JP4800337B2 - Array antenna, electromagnetic wave receiver, and electromagnetic wave arrival direction estimating device - Google Patents

Description

  The present invention relates to a technique for receiving an electromagnetic wave and estimating the arrival direction of the electromagnetic wave.

  An array antenna is formed by arranging a plurality of antenna elements at a predetermined interval, and its directivity pattern can be arbitrarily changed. By utilizing this characteristic, it is possible to realize a MIMO (Multiple Input Multiple Output) transmission system, which is a spatial diversity or wireless communication system, and contribute to the advancement of wireless technology. For example, space diversity is a technique for realizing high-quality data transmission by changing the directivity pattern of an antenna in a transmitter and a receiver and optimizing transmission characteristics. The MIMO transmission system is a technique for realizing wireless communication with higher frequency efficiency than the conventional wireless communication system, and is a transmission system expected as a solution to the problem of frequency tightness. Since the characteristics of these technologies are greatly influenced by the performance of the array antenna, it is required to produce a high-quality array antenna.

  A general array antenna includes a plurality of antennas and the same number of radio processing units as the plurality of antennas. Each antenna is connected to a wireless processing unit, and is arranged at an interval equal to or less than a half wavelength of the frequency to be used. When an array antenna is used as a transmitter, the main lobe is directed in any direction with respect to the array antenna by performing processing in the wireless processing unit so that the electric signals input to each antenna have a predetermined phase relationship. Can be controlled. On the other hand, when an array antenna is used as a receiver, the main lobe in any direction with respect to the array antenna is obtained by performing a predetermined weighting on the electrical signals received at the same time by each antenna and then adding them together. It is possible to control whether to receive the signal.

Of particular note among the array antenna characteristics is the main lobe characteristics that the array antenna can arbitrarily change. Ideally, it is desirable to have a main lobe that is sufficiently sharp in all directions. In particular, for an array antenna used for a receiver, a main lobe characteristic close to such ideal characteristics is desired. The reason is that, since the receiver needs to passively receive the transmitter that performs transmission spontaneously, the direction in which the electric signal arrives cannot be narrowed down in advance.
Tadao Nagatsuma and two others, "Electro-optic probe that enables more accurate electric field measurement", NTT Technical Journal, June 2006, p.21-24 Nobuyoshi Kikuma, "Adaptive signal processing by array antenna", Science and Technology Publishing Co., Ltd., November 25, 1998, p.173-268

  However, the characteristics of an actual array antenna are not ideal. For example, as shown in FIG. 7, in the case of an array antenna in which antennas are arranged linearly at half the wavelength interval with respect to the wavelength of the received signal, as shown in FIG. Can point a sufficiently sharp main lobe, but in principle the main lobe becomes thicker against electromagnetic waves coming from the direction B. That is, there is a problem that the change in the sharpness of the main lobe is worsened by a simple change from the azimuth A to the azimuth B. For convenience of explanation, it is assumed that the directivity pattern of each antenna is equal, and there is no coupling between antenna elements. An azimuth A indicates an azimuth perpendicular to the axis along which the antenna is aligned, and an azimuth B indicates an axial azimuth along which the antenna is aligned. The direction B with respect to the antennas arranged in this way is generally called an endfire.

  In addition, to realize an array antenna that can direct the main lobe of a certain characteristic regardless of the arrival direction of electromagnetic waves, in other words, in order to eliminate the endfire, each antenna is placed close to the same direction to place the antenna Need to be three-dimensional. However, the conventional array antenna disturbs electromagnetic waves because each antenna is made of metal. For this reason, even when array antennas are arranged three-dimensionally, antennas located inside the three-dimensional object or antennas located on the back side as viewed from the incoming electromagnetic waves receive only disturbed electromagnetic waves and serve as array antennas. There was a problem that the function did not work properly.

  The present invention has been made in view of the above, and an array antenna, an electromagnetic wave receiver, and an electromagnetic wave arrival direction estimation device for estimating the arrival direction of the electromagnetic wave with high accuracy without depending on the surrounding environment. It is an issue to provide.

The present invention according to claim 1, possess a plurality of electro-optic probe for insulation, and a support consisting of an insulating material supporting in an array in said plurality of electro-optic probe a predetermined distance An EO crystal having a first-order electro-optic effect whose refractive index changes linearly in proportion to an applied electric field, and an EO crystal that is incident on the electro-optic probe at the tip of the plurality of electro-optic probes. The dielectric reflecting film that reflects incident light that has passed through is formed, and the plurality of electro-optic probes are supported in a linear, planar, or three-dimensional state .

  In the present invention, since it has a plurality of insulating electro-optic probes and a support that supports the plurality of electro-optic probes in an array at a predetermined interval, an optical probe with a small electric field disturbance is used as an antenna element. By constructing an array antenna, an array antenna that does not depend on the surrounding conditions can be realized. That is, since the array antenna is formed by using an insulating electro-optic probe, the received signal is prevented from being electrically coupled with the surroundings and the electromagnetic wave is prevented from being disturbed. It is possible to provide an array antenna that does not depend on.

  In the present invention, since an insulating electro-optic probe is used, disturbance of electromagnetic waves can be prevented even when the electro-optic probe is arranged three-dimensionally. In other words, since the endfire can be eliminated by arranging in three dimensions, it is possible to realize an array antenna capable of orienting a main lobe having a constant characteristic regardless of the arrival direction of electromagnetic waves.

The present invention according to claim 2 is connected to each of the plurality of electro-optic probes via a probe array in which a plurality of insulating electro-optic probes are arranged at a predetermined interval and a fixed length optical path. A plurality of analyzers that convert a change in polarization state between incident light incident on the optical probe and reflected light output from each electro-optic probe into a light intensity change, and the plurality of analyzers via a fixed-length optical path. Are connected to each of the plurality of photoelectric conversion elements that convert the light intensity change output from each analyzer into an electrical signal, and are connected to each of the plurality of photoelectric conversion elements via a fixed-length electric path, And a plurality of samplers that digitize the magnitude of the electric signal output from the photoelectric conversion element.

  In the present invention, since the probe array is formed by using an insulating electro-optic probe, the received signal is prevented from being electrically coupled with the surroundings and the electromagnetic wave is prevented from being disturbed. In comparison, an electromagnetic wave receiver having an antenna that does not depend on the surrounding environment can be realized.

  Further, in the present invention, a probe array in which an electro-optic probe acting as a receiving element is arrayed, an analyzer connected to each of the plurality of electro-optic probes via a fixed-length optical path, and a fixed-length A photoelectric conversion element connected to each of the plurality of analyzers via a plurality of optical paths, and a sampler connected to each of the plurality of photoelectric conversion elements via a fixed-length electric path for each electro-optic probe. Therefore, the received electromagnetic wave signals can be obtained in the same manner as the conventional array antenna.

The gist of the present invention described in claim 3 is that the plurality of electro-optic probes are arranged in any one of a linear shape, a planar shape, and a three-dimensional shape.

  In the present invention, since an insulating electro-optic probe is used, disturbance of electromagnetic waves can be prevented even when the electro-optic probe is arranged three-dimensionally. In other words, since it is possible to eliminate the endfire by arranging three-dimensionally, it is possible to realize an electromagnetic wave receiver having an antenna capable of orienting a main lobe having a certain characteristic regardless of the arrival direction of the electromagnetic wave. .

According to a fourth aspect of the present invention, there is provided a probe array in which a plurality of insulating electro-optic probes are arranged at predetermined intervals, and each of the plurality of electro-optic probes connected via a fixed length optical path. A plurality of analyzers that convert a change in polarization state between incident light incident on the optical probe and reflected light output from each electro-optic probe into a light intensity change, and the plurality of analyzers via a fixed-length optical path. Are connected to each of the plurality of photoelectric conversion elements that convert the light intensity change output from each analyzer into an electrical signal, and are connected to each of the plurality of photoelectric conversion elements via a fixed-length electric path, A plurality of samplers that digitize the magnitude of the electrical signal output from the photoelectric conversion element, and a plurality of the electrical samples that are connected to the plurality of samplers via a fixed-length electric circuit and digitized by the plurality of samplers. Signal The correction is performed using correction values for correcting errors caused by the composition of each electro-optic probe, each analyzer, each photoelectric conversion element, and each sampler. And an estimation means for estimating the arrival direction of the electromagnetic wave by applying the arrangement interval information on which the electro-optic probe is arranged to a predetermined measurement method.

  In the present invention, since the probe array is formed by using an insulating electro-optic probe, the received signal is prevented from being electrically coupled with the surroundings and the electromagnetic wave is prevented from being disturbed. In comparison, it is possible to realize an electromagnetic wave arrival direction estimation apparatus having an antenna that does not depend on the surrounding environment.

  In the present invention, since an insulating electro-optic probe is used, disturbance of electromagnetic waves can be prevented even when the electro-optic probe is three-dimensionally arranged. In other words, since it is possible to eliminate the endfire by arranging in three dimensions, an electromagnetic wave arrival direction estimation device having an antenna capable of orienting a main lobe with a certain characteristic regardless of the arrival direction of the electromagnetic wave is realized. Can do.

  Furthermore, in the present invention, a probe array in which electro-optic probes acting as receiving elements are arrayed, an analyzer connected to each of the plurality of electro-optic probes via a fixed-length optical path, and a fixed-length A photoelectric conversion element connected to each of the plurality of analyzers via a plurality of optical paths, and a sampler connected to each of the plurality of photoelectric conversion elements via a fixed-length electric path for each electro-optic probe. Therefore, the received electromagnetic wave signals can be obtained in the same manner as the conventional array antenna.

  In the present invention, the magnitude of a plurality of electrical signals digitized by a plurality of samplers is corrected for errors caused by the composition of each electro-optic probe, each analyzer, each photoelectric conversion element, and each sampler. In order to estimate the arrival direction of the electromagnetic wave by applying a predetermined measurement method to each of the corrected electric signal magnitudes and the arrangement interval information on the arrangement of the plural electro-optic probes. The direction of arrival of electromagnetic waves can be estimated with higher accuracy.

The gist of the present invention described in claim 5 is that the plurality of electro-optic probes are arranged in any one of a linear shape, a planar shape, and a three-dimensional shape.

  According to the present invention, it is possible to provide an array antenna, an electromagnetic wave receiver, and an electromagnetic wave arrival direction estimation device that estimates the arrival direction of an electromagnetic wave with high accuracy without depending on the surrounding environment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a configuration diagram showing a system configuration of an electromagnetic wave receiver according to the present embodiment. The electromagnetic wave receiver α is connected to a probe array 10 in which a plurality of electro-optic probes 5 are arranged, a plurality of analyzers 30 connected to each of the plurality of electro-optic probes 5, and a plurality of analyzers 30. The plurality of photoelectric conversion elements 50 and the plurality of samplers 70 connected to each of the plurality of photoelectric conversion elements.

  The probe array 10 (array antenna) is composed of a plurality of electro-optic probes 5 (first electro-optic probe 5a to n-th electro-optic probes 5n: n) made of a material having no conductivity. It has the structure arrange | positioned at the predetermined | prescribed space | interval using the support tool 6 produced with the material without this. For example, as shown in FIG. 2, the plurality of electro-optic probes 5 can be arranged linearly (one-dimensionally) with a half wavelength of the frequency to be received as an interval. Further, as shown in FIG. 3 and FIG. 4, it is also possible to arrange in a planar shape (two-dimensional) or a three-dimensional shape (three-dimensional) with the half wavelength of the received frequency as an interval. 2 to 4 show only the electric field measurement points (dots) in the electro-optic probe. The material for producing the electro-optic probe 5 and the support 6 is desirably a material having no conductivity and a low dielectric constant, that is, a material having an insulating property.

  Here, the principle of electric field measurement of the electro-optic probe 5 will be described. As shown in FIG. 5A, an EO (Electro Optic) having a primary electro-optic effect (Pockels effect) whose refractive index changes linearly in proportion to an applied electric field is provided at the tip of the electro-optic probe 5. ) A crystal 100 and a dielectric reflection film 110 are formed. Since the refractive index of the EO crystal 100 changes according to an electric field applied from the outside, it is possible to obtain an effect of changing the polarization state of light passing through the crystal. Specifically, when no electric field is applied, incident light that has entered the EO crystal 100 is reflected by the dielectric reflecting film 110 while returning its polarization state and returns. On the other hand, when an electric field is applied, the refractive index of the EO crystal 100 changes depending on the crystal plane on which light is incident and the polarization state, and reflected light whose polarization state has changed returns (see Non-Patent Document 1). . Therefore, by observing the change in the polarization state between the incident light and the reflected light, it is possible to measure in which electric field the EO crystal 100 exists. FIG. 5B shows a general configuration of the electro-optic probe 5. The distal end portion of the electro-optic probe 5 includes an EO crystal 100, a dielectric reflection film 110, a collimator lens 120, and a ferrule 130. The electro-optic probe 5 has a configuration in which the tip portion is fixed to one end of the glass tube 140 and the optical fiber connector 150 passing through the glass tube is fixed to the other end.

  The analyzer 30 is connected to the electro-optic probe 5 through the optical fiber 20. More precisely, each of the first analyzer 30a to the n-th analyzer 30n passes through the first optical fiber 20a to the n-th optical fiber 20n, and the first electro-optic probe 5a to the n-th optical fiber 20n. Each of the n electro-optic probes 5n is connected. Note that the first optical fiber 20a to the nth optical fiber 20n all have the same length. The analyzer 30 has a function of converting a change in polarization state between incident light incident on the electro-optic probe 5 and reflected light output from the electro-optic probe 5 into a change in light intensity. The analyzer 30 can be realized by using, for example, a polarizing plate.

  The photoelectric conversion element 50 is connected to the analyzer 30 through the optical fiber 40. More precisely, the first photoelectric conversion element 50a to the nth photoelectric conversion element 50n are respectively connected to the first analyzer 30a to the first analyzer 30a to the nth optical fiber 40n. Each of the nth analyzers 30 is connected. Note that the first optical fiber 40a to the nth optical fiber 40n all have the same length. The photoelectric conversion element 50 has a function of converting a change in light intensity output from the analyzer 30 into an electric signal. The analyzer can be realized by a photodiode, for example.

  The sampler 70 is connected to the photoelectric conversion element 50 via the transmission line 60. More precisely, the first sampler 70a to the nth sampler 70n are connected to the first photoelectric conversion element 50a to the nth sample through the first transmission line 60a to the nth transmission line 60n, respectively. Each of the photoelectric conversion elements 50 is connected. Note that the first transmission line 60a to the nth transmission line 60n all have the same length. The photoelectric conversion element 50 has a function of quantifying the instantaneous magnitude of an electric signal output from the photoelectric conversion element 50. Such a sampler only needs to be sampled at a sufficient speed for observing the waveform of the electric signal, and can be realized by an A / D converter, for example.

  Next, the operation of the electromagnetic wave receiver α according to the present embodiment will be described. First, the electromagnetic wave receiver α is installed in an electric field to be measured. The plurality of electro-optic probes 5 converts electric field information applied from the outside into polarization information of light. Then, the analyzer 30 receives the polarization information of the light output from the electro-optic probe via the optical fiber 20 and converts it into the amplitude information of the light. Thereafter, the photoelectric conversion element 50 receives light amplitude information via the optical fiber 40 and converts it into an electrical signal. Finally, the sampler 70 receives an electric signal via the transmission line 60 and digitizes the electric field information. Through the series of operations, the electromagnetic wave receiver α can output n pieces of digitized electric field information. Since the lengths of the optical fibers 20 are the same, the lengths of the optical fibers 40 are the same, and the lengths of the transmission lines are the same, the electric field is measured by the electro-optic probe 5 and then digitized by the sampler. The time until the time is the same for all the electro-optic probes 5.

  According to the present embodiment, since the plurality of insulative electro-optic probes 5 and the support 6 that supports the plurality of electro-optic probes 5 in an array at predetermined intervals are provided, the optical probe having a small electric field disturbance. By constructing an array antenna using antenna elements as antenna elements, it is possible to realize an array antenna and an electromagnetic wave receiver α that do not depend on surrounding conditions. In other words, since the array antenna is formed using an insulating electro-optic probe, the received signal is prevented from being electrically coupled with the surroundings, and the electromagnetic wave is prevented from being disturbed. It is possible to provide an array antenna and an electromagnetic wave receiver α that do not depend on.

  According to the present embodiment, since the insulating electro-optic probe 5 is used, even when the electromagnetic wave receiver α is installed in the vicinity of the measurement target that emits electromagnetic waves, the electrical coupling with the measurement target is performed. In addition, the effects of preventing the disturbance of electromagnetic waves can be obtained. Therefore, it is possible to realize an array antenna that does not depend on the surrounding environment as compared with a conventional array antenna and an electromagnetic wave receiver α having the array antenna.

  According to the present embodiment, since the insulating electro-optic probe 5 is used, disturbance of electromagnetic waves can be prevented even when the electro-optic probe is three-dimensionally arranged. In other words, since it is possible to eliminate the endfire by arranging in three dimensions, an array antenna and an electromagnetic wave receiver α having an antenna capable of orienting a main lobe with a fixed characteristic regardless of the arrival direction of the electromagnetic wave are realized. can do.

  According to the present embodiment, the probe array 10 in which the electro-optic probes 5 acting as receiving elements are arrayed, the optical fiber 20, the analyzer 30, the optical fiber 40, the photoelectric conversion element 50, and the transmission line 60. Since the sampler 70 and the electro-optic probes 5 have the same positional relationship, electromagnetic wave reception signals can be obtained in the same manner as conventional linear array antennas, planar array antennas, and three-dimensional array antennas.

  In the present embodiment, the configuration in which the plurality of electro-optic probes 5 are arranged using the support 6 (arraying) has been described. However, the plurality of electro-optic probes 5 are arranged using only a material having no conductivity. Any specific type of support 6 may be used.

  Moreover, in order to make the analyzer 30, the photoelectric conversion element 50, and the sampler 70 function sufficiently, for example, an optical amplifier is inserted between the analyzer 30 and the photoelectric conversion element 50, or the photoelectric conversion element 50 and the sampler 70 are included. It is easily imagined that an amplifier or a filter is preferably inserted between the two. Further, a method using a variable delay line or the like can be easily imagined in order to equalize the optical path length of each optical fiber 20 and each optical fiber 40 and the electrical length of each transmission line 60. Needless to say, even if these are added, the same effect can be obtained if the optical path length and the electrical length are the same for each electro-optic probe 5.

[Second Embodiment]
Next, an electromagnetic wave arrival direction device using the above-described electromagnetic wave receiver α will be described. FIG. 6 is a configuration diagram illustrating a system configuration of the electromagnetic wave arrival direction estimation apparatus. This electromagnetic wave arrival direction estimation device β is configured to include an electromagnetic wave receiver α and an estimation unit 90 connected to a plurality of samplers 70 in the electromagnetic wave receiver α.

  The estimation unit 90 is connected to each of the first sampler 70a to the nth sampler 70 via each of the first transmission line 80a to the nth transmission line 80n. The first transmission line 80a to the n-th transmission line 80n all have the same length.

  First, the estimation unit 90 receives the magnitudes of a plurality of electrical signals quantified by the plurality of samplers 70 via the transmission line 80 and stores them in correspondence with the electro-optic probes 5. For example, when n electrical signals are received, a 1 × n data matrix is set.

  Next, the estimation unit 90 corrects an error caused by the composition of each electro-optic probe 5, each analyzer 30, each photoelectric conversion element 50, and each sampler 70, and is stored in advance in a storage unit. The values (correction matrix) are used to correct the magnitudes of the received plurality of electrical signals. That is, the correction matrix is used to correct the magnitude of the electric signal in each column in the 1-row, n-column data matrix to obtain a corrected data matrix. The correction value (correction matrix) will be described later.

  Finally, the estimation unit 90 estimates the arrival direction of the electromagnetic wave using the arrival direction estimation method as described below. Examples of methods for estimating the direction of arrival of electromagnetic waves include the beam former method, the Capon method, the linear prediction method, the MUSIC method, and the ESPRIT method. In addition, as represented by the spatial averaging method, there are means for improving the arrival direction estimation method of these electromagnetic waves (see Non-Patent Document 2). In other words, the intensity of the electromagnetic wave is calculated by applying the corrected magnitudes of the plurality of electric signals and the arrangement interval information on the arrangement of the plurality of electro-optic probes 5 to any of the above arrival estimation measurement methods. And the arrival direction with reference to the probe array 10 can be estimated.

  The correction value (correction matrix) is used to correct an error in data caused by the hardware configuration and its characteristics. In estimating the direction of arrival, the characteristics of the elements such as the electro-optic probes 5, the analyzers 30, and the photoelectric conversion elements 50 that are arranged, the optical path length from each element to each sampler 70, the electrical length, and the transmission path Are all required to be equal in frequency characteristics. If these characteristics are not equal for each element, the direction of arrival cannot be estimated accurately. However, in reality, since it is impossible to make all the characteristics of each element exactly equal, the correction matrix is prepared in advance to solve this problem.

  Hereinafter, an example of a correction matrix creation method will be described. An electromagnetic wave arrival direction estimation device (hereinafter also simply referred to as “device”) according to the present embodiment is constructed and installed in an environment free from external electromagnetic waves such as an anechoic chamber. Next, an electromagnetic wave source is installed in a known direction with respect to the apparatus, for example, in front of the apparatus, and the data matrix A is acquired. In addition, a data matrix B obtained when a wave source is installed in front of a device in which the characteristics of each element are ideally equal in the absence of external electromagnetic waves is calculated. Then, by comparing the data matrix A and the data matrix B, a correction matrix to be added to or multiplied by the data matrix A can be obtained.

  According to the present embodiment, the magnitudes of the plurality of electrical signals quantified by the plurality of samplers 70a to 70n are changed to the electro-optic probes 5a to 5n, the analyzers 30a to 30n, and the photoelectric conversion elements 50a to 50n. , Correction is performed using correction values for correcting errors caused by the compositions of the samplers 70a to 70n, and the corrected magnitudes of the plurality of electric signals and the arrangement interval information on which the plurality of electro-optic probes 5a to 5n are arranged Is applied to any of the above arrival estimation measurement methods to estimate the arrival direction of the electromagnetic wave, so that the arrival direction of the electromagnetic wave can be estimated with higher accuracy.

It is a block diagram which shows the system configuration | structure of an electromagnetic wave receiver. It is a figure which shows the electric field measurement point of the electro-optic probe arrange | positioned linearly. It is a figure which shows the electric field measurement point of the electro-optic probe arrange | positioned planarly. It is a figure which shows the electric field measurement point of the electro-optic probe arrange | positioned in three-dimensional form. It is a figure which shows the principle and structure of an electro-optic probe. It is a block diagram which shows the system configuration | structure of an electromagnetic wave arrival direction estimation apparatus. It is explanatory drawing explaining the mode of the main lobe characteristic of the conventional one-dimensional array antenna.

Explanation of symbols

DESCRIPTION OF SYMBOLS 5 ... Electro-optic probe 10 ... Probe array 20, 40 ... Optical fiber 30 ... Analyzer 50 ... Photoelectric conversion element 60, 80 ... Transmission line 70 ... Sampler 90 ... Estimation part alpha ... Electromagnetic wave receiver beta ... Electromagnetic wave arrival direction estimation apparatus

Claims (5)

A plurality of insulating electro-optic probes;
Have a, a support made of an insulating material supporting in an array in said plurality of electro-optic probe a predetermined distance,
At the tip of the plurality of electro-optic probes, an EO crystal having a first-order electro-optic effect whose refractive index changes linearly in proportion to an applied electric field, and the EO crystal incident on the electro-optic probe are A dielectric reflection film that reflects the incident light that has passed through is formed,
The array antenna is characterized in that the plurality of electro-optic probes are supported in a linear, planar, or three-dimensional state . A probe array in which a plurality of insulating electro-optic probes are arranged at predetermined intervals;
Connected to each of the plurality of electro-optic probes via a fixed-length optical path, the change in the light intensity changes the polarization state of the incident light incident on each electro-optic probe and the reflected light output from each electro-optic probe. With multiple analyzers to convert to
A plurality of photoelectric conversion elements that are connected to each of the plurality of analyzers via a fixed-length optical path, and convert the light intensity change output from each analyzer into an electrical signal;
A plurality of samplers connected to each of the plurality of photoelectric conversion elements via a fixed-length electric circuit, and quantifying the magnitude of the electric signal output from each photoelectric conversion element;
An electromagnetic wave receiver comprising: The electromagnetic wave receiver according to claim 2 , wherein the plurality of electro-optic probes are arranged in any one of a linear shape, a planar shape, and a three-dimensional shape. A probe array in which a plurality of insulating electro-optic probes are arranged at predetermined intervals;
Connected to each of the plurality of electro-optic probes via a fixed-length optical path, the change in the light intensity changes the polarization state of the incident light incident on each electro-optic probe and the reflected light output from each electro-optic probe. With multiple analyzers to convert to
A plurality of photoelectric conversion elements that are connected to each of the plurality of analyzers via a fixed-length optical path, and convert the light intensity change output from each analyzer into an electrical signal;
A plurality of samplers connected to each of the plurality of photoelectric conversion elements via a fixed-length electric circuit, and quantifying the magnitude of the electric signal output from each photoelectric conversion element;
The magnitudes of the plurality of electrical signals connected to the plurality of samplers through a predetermined length of the electric circuit and quantified by the plurality of samplers are determined as the respective electro-optic probes, the respective analyzers, the respective photoelectric conversion elements, and the respective samplers. Correction is performed using correction values for correcting errors caused by the composition of the plurality of signals, and the corrected plurality of electric signal magnitudes and arrangement interval information on the arrangement of the plurality of electro-optic probes are applied to a predetermined measurement method. Estimating means for estimating the direction of arrival of electromagnetic waves,
An electromagnetic wave arrival direction estimation device characterized by comprising: The electromagnetic wave arrival direction estimation apparatus according to claim 4 , wherein the plurality of electro-optic probes are arranged in a linear, planar, or three-dimensional state.

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