JPH01127985A - Monitoring system for ils ground device - Google Patents

Monitoring system for ils ground device

Info

Publication number
JPH01127985A
JPH01127985A JP62286230A JP28623087A JPH01127985A JP H01127985 A JPH01127985 A JP H01127985A JP 62286230 A JP62286230 A JP 62286230A JP 28623087 A JP28623087 A JP 28623087A JP H01127985 A JPH01127985 A JP H01127985A
Authority
JP
Japan
Prior art keywords
monitor
signal
verification
switches
ils
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP62286230A
Other languages
Japanese (ja)
Other versions
JPH05669B2 (en
Inventor
Takashi Nishimura
貴志 西村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP62286230A priority Critical patent/JPH01127985A/en
Publication of JPH01127985A publication Critical patent/JPH01127985A/en
Publication of JPH05669B2 publication Critical patent/JPH05669B2/ja
Granted legal-status Critical Current

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Abstract

PURPOSE:To improve system integrity by providing N pieces of monitor sensors, and a switch etc., for connecting one of each output terminal of the i-th monitor sensor and a monitor signal generator to an input terminal in accordance with a switching command. CONSTITUTION:A control means provided on a controller 2 is constituted so that one set among three sets of monitor device 41, 42 and 43 receives an input of a monitor signal, the remaining two sets receives an input of a detected transmitting signal, and also, a switching command is generated so that this combination is changed successively, and it is given to changeover switches 31, 32 and 33. As a result, for instance, first of all, the switches 31, 32 are set so that signals from monitor sensors 11, 12 are inputted to the devices 41, 42 and monitoring of the transmitting signal is executed, and simultaneously, the switch 33 is set so that a signal from a monitor signal generator 23 is inputted to the device 43, and a monitor verification is executed. When the monitor verification is completed, setting of the switches 31-33 is changed successively, and the monitor verification of all the derives 41-43 is executed. In such a way, the system integrity can be improved without causing a drop of the service, etc.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明はI L S (Instrument Lan
ding System)地上装置のモニタ方式に係り
、特に送信信号の良否判定を行うモニタ装置の動作確認
の自動化技術に関する。
DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is applicable to ILS (Instrument Lan)
The present invention relates to a monitoring system for 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.

(従来の技術) ILS地上装置は、例えば刊行物「航空電子装置」 (
岡田実編、日刊工業新聞社発行)等に詳記されているが
、空港に進入着陸しようとしている航空機に、滑走路中
心線上、仰角的3°のコースを指示するための電波を発
射するものである。
(Prior Art) ILS ground equipment is described, for example, in the publication "Avionics Equipment" (
(edited by Minoru Okada, published by Nikkan Kogyo Shimbun), etc., is a device that emits radio waves to instruct aircraft approaching and landing at an airport to take a course at an angle of 3° above the runway centerline. It is.

そこで、このILS地上装置には、その重要性に鑑み、
送信信号がシステムで定才る各主要パラメータの規定値
を満足しているか否かを常にモニタする機能が設けられ
、このモニタ装置で送信信号の異常を検出した場合、予
備の送信系へ切り換えるく送信系が2重装備の場合)あ
るいはシステムそのものをシャットダウンして異常信号
が送信されてしまうのを防止している。そして、万一モ
ニタ装置に異常が発生し、送信信号の異常を検出できな
かった場合、すなわち、モニタ装置の故障等により送信
信号が異常であるにもかかわらすモニタ装置が正常と判
断するようなことがあると航空機を危険にさらすことに
なるので、モニタ装置の動作確認(以下、これを「モニ
タベリファイ」という)も行えるようにし、以てシステ
ムの確実性(以下、これを[システムインテグリテイ」
という)を確保できるようにしている。
Therefore, considering the importance of this ILS ground equipment,
A function is provided to constantly monitor whether the transmitted signal satisfies the specified values of each major parameter determined by the system, and if this monitoring device detects an abnormality in the transmitted signal, it will switch to a backup transmission system. (If the transmission system is dual equipped) or the system itself is shut down 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, that is, 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 integrity''). ”
).

第2図は従来のモニタ方式の一例を示す。FIG. 2 shows an example of a conventional monitoring system.

第2図において、1は図外のILS地上装置の送信機、
2′は制御器、11.12はモニタセンサ、21.22
はモニタ信号発生器、31’、32’は切換スイッチ、
41.42はモニタ装置である。
In Figure 2, 1 is the transmitter of the ILS ground equipment not shown;
2' is the controller, 11.12 is the monitor sensor, 21.22
is a monitor signal generator, 31' and 32' are selector switches,
41 and 42 are monitor devices.

モニタセンサ11.同12は送信機1から送出される送
信信号を検出するもので、種々の検出方式が知られてい
る。検出した送信信号は対応する切換スイッチ31′、
同32′を介して対応するモニタ装置41.同42へ送
出される。
Monitor sensor 11. The transmitter 12 detects a transmission signal sent from the transmitter 1, and various detection methods are known. The detected transmission signal is sent to the corresponding changeover switch 31',
The corresponding monitor device 41. It is sent to 42.

モニタ信号発生器21.同22はモニタベリファイを行
うためのモニタ信号を発生し、それを対応する切換スイ
ッチ31′、同32′を介して対応するモニタ装置41
.同42へ送出する。
Monitor signal generator 21. The same 22 generates a monitor signal for performing monitor verification, and sends it to the corresponding monitor device 41 via the corresponding changeover switch 31' and 32'.
.. Send to 42.

切換スイッチ31′、同32′は保守要員が手動で切換
設定するものであって、通常の運用時には図示する如く
モニタセンサ11.同12の出力端が対応するモニタ装
置41.同42の入力端に、モニタベリファイ時にはモ
ニタ信号発生器21゜同22の出力端が対応するモニタ
装置41.同42の入力端にそれぞれ接続設定される。
The changeover switches 31' and 32' are manually set by maintenance personnel, and during normal operation, the monitor sensor 11. Monitor device 41 to which the 12 output ends correspond. The input terminal of the monitor 42 is connected to the monitor signal generator 21 during monitor verification, and the output terminal of the monitor 22 corresponds to the monitor device 41. Connections are made to the 42 input terminals of the same.

これは、ILS地上装置の送信信号が連続波であり、モ
ニタとモニタベリファイを同時に行えないことに基づく
This is based on the fact that the transmission signal of the ILS ground equipment is a continuous wave, and monitoring and monitor verification cannot be performed at the same time.

即ち、従来のモニタ方式は、通常の運用時ではモニタセ
ンサ11.同12からの信号がそれぞれモニタ装置41
.同42に入力されるよう切換スイッチ31′、同32
′がセットされており、送信信号をモニタするモニタ装
置41.同42の良否判定結果が制御器2′へ出力され
る。そして、制御器2′では、モニタ装置41.同42
の良否判定結果が共に「否」のとき送信miをオフにし
て送信を停止させる。一方、所定期間ごとに行う保守時
には、保守要員が一旦送信を停止させ(システムを停止
させることであるが、条件付運用とする場合もある)、
モニタ信号発生器21.同22からの信号が対応するモ
ニタ装置41.同42へ入力されるように切換スイッチ
31′、同32′の接続切り換えを行う。すると、モニ
タ装置41゜同42ではモニタ信号について所定の判定
動作を行い、その判定結果を制御器2′に出力するので
、制御器2′は判定結果の内容からモニタベリファイを
行うことができる。
That is, in the conventional monitor system, during normal operation, the monitor sensor 11. The signals from the same 12 are sent to the monitor device 41.
.. Selector switch 31' so that the input is input to the same 42,
' is set, and the monitor device 41. which monitors the transmitted signal. The results of the 42 pass/fail judgments are output to the controller 2'. In the controller 2', a monitor device 41. Same 42
When both of the pass/fail judgment results are "fail", the transmission mi is turned off to stop the transmission. On the other hand, during maintenance performed at predetermined intervals, maintenance personnel temporarily stop transmission (this means stopping the system, but there are also cases where it is a conditional operation).
Monitor signal generator 21. Monitor device 41 to which the signal from 22 corresponds. The connection of the changeover switches 31' and 32' is changed so that the signal is input to the switch 42. Then, the monitor devices 41 and 42 perform a predetermined judgment operation on the monitor signal and output the judgment result to the controller 2', so that the controller 2' can perform monitor verification based on the contents of the judgment result.

ここで、モニタ装置を2重装置した場合のILS地上装
置のシステムインテグリテイ■は次の式(1)により計
算される。
Here, the system integrity (2) of the ILS ground equipment when the monitor equipment is dually installed is calculated by the following equation (1).

I = 1− R−−−−一・−・・−・−(1)ここ
で、Rは危険率であり、次の式(2)で与えられる。
I = 1- R----1・-・・-・-(1) Here, R is the risk rate, which is given by the following equation (2).

R= 1−λγλ。。t2+」−人1人Mt2   、
、、、、、、、、、、、、 −・(2)■ =システム
インテグリテイ λT=送信機が異常な信号を送信する確率λM:送信信
号の異常をモニタが検出できない確率t :モニタベリ
ファイの時間間隔 今、λ丁、λCC+λM、tをそれぞれ次の様に仮定す
ると、 λt=6X10−’ λcc= 0.07 X 10−6 λM=2.5X10−6 t=7日=168時間 危険率は R=7.25X 10=  となり、システ
ムインテグリテイは、 I崎1−7.25xlO−8 となる。
R=1−λγλ. . t2+” - 1 person Mt2,
, , , , , , , , , - (2) ■ = System integrity λT = Probability that the transmitter transmits an abnormal signal λM: Probability that the monitor cannot detect an abnormality in the transmitted signal t: Monitor verification Now, assuming that λd, λCC+λM, and t are as follows, λt=6X10-' λcc= 0.07 X 10-6 λM=2.5X10-6 t=7 days=168 hours Risk rate is R=7.25X10=, and the system integrity is Izaki1-7.25xlO-8.

(発明が解決しようとする問題点) しかしながら、上述した従来のモニタ方式にあっては、
−旦運用を停止しモニタベリファイを行うため、サービ
スの低下をまねくという問題点がある。
(Problems to be solved by the invention) However, in the conventional monitor method described above,
- There is a problem in that service is degraded because operations are stopped and monitor verification is performed.

また、保守要員の手動操作によりモニタベリファイを行
う方式であるため、モニタベリファイの周期が長くなら
ざるを得す、システムインテグリテイを上げることは困
難である。即ち、システムインテグリテイを上げるため
にはモニタベリファイの周期を短くする必要があり、保
守要員の負荷が増大するという問題点もある。
Furthermore, since monitor verification is performed manually by maintenance personnel, the cycle of monitor verification becomes 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.

本発明は、上記問題点に鑑みなされたもので、その目的
は、サービスの低下や保守要員の負荷の増大を招くこと
なく、システムインテグリテイを向上させることができ
るILS地上装置のモニタ方式を提供することにある。
The present invention has been made in view of the above problems, and its purpose is to provide a monitoring method for ILS ground equipment that can improve system integrity without deteriorating service or increasing the load on maintenance personnel. It's about doing.

(問題点を解決するための手段) 前記目的を達成するために、本発明のILS地上装置の
モニタ方式は次の如き構成を有する。
(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.

即ち、本発明のILS地上装置のモニタ方式は、ILS
地上装置の送信信号を検出するN(Nは自然数)個のモ
ニタセンサと; 検出した送信信号の良否判定を行うN
個のモニタ装置と; モニタ装置の前記判定動作の連署
を確認するためのモニタ信号を発生するN個のモニタ信
号発生器と;第1番目のモニタセンサと第1番目のモニ
タ信号発生器の各出力端のいずれかを切換指令に従って
選択しそれを第1番目のモニタ装置の入力端に接続する
N個のスイッチと: N個のスイッチのうちの1個のス
イッチは対応するモニタ信号発生器の出力端を選択し残
余のスイッチはそれぞれ対応するモニタセンサの出力端
を選択しかつこの組み合わせが順次変更することになる
前記切換指令を発生する制御手段と; を備えたことを
特徴とするものである。
That is, the ILS ground equipment monitoring method of the present invention
N monitor sensors (N is a natural number) that detect transmission signals from ground equipment; N monitor sensors that determine the quality of the detected transmission signals;
N monitor devices; N monitor signal generators that generate monitor signals for confirming the co-signature of the determination operation of the monitor devices; a first monitor sensor and a first monitor signal generator, respectively; N switches for selecting one of the outputs according to the switching command and connecting it to the input of the first monitoring device; A control means for selecting an output terminal, selecting the output terminal of the corresponding monitor sensor for each of the remaining switches, and generating the switching command such that the combination is sequentially changed. be.

(作 用) 次に、前記の如く構成される本発明のILS地上装置の
モニタ方式の作用を説明する。
(Function) Next, the function of the ILS ground equipment monitoring system of the present invention configured as described above will be explained.

例えばN=3とし、3台のモニタ装置A、同Bおよび同
Cがあるとすれば、この3台のそれぞれについてモニタ
ベリファイを行うのであるが、3台1度に行うのではな
く、内1台はモニタ信号入力を受け、残り2台は検出し
た送信信号の入力を受けるようにし、この組み合わせを
順次変更し、送信信号をモニタしながら並行してモニタ
装置A→同B−同C→同A・・・と順次1台ずつモニタ
ベリファイを行うことができる。
For example, if N=3 and there are three monitor devices A, B, and C, monitor verification is performed on each of these three devices, but it is not performed on all three at once, but on one of them. One unit receives the monitor signal input, and the remaining two units receive the detected transmission signal input, and this combination is changed sequentially, and while monitoring the transmission signal, the monitor device A→same B→same C→same A... The monitor verification can be performed one by one sequentially.

斯くして、本発明のILS地上装置のモニタ方式によれ
ば、本来的なモニタ動作を中断することなくそれと並行
してモニタベリファイを自動的に行えるので、サービス
の低下を招くことがないことは勿論のこと、保守要員の
手を借りることなくシステムインテグリテイを向上させ
ることができる効果がある。
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 there is no possibility of service deterioration. Of course, this has the effect of improving system integrity without requiring the help of maintenance personnel.

(実 施 例) 以下、本発明の実施例を図面を参照して説明する。(Example) Embodiments of the present invention will be described below with reference to the drawings.

第1図は本発明の一実施例に係るILS地上装置のモニ
タ方式を示す。なお、第2図と同一構成部分には同一符
号を付しその説明を省略する。
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.

本発明のモニタ方式は、従来方式のものに1系統のモニ
タセンサ13、モニタ信号発生器およびモニタ装置43
を付加するとともに、各系統の切換スイッチ31.同3
2および同33が制御器2から切換指令で動作するよう
にしたものである。
The monitor system of the present invention has one system of monitor sensor 13, monitor signal generator, and monitor device 43 in addition to the conventional system.
In addition to adding a changeover switch 31 for each system. Same 3
2 and 33 are operated by a switching command from the controller 2.

即ち、制御器2に設けられる制御手段は、3台のモニタ
装置41.同42および同43のうち1台はモニタ信号
入力を受け、残り2台は検出した送信信号の入力を受け
、かつこの組み合わせが順次変更されるように切換指令
を発生し、それを切換スイッチ31.同32および同3
3へ与える。
That is, the control means provided in the controller 2 includes three monitor devices 41. One of the units 42 and 43 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 sends it to the changeover switch 31. .. 32 and 3
Give to 3.

その結果、例えば、まずモニタセンサ11.同12から
の信号がそれぞれモニタ装置41.同42に入力される
よう切換スイッチ31.同32をセットし送信信号のモ
ニタを行い、同時にモニタ信号発生器23からの信号が
モニタ装置43に入力されるように切換スイッチ33を
セットし、モニタベリファイを行う。
As a result, for example, first the monitor sensor 11. The signals from the same 12 are sent to the monitor device 41. Selector switch 31. 32 is set 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, and monitor verification is performed.

モニタベリファイは通常数秒から数十秒間で行われるが
、モニタ装置43のモニタベリファイが完了すれば次に
、モニタセンサ12.同13からの信号がそれぞれモニ
タ装置42.同43に入力され、モニタ信号発生器21
からの信号がモニタ装置41に入力されるように切換ス
イッチ31゜同32.同33の設定を変更し、モニタ装
置41のモニタベリファイを行う。同様にモニタベリフ
ァイが完了すれば順次切換スイッチ31〜同33の設定
を変更し、2重のモニタ装置で送信信号を通常通りモニ
タしながらモニタ装置41〜同43全てのモニタベリフ
ァイを行うことができる。
The 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 monitor sensor 12. The signals from the monitor 13 are sent to the monitor device 42. 43, and the monitor signal generator 21
The changeover switch 31° and 32. so that the signal from 32. The settings of the monitor 33 are changed and monitor verification of the monitor device 41 is performed. Similarly, when the monitor verification is completed, the settings of the changeover switches 31 to 33 are sequentially changed, and the monitor verification of all the monitor devices 41 to 43 can be performed while monitoring the transmission signal as usual with the dual monitor device. .

ここで、本実施例のモニタ方式を採用するILS地上装
置の危険率Rは次の式(3)により計算される。
Here, the danger rate R of the ILS ground equipment adopting the monitoring method of this embodiment is calculated by the following equation (3).

R−一λ工λ。。t1+]冒λTA M t 2  −
−−−−−−−− (2)に こで t2・モニタベリファイの時間間隔 今、tlを従来通り t、=7日=168時間 とし、モニタ装置1台当りのモニタベリファイ時間を5
分とすると、 t2=15分=0.25時間 となるから、本実施例方式による危険率RはR=1..
98X10−’ となり、またシステムインテグリテイ■はI絢1−1.
98X10= となる、つまり、第2図に示した従来方式に比して本発
明方式では、危険率が1桁低下し、システムインテグリ
テイが向上するのである。
R-1λengineλ. . t1+] λTA M t 2 −
−−−−−−− (2) Nikode t2 Monitor verification time interval Now, tl is set as before, t, = 7 days = 168 hours, and the monitor verification time per monitor device is 5.
minutes, then t2=15 minutes=0.25 hours, so the risk rate R according to the method of this embodiment is R=1. ..
98X10-', and the system integrity is 1-1.
98×10= In other words, compared to the conventional method shown in FIG. 2, in the method of the present invention, the danger rate is reduced by one order of magnitude, and system integrity is improved.

なお、以上の説明から明らかなように、本発明方式は、
第2図に示した従来方式に1系統付加した構成であるか
ら、従来方式が1系統のモニタセンサ、モニタ信号発生
器およびモニタ装置からなる1重のモニタ方式である場
合には、これにさらに1系統付加し、1台のモニタ装置
は送信信号をモニタし、他の1台はモニタベリファイを
行い、これを交互に繰り返すことになることは言うまで
もない。
As is clear from the above explanation, the method of the present invention:
Since this is a configuration in which one system is added to the conventional system shown in Figure 2, if the conventional system is a single monitoring system consisting of one system of monitor sensor, monitor signal generator, and monitor device, there is an additional system. Needless to say, one system will be added, one monitor device will monitor the transmitted signal, the other one will perform monitor verification, and this will be repeated alternately.

(発明の効果) 以上説明したように、本発明のILS地上装置のモニタ
方式によれば、本来的なモニタ動作を中断することなく
それと並行してモニタベリファイを自動的に行えるので
、サービスの低下を招くことかないことは勿論のこと、
保守要員の手を借りることなくシステムインテグリテイ
を向上させることができる効果がある。
(Effects of the Invention) As explained above, according to the monitoring method of the ILS ground equipment of the present invention, monitor verification can be automatically performed in parallel without interrupting the original monitoring operation. Of course, it does not invite
This has the effect of improving system integrity without requiring the help of maintenance personnel.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例に係るILS地上装置のモニ
タ方式の構成ブロック図、第2図は従来方式の構成ブロ
ック図である。 1・・・・・・送信機、 2.2′・・・・・・制御器
、11〜13・・・・・・モニタセンサ、 21〜23
・・・・・・モニタ信号発生器、 31〜33.31’
 、32’・・・・・・切換スイッチ、 41〜43・
・・・・・モニタ装置。 代理人 弁理士  八 幡  義 博 携し東、CILS地二鋏10モニグオ入カ横]に伊]第
 2 図
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, 11-13...Monitor sensor, 21-23
...Monitor signal generator, 31 to 33.31'
, 32'...changeover switch, 41-43.
...Monitor device. Agent: Patent Attorney Yoshihiro Hachiman, CILS Jijiscissors 10 Moniguo Entry] Figure 2

Claims (1)

【特許請求の範囲】[Claims] ILS地上装置の送信信号を検出するN(Nは自然数)
個のモニタセンサと;検出した送信信号の良否判定を行
うN個のモニタ装置と;モニタ装置の前記判定動作の適
否を確認するためのモニタ信号を発生するN個のモニタ
信号発生器と;第i番目のモニタセンサと第i番目のモ
ニタ信号発生器の各出力端のいずれかを切換指令に従っ
て選択しそれを第i番目のモニタ装置の入力端に接続す
るN個のスイッチと;N個のスイッチのうちの1個のス
イッチは対応するモニタ信号発生器の出力端を選択し残
余のスイッチはそれぞれ対応するモニタセンサの出力端
を選択しかつこの組み合わせが順次変更することになる
前記切換指令を発生する制御手段と;を備えたことを特
徴とするILS地上装置のモニタ方式。
N to detect the transmission signal of the ILS ground equipment (N is a natural number)
N monitor sensors that determine the quality of the detected transmission signals; N monitor signal generators that generate monitor signals for checking the suitability of the determination operations of the monitor devices; N switches that select one of the output terminals of the i-th monitor sensor and the i-th monitor signal generator according to a switching command and connect it to the input terminal of the i-th monitor device; One of the switches selects the output of the corresponding monitor signal generator, each of the remaining switches selects the output of the corresponding monitor sensor, and this combination sequentially changes the switching commands. 1. A monitoring method for ILS ground equipment, characterized by comprising a control means for generating an ILS.
JP62286230A 1987-11-12 1987-11-12 Monitoring system for ils ground device Granted JPH01127985A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62286230A JPH01127985A (en) 1987-11-12 1987-11-12 Monitoring system for ils ground device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62286230A JPH01127985A (en) 1987-11-12 1987-11-12 Monitoring system for ils ground device

Publications (2)

Publication Number Publication Date
JPH01127985A true JPH01127985A (en) 1989-05-19
JPH05669B2 JPH05669B2 (en) 1993-01-06

Family

ID=17701655

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62286230A Granted JPH01127985A (en) 1987-11-12 1987-11-12 Monitoring system for ils ground device

Country Status (1)

Country Link
JP (1) JPH01127985A (en)

Also Published As

Publication number Publication date
JPH05669B2 (en) 1993-01-06

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