JPH1164506A - Ground tacan (tactical air navigation) device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability by receiving a wave stop signal and an external wave signal detected other than the TACAN air navigation signal, transmitting a restore signal after a set time, and stopping the transmission when the frequency of restore signals reaches a set frequency. SOLUTION: A sensor circuit 21 outputs an output signal C to an external wave detecting circuit 22 when an external wave (a) is present. A timer circuit 23 transmits a timer output (g) after a set time to a control part 10 as a reset signal (i) when a wave stop signal (e) is inputted from the control part 10 when the signal (d) judged as external wave by an external wave detecting circuit 22 is inputted. The reset signal (i) is connected to the reset signal of a remote control device 11 by the control part 10, whereby a transmitter-receiver 3 is started. When the external wave (a) is continued, the wave stop signal (e) is outputted again by a monitoring control device 8 to repeat switching and wave stop. A counter circuit 24 transmits a counter suppressing signal (h) to the timer circuit 23 when the reset signal (i) is counted and it reaches a set frequency. Consequently, the wave stop is continued when the following alarm is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terrestrial TV receiver, and more particularly to a return control technique after a transmission / reception device stops due to an interference wave.

[0002]

2. Description of the Related Art Ground takan devices defined in Article 45-12-9 of the Radio Act Radio Equipment Regulations are 962 to 213 MHz.
It is a navigation assistance device that uses the frequency band of z and uses a clear channel system of 1 MHz. Since the operating frequency is guaranteed, interference waves or mixed waves (continuous waves,
No measures against FM waves have been taken.

FIG. 7 shows a block diagram of a prior art ground takan device, and FIG. 8 shows its operation. FIG.
In the above, the interrogation signal of the on-board takan device 12 captured by the antenna 1 is amplified and received by the receiver 5 through the circulator 4.
After being subjected to narrow band detection and decoding processing, the transmitting section 6 gives a fixed response delay time and then codes it, and transmits it from the antenna 1 as a response pulse.

[0004] The monitoring and control of the ground Takan device is performed by the antenna 1
After performing amplification detection and signal processing by the monitor unit 9 of the monitoring and control device 8 of the radiation signal of the antenna 1 from the monitor pickup 2 attached near the monitor, performance characteristics (transmission power, transmission pulse The number (corresponding to the number of decode pulses), the response delay time, the station identification code, and the north and 40-degree azimuth signals are compared with the reference value, and if not, the alarm signal is sent to the control unit 10. Upon receiving the alarm signal, the control unit 10 switches the dual-equipped transmitting / receiving device 3 and transmits the result to the remote control device 11 far away.
Send to After the switching, when the reference value is again out of the reference value by the monitor unit 9, the control unit 10 controls the stop of the wave and transmits the result to the remote control device 11. Remote control device 1
1 is placed in a room where a controller or a mechanic is present, and the ON. O
It has a function of performing FF and switching control and a function of displaying the status of the transmitting / receiving device.

[0005] Due to the recent spread of personal radios and the like, spurious products that do not satisfy the spurious regulations have appeared. ) To decrease. As a result, the supervisory controller 8 determines that the number of decode pulses has decreased due to the failure of the active transceiver, and switches the active transceiver 3 to the standby unit. The standby unit that has started up is operated as the active unit, but this is also stopped by the monitor and control unit 8 because the decoding pulse is similarly reduced due to spurious (see FIG. 8).
reference).

[0006] The switching of the Takan device occurs in about 10 seconds after detecting the abnormality, and when the abnormality again occurs, the wave stops in about 10 seconds. (It takes about several tens of seconds from the detection of an abnormality to the switching and wave stop.) Then, the recovery from the wave stop is performed by restarting after confirming that there is no abnormality in the device by the maintenance staff. .

[0007]

A first problem in the prior art is that the external wave (spurious) of a personal radio or the like, which is a problem, is generally caused by a moving vehicle or an aircraft, and has a fixed time (1 to 1). After 10 minutes), it disappears. Therefore, the abnormality (failure) of the item for monitoring the performance of the normal takan device is that the ground takan device is out of the wave even if the abnormality disappears, though it is different. The reason is that, in the related art, as described above, the monitoring and control device determines that the transmission / reception device has failed, as described above, even in the case of the interruption of the external wave.

[0008] The second problem is that it takes a long time to recover after a stoppage caused by a foreign wave. The reason is that the restoration of the interruption caused by the extraneous wave is also performed by the maintenance staff, similarly to the interruption of the failure. In particular, the interruption during the night or on holidays when there is no mechanic continues until the mechanic goes to work.

It is an object of the present invention to provide a method in which an extraneous wave exists (1 to 1).
(10 minutes) When the wave stops, but when it disappears, it is automatically controlled to return, thereby providing a ground-based tocan device with improved reliability and maintainability of the equipment.

[0010]

According to the present invention, there is provided a sensor circuit responsive to an extraneous wave that lasts for a certain period of time other than a Takan signal, an extraneous wave detection circuit for detecting the presence of an extraneous wave, and a stop signal. And a counter circuit for transmitting a return signal after a set time in response to the external wave detection signal, and a counter circuit for counting the number of return signals, and the count in the counter circuit has reached the set number. In this case, the transmission of the return signal is stopped, whereby a ground gantry is obtained. Further, the counting circuit is reset when the set number of times has not reached within a set time after the detection of the extraneous wave.

An external wave of a personal radio or the like, which is a problem, is generally caused by a moving vehicle or an aircraft, and disappears after a certain period of time (about 1 to 10 minutes). Therefore, it is different from the abnormality of the item for monitoring the performance of the normal Takan device. Therefore, in the present invention, operation is hindered by detecting that there is an external wave and automatically returning the stopped Takan device to the monitoring control device after a certain period of time (for example, one minute) has elapsed. Can be prevented. Note that if automatic recovery (for example, at one-minute intervals) is repeated three times, for example, and does not return to normal, the fourth wave is stopped to ensure flexibility in the actual scene. (The time setting and the number of times of return are variable.) Whether the device is faulty or abnormal due to an external wave, a sensor circuit sensitive to the external wave (spurious) and an external wave detection to detect the presence of the external wave Since the determination is made by the circuit, the start-up processing of the transmission / reception device after the stop of the wave can be performed. After it is determined that there is a foreign wave, the equipment stops, and then the automatic return is repeated.
If the abnormality disappears after a few minutes, the device will be naturally restored, so that the repair work by the maintenance staff is not necessary.

[0012]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the entire configuration, FIG. 2 is a diagram showing the operation thereof, and FIG. 3 is a detailed block diagram of a characteristic portion of the present invention in FIG.

Referring to FIG. 1, according to an embodiment of the present invention, a sensor circuit 21 attached to a receiving section of a transmission / reception device and responsive to an external wave, and an external wave detecting that the external wave (which lasts for a predetermined time) are present. The detection circuit 22 and a stop signal (S / D
Signal) and an extraneous wave detection signal, a timer circuit 23 for setting a time for recovery from now on, a control / output circuit 25 for transmitting a recovery signal from the timer circuit, and a number of times of the recovery signal output from the timer circuit. A counting circuit 24 that counts and stops sending the return signal when the set number of times is reached is added to the conventional technology (FIG. 7).

Next, the operation of the embodiment of the present invention will be described in detail with reference to FIGS. 1 to 3 and FIG. 4 showing operation timing. In the receiving unit 5 of the transmitting and receiving device 3, the number of decoding pulses is reduced due to the mixing of the extraneous wave (spurious) a. Therefore, for example, the automatic gain control voltage (AGC voltage; 5 to 6V) b of the receiving unit is reduced (0 to 2V). ). As described above, the sensor circuit 21 is attached to a portion of the receiving unit 5 where the change is large. The sensor circuit 21 in this case is
It is composed of a reduction filter for an abrupt change in the AGC voltage b, and a comparator for making a comparison judgment with respect to a reference voltage (2 to 4 V) because the voltage changes. The output of the comparator (sensor output c) is set to TTL level LOW when there is an extraneous wave.

The extraneous wave detection circuit 22 measures the duration of the output signal c (TTL level LOW) of the sensor circuit 21. If the duration of the signal exceeds the time for determining the duration of the signal (variable from 1 to 99 ms), the extraneous wave detection circuit 22 measures It is determined to be a wave.

The timer circuit 23 is a logical product (AN) of a wave stop (shutdown; S / D) signal e from the control unit 10 of the monitoring control device 8 and an output signal d from the extraneous wave detection circuit 22.
D) Operates according to conditions. That is, when the S / D signal e is input when it is determined that the signal is an extraneous wave, the timer circuit 23 sets the time (variable from 10 seconds to 16.5 minutes).
Thereafter, the timer output g is output, and this is output to the control / output circuit 25.
To the control unit 10 of the monitoring and control device 8 to return the return signal i
Is sent out.

The return signal i is connected by the control unit 10 in parallel with the return signal of the remote control device 11. As a result, the transmitting / receiving device 3 is started up and enters a normal operation. Foreign wave a
Is maintained, the S / D signal e is output again by the monitoring control device 8, and the switching and the wave stop are repeated. At this time, the counting circuit 24 counts the number of return signals within a fixed time (variable from 0.35 to 1.41 hours) after the detection of the extraneous wave, and reaches a set number (variable from 1 to 16 times). In this case, a count suppression signal h for suppressing the return signal is sent to the timer circuit 23.

As a result, when the next alarm occurs,
The transmission / reception device does not return, and continues the interruption. Subsequent return is performed by the maintenance person pressing the reset circuit 26. If the set number of times has not been reached, the counting circuit 2 is operated by the gate f for a certain time from the timer circuit 23.
4 is reset. Thus, the counting circuit 24
The initial state is set at the timing of the gate f.

Next, regarding the configuration of the characteristic portion of the present invention,
This will be described in detail with reference to FIG.

The sensor circuit 21 of the present invention comprises a filter 31 for reducing the instantaneous change of the AGC voltage, and a comparator 33 for comparing the voltage with a reference voltage 32.

The extraneous wave detection circuit 22 outputs the sensor output signal c
41, an AND circuit 42 for generating a gated 1 kHz clock from the output of the inverter 41 and a 1 kHz clock j, and a digital counter (1/10 * 1/10) 4 operated with the gated 1 kHz clock
Digital switch 44 for setting 3 and 1st place and 10th place
It is composed of

The timer circuit 23 comprises three large constituent circuits (a time gate generation circuit, a recovery time generation circuit, and a 10 s clock generation circuit). The first time gate generation circuit includes an F / F circuit 51 and an AND circuit 52 that generates a gated 10 s clock from the output of the F / F and the 10 s clock.
And a 9-bit counter 53 to generate a gate f of a maximum of 1.41 hours.

The second recovery time generating circuit is provided with the above 1.41.
A logical AND circuit 54 of the time gate f and the S / D signal;
AND circuit 5 for generating a gated 10 s clock from three signals of the s clock, the output of the AND circuit 54, and the count suppression signal h
5, a counter (1/10 * 1/10) 56 using the output of the AND circuit 55 as a clock, a digital switch 58 for setting the first and tenth places, and an F / F set by the output of the counter 56 The circuit 57 generates a return signal of 16.5 minutes at the maximum.

The third 10s clock generation circuit has a frequency of 1 kHz.
Counter 60 (1/10) using z transmitter 59 as a clock
000) and generates a 10s clock.

The control / output circuit 25 is TTL HIGH
Is input, a ground or ground signal i is sent to the control unit 10 of the monitoring and control device 8. As a result, the transmitting / receiving device 3 starts up. The counting circuit 24 includes a 4-bit counter 71 (1 to 16) and an ON. Logical AND (N
(AND) circuit 73 and an F / F circuit 74.

The reset circuit 26 comprises a switch.

Next, the operation of the present invention will be described with reference to FIGS.
This will be described in detail with reference to FIG. The AGC voltage b of the sensor circuit 21 of the present invention is usually 5 to 6 V, and about 0 to 2 V in the case of an external wave, so that the reference voltage 32 is 3 V (input level conversion;
(The voltage varies depending on the element used.) The filter 31 has a time constant of 5 so as not to correspond to the instantaneous conversion.
It is composed of a capacitor and a resistor that can be reduced in size to about ms. The output c of the sensor circuit 21 is set to the TTL level LOW when there is an extraneous wave.

When the TTL level LOW is input to the input of the extraneous wave detection circuit 22, counting is started and set (switch; 0).
5) When 5 ms is reached, a LOW pulse (pulse width 1 m
s) d is output. Digital counter (1/10 *
1/10) is set by the input high. The extraneous wave detection output d (low pulse) is obtained by the F / F
It is held by the circuit 51. The F / F circuit 51 has 9 bi
t counter 53 (maximum 1.41 hours, set value; 1/36
0 ... 1 hour) and stops 1 hour later to generate a 1H gate signal f. The 1H gate signal f is output from the timer circuit 25
To the AND circuit 54 and the counting circuit 24.

The timer circuit 23 takes the logical product (NOT OR) of the TTL level LOW interruption (shutdown; S / D) signal e and the 1H gate signal f (LOW), and when both signals are LOW, Digital counter 56 (1/1
0 * 1/10) starts counting and sets (switch; 06)
At one minute, the low pulse (10 s) is output and the F / F circuit 57 is set. This F / F circuit 57
Is output to the counting circuit 24 and the control / output circuit 25. Also, the return time generation circuit is TTL level LOW
Is reset when one or both of the wave stop (shutdown; S / D) signal e and the 1h gate signal f (LOW) becomes high.

The control / output circuit 25 is TTL HIGH
Is input, a relay or a transistor is activated, and a ground (ground) signal i is sent to the control unit 10 of the monitoring and control device 8. As a result, the transmitting / receiving device 3 starts up. When LOW and HIGH of the timer output 1M signal g are added to the input, 4
The BIT counting circuit 71 counts the number of LOWs, and when the count reaches three times set within one hour, the F / F circuit 7
4 is set, and the count suppression signal h is output to the timer circuit 23. As a result, the device does not return after the fourth switching / suspension, and continues the suspension. Subsequent return is performed by the maintenance staff pressing the reset circuit 26. or,
If the set number of times has not reached three, the 4-bit counter 71 is reset one hour later by the 1H gate f. Thereby, the timer circuit 23 is always set to the initial state.

Next, a second embodiment of the present invention will be described with reference to FIG. 5 showing the configuration and FIG. 6 showing the operation.
The sensor circuit 21 and the extraneous wave detection circuit 22 of FIG. 1 are changed to a broadband detection circuit 81 and a light emitting diode sensor circuit 82. This is an emphasis on extraneous wave detection technology. In FIG. 5, the broadband detection circuit 8
1 detects the output of the IF amplifier. This captures all the energy in the range where the extraneous wave affects the working frequency. The light emitting diode sensor circuit 82 extracts the average energy (level and duration) from the captured energy. Normal: OFF; when an external wave is mixed; O
It is adjusted to be N. FIGS. 6A and 6B show the waveforms of the wide band detection. FIG. 6A shows the waveform at the time of normal operation, and FIG.

[0032]

The first effect of the present invention is that the wave stops during the time when an external wave is present, but when the wave disappears, the wave is automatically restored to shorten the wave stop time and eliminate the return operation by the maintenance staff. It is possible to improve the maintainability and the operation service.

The reason is that the external wave detection circuit determines whether the stoppage is caused by a failure or an external wave, and when the external wave is caused by the external wave, the transmission / reception device can be automatically restarted by the timer circuit.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a diagram illustrating the operation of the present invention.

FIG. 3 is a detailed block diagram of a characteristic portion of the present invention in the configuration shown in the embodiment of FIG. 1;

FIG. 4 is a timing chart showing the operation of the configuration of the detailed block diagram of FIG. 3;

FIG. 5 is a block diagram showing a second embodiment of the present invention.

FIGS. 6A and 6B are diagrams for explaining the operation of the second embodiment of FIG. 5; FIG. 6A is a waveform diagram of wideband detection in a normal state;
(B) is that when an external wave is mixed.

FIG. 7 is a block diagram showing a conventional ground-based takan device.

FIG. 8 is a diagram showing the operation of the conventional ground takan device shown in FIG. 7;

[Description of Signs] 1 Antenna 2 Monitor Pickup 3 Transmitter / Receiver 4 Circulator 5 Receiver 6 Transmitter 7 Controller 8 Supervisory Controller 9 Monitor 10 Controller 11 Remote Controller 21 Sensor Circuit 22 Extraneous Wave Detection Circuit 23 Timer Circuit 24 counting circuit 25 control / output circuit 26 reset circuit

Claims (5)

[Claims] 1. A sensor circuit for detecting an extraneous wave that lasts for a certain period of time other than a Takan signal, an extraneous wave detection circuit for receiving the output of the sensor circuit and detecting the presence of the extraneous wave, a stop signal and an extraneous wave detection A timer circuit for generating a recovery signal of a wave stop after a set time after receiving the signal, and a counting circuit for counting the number of times of the recovery signal, and when the generation of the recovery signal reaches the set number of times. An on-ground takan device for inhibiting generation of a return signal. 2. The ground takan device according to claim 1, wherein the counting circuit is reset when a set number of times is not reached within a set time after the detection of the extraneous wave. 3. An extraneous wave detecting means for detecting an extraneous wave which lasts for a first predetermined time or more other than a Takan signal, and receiving an output of the extraneous wave detecting means when the transmission of the response signal is stopped.
A return signal generating means for generating a return signal for returning the response signal after a predetermined time, and stopping the generation of the return signal when the return signal is output a predetermined number of times within the third predetermined time. And a stopping means for stopping the operation. 4. The ground contact device according to claim 3, wherein the stop means is reset when the return signal does not reach the predetermined number of times and the third predetermined time has elapsed. 5. The first predetermined time is 1 to 99 milliseconds, the second predetermined time is 10 seconds to 16.5 minutes, and the third predetermined time is
5. The ground takan device according to claim 4, wherein the predetermined time is 1 hour to 1.41 hours.