JP2019057850A - Phased array antenna, digital radio repeater, and method for measuring inter-element deviation of phased array antenna - Google Patents

Abstract

To provide a phased array antenna which enables the measurement of an inter-element deviation of a plurality of transmit antennas with a simple structure.SOLUTION: A phased array antenna comprises: a distribution circuit for distributing a reference orthogonal signal; digital beam forming (DBF) circuits which control the amplitude and phase of an output of the distribution circuit; quadrature modulators which perform quadrature modulation of outputs of the DBF circuits; transmission means for transmitting outputs subjected to DA conversion of the quadrature modulators; transmit antenna elements connected to the transmission means; a receive antenna element; receiving means; a quadrature demodulator which performs quadrature demodulation of an AD-converted output of the receiving means; and a control part which causes the DBF circuits to output signals sequentially, and which determines correction coefficients of the amplitude and phase between antenna elements based on the difference between the reference orthogonal signal and an output signal of the quadrature demodulator of each of the antenna elements received concurrently with the reference orthogonal signal.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a phased array antenna, a digital radio repeater, and a method for measuring a deviation between elements of a phased array antenna.

  In order to form a highly accurate antenna radiation pattern with a phased array antenna, it is necessary to correct the amplitude and phase between antenna elements.

  Patent Document 1 discloses a method for measuring and correcting the amplitude and phase between elements of a transmission array antenna. That is, signals orthogonally modulated from the transmission system are simultaneously output to a plurality of transmission antenna elements in a distinguishable manner. In the receiving system, the signals received by one receiving antenna are orthogonally demodulated by the receivers prepared for the number of transmitting antennas to obtain the amplitude and phase deviation for each transmitting antenna. Based on the deviation thus obtained, the amplitude and phase of each transmission antenna are corrected.

JP 2012-112812 A

  However, in the method according to Patent Document 1, the number of internal circuits of the digital signal processor in the reception system is required as many as the number of transmission antennas, and the circuit scale of the reception system becomes a problem particularly when there are many elements.

  An object of the present invention is to provide a phased array antenna, a digital wireless repeater, and a method for measuring an inter-element deviation of a phased array antenna capable of measuring an inter-element deviation of a plurality of transmission antennas with a simple configuration in view of the above-described problems. There is to do.

  In order to achieve the above object, a phased array antenna of the present invention includes a distribution circuit that distributes a reference orthogonal signal, and digital beam forming (Digital Beam Forming) that controls and outputs the output amplitude and phase of the distribution circuit. DBF) circuit, a quadrature modulator that quadrature modulates the output of each DBF circuit, a DA converter that DA converts the output of the quadrature modulator, a transmission means that transmits the output of the DA converter, and the transmission Transmitting antenna element connected to the receiving means, one receiving antenna element, receiving means for receiving a signal received by the receiving antenna element, AD converter for AD converting the output of the receiving means, and the AD converter The quadrature demodulator for quadrature demodulating the output of the signal, storage means for storing the reference quadrature signal and the output of the quadrature demodulator at the same time, and sequentially for each DBF circuit The difference between the amplitude and phase of different antenna elements and the correction coefficient are obtained based on the difference between the reference quadrature signal stored in the storage means and the output signal of the quadrature demodulator at the same time. The DBF circuit includes a control unit that performs correction based on the correction coefficient.

  In order to achieve the above object, a digital radio repeater according to the present invention includes one feeder link receiving antenna, first receiving means for receiving a signal received by the feeder link receiving antenna, and the first receiving. A synthesizer for synthesizing the intermediate frequency output of the means and the intermediate frequency output of the second receiving means; an AD converter for AD converting the output of the synthesizer; and an orthogonal demodulator for orthogonally demodulating the output of the AD converter; , Signal processing means for generating a reference orthogonal signal based on the output of the first receiving means from the output of the orthogonal demodulator, a distribution circuit for distributing the reference orthogonal signal, and the amplitude and phase of the output of the distribution circuit. Digital beam forming (DBF) circuit for controlling and outputting, quadrature modulator for quadrature modulating the output of each DBF circuit, and DA converter for DA converting the output of the quadrature modulator Transmitting means for transmitting the output of the DA converter; transmitting antenna element connected to the transmitting means; one receiving antenna element; and second receiving means for receiving a signal received by the receiving antenna element; A storage means for storing the reference quadrature signal and a measurement quadrature signal generated from the output of the quadrature demodulator based on the output of the second receiving means at the same time, and sequentially for each of the DBF circuits. Based on the difference between the reference quadrature signal stored in the storage means and the output signal of the quadrature demodulator at the same time, the difference between the amplitude and phase of different antenna elements and the correction coefficient are obtained. The DBF circuit includes a control unit that performs correction based on the correction coefficient.

  In order to achieve the above object, the inter-element deviation measuring method of the phased array antenna according to the present invention distributes a reference quadrature signal, performs quadrature modulation, and DA-converts a signal for each of a plurality of transmitting antenna elements. Transmitting sequentially, receiving a signal transmitted from the transmitting antenna element by one receiving antenna element, AD-converting the received signal and then orthogonally demodulating the orthogonal signal based on the reference orthogonal signal at the same time The difference between the amplitude and phase between the transmitting antenna elements and the correction coefficient are obtained.

  According to the present invention, the inter-element deviation measuring method of the phased array antenna, the digital radio repeater, and the phased array antenna can measure the inter-element deviations of a plurality of transmission antennas with a simple configuration.

It is a figure which shows the structural example of 1st Embodiment. It is a figure which shows the structural example of 2nd Embodiment. It is a figure which shows the structural example of 2nd Embodiment. It is a figure which shows the structural example of 2nd Embodiment. It is a figure which shows the structural example of 2nd Embodiment. It is a figure which shows operation | movement of 2nd Embodiment. It is a figure which shows the structural example of 3rd Embodiment. It is a figure which shows the structural example of 3rd Embodiment. It is a figure which shows the structural example of 3rd Embodiment.

[First Embodiment]
The phased array antenna 10 of the present embodiment includes a distribution circuit 11 that distributes a reference orthogonal signal, and a digital beam forming (DBF) circuit 12 that controls and outputs the output amplitude and phase of the distribution circuit 11. Further, the phased array antenna 10 includes an orthogonal modulator (IQ MOD) 13 that orthogonally modulates the output of each of the DBF circuits 12, and a DA converter (D / A) 14 that DA converts the output of the orthogonal modulator 13. Is provided. The phased array antenna 10 includes transmission means (TX) 15 for transmitting the output of the DA converter 14 and transmission antenna elements 21 to 2n connected to the transmission means 15. The phased array antenna 10 includes one receiving antenna element 31, receiving means (RX) 16 that receives a signal received by the receiving antenna element 31, and an AD converter that AD converts the output of the receiving means 16 ( A / D) 17. Further, the phased array antenna 10 includes an orthogonal demodulator (IQ DEM) 18 that orthogonally demodulates the output of the AD converter 17, and a storage unit 19 that stores the reference orthogonal signal and the output of the orthogonal demodulator 18 at the same time. With. Further, the phased array antenna 10 includes a control unit 20. The control means 20 sequentially outputs a signal for each of the DBF circuits 12. And the control means 20 is based on the difference between the reference orthogonal signal stored in the storage means 19 and the output signal of the orthogonal demodulator at the same time, and the difference in amplitude and phase between the different transmission antenna elements 21 to 2n. And find the correction factor. Further, the control means 20 performs correction based on the correction coefficient for the DBF circuit 12.

By doing in this way, the phased array antenna 10 of this embodiment makes it possible to measure the inter-element deviations of the plurality of transmission antennas of the plurality of transmission antennas with a single reception system.
[Second Embodiment]
Next, a second embodiment will be described with reference to FIGS.
[Description of configuration]
2 to 5 show a configuration example of the second embodiment.

  Referring to FIG. 2, the digital radio repeater 50 according to the present embodiment includes a user link processing device 100, a control unit 200, a user link transmission unit 300, a user link transmission antenna 350, a measurement reception unit 400, and a measurement reception antenna 450. Is provided. The digital wireless repeater 50 further includes a feeder link receiving unit 500 and a feeder link receiving antenna 550.

  Details of the user link processing device 100 and the control unit 200 are shown in FIG. Details of the feeder link receiving unit 500 and the feeder link receiving antenna 550 are shown in FIG. Details of the user link transmission unit 300, the user link transmission antenna 350, the measurement reception unit 400, and the measurement reception antenna 450 are shown in FIG.

  Feeder link reception antenna 550 is an antenna for receiving a feeder link reception signal from a satellite.

  Next, the configuration of the feeder link receiver 500 will be described with reference to FIG.

  The amplifier 501 is a high-frequency signal amplifier. The frequency converter 502 is a frequency converter that converts a high-frequency signal into an intermediate frequency (IF) signal. A bandpass filter (BPF) 503 is a bandpass filter that removes unnecessary frequency components.

  Next, the configuration of the user link processing apparatus 100 will be described with reference to FIG.

  The user link processing apparatus 100 performs processing for arranging each channel received from the feeder link in a desired frequency band with a desired beam.

  The AD converter 101 is an AD converter that converts an IF band analog signal into a digital signal. An orthogonal demodulator (IQ Demodulator; IQ DEM) 102 is a circuit that performs orthogonal demodulation. A low pass filter (LPF) 103 is a circuit that removes excess high frequency components. The demultiplexing processing unit 104 is a circuit that performs frequency demultiplexing on the digital signal. The exchange processing unit 105 performs routing setting for arranging each channel after demultiplexing processing in a desired frequency band of a desired beam.

  The digital beam forming (DBF) processing units 121, 122 to 12n multiply the demultiplexed signal by a weighting factor for each element to generate a digital signal that realizes a maximum of n transmission beams. Generate. The multiplexing processing units 131, 132 to 13n perform frequency multiplexing for each element. The amplitude / phase adjusting units 141, 142 to 14n are based on the information on the amplitude / phase inter-element deviation measured by the digital wireless repeater 50, according to the correction coefficient for each element set by the setting unit 201 of the control unit 200. Correct the phase.

  Quadrature modulators (IQ Modulator; IQ MOD) 151, 152 to 15n perform quadrature modulation based on the real part (I) and the imaginary part (Q) of the quadrature signal, respectively. The DA converters 161 and 162 to 16n are DA converters that convert a digital signal into an analog signal. The outputs of the DA converters 161 and 162 to 16n are connected to the user link transmission unit 300.

  The AD converter 111 is an AD converter that receives an analog signal output from the measurement receiving unit 400 and converts the analog signal into a digital signal. The quadrature demodulator (IQ DEM) 112 is a circuit that performs quadrature demodulation. A low-pass filter (LPF) 113 is a circuit that removes excess high-frequency components. The extraction processing unit 114 performs a process of performing frequency demultiplexing to extract a CW channel received for measurement.

  The data acquisition unit 107 acquires the amplitude and phase of the reference signal among the signals demultiplexed by the exchange processing unit 105 in accordance with instructions from the control unit 200. Further, the data acquisition unit 115 acquires the amplitude and phase of the signal extracted by the extraction processing unit 114 in accordance with an instruction from the control unit 200.

  The CW generator 106 is a reference signal transmitter described later. The CW generation unit 106 is a configuration necessary when a signal received via a feeder link is not used as a reference signal, and may be deleted when a signal received via a feeder link is used as a reference signal.

  Next, the configuration of the user link transmission unit 300 will be described with reference to FIG.

  The frequency conversion units 311, 312 to 31 n are frequency converters that convert the intermediate frequency signal (IF) output from the user link processing apparatus 100 into a high frequency signal (RF). The transmission systems 321 and 322 to 32n are transmission system circuits including amplifiers, exciters, and the like.

  Next, the configuration of the user link transmission antenna 350 will be described with reference to FIG.

  The transmission antenna elements 351, 352 to 35n are n antenna elements for transmitting user link transmission signals, and the transmission antenna elements 351, 352 to 35n constitute a user link transmission antenna 350 as an array antenna.

  Next, the configuration of the measurement receiver 400 will be described with reference to FIG.

  The amplifier 401 is an amplifier that amplifies the radio wave received by the measurement receiving antenna 450 with a high frequency. The frequency converter 402 is a frequency converter that converts a high frequency signal into an intermediate frequency signal. The band pass filter 403 is a band pass filter.

  Next, the configuration of the control unit 200 will be described with reference to FIG.

  The control unit 200 controls the hardware of the digital radio repeater 50. The control unit 200 may include a CPU (Central Processing Unit) and a memory, and may perform software processing.

  The control unit 200 has the following functions.

The setting unit 201 sets parameters for the components of the digital wireless repeater 50. The instruction unit 202 instructs the components of the digital wireless repeater 50 to operate. The reference value storage unit 203 stores data of the data acquisition unit 107. The measured value storage unit 204 stores data of the data acquisition unit 115.
[Description of operation]
Next, the operation of the present embodiment will be described with reference to FIG.

  First, the setting unit 201 of the control unit 200 sets a variable k to 1 (S101).

  The setting unit 201 sets the digital beam forming processing units 121 to 12n to transmit from only the k-th antenna among the transmission antenna elements 351 to 35n (S102).

  The radio wave transmitted from the k-th antenna is received by the measurement receiving antenna 450, and then reaches the data acquisition unit 115 of the user link processing apparatus 100 via the measurement receiving unit 400.

  The instruction unit 202 of the control unit 200 instructs the data acquisition unit 107 and the data acquisition unit 115 to acquire amplitude and phase data at the same time.

  The data acquired by the data acquisition unit 107 is stored in the reference value storage unit 203, and the data acquired by the data acquisition unit 115 is stored in the measurement value storage unit 204 (S103).

  The relative value calculation unit 205 calculates a relative value based on the data stored in the reference value storage unit 203 and the measurement value storage unit 204 (S104).

  An example of how to obtain the relative value is shown.

  Relative values are obtained separately for amplitude and phase, but the following description is common to both values.

  For example, the transmission antenna element 35n is defined as a reference antenna, and the measured value of the transmission antenna element 35n is defined as zero with respect to the relative value.

  The measurement value of the reference antenna, that is, the transmission antenna element 35n is a measurement value 35n, and the reference value when the transmission antenna element 35n is measured is a reference value 35n.

  Next, a measurement value of the transmission antenna element 351 is set as a measurement value 351, and a reference value when the transmission antenna element 351 is measured is set as a reference value 351.

The relative value of the transmission antenna element 351 with respect to the reference antenna (transmission antenna element 35n) can be obtained by the following equation.

Relative value of transmitting antenna element 351 with respect to transmitting antenna element 35n = (Measured value 351−Measured value 35n) − (Reference value 351−Reference value 35n)

Subsequent to step S104, the control unit 200 associates the relative values of the amplitude and phase calculated by the relative value calculation unit 205 in step S104 with the measured transmission antenna number k and stores them in the relative value storage unit 206 ( S105).

  The setting unit 201 adds 1 to the variable k (S106).

  The setting unit 201 determines whether k is n. n is the number of transmitting antenna elements 351 to 35n (S107).

  If it is determined in step S107 that k is n (Y in S107), the process proceeds to step S108.

  If it is determined in step S107 that k is not n (N in S107), the process returns to step S102.

  In step S108, the setting unit 201 sets correction values for the amplitude / phase adjustment units 141 to 14n based on the relative values of the amplitude and phase of the transmission antenna elements 351 to 35n stored in step S105 (S109).

  In this manner, the transmission antenna elements 351 to 35n are corrected to have uniform amplitude and phase.

  After performing the above correction, the setting unit 201 sets the amplitude and phase so as to form a desired radiation pattern for the digital beam forming processing units 121 to 12n.

  In the first embodiment, the digital beam forming circuit 12 also functions as the amplitude / phase adjusting units 141 to 14n of the present embodiment.

As described above, the digital radio repeater 50 of the present embodiment has a simple configuration with one reception system, and can measure the inter-element deviations of a plurality of transmission antennas of a plurality of transmission antennas.
[Third Embodiment]
Next, a third embodiment will be described with reference to FIGS. 7 to 9 and FIG.
[Description of configuration]
7 to 9 and FIG. 5 show configuration examples of the present embodiment.

  Referring to FIG. 7, the digital radio repeater 60 of this embodiment includes a user link processing device 1000, a control unit 200, a user link transmission unit 300, a user link transmission antenna 350, a measurement reception unit 400, and a measurement reception antenna 450. Is provided. The digital radio repeater 50 further includes a feeder link receiving unit 5000 and a feeder link receiving antenna 550.

  Details of the user link processing apparatus 1000 and the control unit 200 are shown in FIG. Details of the feeder link receiving unit 5000 and the feeder link receiving antenna 550 are shown in FIG. Details of the user link transmission unit 300, the user link transmission antenna 350, the measurement reception unit 400, and the measurement reception antenna 450 are the same as those in FIG. 5 of the second embodiment.

  The configuration of the feeder link reception antenna 550 is the same as that of the feeder link reception antenna 550 of the second embodiment, and thus description thereof is omitted.

  Next, the feeder link receiving unit 5000 will be described with reference to FIG.

  In the feeder link receiving unit 5000, an intermediate frequency (IF) synthesizer 5004 is added to the output of the bandpass filter 503 in addition to the components of the feeder link receiving unit 500 of the second embodiment. The intermediate frequency synthesizer 5004 is a power synthesizer that synthesizes an intermediate frequency signal.

  Then, the intermediate frequency synthesizer 5004 synthesizes the signal from the band pass filter 503 and the signal from the measurement receiving unit 400 shown in FIG.

  Next, the configuration of the user link processing apparatus 1000 will be described with reference to FIG.

  The difference in configuration between the user link processing apparatus 1000 and the user link processing apparatus 100 of the second embodiment is as follows.

  In the user link processing device 100 of the present embodiment, the following constituent elements included in the user link processing device 100 of the second embodiment are deleted.

  That is, the AD converter 111, the quadrature demodulator 112, the low-pass filter 113, the extraction processing unit 114, and the data acquisition unit 115 are deleted.

  A data acquisition unit 108 is connected to a signal line of an orthogonal signal input to the digital beam forming processing unit 121. The data acquisition unit 108 acquires the amplitude and phase of the signal according to instructions from the control unit 200.

  Other components of the user link processing apparatus 1000 are the same as the components of the user link processing apparatus 100 of the second embodiment.

  Next, since the configuration of the user link transmission unit 300 is the same as that of the user link transmission unit 300 of the second embodiment, description thereof is omitted.

  The configuration of the user link transmission antenna 350 is the same as that of the user link transmission antenna 350 of the second embodiment, and thus the description thereof is omitted.

  Furthermore, since the configuration of the measurement receiving unit 400 is the same as that of the measurement receiving unit 400 of the second embodiment, description thereof is omitted.

Next, the configuration of the control unit 200 is the same as that of the control unit 200 of the second embodiment. However, the connection destination of the measurement value storage unit 204 is the data acquisition unit 115 in the second embodiment. However, since the connection destination of the present embodiment is the data acquisition unit 108, the measurement value storage unit 204 stores the connection destination. The data is data acquired by the data acquisition unit 108.
[Description of operation]
In the digital radio repeater 60 of this embodiment, the functions of the AD converter 111, the quadrature demodulator 112, the low-pass filter 113, and the extraction processing unit 114 of the second embodiment are the following components of the digital radio repeater 1000: Shared with. That is, it is shared with the AD converter 101, the quadrature demodulator 102, the low-pass filter 103, and the demultiplexing processing unit 104.

  Then, the frequency converter 502 converts the reference signal received by the feeder link receiving antenna 550 into an intermediate frequency different from the measurement signal. This signal is also referred to as a first signal. The signal output from the measurement receiver 400 is also referred to as a second signal.

  The first signal and the second signal are demodulated into orthogonal signals by the orthogonal demodulator 102, respectively. The first signal demodulated orthogonally is also referred to as a third signal. The second signal demodulated orthogonally is also referred to as a fourth signal.

  The demultiplexing processing unit 104 sends out the frequency-demultiplexed measurement signal to the digital beam forming processing unit 121. Further, the demultiplexing processing unit 104 transmits the frequency-demultiplexed reference signal to the digital beam forming processing unit 12n.

  Then, the data acquisition unit 107 acquires measurement value data.

  The data acquisition unit 108 acquires reference value data.

  The other operations are the same as those in FIG. 6 described in the second embodiment. By replacing the data acquisition unit 115 in step S103 in FIG. 6 with the data acquisition unit 108, the same operations as in the second embodiment are realized. Is done.

  As described above, the digital radio repeater 60 of the present embodiment has a smaller number of components than the digital radio repeater 50 of the second embodiment, and a plurality of transmission antennas as in the second embodiment. It is possible to measure the deviation between elements of a plurality of transmitting antennas.

DESCRIPTION OF SYMBOLS 10 Phased array antenna 11 Distribution circuit 12 Digital beam forming circuit 13 Quadrature modulator 14 DA converter 15 Transmission means 16 Reception means 17 AD converter 18 Orthogonal demodulator 19 Storage means 20 Control means 21, 2n Transmission antenna element 31 Reception antenna element 351, 352, 35n Transmitting antenna element 50 Digital wireless repeater 60 Digital wireless repeater 100 User link processing device 101 AD converter 102 Orthogonal demodulator 103 Low pass filter 104 Demultiplexing processing unit 105 Exchange processing unit 106 Generation unit 107 Data acquisition unit 108 Data acquisition unit 111 AD converter 112 Quadrature demodulator 113 Low pass filter 114 Extraction processing unit 115 Data acquisition unit 121, 122, 12n Digital beam forming processing unit 131, 132, 13n Multiplexing processing unit 141, 14 , 14n Amplitude / phase adjusting units 151, 152, 15n Quadrature modulators 161, 162, 16n DA converter 200 Control unit 201 Setting unit 202 Instruction unit 203 Reference value storage unit 204 Measurement value storage unit 205 Relative value calculation unit 206 Relative value Storage unit 300 User link transmission unit 311 Frequency conversion unit 312 Frequency conversion unit 321 Transmission system 322 Transmission system 350 User link transmission antennas 351, 352, and 35n Transmission antenna element 400 Measurement reception unit 401 Amplifier 402 Frequency conversion unit 403 Band pass filter 450 Measurement receiving antenna 500 Feeder link receiving unit 501 Amplifier 502 Frequency converter 503 Band pass filter 550 Feeder link receiving antenna 1000 User link processing device 1000 Digital wireless repeater 5000 Feeder link receiving unit 5004 Intermediate frequency synthesizer

Claims (6)

A distribution circuit for distributing a reference orthogonal signal;
A digital beamforming (DBF) circuit for controlling and outputting the amplitude and phase of the output of the distribution circuit;
A quadrature modulator that quadrature modulates the output of each DBF circuit;
A DA converter that DA converts the output of the quadrature modulator;
Transmitting means for transmitting the output of the DA converter;
A transmitting antenna element connected to the transmitting means;
One receiving antenna element;
Receiving means for receiving a signal received by the receiving antenna element;
An AD converter for AD converting the output of the receiving means;
An orthogonal demodulator that orthogonally demodulates the output of the AD converter;
Storage means for storing the reference quadrature signal and the output of the quadrature demodulator at the same time;
A signal is sequentially output for each of the DBF circuits,
Based on the difference between the reference quadrature signal stored in the storage means and the output signal of the quadrature demodulator at the same time, an amplitude and phase difference between different antenna elements and a correction coefficient are obtained, and the DBF circuit includes the A phased array antenna, comprising: a control unit that performs correction based on a correction coefficient. A phased array antenna according to claim 1;
One feeder link receive antenna;
Second receiving means for receiving a signal received by the feeder link receiving antenna;
A second AD converter for AD converting the output of the receiving means;
A second quadrature demodulator that quadrature demodulates the output of the second AD converter,
The digital radio repeater according to claim 1, wherein the reference quadrature signal is generated based on an output of the second quadrature demodulator. One feeder link receive antenna;
First receiving means for receiving an orthogonal modulation signal received by the feeder link receiving antenna;
A synthesizer for combining a first signal obtained by converting the output of the first receiving means into an intermediate frequency and a second signal obtained by converting the output of the second receiving means into an intermediate frequency different from the first signal; ,
An AD converter for AD converting the output of the synthesizer;
An orthogonal demodulator that orthogonally demodulates the output of the AD converter;
A demultiplexing processing unit that demultiplexes the signal output from the quadrature demodulator for each frequency;
An exchange processing unit for distributing the output of the demultiplexing processing unit to a desired connection destination;
A digital beam forming (DBF) circuit for controlling and outputting the amplitude and phase of the output of the exchange processing unit;
A quadrature modulator that quadrature modulates the output of each DBF circuit;
A DA converter that DA converts the output of the quadrature modulator;
Transmitting means for transmitting the output of the DA converter;
A transmitting antenna element connected to the transmitting means;
One receiving antenna element;
The second receiving means for receiving a signal received by the receiving antenna element;
The first signal is demodulated by the quadrature demodulator and distributed by the switching processor, and the second signal is demodulated by the quadrature demodulator and distributed by the switching processor. Storage means for storing the fourth signal at the same time;
A signal is sequentially output for each of the DBF circuits,
Based on the fourth signal at the same time as the third signal stored in the storage means, the difference between the amplitude and phase of different antenna elements and the correction coefficient are obtained, and the DBF circuit is based on the correction coefficient. A digital wireless repeater comprising: a control unit that performs correction. The reference quadrature signal is distributed and each quadrature modulated and DA converted signal is sequentially transmitted to each of a plurality of transmitting antenna elements,
The signal transmitted from the transmitting antenna element is received by one receiving antenna element,
An amplitude and phase difference between different transmitting antenna elements and a correction coefficient are obtained based on the reference orthogonal signal at the same time as the orthogonal signal demodulated orthogonally after AD conversion of the received signal. Inter-element deviation measurement method. The method for measuring the deviation between elements of the phased array antenna provided in the digital wireless repeater is as follows:
The element of the phased array antenna according to claim 4, wherein the reference quadrature signal is a reference quadrature signal generated by subjecting the quadrature modulation signal received by one feeder link receiving antenna to AD conversion and then quadrature demodulation. Inter-deviation measurement method. Distributes a reference quadrature signal generated by performing quadrature demodulation after AD conversion of an output obtained by synthesizing the first quadrature modulated signal and the second quadrature modulated signal received by one feeder link receiving antenna and converted to an intermediate frequency Then, each of the plurality of transmitting antenna elements sequentially transmits a signal that is orthogonally modulated and DA-converted, and a signal transmitted from the transmitting antenna element is received by one receiving antenna element to be converted into an intermediate frequency. The plurality of transmitting antenna elements based on the quadrature signal generated by performing the quadrature demodulation after performing the synthesis as the second quadrature modulation signal and AD-converting the synthesized output, and the reference quadrature signal at the same time A method for measuring an inter-element deviation of a phased array antenna of a digital radio repeater, characterized in that a difference between an amplitude and a phase and a correction coefficient are obtained.

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