JPH03242032A - Radio communication equipment - Google Patents

Abstract

PURPOSE:To discriminate a fault of an active and a standby receiver accurately by discriminating a reception section of the active and the standby receiver to be normal when an output level difference of a noise squelch corresponds to the difference from distribution loss of a distributer. CONSTITUTION:A radio wave signal received by an antenna 1 is unequally distributed, that is, into a signal with less distribution loss and a signal with much distribution loss, the distribution signals are received by an active reception section 4 and a standby reception section 5 and the signals with different distribution loss are selected and outputted to the active or the standby reception section 4 or 5. Outputs of noise squelch from the reception sections 4, 5 are compared to discriminate the fault of the reception section by the result of comparison. Thus, the fault of the active reception section and the standby reception section is discriminated accurately.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention includes a working transmitting device and a receiving device and a backup transmitting device and a receiving device, and detects a failure in the working transmitting device and receiving device. , relates to a wireless communication device that automatically switches to a backup transmitter or receiver.

[Conventional example] Conventionally, this type of wireless communication device compares the detected value of the transmission output with a reference value, and based on the comparison result, determines whether the current transmitter is malfunctioning or switches to a backup transmitter, for example. However, in order to detect the reception state, various methods shown below are used, for example.

(1) Reference signal generator (SG; signal ge
nerator) and the received signal, directly test the receiving sensitivity, determine whether it is in an abnormal state (that is, a failure), and transfer the backup reception from the current receiving device. Switch to device.

(2) Distribute the received signal to the current receiving device and backup receiving device a, and compare the noise squelch outputs from these receiving devices, for example, even though there is a noise squelch output from the backup receiving device, If there is no noise squelch output from the current receiving device, it is determined that the current receiving device is malfunctioning, and the system switches to the backup receiving device.

[Problem to be solved by the invention] However, the above! ! The method of detecting the reception state in a line communication device has the following problems.

When method (1) is adopted, it is necessary to perform an inspection operation at predetermined time intervals (every determined time) to detect a failure in the receiving device. This is because accurate judgment cannot be made, and there is also a problem with the reliability of the reference signal generator that generates the reference signal, so that accurate judgment may not be possible.

In addition, when method (2) is adopted, since the receiving parts of the working and standby receiving devices change depending on their respective squelch volumes, it is difficult to adjust the receiving sensitivities of these receiving devices to be almost the same. Moreover, during the squelch and ga, the sensitivities of these receiving devices vary, making it difficult to accurately determine failures.

The present invention has been made in view of the above problems, and its purpose is to provide a wireless communication device that can accurately determine failures in working and standby receiving devices.

[! Means for Solving Problem 1] In order to achieve the above object, the present invention provides a method for transmitting and receiving signals via an antenna, using a working first transmitting means and a first receiving means, and a standby first receiving means. 2. In the radio communication device, the wireless communication device includes a first switching means for switching between transmission and reception, and a second switching means for switching outputs of the first and second transmission means. means, distribution means for distributing signals from radio waves received by the antenna with different distribution losses, and third switching means for switching and outputting the signals with the different distribution losses to the first and second receiving means, respectively. , comprising comparison means for comparing the squelch outputs from the first and second reception means, and determination means for determining failure of the first and second reception means according to the comparison result, When the second receiving means receives a signal, a malfunction of the first and second receiving means is determined based on a comparison result of squelch outputs from the first and second receiving means.

The gist is that the third switching means is switched based on this judgment, and the first or second receiving means is automatically switched.

Further, the wireless communication device of the present invention includes first and second squelch variable means that interlock and vary the squelch sensitivities of the first and second receiving means substantially equally; and fourth switching means for switching and outputting the variable signal of the variable means to the first and second receiving means.

[Function] Since the configuration is as shown in L, when the wireless communication device is in the receiving state, the first relay circuit (switching means) is switched to the receiving side, and the signal from the radio waves received by the antenna is switched to the first relay circuit. It is output to a distributor via a relay circuit and distributed. Since the distributors have different losses, the signal is divided into a signal with less distribution loss and a signal with more distribution loss, and the signal with less distribution loss is sent to the current receiver ( A signal with a large distribution loss is outputted to a spare receiving section (second receiving means) via a third relay circuit (switching means). Then, the noise squelch output levels from the current and T[ receiving sections are compared in a comparing section (comparing means), and a failure of the receiving section is determined based on the comparison result.

Therefore, if a comparison result is obtained that there is a noise squelch output from the working and standby receivers, that is, if the difference in the output level of those noise squelches corresponds to the distribution loss difference between the and the spare receiving section is determined to be normal.

However, if the comparison result is that there is no noise squelch output from the current receiving section, that is, if the difference in the output level of those noise squelches does not correspond to the 142 distribution loss difference, then the current receiving section It is determined that there is a failure. Then, the output of the signal with less distribution loss and the signal with more distribution loss is switched in the third relay circuit, and the signal with less distribution loss is output to the backup receiving section, so that the reception of the wireless communication device is switched to backup. can be switched to the receiving section.

Note that by switching between a signal with a small one-way distribution loss and a signal with a large distribution loss in the third relay circuit, it is possible to determine a failure in the spare receiving section in the same manner as described above.

Furthermore, since the squelch volumes for varying the squelch sensitivities of the working and standby receiving sections are linked together, the squelch sensitivities of these receiving sections can be varied to the same degree, and this can be done easily. That is, the working and standby receiving sections are initially adjusted to have the same level of sensitivity.

Therefore, even if the squelch sensitivities of the working and standby receiving units are varied, it is possible to accurately determine the failure of the working and standby receiving units.

In other words, the squelch sensitivity of the working and standby receivers i=
This is because the r change is performed to the same degree, and there is no variation in the sensitivity of the receiving sections.

[Implementation example] Embodiments of the present invention will be described below based on the drawings.

In the figure, the wireless communication device includes a working transmitting section (first transmitting means) 2 and a backup transmitting section (second transmitting means) 3 for transmitting signals such as voice via an antenna 1. A working receiving section (first receiving means) 4 and a backup receiving section (
5, a first relay circuit (switching means) 6 that is switched during transmission and reception, and a second relay that switches between the output of the active transmitter 2 and the output of the standby transmitter 3 during transmission. a circuit (switching means) 7, a dew condenser 8 for transmitting the transmission signal via the second relay circuit 7 via the antenna 1, and a 4-channel switch via the t-th relay circuit 6.
a third relay circuit 10 that switches and outputs the signals of these different distribution losses to the working receiving section 4 or the backup receiving section 5, and the above-mentioned working receiving section. Squelch sensitivity of section 4 and spare receiving section 5! II! First and second squelch volumes (squelch variable means) 11.1 are linked to each other in order to vary the IL and the squelch sensitivities to approximately the same degree.
2, and a fourth relay circuit w! that outputs these variable signals to the working receiving section 4 and the standby receiving section 5. t (switching means) 1
3, detects the transmission output from the transmission signal passing through the dew condensation section 8, and detects the transmission output from the transmission signal passing through the dew condensation section 8, and also detects the transmission output from the transmission signal passing through the dew condensation section 8, and the current reception section 4 and the backup reception section 5.
The noise squelch output from Third and fourth relay circuits 10.1
1 and switches between the active transmitting section 4 and the standby receiving section 5.

The failure detection unit 14 includes a transmission power detection unit 14a that detects transmission output based on a portion of the transmission power from the dew condensation unit 8, and compares noise squelch outputs from the working reception unit 4 and the backup reception unit 5. and a comparison section 14b.

Based on the above transmission output detection results and comparison results, it is determined whether there is a failure in the transmitter or receiver, and based on this determination result, the second
to drive the fourth relay circuit 7.10.11, and
A failure determination section 14C that outputs an alarm signal is provided.

In addition, the above-mentioned first to fourth relays @l! 6.7゜io,
ii is a high frequency relay, and the first and second J relay circuits wr6 and wr7 are configured as one switch 7a. Moreover, the third relay circuit IO has four switches lOa,
It has a configuration of IOb, 10c, and 1Ocl.

A signal with a small distribution loss via the distributor 9 is output to the working or standby receiving sections 4 and 5, and a signal with a large distribution loss is output to the standby or working receiving section 5.4. . Further, the fourth relay circuit 11 is configured with two switches 13a and 13b, and the squelch +1'r signal from the ↓th squelch volume 11 is transmitted to the current or T-equipment receiver 4.5 or both. The variable squelch signal generated by the second squelch volume 12 is output to the working or standby receiving sections 4, 5, or both.

Next, a failure detection operation of the focal line communication device having the above configuration will be explained.

First, when receiving a signal by radio waves received by an antennae in a wireless communication device, switches 6a, 10a, f
ob, 10c, 10d, 13a, 13
b are respectively switched to terminal a. That is, a radio wave signal received by the antenna 1 is input to the distributor 9 via the switch 6a, and is distributed to a line 9a with less distribution loss and a line 9b with more distribution loss. Also, a signal with less distribution loss is input to the current receiving section 4 via the switch 10a and the fob, and a signal with more distribution loss is input to the switch lOc,
The signal is input to the standby receiving section 5 via 10c+. Furthermore, the first and second squelch volumes 11.12
Squelch variable No. 09 corresponding to the settings of
The current and backup receiving sections 4,
5 is the squelch sensitivity corresponding to the squelch variable signal.
'IIi.

Note that a fixed resistor 12a connected to the second squelch volume 12 is used to adjust the squelch release level, so that when the squelch volume 11.12 is released, the sensitivity of the auxiliary receiver 5 becomes deeper. . That is,
When setting the first and second squelch volumes 11 and 12, adjustments can be made so that the noise squelch output is first output from the current receiving section 4.

Then, on the current receiving section 4 side, since a signal with less distribution loss is received, the received signal level becomes high, and accordingly, the output level of the noise squelch also becomes high. on the other hand,
On the side of the backup receiver 5, on the other hand, a signal with a large distribution loss is received, so the received signal level is low and the output level of the noise squelch is low. At this time, if the distribution loss difference of the distributor 9 is set to, for example, 10 dB, the reduction in sensitivity of the backup receiving section 5 will be 10 dB or less compared to the working receiving section 4, and the output level of their noise squelches will decrease. There is also a difference corresponding to 1 OdB.

At this time, it is assumed that the noise squelch output from the active receiving section 4 has disappeared or its output level has become lower than the noise squelch output level from the backup receiving section 5. In this case, it is assumed that the spare receiving section 5 is in a normal state. Then, as a result of the comparison by the comparator 14b, the difference in the output levels of these noise squelches does not correspond to the distribution loss difference of 10 dB, that is, the output level of the noise squelch from the backup receiver 5 is high. The failure determination unit 14c determines that a failure has occurred in the currently used receiving unit 4. Depending on this determination, switches 10a, lOb, lOc, 10d
, 13a.

13b is switched to the terminal, and the receiving function is automatically switched to the backup receiving section 5.

Note that the third relay circuit IO outputs a signal with less distribution loss to the backup receiver 5 and outputs a signal with more 1-distribution loss to the active receiver 4, so that the backup receiver can be connected to the backup receiver in the same manner as described above. 5 failure judgments can be made.

In addition, the switches lOa, lOb, IOc,
lOd, 13a.

13b is switched to the terminal, that is, the signal with less distribution loss is output to the backup receiver 5, and the signal with more distribution loss is output to the active receiver 4.
failure determination is possible. In other words, if there is no noise squelch output from the backup receiver 5 or its output level is lower than normal, the difference in noise squelch output levels from the working and backup receivers 4 and 5 corresponds to the distribution loss difference, as described above. Therefore, it is determined that there is a failure in the spare receiving section 5. In this case, each switch of the third and fourth relay circuits 10.13 is opened, and the wireless communication device becomes unable to receive data.

In this way, the radio wave signal received by the antenna 1 is divided into a signal with less distribution loss and a signal with more distribution loss, and these are output to the working receiver 4 and the backup receiver 5. Since there is a difference in the output level of the noise squelch from the receiving sections 4.5, it is possible to accurately determine the failure of the receiving sections 4, 5. Moreover, since the signal with less distribution loss and the signal with more distribution loss can be switched by the third relay circuit 10 and output to the working receiving section 4 and the backup receiving section 5, the working receiving section 4 In addition, it is possible to accurately determine the failure of the spare receiving section 5.

In addition, when adjusting the squelch sensitivity of the working receiver 4 and the backup receiver 5, the squelch sensitivity of the receivers 4 and 5 is can be changed to the same degree, making squelch adjustment easy. Furthermore, as described above, the squelch sensitivities of the working receiving section 4 and the backup receiving section 5 are set in advance. Furthermore, when adjusting the squelch sensitivity, there is no difference between the 419g of the squelch sensitivity, that is, the working and standby receiving sections 4°5
Since there is no variation in sensitivity, the above-mentioned failure determination can be performed accurately.

[Effects of the Invention j As explained above, according to the wireless communication device of the present invention,
The radio signal received by the antenna is distributed unevenly, that is, it is divided into a signal with less distribution loss and a signal with more distribution loss,
These distributed signals are received by the working or standby receiving unit, and the signals with different distribution losses are switched and output to the working or standby receiving unit, and the noise squelch outputs from these receiving units are compared. However, since the failure of the receiving section is determined based on the comparison result, the difference in noise squelch output level between the working and standby receiving sections becomes a value corresponding to the distribution loss difference of the distributor. Even if there is some variation in sensitivity between the receiving section and the spare receiving section, it is possible to accurately determine the failure of these receiving sections.

In addition, p of this invention! According to the IiA communication device, the sensitivity adjustment squelch volumes of the active and standby receivers are driven in conjunction with each other, so there is less variation when adjusting the sensitivity of the receivers, and the failure determination described above is more accurate. , and the sensitivity can be easily adjusted.

[Brief explanation of drawings]

The drawing is a schematic block diagram of a wireless communication device showing an embodiment of the present invention. In the figure, 51 is an antenna, 2 is a working transmitting section (first transmitting means), 3 is a backup transmitting section (second transmitting means), 4 is a working receiving section (first receiving means), and 5 is a working transmitting section (first transmitting means). Spare receiver (second
(receiving means), 6 is a first relay circuit (switching means), 6
a, 7a, 10a, 10b, 10c. 10d, 13a, 13b are switches (high frequency relays), 7 is a second relay circuit (switching means), 8 is a connecting section, 9 is a distributor, 10 is a third relay circuit (switching means)
, 11 is a first squelch volume (squelch variable means). 12 is a second squelch volume (squelch variable means)
, 12a is a fixed resistor, 13 is a fourth relay circuit (fourth variable squelch means), 14 is a failure detection section, 14b is a comparison section, and 14c is a failure determination section.

Claims (2)

[Claims] (1) When transmitting and receiving signals via an antenna,
The active first transmitting and first receiving means, and the backup second means.
A wireless communication device comprising: a first switching means for switching between the transmission and reception; and a second switching means for switching between the outputs of the first and second transmission means.
switching means; distribution means for distributing signals from radio waves received by the antenna with different distribution losses; and third switching for switching and outputting signals with different distribution losses to the first and second receiving means, respectively. means, comparing means for comparing squelch outputs from the first and second receiving means, and determining means for determining failure of the first and second receiving means according to the comparison result, When receiving signals in the first and second receiving means,
Based on the comparison result of the squelch outputs from the first and second receiving means, it is determined whether the first and second receiving means are malfunctioning, and based on the determination, the third switching means is switched to A wireless communication device characterized in that the second receiving means is automatically switched. (2) first and second variable squelch means that interlock and vary the squelch sensitivities of the first and second receiving means substantially equally; and a variable signal of the first and second variable squelch means. 2. The wireless communication device according to claim 1, further comprising a fourth switching means for switching between the first and second receiving means and outputting the output.