JP4241307B2 - Receiving apparatus having a plurality of antennas and method for amplifying received signals of a plurality of antennas - Google Patents

Description

  The present invention relates to a receiving apparatus that improves reception quality using a plurality of antenna elements. The present invention is particularly effective for improving reception quality in a mobile body in which the communication environment is extremely fluctuating. The present invention is remarkably effective when receiving a television broadcast in a vehicle traveling on a highway.

  In general, in the AGC (auto gain control) that adjusts the input to an optimum level at the front stage of the receiver with respect to the fluctuation of the signal received from the antenna, the relationship between the AGC control voltage and the amplification factor for the input signal (AGC characteristic) is not linear in a wide range (FIG. 5). For this reason, the system becomes unstable in the portion where the slope of the gain of the AGC characteristic is steep (the range indicated as C in FIG. 5), and conversely, in the place where the AGC characteristic is gentle (the range indicated as A in FIG. 5). Since the control becomes slow and the followability of the system is deteriorated, AGC control using only a portion close to linear (range indicated by B in FIG. 5) has been performed.

  Now, in a receiving apparatus that uses a plurality of antennas and uses a signal combining technique based on weighting such as diversity or adaptive array to improve reception quality, this AGC control is required for each received signal of each antenna. Here, FIG. 6 shows a configuration in which AGC control is simply performed for each antenna series (branch).

  FIG. 6 is a block diagram illustrating a configuration of a receiving device 9000 having four antennas A1 to A4. The receiving device 9000 corresponds to four antennas A1 to A4, analog multipliers 21 to 24, variable amplification factor analog amplifiers 31 to 34, analog to digital converters 41 to 44, complex digital multipliers 71 to 74, control voltage. It has generation parts 91-94. Further, it has a local oscillator 10, a digital orthogonal demodulator 50, a directivity synthesis weight calculator 60, and a complex adder 80. Among these, the inside of the digital quadrature demodulating unit 50 generates a total of eight digital multipliers provided for each of the branches 1 to 4 in pairs, and two digital sine waves whose phases are shifted by π / 2. However, since it is a well-known configuration, details of the digital orthogonal demodulator 50 are not shown in each drawing.

  The control voltage generators 91 to 94 all have the same configuration, and include an amplitude time average calculator 910, a comparator 930, a reference value storage device 940, an amplifier control voltage calculator 950, and a digital / analog converter 960. The The variable amplification factor analog amplifier 3i and the control voltage generator 9i (i is an integer of 1 to 4) each form an AGC.

  In the receiving device 9000, the following signal processing is performed for each branch i (i is an integer of 1 to 4). First, the high-frequency signal received by the antenna Ai is output to the analog multiplier 2i, multiplied by the analog high-frequency carrier wave output from the local oscillator 10, and converted to an intermediate frequency band. In each figure of the present application, the band filter and the low-pass filter are omitted.

  Next, the output of the analog multiplier 2i is input to the variable amplification factor analog amplifier 3i, and is amplified at a gain according to the control voltage output from the control voltage generator 9i. The output of the variable amplification factor analog amplifier 3i is input to the analog-to-digital converter 4i and becomes a digital signal. The output of the analog-digital converter 4i is digital quadrature demodulated by the digital quadrature demodulator 50, and is output as a complex signal of so-called I signal and Q signal. In each figure, the complex signal of the I signal and the Q signal is represented by a double arrow. The four sets of complex signals of branches 1 to 4 of the digital quadrature demodulator 50 are output to the complex digital multipliers 71 to 74, and are also sent to the weight calculator 60 for directivity synthesis and the control voltage generators 91 to 94. Is output.

  Each complex digital multiplier 7i performs complex multiplication of the complex weight from the directivity synthesis weight calculator 60 and the complex signal composed of the I signal and the Q signal. The outputs of the four sets of the complex digital multipliers 71 to 74 are added by the complex adder 80, and as a set of I signals and Q signals, a directivity synthesis weight calculator 60 and a subsequent signal processing unit. Is output.

  The complex weight in the directivity synthesis weight calculator 60 is performed by, for example, maximum ratio synthesis. At this time, since the phase is also considered, the four weighting factors are output to the complex digital multipliers 71 to 74 as complex signals.

  In the case of the receiving device 9000 in FIG. 6, control is performed so that the signal level of each branch is optimized. However, the maximum ratio combining that combines a plurality of signals according to the reception power ratio at the antenna end of each branch. When performing signal processing, it is necessary to transmit AGC control information for each branch, that is, a control voltage, to the weighting calculator 60 for directivity synthesis. Therefore, there is a problem that the system becomes very complicated.

In a system that uses a plurality of branches to improve reception quality, there is a so-called common AGC method in which AGCs of a plurality of branches are commonly controlled by a single control voltage. This is shown in FIG. 7 as a block diagram. 7 replaces the control voltage generation units 91 to 94 of the reception device 9000 of FIG. 6 with one control voltage generation unit 900, and controls the variable gain analog amplifiers 31 to 34 with a common control voltage at all times. To do. The control voltage generator 900 includes amplitude time average calculators 911 to 914 corresponding to the branches 1 to 4, a maximum value detector 920, a comparator 930, a reference value storage device 940, an amplifier control voltage calculator 950, and a digital / analog converter. 960. The control voltage generation unit 900 can amplify all the branches uniformly according to the maximum one of the amplitudes of the branches 1 to 4. Since all branches are uniformly amplified, there is no need to input control voltage information to the weighting calculator 60 for directivity synthesis.
JP 2000-209138 A JP 2000-261405 A

  In the method of FIG. 7, AGC control is performed so that the signal level of the branch having the maximum received power among the plurality of branches is constant. In this branch common AGC method using the signal level of the branch with the maximum received power, when the maximum amplitude changes instantaneously, the change of the maximum branch is large, and when the fluctuation of the radio wave environment is severe as in high-speed driving, Control stability can be a problem.

  Accordingly, an object of the present invention is to provide a receiver that improves reception quality by using such a plurality of antennas, with a simple configuration, and against a severe fluctuation in the radio wave environment when moving at high speed in an automobile or the like. Is to provide a stable AGC control system.

In order to solve the above-described problem, the means according to claim 1 is a receiving device that has a plurality of antennas, and combines a plurality of received signals into one to perform signal processing. A control voltage generation unit that has a gain variable analog amplifier capable of controlling the gain for each of the plurality of antennas and generates one control voltage for controlling all the gain variable analog amplifiers, The control voltage generating unit is a control voltage for determining the control voltage by comparing an output of the total average calculator and an amplitude threshold with a total average calculator that calculates a certain time average of the amplitudes of the signals of all antennas. possess a calculator, in the control voltage calculator, trial voltage is increased or decreased linearly is determined by the difference between the output and the amplitude threshold of the total average calculator, the provisional voltage, the amplification factor variable analog amplifier In And converting the control voltage by the inverse function of the function of the gain for your voltage.

According to a second aspect of the present invention, in addition to the means of the first aspect, the control voltage generation unit includes a combined signal time average calculator that calculates an average of amplitudes of the combined signals, and a combined signal time. by comparing the output amplitude threshold average calculator, conversion example placed having a control voltage calculator for determining said control voltage, the control voltage calculator, an output of the synthesized signal time average calculator The provisional voltage is linearly increased / decreased by a difference from the amplitude threshold value, and the provisional voltage is determined and converted into a control voltage by an inverse function of a function of the amplification factor with respect to the control voltage in the amplification factor variable analog amplifier .

According to a third aspect of the present invention, in a receiving apparatus that has a plurality of antennas and synthesizes a plurality of received signals into one to perform signal processing, the gain can be controlled by a control voltage. A gain variable analog amplifier is provided for each of the plurality of antennas, and includes a control voltage generator that generates one control voltage for controlling all the gain variable analog amplifiers. , provided corresponding to the number of each antenna, and time average calculator for averaging the amplitude of the signal a predetermined time, and the total average calculator for calculating an average of the amplitudes of all the antennas the output of all the time average calculator The average of the amplitude of the synthesized signal is calculated, and the output of all the time average calculators is monitored, and if there is no abnormality in the output of all the time average calculators, the total average With the output of the calculator The control voltage is determined by comparison with a width threshold value, and if there is an abnormality in the output of the time average calculator, the control voltage is calculated by comparing the output of the synthesized signal time average calculator with the amplitude threshold value. also because it has a determining control voltage calculator. Here, “no abnormality in the output of all time average calculators” or “abnormal” can be set arbitrarily, but for example, there is a case where each output is less than a certain value Or the case where the difference or ratio of the maximum value of each output and minimum value exceeds a fixed value can be made abnormal.

According to a fourth aspect of the present invention, in the control voltage calculator, the difference between the output of the total average calculator used to determine the control voltage or the output of the combined signal time average calculator and the amplitude threshold is used. A provisional voltage is determined by linearly increasing / decreasing, and the provisional voltage is converted into the control voltage by an inverse function of a function of an amplification factor with respect to the control voltage in the amplification factor variable analog amplifier.

According to a fifth aspect of the present invention, there is provided the method for amplifying the plurality of reception signals in a reception apparatus that performs signal processing by combining a plurality of reception signals received by a plurality of antennas into one. the amplitude of the signal averaged certain time, they and all average value, the value obtained by averaging a certain time the amplitude of the combined signal to the plurality of received signals, and selecting one, and the selected value A comparison is made with the amplitude threshold value to amplify all received signals with the same amplification factor. The present invention is an invention of an amplification method corresponding to the device invention of claim 3 .

Since the time average of the amplitudes of all branches is calculated and averaged, fluctuations in the amplitude of each branch do not greatly change the control voltage of the AGC directly. And stable AGC control can be realized (claims 1 and 3). Alternatively, since the AGC control is performed based on the amplitude of the combined signal, even if there is a branch of the received signal that is small enough to be buried in noise, an appropriate AGC control can be realized (claims 2 and 3). If these are automatically switched, a receiving apparatus having both of these advantages can be obtained. The essence of the present invention is such an amplification method, and the amplification method itself has these effects (claim 5). According to the invention of claim 1, 2, or 4 , it is possible to realize a wide dynamic range. Thus, AGC control can be realized stably with a simple circuit configuration even in mobile reception where the radio wave environment is intense and fluctuates in a wide dynamic range.

  Hereinafter, specific embodiments of the present invention will be described with reference to block diagrams. In addition, this invention is not limited to a following example.

  FIG. 1 is a block diagram showing a configuration of a receiving apparatus 1000 having four antennas A1 to A4 according to a specific first embodiment of the present invention. The receiving apparatus 1000 includes analog multipliers 21 to 24, amplification factor variable analog amplifiers 31 to 34, analog / digital converters 41 to 44, and complex digital multipliers 71 to 74 corresponding to the four antennas A1 to A4. ing. In the following, a collection of devices for each branch may be simply expressed as branches 1 to 4, respectively. What is not provided for each of the branches 1 to 4 is a local oscillator 10, a digital orthogonal demodulator 50, a directivity synthesis weight calculator 60, a complex adder 80, and a control voltage generator 100. Among these, the inside of the digital quadrature demodulating unit 50 generates a total of eight digital multipliers provided for each of the branches 1 to 4 in pairs, and two digital sine waves whose phases are shifted by π / 2. However, since it is a well-known configuration, details of the digital orthogonal demodulator 50 are not shown in each drawing.

  The control voltage generator 100 includes amplitude time average calculators 111 to 114 corresponding to the branches 1 to 4, all branch average calculators 120, a comparator 130, a reference value storage device 140, an amplifier control voltage calculator 150, and digital / analog conversion. The device 160 is configured.

  In the receiving apparatus 1000, the following signal processing is performed for each branch i (i is an integer of 1 to 4). First, the high-frequency signal received by the antenna Ai is output to the analog multiplier 2i, multiplied by the analog high-frequency carrier wave output from the local oscillator 10, and converted to an intermediate frequency band. In each figure of the present application, the band filter and the low-pass filter are omitted.

  Next, the output of the analog multiplier 2 i is input to the variable amplification factor analog amplifier 3 i, and is amplified with a gain according to the same control voltage output from the control voltage generator 100. The output of the variable amplification factor analog amplifier 3i is input to the analog-to-digital converter 4i and becomes a digital signal. The output of the analog-digital converter 4i is digital quadrature demodulated by the digital quadrature demodulator 50, and is output as a complex signal of so-called I signal and Q signal. In each figure, the complex signal of the I signal and the Q signal is represented by a double arrow. The four sets of complex signals in the branches 1 to 4 of the digital orthogonal demodulator 50 are output to the complex digital multipliers 71 to 74 and also output to the directivity synthesis weight calculator 60 and the control voltage generator 100. The

  Each complex digital multiplier 7i performs complex multiplication of the complex weight from the directivity synthesis weight calculator 60 and the complex signal composed of the I signal and the Q signal. The outputs of the four sets of the complex digital multipliers 71 to 74 are added by the complex adder 80, and as a set of I signals and Q signals, a directivity synthesis weight calculator 60 and a subsequent signal processing unit. Is output.

  The complex weight in the directivity synthesis weight calculator 60 is performed by, for example, maximum ratio synthesis. At this time, since the phase is also considered, the four weighting factors are output to the complex digital multipliers 71 to 74 as complex signals.

  The signal processing inside the control voltage generator 100 is as follows. The four sets of complex signals of branches 1 to 4 are input to the amplitude time average calculators 111 to 114 corresponding to the branches 1 to 4, and the time average of the amplitude is calculated for each. In this calculation, an average amplitude that is a real number is output from the values of a complex number of I and Q signals. Next, the average value of the four average amplitudes output from the amplitude time average calculators 111 to 114 is calculated by the all branch average calculator 120. This value is compared with the reference value (threshold value) stored in the reference value storage device 140 in the comparator 130, and the difference is output to the amplifier control voltage calculator 150. In the amplifier control voltage calculator 150, one control voltage for simultaneously controlling all of the variable gain analog amplifiers 31 to 34 is generated and output to the digital / analog converter 160. In the digital-analog converter 160, the same potential is applied to all of the variable amplification factor amplifiers 31 to 34 using the control voltage as an analog potential.

  According to the present embodiment, the number of signal samples used for the signal level calculation is smaller than the number of branches when the AGC is controlled individually for each branch in the conventional case or compared to the branch common AGC method using the signal level of the maximum received power branch. Since it is twice as large, it is less affected by noise and instantaneous changes in the surrounding radio wave environment, and very stable AGC control can be realized against drastic fluctuations in the received signal at the antenna end.

The present embodiment is a specific embodiment of the invention according to claim 1, and the amplitude time average calculators 111 to 114 and the all branch average calculator 120 are replaced by the total average calculator, the comparator 130, and the reference value storage device 140. The amplifier control voltage calculator 150 corresponds to a control voltage calculator. Note that the method of calculating the control voltage of the amplifier control voltage calculator 150 according to the fourth embodiment and FIG. 4 corresponds to the invention according to claim 1.

  In the first embodiment, when the input signal power of each branch is substantially equal on average, the operation is most effective as compared with the conventional method. However, when the input is extremely imbalanced among a plurality of branches, for example, when a state where one branch out of two branches cannot be received at all continues, the AGC using the average value of all the branches is used. In the control, the signal level of one branch is doubled as desired, and saturation may occur at the input to the receiver. Furthermore, in the same situation, when a plurality of branches are combined at the maximum ratio in the receiver, the combined signal level is doubled as desired, which may cause reception failure.

  Therefore, in the branch common AGC control method in which AGCs of a plurality of branches are commonly controlled by one control voltage, the AGC control voltage is determined so that the level of the combined signal after the maximum ratio combining in the receiver is constant. This is the present embodiment. FIG. 2 is a block diagram showing a configuration of a receiving apparatus 2000 having four antennas A1 to A4 according to a specific second embodiment of the present invention. The receiving device 2000 shown in the figure is the same as the receiving device 1000 in the first embodiment shown in FIG. 1 except that the configuration of the control voltage generation unit 200 and the signal input source are different as follows. Are given the same reference numerals.

  The control voltage generation unit 200 in FIG. 2 includes four amplitude time average calculators 111 to 114 and all branch average calculators 120 of the configuration of the control voltage generation unit 100 in FIG. In this case, the input to the amplitude time average calculator 210 is used as the output of the complex adder 80.

  The receiving apparatus 2000 of FIG. 2 has an effect that proper AGC control can be performed even when the imbalance of input signals between a plurality of branches is maintained with respect to the receiving apparatus 1000 of FIG.

The present embodiment is a specific embodiment of the invention according to claim 2, and the amplitude time average calculator 210 is a combined signal time average calculator, a comparator 130, a reference value storage device 140, and an amplifier control voltage calculator 150. Corresponds to a control voltage calculator. Note that the method of calculating the control voltage of the amplifier control voltage calculator 150 according to the fourth embodiment and FIG. 4 corresponds to the invention according to claim 2.

  However, when the radio wave environment fluctuates drastically, such as when driving at high speed, the receiver 2000 of FIG. 2 may have a problem with stability.

  Therefore, when there is no extreme imbalance in the input signal between the multiple branches, AGC control is performed with the average value of the signal levels of all the branches, while the input signal level between the multiple branches is extremely unbalanced. In the present embodiment, adaptive switching is performed so that AGC control is performed at the average level after the maximum ratio combining. FIG. 3 is a block diagram showing a configuration of a receiving device 3000 having four antennas A1 to A4 according to a specific third embodiment of the present invention. The receiving device 3000 shown in the figure is the same except that the configuration of the control voltage generator 300 is as follows in order to combine the receiving device 1000 of the first embodiment of FIG. 1 and the receiving device 2000 of the second embodiment of FIG. The same components are denoted by the same reference numerals.

  The control voltage generation unit 300 in FIG. 3 first includes four amplitude time average calculators 111 to 114, all-branch average calculator 120, and control voltage generation in FIG. 2 in the configuration of the control voltage generation unit 100 in FIG. An amplitude time average calculator 210 having the configuration of the unit 200 is included. The inputs to these are the same as in FIGS. 3 further includes a determination unit 310 and a selection unit 320.

  The outputs of the four amplitude time average calculators 111 to 114 are also input to the determiner 310, where signal abnormality is determined. That is, it is determined whether there is no branch having an extremely weak amplitude compared with the amplitude of other branches among the outputs of the amplitude time average calculators 111 to 114. A determination signal indicating abnormality or normality as a determination result is output to the selector 320.

  The outputs of all branch average calculator 120 and amplitude time average calculator 210 are input to selector 320, and the output to comparator 130 is switched by the determination signal from determiner 310. First, when the determination signal is normal, that is, compared with the amplitudes of other branches, or when there is no branch having an extremely weak amplitude, the output of all branch average calculator 120 is output to comparator 130. On the other hand, when the determination signal is abnormal, that is, when there is a branch having an extremely weak amplitude compared with the amplitude of another branch, the output of the amplitude time average calculator 210 is output to the comparator 130.

  The receiving device 3000 in FIG. 3 does not maintain an extreme imbalance in the input level between branches, and in a normal receiving environment, the number of signal samples used for signal level calculation is increased by the number of branches. It is less affected by instantaneous changes in the environment, and very stable AGC control can be realized against drastic fluctuations in the received signal at the antenna end. In addition, proper AGC control can be performed even in a special reception environment in which an imbalance of input signals between a plurality of branches is maintained.

  This embodiment is a specific embodiment of the invention according to claim 3, in which the amplitude time average calculators 111 to 114 are the time average calculator, the all branch average calculator 120 is the all average calculator, and the amplitude time average is The arithmetic unit 210 corresponds to the combined signal time average arithmetic unit, and the determination unit 310, the selector 320, the comparator 130, the reference value storage device 140, and the amplifier control voltage calculator 150 correspond to the control voltage arithmetic unit.

  In each of the above embodiments, it is preferable to use a characteristic conversion table so that the amplification factor of the variable amplification factor analog amplifier 3i is linear with respect to a signal having a difference between the amplitude and the threshold value. This will be described with reference to FIG. The characteristics of the control voltage (V) and gain (dB) of the variable gain analog amplifier 3i are shown in FIG. If it is like B, it corresponds to the inverse function of this function, FIG. A characteristic conversion table of provisional voltage (V) and control voltage (V) such as A is prepared. First, the temporary voltage is linearly increased / decreased by a signal indicating the difference between the amplitude output from the comparator 130 and the threshold value. If this temporary voltage is directly used as the control voltage of the variable gain analog amplifier 3i, then FIG. Only a portion with a narrow linear portion and a narrow dynamic range such as B can be used. However, this temporary voltage is converted into a characteristic conversion table as shown in FIG. When converted to a control voltage and output to the variable gain analog amplifier 3i as in A, the relationship between the temporary voltage and the gain is shown in FIG. It becomes linear as in C, and stable AGC control is possible over a wide dynamic range. In other words, the portion where the slope of the amplification factor of the AGC characteristic is steep indicates that the change in the amplification factor is large relative to the change in the AGC control voltage. On the contrary, in a portion where the slope of the gain of the AGC characteristic is gentle, that is, in a portion where the change of the gain is small relative to the change of the AGC control voltage, the change of the AGC control voltage is largely controlled with respect to the error signal. is there. In this way, by adjusting the amount of change in the AGC control voltage with respect to the error signal according to the AGC characteristic, the relationship between the error signal and the gain of the AGC becomes linear, and the control can be stabilized.

This embodiment corresponds to a specific embodiment of the invention according to claims 1, 2, and 4 .

  INDUSTRIAL APPLICABILITY The receiving apparatus and amplification method of the present invention are particularly useful when viewing digital television broadcasts in vehicles traveling in urban areas and vehicles traveling on highways.

The block diagram which shows the structure of the receiver which concerns on the specific 1st Example of this invention. The block diagram which shows the structure of the receiver which concerns on the specific 2nd Example of this invention. The block diagram which shows the structure of the receiver which concerns on the specific 3rd Example of this invention. The graph which shows the relationship between the control voltage and amplification factor which concern on the specific 4th Example of this invention. The graph which shows the relationship between the control voltage and gain in AGC The block diagram which shows the structure of the receiver which has the conventional several antenna. The block diagram which shows the structure of the other receiving apparatus which has the some conventional antenna.

Explanation of symbols

1000, 2000, 3000: receiving device 10: local oscillator 21-24: analog multiplier 31-34: variable gain analog amplifier 41-44: analog-digital converter 50: digital orthogonal demodulator 60: weight calculation for directivity synthesis Units 71 to 74: Complex digital multiplier 80: Complex adder 100, 200, 300: Control voltage generators 111 to 114, 210: Amplitude time average calculator 120: All branch average calculator 130: Comparator 140: Reference value Storage device 150: Amplifier control voltage calculator 160: Digital-analog converter 310: Determinator 320: Selector

Claims (5)

In a receiving apparatus that has a plurality of antennas and performs signal processing by combining a plurality of reception signals received thereby,
An amplification factor variable analog amplifier capable of controlling the amplification factor by a control voltage is provided for each of the plurality of antennas.
A control voltage generating unit that generates one control voltage for controlling all of the gain variable analog amplifiers;
The control voltage generator is
A total average calculator that calculates the average of the signal amplitudes of all antennas for a certain period of time;
By comparing the output with the amplitude threshold of the total average calculator, it has a control voltage calculator for determining said control voltage,
In the control voltage calculator, a provisional voltage is determined by linear increase / decrease depending on the difference between the output of the total average calculator and the amplitude threshold value, and the provisional voltage is converted into the control voltage in the variable gain analog amplifier. A receiving apparatus having a plurality of antennas, wherein the control voltage is converted by an inverse function of a function of an amplification factor with respect to . In a receiving apparatus that has a plurality of antennas and performs signal processing by combining a plurality of reception signals received thereby,
An amplification factor variable analog amplifier capable of controlling the amplification factor by a control voltage is provided for each of the plurality of antennas.
A control voltage generating unit that generates one control voltage for controlling all of the gain variable analog amplifiers;
The control voltage generator is
A combined signal time average calculator for calculating the average of the amplitudes of the combined signals;
By comparing the combined signal time average calculator and the output of the amplitude threshold, it has a control voltage calculator for determining said control voltage,
In the control voltage calculator, a temporary voltage is determined by linear increase / decrease depending on the difference between the output of the combined signal time average calculator and the amplitude threshold value, and the temporary voltage is determined in the gain variable analog amplifier. A receiving apparatus having a plurality of antennas, wherein the receiving voltage is converted into the control voltage by an inverse function of an amplification factor function with respect to the control voltage . In a receiving apparatus that has a plurality of antennas and performs signal processing by combining a plurality of reception signals received thereby,
An amplification factor variable analog amplifier capable of controlling the amplification factor by a control voltage is provided for each of the plurality of antennas.
A control voltage generating unit that generates one control voltage for controlling all of the gain variable analog amplifiers;
The control voltage generator is
A time average calculator provided corresponding to the number of each antenna, which averages the amplitude of the signal for a certain period of time;
A total average calculator that calculates the average of all antenna amplitudes from the outputs of all time average calculators;
A combined signal time average calculator for calculating the average of the amplitudes of the combined signals;
Monitor the output of all time average calculators, if there is no abnormality in the output of all time average calculators, determine the control voltage by comparing the output of all average calculators and the amplitude threshold, A plurality of control voltage calculators for determining the control voltage by comparing the output of the combined signal time average calculator and the amplitude threshold value when there is an abnormality in the output of the time average calculator. Receiving apparatus having an antenna. In the control voltage calculator, the provisional voltage is linearly increased or decreased by the difference between the output of the total average calculator used to determine the control voltage or the output of the combined signal time average calculator and the amplitude threshold value. The plurality of antennas according to claim 3 , wherein the provisional voltage is converted into the control voltage by an inverse function of a function of an amplification factor with respect to the control voltage in the amplification factor variable analog amplifier. Receiver device. In a receiving apparatus that performs signal processing by combining a plurality of received signals received by a plurality of antennas into one, the method for amplifying the plurality of received signals,
A value obtained by averaging all of the amplitudes of the plurality of received signals for a certain period of time;
With a value obtained by averaging the amplitude of a signal obtained by synthesizing the plurality of received signals for a certain period of time ,
A method of amplifying a reception signal of a plurality of antennas , wherein either one is selected, the selected value is compared with an amplitude threshold value, and all reception signals are amplified with the same amplification factor.

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