Wireless power transmission device, wireless power transmission system, control device and control method

Abstract

To provide a wireless power transmission device which can perform phase correction of a microwave for power transmission to a structure error (step=distance difference) between power transmission antenna panels.SOLUTION: A wireless power transmission device according to one embodiment of the present invention includes a power transmission antenna panel group. The power transmission antenna panel group includes a plurality of power transmission antenna panels respectively having a pilot signal reception antenna, a power transmission antenna module, and a demodulator which detects a pilot signal. The plurality of power transmission antenna panels include: the first power transmission antenna panel which becomes the reference of panel position and phase correction; and the second power transmission antenna panel that becomes the object of phase correction. The second power transmission antenna panel calculates a phase difference between a first demodulation wave being a demodulation wave of the pilot signal detected by the first power transmission antenna panel and a second demodulation wave being the demodulation wave of the pilot signal detected by the second power transmission antenna panel, and calculates a phase correction value of the power transmission microwave on the basis of the phase difference.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a wireless power transmission device, and more specifically, to a control method for correcting structural errors in a large-diameter (composed of multiple antenna panels connected together) phased array antenna for power transmission, which is necessary for long-distance wireless power transmission using microwaves, a microwave beam control device using the same, and a microwave wireless power transmission system equipped with the same. [Background technology]

[0002] There is a system concept called "Space Solar Power Systems (SSPS)" that deploys huge solar panels in space to generate solar power and transmits the generated electrical energy to the ground by microwave radio waves. This concept was first proposed by Dr. Glaser of the United States in 1968 (Non-Patent Document 1), and a U.S. patent was issued thereafter (Patent Document 1). The basic configuration of SSPS is composed of a solar power satellite (SPS) in space equipped with a solar power generation panel and a power transmission antenna, and a ground power receiving facility equipped with a power receiving antenna array and the like. SSPS can generate power day and night by placing a solar power satellite in a geostationary orbit at an altitude of about 36,000 km, and converts the electrical energy into microwaves of approximately 10 GHz or less (a frequency band called the "radio wave window" that is almost not affected by energy absorption by water molecules in clouds or precipitation), and transmits microwave wireless power to a power receiving facility on the ground. Therefore, conceptually, it is expected to be a "new sustainable power source" that can stably supply renewable energy to the ground without being affected by weather. Toward the realization of SSPS, technological development has been underway for long-distance wireless power transmission using microwaves. In this technology, when performing "long-distance wireless power transmission" from an orbiting solar power satellite to a power receiving facility on the ground, a promising method is thought to be to transmit a pilot signal from the power receiving facility (the power receiving antenna side) to the solar power satellite (the power transmitting antenna side), have the solar power satellite (the power transmitting antenna side) detect the direction of arrival of the signal with high accuracy, and orient a microwave power transmission beam so that it is reflected back in the same direction (known as the retrodirective method).

[0003] In addition, in order to transmit long distance wireless power from space to the ground with a high efficiency suitable for practical use, the aperture diameter of the power transmission antenna that radiates microwaves is inevitably large, on the order of kilometers, due to the characteristics of radio waves (Non-Patent Document 2). It is conceivable that such a large aperture power transmission antenna would be constructed as a single planar phased array antenna (= a group of power transmission antenna panels) in which a large number of rigid antenna panels equipped with phased array antennas are combined, but in space, due to the effects of disturbances such as gravity gradient torque and thermal distortion, the power transmission antenna as a whole cannot maintain a perfect structural plane. Therefore, it is inevitable that the positions of the individual power transmission antenna panels will deviate from the reference, and microwave phase correction that takes this into account is essential for highly accurate pointing control of the beam of power transmission microwaves.

[0004] As one of the means for correcting the structural error (step difference = distance difference) between multiple power transmitting antenna panels, a method of applying the rotating-element electric-field vector method (REV method) (Non-Patent Document 3) has been considered (Non-Patent Document 4). The REV method is originally a method used for calibrating the variation in the electrical characteristics of antenna elements and power feeding circuits, and focuses on the variable phase shifter connected to each element of a phased array antenna, measures the change in amplitude of the array antenna composite electric field when the phase of one element is changed from 0 degrees to 360 degrees in the array operation state, and obtains the necessary amplitude and phase of the microwave radiated from the element. By utilizing the fact that the electric field of each power transmitting antenna panel unit changes cosine-like when there is a structural error between the power transmitting antenna panels, the phase at which the composite electric field of the power transmitting microwave is maximized is read as a correction value on the power receiving equipment side, and this is given to the phase shifter in the stage before the first-stage high-output amplifier in each power transmitting antenna panel, thereby electrically correcting the structural error. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] U.S. Patent No. 3,781,647 [Non-patent literature]

[0006] [Non-Patent Document 1] Peter E. Glaser, "Power from the Sun: It's Future", Science, Vol.162, pp.857-886, 1968 [Non-Patent Document 2] William C. Brown, "Beamed Microwave Power Transmission and its Application to Space", IEEE trans. on Microwave Theory and Techniques., Vol.40, No.6, pp.1239-1250, 1992. [Non-Patent Document 3] Kiyoji Mano, Takashi Katagi, "A method for measuring the element amplitude and phase of a phased array antenna - Element electric field vector rotation method -", IEICE Transactions on Electronics and Communication Engineers, vol.J65-B, no.5, pp.555-560, March 1982. [Non-Patent Document 4] Katsuyuki Makino, Daisuke Kamidoi, Mitsuhiro Nakadai, Masanobu Yajima, Kazuo Ohashi, Tomohiro Takahashi, Takuro Sasaki, Yukihiro Homma, "Development of a High-Precision Microwave Beam Steering Control System and Its Technical Demonstration Test for the Realization of SSPS", Technical Report of the Institute of Electronics, Information and Communication Engineers, SANE 2015-22, pp.37-42, June 2015. Summary of the Invention [Problem to be solved by the invention]

[0007] To transmit microwave power over long distances efficiently enough for practical use, it is necessary to enlarge the diameter of the transmitting antenna according to the transmission distance. However, a large-diameter transmitting antenna is constructed by combining many rigid antenna panels (antenna panel group). Therefore, in space, structural errors such as steps occur between the antenna panels due to disturbances such as gravity gradient torque and thermal distortion. When the REV method is applied to phase correction for structural errors of such a large-diameter transmitting antenna (planar phased array antenna), the above-mentioned operations must be performed (sequentially) for each rigid antenna panel, and the larger the transmitting antenna, the more time is required. During this time, effective microwave wireless power transmission is suspended, and the system operating rate decreases. In addition, although the phase correction method using the REV method allows for precise phase correction corresponding to the number of bits of the phase shifter, this method is designed for a power generation satellite in a geostationary orbit, where the relative positional relationship between the power generation satellite in orbit and the ground power receiving equipment does not change, and therefore, in principle, it is difficult to apply this method to a power generation satellite in a medium orbit or other Earth orbit.

[0008] In view of the above circumstances, an object of the present invention is to provide a wireless power transmission device, a wireless power transmission system, a control device, and a control method that can perform phase correction of microwaves for power transmission to compensate for structural errors (step differences = distance differences) between power transmission antenna panels at specific time intervals, even in a power generation satellite in an Earth orbit such as a medium orbit, without suspending effective microwave wireless power transmission. [Means for solving the problem]

[0009] A wireless power transmitting device according to an embodiment of the present invention includes a group of power transmitting antenna panels having a planar structure. The group of power transmitting antenna panels includes a plurality of power transmitting antenna panels each having a pilot signal receiving antenna for receiving a pilot signal transmitted as a modulated wave from a power receiving device, a plurality of power transmitting antenna modules for emitting microwaves, and a demodulator for detecting the pilot signal received by the pilot signal receiving antenna. The plurality of power transmitting antenna panels are composed of a first power transmitting antenna panel having a first signal processing device and serving as a reference for panel position and phase correction, and a second power transmitting antenna panel having a second signal processing device and serving as a target for phase correction. The second signal processing device includes a phase correction calculation section and a phase control signal generation section. The phase correction calculation unit calculates a phase difference between a first demodulated wave, which is a demodulated wave of the pilot signal detected by the first transmitting antenna panel, and a second demodulated wave, which is a demodulated wave of the pilot signal detected by the second transmitting antenna panel, and calculates a phase correction value of the transmitting microwave based on the phase difference. The phase control signal generating unit controls phases of microwaves radiated from the plurality of antenna modules in the second power transmitting antenna panel based on the phase correction value.

[0010] A microwave wireless power transmission system according to an embodiment of the present invention includes a power receiving device and a wireless power transmitting device. The power receiving device includes a rectenna array and a pilot signal transmitting antenna that transmits a pilot signal transmitted as a modulated wave. The wireless power transmitting device includes a planar power transmitting antenna panel group including a plurality of power transmitting antenna panels each having a pilot signal receiving antenna for receiving the pilot signal, a plurality of power transmitting antenna modules for radiating microwaves to the receiver array, and a demodulator for detecting the pilot signal received by the pilot signal receiving antenna. The power transmitting antenna panel group includes a first power transmitting antenna panel that serves as a reference for panel position and phase correction, and a second power transmitting antenna panel that is the target of phase correction. The second power transmitting antenna panel includes a signal processing device having a phase correction calculation unit and a phase control signal generation unit. The phase correction calculation unit calculates a phase difference between a first demodulated wave, which is a demodulated wave of the pilot signal detected by the first transmitting antenna panel, and a second demodulated wave, which is a demodulated wave of the pilot signal detected by the second transmitting antenna panel, and calculates a phase correction value of the transmitting microwave based on the phase difference. The phase control signal generating unit controls phases of microwaves radiated from the multiple power transmitting antenna modules in the second power transmitting antenna panel based on the phase correction value.

[0011] A control device according to one embodiment of the present invention includes a plurality of power transmitting antenna panels, each of which has a pilot signal receiving antenna that receives a pilot signal transmitted as a modulated wave from a power receiving device, a plurality of power transmitting antenna modules that radiate microwaves, and a demodulator that detects the pilot signal received by the pilot signal receiving antenna, and the plurality of power transmitting antenna panels are composed of a first power transmitting antenna panel that serves as a reference for panel position and phase correction, and a second power transmitting antenna panel that is the target of phase correction.The control device performs phase correction of radiated microwaves for structural errors of a group of planar power transmitting antenna panels, and is equipped with a phase correction calculation unit and a phase control signal generation unit. The phase correction calculation unit calculates a phase difference between a first demodulated wave, which is a demodulated wave of the pilot signal detected by the first transmitting antenna panel, and a second demodulated wave, which is a demodulated wave of the pilot signal detected by the second transmitting antenna panel, and calculates a phase correction value of the transmitting microwave based on the phase difference. The phase control signal generating unit controls phases of microwaves radiated from the plurality of antenna modules in the second power transmitting antenna panel based on the phase correction value.

[0012] A control method according to one embodiment of the present invention includes a plurality of power transmitting antenna panels each having a pilot signal receiving antenna that receives a pilot signal transmitted as a modulated wave from a power receiving device, a plurality of power transmitting antenna modules that radiate microwaves, and a demodulator that detects the pilot signal received by the pilot signal receiving antenna, and the plurality of power transmitting antenna panels are composed of a first power transmitting antenna panel that serves as a reference for panel position and phase correction, and a second power transmitting antenna panel that is a target for phase correction, the control method comprising: calculating a phase difference between a first demodulated wave that is a demodulated wave of the pilot signal detected by the first power transmitting antenna panel and a second demodulated wave that is a demodulated wave of the pilot signal detected by the second power transmitting antenna panel; A phase correction value of the microwaves radiated from the plurality of antenna modules in the second power transmitting antenna panel is calculated based on the phase difference. Effect of the Invention

[0013] According to the present invention, even in a situation where the relative positional relationship between the transmitter and receiver changes, such as the positional relationship between a solar power satellite orbiting in a medium orbit and a ground power receiving facility, it is possible to quickly (simultaneously) perform microwave phase correction for structural errors (step difference = distance difference) in a planar phased array antenna for power transmission (group of power transmission antenna panels) at the timing when the transmitter and receiver antennas face each other directly (AZ = 0) without interrupting effective microwave wireless power transmission. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a basic block diagram showing the configuration of a microwave distance wireless power transmission system according to one embodiment (space solar power generation system) of the present invention. [Diagram 2] FIG. 1 is a schematic diagram of a microwavelength long-distance wireless power transmission system according to one embodiment of the present invention (space solar power generation system), and is also a schematic diagram showing a state in which each power transmission antenna panel constituting a large-scale planar power transmission phased array antenna (power transmission antenna panel group) has a structural error (distance difference) such as a step from a reference plane. [Diagram 3] 1 is a schematic diagram of a power transmitting antenna panel and a power transmitting antenna array constituting the power transmitting antenna panel; [Figure 4] 2 is a basic block diagram showing the configuration of a beam control device mounted on a first power transmitting antenna panel and a second power transmitting antenna panel. FIG. [Diagram 5] 2 is a basic block diagram showing an outline of the circuit configuration of a beam control device mounted on the power transmitting antenna panel. FIG. [Figure 6] 10 is a flowchart showing an example of a processing procedure executed by a beam control device mounted on a first power transmitting antenna panel and a second power transmitting antenna panel. [Figure 7]5 is a conceptual diagram illustrating microwave phase correction in each power transmitting antenna panel. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0016] [System Overview] Fig. 1 is a basic block diagram showing the configuration of a microwave distance wireless power transmission system 100 (space solar power generation system) according to one embodiment of the present invention. Fig. 2 is a schematic diagram of the microwave distance wireless power transmission system 100, showing a state in which each of the power transmission antenna panels 40 constituting a planar power transmission phased array antenna (power transmission antenna panel group) 12 has a structural error (step difference = distance difference) from a reference plane.

[0017] The microwave distance wireless power transmission system 100 of this embodiment includes a wireless power transmitting device 10, a power receiving device 20, and a beam control and management device 30.

[0018] The power receiving device 20 is installed at a ground power receiving site. The power receiving device 20 has a power receiving antenna (rectenna array) 21 that receives a microwave beam B transmitted from the wireless power transmitting device 10, and a pilot signal transmitting antenna 65 that transmits a pilot signal P to the wireless power transmitting device 10.

[0019] The receiving antenna (rectenna array) 21 is composed of an antenna portion that receives the microwave beam B, and a rectenna array that includes a rectifier circuit that converts the received microwave beam B into DC power. The pilot signal transmitting antenna 65 radiates a pilot signal P (e.g., a frequency of 2.45 GHz). The beam control device 80C is configured to be capable of transmitting a modulated wave (e.g., an amplitude modulated wave amplitude-modulated at a modulation frequency of 100 MHz) using the pilot signal P as a carrier wave. The frequency of the carrier wave, the modulation method, and the modulation frequency are of course not limited to these examples. The pilot signal transmitting antenna 65 is disposed in the center of the rectenna array constituting the power receiving antenna 21, but is not limited to this.

[0020] The wireless power transmitting device 10 is an integrated spacecraft (power generating satellite) with a solar power generating function. The wireless power transmitting device 10 has a power generating unit 11 that converts sunlight into electric power, and a large-diameter power transmitting antenna (power transmitting antenna panel group) 12 that forms and directs a microwave beam toward a power receiving antenna (rectenna array) 21 of a power receiving device 20. The wireless power transmitting device 10 may be a power transmitting satellite in a geostationary orbit, or a power transmitting satellite that orbits the Earth in a non-geostationary orbit. In this embodiment, the wireless power transmitting device 10 is configured as a power transmitting satellite in a low or medium orbit orbit orbiting above the equator, for example. As shown in FIG. 2, the distance between the wireless power transmitting device 10 and the power receiving device 20 is within the Fresnel region, and more specifically, when the aperture diameter of the large-diameter power transmitting antenna (power transmitting antenna panel group) 12 is A and the wavelength of the microwave to be transmitted and received is λ, the distance is approximately 2A. 2 / λ or less.

[0021] The large-diameter power transmitting antenna (power transmitting antenna panel group) 12 is composed of a combination of multiple power transmitting antenna panels 40 (40A, 40B) as shown in Fig. 1 and Fig. 2. As described below, each power transmitting antenna panel 40 has a power transmitting antenna subarray 51 including a receiving antenna element (pilot signal receiving antenna) that receives a pilot signal P and multiple power transmitting antenna modules that radiate microwaves (see Fig. 3). The multiple power transmitting antenna panels 40 are flexibly coupled to each other on a predetermined reference plane to form a rectangular large-diameter power transmitting antenna (power transmitting antenna panel group) 12 with a side length of the order of kilometers.

[0022] The power generation unit 11 has a solar power generation module. The solar power generation modules are arranged on each of the multiple power transmitting antenna panels 40. Typically, the solar power generation modules are arranged on the surface of the power transmitting antenna panel 40 opposite to the antenna formation surface on which the antenna element that radiates microwaves is mounted, but the solar power generation modules may also be arranged on the surface on which the antenna element that radiates microwaves is mounted, that is, on both sides of the power transmitting antenna panel 40. This provides a large power generation surface equivalent in area to that of the large-diameter power transmitting antenna (power transmitting antenna panel group) 12.

[0023] The beam control control device 30 is part of a power generation device (wireless power transmission device 10) that orbits the Earth together with the large-diameter power transmission antenna (power transmission antenna panel group) 12. The beam control control device 30 is capable of wireless communication with the large-diameter power transmission antenna (power transmission antenna panel group) 12, and transmits basic information required for forming a microwave beam B, such as time synchronization and phase synchronization, to each of the power transmission antenna panels 40 that constitute the large-diameter power transmission antenna (power transmission antenna panel group) 12.

[0024] [Large-diameter power transmission antenna (power transmission antenna panel group)] Next, a detailed description will be given of the large-diameter power transmitting antenna (power transmitting antenna panel group) 12. The large-diameter power transmitting antenna (power transmitting antenna panel group) 12 is composed of a combination of a plurality of power transmitting antenna panels 40 as shown in FIG. FIG. 3 is a schematic diagram of the antenna formation surface, which is the surface on one side (the surface facing the earth) of the power transmitting antenna panel 40. As shown in FIG.

[0025] The power transmitting antenna panels 40 are arranged in a matrix in the azimuth direction (X-axis direction in FIG. 3) and elevation direction (Y-axis direction in FIG. 3) so that the large-diameter power transmitting antenna (power transmitting antenna panel group) 12 is formed as a single plane. In order to protect the large-diameter power transmitting antenna (power transmitting antenna panel group) 12 from disturbances such as gravity gradient torque and thermal distortion, the connection between two adjacent power transmitting antenna panels 40 is a flexible connection that allows a predetermined amount of relative displacement between them.

[0026] Each power transmitting antenna panel 40 has the same configuration, and is a power transmitting antenna array composed of a collection of multiple power transmitting antenna subarrays arranged in a matrix in the X-axis direction and the Y-axis direction (hereinafter, the power transmitting antenna panel 40 is also referred to as the power transmitting antenna array 40). Each power transmitting antenna array 40 is a rigid body (a completely flat surface) and is a minimum component that does not undergo structural deformation.

[0027] The power transmitting antenna array 40 is composed of a plurality of (15×15 in this example) power transmitting antenna subarrays 51 arranged in a matrix as shown in Fig. 3. In this example, 15 power transmitting antenna subarrays 51 are arranged in a matrix in each of the X-axis direction and the Y-axis direction to form one power transmitting antenna array 40. Each power transmitting antenna subarray 51 is composed of a plurality of (9 (3×3) in this example) power transmitting antenna modules (one module has four antenna elements in this example) 53 arranged in a matrix.

[0028] One of the multiple transmitting antenna subarrays 51 is configured as a transmitting / receiving antenna subarray 52 including a pilot signal receiving antenna 60 capable of receiving a pilot signal P. The transmitting / receiving antenna subarray 52 is preferably located at the center of the transmitting antenna array 40. In the example shown in FIG. 3, the transmitting antenna subarray 51 arranged at the center of the transmitting antenna array 40 is configured as the transmitting / receiving antenna subarray 52.

[0029] 3, the transmitting / receiving antenna subarray 52 is composed of a plurality of antenna elements arranged in a matrix. More specifically, the transmitting / receiving antenna subarray 52 has four power transmitting antenna modules 53 (in this example, one module has four antenna elements) and five pilot signal receiving antennas 60. The power transmitting antenna modules 53 are disposed at the four corners of the transmitting / receiving antenna subarray 52.

[0030] The five pilot signal receiving antennas 60 are antenna elements for receiving pilot signals P, and include a pair of first receiving antenna elements (60A, 60B) arranged in the azimuth direction (X direction) and a pair of second receiving antenna elements (60A, 60B) arranged in the elevation direction (Y axis direction) as shown in Fig. 2. The first receiving antenna elements (60A, 60B) and the second receiving antenna elements (60A, 60B) are arranged opposite each other in the X axis direction and the Y axis direction, respectively, with the receiving antenna element 60C located at the center therebetween, as shown in Fig. 2.

[0031] The power transmitting antenna modules 53 (one module having four antenna elements in this example) arranged at the positions of the five pilot signal receiving antennas 60 correspond to the power transmitting antenna subarray 51.

[0032] In this embodiment, the multiple power transmitting antenna panels 40 configured as above are classified into two groups: a first power transmitting antenna panel 40A and a second power transmitting antenna panel 40B. The first power transmitting antenna panel 40A is a power transmitting antenna panel that serves as a reference for panel position and phase correction among the multiple power transmitting antenna panels 40, and there is only one of them. The second power transmitting antenna panel 40B is a power transmitting antenna panel that is a target for phase correction, and in this embodiment, it is all power transmitting antenna panels other than the first power transmitting antenna panel 40A. The first power transmitting antenna panel 40A is located, for example, in the center of the large-diameter power transmitting antenna (power transmitting antenna panel group) 12. The first power transmitting antenna panel 40A and the second power transmitting antenna panel 40B have a common basic configuration, but differ in the configuration of the signal processing device 90 in the beam control device 80, as will be described later.

[0033] FIG. 5 is a basic block diagram showing an outline of the circuit configuration of the beam control device 80 mounted on each power transmitting antenna panel 40. As shown in FIG. The beam control device 80 mounted on each transmitting antenna panel 40 has a microwave oscillator 71, a first phase shifter 72, a first amplifier 73, a second phase shifter 74, and a second amplifier 75, as shown in the figure.

[0034] The microwave oscillator 71 oscillates microwaves at a frequency of 5.8 GHz (wavelength 5.17 cm) in a microwave band of, for example, 3 GHz to 30 GHz. The first phase shifter 72 collectively adjusts the phase of the microwaves radiated from the antenna elements of each power transmitting antenna module 53 for each power transmitting antenna panel. The second phase shifter 74 is composed of a plurality of phase shifters that individually adjust the phase of the microwaves radiated from the antenna elements of each power transmitting antenna module 53. The second amplifier 75 amplifies the microwaves radiated from the antenna elements of each power transmitting antenna module 53.

[0035] The beam control device 80 controls the first phase shifter 72 and the second phase shifter 74 based on the pilot signal P received by the pilot signal receiving antenna 60. The beam control device 80 obtains the following two pieces of information from the pilot signal P received by the pilot signal receiving antenna 60.

[0036] The first information is information for calculating the direction of arrival of the pilot signal P. The beam control device 80 calculates a sum signal Σ(A+B) of the receiving antenna elements 60A and 60B and a difference signal Δ(AB) between the receiving antenna elements 60A and 60B from signals obtained at the first receiving antenna element (60A, 60B) in the X-axis direction and at the second receiving antenna element (60A, 60B) in the Y-axis direction. The normalized error signal (Δ / Σ) of the sum signal Σ and the difference signal Δ is expressed as an angle function.

[0037] The beam control device 80 detects the arrival direction of the pilot signal P in the azimuth direction and the elevation direction by generating normalized error signals for each of the X-axis direction and the Y-axis direction. Next, the beam control device 80 controls the second phase shifter 74 so that the beam formed by the microwaves radiated from the antenna elements of each power transmitting antenna module 53 is directed in the same direction as the arrival direction of the pilot signal P. This control is performed in each power transmitting antenna panel 40 based on a time synchronization signal and a phase synchronization signal transmitted from the beam control control device 30.

[0038] The second information is information for calculating a phase correction value for correcting a structural error (step difference=distance difference) between the power transmitting antenna panels 40.

[0039] The large-diameter power transmitting antenna (power transmitting antenna panel group) 12 is constructed by flexibly connecting a large number of power transmitting antenna panels 40. Therefore, when disturbances such as gravity gradient torque and thermal distortion are received and exceed the allowable level, the antenna formation surface of the large-diameter power transmitting antenna (power transmitting antenna panel group) 12 as a phased array antenna cannot maintain a completely flat structure (see FIG. 2). To control the beam direction of the power transmitting microwaves with extremely high precision, it is necessary to take into account that each power transmitting antenna panel 40 may deviate from the reference position, and to perform electrical correction control (microwave phase correction control) based on this.

[0040] Therefore, in this embodiment, as described below, a modulated signal is detected (demodulated) from a pilot signal P received by a pilot signal receiving antenna element 60, and an integral time is calculated from the ratio of the integral value of the demodulated full-wave rectified waveform to the time integral value equivalent to the structural error (step = distance difference) of each transmitting antenna panel 40. A phase difference is obtained from the integral time, and this is replaced with the distance difference to calculate a phase correction value of the transmitting microwave.

[0041] The beam control device 80 controls the second phase shifter 74 based on the calculated normalized error signal (Δ / Σ). This makes it possible to direct a beam formed by microwaves radiated from the antenna elements of the power transmitting antenna modules 53 of the power transmitting antenna panel 40 toward the power receiving antenna (rectenna array) 21 of the power receiving device 20.

[0042] The beam control device 80 further controls the first phase shifter 71 based on the calculated correction value. This makes it possible to realize phase correction that compensates for structural errors (step differences=distance differences) between the power transmitting antenna panels 40.

[0043] The beam control device 80 will be described in detail below. Here, the beam control device 80 mounted on the first power transmitting antenna panel 40A is referred to as the first beam control device 80A, and the beam control device 80 mounted on the second power transmitting antenna panel 40B is referred to as the second beam control device 80B. In addition, the beam control device 80 mounted on the power receiving device 20 is referred to as the third beam control device 80C.

[0044] [First beam control device] 4 is a block diagram showing the configuration of the first beam control device 80A and the second beam control device 80B. The first beam control device 80A has a pilot signal receiving antenna 60, a tracking receiver 81A, a demodulator 82A, a radio transmission / reception unit 83A, and a signal processing device 90A (first signal processing device).

[0045] The wireless transmitting / receiving unit 83A is a wireless communication module for transmitting and receiving a time synchronization signal, a phase correction synchronization signal, and the like to and from the beam control control device 30.

[0046] The demodulator 82A constitutes a detection circuit and the like that demodulates (detects) a modulated signal from a pilot signal P received by the receiving antenna element 60 of the first power transmitting antenna panel 40A. The demodulator 82A includes a rectifier circuit that full-wave rectifies the demodulated wave detected from the pilot signal P. The demodulator 82A may be constituted by hardware or software. When the demodulator 82A is constituted by software, the demodulator 82A may be constituted as a part of the signal processing device 90A.

[0047] The tracking receiver 81A is configured to obtain a sum signal and a difference signal of the pilot signal P as the above-mentioned first information from the pilot signal P received by the pilot signal receiving antenna 60, and to execute various arithmetic processing based on this to calculate the arrival direction of the pilot signal P. The calculated information on the arrival direction of the pilot signal P is output to a phase control signal generating unit 93A of the signal processing device 90A.

[0048] The signal processing device 90A is configured with a computer having a CPU and a memory, and has as its functional blocks a reference signal generating section 91 and a phase control signal generating section 93A.

[0049] The reference signal generating unit 91 is mounted only on the first power transmitting antenna panel 40A. The reference signal generating unit 91 is typically configured with a computer having a CPU and a memory, and generates a reference time signal (trigger signal) described later based on the output of the demodulator 82A.

[0050] The phase control signal generating unit 93A generates and indicates the phase value of the microwave radiated from the antenna elements (multiple power transmitting antenna modules 53) mounted on the first power transmitting antenna panel 40A, based on information on the direction of arrival of the pilot signal P, in order to orient the beam center of the power transmitting microwave in the same direction as the direction of arrival of the pilot signal P.

[0051] [Second beam control device] On the other hand, as shown in FIG. 4, the second beam control device 80B has a pilot signal receiving antenna element 60, a tracking receiver 81B, a demodulator 82B, a radio transmitting / receiving unit 83B, and a signal processing device 90B (second signal processing device).

[0052] The wireless transmission / reception unit 83B is a wireless communication module for transmitting and receiving a time synchronization signal, a phase correction synchronization signal, and the like to and from the beam control control device 30.

[0053] The demodulator 82B constitutes a detection circuit and the like that demodulates (detects) a modulated signal from a pilot signal P received by the receiving antenna element 60 of the second power transmitting antenna panel 40B. The demodulator 82B includes a rectifier circuit that full-wave rectifies the demodulated wave detected from the pilot signal P. The demodulator 82B may be configured as hardware or software. When the demodulator 82B is configured as software, the demodulator 82B may be configured as a part of the signal processing device 90B.

[0054] The tracking receiver 81B is configured to obtain a sum signal and a difference signal of the pilot signal P as the above-mentioned first information from the pilot signal P received by the receiving antenna element 60, and to execute various arithmetic processing based on this to calculate the arrival direction of the pilot signal P. The calculated information on the arrival direction of the pilot signal P is output to a phase control signal generating unit 93B of the signal processing device 90B.

[0055] The signal processing device 90B is configured with a computer having a CPU and a memory, and has as its functional blocks a phase correction calculation section 92 and a phase control signal generation section 93B.

[0056] The phase correction calculation unit 92 is configured to calculate a phase difference between a demodulated wave (first demodulated wave) detected by the demodulator 82A of the first beam control device 80A and a demodulated wave (second demodulated wave) detected by the demodulator 82B of the second beam control device 80B based on the reference time signal (trigger signal) generated by the first beam control device 80A, and to execute various calculation processes for calculating a phase correction value of the power transmission microwave based on this phase difference. The phase correction calculation unit 92 outputs information on the calculated phase correction value of the power transmission microwave to the phase control signal generation unit 93B.

[0057] The phase control signal generating unit 93B generates a phase control signal for controlling the phase of the microwave radiated from the antenna elements (multiple power transmitting antenna modules 53) mounted on the second power transmitting antenna panel 40B based on information on the direction of arrival of the pilot signal P calculated by the tracking receiver 81B and information on the phase correction value of the power transmitting microwave calculated by the phase correction calculation unit 92, and instructs the first phase shifter 72 on the phase difference corresponding to the generated phase control signal.

[0058] The beam control device 80 will be described in detail below together with the operation of the large-diameter power transmitting antenna (power transmitting antenna panel group) 12. In the following description, the first power transmitting antenna panel 40A is also referred to as the reference panel 40A, and the second power transmitting antenna panel 40B is also referred to as the panels 40B1, . . . 40B. n It is also called.

[0059] [Operation of large-diameter power transmission antenna (power transmission antenna panel group)] FIG. 6 is a flowchart showing an example of a processing procedure executed by the beam control device 80.

[0060] The first beam control device 80A and the second beam control device 80B detect whether or not a pilot signal P transmitted from the third beam control device 80C has been received. The presence or absence of reception of a pilot signal is detected, for example, by checking whether the sum signal Σ(A+B) of the pilot signal receiving antenna 60 or the output (reception level) of the receiving antenna element 60C is equal to or higher than a predetermined value.

[0061] Here, the large-diameter power transmitting antenna (power transmitting antenna panel group) 12 is disposed in a far-field region of the pilot signal transmitting antenna where the wavefront of the pilot signal P propagating through space is approximated to a plane wave. For this reason, each of the power transmitting antenna panels 40 (40A, 40B1, ... 40B) of the large-diameter power transmitting antenna (power transmitting antenna panel group) 12 is n When the antenna forming surfaces of the power transmitting antenna panels 40 (40A, 40B1, ... 40B) are aligned on a reference plane, n ) receives pilot signal P in phase (equal phase surface) (step 101).

[0062] In addition, each of the power transmission antenna panels 40 (40A, 40B1, ... 40B n In order for the pilot signal P to be received in phase (equal phase surface) by the pilot signal receiving antenna 60 of the large-diameter power transmitting antenna (power transmitting antenna panel group) 12, the normal direction of the large-diameter power transmitting antenna (power transmitting antenna panel group) 12 needs to be directed toward the power receiving device 20 on the ground. Therefore, when the large-diameter power transmitting antenna (power transmitting antenna panel group) 12 is an orbiting satellite, the power receiving device 20 (pilot signal transmitting antenna 65) transmits the pilot signal P toward the zenith direction so as to receive it at the moment when the large-diameter power transmitting antenna (power transmitting antenna panel group) 12 is located in the zenith direction (at the timing when the positional relationship of the angle in the azimuth direction becomes zero).

[0063] When the first beam control device 80A and the second beam control device 80B receive the pilot signal P, they demodulate (detect) the modulated signal from the pilot signal P and monitor the demodulated full-wave rectified waveform (step 102).

[0064] FIG. 7 shows demodulated waveforms of pilot signals P detected by the first power transmitting antenna panel 40A and the second power transmitting antenna panel 40B. Here, the first power transmitting antenna panel 40A, which is a reference panel, and the multiple second power transmitting antenna panels 40B (40B1, . . . 40B n ) show the demodulated waveforms of two arbitrary panels (hereinafter also referred to as panel 40B1 and panel 40B2, respectively).

[0065] When the reference panel 40A receives the pilot signal P, the first beam control device 80A transmits a reference time signal indicating the timing at which the instantaneous value of the demodulated wave waveform becomes zero to the beam control control device 30 (step 103). The reference time signal is a trigger signal rather than time information. Upon receiving the reference time signal, the beam control control device 30 wirelessly distributes the reference time signal simultaneously to all second power transmitting antenna panels 40B, including the panels 40B1 and 40B2. This allows all second power transmitting antenna panels 40B to receive the reference time signal simultaneously, regardless of their distance from the first power transmitting antenna panel 40A. While the reference panel 40A is receiving the pilot signal P, it continuously broadcasts a reference time signal (a trigger signal, not time information).

[0066] The second beam control device 80B acquires a reference time signal (step 104). The reference time signal is acquired by the phase correction calculation unit 92 via the wireless transmission / reception unit 83B (see FIG. 4). The second beam control device 80B (signal processing device 90B) executes a phase difference calculation process based on the acquired reference time signal. In this phase difference calculation process, a phase difference is calculated between a first demodulated wave waveform detected from the pilot signal P by the reference panel 40A (first power transmitting antenna panel 40A) and a second demodulated wave waveform detected from the pilot signal P by each second power transmitting antenna panel 40B.

[0067] (Phase difference calculation process) In the phase difference calculation process, in this embodiment, the second power transmitting antenna panel 40B (each of the panels 40B1, 40B2, ... 40B n ), the second demodulated waveform is integrated from the time the reference time signal is received until the instantaneous value of the second demodulated waveform becomes zero, and based on the integral value, one wavelength of the transmission microwave (λ in this example) is calculated. P The phase difference between the first demodulated wave waveform and the second demodulated wave waveform in the physical space (distance) PS corresponding to the distance (wavelength) of the antenna 11 (wavelength 110 mm, frequency 5.8 GHz) is calculated.

[0068] Referring to the schematic diagram of FIG. 7, the length of the horizontal axis of the physical space (distance) PS is one wavelength of the power transmission microwave (in this example, λ P = 5.17 cm), which corresponds to the time domain enclosed by the two-dot chain line in the figure. Also, the length of the horizontal axis of this physical space (distance) PS (= λ P ) is the demodulated waveform λ m Using λ m For example, if the demodulated waveform is a 100MHz sine wave, k = 58. m / 2=150cm, λ P = λ m Since / 58=5.17 cm, the temporal resolution of the physical space (distance) PS shown in FIG. 7 is higher than that of the time domain to the left of it.

[0069] In the second power transmitting antenna panel 40B (panels 40B1, 40B2) shown in the physical space (distance) PS, there is a time difference between the reference time (the time when the reference time signal is acquired) and the timing when the instantaneous value of the second demodulated wave waveform becomes zero. For panel 40B1, the instantaneous value becomes zero after the reference time signal is acquired, and for panel 40B2, the instantaneous value becomes zero before the reference time signal is acquired. This is because the demodulated wave waveform in panel 40B1 has a delayed phase (=ωΔt1=2πf m Δt B1 ), and in panel 40B2, the demodulated waveform of the reference panel 40A is advanced in phase (=ωΔt B2 =2πf m Δt B2 The phase difference between these demodulated waveforms is the wavelength λ m Based on the small distance difference ΔL in the physical space (distance) PS B1 , ΔL B2 and the phase difference of the transmission microwave wavelength corresponding to this minute distance difference is used as the phase correction value.

[0070] Below, the phase difference ΔL B1 , ΔL B2 The calculation method will be described below.

[0071] First, the time integral value S for a half cycle of the demodulated waveform all (Time 0 to T / 2, T is the period of the demodulated waveform) and the demodulated waveform is one wavelength of the transmitted microwave (in this example, λ P The integral value S0 of the time from 0 to T / k (from the time when the instantaneous value becomes 0 to the amplitude level after T / k) passing through a physical space (distance) PS of 100 Hz (=5.17 cm) is calculated in advance (assumed to be known).

[0072] The time integration of the demodulated waveform on panel 40B1, which is a delayed phase relative to the demodulated waveform on reference panel 40A, begins upon receipt of a reference time signal (step 104), and ends when the instantaneous value of the demodulated waveform becomes zero (step 105). The integration time at that time is t B1 , the integral value is S B1 Then, the integral value S B1 , S0 and S all is the amplitude of the demodulated waveform V m , the frequency is f m Then, they are calculated using the following equations (1) to (3), respectively.

[0073]

number

number

number

[0074] Here, t B1 If <(T / 4), the integral ratio S B1 / S0 (S0 is known, S B1 is the actual measurement) integral time t B1 (step 106) to determine the phase difference 2πf of the demodulated waveform of the reference panel 40A. m t B1 is obtained (step 107). Next, the phase difference 2πf m t B1 The wavelength of the demodulated wave is λ m Based on the distance difference ΔL B1(step 108). Also, t B1 In the case of >(T / 4), the integration time t B2 This corresponds to the case where the integral ratio S B2 / S0=(S all -S all ') / S0(S all ,S0 is known, S all ' is the actual measurement) integral time t B2 (step 106) to determine the phase difference 2πf m t B2 is obtained (step 107). Next, the phase difference 2πf m t B2 The wavelength of the demodulated wave is λ m Based on the distance difference ΔL B2 (step 108).

[0075] The time integration of the demodulated waveform of panel 40B2, which is a leading phase relative to the demodulated waveform of reference panel 40A, also starts when the reference time signal is received, and ends when the instantaneous value of the demodulated waveform becomes zero. B1 >(T / 4), and the integral time t B2 The phase difference between the demodulated waveform of the reference panel 40A and the demodulated waveform is 2πf m t B2 The wavelength of the demodulated wave is λ m Based on the distance difference ΔL B2 (step 108).

[0076] The second beam control device 80B then calculates the distance difference ΔL B1 , ΔL B2 is converted into a phase difference in the wavelength of the power transmitting microwave (step 109), and this value is used as a phase correction value for structural errors such as steps in the power transmitting antenna panel 40. Then, the phase correction value is instructed to the first phase shifter 72 (step 110). In other words, for the panel 40B1, the phase difference with respect to the microwaves radiated from the reference panel 40A is ΔL B1The first phase shifter 72 of the panel 40B1 is controlled so that the phase difference between the microwaves emitted from the panel 40B2 and the reference panel 40A is ΔL. B2 The first phase shifter 72 of the panel 40B2 is controlled so as to achieve a phase difference corresponding to: For the other panels 40B, the phase differences corresponding to the structural errors (step differences = distance differences) of the panel 40B are calculated in the same manner as described above, and the first phase shifters 72 of each panel 40B are controlled based on the calculated phase correction values.

[0077] In this manner, the structural error (step difference = distance difference) of the second power transmitting antenna panel 40B is electrically corrected using the position of the first power transmitting antenna panel 40A as a reference. Even if a step occurs between the position of the second power transmitting antenna panel 40B and the first power transmitting antenna panel 40A as a reference, the phase of the radiated microwave is corrected for each power transmitting antenna panel 40, so that the center of the microwave beam B radiated from the large-diameter power transmitting antenna (power transmitting antenna panel group) 12 can be directed toward the power receiving device 20 with high accuracy.

[0078] The series of microwave phase correction processes executed as described above are performed for each of the azimuth direction (which corresponds to the direction of travel in a power generating satellite orbiting the Earth; hereinafter referred to as the AZ direction) and the elevation direction (which corresponds to the direction perpendicular to the direction of travel in a power generating satellite orbiting the Earth; hereinafter referred to as the EL direction).

[0079] The phase correction in the AZ direction is performed when the arrival direction of the detected pilot signal P becomes an angle of zero in the AZ direction while the wireless power transmitting device 10 (power generating satellite) is moving (orbiting).

[0080] For phase correction in the EL direction, the arrival angle in the EL direction at the moment when the arrival direction of the pilot signal P becomes zero angle in the AZ direction is set to θ EL(EL arrival angle of the pilot signal from the third beam control device 80C), the distance between adjacent power transmitting antenna panels 40 (pilot signal receiving antenna 60C mounted in the center) is d, and the arrival angle of the pilot signal is dsinθ EL Note that there will be a distance difference of

[0081] As described above, according to this embodiment, based on the phase difference (obtained by using a reference time signal distributed by the first antenna panel 40A as a trigger) between the demodulated wave detected by the first antenna panel 40A and the demodulated wave detected by the second antenna panel 40B, phase correction control (phase command update) of the radiated microwave is performed simultaneously in parallel in all of the second antenna panels 40B, so that high-speed control is possible even if the power transmitting antenna panel group 12 is large-scale. Also, compared with phase control by the conventional REV method, phase correction of the microwave beam radiated from the large-diameter power transmitting antenna (power transmitting antenna panel group) 12 is possible in a much shorter time.

[0082] Furthermore, since the control regarding the phase correction of the transmission microwave uses a pilot signal wave superimposed with a modulated signal, phase correction is possible without stopping the operation of the effective microwave wireless power transmission (wireless power transmission). In addition, in cases where the relative positional relationship (direction) between the wireless power transmission device and the power receiving device does not change, such as when the wireless power transmission device (power generation satellite) is placed in geostationary orbit, it becomes possible to constantly monitor the structural error (step = distance difference) between each transmitting antenna panel 40, or to instantly detect the amount of displacement change, making it possible to perform phase correction in real time.

[0083] Although the embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned embodiment, and various modifications can be made, as a matter of course.

[0084] For example, in the above embodiments, amplitude modulation has been given as an example of a modulation method for the pilot signal P, but this is not limited to this, and any modulation method can be applied as long as the demodulated wave waveform in the power transmitting antenna panel 40 has a period and the phase of the demodulated wave in the first power transmitting antenna panel 40A and the demodulated wave in the second power transmitting antenna panel 40B can be obtained at the timing when the instantaneous value becomes zero.

[0085] In addition, in the above embodiment, an example of applying the present invention to a space solar power generation system that performs long-distance wireless power transmission has been described; however, the present invention is not limited to this, and can also be applied to, for example, a long-distance microwave wireless power transmission system between a large-diameter power transmission antenna installed on the ground or at sea and a flying object hovering above the antenna.

[0086] Furthermore, in the above embodiment, the reference time signal (trigger signal) generated in the reference panel (first power transmitting antenna panel) 40A serving as the reference for phase correction is wirelessly distributed simultaneously to each panel (second power transmitting antenna panel) 40B to be subjected to phase correction via the beam distribution control device 30, but this is not limited thereto, and the reference time signal may be relayed sequentially from the reference panel 40A to each adjacent panel 40B, and further from each panel 40B to other panels 40B adjacent thereto, without going through the beam distribution control device 30. In this case, for example, the reference time signal can be transmitted via a wireless communication module provided in each panel, or via an electrical contact such as a flexible wiring member provided between each panel.

[0087] Furthermore, the planar shape of the large-diameter power transmitting antenna (power transmitting antenna panel group) 12 is not limited to a rectangle, and may be other polygonal or circular. The planar shapes of the multiple power transmitting antenna panels (first power transmitting antenna panel 40A, second power transmitting antenna panel 40B) constituting the large-diameter power transmitting antenna (power transmitting antenna panel group) 12 may also be polygonal other than rectangular, and in this case, for example, a hexagon is preferable, which allows the intervals between the power transmitting antenna modules 53 to be constant. [Explanation of symbols]

[0088] 10...Wireless power transmission device (solar power satellite) 11…Power generation section 12...Large-diameter power transmission antenna (power transmission antenna panel group) 20...Power receiving device (power receiving equipment) 21...Receiving antenna (rectenna array) 30...Beam control device 40…Power transmission antenna panel 40A…First power transmission antenna panel 40B...Second power transmission antenna panel 51...Transmission antenna subarray 52…Transmitting / receiving antenna subarray 53...Power transmission antenna module 60, 60A, 60B, 60C...Pilot signal receiving antenna (receiving antenna element) 65…Pilot signal transmitting antenna 71...Microwave oscillator 72...First phase shifter 73...First amplifier 74...Second phase shifter 75…Second amplifier 80...Beam control device 80A...First beam control device (power transmission antenna panel 40A (inside the reference panel)) 80B...Second beam control device (inside the power transmission antenna panel 40B) 80C...Third beam control device (inside the power receiving device 20) 81A, 81B...Tracking receiver 82A, 82B...Demodulator (detection circuit) 83A, 83B...Radio transmission / reception unit 90A, 90B...Signal processing device 91...Reference signal generation section 92...Phase correction calculation section 93A, 93B... Phase control signal generating section 100...Microwave wireless power transmission system

Claims

1. the power transmitting antenna panel group includes a plurality of power transmitting antenna panels each having a pilot signal receiving antenna that receives a pilot signal transmitted as a modulated wave from a power receiving device, a plurality of power transmitting antenna modules that radiate microwaves, and a demodulator that detects the pilot signal received by the pilot signal receiving antenna, the plurality of power transmitting antenna panels being made up of a first power transmitting antenna panel having a first signal processing device and serving as a reference for panel position and phase correction, and a second power transmitting antenna panel having a second signal processing device and being a target for phase correction; The second signal processing device includes: a phase correction calculation unit that calculates a phase difference between a first demodulated wave that is a demodulated wave of the pilot signal detected by the first power transmitting antenna panel and a second demodulated wave that is a demodulated wave of the pilot signal detected by the second power transmitting antenna panel, and calculates a phase correction value of the power transmitting microwave based on the phase difference; a phase control signal generating unit that controls phases of microwaves radiated from the plurality of antenna modules in the second power transmitting antenna panel based on the phase correction value; Includes Wireless power transmission device.

2. The wireless power transmitting device according to claim 1 , the first signal processing device has a reference signal generating unit that generates a reference time signal indicating a timing at which an instantaneous value of the first demodulated wave waveform becomes zero; The phase correction calculation unit calculates an integral time of the second demodulated wave waveform from a ratio between a time integral value of a half cycle of the second demodulated wave and a time integral value of the second demodulated wave waveform from a timing at which the reference time signal is received to a time at which the instantaneous value of the second demodulated wave waveform becomes zero, and calculates a phase difference between the first demodulated wave and the second demodulated wave from the integral time. Wireless power transmission device.

3. The wireless power transmitting device according to claim 1 , The second signal processing device includes: a first phase shifter that collectively adjusts the phases of the microwaves radiated from the plurality of power transmitting antenna modules for each of the second power transmitting antenna panels; a second phase shifter that individually adjusts the phases of the microwaves radiated from the plurality of power transmitting antenna modules; The phase control signal generating unit controls the first phase shifter based on the phase correction value. Wireless power transmission device.

4. The wireless power transmitting device according to any one of claims 1 to 3, The second power transmitting antenna panel is a plurality of power transmitting antenna panels to be subjected to phase correction. Wireless power transmission device.

5. The wireless power transmitting device according to claim 4, The power transmitting apparatus further includes a beam control and management device that receives the reference time signal from the first power transmitting antenna panel and wirelessly distributes the reference time signal to the plurality of second power transmitting antenna panels simultaneously. Wireless power transmission device.

6. The wireless power transmitting device according to claim 4, The first power transmitting antenna panel is a power transmitting antenna panel located at the center of the power transmitting antenna panel group. Wireless power transmission device.

7. The wireless power transmitting device according to claim 1 , The power transmitting antenna panel group further includes a solar power generation module arranged on each of the plurality of power transmitting antenna panels. Wireless power transmission device.

8. a power receiving device having a rectenna array and a pilot signal transmitting antenna for transmitting a pilot signal transmitted as a modulated wave; a wireless power transmitting device having a planar power transmitting antenna panel group including a plurality of power transmitting antenna panels each having a pilot signal receiving antenna for receiving the pilot signal, a plurality of power transmitting antenna modules for radiating microwaves to the receiver array, and a demodulator for detecting the pilot signal received by the pilot signal receiving antenna, the plurality of power transmitting antenna panels being constituted by a first power transmitting antenna panel that is a reference for panel position and phase correction, and a second power transmitting antenna panel that is a target for phase correction; The second power transmitting antenna panel includes: a phase correction calculation unit that calculates a phase difference between a first demodulated wave that is a demodulated wave of the pilot signal detected by the first power transmitting antenna panel and a second demodulated wave that is a demodulated wave of the pilot signal detected by the second power transmitting antenna panel, and calculates a phase correction value of the power transmitting microwave based on the phase difference; a phase control signal generating unit that controls phases of microwaves radiated from the plurality of antenna modules in the second power transmitting antenna panel based on the phase correction value. Includes Wireless power transmission system.

9. 9. The wireless power transmission system according to claim 8, The power receiving device is installed on the ground, The wireless power transmission device is a solar power satellite in outer space equipped with a power generation unit. Wireless power transmission system.

10. 10. The wireless power transmission system according to claim 9, The power receiving device transmits the pilot signal at a timing when the wireless power transmitting device is in a positional relationship with the wireless power transmitting device such that the angle in the azimuth direction is zero. Wireless power transmission system.

11. A control device that performs phase correction of radiated microwaves for structural errors of a group of planar power transmitting antenna panels, the control device including a plurality of power transmitting antenna panels each having a pilot signal receiving antenna that receives a pilot signal transmitted as a modulated wave from a power receiving device, a plurality of power transmitting antenna modules that radiate microwaves, and a demodulator that detects the pilot signal received by the pilot signal receiving antenna, the plurality of power transmitting antenna panels being composed of a first power transmitting antenna panel that serves as a reference for panel position and phase correction, and a second power transmitting antenna panel that is a target for phase correction, a phase correction calculation unit that calculates a phase difference between a first demodulated wave that is a demodulated wave of the pilot signal detected by the first power transmitting antenna panel and a second demodulated wave that is a demodulated wave of the pilot signal detected by the second power transmitting antenna panel, and calculates a phase correction value of the power transmitting microwave based on the phase difference; a phase control signal generating unit that controls phases of microwaves radiated from the plurality of antenna modules in the second power transmitting antenna panel based on the phase correction value; A control device comprising:

12. A control method for performing phase correction of radiated microwaves for structural errors of a group of planar power transmitting antenna panels, the group including a pilot signal receiving antenna for receiving a pilot signal transmitted as a modulated wave from a power receiving device, a plurality of power transmitting antenna modules for radiating microwaves, and a demodulator for detecting the pilot signal received by the pilot signal receiving antenna, the plurality of power transmitting antenna panels being composed of a first power transmitting antenna panel that serves as a reference for panel position and phase correction, and a second power transmitting antenna panel that is a target for phase correction, the method comprising: calculating a phase difference between a first demodulated wave that is a demodulated wave of the pilot signal detected by the first power transmitting antenna panel and a second demodulated wave that is a demodulated wave of the pilot signal detected by the second power transmitting antenna panel; Calculating a phase correction value of the microwaves radiated from the plurality of antenna modules in the second power transmitting antenna panel based on the phase difference. Control methods.

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