JPH05669B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is an ILS (Instrument Landing System)
The present invention relates to a method for monitoring ground equipment, and in particular to an automated technique for checking the operation of a monitoring device that determines the quality of a transmitted signal.

(Prior Art) The ILS ground system is described in detail in the publication "Aviation Electronics Equipment" (edited by Minoru Okada, published by Nikkan Kogyo Shimbun), etc. It emits radio waves to direct the course at an elevation angle of approximately 3° on the center line.

Therefore, in view of its importance, this ILS ground equipment is equipped with a function that constantly monitors whether the transmitted signal satisfies the specified values of each main parameter determined by the system. When an abnormality is detected, the system switches to a backup transmission system (if the transmission system is dual equipped) or shuts down the system itself to prevent abnormal signals from being transmitted. In the unlikely event that an abnormality occurs in the monitor device and an abnormality in the transmitted signal cannot be detected, in other words, the monitor device determines that the transmitted signal is normal even though the transmitted signal is abnormal due to a malfunction of the monitor device, etc. If this happens, it could endanger the aircraft, so we made it possible to check the operation of the monitor equipment (hereinafter referred to as ``monitor verification''), thereby ensuring system reliability (hereinafter referred to as ``system integration''). We are making it possible to secure the "retention").

FIG. 2 shows an example of a conventional monitoring system.

In Fig. 2, 1 is a transmitter of an ILS ground device not shown, 2' is a controller, 11 and 12 are monitor sensors,
21 and 22 are monitor signal generators, 31' and 32' are changeover switches, and 41 and 42 are monitor devices.

The monitor sensors 11 and 12 detect transmission signals sent from the transmitter 1, and various detection methods are known. The detected transmission signals are sent to the corresponding monitor devices 41 and 42 via the corresponding changeover switches 31' and 32'.

The monitor signal generators 21 and 22 generate monitor signals for monitor verification, and send them to the corresponding monitor devices 41 and 42 via the corresponding changeover switches 31' and 32'.

The changeover switches 31' and 32' are manually set by maintenance personnel, and during normal operation, the output terminals of the monitor sensors 11 and 12 are connected to the input terminals of the corresponding monitor devices 41 and 42, as shown in the figure. To,
At the time of monitor verification, the monitor signal generator 21,
Monitor devices 41 and 4 corresponding to the output terminals 22 and 4
The two input terminals are connected to each other. this is,
This is based on the fact that the transmission signal of ILS ground equipment is a continuous wave, and monitoring and monitor verification cannot be performed at the same time.

That is, in the conventional monitoring system, during normal operation, the changeover switches 31' and 32' are set so that the signals from the monitor sensors 11 and 12 are input to the monitor devices 41 and 42, respectively, and the signals from the monitor sensors 11 and 12 are input to the monitor devices 41 and 42, respectively. The quality determination results of the monitor devices 41 and 42 that monitor the signals are output to the controller 2'. Then, the controller 2' turns off the transmitter 1 and stops transmission when the results of the quality determination of the monitor devices 41 and 42 are both "fail". On the other hand, during maintenance performed at predetermined intervals, maintenance personnel temporarily stop transmission (this means stopping the system, but it may also be operated with conditions), and the monitor signal generator 21, 22
The connection of the changeover switches 31' and 32' is changed so that signals from the monitors 41 and 42 are inputted to the corresponding monitors 41 and 42, respectively. Then, the monitor device 41,
The same 42 performs a predetermined judgment operation on the monitor signal and outputs the judgment result to the controller 2'.
The controller 2' can perform monitor verification based on the content of the determination result.

Here, ILS when dual monitor devices are used
The system integrity I of ground equipment is expressed by the following formula (1)
Calculated by

I=1-R...(1) Here, R is the risk rate, which is given by the following equation (2).

R = 1/6λ _T λ _CC t ² + 1/6λ _T λ _M t ² ...(2) I: System integrity λ _T : Probability that the transmitter transmits an abnormal signal λ _CC : Transmitter transmits an abnormal signal λ _M : Probability that the monitor cannot detect an abnormality in the transmitted signal t : Monitor verification time interval Now, assume λ _T , λ _CC , λ _M , and t as follows, respectively. Then, λ _T = 6 x 10 ^-6 λ _CC = 0.07 x 10 ^-6 λ _M = 2.5 x 10 ^-6 t = 7 days = 168 hours The risk rate is R = 7.25 x 10 - ⁸ , and the system integrity is I≒1-7.25×10 ^-8 .

(Problems to be Solved by the Invention) However, in the conventional monitoring method described above, there is a problem in that service is degraded because the operation is temporarily stopped and monitor verification is performed.

Furthermore, since the monitor verification is performed manually by maintenance personnel, the monitor verification cycle must be long, making it difficult to improve system integrity. That is, in order to improve system integrity, it is necessary to shorten the monitor verification cycle, which poses the problem of increasing the load on maintenance personnel.

The present invention was made in view of the above problems, and
The objective is to provide a method for monitoring ILS ground equipment that can improve system integrity without degrading service or increasing the burden on maintenance personnel.

(Means for Solving the Problems) In order to achieve the above object, the ILS ground equipment monitoring system of the present invention has the following configuration.

That is, the ILS ground equipment monitoring method of the present invention is as follows:
N (N is a natural number) monitor sensors that detect the transmitted signals of the ILS ground equipment; N monitor devices that determine the quality of the detected transmitted signals; N monitor signal generators that generate monitor signals; one of the output terminals of the i-th monitor sensor and the i-th monitor signal generator is selected according to the switching command; N connected to the input end of the monitor device
One switch among the N switches selects the output terminal of the corresponding monitor signal generator, and the remaining switches select the output terminals of the corresponding monitor sensor, and this combination is sequentially changed. and a control means for generating the switching command to be performed.

(Operation) Next, the operation of the ILS ground equipment monitoring system of the present invention configured as described above will be explained.

For example, if N=3, three monitor devices A and B
and the same C, monitor verification is performed for each of these three machines.
Rather than doing this for each unit at a time, one unit receives the monitor signal input, and the remaining two units receive the detected transmission signal input, and this combination is changed sequentially.
Monitor device A in parallel while monitoring the transmitted signal
→ Same B → Same C → Same A, etc. The monitor verification can be performed one by one in sequence.

In this way, according to the ILS ground equipment monitoring method of the present invention, monitor verification can be automatically performed in parallel without interrupting the original monitoring operation, so that there is no deterioration in service. Of course, this has the effect of improving system integrity without requiring the help of maintenance personnel.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a monitoring system for ILS ground equipment according to an embodiment of the present invention. Components that are the same as those in FIG. 2 are designated by the same reference numerals, and their explanations will be omitted.

The monitor system of the present invention adds one system of monitor sensor 13, monitor signal generator, and monitor device 43 to the conventional system, and the changeover switches 31, 32, and 33 of each system are connected to the controller 2.
It is designed to operate in response to a switching command.

That is, the control means provided in the controller 2 controls one of the three monitor devices 41, 42, and 43.
One unit receives the monitor signal input, and the remaining two units receive the detected transmission signal input, and generate a switching command so that this combination is changed sequentially, and send it to the changeover switches 31, 32, and 33. .

As a result, for example, signals from the monitor sensors 11 and 12 are first transmitted to the monitor devices 41 and 4, respectively.
The changeover switches 31 and 32 are set so that the signal from the monitor signal generator 23 is input to the monitor device 43 to monitor the transmitted signal, and at the same time the changeover switch 33 is set so that the signal from the monitor signal generator 23 is input to the monitor device 43. Do a huai.

Monitor verification is normally performed in several seconds to several tens of seconds, but once the monitor verification of the monitor device 43 is completed, the signals from the monitor sensors 12 and 13 are input to the monitor devices 42 and 43, respectively. a changeover switch 31 so that the signal from the monitor signal generator 21 is input to the monitor device 41;
Change the settings of 32 and 33 and monitor device 41.
Perform monitor verification. Similarly, when the monitor verification is completed, the changeover switches 31 to 33 are
The settings of monitor devices 41 to 43 are changed while monitoring the transmitted signal as usual with the dual monitor devices.
All monitor verifications can be performed.

Here, the ILS that adopts the monitoring method of this example
The danger rate R of the ground equipment is calculated by the following equation (3).

R = 1/6λ _T λ _CC t ² ₁ + 1/6λ _T λ _M t ² ₂ ...(2) Here, t ₁ : Normal maintenance interval time to check the operation of the transmitter and controller t ₂ : Monitor Verification time interval Now, if t ₁ is set as before, t ₁ = 7 days = 168 hours, and the monitor verification time per monitor device is 5 minutes, then t ₂ = 15 minutes = 0.25 hours. The risk rate R according to the method of this embodiment is R=1.98×10 ⁻⁹ and the system integrity I is I≒1−1.98×10 ⁻⁹ . In other words, compared to the conventional method shown in FIG. 2, the method of the present invention reduces the risk factor by one order of magnitude and improves system integrity.

As is clear from the above description, the system of the present invention has a configuration in which one system is added to the conventional system shown in FIG. In the case of a single monitor system, one system is added to this, one monitor device monitors the transmitted signal, the other monitor verify
Needless to say, this process will be repeated alternately.

(Effects of the Invention) As explained above, according to the ILS ground equipment monitoring method of the present invention, monitor verification can be automatically performed in parallel with the original monitoring operation without interrupting it. Not only does this not cause any deterioration, but it also has the effect of improving system integrity without requiring the help of maintenance personnel.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a monitoring system for an ILS ground device according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional system. 1...Transmitter, 2, 2'...Controller, 11-1
3... Monitor sensor, 21-23... Monitor signal generator, 31-33, 31', 32'... Changeover switch, 41-43... Monitor device.

Claims (1)

[Claims] 1 N (N is a natural number) monitor sensors that detect the transmission signals of the ILS ground equipment; N monitor devices that determine the quality of the detected transmission signals; and to confirm the suitability of the determination operation of the monitor devices. N monitor signal generators generating monitor signals;
N switches that select one of the output ends of the i-th monitor sensor and the i-th monitor signal generator according to a switching command and connect it to the input end of the i-th monitor device; one of the switches
one switch selects the output terminal of the corresponding monitor signal generator, and the remaining switches select the output terminals of the corresponding monitor sensor, and this combination is sequentially changed.Control means for generating the switching command. A monitoring method for ILS ground equipment characterized by comprising;