JP2008301300A - Array antenna apparatus and control method thereof, radio receiver, integrated circuit, program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an adverse effect of a disturbance by an adjacent channel radio wave in an FM broadcast receiver having a plurality of antennas to stabilize the operation and performance thereof. <P>SOLUTION: In case of the disturbance by the adjacent channel radio wave, a disturbance signal extraction unit 10 extracts an adjacent wave, and a false desired signal addition unit 11 generates and adds a false desired signal always having higher electric field intensity than the adjacent wave to create a state wherein the desired wave is larger than the adjacent wave even in a reception radio wave state wherein the adjacent wave has larger electric field intensity than the desired wave, so adaptive control by CMA can prevent the adjacent wave from being received suppressing the desired wave, so that the desired wave can be received by suppressing the adjacent wave. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an array antenna apparatus using a plurality of antennas, a control method thereof, and the like, and particularly to an FM radio receiver mounted on a moving body such as a vehicle.

  Conventionally, in an FM radio receiver mounted on a moving body such as a vehicle, a plurality of radio receivers are installed at a predetermined distance in order to cope with a reception radio wave situation that changes every moment and to cope with multipath interference. A diversity scheme is often adopted in which antennas are installed and antennas with good reception are selected.

  In addition, with the recent digitalization of receiving circuits, adaptive control processing using CMA (CONSTANT MODULUS ALGORITHM) combines multiple antenna inputs to generate better received radio waves and receive well in various received radio wave conditions Possible methods have been proposed.

Furthermore, a method that selectively uses both methods, for example, both adaptive control processing for combining two antenna inputs using CMA (CONSTANT MODULUS ALGORITHM) and an antenna diversity processing method are executed. A technique is known in which the influence of multipath interference is reduced by selecting an output having a better state (see Patent Document 1).
JP-A-10-209890

  However, in the configuration of the conventional FM radio receiver that performs adaptive control processing using the CMA, the influence on the reception performance due to the interference caused by the adjacent channel radio wave coming from the FM broadcast station adjacent to the desired FM broadcast station is considered. However, the inventors have found that there are drawbacks as described below.

  That is, there is no particular problem in a good reception situation where the input signal to the CMA receives only radio waves from the desired broadcast station, but in an environment where there are adjacent channel radio waves coming from adjacent broadcast stations, As a CMA algorithm, when receiving a two-wave signal having a constant amplitude, the CMA has a property of suppressing the signal with the lower electric field strength and realizing directivity to receive a higher signal. If the adjacent channel radio wave is stronger, the radio wave from the desired station is suppressed and the radio wave from the adjacent station is received when combining.

  Such problems exist not only in FM broadcasting.

  In consideration of the problems of the conventional radio receiver, the present invention suppresses the radio wave from the adjacent station and improves the radio wave from the desired station even in the situation where the influence of the adjacent channel radio wave from the adjacent station is large. It is an object of the present invention to provide an array antenna apparatus that can receive the signal at once, a control method thereof, and the like.

The first aspect of the present invention is an array antenna apparatus having a plurality of antennas for receiving radio waves, adaptively controlling and outputting each received signal received by the antennas by an adaptive control processing unit that performs CMA processing,
The array antenna apparatus includes a pseudo desired signal adding unit that is provided in a preceding stage of the adaptive control processing unit and adds a pseudo predetermined signal to a desired wave signal included in the received signal.

According to a second aspect of the present invention, the adaptive control processing unit is a unit that performs CMA processing, an adaptive control unit that calculates a weight vector that realizes the best reception state, and a signal that is input using the weight vector. An array synthesis unit to synthesize,
The array antenna according to the first aspect of the present invention, wherein the received signal is input to the pseudo desired signal adding unit and the array synthesizing unit, and an output signal from the pseudo desired signal adding unit is input to the adaptive control unit. Device.

  The third aspect of the present invention is the array antenna apparatus according to the first aspect of the present invention, further comprising an interference signal extraction unit that extracts and outputs an interference signal included in the received signal before the pseudo desired signal addition unit. .

  The fourth aspect of the present invention further includes an interference detection unit that detects an interference signal included in the received signal, and only when the interference detection unit detects the interference signal, the pseudo desired station signal addition unit performs pseudo This is an array antenna apparatus according to the first aspect of the present invention, which adds a predetermined signal.

  The fifth aspect of the present invention further includes a disturbing wave field strength estimating unit that estimates a field strength of a disturbing signal included in the received signal, and the pseudo desired signal adding unit is estimated by the disturbing wave field strength estimating unit. The array antenna apparatus according to the first aspect of the present invention adds a pseudo predetermined signal having an electric field strength corresponding to the electric field strength of an interference wave.

According to a sixth aspect of the present invention, a jamming signal extraction unit that extracts and outputs a jamming signal included in the reception signal is provided before the pseudo desired signal addition unit, and detects the jamming signal included in the reception signal. An interference detection unit that further includes an interference wave electric field strength estimation unit that estimates the electric field strength of the interference signal included in the received signal,
When the interference detection unit detects an interference signal, the interference signal extraction unit extracts the interference signal and outputs the interference signal to the pseudo desired signal addition unit. Add a pseudo predetermined signal having an electric field strength corresponding to the electric field strength of the interference wave estimated by the estimation unit,
In the array antenna device according to the first aspect of the present invention, when the interference detection unit does not detect an interference signal, the interference signal extraction unit and the pseudo desired signal addition unit do not operate and output the input signal as it is. .

  A seventh aspect of the present invention is the array antenna apparatus according to the first aspect of the present invention, wherein the radio wave is an FM radio wave.

The eighth aspect of the present invention has a plurality of antennas for receiving radio waves, and performs CMA processing on each reception signal received by the antennas by either the first adaptive control processing unit or the second adaptive control unit. An array antenna device that performs adaptive control and outputs,
The first stage of the first adaptive control processing unit is provided with a pseudo desired signal adding unit that adds a pseudo predetermined signal to a desired wave signal included in the received signal,
A signal deforming unit that performs a deforming process on the disturbing signal included in the received signal so that the disturbing signal is not constant in amplitude is provided in the previous stage of the second adaptive control processing unit,
A received radio wave condition analysis unit for analyzing the radio wave condition of the received signal;
Based on the analysis result of the received radio wave condition analysis unit, the output from the first adaptive control processing unit in which the pseudo desired signal addition unit is provided in the previous stage and the first in which the signal transformation unit is provided in the previous stage. 2 is an array antenna apparatus including a signal selection unit that selects an adaptive processing result of any of the outputs from the two adaptive control processing units and obtains an adaptive control processing signal.

In a ninth aspect of the present invention, the radio wave is an FM radio wave.
The received radio wave condition analysis unit is an analysis unit that measures how far the received radio wave deviates from the constant amplitude reference,
The signal selection unit selects the result of the adaptive processing of the first adaptive control processing unit when the degree of deviation from the constant amplitude reference is larger, and the degree of deviation from the constant amplitude reference is smaller when the degree of deviation from the constant amplitude reference is smaller. It is the array antenna apparatus of the 8th aspect of this invention which selects the result of the adaptive process of 2 adaptive control processing units.

The tenth aspect of the present invention has a plurality of antennas for receiving radio waves, and performs CMA processing on each reception signal received by the antennas by either the first adaptive control processing unit or the second adaptive control unit. An array antenna device that performs adaptive control and outputs,
The first stage of the first adaptive control processing unit is provided with a pseudo desired signal adding unit that adds a pseudo predetermined signal to a desired wave signal included in the received signal,
A signal deforming unit that performs a deforming process on the disturbing signal included in the received signal so that the disturbing signal is not constant in amplitude is provided in the previous stage of the second adaptive control processing unit,
A reception radio wave condition analysis unit for analyzing the radio wave condition of the received signal;
Based on the analysis result, the received radio wave state analyzing unit is configured to set a set of the pseudo desired signal adding unit and the first adaptive control processing unit, a set of the signal deforming unit and the second adaptive control processing unit. This is an array antenna apparatus that selectively executes any one of the processes.

In an eleventh aspect of the present invention, the radio wave is an FM radio wave.
The reception radio wave condition analysis unit is an analysis unit that measures how far the received radio wave deviates from the constant amplitude reference, and when the degree of deviation from the constant amplitude reference is larger, the pseudo desired signal addition If the degree of deviation from the constant amplitude reference is smaller, the processing of the set of the signal transformation unit and the second adaptive control processing unit is executed. An array antenna apparatus according to a tenth aspect of the present invention.

  A twelfth aspect of the present invention is the array antenna apparatus according to the first aspect of the present invention, wherein the disturbing signal included in the received signal is a broadcast wave from an adjacent station based on the broadcast wave of the desired station.

A thirteenth aspect of the present invention is an array antenna control method comprising a plurality of antennas for receiving radio waves, and combining received signals received by the antennas by adaptive control processing.
An array antenna control method comprising a step of adding a pseudo predetermined signal to a signal of a desired wave included in the received signal before the adaptive control processing.

A fourteenth aspect of the present invention is a radio receiver incorporating the array antenna apparatus of the first aspect of the present invention,
A plurality of frequency converters for frequency-converting outputs from the plurality of antennas, respectively;
A plurality of AD converters for AD converting each output from the frequency converter;
A demodulator that demodulates the signal;
A DA converter for DA converting the demodulated signal;
A speaker for inputting the output from the DA converter,
The pseudo desired signal adding unit adds a pseudo predetermined signal to a signal of a desired wave included in a reception signal output from the AD conversion unit,
The adaptive control unit is a radio receiver that performs adaptive control using an output signal from the pseudo desired signal adder and outputs the signal to the demodulator.

A fifteenth aspect of the present invention is an integrated circuit used in the radio receiver of the fourteenth aspect of the present invention,
An integrated circuit in which the AD converter, the pseudo desired signal adder, the adaptive control unit, the demodulator, and the DA converter are integrated into a single chip.

  In a sixteenth aspect of the present invention, in the array antenna control method of the thirteenth aspect of the present invention, a pseudo predetermined signal is added to a desired wave signal included in the received signal before the adaptive control process. A program for causing a computer to execute steps.

  The seventeenth aspect of the present invention is a recording medium on which the program of the sixteenth aspect of the present invention is recorded, and can be processed by a computer.

  The present invention can provide an array antenna apparatus, a control method thereof, and the like that can suppress radio waves from adjacent stations and receive radio waves from desired stations satisfactorily even in a situation where the influence of adjacent channel radio waves is large.

  Hereinafter, with reference to the drawings, an example in which the array antenna apparatus according to the embodiment of the present invention is installed in an automobile and applied to an in-vehicle diversity type FM radio receiver that receives an analog FM broadcast will be described. In the following description, for the sake of simplicity, the case where two antennas are connected will be described as an example. However, the theory of array antennas is not limited to this, and two or more antennas are used. You may have. In the drawings, components not related to the present invention are omitted.

(Embodiment 1)
FIG. 1 is a block diagram showing an overall configuration of a radio receiver incorporating an array antenna apparatus according to Embodiment 1 of the present invention. In FIG. 1, the radio receiver includes antennas 1 and 2, front end units (hereinafter referred to as FE) 3 and 4, AD conversion units (hereinafter referred to as ADC) 5 and 6, IQ conversion units 7 and 8, and adaptation. The controller 9 includes a pseudo desired signal adder 11, an array synthesizer 14, an FM demodulator 15, a DA converter (hereinafter referred to as DAC) 16, and a speaker 17. As an example, the adaptive control processing unit 25 of the present invention includes an adaptive control unit 9 and an array combining unit 14. Here, the array antenna apparatus includes at least the antennas 1 and 2, the pseudo desired signal adding unit 11, and the adaptive control processing unit 25.

  The antennas 1 and 2 are antennas that receive radio waves from FM broadcast stations, and are glass antennas incorporated in glass such as pole antennas and windows. For example, the glass antenna is formed by printing a conductive paste.

  The FEs 3 and 4 convert the high-frequency signals received by the antennas 1 and 2 to an intermediate frequency band having a lower frequency, and output the converted signals to the ADCs 5 and 6 at the subsequent stages.

  The ADCs 5 and 6 convert the intermediate frequency band analog signals output from the FEs 3 and 4 into digital signals (hereinafter referred to as IF signals), and output them to the IQ conversion units 7 and 8, respectively.

  IQ conversion units 7 and 8 perform quadrature demodulation and downsampling on the intermediate frequency band digital signals output from ADCs 5 and 6, and output them to pseudo desired signal addition unit 11 and array synthesis unit 14.

  Specific processing of the IQ conversion units 7 and 8 is shown in FIG. When the digital signal in the intermediate frequency band is branched into two, and the SIN signal and the COS signal are respectively multiplied and down-sampled as shown in FIG. 2, complex signals of I signal and Q signal are obtained. Note that Fif in FIG. 2 indicates the center frequency of the IF signal, and Fs indicates the sampling frequency of the IF signal. In addition, pi is a circumference ratio, and n indicates the number of samples (a digital signal, holding data at a time that is an integral multiple of the sampling period 1 / Fs). In this way, the output is two in FIG. 2, but in the subsequent signal processing, the I signal and the Q signal are always used at the same time. Therefore, in the other drawings, one signal (hereinafter referred to as the IQ signal) is used. It is regarded as described.

  The adaptive control unit 9 pays attention to the fact that the FM modulation is constant in amplitude for the IQ signal output from the pseudo desired signal adding unit 11 described later, performs adaptive control based on the constant amplitude reference, and is optimal for the reference The weight vector having the amplitude and phase information is output to the array synthesis unit 14. Here, the constant amplitude reference is an example of the norm of adaptive control according to the present invention.

  Specifically, it is desirable to use CMA (CONSTANT MODULUS ALGORITHM) as a known adaptive algorithm. When calculating the weight vector, the output of the array synthesis unit 14 is also used. Here, the weight vector is a complex vector indicating the amount of change in amplitude and phase when the signals input from the antennas 1 and 2 are corrected. On the other hand, since the IQ signal can also be treated as a complex signal, The phase operation can be expressed in a simple form of multiplication between complex numbers.

  The array combining unit 14 controls the amplitude and phase of each IQ signal output from the IQ converting units 7 and 8 according to the weight vector, and outputs the combined signal.

  Hereinafter, the problems of CMA will be described first, and then this embodiment will be described.

  FIG. 3A shows the frequency characteristics of the IF signal when two waves of the desired wave transmitted from the desired station and the adjacent wave transmitted from the adjacent station are received simultaneously. Here, if the center frequency difference between the desired wave and the adjacent wave is sufficiently larger than each frequency transition width, only the adjacent wave can be removed by a filtering process such as a low-pass filter. However, as shown in FIG. 3A, when the center frequencies of the desired wave and the adjacent wave are close to each other and the respective modulation rates are high, the bands overlap each other. Therefore, only the adjacent wave cannot be removed by the filtering process.

  Therefore, when attention is paid to the fact that the arrival directions of the desired wave and the adjacent wave are different directions as shown in FIG. 4, it has been found that the directivity control function performed by the above-mentioned CMA may be used. This different direction is as shown in FIG. FIG. 4 shows a situation where the antenna 1 and the antenna 2 receive two waves of a desired wave and an adjacent wave (both are plane waves). The antenna 1 receives the desired wave 18 and the adjacent wave 20, and the antenna 2 receives the desired wave 19 and the adjacent wave 21. The desired wave 18 and the desired wave 19 are incident from the direction of the desired wave arrival angle 22 on the basis of a straight line passing through the center and orthogonal to the line segment connecting the two antenna positions. Similarly, the adjacent wave 20 and the adjacent wave 21 enter from the direction of the adjacent wave arrival angle 23.

  By the way, there are the following problems when considering the use of the directivity control function of the CMA for the desired wave and the adjacent wave. The CMA is controlled so as to be optimal on a constant amplitude basis, but when receiving a two-wave signal having a constant amplitude, the CMA has a property of suppressing directivity with a low electric field strength and realizing directivity to receive a high signal. Therefore, when a signal having an electric field strength of an adjacent wave larger than that of the desired wave as shown in FIG. 3A is received and synthesized by CMA as it is, the desired wave is suppressed and only the adjacent wave is received as shown in FIG. Resulting in. Here, the adjacent wave and the adjacent signal are examples of the disturbing wave and the disturbing signal of the present invention.

  Therefore, in the first embodiment, in order to avoid such a phenomenon, as described above, predetermined IQ signals output from the IQ conversion units 7 and 8 by the pseudo desired signal addition unit 11 are predetermined. After performing the addition process, the data is input to the adaptive control unit 9.

  The assumption that the direction of arrival of the desired wave and the adjacent wave is different is based on a probability distribution in which both the desired wave and the adjacent wave are fading and have amplitude and phase when the vehicle is traveling (for example, out of line of sight). Since the amplitude can be modeled with a Rayleigh distribution and the phase can be modeled with a uniform distribution), it is rare that they arrive completely in the same direction.

  The pseudo desired signal adding unit 11 generates a pseudo desired signal 31 having a sufficiently high electric field strength with respect to the desired wave 30 of the IQ signal output from the IQ converting units 7 and 8, as shown in FIG. Then, it is added to the IQ signal and output to the adaptive control unit 9. Since the pseudo-desired signal 31 only needs to satisfy the CMA constant amplitude standard, there is no restriction on the modulation signal. For example, an IQ signal whose modulation content is a sine wave may be used. At that time, the output signal of the pseudo desired signal adding unit 11 is as shown in FIG. 5A, and the two signals of the pseudo desired signal 31 and the adjacent wave 32 become significant signals.

  As a result, in the adaptive control unit 9, when the CMA receives a two-wave signal having a constant amplitude, the CMA has the property of suppressing the signal with low electric field strength and realizing directivity to receive a high signal. Operates to suppress. On the other hand, the input of the array synthesizing unit 14 is the output of the IQ converting units 7 and 8 and is not affected by the pseudo desired signal 31, so that the desired wave can be received as shown in FIG.

  That is, the array synthesizing unit 14 controls the amplitude and phase of each IQ signal from the IQ conversion units 7 and 8 that are two antenna inputs based on the weight vector output from the adaptive control unit 9 into one signal. Combined and output to the adaptive control unit 9 and the FM demodulation unit 15. In this way, the desired wave is extracted.

  The FM demodulator 15 demodulates the IQ signal input from the array synthesizer 14 into a composite signal, then demodulates the composite signal into an audio signal, and outputs it to the DAC 16.

  The DAC 16 converts the digital audio signal from the FM demodulator 15 into an analog audio signal and outputs it to the speaker 17.

  The speaker 17 reproduces sound from the analog signal input from the DAC 16.

  Next, the operation of the entire receiver will be described with reference to the flowchart of FIG. First, radio wave information received by the two antennas 1 and 2 at FE3 and 4 is converted into an intermediate frequency band (step S701), and then converted to a digital signal by ADCs 5 and 6 (step S702). Next, the digital signals converted by the IQ conversion units 7 and 8 are complexed (step S703). Next, the pseudo desired signal adding unit 11 adds the pseudo desired signal having a sufficiently high electric field strength and outputs the output to the adaptive control unit 9 (step S707).

  The adaptive control unit 9 performs adaptive control based on a constant amplitude reference, and outputs a weight vector having amplitude and phase information that is optimal with respect to the reference to the array combining unit 14 (step S709).

  The array combining unit 14 combines antenna inputs based on the weight vector output from the adaptive control unit 9 and outputs the combined antenna input to the FM demodulation unit 15 (step S710). The FM demodulator 15 demodulates the IQ signal input from the array synthesizer 14 into a composite signal, and then demodulates the composite signal into an audio signal and outputs it to the DAC 16 (step S711). The DAC 16 converts the digital audio signal from the FM demodulator 15 into an analog audio signal and outputs it to the speaker 17 (step S712). The speaker 17 reproduces audio from the analog signal input from the DAC 16 (step S713). The entire process is completed.

  By such processing, even in a situation where a signal having an electric field strength of an adjacent wave larger than that of the desired wave is received, it is possible to avoid suppressing the desired wave and receiving only the adjacent wave. When viewed as a whole, it is possible to maintain a good reception state of a desired wave without being affected by the interference of adjacent channel radio waves.

(Embodiment 2)
Next, a second embodiment of the present invention will be described.

  In the configuration of the first embodiment shown in FIG. 1, the desired wave, the pseudo-desired signal, and the adjacent wave, as shown in FIG. However, from the viewpoint of the CMA algorithm, since it seems that three waves are received, it may be difficult to handle. This is because the CMA algorithm can suppress only one wave in principle because there are two antennas. Also, in the situation where the electric field strength varies due to fading and the vertical relationship of the electric field strength changes, the superiority of the electric field strength in the received signal is switched, and the directivity changes each time and the reception state deteriorates. Tend to cause. Therefore, as will be described below, the desired wave is intentionally reduced before the pseudo desired signal is added. FIG. 7 shows a configuration for solving the problem. The description of the same parts as those in FIG. 1 is omitted.

  That is, the configuration of the second embodiment includes an interference signal extraction unit 10 in addition to the configuration of FIG.

  The IQ conversion units 7 and 8 output IQ signals to the interference signal extraction unit 10 and the array synthesis unit 14. The interference signal extraction unit 10 outputs the output signal to the pseudo desired signal addition unit 11.

  Here, the interference signal extraction unit 10 extracts the IQ signals output from the IQ conversion units 7 and 8 using the bandpass filter 33 for the adjacent wave, and outputs the extracted signals to the pseudo desired signal addition unit 11. . The center frequency of the adjacent wave of the adjacent station is determined to be 200 kHz away from the center frequency of the broadcast wave of the desired station that the user has tuned as desired. do it. In the second embodiment, the bandpass filter is used. However, since it is only necessary to extract an adjacent wave, processing in another time domain such as a highpass filter may be used.

  At this time, since the phase information is important information related to the direction of the incoming wave for the CMA, a filter having a linear phase characteristic in which the phase information is held is desirable. The output signal at that time is as shown in FIG.

  Next, the signal output from the interference signal extraction unit 10 generates and adds a pseudo desired signal 31 having a sufficiently high electric field strength in the pseudo desired signal addition unit 11. The result is shown in FIG. In this case, since the desired wave is suppressed in advance by the interference signal extracting unit 10, the output signal of the pseudo desired signal adding unit 11 is substantially a signal including only the pseudo desired signal and two adjacent waves. As a result, an adjacent wave and a pseudo-desired signal having a larger electric field strength are input to the adaptive control unit 9, and when the CMA receives a two-wave signal, the signal having a lower electric field strength is suppressed and a higher signal is received. Adjacent waves are suppressed due to the property of realizing the directivity.

  On the other hand, since the signals from the IQ conversion units 7 and 8 are directly input to the input of the array synthesis unit 14 and are not affected by the pseudo desired signal, the desired wave can be received as shown in FIG. 9B. .

  Next, the operation of the entire receiver will be described using the flowchart of FIG. A description of the same parts as those in the first embodiment will be omitted. That is, the interference signal extraction unit 10 extracts an adjacent wave from the IQ signal complexed by the IQ conversion units 7 and 8 (step S703) and outputs the adjacent wave to the pseudo desired signal addition unit 11 (step S706). The pseudo desired signal adding unit 11 adds the pseudo desired signal (step S707).

  By such processing, in addition to the effect of the first embodiment of FIG. 1, even in a situation where the electric field strengths of the desired wave and the adjacent wave are comparable, by adding the pseudo desired signal after suppressing the desired wave. Since the input signal to the adaptive control unit 9 can be maintained as an adjacent wave and a pseudo-desired signal having a larger electric field strength, the adjacent wave can be suppressed and a good reception state can be maintained.

(Embodiment 3)
Next, a third embodiment of the present invention will be described.

  In the first embodiment shown in FIG. 1, in the situation where the electric field strength of the desired wave is considerably larger than the adjacent wave, the output of the pseudo desired signal adding unit 11 is a signal in which the pseudo desired signal and the desired wave are significant. . Therefore, in the adaptive control unit 9, when the above-mentioned CMA receives a two-wave signal, it operates to suppress the desired wave from the property of suppressing the signal with low electric field strength and realizing the directivity to receive the high signal. However, the desired wave is suppressed at the output of the array synthesizing unit 14 and becomes a signal for receiving the adjacent wave, which may deteriorate the reception state. FIG. 11 shows a configuration that solves this problem. The description of the same parts as those in FIG. 1 is omitted.

  In addition to the configuration of the first embodiment shown in FIG.

  The IQ conversion units 7 and 8 output to the adjacent channel interference detection unit 12 in addition to the pseudo desired signal addition unit 11 and the array synthesis unit 14. The adjacent channel interference detection unit 12 estimates the electric field strength of the adjacent wave and outputs it to the pseudo desired signal addition unit 11.

  The pseudo-desired signal adding unit 11 generates a pseudo-desired signal having a sufficiently high electric field strength when the adjacent channel disturbance detecting unit 12 detects an adjacent wave with respect to the IQ signals output from the IQ converting units 7 and 8. In the case where no addition is detected, the input signal is output to the adaptive control unit 9 without being added. As a result, in a situation where the electric field strength of the desired wave is considerably larger than the adjacent wave, the signal as it is is input to the adaptive control unit 9, and when the above-mentioned CMA receives a two-wave signal, the signal having a low electric field strength is suppressed. Adjacent waves are suppressed due to the property of realizing directivity for receiving high signals. The input of the array synthesis unit 14 is the IQ conversion units 7 and 8 and is not affected by the pseudo-desired signal, so that the desired wave can be received.

  As described above, the adjacent channel radio wave interference detection unit 12 detects whether the adjacent channel radio wave interference has occurred from the IQ signals output from the IQ conversion units 7 and 8, and uses the information as the pseudo desired signal addition unit 11. Output to. As a specific method of detection, since the adjacent channel radio wave interference exists at a frequency 200 kHz higher than the desired wave center frequency as described above, a signal in the vicinity of the adjacent wave center frequency is extracted with a high-pass filter, and the electric field strength and By comparing with the set threshold value, it is possible to determine the presence or absence of interference of adjacent channel radio waves.

  In addition to the high-pass filter, it is only necessary to detect the presence / absence of a signal separated from the center frequency of the desired wave on the frequency axis, so processing in other time domains such as a band-pass filter or processing in other domains such as a frequency domain may be performed. Good. At this time, it is desirable that the process holds the phase information.

  Next, the operation of the entire receiver will be described using the flowchart of FIG. A description of the same parts as those in the first embodiment will be omitted. That is, the adjacent channel interference detector 12 detects the presence or absence of adjacent channel radio wave interference from the IQ signals complexed by the IQ converters 7 and 8 (step S703) (step S704). If it is detected that there is an interference with the adjacent channel radio wave in the received signal, the pseudo desired signal adding unit 11 adds the pseudo desired signal having a sufficiently high electric field strength and outputs the output to the adaptive control unit 9 (step S707). ). When it is not detected, nothing is done and it is output to the adaptive control unit 9 as it is.

  By such processing, in addition to the effect of the first embodiment of FIG. 1, even in a situation where the electric field strength of the desired wave is considerably larger than the adjacent wave, the adaptive control unit 9 stops the addition processing of the pseudo desired signal. Therefore, it is possible to suppress adjacent signals and maintain a good reception state.

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described.

  In the first embodiment shown in FIG. 1, when the adjacent wave has a stronger electric field strength than the desired wave, and the pseudo desired signal has a much larger electric field strength than the adjacent wave, the pseudo desired signal adding unit The output of 11 is a significant signal only for the pseudo-desired signal. That is, for the CMA algorithm, there is only one wave, and therefore directivity is directed to the pseudo-desired signal, and the adjacent wave cannot be suppressed. Therefore, the desired wave and the adjacent wave are output at the output of the array synthesis unit 14. Therefore, the reception state is not improved.

  That is, the electric field strength of the pseudo desired signal needs to be sufficiently larger than that of the adjacent station, but if it is too large, the adjacent wave cannot be suppressed. FIG. 13 shows the configuration of the fourth embodiment that solves this problem. The description of the same parts as those in FIG. 1 is omitted.

  In addition to the configuration of the first embodiment shown in FIG.

  The IQ conversion units 7 and 8 output to the adjacent wave electric field intensity estimation unit 13 in addition to the pseudo desired signal addition unit 11 and the array synthesis unit 14.

  The pseudo desired signal adding unit 11 adds a pseudo desired signal having a magnitude corresponding to the electric field strength of the adjacent wave estimated by the adjacent wave electric field strength estimating unit 13 to the IQ signal output from the IQ converting units 7 and 8. To do. That is, the electric field strength of the pseudo desired signal at this time becomes larger than the electric field strength of the adjacent wave to such an extent that the CMA operates to suppress the adjacent wave. Note that the inputs of the array synthesis unit 14 are IQ conversion units 7 and 8 and are not affected by the pseudo-desired signal, so that the desired wave can be received.

  The adjacent wave electric field strength estimation unit 13 performs FFT (Fast Fourier Transform) on the IQ signals output from the IQ conversion units 7 and 8 to estimate the electric field strength of the adjacent station.

  Next, the operation of the entire receiver will be described using the flowchart of FIG. A description of the same parts as those in the first embodiment will be omitted. That is, the adjacent wave electric field strength estimating unit 13 estimates the electric field strength of the adjacent wave from the IQ signal complexed by the IQ converting units 7 and 8 (step S703) (step S705). Next, the electric field strength is greater than the adjacent wave electric field strength estimated by the adjacent wave electric field strength estimating unit 13 so that the adaptive control unit 9 suppresses the adjacent wave of the adjacent station. A pseudo desired signal is generated and added (step S707).

  By such processing, in addition to the effect of the first embodiment of FIG. 1, the adjacent wave has a stronger electric field strength than the desired wave, and the pseudo desired signal has a much larger electric field strength than the adjacent wave. By adding the pseudo-desired signal having an appropriate electric field strength, the adaptive control unit 9 can suppress the adjacent wave, so that a good reception state can be maintained.

(Embodiment 5)
Next, a fifth embodiment of the present invention will be described.

  A fifth embodiment having the characteristics of the first, second, third, and fourth embodiments described above is shown in FIG.

  In addition to the configuration of the first embodiment in FIG. 1, the apparatus has an interference signal extraction unit 10, an adjacent channel interference detection unit 12, and an adjacent wave electric field intensity estimation unit 13.

  The IQ conversion units 7 and 8 output the interference signal extraction unit 10, the adjacent channel interference detection unit 12, the adjacent wave electric field strength estimation unit 13, and the array synthesis unit 14.

  The adjacent channel interference detection unit 12 detects whether the adjacent channel radio wave is disturbed from the input IQ signal, and outputs the result to the interference signal extraction unit 10 and the pseudo desired signal addition unit 11. The adjacent wave electric field strength estimating unit 13 estimates the electric field strength of the adjacent wave from the input IQ signal, and outputs it to the pseudo desired signal adding unit 11. The interference signal extraction unit 10 changes the process according to the result of the adjacent channel interference detection unit 12 and outputs it to the pseudo desired signal addition unit 11. The pseudo desired signal adding unit 11 changes the process according to the result of the adjacent channel interference detecting unit 12 and outputs the result to the adaptive control unit 9.

  Each component is the same as that described with reference to FIGS. 7, 11, and 13. The adjacent channel interference detection unit 12 detects the presence / absence of interference of the adjacent channel radio wave, and when detected, the adjacent signal is extracted by the interference signal extraction unit 10, and further the adjacent wave electric field is detected by the pseudo desired signal addition unit 11. A pseudo desired signal larger than the electric field strength of the adjacent wave estimated by the strength estimating unit 13 is added. At this time, as described above, it is desirable that the process holds the phase information.

  On the other hand, when the adjacent channel interference detection unit 12 does not detect the interference of the adjacent channel radio wave, the interference signal extraction unit 10 and the pseudo desired signal addition unit 11 do nothing and output to the adaptive control unit 9. At this time, it is desirable to output the signal as it is after being delayed by the delay time required for the interference signal extraction process and the pseudo desired signal addition process.

  Next, the operation of the entire receiver will be described using the flowchart of FIG. A description of the same parts as those in the first embodiment will be omitted. That is, the adjacent channel interference detector 12 detects the presence or absence of adjacent channel radio wave interference from the IQ signals complexed by the IQ converters 7 and 8 (step S703) (step S704). If it is detected that there is an interference of adjacent channel radio waves in the received signal, the adjacent wave electric field intensity estimation unit 13 estimates the electric field strength of the adjacent wave (step S705), and the interference signal extraction unit 10 detects the adjacent wave. In step S706, the pseudo-desired signal adding unit 11 adds a pseudo-desired signal having an electric field strength larger than the estimated adjacent-wave electric field strength to the extent that the adaptive control unit 9 suppresses the adjacent station ( Step S707).

  On the other hand, when the interference of the adjacent channel radio wave is not detected, the interference signal extraction unit 10 and the pseudo desired signal addition unit 11 do nothing and output the signal to the adaptive control unit 9 as it is.

  By switching the processing in this way, a configuration having the features of the embodiments described in the second, third, and fourth embodiments in addition to the effect of the first embodiment in FIG. 1 is possible. That is, it is possible to maintain a good reception state in various radio wave arrival situations.

  In addition, by simply devising software for the in-vehicle FM receiver, it is possible to operate the method including the synthesis processing under various reception radio wave environments normally and stably at a relatively low cost compared to the method of changing the hardware. it can.

(Embodiment 6)
Next, a sixth embodiment of the present invention will be described.

  In the configuration of the first embodiment shown in FIG. 1, the adjacent wave may not be suppressed by the adaptive control processing of CMA depending on the electric field strength, the arrival direction, the modulation content, the center frequency difference, etc. of the pseudo desired signal and the adjacent wave. . For example, when the input to the pseudo-desired signal adding unit 11 is in a state close to a constant amplitude condition, the adjacent wave cannot be suppressed because nothing is done and the CMA standard is satisfied. In other words, it is no different from the state of receiving with one antenna and demodulating it as it is. Embodiment 6 which solved this problem is shown in FIG.

  In addition to the configuration of the first embodiment shown in FIG. 1, a signal transformation unit 24, an adaptive control unit 41, an array synthesis unit 27, a received radio wave condition analysis unit 40, and a signal selection unit 28 are further provided. The IQ signals output from the IQ conversion units 7 and 8 are also input to the signal transformation unit 24 and the received radio wave condition analysis unit 40 in addition to the array synthesis unit 14 and the pseudo desired signal addition unit 11. An output signal from the signal transformation unit 24 is input to the adaptive control unit 41 and the array synthesis unit 27. The output from the array synthesis unit 27 is output to the adaptive control unit 41 and the signal selection unit 28. The output from the array synthesizing unit 14 is also input to the signal selecting unit 28. Further, the output of the signal selector 28 is output to the FM demodulator 15.

  The output signal from the received radio wave state analyzing unit 40 is input to the signal selecting unit 28. The adaptive control unit 41 has the same function as the adaptive control unit 9, and the array combining unit 27 has the same function as the array combining unit 14 except that the input signal is different.

  The first adaptive control processing unit 25 of the present invention is composed of the adaptive control unit 9 and the array combining unit 14, and the second adaptive control processing unit 42 is composed of the adaptive control unit 41 and the array combining unit 27. ing.

  The signal modifying unit 24 transforms the adjacent wave signal of the adjacent station so as to avoid the situation as shown in FIG. 3B and outputs the signal to the adaptive control unit 41 and the array combining unit 27. Specifically, when a signal as shown in FIG. 3A is received, the signal of the adjacent wave of the adjacent station is transformed into a signal that violates the CMA constant amplitude standard.

  That is, since the adjacent wave signal of the adjacent station is an FM signal, the amplitude is constant, but the signal is modified so that the amplitude is intentionally not constant.

  Thus, according to the CMA algorithm, as a main premise, an attempt is made to suppress one of the two waves whose amplitude is not constant, so that the signal of the adjacent wave of the adjacent station after the modification is suppressed. It is known that the adjacent wave signal of the adjacent station is a radio wave having a center frequency of 0.1 MHz (domestic) higher than the center frequency of the broadcast wave of the desired station by the user. It is only necessary to focus on the center frequency of the adjacent wave for deformation.

  As a method of adding deformation, deformation was performed using a notch filter. As a result, the output signal of the signal transformation unit 24 is as shown in FIG. 18A. For the CMA, the desired wave is received by suppressing the adjacent wave, rather than the adjacent wave received by suppressing the desired wave. Therefore, it is possible to suppress the adjacent wave and receive the desired wave as shown in FIG. 18B.

  In addition, since the method for transforming may be a process in which the signal of the adjacent station deviates from the constant amplitude reference, not only the notch filter but also a process in the time domain such as a low-pass filter, a band stop filter, and a comb filter. But you can. At this time, since the phase information is important information related to the direction of the incoming wave for the CMA, a filter having a linear phase characteristic in which the phase information is held is desirable. For the same reason, processing in a frequency domain other than the time domain may be performed as long as the signal of the adjacent station deviates from the constant amplitude reference. Also at this time, it is desirable that the process holds the phase information.

  The array synthesizing unit 27 synthesizes one signal by controlling the amplitude and phase of each IQ signal from the signal transformation unit 24 based on the weight vector output from the adaptive control unit 41. The data is output to the selection unit 28.

  The received radio wave condition analysis unit 40 measures how far the amplitude is deviated from the constant amplitude reference. As a specific method, for example, it can be measured by calculating the amplitude (electric field strength) of the IQ signal and extracting it with a high-pass filter. When close to the constant amplitude reference, the measured value is small, and when outside the constant amplitude reference, the measured value is large. The output signal from the reception radio wave condition analysis unit 40 is input to the signal selection unit 28.

  The signal selection unit 28 selects and outputs the optimum one of the outputs from the array synthesis unit 14 and the array synthesis unit 27 from the output signal from the received radio wave condition analysis unit 40. Specifically, when the amplitude greatly deviates from the constant amplitude reference and is larger than a preset threshold value, that is, when the output from the received radio wave condition analysis unit 40 is large, the array synthesis unit 14 which is a pseudo desired signal addition method is used. When an output is selected and the amplitude is close to a constant reference, that is, when the output from the received radio wave condition analysis unit 40 is smaller than the above-described threshold, the output of the array synthesis unit 27 which is a signal transformation method is selected.

  Next, the operation of the entire receiver will be described using the flowchart of FIG. A description of the same parts as those in the first embodiment will be omitted. That is, from the IQ signal complexed by the IQ conversion units 7 and 8 (step S703), the degree to which the received radio wave condition analysis unit 40 deviates from the constant amplitude reference is measured (step S714).

  The signal selection unit 28 switches processing based on the measurement value. That is, when the measured value is large, the pseudo signal addition method is selected, and the pseudo desired signal adding unit 11 adds the pseudo desired signal having a sufficiently high electric field strength (steps S715 and S707). The array synthesis unit 14 performs adaptive control (steps S709 and S710). On the other hand, when the measured value is small, the signal modification method is selected, and the signal modification unit 24 transforms the adjacent wave signal of the adjacent station into a signal that violates the CMA constant amplitude standard (steps S715 and S716). ), Adaptive control is performed by the adaptive control unit 41 and the array combining unit 27 (steps S709 and S710).

  The signal selection unit 28 selects one of the combined outputs.

  The reception radio wave condition analysis unit 40 itself may be configured to select inputs to the array synthesis unit 14, the pseudo desired signal addition unit 11, and the signal transformation unit 24 (from the reception radio wave condition analysis unit 40 above). Control arrow 400 extending to That is, instead of causing the signal selection unit 28 to select a signal as described above, the reception radio wave condition analysis unit 40 determines whether or not the pseudo symbol signal addition unit 11 and the first adaptive control processing unit 25 ( The combination of the adaptive control unit 9 and the array combining unit 14) or the combination of the signal transformation unit 24 and the second adaptive control processing unit 42 (the adaptive control unit 41 and the array combining unit 27) is selected. It is also possible to stop the operation and operate only the remaining set. In this case, the signal selection unit 28 may be omitted.

  As another modification of the sixth embodiment, the received radio wave condition analysis unit 40 may perform another analysis. This will be described below.

  The reception radio wave condition analysis unit 40 measures the influence degree of adjacent interference in a processing unit for numerically calculating CMA processing. As a specific method, for example, it can be measured by calculating with the filter used in the signal transformation unit 24, calculating the amplitude (electric field strength) of the IQ signal, and extracting it with a high-pass filter. When the influence of adjacent interference is small in the processing unit, the measured value is small, and when the influence is large, the measured value is large. The output signal from the reception radio wave condition analysis unit 40 is input to the signal selection unit 28.

  The signal selection unit 28 selects and outputs the optimum one of the outputs from the array synthesis unit 14 and the array synthesis unit 27 from the output signal from the received radio wave condition analysis unit 40. Specifically, when the influence degree of adjacent interference is small and smaller than a preset threshold value, that is, when the output from the received radio wave condition analysis unit 40 is small, the array synthesis unit 14 which is a pseudo desired signal addition method. When the influence of the adjacent interference is large, that is, when the output from the received radio wave condition analyzing unit 40 is larger than the above threshold, the output of the array combining unit 27 which is a signal transformation method is selected.

  Next, the operation of the entire receiver will be described with reference to the flowchart of FIG. A description of the same parts as those in the first embodiment will be omitted. That is, the influence level of the adjacent disturbance is measured in the received radio wave condition analysis unit 40 from the IQ signal complexed in the IQ conversion units 7 and 8 (step S703) (step S714).

  The signal selection unit 28 switches processing based on the measurement value. That is, when the measured value is small (in this modification, the magnitude of step 715 in FIG. 19 is switched), the pseudo signal addition method is selected, and the pseudo desired signal intensity that is sufficiently high in the pseudo desired signal adder 11 is obtained. The signals are added (steps S715 and S707), and the adaptive control unit 9 and the array combining unit 14 perform adaptive control (steps S709 and S710). On the other hand, when the measured value is large, the signal modification method is selected, and the signal modification unit 24 performs predetermined modification processing on the interference signal (steps S715 and S716), and the adaptive control unit 41 and the array synthesis. Adaptive control is performed by the unit 27 (steps S709 and S710).

  Still further, a modification of the first embodiment of the present invention will be described.

  In the first embodiment shown in FIG. 1, the output signals from the IQ conversion units 7 and 8 are directly input as the input signals to the array synthesis unit 14, but as shown in FIG. 20, the pseudo desired signal addition unit 11 The output signal from can be input. Instead, it is necessary to return the FM demodulator 15 by interposing a subtractor 6 for subtracting the added pseudo desired signal.

  The program of the present invention is a program for causing a computer to execute the steps of the array antenna control method of the present invention described above, and is a program that operates in cooperation with the computer.

  The recording medium of the present invention is a recording medium that records a program for causing a computer to execute all or part of the steps of the array antenna control method of the present invention described above, and is readable by the computer. The read program is a recording medium for executing the operation in cooperation with the computer.

  Note that one usage form of the program of the present invention may be an aspect in which the program is recorded on a computer-readable recording medium such as a ROM and operates in cooperation with the computer.

  Also, one use form of the program of the present invention is an aspect in which the program is transmitted through a transmission medium such as the Internet and a transmission medium such as light, radio wave, and sound wave, read by a computer, and operates in cooperation with the computer. Also good.

  The computer of the present invention described above is not limited to pure hardware such as a CPU, and may include firmware, an OS, and peripheral devices.

  Note that the predetermined portion of the present invention may be integrated into a single chip by an integrated circuit. For example, in the first embodiment, an integrated circuit in which an AD conversion unit, a pseudo desired signal addition unit, an adaptive control unit, a demodulation unit, and a DA conversion unit are integrated into one chip. Of course, all of these need not be integrated.

  Also, other embodiments can be appropriately integrated as well.

  Further, as described above, the configuration of the present invention may be realized by software or hardware.

  The array antenna apparatus according to the present invention, its control method, etc. can suppress the interference wave from the adjacent station and receive the radio wave from the desired station satisfactorily even under the influence of the interference of the adjacent channel radio wave. Therefore, it is particularly suitable for an FM broadcast receiver mounted on a mobile body.

1 is a block diagram showing a configuration of a radio receiver according to Embodiment 1 of the present invention. Diagram for explaining IQ conversion In Embodiment 1 of the present invention, (a) a diagram showing the characteristics of a received signal when it is disturbed by adjacent channel radio waves, and (b) the received signal when it is disturbed by adjacent channel radio waves is directly processed by the CMA. Of the output signal The figure which shows an example of the reception state of a desired wave and an adjacent wave in Embodiment 1 of this invention In Embodiment 1 of the present invention, (a) a diagram showing the characteristics of an output signal that has undergone pseudo-desired signal addition processing when adjacent channel radio waves are disturbed, and (b) an array composite output signal when adjacent channel radio waves are disturbed Diagram showing features In Embodiment 1 of this invention, the flowchart for demonstrating operation | movement of the whole receiver. The block diagram which shows the structure of the radio receiver in Embodiment 2 of this invention In Embodiment 2 of the present invention, (a) a diagram showing the characteristics of a received signal at the time of interference of adjacent channel radio waves (b) an output obtained by performing interference signal extraction processing on an input signal that has been interfered by adjacent channel radio waves Diagram showing signal characteristics In Embodiment 2 of the present invention, (a) a diagram showing the characteristics of an output signal obtained by performing pseudo desired signal addition processing after interference signal extraction processing at the time of interference of adjacent channel radio waves (b) array at the time of interference of adjacent channel radio waves Diagram showing characteristics of synthesized output signal In Embodiment 2 of this invention, the flowchart for demonstrating operation | movement of the whole receiver. Block diagram showing a configuration of a radio receiver according to Embodiment 3 of the present invention In Embodiment 3 of this invention, the flowchart for demonstrating operation | movement of the whole receiver. Block diagram showing a configuration of a radio receiver according to Embodiment 4 of the present invention. Flowchart for explaining the operation of the whole receiver in Embodiment 4 of the present invention Block diagram showing the configuration of a radio receiver according to the fifth embodiment of the present invention In Embodiment 5 of this invention, the flowchart for demonstrating operation | movement of the whole receiver. Block diagram showing a configuration of a radio receiver according to the sixth embodiment of the present invention In Embodiment 6 of this invention, (a) The figure which shows the characteristic of the output signal which performed the signal deformation | transformation process with respect to the input signal which received the interference of the adjacent channel electromagnetic wave, (b) Signal deformation at the time of the interference of an adjacent channel electromagnetic wave The figure which shows the characteristic of the array synthetic output signal when processing is done Flowchart for explaining the operation of the entire receiver in Embodiment 6 of the present invention The block diagram which shows the modification of Embodiment 1 of this invention

Explanation of symbols

1 Antenna 1
2 Antenna 2
3, 4 FE
5, 6 ADC
7, 8 IQ conversion unit 9 Adaptive control unit 10 Interference signal extraction unit 11 Pseudo desired signal addition unit 12 Adjacent channel interference detection unit 13 Adjacent wave field strength estimation unit 14 Array synthesis unit 15 FM demodulation unit 16 DAC
17 Speaker 18 Desired wave received at antenna 1 19 Desired wave received at antenna 2 20 Adjacent wave received at antenna 1 21 Adjacent wave received at antenna 2 22 Desired wave arrival angle 23 Adjacent wave arrival angle 24 signal Deformation unit 25 First adaptive control processing unit 27 Array synthesis unit 28 Signal selection unit 30 Desired wave 31 Pseudo desired signal 32 Adjacent wave 33 Bandpass filter 40 Received radio wave condition analysis unit 41 Adaptive control unit 42 Second adaptive control processing unit

Claims (17)

An array antenna apparatus having a plurality of antennas for receiving radio waves, adaptively controlling and outputting each received signal received by the antenna by an adaptive control processing unit that performs CMA processing,
An array antenna apparatus provided with a pseudo desired signal addition unit that is provided in a preceding stage of the adaptive control processing unit and adds a pseudo predetermined signal to a desired wave signal included in the received signal. The adaptive control processing unit is a unit that performs CMA processing, and includes an adaptive control unit that calculates a weight vector that realizes the best reception state, and an array combining unit that combines signals input using the weight vector. Have
The array antenna according to claim 1, wherein the received signal is input to the pseudo desired signal adding unit and the array combining unit, and an output signal from the pseudo desired signal adding unit is input to the adaptive control unit. apparatus.   The array antenna apparatus according to claim 1, further comprising: a jamming signal extraction unit that extracts and outputs a jamming signal included in the reception signal before the pseudo desired signal addition unit.   The apparatus further includes a disturbance detection unit that detects a disturbance signal included in the received signal, and adds a pseudo predetermined signal at the pseudo desired station signal addition unit only when the interference detection unit detects the interference signal. The array antenna apparatus according to claim 1.   An interference wave field strength estimation unit that estimates the field strength of the interference signal included in the received signal is further included, and the pseudo desired signal addition unit is configured to respond to the field strength of the interference wave estimated by the interference wave field strength estimation unit. The array antenna apparatus according to claim 1, wherein pseudo predetermined signals having different electric field strengths are added. A pre-stage of the pseudo desired signal adding unit includes a disturbance signal extracting unit that extracts and outputs a disturbance signal included in the reception signal, and further includes a disturbance detection unit that detects a disturbance signal included in the reception signal, Furthermore, a disturbing wave field strength estimating unit for estimating the field strength of the disturbing signal included in the received signal,
When the interference detection unit detects an interference signal, the interference signal extraction unit extracts the interference signal and outputs the interference signal to the pseudo desired signal addition unit. Add a pseudo predetermined signal having an electric field strength corresponding to the electric field strength of the interference wave estimated by the estimation unit,
The array antenna apparatus according to claim 1, wherein when the interference detection unit does not detect an interference signal, the interference signal extraction unit and the pseudo desired signal addition unit do not operate and output the input signal as it is.   The array antenna apparatus according to claim 1, wherein the radio wave is an FM radio wave. An array having a plurality of antennas for receiving radio waves, and outputting each received signal received by the antenna by performing adaptive control for performing CMA processing by either the first adaptive control processing unit or the second adaptive control unit. An antenna device,
The first stage of the first adaptive control processing unit is provided with a pseudo desired signal adding unit that adds a pseudo predetermined signal to a desired wave signal included in the received signal,
A signal deforming unit that performs a deforming process on the disturbing signal included in the received signal so that the disturbing signal is not constant in amplitude is provided in the previous stage of the second adaptive control processing unit,
A received radio wave condition analysis unit for analyzing the radio wave condition of the received signal;
Based on the analysis result of the received radio wave condition analysis unit, the output from the first adaptive control processing unit in which the pseudo desired signal addition unit is provided in the previous stage and the first in which the signal transformation unit is provided in the previous stage. An array antenna apparatus comprising: a signal selection unit that selects an adaptive processing result of any of the outputs from the two adaptive control processing units and obtains an adaptive control processing signal. The radio wave is FM radio radio wave,
The received radio wave condition analysis unit is an analysis unit that measures how far the received radio wave deviates from the constant amplitude reference,
The signal selection unit selects the result of the adaptive processing of the first adaptive control processing unit when the degree of deviation from the constant amplitude reference is larger, and the degree of deviation from the constant amplitude reference is smaller when the degree of deviation from the constant amplitude reference is smaller. 9. The array antenna apparatus according to claim 8, wherein a result of adaptive processing of the two adaptive control processing units is selected. An array having a plurality of antennas for receiving radio waves, and outputting each received signal received by the antenna by performing adaptive control for performing CMA processing by either the first adaptive control processing unit or the second adaptive control unit. An antenna device,
The first stage of the first adaptive control processing unit is provided with a pseudo desired signal adding unit that adds a pseudo predetermined signal to a desired wave signal included in the received signal,
A signal deforming unit that performs a deforming process on the disturbing signal included in the received signal so that the disturbing signal is not constant in amplitude is provided in the previous stage of the second adaptive control processing unit,
A reception radio wave condition analysis unit for analyzing the radio wave condition of the received signal;
Based on the analysis result, the received radio wave state analyzing unit is configured to set a set of the pseudo desired signal adding unit and the first adaptive control processing unit, a set of the signal deforming unit and the second adaptive control processing unit. An array antenna apparatus that selectively executes any one of the processes. The radio wave is FM radio radio wave,
The reception radio wave condition analysis unit is an analysis unit that measures how far the received radio wave deviates from the constant amplitude reference, and when the degree of deviation from the constant amplitude reference is larger, the pseudo desired signal addition If the degree of deviation from the constant amplitude reference is smaller, the processing of the set of the signal transformation unit and the second adaptive control processing unit is executed. The array antenna device according to claim 10.   The array antenna apparatus according to claim 1, wherein the interference signal included in the received signal is a broadcast wave from an adjacent station based on a broadcast wave of a desired station. An array antenna control method comprising a plurality of antennas for receiving radio waves, and combining received signals received by the antennas by adaptive control processing,
In the previous stage of the adaptive control process,
Adding a pseudo predetermined signal to a desired wave signal included in the received signal,
Array antenna control method. A radio receiver incorporating the array antenna device according to claim 1,
A plurality of frequency converters for frequency-converting outputs from the plurality of antennas, respectively;
A plurality of AD converters for AD converting each output from the frequency converter;
A demodulator that demodulates the signal;
A DA converter for DA converting the demodulated signal;
A speaker for inputting the output from the DA converter,
The pseudo desired signal adding unit adds a pseudo predetermined signal to a signal of a desired wave included in a reception signal output from the AD conversion unit,
The adaptive control unit is a radio receiver that performs adaptive control using an output signal from the pseudo desired signal addition unit and outputs the adaptive control unit to the demodulation unit. An integrated circuit used in the radio receiver according to claim 14, comprising:
An integrated circuit in which the AD converter, the pseudo desired signal adder, the adaptive control unit, the demodulator, and the DA converter are integrated into one chip.   14. A program for causing a computer to execute a step of adding a pseudo predetermined signal to a desired wave signal included in the received signal in the preceding stage of the adaptive control process of the array antenna control method according to claim 13. . A recording medium on which the program according to claim 16 is recorded, wherein the recording medium can be processed by a computer.

Images