the change unit. Further, the phase synthesizing unit generates a plurality of second radio signals as the plurality of radio signals after the change processing by the change unit.
  • the plurality of antennas transmit the plurality of first radio signals and the plurality of second radio signals.
  • the receiving method includes a receiving step, a first phase synthesis step, a first output step, a change step, a second phase synthesis step, and a second output step. ..
  • the reception step the radio signal is received.
  • the first phase synthesis step a combination process is performed on a plurality of input signals based on the radio signal, and a first composite signal for estimating the arrival direction of the radio signal is generated.
  • the first output step the first composite signal generated in the first phase synthesis step is output.
  • the change step at least one element related to the processing from the reception step to the first phase synthesis step is changed.
  • the second phase synthesis step after the change step, a second composite signal different from the first composite signal generated in the first phase synthesis step is generated.
  • the second composite signal generated in the second phase synthesis step is output.
  • the program according to one aspect of the present disclosure causes one or more processors to execute the receiving method.
  • FIG. 1 is a schematic view showing an outline of the receiving system and the transmitter of the first embodiment.
  • FIG. 2 is a block diagram showing a functional configuration of the receiving system of the first embodiment.
  • FIG. 3 is a schematic view showing an outline of the receiving system and the transmitter of the second embodiment.
  • FIG. 4 is a block diagram showing a functional configuration of the transmitter of the second embodiment.
  • the transmitter 4 of the present embodiment is composed of, for example, a beacon device that transmits a beacon signal (radio signal) according to the standard of BLE (Bluetooth (registered trademark) Low Energy) (hereinafter, referred to as “BLE”). Will be done.
  • BLE Bluetooth (registered trademark) Low Energy
  • the transmitter 4 is not limited to the beacon device that transmits the beacon signal according to the BLE standard.
  • the transmitter 4 may be, for example, a device that transmits a radio signal according to the standard of WiFi (registered trademark).
  • the receiving system 1 includes a plurality of (three in the illustrated example) antennas 11 for receiving the radio signal transmitted by the transmitter 4.
  • the plurality of antennas 11 of the present embodiment are array antennas including the antenna 11a, the antenna 11b, and the antenna 11c. In the following description, when the specific antenna 11 is described, the antennas 11a, 11b, and 11c are described separately. Further, when a plurality of antennas 11 are described without distinction, they are simply referred to as antennas 11.
  • the receiving system 1 of the present embodiment is composed of a system capable of receiving a radio signal according to the BLE standard with a plurality of antennas 11.
  • the receiving system 1 is not limited to a system capable of receiving a radio signal according to the BLE standard.
  • the receiving system 1 may be, for example, a system capable of receiving a radio signal according to the WiFi standard.
  • the receiving system 1 of the present embodiment estimates the positional direction of the transmitter 4 that has transmitted the radio signal based on the received signal strength (RSSI) of the radio signal received by the plurality of antennas 11.
  • RSSI received signal strength
  • the reception system 1 of the present embodiment includes a receiver 2 and an estimation unit 3.
  • the receiver 2 receives the radio signal transmitted by the transmitter 4.
  • the receiver 2 When the receiver 2 receives the radio signal, it generates synthetic signals SS1 to SS4 for estimating the arrival direction of the radio signal based on the radio signal.
  • the receiver 2 performs a change process for changing at least one element related to the process from the reception of the radio signal to the generation of the combined signals SS1 to SS4.
  • the composite signals SS1 to SS4 generated by the receiver 2 based on the radio signal become different composite signals SS1 to SS4 before and after the change processing.
  • the receiver 2 outputs the combined signals SS1 to SS4 before and after the change processing to the estimation unit 3.
  • the estimation unit 3 estimates the arrival direction of the radio signal based on the combined signals SS1 to SS4 before and after the change processing output from the receiver 2. The method by which the estimation unit 3 estimates the arrival direction of the radio signal will be described in the column of "(3) Arrival direction estimation".
  • the receiver 2 includes a plurality of antennas 11, a switching unit 12, a phase synthesis unit 13, an output unit 14, and a change unit 15. ..
  • the plurality of antennas 11 are electrically connected to the switching unit 12. Each of the plurality of antennas 11 receives the radio signal transmitted by the transmitter 4.
  • the switching unit 12 is a processing unit that is electrically connected between the plurality of antennas 11 and the phase synthesizing unit 13 and switches the electrical connection state between the plurality of antennas 11 and the phase synthesizing unit 13.
  • the switching unit 12 includes a switch 16a, a switch 16b, and a switch 16c.
  • switches 16a, 16b, and 16c are described without distinction, they are simply referred to as the switch 16.
  • the switches 16a, 16b, and 16c are described separately.
  • the switching unit 12 performs a switching operation of the switches 16a to 16c by being controlled by the changing unit 15.
  • the switch 16b of the present embodiment has the antenna 11b and one of the first input terminal I1 and the second input terminal I2 of the phase synthesizer 17b included in the phase synthesizer 13 according to the control by the change unit 15. Electrically connect.
  • a state in which the antenna 11b and the first input terminal I1 of the phase synthesizer 17b are electrically connected by the switch 16b is referred to as a “first connection state”.
  • a state in which the antenna 11b and the second input terminal I2 of the phase synthesizer 17b are electrically connected by the switch 16b is referred to as a "second connection state”.
  • the switch 16a is controlled so that the antenna 11a and the first input terminal I1 of the phase synthesizer 17a are always electrically connected. That is, the switch 16a of the present embodiment does not perform the switching operation. Therefore, the switch 16a may be a simple electrical path connecting the antenna 11a and the first input terminal I1 of the phase synthesizer 17a.
  • the switch 16c is controlled so that the antenna 11c and the second input terminal I2 of the phase synthesizer 17c are always electrically connected. That is, the switch 16c of the present embodiment does not perform the switching operation. Therefore, the switch 16c may be a simple electric circuit that connects the antenna 11c and the second input terminal I2 of the phase synthesizer 17c.
  • the phase synthesizing unit 13 performs synthesis processing on a plurality of input signals IS1 to IS3 (signals IS4 to IS7) based on radio signals input from the plurality of antennas 11, and synthesizes for estimating the arrival direction of the radio signals.
  • This is a processing unit that generates signals SS1 to SS4.
  • the phase synthesizer 13 of the present embodiment generates different composite signals SS1 to SS4 before and after the switch 16b is switched.
  • the composite signals SS1 to SS4 generated by the phase synthesizer 13 in the first connection state are referred to as the first composite signals SS1 to SS4.
  • the composite signals SS1 to SS4 generated by the phase synthesizer 13 are referred to as the second composite signals SS1 to SS4.
  • the phase synthesizer 13 includes a phase synthesizer 17a, a phase synthesizer 17b, a phase synthesizer 17c, a phase synthesizer 17d, and a phase synthesizer 17e.
  • the phase synthesizer 17 is composed of, for example, a 90-degree hybrid unit (hybrid element).
  • the phase synthesizer 17 of the present embodiment produces a signal having a power value 1 / ⁇ 2 times that of the input signals IS1 to IS3 based on the radio signals input to the first input terminal I1 and the second input terminal I2.
  • Output is performed from the 1st output terminal O1 and the 2nd output terminal O2. Further, the phase synthesizer 17 outputs a signal having the same phase from the first output terminal O1 as compared with the input signals IS1 to IS3 based on the radio signal input to the first input terminal I1, and the phase is delayed by 90 degrees. The signal is output from the second output terminal O2.
  • the phase synthesizer 17a outputs the in-phase signal IS4 from the first output terminal O1 with a power value 1 / ⁇ 2 times that of the input signal IS1 based on the radio signal input to the first input terminal I1.
  • the phase synthesizer 17b has different input terminals electrically connected to the antenna 11b depending on the connection state.
  • the input signal IS2 based on the radio signal is input to the first input terminal I1.
  • the phase synthesizer 17b outputs the signal IS5 whose power value is 1 / ⁇ 2 times and whose phase is delayed by 90 degrees from the input signal IS2 from the second output terminal O2.
  • the phase synthesizer 17b outputs a signal IS6 having a power value 1 / ⁇ 2 times that of the input signal IS2 and having the same phase from the first output terminal O1.
  • the phase synthesizer 17b In the second connection state, the input signal IS2 is input to the second input terminal I2.
  • the phase synthesizer 17b outputs a signal IS5 having a power value 1 / ⁇ 2 times that of the input signal IS2 and having the same phase from the second output terminal O2. Further, the phase synthesizer 17b outputs a signal IS6 whose power value is 1 / ⁇ 2 times that of the input signal IS2 and whose phase is delayed by 90 degrees from the first output terminal O1.
  • the phase synthesizer 17c outputs an in-phase signal IS7 from the second output terminal O2 with a power value 1 / ⁇ 2 times that of the input signal IS3 based on the radio signal input to the second input terminal I2.
  • the phase synthesizer 17d receives the signal IS4 at the second input terminal I2 and the signal IS5 at the first input terminal I1.
  • the phase synthesizer 17d produces a signal having a power value of 1 / ⁇ 2 times that of the signal IS4 and a phase delay of 90 degrees, and a signal having a power value of 1 / ⁇ 2 times that of the signal IS5 and having the same phase.
  • the added combined signal SS1 is output from the first output terminal O1.
  • the phase synthesizer 17d has a signal having a power value of 1 / ⁇ 2 times that of the signal IS4 and having the same phase, and a signal having a power value of 1 / ⁇ 2 times that of the signal IS5 and having a phase delay of 90 degrees.
  • the combined signal SS2 is output from the second output terminal O2.
  • the phase synthesizer 17e receives the signal IS6 at the second input terminal I2 and the signal IS7 at the first input terminal I1.
  • the phase synthesizer 17e produces a signal having a power value of 1 / ⁇ 2 times that of the signal IS6 and a phase delay of 90 degrees, and a signal having a power value of 1 / ⁇ 2 times that of the signal IS7 and having the same phase.
  • the added combined signal SS3 is output from the first output terminal O1.
  • the phase synthesizer 17e has a signal having a power value of 1 / ⁇ 2 times that of the signal IS6 and having the same phase, and a signal having a power value of 1 / ⁇ 2 times that of the signal IS7 and having a phase delay of 90 degrees.
  • the combined signal SS4 is output from the second output terminal O2.
  • the change unit 15 is a processing unit that performs a change process for changing at least one element related to the process from the reception of the radio signal to the generation of the combined signals SS1 to SS4.
  • the changing unit 15 of the present embodiment performs a process of controlling the switching unit 12 so as to switch the electrical connection state between the plurality of antennas 11 and the phase synthesizing unit 13 as at least a part of the changing process.
  • the changing unit 15 switches the electrical connection state between the antenna 11b and the phase synthesizer 17b by controlling the switch 16b to be switched.
  • the connection state between the antenna 11b and the phase synthesizer 17b is the first connection state until the change unit 15 performs the change processing.
  • connection state between the antenna 11b and the phase synthesizer 17b is the second connection state after the change unit 15 performs the change processing.
  • the change unit 15 performs the change process at a predetermined timing.
  • the predetermined timing is, for example, a timing at which the phase synthesizing unit 13 outputs the combined signals SS1 to SS4, a constant timing set according to the interval at which the transmitter 4 transmits the radio signal, and the like.
  • the output unit 14 outputs the combined signals SS1 to SS4 generated by the phase synthesizing unit 13 to the estimation unit 3. Specifically, the output unit 14 has the first composite signals SS1 to SS4 generated by the phase synthesis unit 13 before the change processing is performed by the change unit 15, and the phase before the change processing is performed by the change unit 15. The second composite signals SS1 to SS4 generated by the synthesis unit 13 are output to the estimation unit 3.
  • the estimation unit 3 estimates the arrival direction of the radio signal.
  • the complex propagation channel between the antenna 11a and the transmitting antenna of the transmitter 4 is h1
  • the complex propagation channel between the antenna 11b and the transmitting antenna is h2
  • the complex propagation channel between the antenna 11c and the transmitting antenna is Let h3 be the complex propagation channel. Further, the distance between the antenna 11a and the antenna 11b and the distance between the antenna 11b and the antenna 11c are d1.
  • the transmitter 4 exists at a position at an angle ⁇ 1 with respect to the broadside direction of the array antenna composed of the antenna 11a, the antenna 11b, and the antenna 11c.
  • the estimation unit 3 estimates the arrival direction of the radio signal based on the first combined signals SS1 to SS4 will be described.
  • the propagation channels can be collectively expressed as Eq. (1).
  • the correlation matrix of this propagation channel can be expressed by Eq. (2).
  • the symbol H represents the complex conjugate transpose
  • the symbol * represents the complex conjugate.
  • the diagonal term of the correlation matrix R is a real number
  • the off-diagonal term is a complex number.
  • the amplitudes of the plurality of first composite signals SS1 to SS4 input to the estimation unit 3 can be expressed as equations (3) to (6).
  • represents the amplitude of the composite signal SS1 output from the first output terminal O1 of the phase synthesizer 17d.
  • represents the amplitude of the composite signal SS2 output from the second output terminal O2 of the phase synthesizer 17d.
  • represents the amplitude of the composite signal SS3 output from the first output terminal O1 of the phase synthesizer 17e.
  • represents the amplitude of the composite signal SS4 output from the second output terminal O2 of the phase synthesizer 17e.
  • the gain of the channel on the left side of the equations (3) to (6) can be expressed by the equations (7) to (10) from the received signal strength.
  • the correlation matrix related to the composite signals SS1 and SS2 output from the phase synthesizer 17d is defined as R1.
  • the correlation matrix R1 is expressed using A and ⁇ , it can be expressed by the equation (16).
  • the correlation matrix R is defined as R2.
  • the correlation matrix R2 is expressed using B and ⁇ , the equation (21) is obtained, and the correlation matrix R is estimated.
  • the declination is estimated in two ways for ⁇ and ⁇ , four kinds of solutions are estimated. Therefore, it is necessary to select the solutions of ⁇ and ⁇ .
  • the solution of ⁇ and ⁇ the combination of solutions having the smallest difference between ⁇ and ⁇ is selected.
  • the transmitting antenna of the transmitter 4 and the antennas 11a, 11b, 11c are sufficiently separated from each other, and the directions of the transmitting antennas of the transmitter 4 as seen from the antennas 11a, 11b, 11c can all be regarded as equal ⁇ (FIG. FIG. 1). Further, the antenna 11a, the antenna 11b, and the antenna 11c are aligned at equal intervals d1.
  • the difference in phase delay between h1 and h2 is equal to the difference in phase delay between h2 and h3.
  • ⁇ represents the difference in phase delay between h1 and h2
  • ⁇ represents the difference in phase delay between h2 and h3. That is, ⁇ and ⁇ can be regarded as coincident. Therefore, by selecting the combination of solutions having the smallest difference between ⁇ and ⁇ as the solutions of ⁇ and ⁇ , it is possible to narrow down to two solutions.
  • R13 represents the correlation of the radio signal between the antenna 11a and the antenna 11c.
  • R13 can be expressed by the equation (22) using the obtained
  • the estimated correlation matrix R can be expressed as Eq. (23).
  • the estimation unit 3 estimates the direction of the transmitter 4 by using the MUSIC (MUltiple SIgnal Classification) method or the like for the correlation matrix R.
  • MUSIC MUltiple SIgnal Classification
  • the correlation matrix R can be expressed by Eq. (24) by eigenvalue decomposition.
  • v1, v2, and v3 are the first, second, and third eigenvectors, respectively. Further, ⁇ 1, ⁇ 2, and ⁇ 3 are the first, second, and third eigenvalues, respectively, and it is assumed that the equation (27) is used.
  • ⁇ 1 corresponds to the electric power including the signal
  • ⁇ 2 and ⁇ 3 correspond to the noise electric power.
  • the arrival direction of the radio signal is estimated by using the equation (28), which is an evaluation equation using such an eigenvector.
  • equation (29) is called a steering vector.
  • the estimation unit 3 substitutes various values for ⁇ 0 in the equation (28), and determines that the direction in which Pmusic is maximized is the departure direction of the radio signal.
  • the arrival direction estimated by the estimation unit 3 based on the first composite signals SS1 to SS4 will be referred to as the "first estimation direction”.
  • the estimation unit 3 estimates the arrival direction of the radio signal based on the second composite signals SS1 to SS4.
  • the amplitudes of the plurality of second composite signals SS1 to SS4 input to the estimation unit 3 can be expressed by the equations (30) to (33).
  • Y1a represents the amplitude of the composite signal SS1 output from the first output terminal O1 of the phase synthesizer 17d.
  • Y2a represents the amplitude of the composite signal SS2 output from the second output terminal O2 of the phase synthesizer 17d.
  • Y3a represents the amplitude of the composite signal SS4 output from the second output terminal O2 of the phase synthesizer 17e.
  • Y4a represents the amplitude of the composite signal SS3 output from the first output terminal O1 of the phase synthesizer 17e.
  • the estimation unit 3 can estimate the arrival direction different from the first estimation direction by obtaining the correlation matrix R using the equations (30) to (33).
  • the description of a specific method for obtaining the correlation matrix R using the equations (30) to (33) will be omitted.
  • the arrival direction estimated by the estimation unit 3 based on the second composite signals SS1 to SS4 will be referred to as the "second estimation direction”.
  • the estimation unit 3 estimates the arrival direction of the radio signal (positional direction of the transmitter 4) based on the first estimation direction and the second estimation direction. For example, the estimation unit 3 may estimate the arrival direction of the radio signal by averaging the first estimation direction and the second estimation direction. Since the estimation unit 3 of the present embodiment estimates the arrival direction of the radio signal based on a plurality of estimation directions, the estimation unit 3 is wireless as compared with the existing receiving system that estimates the arrival direction of the radio signal based on one estimation direction. The accuracy when estimating the arrival direction of the signal is improved.
  • the receiving system 1 of the present embodiment includes the receiver 2 and the estimation unit 3.
  • the receiver 2 includes a plurality of antennas 11, a phase synthesizing unit 13, an output unit 14, and a changing unit 15.
  • the plurality of antennas 11 receive the radio signal.
  • the change unit 15 performs a change process for changing at least one element related to the process from the reception of the radio signal to the generation of the combined signals SS1 to SS4.
  • the phase synthesizer 13 performs synthesis processing on a plurality of input signals IS1 to IS3 based on radio signals input from the plurality of antennas 11 to estimate the arrival direction of the radio signal (positional direction of the transmitter 4). Synthesized signals SS1 to SS4 are generated.
  • the phase synthesis unit 13 generates the first composite signals SS1 to SS4 as the composite signals SS1 to SS4 before the change processing by the change unit 15. Further, the phase synthesizing unit 13 generates the second combined signals SS1 to SS4 as the combined signals SS1 to SS4 after the change processing by the changing unit 15. That is, the phase synthesizing unit 13 generates the combined signals SS1 to SS4 having different patterns before and after the change processing by the changing unit 15. In other words, the receiver 2 of the present embodiment can increase the patterns of the combined signals SS1 to SS4 for estimating the arrival direction of the radio signal.
  • the output unit 14 outputs the first composite signals SS1 to SS4 and the second composite signals SS1 to SS4 to the estimation unit 3.
  • the estimation unit 3 estimates the arrival direction of the radio signal based on the first composite signals SS1 to SS4 and the second composite signals SS1 to SS4 output from the output unit 14 of the receiver 2.
  • the estimation unit 3 can estimate the arrival direction of the radio signal based on the combined signals SS1 to SS4 of two or more patterns. Therefore, the estimation unit 3 estimates the arrival direction of the radio signal based on the combined signals SS1 to SS4 of one pattern. The accuracy of the arrival direction estimation is improved as compared with the case of doing so.
  • the receiver 2 of the present embodiment further includes a switching unit 12.
  • the switching unit 12 switches the electrical connection state between the plurality of antennas 11 and the phase synthesizing unit 13. More specifically, the electrical connection state between the antenna 11b and the phase synthesizer 17b is switched from the first connection state to the second connection state, or from the second connection state to the first connection state.
  • the changing unit 15 performs a process of controlling the switching unit 12 so as to switch the electrical connection state between the plurality of antennas 11 and the phase synthesizing unit 13 as at least a part of the changing process.
  • the receiver 2 can easily increase the patterns of the combined signals SS1 to SS4 for estimating the arrival direction of the radio signal by switching the electrical connection state between the plurality of antennas 11 and the phase synthesizer 13. .. Therefore, the receiver 2 can easily improve the accuracy of estimating the arrival direction of the radio signal.
  • the phase synthesis unit 13 of the present embodiment is provided with a plurality of input units (input terminals) that are electrically connected to the plurality of antennas 11 and to which a wireless signal is input.
  • a first input terminal I1 of the phase synthesizer 17a there are four input terminals: a first input terminal I1 of the phase synthesizer 17a, a first input terminal I1 and a second input terminal I2 of the phase synthesizer 17b, and a second input terminal I2 of the phase synthesizer 17c.
  • the plurality of antennas 11 of the present embodiment are three antennas 11a, 11b, and 11c. That is, the number of the plurality of antennas 11 of the present embodiment is equal to or less than the number of the plurality of input units.
  • the configuration of the receiver 2 (reception system 1) can be made compact. Further, the receiver 2 switches the electrical connection state between the plurality of antennas 11 and the input unit to obtain a wireless signal pattern for estimating the arrival direction of the wireless signal without increasing the number of antennas 11. It can be easily increased. That is, the receiver 2 can improve the accuracy of estimating the arrival direction of the radio signal without increasing the number of antennas 11. However, even if the number of antennas 11 is larger than the number of input units, the effect of improving the estimation accuracy of the arrival direction of the radio signal of the receiving system 1 in the present embodiment is not lost. .. Therefore, the number of antennas 11 of the receiver 2 may be larger than the number of input units.
  • the transmitter 4a of the present embodiment includes a plurality of (three in the illustrated example) antennas 21 for transmitting a plurality of radio signals.
  • the plurality of antennas 21 of this embodiment are array antennas including the antenna 21a, the antenna 21b, and the antenna 21c.
  • the antennas 21a, 21b, and 21c are described separately. Further, when a plurality of antennas 21 are described without distinction, they are simply described as antennas 21.
  • the receiving system 1a of the present embodiment includes a receiving antenna that receives a plurality of radio signals transmitted from the plurality of antennas 21.
  • the receiving system 1a of the present embodiment is a receiving system that estimates the position direction of the transmitter 4a that has transmitted a plurality of radio signals based on the received signal strength of the plurality of radio signals received by the receiving antenna, for example, a smartphone or the like. Consists of.
  • the transmitter 4a includes a plurality of antennas 21, a switching unit 22, a phase synthesis unit 23, a source signal generation unit 24, and a change unit 25.
  • the plurality of antennas 21 are electrically connected to the switching unit 22. Each of the plurality of antennas 21 transmits a plurality of radio signals RS1 to RS3 generated by the phase synthesizer 23.
  • the switching unit 22 is a processing unit that is electrically connected between the plurality of antennas 21 and the phase synthesizing unit 23 and switches the electrical connection state between the plurality of antennas 21 and the phase synthesizing unit 23.
  • the switching unit 22 includes a switch 26a, a switch 26b, and a switch 26c.
  • switches 26a, 26b, and 26c are described without distinction, they are simply referred to as the switch 26. Further, when the specific switch 26 is described, the switches 26a, 26b, and 26c are described separately.
  • the switching unit 22 performs a switching operation of the switches 26a to 26c by being controlled by the changing unit 25.
  • the switch 26b of the present embodiment has an antenna 21b and one of the first output terminal O1 and the second output terminal O2 of the phase synthesizer 27b included in the phase synthesizer 23, according to the control by the change unit 25. Electrically connect.
  • a state in which the antenna 21b and the second output terminal O2 of the phase synthesizer 27b are electrically connected by the switch 26b will be referred to as a “first connection state”.
  • a state in which the antenna 21b and the first output terminal O1 of the phase synthesizer 27b are electrically connected by the switch 26b is referred to as a "second connection state”.
  • the switch 26a is controlled so that the antenna 21a and the second output terminal O2 of the phase synthesizer 27a are always electrically connected. That is, the switch 26a of the present embodiment does not perform the switching operation. Therefore, the switch 26a may be a simple electrical path connecting the antenna 21a and the second output terminal O2 of the phase synthesizer 27a.
  • the switch 26c is controlled so that the antenna 21c and the first output terminal O1 of the phase synthesizer 27c are always electrically connected. That is, the switch 26c of the present embodiment does not perform the switching operation. Therefore, the switch 26c may be a simple electric circuit that connects the antenna 21c and the first output terminal O1 of the phase synthesizer 27c.
  • the original signal generation unit 24 is a processing unit that generates original signals BS1 to BS4 that are sources of a plurality of radio signals RS1 to RS3 transmitted by the plurality of antennas 21 and include predetermined information such as identification information. Is.
  • the original signal generator 24 includes the original signal generators 24a to 24d.
  • the original signal generator 24a is electrically connected to the first input terminal I1 of the phase synthesizer 27d of the phase synthesizer 23 to generate the original signal BS1.
  • the original signal generator 24b is electrically connected to the second input terminal I2 of the phase synthesizer 27d to generate the original signal BS2.
  • the original signal generator 24c is electrically connected to the first input terminal I1 of the phase synthesizer 27e to generate the original signal BS3.
  • the original signal generator 24d is electrically connected to the second input terminal I2 of the phase synthesizer 27e to generate the original signal BS4.
  • the phase synthesis unit 23 is a processing unit that performs synthesis processing on a plurality of input signals IS8 to IS11 (signals IS12 to IS15) based on a plurality of original signals BS1 to BS4 to generate a plurality of radio signals RS1 to RS3. .. Further, the phase synthesizing unit 23 of the present embodiment generates a plurality of different radio signals RS1 to RS3 before and after the switch 26b is switched.
  • the plurality of radio signals RS1 to RS3 generated by the phase synthesizing unit 23 are referred to as the plurality of first radio signals RS1 to RS3.
  • the plurality of radio signals RS1 to RS3 generated by the phase synthesizing unit 23 are designated as the plurality of second radio signals RS1 to RS3.
  • the phase synthesizer 23 includes a phase synthesizer 27a, a phase synthesizer 27b, a phase synthesizer 27c, a phase synthesizer 27d, and a phase synthesizer 27e.
  • the phase synthesizer 27 is composed of, for example, a 90-degree hybrid unit (hybrid element). Since the basic operation of the phase synthesizer 27 is the same as the basic operation of the phase synthesizer 17 described in the column of "(2.2) Configuration of receiver 2 in (first embodiment)", the description thereof is omitted. To do.
  • the phase synthesizer 27d receives the input signal IS8 based on the original signal BS1 at the first input terminal I1 and the input signal IS9 based on the original signal BS2 at the second input terminal I2.
  • the phase synthesizer 27d has a power value of 1 / ⁇ 2 times that of the input signal IS8 and a signal having the same phase, and a signal having a power value of 1 / ⁇ 2 times that of the input signal IS9 and a phase delay of 90 degrees. , Is added together, and the signal IS12 is output from the first output terminal O1.
  • the phase synthesizer 27d has a signal having a power value 1 / ⁇ 2 times that of the input signal IS8 and a phase delay of 90 degrees, and a signal having a power value of 1 / ⁇ 2 times that of the input signal IS9 and having the same phase.
  • the signal IS13 which is the sum of the signal and the signal, is output from the second output terminal O2.
  • the phase synthesizer 27e receives the input signal IS10 based on the original signal BS3 at the first input terminal I1 and the input signal IS11 based on the original signal BS4 at the second input terminal I2.
  • the phase synthesizer 27e has a power value of 1 / ⁇ 2 times that of the input signal IS10 and a signal having the same phase, and a signal having a power value of 1 / ⁇ 2 times that of the input signal IS11 and a phase delay of 90 degrees. , Is added together, and the signal IS14 is output from the first output terminal O1.
  • the phase synthesizer 27e has a signal having a power value of 1 / ⁇ 2 times that of the input signal IS10 and a phase delay of 90 degrees, and a signal having a power value of 1 / ⁇ 2 times that of the input signal IS11 and having the same phase.
  • the signal IS15 which is the sum of the signal and the signal, is output from the second output terminal O2.
  • the phase synthesizer 27a outputs a radio signal RS1 having a power value 1 / ⁇ 2 times that of the signal IS12 input to the second input terminal I2 and having the same phase from the second output terminal O2.
  • the phase synthesizer 27b receives the signal IS13 at the first input terminal I1 and the signal IS14 at the second input terminal I2.
  • the phase synthesizer 27b has a power value of 1 / ⁇ 2 times that of the signal IS13 and a phase delayed by 90 degrees, and a power value of 1 / ⁇ 2 times that of the signal IS14.
  • the radio signal RS2 which is the sum of the signals having the same phase in the above, is output from the second output terminal O2.
  • the phase synthesizer 27b has a power value of 1 / ⁇ 2 times that of the signal IS13 and a signal having the same phase, and a power value of 1 / ⁇ 2 times that of the signal IS14.
  • the radio signal RS2, which is the sum of the signal whose phase is delayed by 90 degrees, is output from the first output terminal O1.
  • the phase synthesizer 27c outputs a radio signal RS3 having a power value 1 / ⁇ 2 times that of the signal IS15 input to the first input terminal I1 and having the same phase from the first output terminal O1.
  • the change unit 25 is a processing unit that performs a change process for changing at least one element related to the process from the input of the plurality of original signals BS1 to BS4 to the transmission of the plurality of radio signals RS1 to RS3.
  • the changing unit 25 of the present embodiment performs a process of controlling the switching unit 22 so as to switch the electrical connection state between the plurality of antennas 21 and the phase synthesizing unit 23 as at least a part of the changing process. Specifically, the changing unit 25 switches the electrical connection state between the antenna 21b and the phase synthesizer 27b by controlling the switch 26b to be switched.
  • connection state between the antenna 21b and the phase synthesizer 27b is the first connection state until the change unit 25 performs the change processing. Further, it is assumed that the connection state between the antenna 21b and the phase synthesizer 27b is the second connection state after the change unit 25 performs the change processing.
  • the change unit 25 performs the change process at a predetermined timing.
  • the predetermined timing is, for example, a timing at which the phase synthesizer 23 outputs a plurality of radio signals RS1 to RS3, a constant timing set according to the interval at which the transmitter 4a transmits the radio signal, and the like.
  • the receiving system 1a estimates the arrival directions of the plurality of radio signals RS1 to RS3 with reference to FIG.
  • the matters explained in the column of "(3) Estimating the direction of arrival in (1st embodiment)" will be omitted as appropriate.
  • the complex propagation channel between the antenna 21a and the receiving antenna of the receiving system 1a is h4
  • the complex propagation channel between the antenna 21b and the receiving antenna is h5
  • the complex propagation channel between the antenna 21c and the receiving antenna is between the antenna 21c and the receiving antenna.
  • Let h6 be the complex propagation channel.
  • the distance between the antenna 21a and the antenna 21b and the distance between the antenna 21b and the antenna 21c are d2.
  • the receiving system 1a exists at a position of an angle ⁇ 2 with respect to the broadside direction of the array antenna composed of the antenna 21a, the antenna 21b, and the antenna 21c.
  • the receiving system 1a estimates the arrival directions of the plurality of first radio signals RS1 to RS3.
  • the propagation channels can be collectively expressed as Eq. (34).
  • the correlation matrix of this propagation channel can be expressed by Eq. (35).
  • the receiving system 1a can estimate the arrival directions of the plurality of first radio signals RS1 to RS3.
  • the receiving system 1a obtains the correlation matrix R based on the information regarding the received signal strength.
  • the apparent propagation channel can be expressed as the equations (41) to (44).
  • the method of obtaining the correlation matrix R based on the equations (41) to (44) is as described in the column of "(3) Estimating the direction of arrival in (first embodiment)", the description thereof will be omitted. Further, the method of obtaining the arrival directions of the plurality of first radio signals RS1 to RS3 by using a predetermined algorithm such as the MUSIC method for the correlation matrix R is also described in "(3) Arrival direction estimation in (1st embodiment)". Since it is as explained in the column, the description is omitted. In the following description, the arrival directions of the plurality of first radio signals RS1 to RS3 estimated by the receiving system 1a will be referred to as "first estimated directions”.
  • the receiving system 1a estimates the arrival directions of the plurality of second radio signals RS1 to RS3 will be described.
  • the amplitudes of the original signals BS1, BS2, BS3, BS4 measured by the receiving system 1a can be expressed by equations (45) to (48).
  • the receiving system 1a can estimate the arrival direction different from the first estimation direction by obtaining the correlation matrix R using the equations (45) to (48).
  • the description of a specific method for obtaining the correlation matrix R using the equations (45) to (48) will be omitted.
  • the arrival directions of the plurality of second radio signals RS1 to RS3 estimated by the receiving system 1a will be referred to as "second estimated directions”.
  • the receiving system 1a that has received the plurality of first and second radio signals transmitted by the transmitter 4a receives the arrival directions of the plurality of radio signals RS1 to RS3 based on the first estimation direction and the second estimation direction (transmitter 4a).
  • (Position direction) is estimated.
  • the receiving system 1a may estimate the arrival directions of the plurality of radio signals RS1 to RS3 by averaging the first estimation direction and the second estimation direction.
  • the receiving system 1a that has received the plurality of first and second radio signals RS1 to RS3 transmitted by the transmitter 4a estimates the arrival directions of the radio signals RS1 to RS3 based on the plurality of estimation directions.
  • the accuracy in estimating the arrival direction of the radio signals RS1 to RS3 is higher than that of the existing receiving system that estimates the arrival direction of the radio signals RS1 to RS3 based on a plurality of radio signals RS1 to RS3 in one pattern. improves.
  • the transmitter 4a of the present embodiment includes a phase synthesizing unit 23, a plurality of antennas 21, and a changing unit 25.
  • the phase synthesizing unit 23 performs synthesis processing on a plurality of input signals IS8 to IS11 (signals IS12 to IS15) based on the plurality of original signals BS1 to BS4, and generates a plurality of radio signals RS1 to RS3.
  • the change unit 25 performs a change process for changing at least one element related to the process from the reception of the plurality of input signals IS8 to IS11 to the transmission of the plurality of radio signals RS1 to RS3.
  • the phase synthesis unit 23 generates a plurality of first radio signals RS1 to RS3 as the plurality of radio signals RS1 to RS3 before the change processing by the change unit 25. Further, the phase synthesis unit 23 generates a plurality of second radio signals RS1 to RS3 as the plurality of radio signals RS1 to RS3 after the change processing by the change unit 25.
  • the plurality of antennas 21 transmit a plurality of first radio signals RS1 to RS3 and a plurality of second radio signals RS1 to RS3.
  • the receiving system 1a estimates the direction of the transmitter 4a based on the plurality of radio signals RS1 to RS3 having two or more patterns. be able to. Therefore, the accuracy of estimation is improved as compared with the case where the receiving system 1a estimates the position direction of the transmitter 4a based on a plurality of radio signals of one pattern.
  • the changing unit 15 may perform a process of changing the setting related to the time when the plurality of antennas 11 receive the radio signal as at least a part of the changing process.
  • the changing unit 15 changes the time length and reception timing when the plurality of antennas 11 receive the radio signal, so that the phase synthesizing unit 13 generates the combined signals SS1 to SS4 of two or more patterns. That is, as the patterns of the combined signals SS1 to SS4 increase, the value of
  • value pattern increases. Therefore, the estimation result of the arrival direction of the unvoiced signal estimated by the receiving system 1 increases, and the estimation accuracy is improved.
  • the changing unit 25 performs a process of changing the setting related to the time when the plurality of antennas 21 transmit the plurality of radio signals RS1 to RS3 as at least a part of the changing process. You may.
  • the change unit 25 changes the time length and transmission timing when the plurality of antennas 21 transmit the plurality of radio signals RS1 to RS3, so that the transmitter 4a transmits the plurality of radio signals RS1 to RS3 having two or more patterns.
  • Send Since the receiving system 1a estimates the direction of the transmitter 4a based on a plurality of radio signals RS1 to RS3 having two or more patterns, the estimation accuracy is improved.
  • the phase synthesizing unit 13 may perform a phase shift process with respect to at least one of a plurality of input signals IS1 to IS3 (signals IS4 to IS7) in the synthesizing process. .. Further, the changing unit 15 may perform a process in which the phase synthesizing unit 13 changes the amount of phase shift of the input signals IS1 to IS3 (signals IS4 to IS7) in the synthesizing process as at least a part of the changing process.
  • the first composite signals SS1 to SS4 and the second composite signals SS1 to SS4 have different phase shifts of the input signals IS1 to IS3 (signals IS4 to IS7) by switching the switch 16b.
  • the change unit 15 performs a change process in which the phase synthesizer 13 changes the amount of phase shift of the input signals IS1 to IS3 (signals IS4 to IS7) in the synthesis process, whereby the second composite signal SS1 similar to the above embodiment is performed. It becomes possible to generate ⁇ SS4. Since the receiving system 1 estimates the arrival direction of the radio signal (direction of the transmitter 4) based on the combined signals SS1 to SS4 of two or more patterns, the estimation accuracy is improved.
  • the phase synthesizing unit 23 performs a phase shift process with respect to at least one of the plurality of input signals IS8 to IS11 (signals IS12 to IS15) in the synthesizing process. May be good.
  • the changing unit 25 may perform a process in which the phase synthesizing unit 23 changes the amount of shifting the phase of the input signals IS8 to IS11 (signals IS12 to IS15) in the synthesizing process as at least a part of the changing process.
  • the transmitter 4a of the above embodiment by switching the switch 26b, a plurality of first radio signals RS1 to RS3 and a plurality of second radio signals RS1 to RS3 in which the phase shifts of the input signals IS8 to IS11 (signals IS12 to IS15) are different from each other.
  • the radio signals RS1 to RS3 were generated.
  • the change unit 25 performs a change process for changing the amount of phase shift of the input signals IS8 to IS11 (signals IS12 to IS15) by the phase synthesizer 23 in the synthesis process, whereby a plurality of second units similar to those in the above embodiment are performed. It is possible to generate radio signals RS1 to RS3. Since the receiving system 1a estimates the direction of the transmitter 4a based on a plurality of radio signals RS1 to RS3 having two or more patterns, the estimation accuracy is improved.
  • the plurality of antennas 11 may be able to receive a plurality of radio signals having different frequency bands from each other as radio signals.
  • the radio signal complies with, for example, the BLE standard
  • the plurality of antennas 11 divides 2.400 [GHz] to 2.480 [GHz] into 2 [MHz] widths and divides each of the radio signals into 40 frequency bands. It may be receivable.
  • the change unit 15 may perform a process of switching the frequency band of the radio signal to be the target of the synthesis process as at least a part of the change process.
  • the phase combining unit 13 When the changing unit 15 switches the frequency band of the radio signal to be combined, the phase combining unit 13 generates the combined signals SS1 to SS4 of two or more patterns. Since the receiving system 1 estimates the arrival direction of the radio signal (direction of the transmitter 4) based on the combined signals SS1 to SS4 of two or more patterns, the estimation accuracy is improved.
  • the plurality of antennas 21 may be capable of transmitting a plurality of radio signals RS1 to RS3 having different frequency bands from each other as the plurality of radio signals RS1 to RS3. Then, the changing unit 25 may perform a process of switching the frequency bands of the plurality of radio signals RS1 to RS3 transmitted by the plurality of antennas 21 as at least a part of the changing process. Before and after the change process by the change unit 25, the plurality of antennas 21 transmit a plurality of radio signals RS1 to RS3 having two or more patterns having different frequency bands from each other. Since the receiving system 1a estimates the direction of the transmitter 4a based on a plurality of radio signals RS1 to RS3 having two or more patterns, the estimation accuracy is improved.
  • the plurality of antennas 11 may be able to receive a plurality of polarized waves different from each other as radio signals.
  • the plurality of polarized waves that are different from each other are, for example, horizontally polarized waves, vertically polarized waves, and circularly polarized waves.
  • the changing unit 15 performs a process of switching the type of polarization of the radio signal to be the target of the synthesis process as at least a part of the change process.
  • the changing unit 15 switches the type of polarization of the radio signal to be combined, so that the plurality of antennas 11 receive the radio signals having different types of polarization.
  • the phase synthesizing unit 13 generates the combined signals SS1 to SS4 of two or more patterns. Since the receiving system 1 estimates the arrival direction of the radio signal (direction of the transmitter 4) based on the combined signals SS1 to SS4 of two or more patterns, the estimation accuracy is improved.
  • the plurality of antennas 21 may be capable of transmitting a plurality of different polarized waves as a plurality of radio signals RS1 to RS3. Then, the changing unit 25 may perform a process of switching the polarization type of the plurality of radio signals RS1 to RS3 transmitted by the plurality of antennas 21 as at least a part of the changing process. Before and after the change process by the change unit 25, the plurality of antennas 21 transmit a plurality of radio signals RS1 to RS3 having two or more patterns having different types of polarization from each other. Since the receiving system 1a estimates the direction of the transmitter 4a based on a plurality of radio signals RS1 to RS3 having two or more patterns, the estimation accuracy is improved.
  • the receiver 2 includes a switching unit 12, but the switching unit 12 is not essential.
  • the receiver 2 may include at least a plurality of antennas 11, a phase synthesis unit 13, an output unit 14, and a change unit 15.
  • the transmitter 4a includes the switching unit 22 and the original signal generating unit 24, but the switching unit 22 and the original signal generating unit 24 are not indispensable.
  • the transmitter 4a may include at least a plurality of antennas 21, a phase synthesizing unit 23, and a changing unit 25.
  • the receiving system 1 is realized by one system including the receiver 2 and the estimation unit 3, but may be realized by two or more systems.
  • the functions of the receiver 2 and the estimation unit 3 may be distributed in two or more systems.
  • at least one function of the receiver 2 and the estimation unit 3 may be distributed and provided in two or more systems.
  • the functions of the receiver 2 and the estimation unit 3 may be distributed to a plurality of devices.
  • the functions of the receiver 2 may be distributed and provided in two or more devices.
  • at least a part of the functions of the receiving system 1 may be realized by, for example, cloud computing.
  • the above-described embodiment (including each modification) is only one of various embodiments.
  • the above-described embodiment can be variously modified depending on the design and the like as long as the object of the present disclosure can be achieved.
  • the same function as that of the receiving system 1 may be realized by a receiving method, a program, a recording medium on which the program is recorded, or the like.
  • the receiving method includes a receiving step, a first phase synthesis step, a first output step, a change step, a second phase synthesis step, and a second output step.
  • the radio signal is received.
  • the first phase synthesis step the plurality of input signals IS1 to IS3 based on the radio signal are combined, and the first synthetic signals SS1 to SS4 for estimating the arrival direction of the radio signal are generated.
  • the first output step the first composite signals SS1 to SS4 generated in the first phase synthesis step are output.
  • the change step at least one element related to the processing from the reception step to the first phase synthesis step is changed.
  • the second composite signals SS1 to SS4 different from the first composite signals SS1 to SS4 generated in the first phase synthesis step are generated.
  • the second composite signals SS1 to SS4 generated in the second phase synthesis step are output.
  • the (computer) program includes one or more of the above-mentioned reception step, first phase synthesis step, first output step, change step, second phase synthesis step, and second output step. It is a program to be executed by the processor of.
  • the receiver 2, the receiving system 1, the transmitter 4a, and the executing body of the receiving method include a computer system.
  • a computer system mainly consists of a processor and a memory as hardware.
  • the processor executes the program recorded in the memory of the computer system, the functions as the executing body of the receiver 2, the receiving system 1, the transmitter 4a, and the receiving method are realized.
  • the program may be pre-recorded in the memory of the computer system. Further, the program may be provided through a telecommunication line, or may be recorded and provided on a recording medium such as a memory card, an optical disk, or a hard disk drive that can be read by a computer system.
  • a processor in a computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large scale integrated circuit (LSI).
  • IC semiconductor integrated circuit
  • LSI large scale integrated circuit
  • a plurality of electronic circuits may be integrated on one chip, or may be distributed on a plurality of chips.
  • the plurality of chips may be integrated into one device, or may be distributed and provided in a plurality of devices.
  • the receiver (2) includes a plurality of antennas (11), a phase synthesis unit (13), an output unit (14), and a change unit (15).
  • the plurality of antennas (11) receive the radio signal.
  • the phase synthesizer (13) performs synthesis processing on a plurality of input signals (IS1 to IS3) based on radio signals input from the plurality of antennas (11), and synthesizes for estimating the arrival direction of the radio signal.
  • the output unit (14) outputs the combined signals (SS1 to SS4).
  • the change unit (15) performs a change process for changing at least one element related to the process from the reception of the radio signal to the generation of the combined signal (SS1 to SS4).
  • the phase synthesis unit (13) generates the first composite signal (SS1 to SS4) as the composite signal (SS1 to SS4) before the change processing by the change unit (15). Further, the phase synthesis unit (13) generates the second composite signal (SS1 to SS4) as the composite signal (SS1 to SS4) after the change processing by the change unit (15).
  • the output unit (14) outputs the first composite signal (SS1 to SS4) and the second composite signal (SS1 to SS4).
  • the receiver (2) changes a plurality of composites having different patterns by changing at least one element related to the process from the reception of the radio signal to the generation of the composite signals (SS1 to SS4). Generate signals (SS1 to SS4). Since the patterns of the combined signals (SS1 to SS4) for estimating the arrival direction of the radio signal (positional direction of the transmitter (4)) can be increased, the estimation accuracy of the arrival direction of the radio signal can be improved. ..
  • the receiver (2) according to the second aspect further includes a switching unit (12) in the first aspect.
  • the switching unit (12) switches the electrical connection state between the plurality of antennas (11) and the phase synthesizing unit (13).
  • the changing unit (15) performs a process of controlling the switching unit (12) so as to switch the electrical connection state between the plurality of antennas (11) and the phase synthesizing unit (13) as at least a part of the changing process.
  • the receiver (2) has a plurality of patterns having different patterns by switching the electrical connection state between the plurality of antennas (11) and the phase synthesizer (13) as a part of the change process. Generates synthetic signals (SS1 to SS4). Since the patterns of the combined signals (SS1 to SS4) for estimating the arrival direction of the radio signal (positional direction of the transmitter (4)) can be easily increased, the estimation accuracy of the arrival direction of the radio signal can be easily improved. Can be made to.
  • the phase synthesis unit (13) has a plurality of input units.
  • the plurality of input units are electrically connected to the plurality of antennas (11), and wireless signals are input.
  • the number of the plurality of antennas (11) is equal to or less than the number of the plurality of input units.
  • the receiver (2) since the number of antennas (11) is less than or equal to the number of input units, the receiver (2) can be made compact.
  • the change unit (15) has a plurality of antennas (11) as at least a part of the change process. Performs processing to change the setting related to the time when receiving an unvoiced signal.
  • the receiver (2) changes the settings related to the time (time length, reception timing) when receiving the radio signal, so that the receiver (2) has a plurality of composite signals (SS1 to SS4) having different patterns. To generate. Since the patterns of the combined signals (SS1 to SS4) for estimating the arrival direction of the radio signal (positional direction of the transmitter (4)) can be easily increased, the estimation accuracy of the arrival direction of the radio signal can be easily improved. Can be made to.
  • the phase synthesizer (13) is among the plurality of input signals (IS1 to IS3) in the synthesis process.
  • the process of shifting at least one phase is performed.
  • the change unit (15) performs a process of changing the amount of shifting the phase in the synthesis process as at least a part of the change process.
  • the receiver (2) generates a plurality of composite signals (SS1 to SS4) having different patterns by changing the amount of shifting the phase in the synthesis process. That is, the patterns of the combined signals (SS1 to SS4) for estimating the arrival direction of the radio signal (positional direction of the transmitter (4)) can be easily increased. Therefore, the estimation accuracy of the arrival direction of the radio signal can be easily improved.
  • the plurality of antennas (11) can receive a plurality of radio signals having different frequency bands from each other as radio signals.
  • the change unit (15) performs a process of switching the frequency band of the radio signal to be the target of the synthesis process as at least a part of the change process.
  • the receiver (2) generates a plurality of synthesized signals (SS1 to SS4) having different patterns by switching the frequency band of the radio signal to be the target of the synthesis processing. That is, the patterns of the combined signals (SS1 to SS4) for estimating the arrival direction of the radio signal (positional direction of the transmitter (4)) can be easily increased. Therefore, the estimation accuracy of the arrival direction of the radio signal can be easily improved.
  • each of the plurality of antennas (11) can receive a plurality of different polarized waves as radio signals. is there.
  • the change unit (15) performs a process of switching the type of polarization of the radio signal to be the target of the synthesis process as at least a part of the change process.
  • the receiver (2) generates a plurality of synthetic signals (SS1 to SS4) having different patterns by switching the type of polarization of the radio signal to be the target of the synthesis processing. That is, the patterns of the combined signals (SS1 to SS4) for estimating the arrival direction of the radio signal (positional direction of the transmitter (4)) can be easily increased. Therefore, the estimation accuracy of the arrival direction of the radio signal can be easily improved.
  • configurations according to the second to seventh aspects are not essential configurations for the receiver (2) and can be omitted as appropriate.
  • the receiving system (1) includes a receiver (2) of any one of the first to seventh aspects and an estimation unit (3).
  • the estimation unit (3) estimates the arrival direction of the radio signal based on the first composite signal (SS1 to SS4) and the second composite signal (SS1 to SS4) output from the receiver (2).
  • the receiving system (1) changes a plurality of composites having different patterns by changing at least one element related to the process from the reception of the radio signal to the generation of the composite signals (SS1 to SS4).
  • the transmitter (4a) includes a phase synthesizing unit (23), a plurality of antennas (21), and a changing unit (25).
  • the phase synthesizing unit (23) performs synthesis processing on a plurality of input signals (IS8 to IS11) based on a plurality of original signals (BS1 to BS4) to generate a plurality of radio signals (RS1 to RS3).
  • the plurality of antennas (21) transmit a plurality of radio signals (RS1 to RS3).
  • the change unit (25) performs a change process for changing at least one element related to the process from the reception of the plurality of original signals (BS1 to BS4) to the transmission of the plurality of radio signals (RS1 to RS3).
  • the phase synthesizing unit (23) generates a plurality of first radio signals (RS1 to RS3) as a plurality of radio signals (RS1 to RS3) before the change processing by the change unit (25). Further, the phase synthesizing unit (23) generates a plurality of second radio signals (RS1 to RS3) as a plurality of radio signals (RS1 to RS3) after the change processing by the change unit (25).
  • the plurality of antennas (21) output a plurality of first radio signals (RS1 to RS3) and a plurality of second radio signals (RS1 to RS3).
  • the transmitter (4a) modifies at least one element related to the process from receiving a plurality of original signals (BS1 to BS4) to transmitting a plurality of radio signals (RS1 to RS3). Then, a plurality of radio signals (RS1 to RS3) having different patterns are transmitted. Since the patterns of the plurality of radio signals (RS1 to RS3) can be increased, the accuracy of estimating the position direction of the transmitter (4a) by the receiving system (1a) can be improved.
  • the receiving method includes a receiving step, a first phase synthesis step, a first output step, a change step, a second phase synthesis step, and a second output step.
  • the radio signal is received.
  • the first phase synthesis step a plurality of input signals (IS1 to IS3) based on the radio signal are combined, and the first composite signal (SS1 to SS4) for estimating the arrival direction of the radio signal is generated. To do.
  • the first output step the first composite signals (SS1 to SS4) generated in the first phase synthesis step are output.
  • the change step at least one element related to the processing from the reception step to the first phase synthesis step is changed.
  • a second composite signal (SS1 to SS4) different from the first composite signal (SS1 to SS4) generated in the first phase synthesis step is generated.
  • the second composite signals (SS1 to SS4) generated in the second phase synthesis step are output.
  • a plurality of composite signals (SS1 to SS4) having different patterns are generated by changing at least one element related to the processing from the reception step to the first phase synthesis step. Since the patterns of the combined signals (SS1 to SS4) for estimating the arrival direction of the radio signal (positional direction of the transmitter (4)) can be increased, the estimation accuracy of the arrival direction of the radio signal can be improved. ..
  • the program according to the eleventh aspect causes one or more processors to execute the receiving method of the tenth aspect.
  • a plurality of composite signals (SS1 to SS4) having different patterns are generated by changing at least one element related to the processing from the reception step to the first phase synthesis step. Since the patterns of the combined signals (SS1 to SS4) for estimating the arrival direction of the radio signal (positional direction of the transmitter (4)) can be increased, the estimation accuracy of the arrival direction of the radio signal can be improved. ..

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  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

La présente divulgation aborde le problème de l'amélioration de la précision d'estimation de direction d'un émetteur. Un récepteur (2) comprend une pluralité d'antennes (11), une unité de synthèse de phase (13), une unité de sortie (14) et une unité de changement (15). La pluralité d'antennes (11) reçoivent des signaux radio. L'unité de synthèse de phase (13) effectue un processus de synthèse par rapport à une pluralité de signaux d'entrée (IS1 à IS3) sur la base des signaux radio pour générer des signaux composites (SS1 à SS4). L'unité de changement (15) effectue un processus de changement pour modifier au moins un élément lié aux processus de la réception des signaux radio à la génération des signaux composites (SS1 à SS4). L'unité de synthèse de phase (13) génère des premiers signaux composites (SS1 à SS4) avant le processus de changement effectué par l'unité de changement (15) et génère des seconds signaux composites (SS1 à SS4) après le processus de changement effectué par l'unité de changement (15). L'unité de sortie (14) délivre en sortie des premiers signaux composites (SS1 à SS4) et des seconds signaux composites (SS1 à SS4).
PCT/JP2020/048353 2019-12-24 2020-12-24 Récepteur, système de réception, émetteur, procédé de réception et programme WO2021132430A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013164333A (ja) * 2012-02-10 2013-08-22 Nippon Telegr & Teleph Corp <Ntt> 追尾アンテナ指向方向制御方法および装置
JP2017216567A (ja) * 2016-05-31 2017-12-07 国立大学法人岩手大学 ビーコン装置、該ビーコン装置を用いた方向推定方法、位置推定方法及び通信端末装置
US20180337739A1 (en) * 2017-05-10 2018-11-22 Telefonaktiebolaget Lm Ericsson (Publ) Angle of arrival estimation in a radio communications network

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013164333A (ja) * 2012-02-10 2013-08-22 Nippon Telegr & Teleph Corp <Ntt> 追尾アンテナ指向方向制御方法および装置
JP2017216567A (ja) * 2016-05-31 2017-12-07 国立大学法人岩手大学 ビーコン装置、該ビーコン装置を用いた方向推定方法、位置推定方法及び通信端末装置
US20180337739A1 (en) * 2017-05-10 2018-11-22 Telefonaktiebolaget Lm Ericsson (Publ) Angle of arrival estimation in a radio communications network

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