JP2001358662A - Method and apparatus for self-diagnosis with receiving function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in the connectional method and apparatus that reliability of detected reception level. SOLUTION: When a self-diagnosis function is executed, modulation band of its own transmitting signal is spread wider than a normal band, so that a part of transmission power enters a receiving band, thus detecting the receiving level of a signal source transmitting its own transmission signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-diagnosis device having a reception function suitable for being mounted on a wireless communication device and a method thereof.

[0002]

2. Description of the Related Art In the field of wireless communication, it is required that the operation status of a wireless communication device can be easily grasped even after its operation is started. In general, the operating state of a circuit on the transmitting side can be confirmed from the output state of a transmitted wave as to whether or not it is normal by providing a monitor circuit after an amplifier located at the last stage of the circuit on the transmitting side.

[0003]

However, in the case of the circuit on the receiving side, there is no signal source suitable for diagnosing the operation state like the circuit on the transmitting side. Conventionally, the detection result of the reception level is used for diagnosing the circuit on the reception side. In addition to the fact that the reception level of the reception signal passing through the radio propagation path greatly changes due to environmental conditions, the amount of change also varies for each device. Due to large variations, high-precision diagnosis could not always be guaranteed.

Normally, a reception level is adjusted by inspection using a signal generator or the like at the time of product shipment, and a method of correcting the temperature fluctuation after operation by a thermistor or the like is adopted. However, there is a certain limit in the reliability of the reception level itself, since it differs depending on each device.

[0005]

(A) To solve this problem, the present applicant proposes the following as first means. That is, the present invention proposes a method in which, when the self-diagnosis function is executed, the modulation band of the transmission signal transmitted by the terminal itself is extended beyond the normal band so that a part of the transmission power falls within the reception band.

For example, when the arrangement of the transmission band and the reception band at the time of normal communication is in a positional relationship as shown in FIG. 1A, transmission is performed as shown in FIGS. 1B and 1C. A part of the band overlaps with the reception band. This allows
It is possible to detect a reception level using its own transmission signal as a signal source. In addition, since its own transmission signal can be monitored at a stage prior to the antenna, the influence of a change in environmental conditions, a variation in a fluctuation amount unique to the device, and the like can be reduced, and the accuracy of the reception level can be improved.

(B) The present applicant proposes the following as the second means. In the aforementioned first means,
A method is proposed in which a transmission signal to be transmitted when the self-diagnosis function is performed is supplied to a receiving unit via a wired path formed therein.

As described above, by supplying a transmission signal to the receiving unit via the internal wired path, the characteristics of the propagation path can be stabilized, and the reliability of the reception level detected by the receiving unit can be improved. Can be improved.

(C) The present applicant proposes the following as the third means. In the aforementioned first means,
The present invention proposes a method of supplying a transmission signal to be transmitted when the self-diagnosis function is performed by allowing a part of a signal radiated from a transmission antenna to be input to a reception antenna as a leak signal.

As described above, by supplying its own transmission signal to the receiver as a leak signal, a dedicated communication path for executing a self-diagnosis of the reception function can be made unnecessary inside the device, and the circuit scale can be reduced. Can be downsized.

(D) The present applicant proposes the following as a fourth means. In the above-described first to third means, the correction amount of the reception signal level is determined based on a difference value between the reception signal level at the time of executing the self-diagnosis function and the converted reception signal level of the transmission signal transmitted by the self-diagnosis function. Suggest a way to do it.

As described above, the converted reception signal level of the transmission signal transmitted by itself (the reception signal level originally expected from the propagation path of the transmission signal assumed by itself) and the reception signal level actually detected are By correcting the received signal level based on the difference value of, the reliability of the received level can be further improved.

(E) The present applicant proposes the following as a fifth means. In the aforementioned fourth means,
Calculation of the difference between the received signal level at the time of executing the self-diagnosis function and the converted received signal level of the transmitted signal transmitted by the self-diagnostic function is performed a plurality of times for different transmitted signal levels, and based on the calculation results of the plurality of times. A method for determining the correction value is proposed.

As described above, by determining the correction amount based on the results of the calculations performed a plurality of times, it is possible to guarantee the characteristic fluctuation of the reception level over a wide range with high accuracy.

(F) Further, the present applicant proposes the following as the sixth means. That is, it is a device for self-diagnosing the receiving function of a communication device including a transmitting unit and a receiving unit, and supplies a transmission signal of a normal band whose band is limited to the transmitting unit during communication, and transmits power when performing the self-diagnostic function. The present invention proposes a reception function self-diagnosis device including transmission signal switching means for supplying a transmission signal whose band has been extended to a transmission unit until a part of the transmission function enters a reception band.

For example, as shown in FIG. 2, a normal band transmission signal (passed through the filter 400) is output in a normal band, and a transmission signal with an expanded band is output in a self-diagnosis function. It is proposed that the switch 401 be provided upstream of the transmission unit 200. By employing such a configuration, it is possible to detect a reception level using its own transmission signal as a signal source.

Since its own transmission signal can be monitored in front of the antenna, the influence of changes in environmental conditions and variations in the amount of fluctuation inherent to the device can be reduced, and the accuracy of the reception level can be improved.

By the way, as a propagation path for supplying a transmission signal at the time of executing the self-diagnosis function to its own receiving unit, the transmission path may be turned back via a wired path provided before the antenna means 300 or may be provided at a subsequent stage of the antenna means 300. It does not matter whether the return is made using the leak radio path.

(G) The present applicant proposes the following as a seventh means. In the aforementioned sixth means,
The present invention proposes a device having a wired path for supplying a transmission signal to the receiving unit when executing the self-diagnosis function. As described above, by supplying the transmission signal to the reception unit via the internal wired path, the characteristics of the propagation path can be stabilized, and the reliability of the reception level detected by the reception unit can be improved.

(H) The present applicant proposes the following as the eighth means. In the aforementioned seventh means,
At the time of communication, a transmission signal is supplied to a transmission antenna, and at the time of execution of a self-diagnosis function, first switching means for supplying the transmission signal to the wired path, and at the time of communication, a reception signal from a reception antenna is supplied to a reception unit; It is proposed to provide a second switching unit for supplying a transmission signal from the above-mentioned wired path to the receiving unit when the self-diagnosis function is executed.

In the case of this configuration, the transmission signal during communication is supplied to the transmission antenna via the first switching means, and the reception signal received by the reception antenna during communication is transmitted to the second antenna.
Is supplied to the receiving unit via the switching means. On the other hand, the transmission signal at the time of executing the self-diagnosis function is supplied to the receiving unit through the first switching unit, the wired path, and the second switching unit in this order.
In addition, since the path is switched using the first and second switching units, it is possible to eliminate the possibility that the transmission signal during the execution of the self-diagnosis function is radiated from both the transmission antenna and the reception antenna as unnecessary radiation. .

(I) The present applicant proposes the following as ninth means. In the aforementioned seventh means,
A filter for supplying only a signal component in a normal band of the transmission signal output from the transmission unit to the transmission antenna; A switching device for supplying a transmission signal from a line to a receiving unit is proposed.

In this configuration, the transmission signal in the normal band at the time of communication is supplied to the transmission antenna via the filter means as it is, and the reception signal received at the reception antenna at the time of communication is supplied to the reception unit via the switching means. Is done. On the other hand, the transmission signal during the execution of the self-diagnosis function is
The signal is supplied to the receiving unit through the switching means in order. It should be noted that a filter means for passing only the transmission signal in the normal band is disposed between the transmission antenna and the transmission unit. This eliminates the possibility that signal components other than the normal band in the transmission signal are radiated from the transmission antenna. it can.

(J) The present applicant proposes the following as the tenth means. In the above-mentioned seventh means, the switch for closing to supply the transmission signal to the transmission antenna during communication, and for performing the self-diagnosis function, opening the switch to inhibit supply of the transmission signal to the transmission antenna, A directional coupler that supplies a reception signal from a reception antenna to a reception unit and supplies a transmission signal from the wired path to the reception unit when the self-diagnosis function is performed, but blocks propagation in the direction of the reception antenna. Suggest something.

In this configuration, a transmission signal during communication is supplied to a transmission antenna via a switch, and a reception signal received by the reception antenna during communication is supplied to a reception unit via a directional coupler. Incidentally, the transmission signal can also be input to the reception unit via the directional coupler, but since the communication band of the transmission signal during communication is different from the reception band of the reception unit, there is no influence on reception. On the other hand, the transmission signal at the time of executing the self-diagnosis function is supplied to the receiving unit via the wired path and the directional coupler in order. Since the directional coupler allows signal propagation only in the coupling direction, no transmission signal is emitted from the receiving antenna when the self-diagnosis function is executed.

(K) The present applicant proposes the following as the eleventh means. In the case where the above-mentioned seventh means uses a shared antenna for transmission and reception,
Between the transmission / reception shared antenna and the transmission unit and the reception unit, at the time of communication, the closing operation is performed to allow the transmission of a transmission signal or a reception signal. And a switch for inhibiting supply of a signal, and at the time of communication, a reception signal input from the switch is supplied to the reception unit, and a transmission signal from the transmission unit is supplied to the transmission / reception shared antenna via the switch, and the self-diagnosis function is executed. At this time, a circulator that supplies a transmission signal from the transmission unit reflected by the switch to the reception unit is proposed.

In this configuration, a transmission signal during communication is supplied to a transmission / reception antenna via a circulator and a switch, and a reception signal received by the transmission / reception antenna during communication is supplied to a reception unit via a switch and a circulator. Is done. On the other hand, the transmission signal during the execution of the self-diagnosis function is supplied to the switch in the open state via the circulator, is totally reflected, and is supplied again to the reception unit via the circulator. Note that, due to the presence of the switch, the transmission signal during the execution of the self-diagnosis function is not supplied to the transmission / reception shared antenna, so that no unnecessary radiation occurs.

(L) The present applicant proposes the following as twelfth means. In any one of the above-described sixth to eleventh means, when the self-diagnosis function is performed, the reception level detection signal is detected based on a difference value between the reception signal level and the converted reception signal level of the transmission signal transmitted by itself at that time. It is proposed that the apparatus further includes a received signal level correcting means for determining a correction amount.

As described above, the converted reception signal level of the transmission signal transmitted by itself (the reception signal level originally expected from the propagation path of the transmission signal assumed by the user) and the actually detected reception signal level By correcting the received signal level based on the difference value of, the reliability of the received level can be further improved.

(M) As a thirteenth means, the applicant of the present invention provides the reception signal level correcting means in the twelfth means, wherein the reception signal level at the time of executing the self-diagnosis function and the transmission signal transmitted by itself at that time The calculation of the difference value with respect to the converted reception signal level is performed a plurality of times for different transmission signal levels, and the correction value is determined based on the calculation results of the plurality of times.

As described above, by determining the correction amount based on the calculation results of a plurality of times, it is possible to guarantee the characteristic fluctuation of the reception level over a wide range with high accuracy.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (A) First Embodiment (A-1) Configuration of Wireless Communication Device with Self-Diagnosis Function FIG. 3 shows a first embodiment of a wireless communication device. FIG.
The communication function related to the present invention is expressed as a functional block. Therefore, it does not limit the circuit arrangement and the like on the actual circuit. FIG. 3 shows a wireless communication apparatus configured to input the output of the local oscillator 2 to the transmission unit 21 via the distributor 1, but the transmission unit 21 may be of a direct modulation type. Further, the wireless communication apparatus in FIG. 3 illustrates a case where demodulation of a received signal is realized by one frequency conversion, but the present invention can also be applied to a system that requires two frequency conversions. These are the same in each embodiment described later.

First, the configuration of the receiving system will be described. The receiving system of the wireless communication device includes a receiving antenna 32, a switch 5
2, a receiving unit 11, and a demodulating unit 12 are sequentially arranged.

The switch 52 is connected to the receiving antenna 3 during communication.
2 is a switching means for connecting the switch 51 to the receiver 11 when the receiver 2 is connected to the receiver 11 and the reception function self-diagnosis is performed.
The signal path between the switch 52 and a switch 51 described later is a dedicated path (wired path) formed so that the reception function can be diagnosed by itself.

The receiving section 11 has a function of selectively giving only the received signal of the reception band to the demodulation section 12 and a function of outputting the reception level of the reception signal of the reception band as a reception level detection signal. This reception level detection signal is used for determining whether the reception system (including the reception unit 11) is operating normally, determining the reception status, controlling the transmission power of the other party, and other controls. The demodulation unit 12 is means for demodulating a received signal by a predetermined demodulation method according to a modulation method (AM, PM, FM, ASK, PSK, FSK or another method) specified in a communication method.

Next, the configuration of the transmission system will be described. The transmission system of the wireless communication device includes a switch 41 for inputting modulated data (communication data) that has passed through the low-pass filter 40 and test data for receiving function self-diagnosis;
The transmission unit 21, the switch 51, and the transmission antenna 31 are sequentially arranged.

The modulator 22 modulates a transmission signal input from the switch 41 by a modulation method specified in a communication method. Here, the switch 41 supplies the modulation data from the low-pass filter 40 to the modulation unit 22 in a normal state (at the time of communication), and supplies the test data to the modulation unit 22 during the self-diagnosis of the reception function.

Here, the configuration in which the band is limited by passing the modulated data in the normal state (at the time of communication) through the low-pass filter 40 is adopted. When the modulated signal is a digital signal, the frequency band is modulated by the modulation. Is infinitely spread. Hereinafter, the case where the modulation signal is a digital signal will be described, but the modulation signal may be an analog signal. In that case, whether or not to use a low-pass filter depends on the applied system.

On the other hand, the band of the test data is extended over a wide range by the modulation operation in the modulation section 22 because the band is not limited. Although it is technically possible to input the test data to the switch 41 via a filter having a predetermined pass band, as shown in FIG. 3, it is easy to extend the signal band. It is preferable to input directly. The same applies to the following embodiments.

As described above, the test data needs to be extended by modulation until the signal band overlaps with the reception band as shown in FIG. 1B or FIG. 1C. There is. For example, a random signal such as a PN code is used. At this time, the data rate (chip rate) of the random signal is the transmission frequency fT and the reception frequency fR.
Is selected in accordance with the frequency interval of. FIG. 1B shows a case where this kind of test data is selected. Also, 1 / (frequency difference between transmission frequency fT and reception frequency fR)
A single-frequency signal having N frequency components may be used. When this kind of test data is selected, FIG.
A line spectrum as shown in (C) appears.

The transmitting section 21 is means for increasing the frequency band of the transmission signal provided from the modulating section 22 to a wireless band. The output of the transmitting unit 21 is provided to a switch 51 and a transmitting unit monitoring unit (not shown). Incidentally, the transmission unit monitoring unit is used to determine whether the transmission system is operating normally by monitoring the signal level of the transmission signal. The signal level of the transmission signal obtained at this time is also used for processing the reception signal level.

The switch 51 connects the transmitting unit 21 and the transmitting antenna 31 during communication, and connects the transmitting unit 21 and the switch 52 during the reception function self-diagnosis (specifically,
Switching means (for connecting a dedicated path (wired path) formed between the switch 52 of the receiving system).

(A-2) Operation of Radio Communication Device As described above, in the radio communication device according to the first embodiment, the switching of the transmission signal at the time of communication and the self-diagnosis of the reception function is performed by the switch 41. The switching of the transmission signal propagation path at the time of communication and at the time of the reception function self-diagnosis is realized by the switches 51 and 52. Hereinafter, the operation performed in each case will be described.

Needless to say, it is assumed that the self-diagnosis function of the reception function is executed during a time period that does not affect the original communication. This is the same in each embodiment described later. The switches 41, 51, and 52 are switched by a switching signal (not shown) (provided by a higher-level device).

At the time of communication First, the operation on the transmitting side will be described. In this case, switch 4
1 selectively inputs the modulated data that has passed through the low-pass filter 40 and outputs the modulated data to the modulation unit 22. Of course, the output of the test data to the modulation unit 22 is cut off.

When the modulation section 22 modulates the modulated data that has passed through the low-pass filter 40 by a predetermined method, the modulation section 22 gives this to the next transmission section 21. The transmission unit 22 multiplies the input transmission signal by a carrier signal supplied from the local oscillator 2, converts the multiplied signal into an appropriate frequency and level, and outputs the converted signal to the switch 51.

At the time of communication, since the connection destination of the switch 51 is selected to the transmission antenna 31 side, the transmission signal is supplied to the transmission antenna 31 and is radiated as radio waves into space.

On the other hand, the operation on the receiving side is as follows. The received signal input from the receiving antenna 32 is
2 to the receiving unit 11. The receiving unit 11 converts the received signal into a frequency and a level that can be demodulated. The receiving section 11 supplies the converted reception signal to the demodulation section 12, and outputs the signal level of the reception signal to a circuit (not shown) as a reception level detection signal.

At the time of the self-diagnosis of the reception function In this case, the switch 41 switches to the test data input side, and selectively outputs the test data to the modulation section 22.
Of course, the output of the signal from the low-pass filter 40 to the modulator 22 is cut off.

The test data at this time is the aforementioned random signal or a signal of an appropriate single frequency. Therefore, the signal band of the transmission signal output from the modulation unit 22 is
It is expanded so as to partially overlap one reception band.

The transmitting section 21 outputs a signal obtained by converting the transmission signal having the extended signal band into an appropriate signal level and frequency.

At this time, the connection destination of the switch 51 has been switched to a dedicated path (wired path) provided for the self-diagnosis of the reception function. Further, the connection destination of the switch 52 is switched to the side of a dedicated path (wired path) provided for the reception function self-diagnosis, instead of the reception antenna 32.

Therefore, the transmission signal whose signal band has been extended is looped back via the switches 51 and 52 and input to the reception unit 11. As described above, since a part of the signal band of the transmission signal overlaps with the reception band, the transmission signal of the overlapping part is received and detected by the receiving unit 11. At this time, the signal level of the received signal becomes a predetermined level corresponding to the signal level of the transmission signal. Receiver 11
Outputs the level of the received signal as a received level detection signal.

It is to be noted that, instead of detecting the reception level of a reception signal received from the partner station via the radio propagation path, the reception level received via a wired path formed in the own station (and the transmission level thereof). Can be monitored), so that the influence of the characteristic variation of the propagation path can be almost ignored, and the detection accuracy of the received signal level can be improved.

Of course, the switch 51 cuts off the signal path to the transmitting antenna 31 and the switch 52 cuts off the signal path to the receiving antenna 32, so that a test signal having a wide band is not radiated into the space.

(A-3) Effect of First Embodiment As described above, according to the first embodiment, the reception function of the own station can be diagnosed using the transmission signal of the own station.
The reliability of the detected reception level can be increased.
Further, since the supply of the transmission signal to the receiving unit is performed via a wired path, there is no influence of the characteristic fluctuation as in the wireless propagation path, and the detection accuracy can be improved.

According to this embodiment, the transmitting unit 21
Can monitor the signal level of the transmission signal output from the receiver, so that the reception level can be detected in consideration of the fluctuation of the signal level. This means that the reception level can be detected in consideration of the variation in the temperature fluctuation inherent to the device.

(B) Second Embodiment (B-1) Configuration of Radio Communication Device with Self-Diagnosis Function FIG. 4 shows a second embodiment of the radio communication device. FIG.
The communication function related to the present invention is expressed as a functional block. FIG. 4 is a diagram showing the same parts as those in FIG. As can be seen by comparing FIG. 4 with FIG. 3, the difference between the second embodiment and the first embodiment is that a part relating to a path for propagating a test signal from the transmission system to its own reception system at the time of self-diagnosis of the reception function. Only.

That is, in the present embodiment, the transmitting antenna 3
A filter 53 whose pass band is set to a normal band is provided between the transmission signal 21 and the transmission unit 21, and either a transmission signal branched before the filter 53 or a reception signal from the reception antenna 32 is provided. The second embodiment is different from the first embodiment only in that a switch 54 for supplying one to the receiving unit 11 is provided.

The connection of the switch 54 is switched so that the receiving antenna 32 and the receiving section 11 are connected during communication, and a dedicated function is formed such that the receiving function can be diagnosed by itself during the self-test of the receiver. The connection is switched so that the path (wired path) is connected to the receiving unit 11.

(B-2) Operation of Radio Communication Apparatus The radio communication apparatus according to the second embodiment switches the transmission signal between the time of communication and the time of self-diagnosis of the reception function by the switch 4.
1 and switching of the transmission signal propagation path at the time of communication and at the time of the reception function self-diagnosis is realized by the switch 54. Hereinafter, the operation performed in each case will be described.

At the time of communication First, the operation on the transmitting side will be described. In this case, switch 4
1 selectively inputs the modulated data that has passed through the low-pass filter 40 and outputs the modulated data to the modulation unit 22. Of course, the output of the test data to the modulation unit 22 is cut off.

When the modulation section 22 modulates the modulated data that has passed through the low-pass filter 40 by a predetermined method, the modulation section 22 gives this to the next transmission section 21. The transmission unit 22 multiplies the input transmission signal by the carrier signal supplied from the local oscillator 2, converts the multiplied signal to an appropriate frequency and level, and outputs the converted signal to the filter 53.

Here, since the pass band of the filter 53 is set to be substantially the same as the band of the transmission signal, the input transmission signal passes through as it is and is radiated from the transmission antenna 31 into space. Note that the transmission signal output from the transmission unit 21 is branched before the filter 53 and supplied to the switch 54, but the switch 54 is connected to the reception antenna 3.
2, the receiving antenna 3 of the signal
2 and the transmission to the receiving unit 11 are cut off.

On the other hand, the operation on the receiving side is as follows. The received signal input from the receiving antenna 32 is
4 to the receiving unit 11. The receiving unit 11 converts the received signal into a frequency and a level that can be demodulated. The receiving section 11 supplies the converted reception signal to the demodulation section 12, and outputs the signal level of the reception signal to a circuit (not shown) as a reception level detection signal.

At the time of the reception function self-diagnosis In this case, the switch 41 is switched to the test data input side, and selectively outputs the test data to the modulation unit 22.
Of course, the output of the signal from the low-pass filter 40 to the modulator 22 is cut off.

The test data at this time is the aforementioned random signal or a signal of an appropriate single frequency. Therefore, the signal band of the transmission signal output from the modulation unit 22 is
It is expanded so as to partially overlap one reception band.

The transmitting section 21 outputs a signal obtained by converting the transmission signal having the extended signal band into an appropriate signal level and frequency. This transmission signal is transmitted to a filter 53 and a switch 54.
Is input to

In this operation, the connection of the switch 54 is switched not to the reception antenna 32 but to a dedicated path (wired path) provided for the self-diagnosis of the reception function. Therefore, the transmission signal whose signal band has been extended is looped back via the dedicated path (wired path) and the switch 54 and input to the receiving unit 11.

As described above, since a part of the signal band of the transmission signal overlaps with the reception band, the transmission signal of the overlapping part is received and detected by the receiving unit 11. At this time, the signal level of the received signal becomes a predetermined level corresponding to the signal level of the transmission signal. The receiving unit 11 outputs the level of the reception signal as a reception level detection signal.

It is to be noted that, instead of detecting the reception level of the reception signal received from the partner station via the radio propagation path, the reception level received via the wired path formed in the own station (and the transmission level thereof). Can be monitored), so that the influence of the characteristic variation of the propagation path can be almost ignored, and the detection accuracy of the received signal level can be improved.

By the way, the signal component in the normal band of the transmission signal input to the filter 53 is given to the transmission antenna 31 and radiated into the space, but the power at this time is reduced by expanding the signal band. The impact on peripheral devices is small. Although a part of the radiated signal can be received by the receiving antenna 32 of the own station, the propagation of the received signal to the receiving unit 11 is cut off by the switch 54. Absent.

(B-3) Effects of the Second Embodiment As described above, according to the second embodiment, it is possible to obtain the same effects as those of the first embodiment.

(C) Third Embodiment (C-1) Configuration of Radio Communication Device with Self-Diagnosis Function FIG. 5 shows a third embodiment of the radio communication device. FIG.
The communication function related to the present invention is expressed as a functional block. FIG. 5 is a diagram showing the same parts as in FIG. As can be seen by comparing FIG. 5 with FIG. 3, the difference between the third embodiment and the first embodiment is that a part related to a path for propagating a test signal from a transmission system to its own reception system at the time of self-diagnosis of a reception function. It is.

That is, in this embodiment, the transmitting antenna 3
A switch 55 that controls the passage and non-passage of a signal by opening and closing the switch is provided between the transmission unit 1 and the transmission unit 21, and a dedicated path through which a transmission signal branched at a preceding stage of the switch 55 is propagated. The third embodiment differs from the first embodiment in that the tip of the line is connected to a signal path connecting the receiving antenna 32 and the receiving unit 11 via a directional coupler 56.

The switch 55 normally closes and opens during the reception function self-diagnosis. In addition, the coupling direction of the directional coupler 56 is a direction in which signal propagation to the reception unit 11 is permitted. That is, signal propagation in the direction of the receiving antenna 32 is prohibited.

(C-2) Operation of Radio Communication Apparatus The radio communication apparatus according to the third embodiment switches the transmission signal between the communication mode and the reception function self-diagnosis with the switch 4.
1, but does not execute the switching of the propagation path of the transmission signal at the time of communication and at the time of self-diagnosis of the reception function. This is to utilize the difference between the transmission band and the reception band.
Hereinafter, the operation performed in each case will be described.

At the time of communication First, the operation on the transmitting side will be described. In this case, switch 4
1 selectively inputs the modulated data that has passed through the low-pass filter 40 and outputs the modulated data to the modulation unit 22. Of course, the output of the test data to the modulation unit 22 is cut off.

When the modulation section 22 modulates the modulated data that has passed through the low-pass filter 40 by a predetermined method, the modulation section 22 supplies the modulated data to the next transmission section 21. The transmission unit 22 multiplies the input transmission signal by the carrier signal supplied from the local oscillator 2, converts the multiplied signal into an appropriate frequency and level, and terminates the signal path (wired path) terminated by the switch 55 and the directional coupler 56. ) And output to

At this time, since the switch 55 is closed, the input transmission signal is directly supplied to the transmission antenna 31 and radiated into the space.

On the other hand, the operation on the receiving side is as follows. The reception signal input from the reception antenna 32 passes through the directional coupler 56 and is provided to the reception unit 11. In this case, since the transmission signal is input to the directional coupler 56 via the signal path (wired path) as described above, the transmission signal is also input to the receiving unit 11.

However, since the reception band of the receiving section 11 is different from the band of the transmission signal, the transmission signal is treated as a noise signal, and only the reception signal is received, and the signal is converted into a frequency and a level that can be demodulated. The receiving section 11 supplies the converted reception signal to the demodulation section 12, and outputs the signal level of the reception signal to a circuit (not shown) as a reception level detection signal.

At the time of the reception function self-diagnosis In this case, the switch 41 switches to the test data input side, and selectively outputs the test data to the modulation section 22.
Of course, the output of the signal from the low-pass filter 40 to the modulator 22 is cut off.

The test data at this time is the aforementioned random signal or a signal of an appropriate single frequency. Therefore, the signal band of the transmission signal output from the modulation unit 22 is
It is expanded so as to partially overlap one reception band.

The transmitting section 21 outputs a signal obtained by converting the transmission signal having the extended signal band into an appropriate signal level and frequency. This transmission signal is branched and output to the switch 55 and the directional coupler 56.

However, since the switch 55 in this case is open and the passage itself is prohibited, the test signal is not radiated from the transmitting antenna 31 into the space. On the other hand, the transmission signal branched to the dedicated route (wired route) is also transmitted to the receiving unit 11 via the directional coupler 56 in this case.
Propagated to However, since the signal band of the transmission signal in this case is extended until a part thereof overlaps with the reception band, the transmission signal having the same band as the reception band is detected by the reception unit 11.

At this time, the signal level of the received signal is a predetermined level corresponding to the signal level of the transmission signal. The receiving unit 11 outputs the level of the reception signal as a reception level detection signal.

It is to be noted that, instead of detecting the reception level of a reception signal received from a partner station via a radio propagation path, the reception level received via a wired path formed in the own station (and the transmission level thereof). Can be monitored), so that the influence of the characteristic variation of the propagation path can be almost ignored, and the detection accuracy of the received signal level can be improved.

(C-3) Effects of the Third Embodiment As described above, according to the third embodiment, the same effects as those of the first embodiment can be obtained.

(D) Fourth Embodiment (D-1) Configuration of Radio Communication Device with Self-Diagnosis Function FIG. 6 shows a radio communication device according to a fourth embodiment. FIG.
The communication function related to the present invention is expressed as a functional block. FIG. 6 is a diagram showing the same parts as in FIG. As can be seen by comparing FIG. 5 with FIG. 3, the difference between the fourth embodiment and the first embodiment is that there is only one antenna, Related to the path to be propagated to the receiving system.

That is, in the present embodiment, the transmitting antenna 3
1 and the receiving antenna 32 in place of the transmitting and receiving antenna 33
The first embodiment is characterized in that only the circulator 58 is used, a circulator 58 is used for realizing a common communication path, and a switch 57 is provided for realizing switching between communication and reception function self-diagnosis. It is different from the form.

The switch 57 closes during communication and opens during reception function self-diagnosis. Further, the coupling direction of the circulator 58 is clockwise in the figure, and the input from the transmitting / receiving common antenna 33 side
The input from the side is output to the transmitting unit 21, and the input from the transmitting unit 21 is output to the shared antenna 33.

Incidentally, it is assumed that the switch 57 is disposed between the transmitting / receiving antenna 33 and the circulator 58.

(D-2) Operation of Radio Communication Apparatus The radio communication apparatus according to the fourth embodiment switches the transmission signal between the communication mode and the reception function self-diagnosis by using the switch 4.
1 and the connection between the transmission / reception antenna 3 and the transmission unit 21 and the reception unit 11 of the own station is switched by the switch 57. Hereinafter, the operation performed in each case will be described.

At the time of communication First, the operation on the transmitting side will be described. In this case, switch 4
1 selectively inputs the modulated data that has passed through the low-pass filter 40 and outputs the modulated data to the modulation unit 22. Of course, the output of the test data to the modulation unit 22 is cut off.

When the modulation section 22 modulates the modulated data that has passed through the low-pass filter 40 by a predetermined method, the modulation section 22 gives this to the next transmission section 21. The transmission unit 22 multiplies the input transmission signal by the carrier signal supplied from the local oscillator 2, converts the multiplied signal to an appropriate frequency and level, and
8 is output.

This transmission signal is output in the direction of the switch 57 and is supplied to the transmission / reception antenna 33 via the switch 57 during the closing operation. Then, the light is radiated into the space via the transmission / reception antenna 33.

On the other hand, the operation on the receiving side is as follows. The reception signal input from the transmission / reception shared antenna 33 is input to the circulator 58 via the switch 57 that is also in the closing operation. This received signal is output to the receiving section 11 through the circulator 58.

When the receiving unit 11 converts the received signal into a frequency and a level that can be demodulated, it provides the converted received signal to the demodulating unit 12. Further, the receiving section 11 outputs the signal level of the received signal to a circuit (not shown) as a received level detection signal.

Incidentally, there is a possibility that a part of the transmission signal is reflected at the boundary between the switch 57 and the transmission line and enters the receiving unit 11 side.
Therefore, there is no problem in the receiving characteristics because the receiving band is different from the receiving band of No. 1.

At the time of the reception function self-diagnosis In this case, the switch 41 switches to the test data input side, and selectively outputs the test data to the modulation section 22.
Of course, the output of the signal from the low-pass filter 40 to the modulator 22 is cut off.

The test data at this time is the aforementioned random signal or a signal of an appropriate single frequency. Therefore, the signal band of the transmission signal output from the modulation unit 22 is
It is expanded so as to partially overlap one reception band.

The transmitting section 21 outputs a signal obtained by converting the transmission signal having the extended signal band into an appropriate signal level and frequency. This transmission signal is output to the switch 57 through the circulator 58.

However, in this case, since the switch 57 is open, total reflection occurs at the boundary surface with the transmission line, and the transmission signal as a reflected wave is input to the circulator 58 again. Then, the transmission signal input from the switch 57 to the circulator 58 is input to the reception unit 11.

Needless to say, no transmission signal is given to the shared antenna 33 via the switch 57, so that there is no need to worry about unnecessary radiation.

Since the signal band of the transmission signal looped back to the receiving unit 11 is extended until a part thereof overlaps with the receiving band, a transmitting signal having the same band as the receiving band is detected by the receiving unit 11. Is done.

At this time, the signal level of the received signal is a predetermined level corresponding to the signal level of the transmission signal. The receiving unit 11 outputs the level of the reception signal as a reception level detection signal.

It is to be noted that, instead of detecting the reception level of the reception signal received from the partner station via the radio propagation path, the reception level received via the wired path formed in the own station (and the transmission level thereof). Can be monitored), so that the influence of the characteristic variation of the propagation path can be almost ignored, and the detection accuracy of the received signal level can be improved.

(D-3) Effect of Fourth Embodiment As described above, according to the fourth embodiment, the same effect as that of the first embodiment can be obtained.

(E) Fifth Embodiment (E-1) Configuration of Radio Communication Device with Self-Diagnosis Function FIG. 7 shows a radio communication device according to a fifth embodiment. FIG.
The communication function related to the present invention is expressed as a functional block. FIG. 7 is a diagram showing the same parts as in FIG. As can be seen by comparing FIG. 7 with FIG. 3, the difference between the fifth embodiment and the first embodiment is that a part relating to a path for propagating a test signal from a transmission system to its own reception system during reception function self-diagnosis. It is.

That is, the present embodiment differs from the first embodiment in that a leaky radio path formed between the transmitting antenna 31 and the receiving antenna 32 of the own station is used. This adopts the same configuration as the conventional configuration except that the modulation data in the normal band and the test data to be widened can be switched.

(E-2) Operation of Radio Communication Apparatus The radio communication apparatus according to the fifth embodiment switches the transmission signal between the communication mode and the reception function self-diagnosis with the switch 4.
It is only realized by switching 1. Hereinafter, the operation performed in each case will be described.

At the time of communication First, the operation on the transmitting side will be described. In this case, switch 4
1 selectively inputs the modulated data that has passed through the low-pass filter 40 and outputs the modulated data to the modulation unit 22. Of course, the output of the test data to the modulation unit 22 is cut off.

When the modulation section 22 modulates the modulated data that has passed through the low-pass filter 40 by a predetermined method, the modulation section 22 gives this to the next transmission section 21. The transmission unit 22 multiplies the input transmission signal by the carrier signal supplied from the local oscillator 2, converts the multiplied signal into an appropriate frequency and level, and
Output to

This transmission signal is radiated from the transmission antenna 31 into space.

On the other hand, the operation on the receiving side is as follows. The reception signal input from the reception antenna 32 is
Is input to At this time, a leak signal from the transmission antenna 31 may be input, but since the reception band of the reception unit 11 is different from the band of the transmission signal, there is no influence on reception.

When the receiving unit 11 converts the received signal into a demodulated frequency and level, it provides the demodulated unit 12 with the converted received signal. Further, the receiving section 11 outputs the signal level of the received signal to a circuit (not shown) as a received level detection signal.

At the time of the reception function self-diagnosis In this case, the switch 41 switches to the test data input side, and selectively outputs the test data to the modulation unit 22.
Of course, the output of the signal from the low-pass filter 40 to the modulator 22 is cut off.

The test data at this time is the aforementioned random signal or a signal of an appropriate single frequency. Therefore, the signal band of the transmission signal output from the modulation unit 22 is
It is expanded so as to partially overlap one reception band.

The transmitting section 21 outputs a signal obtained by converting the transmission signal having the extended signal band into an appropriate signal level and frequency. This transmission signal is radiated into the space through the transmission antenna 31.

The radiated transmission signal propagates in space, and a part of the radiated transmission signal is input to the receiving antenna 32 as a leak signal. The transmission signal received by the receiving antenna 32 is
The data is input to the receiving unit 11 as in the case of communication.

The signal band of the transmission signal in this case is different from the signal band at the time of communication, and is extended until a part of the signal band overlaps with the reception band. Therefore, the transmission signal having the same band as the reception band is received. It is detected by the unit 11.

At this time, the signal level of the received signal becomes a predetermined level corresponding to the signal level of the transmission signal. The receiving unit 11 outputs the level of the reception signal as a reception level detection signal.

It is to be noted that, instead of detecting the reception level of the reception signal received from the partner station via the radio propagation path, the reception level received via the leak radio path formed in the space close to the own station ( In addition, since the fluctuation of the transmission level can be monitored, the influence of the characteristic variation of the propagation path can be relatively reduced, and the detection accuracy of the received signal level can be improved.

(E-3) Effects of the Fifth Embodiment As described above, also in the fifth embodiment, the case where the wired path formed inside the own station is used in that the leak radio path is used. Although the possibility of being affected by the transmission characteristics cannot be denied as compared with the above, it is possible to detect the reception level more stably than the fluctuation of the propagation characteristics that occurs in the communication path.

Further, in the case of this embodiment, a special path (priority path) or circuit element for internally turning back the transmission signal of the own station is not required, so that the circuit size and cost can be reduced. realizable.

Also in the case of this embodiment, the transmission unit 21
Needless to say, it is possible to monitor the signal level of the transmission signal output from, and to detect the reception level in consideration of the fluctuation of the signal level. That is, it is possible to realize the detection of the reception level in consideration of the variation of the temperature variation unique to the device.

(F) Sixth Embodiment (F-1) Configuration of Radio Communication Device with Self-Diagnosis Function FIG. 8 shows a radio communication device according to a sixth embodiment. FIG.
The communication function related to the present invention is expressed as a functional block. This embodiment is similar to the first embodiment described above.
The wireless communication device according to the embodiment is provided with a function of correcting a reception level. Therefore, as can be seen from FIG. 8 in which the same reference numerals are given to the same portions in FIG. 3, only the reception level correction unit 60 is a component unique to the sixth embodiment.

The reception level correction section 60 includes a detection section 61
, A correction unit 62, a correction amount calculation unit 63, and a correction value memory 64. The detection unit 61 is a unit that detects the signal level of the reception level detection signal output from the reception unit 11. The correction unit 62 is a unit that corrects the signal level of the reception level detection signal input from the detection unit 61 based on the correction amount provided through the correction amount calculation unit 63.

At the time of self-diagnosis of the reception function, the correction amount calculation section 63 calculates a difference value between the detection value detected by the detection section 61 and the reception level converted from the transmission signal notified from the transmission section 21. This is a means for storing the calculated difference value as a correction value in the correction value memory 64 (the purpose is to cancel the level fluctuation of the transmission signal). Further, the correction amount calculation unit 63 also has a function of giving the correction value calculated at this time to the correction unit 62. On the other hand, the correction amount calculation section 63 functions as a means for giving a correction value to be given to the detection value detected by the detection section 61 to the correction section 62 in a normal state (during communication).

The correction value memory 64 is storage means for holding the correction amount calculated by the correction amount calculating section 63 until the next reception function self-diagnosis.

(F-2) Operation of Radio Communication Device As described above, in the radio communication device according to the sixth embodiment, the switching of the transmission signal at the time of communication and at the time of self-diagnosis of the reception function is performed by the switch 41. The switching of the transmission signal propagation path at the time of communication and at the time of the reception function self-diagnosis is realized by the switches 51 and 52. Hereinafter, the operation performed in each case will be described.

Needless to say, the self-diagnosis function of the reception function is executed during a time period that does not affect the original communication.

At the time of communication First, the operation on the transmitting side will be described. In this case, switch 4
1 selectively inputs the modulated data that has passed through the low-pass filter 40 and outputs the modulated data to the modulation unit 22. Of course, the output of the test data to the modulation unit 22 is cut off. This switching is performed in synchronization with the test signal.

When the modulation section 22 modulates the modulated data that has passed through the low-pass filter 40 by a predetermined method, the modulation section 22 gives this to the next transmission section 21. The transmission unit 22 multiplies the input transmission signal by a carrier signal supplied from the local oscillator 2, converts the multiplied signal into an appropriate frequency and level, and outputs the converted signal to the switch 51.

At the time of communication, since the connection destination of the switch 51 is selected to the transmission antenna 31 side, the transmission signal is supplied to the transmission antenna 31 and radiated into the space as radio waves.

On the other hand, the operation on the receiving side is as follows. The received signal input from the receiving antenna 32 is
2 to the receiving unit 11. The receiving unit 11 converts the received signal into a frequency and a level that can be demodulated. The receiving section 11 supplies the converted received signal to the demodulation section 12 and outputs the signal level of the received signal to the reception level correction section 60 as a reception level detection signal.

The reception level detection signal input to the reception level correction section 60 is input to the correction section 62 through the detection section 61, and based on the previously calculated and held correction amount, the signal of the reception level detection signal is output. The level is corrected and output. As a result, it is possible to obtain a reception level detection signal in which factors on the local station side (effects of the reception characteristics and the temperature characteristics of the reception unit) are canceled.

At the time of the reception function self-diagnosis In this case, the switch 41 switches to the test data input side and selectively outputs the test data to the modulation section 22.
Of course, the output of the signal from the low-pass filter 40 to the modulator 22 is cut off.

The test data at this time is the aforementioned random signal or a signal of an appropriate single frequency. Therefore, the signal band of the transmission signal output from the modulation unit 22 is
It is expanded so as to partially overlap one reception band.

The transmitting section 21 outputs a signal obtained by converting the transmission signal having the extended signal band into an appropriate signal level and frequency.

At this time, the connection destination of the switch 51 has been switched to the dedicated path (wired path) provided for the reception function self-diagnosis. Further, the connection destination of the switch 52 is switched to the side of a dedicated path (wired path) provided for the reception function self-diagnosis, instead of the reception antenna 32.

Therefore, the transmission signal whose signal band has been extended is looped back via switches 51 and 52 and input to receiving section 11. As described above, since a part of the signal band of the transmission signal overlaps with the reception band, the transmission signal of the overlapping part is received and detected by the receiving unit 11. At this time, the signal level of the received signal becomes a predetermined level corresponding to the signal level of the transmission signal. Receiver 11
Outputs the level of the received signal as a received level detection signal.

The reception level detection signal is input to the detection section 61 of the reception level correction section 60, and the signal level is detected. Here, the correction amount calculation unit 63 calculates a difference between the signal level notified from the detection unit 61 and the signal level converted from the transmission level detection signal input from the transmission unit 21 as a correction value, The correction value is stored in the correction value memory 6
4 is stored. Further, the correction amount calculation unit 63 gives the calculated correction value to the correction unit 62, and uses it for correcting the reception level detection signal.

As described above, instead of detecting the reception level of the reception signal received from the partner station via the radio propagation path,
Since the reception level (and the fluctuation of the transmission level can be monitored) received through a wired path formed in the own station is detected, the influence of the characteristic variation of the propagation path can be almost ignored, and the reception signal level can be reduced. Detection accuracy can be improved.

Of course, since the switch 51 cuts off the signal path to the transmitting antenna 31 and the switch 52 cuts off the signal path to the receiving antenna 32, the test signal having a wide band is not radiated into the space. This is similar to the first embodiment.

(F-3) Effects of the Sixth Embodiment As described above, according to the sixth embodiment, by combining the first embodiment and the function of the reception level correction unit 60, Characteristic factors unique to the receiving system can be reliably canceled. In other words, the corrected reception level accurately reflects the influence of the variation in the characteristics of the wireless propagation path, thereby improving the reliability of the detected reception level and improving the accuracy of the subsequent signal processing. it can.

(G) Seventh Embodiment FIG. 9 shows a wireless communication apparatus according to a seventh embodiment. FIG.
The communication function related to the present invention is expressed as a functional block. This embodiment is similar to the second embodiment described above.
The wireless communication device according to the embodiment is provided with a function of correcting a reception level.

That is, in the radio communication apparatus according to this embodiment, the configuration of the reception level correction unit 60 is the same as that of the sixth embodiment, and the other components are the same as those of the second embodiment. Therefore, the detailed description is omitted since it is repeated.

In the case of this embodiment, the reception level detection signal that is normally detected is corrected based on the correction amount calculated based on the transmission signal that has been turned back through the switch 54 during the reception function self-diagnosis. Thereby, the accuracy of the detected reception level detection signal is improved.

As described above, according to the seventh embodiment, by combining the second embodiment with the function of the reception level correcting section 60, it is possible to surely cancel characteristic factors unique to the reception system. Can be made possible. In other words, the corrected reception level accurately reflects the influence of the variation in the characteristics of the wireless propagation path, thereby improving the reliability of the detected reception level and improving the accuracy of the subsequent signal processing. it can.

(H) Eighth Embodiment FIG. 10 shows an eighth embodiment of the wireless communication apparatus. FIG.
Represents a communication function portion related to the present invention as a functional block. In this embodiment, the wireless communication device according to the third embodiment is provided with a function of correcting a reception level.

That is, in the radio communication apparatus according to this embodiment, the configuration of the reception level correction unit 60 is the same as that of the sixth embodiment, and the other components are the same as those of the third embodiment. Therefore, the detailed description is omitted since it is repeated.

In the case of this embodiment, the reception level detection signal normally detected based on the correction amount calculated based on the transmission signal turned back through the directional coupler 56 during the self-diagnosis of the reception function. Is corrected, the accuracy of the detected reception level detection signal is improved.

As described above, according to the eighth embodiment, by combining the function of the third embodiment with the function of the reception level correcting section 60, the characteristic factors unique to the reception system can be reliably canceled. Can be made possible. In other words, the corrected reception level accurately reflects the influence of the variation in the characteristics of the wireless propagation path, thereby improving the reliability of the detected reception level and improving the accuracy of the subsequent signal processing. it can.

(I) Ninth Embodiment FIG. 11 shows a ninth embodiment of the wireless communication apparatus. FIG.
Represents a communication function portion related to the present invention as a functional block. In this embodiment, the wireless communication apparatus according to the above-described fourth embodiment is provided with a reception level correction function.

That is, in the radio communication apparatus according to this embodiment, the configuration of the reception level correction unit 60 is the same as that of the sixth embodiment, and the other components are the same as those of the fourth embodiment. Therefore, the detailed description is omitted since it is repeated.

In the case of this embodiment, the circulator 58 and the transmitting / receiving antenna 3
3 is corrected based on a correction amount calculated based on a transmission signal totally reflected by the switch 57 provided between the switch and the reception level detection signal. The accuracy of the detection signal is improved.

As described above, according to the ninth embodiment, by combining the fourth embodiment with the function of the reception level correcting section 60, characteristic factors unique to the reception system can be reliably canceled. Can be made possible. In other words, the corrected reception level accurately reflects the influence of the variation in the characteristics of the wireless propagation path, thereby improving the reliability of the detected reception level and improving the accuracy of the subsequent signal processing. it can.

(J) Tenth Embodiment FIG. 12 shows a tenth embodiment of the wireless communication apparatus. FIG.
Reference numeral 2 represents a communication function portion related to the present invention as a functional block. In this embodiment, the wireless communication apparatus according to the above-described fifth embodiment is provided with a reception level correction function.

That is, in the radio communication apparatus according to this embodiment, the configuration of the reception level correction unit 60 is the same as that of the sixth embodiment, and the other components are the same as those of the fifth embodiment. Therefore, the detailed description is omitted since it is repeated.

In the case of this embodiment, at the time of normal operation, the correction amount calculated based on the transmission signal leaked from the transmitting antenna 31 to the receiving antenna 32 via the radio path during the receiving function self-diagnosis is used. By correcting the detected reception level detection signal, the accuracy of the detected reception level detection signal is improved.

As described above, according to the tenth embodiment, by combining the fifth embodiment with the function of the reception level correcting section 60, characteristic factors unique to the reception system can be canceled as much as possible. Can be possible. In other words, the corrected reception level accurately reflects the influence of the variation in the characteristics of the wireless propagation path, thereby improving the reliability of the detected reception level and improving the accuracy of the subsequent signal processing. it can.

(K) Eleventh Embodiment (K-1) Configuration of Radio Communication Device with Self-Diagnosis Function FIG. 13 shows an eleventh embodiment of the radio communication device. FIG.
Reference numeral 3 represents a related communication function portion of the present invention as a functional block. This embodiment uses the wireless communication apparatus according to the above-described sixth embodiment for the basic configuration, but further adds a transmission level switching function.

Therefore, as can be seen from FIG. 13 in which the same parts as in FIG. 8 are denoted by the same reference numerals, the difference in structure is that the transmission level switching signal is input to each of the transmission unit 21 and the correction amount calculation unit 63. It is only the point that is. Other configurations are the same as those of the sixth embodiment.

However, the functions of the transmission unit 21 and the correction amount calculation unit 63 to which the transmission level switching signal is input are partially changed. First, the transmission unit 21 will be described.
Has a function of changing the transmission level by inputting a transmission level switching signal. This variable function may be changed in any number of stages, but in this embodiment, the switching is performed in two stages. In that sense, the transmission level switching signal is given a name.

On the other hand, the correction amount calculating section 63 has a function of calculating the correction amount again when a transmission level switching signal is input. In other words, before and after the switching of the transmission level by the transmission level switching signal, the correction amount calculation unit 63 performs two steps for different transmission levels.
It has a function of calculating the type of correction amount.

The correction amount calculating section 63 changes the correction amount (or the relationship between the change in the inclination of the reception level detection signal and the change in the transmission level) accompanying the switching of the transmission level from the two types of correction values. Is calculated, and a correction value reflecting the change in the transmission level is calculated. For example, an average value of two types of correction values is used. Of course, this is only an example, and appropriate weighting may be performed, a proper value may be substituted into a predetermined function, or an appropriate correction value may be read from a table storing a predetermined relationship.

As described above, in the correction amount calculating section 63,
Since the correction amount is calculated based on the reception level detection signals obtained for a plurality of transmission levels, more accurate correction can be performed even when the reception level covers a wide range.

(K-2) Operation of Radio Communication Device As described above, in the radio communication device according to the eleventh embodiment, the switching of the transmission signal at the time of communication and at the time of self-diagnosis of the reception function is performed by the switch 41. The switching of the transmission signal propagation path at the time of communication and at the time of the reception function self-diagnosis is realized by the switches 51 and 52. Hereinafter, the operation performed in each case will be described.

Needless to say, the self-diagnosis function of the reception function is executed during a time period that does not affect the original communication.

At the time of communication First, the operation on the transmitting side will be described. In this case, switch 4
1 selectively inputs the modulated data that has passed through the low-pass filter 40 and outputs the modulated data to the modulation unit 22. Of course, the output of the test data to the modulation unit 22 is cut off. This switching is performed in synchronization with the test signal.

When the modulation section 22 modulates the modulated data that has passed through the low-pass filter 40 by a predetermined method, the modulation section 22 gives this to the next transmission section 21. The transmission unit 22 multiplies the input transmission signal by a carrier signal supplied from the local oscillator 2, converts the multiplied signal into an appropriate frequency and level, and outputs the converted signal to the switch 51.

At the time of communication, since the connection destination of the switch 51 is selected to the transmission antenna 31, the transmission signal is supplied to the transmission antenna 31 and radiated into the space as radio waves.

On the other hand, the operation on the receiving side is as follows. The received signal input from the receiving antenna 32 is
2 to the receiving unit 11. The receiving unit 11 converts the received signal into a frequency and a level that can be demodulated. The receiving section 11 supplies the converted received signal to the demodulation section 12 and outputs the signal level of the received signal to the reception level correction section 60 as a reception level detection signal.

The reception level detection signal input to the reception level correction section 60 is input to the correction section 62 through the detection section 61, and the signal of the reception level detection signal is calculated based on the previously calculated and held correction amount. The level is corrected and output. As a result, it is possible to obtain a reception level detection signal in which factors on the local station side (effects of the reception characteristics and the temperature characteristics of the reception unit) are canceled.

At the time of the reception function self-diagnosis In this case, the switch 41 switches to the test data input side, and selectively outputs the test data to the modulation unit 22.
Of course, the output of the signal from the low-pass filter 40 to the modulator 22 is cut off.

The test data at this time is the aforementioned random signal or a signal of an appropriate single frequency. Therefore, the signal band of the transmission signal output from the modulation unit 22 is
It is expanded so as to partially overlap one reception band.

The transmitting section 21 outputs a signal obtained by converting the transmission signal having the extended signal band into an appropriate signal level (here, referred to as “first signal level”) and frequency.

At this time, the connection destination of the switch 51 has been switched to the dedicated route (wired route) provided for the self-diagnosis of the reception function. Further, the connection destination of the switch 52 is switched to the side of a dedicated path (wired path) provided for the reception function self-diagnosis, instead of the reception antenna 32.

Therefore, the transmission signal whose signal band has been extended is looped back via switches 51 and 52 and input to receiving section 11. As described above, since a part of the signal band of the transmission signal overlaps with the reception band, the transmission signal of the overlapping part is received and detected by the receiving unit 11. At this time, the signal level of the received signal becomes a predetermined level corresponding to the signal level of the transmission signal. Receiver 11
Outputs the level of the reception signal as a reception level detection signal (here, referred to as a “first reception level detection signal”).

The first reception level detection signal is input to the detection section 61 of the reception level correction section 60, and the signal level is detected. Here, the correction amount calculation unit 63 includes the detection unit 6
The difference between the signal level notified from 1 and the signal level converted from the transmission level detection signal input from the transmission unit 21 is calculated as a correction value, and the correction value is stored in the correction value memory 64.

When the calculation of the correction amount based on the first transmission level is completed, the transmission level switching signal is
1 and the reception level correction unit 60.

In this case, transmitting section 21 outputs the transmission signal whose signal band has been extended at a transmission level different from the previous transmission level (here, referred to as “second transmission level”). The transmission level may be set to be relatively increased, or may be set to be lowered.

This transmission signal is also looped back via the switches 51 and 52 and input to the receiving section 11. In the case of this transmission signal as well, a part of the signal band overlaps with the reception band. Therefore, the transmission signal in the overlapping portion is received and detected by the reception unit 11. At this time, the signal level of the received signal becomes a predetermined level corresponding to the signal level of the transmission signal. The receiving section 11 outputs the level of the received signal as a second received level detection signal.

Then, the detection unit 6 of the reception level correction unit 60
At 1, the signal level of the second reception level detection signal is detected and provided to the correction amount calculating section 63. Here, the correction amount calculation unit 63 calculates a difference between the signal level notified from the detection unit 61 and the signal level converted from the transmission level detection signal input from the transmission unit 21 as a correction value, The correction value is stored in the correction value memory 64.

As described above, the correction amount calculating section 63 outputs the two types of reception level detection signals (ie, the first transmission level and the second transmission level) obtained for each of the two types of transmission levels (ie, the first transmission level and the second transmission level). When two types of correction values are obtained for the first reception level detection signal and the second reception level detection signal), the correction amount is optimized by a predetermined method, and a new correction after the optimization is performed. The value is given to each of the correction value memory 64 and the correction unit 62.

As described above, in the case of the present embodiment, not only the reception level detection signal obtained for a specific transmission level but also the final reception level detection signal obtained from a plurality of reception level detection signals obtained for different transmission levels. Therefore, even when the fluctuation of the reception level is wide, a highly accurate correction can be realized over the entire range.

(K-3) Effect of Eleventh Embodiment As described above, according to the eleventh embodiment, a plurality of reception level detection signals having different transmission levels from the sixth embodiment are used. By combining this with the function of comprehensively determining the correction amount, it is possible to reliably cancel characteristic factors unique to the receiving system for a wide range of receiving levels. In other words, the corrected reception level accurately reflects the influence of the variation in the characteristics of the wireless propagation path, thereby improving the reliability of the detected reception level and improving the accuracy of the subsequent signal processing. it can.

(L) Twelfth Embodiment FIG. 14 shows a twelfth embodiment of the wireless communication apparatus. FIG.
Reference numeral 4 represents a communication function portion related to the present invention as a functional block. In this embodiment, the wireless communication apparatus according to the seventh embodiment is provided with the correction amount optimizing function (two types of reception level detection signals having different transmission levels, respectively) detected in the eleventh embodiment. (A function of optimizing the correction amount based on the type of reception level).

That is, in the radio communication apparatus according to this embodiment, the configuration of the reception level correction section 60 and the transmission section 21 is the first.
The other components are the same as those of the seventh embodiment, and are the same as those of the seventh embodiment. Therefore, the detailed description is omitted since it is repeated.

In the case of this embodiment, the first and second transmission signals are looped back to the receiving section 11 through the switch 54 during the self-diagnosis of the receiving function, and the reception level of the reception level detection signal is transmitted to the reception level correction section 60. Respectively. Then, an optimum correction value is calculated based on the two types of reception levels. Needless to say, the calculated correction value is used for correcting the signal level of the reception level detection signal detected at the normal time, and the accuracy of the reception level detection signal detected even when the reception level varies over a wide band. Is improved.

As described above, according to the twelfth embodiment, by combining the radio communication apparatus according to the seventh embodiment with the correction amount optimizing function according to the eleventh embodiment, the reception level can be reduced. Even when the fluctuations are wide, it is possible to reliably cancel characteristic factors unique to the receiving system in the wide range. In other words, the corrected reception level accurately reflects the influence of the variation in the characteristics of the wireless propagation path, thereby improving the reliability of the detected reception level and improving the accuracy of the subsequent signal processing. it can.

(M) Thirteenth Embodiment FIG. 15 shows a wireless communication apparatus according to a thirteenth embodiment. FIG.
Reference numeral 5 represents a related communication function part of the present invention as a functional block. In this embodiment, the wireless communication apparatus according to the above-described eighth embodiment includes the correction amount optimizing function (the two types of reception level detection signals detected at two different transmission levels) of the eleventh embodiment. (A function of optimizing the correction amount based on the type of reception level).

That is, in the radio communication apparatus according to this embodiment, the configuration of the reception level correction unit 60 and the transmission unit 21 is the first.
The other components are the same as those of the eighth embodiment, and are the same as those of the eighth embodiment. Therefore, the detailed description is omitted since it is repeated.

In this embodiment, the first and second transmission signals are supplied to the directional coupler 56 at the time of self-diagnosis of the reception function.
The signal is looped back to the receiving unit 11, and the reception level of the reception level detection signal is detected by the reception level correction unit 60. Then, an optimum correction value is calculated based on the two types of reception levels. Needless to say, the calculated correction value is used for correcting the signal level of the reception level detection signal detected at the normal time, and the accuracy of the reception level detection signal detected even when the reception level varies over a wide band. Is improved.

As described above, according to the thirteenth embodiment, by combining the radio communication apparatus according to the eighth embodiment with the correction amount optimizing function according to the eleventh embodiment, the reception level can be reduced. Even when the fluctuations are wide, it is possible to reliably cancel characteristic factors unique to the receiving system in the wide range. In other words, the corrected reception level accurately reflects the influence of the variation in the characteristics of the wireless propagation path, thereby improving the reliability of the detected reception level and improving the accuracy of the subsequent signal processing. it can.

(N) Fourteenth Embodiment FIG. 16 shows a fourteenth embodiment of the wireless communication apparatus. FIG.
Reference numeral 6 represents a communication function portion related to the present invention as a functional block. In the present embodiment, the wireless communication apparatus according to the ninth embodiment is provided with the correction amount optimizing function (two types of reception level detection signals having different transmission levels, respectively) detected in the eleventh embodiment. (A function of optimizing the correction amount based on the type of reception level).

That is, in the radio communication apparatus according to this embodiment, the configuration of the reception level correction unit 60 and the transmission unit 21 is the first.
The other components are the same as those of the ninth embodiment, as in the first embodiment. Therefore, the detailed description is omitted since it is repeated.

In the case of this embodiment, the first and second transmission signals are supplied to the circulator 5 at the time of self-diagnosis of the reception function.
The light is totally reflected by the switch 57 provided between the transmission / reception antenna 8 and the transmission / reception antenna 33 and is returned to the reception unit 11. The reception level of the reception level detection signal corresponding to the first and second transmission signals is detected by the reception level correction unit 60, respectively. Then, an optimum correction value is calculated based on the two types of reception levels. Needless to say, the calculated correction value is used for correcting the signal level of the reception level detection signal detected at the normal time, and the accuracy of the reception level detection signal detected even when the reception level varies over a wide band. Is improved.

As described above, according to the fourteenth embodiment, by combining the radio communication apparatus according to the ninth embodiment with the correction amount optimizing function according to the eleventh embodiment, the reception level can be reduced. Even when the fluctuations are wide, it is possible to reliably cancel characteristic factors unique to the receiving system in the wide range. In other words, the corrected reception level accurately reflects the influence of the variation in the characteristics of the wireless propagation path, thereby improving the reliability of the detected reception level and improving the accuracy of the subsequent signal processing. it can.

(O) Fifteenth Embodiment FIG. 17 shows a fifteenth embodiment of the wireless communication apparatus. FIG.
Numeral 7 represents a communication function portion related to the present invention as a functional block. This embodiment is different from the wireless communication apparatus according to the tenth embodiment in that the correction amount optimizing function (two types of reception level detection signals having different transmission levels detected in the eleventh embodiment) Function to optimize the amount of correction from different types of reception levels)
It is equipped with.

That is, in the radio communication apparatus according to this embodiment, the configuration of the reception level correction section 60 and the transmission section 21 is the first.
The other components are the same as those of the tenth embodiment, and are the same as those of the tenth embodiment. Therefore, the detailed description is omitted since it is repeated.

In this embodiment, the first and second transmission signals are transmitted by the transmission antenna 31 at the time of self-diagnosis of the reception function.
Is leaked to the receiving antenna 32 via the radio path, and is returned to the receiving unit 11. The reception level of the reception level detection signal corresponding to the first and second transmission signals is detected by the reception level correction unit 60, respectively. Then, an optimum correction value is calculated based on the two types of reception levels. Needless to say, the calculated correction value is used for correcting the signal level of the reception level detection signal detected at the normal time, and the accuracy of the reception level detection signal detected even when the reception level varies over a wide band. Is improved.

As described above, according to the fifteenth embodiment, the wireless communication apparatus according to the tenth embodiment is provided with the eleventh embodiment.
By combining the correction amount optimizing function in the embodiment, even when the fluctuation of the reception level is wide, it is possible to minimize the characteristic factors unique to the reception system in the range. In other words, the corrected reception level accurately reflects the influence of the variation in the characteristics of the wireless propagation path, thereby improving the reliability of the detected reception level and improving the accuracy of the subsequent signal processing. it can.

(P) Other Embodiments The above-mentioned wireless communication devices include a portable communication terminal (mobile phone, portable information terminal, IC card, etc.) and a stationary communication terminal (wireless LAN device, home electric appliance, in-vehicle device, etc.). Telephones, over-the-counter vending machines, and other information-managed communication terminals), fixed station devices, and the like can be applied.

In the above-described embodiment, the number of antennas is one.
The case of the book and the case of the two are described.
The present invention can also be applied to the case of an apparatus having more than one.

In the above-described embodiment, the case where the final correction amount is determined based on the reception levels of the two types of reception level detection signals obtained by switching the transmission levels has been described. As long as the time that can be assigned to is allowed, three or more types of reception levels referred to here may be used (that is, three or more transmission levels are switched, and a correction value is determined based on the detection result. You may do it.)

[0209]

(A) According to the first aspect of the present invention,
When the self-diagnosis function is executed, the transmission band transmitted by the other party is transmitted to the signal source by extending the modulation band of the transmission signal transmitted by itself from the normal band so that a part of the transmission power falls within the reception band. Instead, it is possible to detect a reception level using its own transmission signal as a signal source. As a result, the detection accuracy of the reception level can be improved.

(B) According to the second aspect of the present invention, there is provided a method in which a transmission signal transmitted at the time of executing the self-diagnosis function is supplied to a receiving unit via a wired path formed therein. By combining the present invention with the described invention, the characteristics of the propagation path can be stabilized, and the reliability of the reception level detected by the receiving unit can be improved.

(C) According to the third aspect of the present invention, the transmission signal transmitted at the time of executing the self-diagnosis function is obtained by inputting a part of the signal radiated from the transmission antenna to the reception antenna as a leak signal. By combining the supplied method with the invention described in claim 1, a dedicated communication path for executing a self-diagnosis of the receiving function can be dispensed with inside the device, and the circuit size can be reduced. it can.

(D) According to the invention described in claim 4, the received signal level is determined based on the difference value between the received signal level at the time of executing the self-diagnosis function and the converted received signal level of the transmission signal transmitted by itself. By combining the method of determining the level correction amount with the invention according to any one of the first to third aspects, the accuracy of the correction amount can be increased, and the reliability of the reception level is further improved accordingly. be able to.

(E) According to the fifth aspect of the present invention, the calculation of the difference between the received signal level at the time of executing the self-diagnosis function and the converted received signal level of the transmitted signal transmitted by the self-diagnosis function is performed by different transmission. By combining the method of executing the signal level a plurality of times and determining the correction value based on the calculation results of the plurality of times with the invention according to the fourth aspect, the characteristic variation of the reception level over a wide range can be accurately detected. Can be guaranteed.

(F) According to the invention described in claim 6, a transmission signal of a normal band whose band is limited during communication is transmitted to a device for self-diagnosis of a reception function of a communication device having a transmission unit and a reception unit. A transmission signal switching unit that supplies the transmission unit with a transmission signal whose band is extended until a part of the transmission power enters the reception band when the self-diagnosis function is performed, thereby transmitting the transmission signal transmitted by the other party. Is not a signal source, but a reception level using its own transmission signal as a signal source can be detected. As a result, the detection accuracy of the reception level can be improved.

(G) According to the seventh aspect of the present invention, a wired path for supplying a transmission signal at the time of executing the self-diagnosis function to the receiving unit is further provided in the sixth aspect of the invention. The characteristics of the propagation path can be stabilized, and the reliability of the reception level detected by the receiving unit can be improved.

(H) According to the eighth aspect of the present invention, a transmission signal is supplied to a transmission antenna during communication over the wired path according to the seventh aspect of the invention, and the transmission signal is transmitted during execution of a self-diagnosis function. A first switching unit that supplies a signal transmitted from the receiving antenna to the receiving unit during communication, and a second switching unit that supplies a signal transmitted from the wired path to the receiving unit during execution of the self-diagnosis function. With this configuration, the separation of the signal paths can be reliably realized, and the detection accuracy of the reception level can be improved.

(I) According to the ninth aspect of the present invention, only the signal component of the normal band of the transmission signal output from the transmission section is supplied to the transmission antenna through the wired path according to the seventh aspect of the invention. Signal means by supplying a reception signal from a reception antenna to a reception unit during communication, and a switching means for supplying a transmission signal from the wired path to the reception unit when performing a self-diagnosis function. The separation of the paths can be reliably realized, and the detection accuracy of the reception level can be improved.

(J) According to the tenth aspect of the present invention,
8. A switch for closing the wired path according to the invention according to claim 7 for supplying a transmission signal to the transmitting antenna during communication and for opening the self-diagnosis function to inhibit supply of the transmitting signal to the transmitting antenna. And a directional coupling that supplies a reception signal from the reception antenna to the reception unit during communication and supplies a transmission signal from the wired path to the reception unit when performing the self-diagnosis function, but prevents propagation in the direction of the reception antenna. With this configuration, the separation of the signal path can be reliably realized, and the detection accuracy of the reception level can be improved.

(K) According to the eleventh aspect of the present invention,
In the case where the wired path according to the invention of claim 7 uses a shared antenna for transmission and reception, a closed signal is transmitted and transmitted between the shared antenna for transmission and reception and the transmission unit and the reception unit during communication. Or, a switch that permits the passage of the received signal, opens when the self-diagnosis function is performed, and prohibits the supply of the transmission signal to the transmission / reception antenna, and a reception signal that is input from the switch during communication to the reception unit. Supply and transmit the transmission signal from the transmission unit to the transmission / reception antenna via the switch. When the self-diagnosis function is performed, supply the transmission signal from the transmission unit reflected by the switch to the reception unit. By using the circulator, the separation of the signal path can be reliably realized, and the detection accuracy of the reception level can be improved.

(L) According to the twelfth aspect of the present invention,
In the invention according to any one of claims 6 to 11, when the self-diagnosis function is performed, the reception level detection signal is detected based on a difference value between the reception signal level and the converted reception signal level of the transmission signal transmitted by the self-diagnosis function. By further providing the received signal level correcting means for determining the correction amount, the accuracy of the correction amount can be improved, and the reliability of the reception level can be further improved.

(M) According to the thirteenth aspect,
13. The transmission signal according to claim 12, wherein the reception signal level correcting means calculates the difference between the reception signal level when the self-diagnosis function is executed and the converted reception signal level of the transmission signal transmitted by the self-diagnosis function. By performing the correction for the level a plurality of times and determining the correction value based on the calculation results of the calculation a plurality of times, it is possible to guarantee the characteristic variation of the reception level over a wide range with high accuracy.

[Brief description of the drawings]

FIG. 1 is a diagram showing an operation principle of a first means.

FIG. 2 is a diagram showing a schematic configuration of a sixth means.

FIG. 3 is a functional block diagram of the wireless communication device according to the first embodiment.

FIG. 4 is a functional block diagram of a wireless communication device according to a second embodiment.

FIG. 5 is a functional block diagram of a wireless communication device according to a third embodiment.

FIG. 6 is a functional block diagram of a wireless communication device according to a fourth embodiment.

FIG. 7 is a functional block diagram of a wireless communication device according to a fifth embodiment.

FIG. 8 is a functional block diagram of a wireless communication device according to a sixth embodiment.

FIG. 9 is a functional block diagram of a wireless communication device according to a seventh embodiment.

FIG. 10 is a functional block diagram of a wireless communication device according to an eighth embodiment.

FIG. 11 is a functional block diagram of a wireless communication device according to a ninth embodiment.

FIG. 12 is a functional block diagram of a wireless communication device according to a tenth embodiment.

FIG. 13 is a functional block diagram of a wireless communication device according to an eleventh embodiment.

FIG. 14 is a functional block diagram of a wireless communication device according to a twelfth embodiment.

FIG. 15 is a functional block diagram of a wireless communication device according to a thirteenth embodiment.

FIG. 16 is a functional block diagram of a wireless communication device according to a fourteenth embodiment.

FIG. 17 is a functional block diagram of a wireless communication device according to a fifteenth embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Distributor, 2 ... Oscillator, 11 ... Receiving part, 12 ... Demodulation part, 21 ... Transmission part, 22 ... Modulation part, 31 ... Transmission antenna, 32 ... Receiving antenna, 40 ... Low-pass filter, 4
1, 51, 52, 54, 55, 57 ... switch, 53 ...
Filter, 56 directional coupler, 58 circulator, 60 reception level correction unit, 61 detection unit, 62 correction unit, 63 correction amount calculation unit, 64 correction value memory, 10
0: receiving unit, 200: transmitting unit, 300: antenna means,
400 ... filter, 401 ... switch,

Claims (13)

[Claims] When the self-diagnosis function is executed, a modulation band of a transmission signal transmitted by the self-diagnosis function is extended beyond a normal band so that a part of transmission power falls within a reception band. Diagnostic method. 2. The reception function self-diagnosis method according to claim 1, wherein the transmission signal transmitted at the time of execution of the self-diagnosis function is supplied to a reception unit via a wired path formed therein. Reception function self-diagnosis method. 3. The reception function self-diagnosis method according to claim 1, wherein a part of a signal radiated from the transmission antenna is transmitted to the reception antenna as a transmission signal to be transmitted during execution of the self-diagnosis function. A self-diagnosis method for a reception function, characterized in that the method is provided by: 4. The receiving function self-diagnosis method according to claim 1, wherein a difference between a reception signal level at the time of executing the self-diagnosis function and a converted reception signal level of a transmission signal transmitted by the self-diagnosis function at that time. A self-diagnosis method for a reception function, wherein a correction amount of a reception signal level is determined based on a value. 5. The receiving function self-diagnosis method according to claim 4, wherein a difference value between a reception signal level at the time of executing the self-diagnosis function and a reduced reception signal level of a transmission signal transmitted by the self-diagnosis function is calculated. Run multiple times for different transmit signal levels,
A self-diagnosis method for a reception function, wherein a correction amount is determined based on a plurality of calculation results. 6. A self-diagnosis device for a reception function of a communication device having a transmission unit and a reception unit, wherein a transmission signal of a normal band whose band is limited is supplied to a transmission unit during communication to execute a self-diagnosis function. A reception function self-diagnosis device comprising transmission signal switching means for supplying a transmission signal whose band has been extended until a part of transmission power enters a reception band to a transmission unit. 7. The receiving function self-diagnosis device according to claim 6, further comprising a wired path for supplying a transmission signal to the receiving unit when executing the self-diagnosis function. 8. A first switching means for supplying a transmission signal to a transmission antenna during communication and supplying a transmission signal to the wired path during execution of the self-diagnosis function. And a second switching unit that supplies a reception signal from a reception antenna to a reception unit during communication and supplies a transmission signal from the wired path to the reception unit during execution of a self-diagnosis function. Reception function self-diagnosis device. 9. The receiving function self-diagnosing device according to claim 7, wherein the transmitting unit outputs only a signal component of a normal band to the transmitting antenna in the transmitting signal output from the transmitting unit;
Switching means for supplying a reception signal from a reception antenna to a reception unit during communication and supplying a transmission signal from the wired path to the reception unit when the self-diagnosis function is performed, . 10. The receiving function self-diagnosis device according to claim 7, performs a closing operation to supply a transmission signal to a transmission antenna during communication, and performs an opening operation to perform transmission signal transmission to a transmission antenna during execution of the self-diagnosis function. A switch that inhibits the supply of a signal, supplies a signal received from the receiving antenna to the receiving unit during communication, and supplies a signal transmitted from the wired path to the receiving unit when the self-diagnosis function is executed, but propagates in the direction of the receiving antenna. A self-diagnosis device for a reception function, comprising: 11. The receiving function self-diagnosis device according to claim 7, wherein a transmitting / receiving antenna is used as an antenna, and a closing operation is performed during communication between the transmitting / receiving antenna and the transmitting unit and the receiving unit. A switch that permits the transmission of a transmission signal or a reception signal and opens when the self-diagnosis function is performed and prohibits the supply of the transmission signal to the transmission / reception common antenna, and a reception signal input from the switch during communication. And the transmission signal from the transmission unit is supplied to the transmission / reception antenna via the switch, and when the self-diagnosis function is performed, the transmission signal from the transmission unit reflected by the switch is received. A self-diagnosis device for a reception function, comprising: a circulator for supplying to the unit. 12. The receiving function self-diagnosis device according to claim 6, wherein, when the self-diagnosing function is performed, the difference between the received signal level and the converted received signal level of the transmission signal transmitted by the self-diagnosing device. The reception function self-diagnosis device further comprising a reception signal level correction unit that determines a correction amount of the reception level detection signal based on the value. 13. The receiving function self-diagnosis device according to claim 12, wherein said reception signal level correcting means includes a reception signal level at the time of executing a self-diagnosis function and a converted reception signal level of a transmission signal transmitted by itself. A self-diagnosis function for a reception function, wherein a calculation of a difference value between the two is performed a plurality of times for different transmission signal levels, and a correction amount is determined based on a result of the plurality of calculations.