JPH06276166A - Antenna fault detection device - Google Patents
Antenna fault detection deviceInfo
- Publication number
- JPH06276166A JPH06276166A JP5064553A JP6455393A JPH06276166A JP H06276166 A JPH06276166 A JP H06276166A JP 5064553 A JP5064553 A JP 5064553A JP 6455393 A JP6455393 A JP 6455393A JP H06276166 A JPH06276166 A JP H06276166A
- Authority
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- Japan
- Prior art keywords
- antenna
- output
- value
- peak
- receiver
- Prior art date
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- Monitoring And Testing Of Transmission In General (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Radio Transmission System (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、空中線障害検出装置
に関し、特にスペースダイバーシティ方式無線機におけ
る空中線の障害を検出する装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna failure detecting apparatus, and more particularly to an apparatus for detecting an antenna failure in a space diversity type radio.
【０００２】[0002]
【従来の技術】一般にスペースダイバーシティ方式無線
機は２系統のアンテナおよび受信機を設け、その各々の
受信出力を比較し、受信感度の良い方の受信機の復調出
力に切り換えることにより、電波の受信レベルの変動に
対応でき、常に良好な回線品質を確保しようとするもの
で、自動車等の移動体に搭載される電話機等で使用され
るものである。2. Description of the Related Art Generally, a space diversity type radio device is provided with two systems of antennas and receivers, compares the reception output of each of them, and switches to the demodulation output of the receiver having better reception sensitivity to receive radio waves. It is intended to be able to cope with fluctuations in level and always ensure good line quality, and is used in telephones and the like mounted on mobile bodies such as automobiles.
【０００３】このような、スペースダイバーシティ方式
の無線機においては上述のように、２系統の受信機の受
信出力を比較してその良好な方を選択するために、両方
の系統のアンテナが常に正常に機能していることが必要
であるが、このアンテナは移動体の室外に取付けられて
いるので風雨にさらされており、これにより自然にその
性能が劣化したり、また、アンテナが移動体外の物体と
接触して破損したりすること等によって障害が生じるこ
とがある。In such a space diversity type radio device, as described above, in order to compare the reception outputs of the receivers of the two systems and select the better one, the antennas of both systems are always normal. However, since this antenna is installed outside the moving body, it is exposed to the weather, which naturally degrades its performance and also causes the antenna to move outside the moving body. A failure may occur due to contact with an object and damage.
【０００４】図８はこのようなスペースダイバーシティ
方式の無線機における従来の空中線障害を検出する方式
のブロック図である。図において、２１，２２はダイバ
ーシティ受信のために２系統用意された空中線、３１，
３２はこの空中線２１，２２を受信時と送信時で切り換
えて送信機および受信機に接続する送受切替器、１１は
空中線２１で受信した電波を復調する１系の受信機、１
２は空中線２２で受信した電波を復調する２系の受信
機、１は変調入力を送信出力に変換する送信機、５はこ
の送信機１の送信出力の一部を取り出す結合器、６は結
合器５を介して送信機１から空中線へ出力される信号の
うち反射成分の有無を検出する反射検出器、７は反射検
出器６の出力から空中線２１あるいは２２に障害が発生
したか否かを検出する障害検出器である。FIG. 8 is a block diagram of a conventional method for detecting an antenna failure in such a space diversity type radio device. In the figure, 21 and 22 are antennas prepared for two systems for diversity reception, 31, and
Reference numeral 32 designates a transmitter / receiver switch that switches the antennas 21 and 22 between reception and transmission to connect to the transmitter and the receiver. Reference numeral 11 designates a 1-system receiver for demodulating the radio wave received by the antenna 21.
2 is a receiver for demodulating the radio wave received by the antenna 22, 1 is a transmitter for converting a modulation input into a transmission output, 5 is a coupler for extracting a part of the transmission output of the transmitter 1, and 6 is a coupling A reflection detector for detecting the presence / absence of a reflection component in the signal output from the transmitter 1 to the antenna via the device 5, and 7 indicates whether the antenna 21 or 22 has a failure from the output of the reflection detector 6. It is a fault detector to detect.
【０００５】次に動作について説明する。受信時には空
中線(1) ２１が受信機(1) １１に、また空中線(2) ２２
が受信機(2) １２に接続されるように、送受切替器(1)
３１および送受切替器(2) ３２が動作し、受信信号は空
中線(1) ２１および空中線(2) ２２を経て受信機(1) １
１および受信機(2) １２により同時に受信される。そし
て、この２つの受信機１１および１２の受信出力は図示
しない比較器により比較され、この比較器により受信電
界の強い方の空中線が選択されるように、送受切替器
(1) ３１および送受切替器(2) ３２が選択され、ダイバ
ーシティ受信される。Next, the operation will be described. At the time of reception, the antenna (1) 21 becomes the receiver (1) 11 and the antenna (2) 22
So that the receiver is connected to the receiver (2) 12
31 and the transmission / reception switching device (2) 32 operate, and the reception signal passes through the antenna (1) 21 and the antenna (2) 22 to the receiver (1) 1
1 and the receiver (2) 12 simultaneously. Then, the reception outputs of the two receivers 11 and 12 are compared by a comparator (not shown), and this comparator selects the antenna having the stronger reception electric field so that the transmission / reception switching device is selected.
(1) 31 and the duplexer (2) 32 are selected and diversity reception is performed.
【０００６】一方、送信時には送信機１が空中線(1) ２
１または空中線(2) ２２のどちらか一方、すなわち受信
時に検出された受信電界の強い方に接続されるように、
送受切替器(1) ３１および送受切替器(2) ３２が動作
し、送信出力は回線状態のよい方の空中線から送出され
る。On the other hand, at the time of transmission, the transmitter 1 uses the antenna (1) 2
1 or antenna (2) 22, which is connected to the stronger one of the received electric fields detected at the time of reception,
The transmission / reception switching device (1) 31 and the transmission / reception switching device (2) 32 operate, and the transmission output is sent from the antenna with the better line condition.
【０００７】空中線(1) ２１または空中線(2) ２２に障
害が発生した場合、障害が発生した空中線のＶＳＷＲ
（Voltage Standing Wave Ratio:電圧定在波比）は悪化
しているため、本空中線を経由して送信される送信出力
はすべてが空中線から送出されるとは限らず、送信機１
側へ戻る反射波信号が生じる。When the antenna (1) 21 or the antenna (2) 22 fails, the VSWR of the failed antenna
Since the (Voltage Standing Wave Ratio) has deteriorated, not all the transmission output transmitted via this antenna is sent from the antenna, and the transmitter 1
A reflected wave signal that returns to the side is generated.
【０００８】この反射波を結合器５より取り出し、反射
検出器６によりＶＳＷＲを検出し、障害空中線がある一
定以上のＶＳＷＲとなった時、障害検出器７にて空中線
に障害があると判断する。すなわち、軽度の障害であれ
ばＶＳＷＲが例えば６程度、障害の度合いが大きい場合
は例えば１０以上のＶＳＷＲとなるので、この値以上に
なった時に障害が発生したと判定する。This reflected wave is taken out from the coupler 5, the VSWR is detected by the reflection detector 6, and when the obstacle antenna has a VSWR above a certain level, the obstacle detector 7 judges that there is an obstacle in the antenna. . In other words, the VSWR is, for example, about 6 for a mild failure, and is 10 or more for a large failure, so that it is determined that a failure has occurred when the VSWR exceeds this value.
【０００９】[0009]
【発明が解決しようとする課題】従来の空中線障害検出
装置は以上のように構成されており、常に受信感度の良
い方の空中線が選択されるので、受信電界の具合によっ
ては一方の空中線のみが常時選択される場合があり、こ
の場合、選択されない側の空中線に障害が発生していて
もこれを検出できないことになる。従って、空中線の障
害を検出するためには送信時、空中線を１系および２系
に故意に順次切替えて個々の空中線の障害の有無を検出
し、これを定期的に繰り返す必要がある。このため、障
害を検出している間、回線のよい空中線を必ず選択して
いるとは限らず、悪い方の空中線を選択している間に
は、回線品質の劣化が生じてしまうという問題があっ
た。またこれを避けようとすると、非通話時に障害検出
のためだけに送信状態とする必要があり、他の通話に妨
害を与えるなどの問題点があった。The conventional antenna obstacle detecting device is constructed as described above, and since the antenna having the better receiving sensitivity is always selected, only one antenna may be selected depending on the condition of the received electric field. It may be always selected, and in this case, even if there is a failure in the antenna on the non-selected side, this cannot be detected. Therefore, in order to detect the failure of the antenna, it is necessary to intentionally sequentially switch the antenna to the 1-system and the 2-system at the time of transmission to detect the presence or absence of the failure of each antenna, and repeat this periodically. For this reason, while detecting a failure, the antenna with a good line is not always selected, and while the antenna with a bad line is selected, the line quality deteriorates. there were. In order to avoid this, there is a problem in that it is necessary to set the transmission state only for detecting a failure when a call is not made, which disturbs other calls.
【００１０】また、上述のような一方の空中線のみが選
択されてしまうために、障害が検出されない空中線が生
じるという問題を回避するために、特開昭６３−３８３
３７号公報に示されたスペースダイバーシティ受信機の
障害検出方式では、試験専用の送信機を設けるとともに
受信感度の良い方のアンテナを受信機を選択するための
選択切替器とは別に差分増幅器を設け、この試験用送信
機が試験を行なう時に２つの受信機の受信電界の差を求
める差分増幅器を動作させてその差分信号を求め、これ
を所定電圧と比較してどちらの受信機に障害が発生して
いるかを検出するようにしている。Further, in order to avoid the problem that an antenna with no obstacle is detected because only one antenna is selected as described above, Japanese Patent Laid-Open No. 63-383.
In the failure detection method of the space diversity receiver disclosed in Japanese Patent No. 37, a test-dedicated transmitter is provided, and a differential amplifier is provided separately from the selection switcher for selecting the antenna with the better reception sensitivity. , When this test transmitter performs a test, it operates a differential amplifier that determines the difference between the received electric fields of the two receivers, obtains the difference signal, compares this with a predetermined voltage, and a failure occurs in which receiver. I am trying to detect what I am doing.
【００１１】この先行技術によれば、受信時に障害検出
を行なうため、送信時に障害検出を行なう上述のような
障害検出方式における問題は解決されるが、専用の送信
機を必要として設備が大がかりになったり、また、試験
時間を設ける必要があるためリアルタイムで障害検出を
行なうことはできず、通話サービスの供用を受けられな
い時間が生じるなどの問題点があった。According to this prior art, since the failure detection is performed at the time of reception, the problem in the failure detection method as described above, in which the failure detection is performed at the time of transmission, can be solved, but a dedicated transmitter is required and the equipment becomes large. In addition, since it is necessary to provide a test time, it is impossible to detect a failure in real time, and there is a problem that a call service cannot be serviced.
【００１２】この発明は、上記のような問題点を解消す
るためになされたもので、運用時（通信時）にも回線品
質の劣化等がないなど、運用に全く支障をきたすことな
く、常にリアルタイムで空中線の障害を検出でき、また
不必要な送信を行うことがなく他の通信に妨害を与える
ことなく空中線の障害を検出することができる空中線障
害検出装置を提供することを目的とする。The present invention has been made in order to solve the above problems, and does not cause any trouble in operation, such as no deterioration of line quality during operation (during communication), and always works. An object of the present invention is to provide an antenna failure detection device capable of detecting an antenna failure in real time and capable of detecting an antenna failure without causing unnecessary transmission and without disturbing other communications.
【００１３】[0013]
【課題を解決するための手段】この発明に係る空中線障
害検出装置は、個々の空中線に接続された個々の受信機
において、受信された信号のそれぞれの電界検出出力を
一定時間周期で常時監視し、各一定時間毎にその一定時
間内におけるピーク値を検出し、個々の受信系における
各ピーク値を互いに比較することにより、著しく値（電
界値）の低い方の空中線を障害と判断するものである。SUMMARY OF THE INVENTION An antenna obstacle detecting apparatus according to the present invention constantly monitors the electric field detection output of each received signal in a constant time period in each receiver connected to each antenna. , The peak value in each fixed time is detected and the peak values in the individual receiving systems are compared with each other to judge that the antenna with the significantly lower value (electric field value) is the obstacle. is there.
【００１４】また、この発明に係る空中線障害検出装置
は、個々の空中線に接続された個々の受信機において、
受信された信号のそれぞれの電界検出出力を一定時間周
期で常時監視し、各一定時間毎にその一定時間内におけ
るピーク値を検出し、個々の受信系における各ピーク値
を互いに比較することにより、著しく値（電界値）の低
い方の空中線を障害と判断するとともに、送信機の送信
出力の空中線による反射成分を検出し、その反射成分の
大きさが大きい空中線を障害と判断するようにしたもの
である。Further, the antenna obstacle detecting device according to the present invention is characterized in that in each receiver connected to each antenna,
By constantly monitoring the electric field detection output of each of the received signals in a fixed time period, detecting the peak value within the fixed time for each fixed time, by comparing each peak value in the individual receiving system with each other, The antenna with a remarkably low value (electric field value) is judged as an obstacle, and the reflected component due to the antenna of the transmission output of the transmitter is detected, and the antenna with a large magnitude of the reflected component is judged as an obstacle. Is.
【００１５】[0015]
【作用】この発明における空中線障害検出装置は、空中
線が正常な側の該空中線に接続された受信機の受信電界
出力（値）の一定時間内におけるピーク値に比べ，障害
が発生した側の該空中線に接続された受信機の受信電界
出力（値）の一定時間内におけるピーク値は小さいこと
を利用して、両者の値を比較するようにしたので、空中
線の障害をリアルタイムで判定できる。The antenna failure detecting apparatus according to the present invention is characterized in that the receiving side electric field output (value) of the receiver connected to the antenna on the side where the antenna is normal is higher than the peak value within a certain period of time on the side where the failure occurs. The fact that the peak value of the received electric field output (value) of the receiver connected to the antenna within a fixed time is small is used to compare the two values, so that the failure of the antenna can be determined in real time.
【００１６】また、この発明における空中線障害検出装
置は、上述のように、空中線が正常な側の該空中線に接
続された受信機の受信電界出力（値）の一定時間内にお
けるピーク値に比べ，障害が発生した側の該空中線に接
続された受信機の受信電界出力（値）の一定時間内にお
けるピーク値は小さいことを利用して、両者の値を比較
するとともに、空中線に障害が発生していれば送信電力
の反射があることを利用して、送信時にも障害の有無を
検出するようにしたので、受信時に空中線の障害をリア
ルタイムで判定できるとともに、送信時においてもその
障害検出が可能になり、監視状態が途切れるのを防止で
きる。Further, as described above, the antenna failure detecting apparatus according to the present invention is characterized by comparing the peak value of the received electric field output (value) of the receiver connected to the antenna on the side where the antenna is normal within a fixed time, Taking advantage of the fact that the peak value of the received electric field output (value) of the receiver connected to the antenna on the faulty side within a certain period of time is small, the two values are compared, and at the same time a fault occurs on the antenna. If there is, the presence or absence of a fault is detected during transmission by utilizing the fact that there is a reflection of the transmission power, so it is possible to determine the fault in the antenna in real time when receiving, and it is also possible to detect the fault during transmission. Therefore, it is possible to prevent the monitoring state from being interrupted.
【００１７】[0017]
【実施例】実施例１．以下、この発明の一実施例を図に
ついて説明する。図１はこの発明の一実施例による空中
線障害検出装置を示す。図において、２１，２２はダイ
バーシティ受信のために２系統用意された空中線(1) ，
(2) 、３１，３２はこの空中線２１，２２を受信時と送
信時で切り換えて送信機および受信機に接続する送受切
替器(1) ，(2) 、１１は空中線２１で受信した電波を復
調する１系の受信機(1) 、１２は空中線２２で受信した
電波を復調する２系の受信機(2) 、４１は受信機(1) １
１から出力される受信電界出力をある一定時間単位で連
続して監視し、各一定時間内におけるピーク値を検出す
るピーク検出器(1)、４２は受信機(2) １２から出力さ
れる受信電界出力を前記同様にある一定時間単位で連続
して監視し、各一定時間内におけるピーク値を検出する
ピーク検出器(2) 、２はピーク検出器(1) ４１およびピ
ーク検出器(2) ４２の出力（値）の差の絶対値を所定値
と比較する比較器、３は比較器２の出力より空中線の障
害を検出する障害検出器である。また、１は変調入力を
送信出力に変換する送信機である。EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an antenna obstacle detecting apparatus according to an embodiment of the present invention. In the figure, 21 and 22 are antennas (1) prepared for two systems for diversity reception,
(2), 31 and 32 switch the antennas 21 and 22 at the time of reception and at the time of transmission to connect to the transmitter and the receiver. (1), (2), and 11 indicate radio waves received by the antenna 21. 1-system receiver (1) for demodulation, 12 is a 2-system receiver (2) for demodulating the radio wave received by the antenna 22, 41 is a receiver (1) 1
The peak detectors (1) and 42 that continuously monitor the output of the received electric field from 1 in a certain time unit and detect the peak value within each constant time are the reception signals output from the receiver (2) 12. A peak detector (2) that continuously monitors the electric field output in a certain fixed time unit and detects the peak value within each fixed time, 2 is a peak detector (1) 41 and a peak detector (2) The comparator 3 for comparing the absolute value of the difference between the outputs (values) of 42 with a predetermined value is a failure detector 3 for detecting the failure of the antenna from the output of the comparator 2. Further, 1 is a transmitter for converting a modulation input into a transmission output.
【００１８】また、図２は図１のピーク検出器の内部構
成の一例を示すブロック図である。図において、４１ａ
は受信機１１の出力を所定の周期でサンプリングするサ
ンプリング回路、４１ｂはこのサンプリング回路４１ａ
の出力を一定時間分記憶する記憶回路、４１ｃはこの記
憶回路４１ｂの出力中の最大値を検出する最大値検出回
路である。ピーク検出器４２もこのピーク検出器４１と
同様の構成を持つものである。なお、ピーク検出のため
の電子的手段は周知であるので、ピーク検出器の構成の
仕方はこの図２のものに限られるものでないことは言う
までもない。FIG. 2 is a block diagram showing an example of the internal structure of the peak detector shown in FIG. In the figure, 41a
Is a sampling circuit for sampling the output of the receiver 11 in a predetermined cycle, and 41b is the sampling circuit 41a.
Is a memory circuit for storing the output of the memory for a certain period of time, and 41c is a maximum value detection circuit for detecting the maximum value in the output of the memory circuit 41b. The peak detector 42 also has the same configuration as the peak detector 41. It is needless to say that the peak detector is not limited to the one shown in FIG. 2 because the electronic means for peak detection is well known.
【００１９】次に動作について説明する。空中線１およ
び空中線２が正常な受信時および送信時の動作は従来技
術の説明と同じである。即ち、受信時には空中線(1) ２
１が受信機(1) １１に、また空中線(2) ２２が受信機
(2) １２に接続されるように、送受切替器(1) ３１およ
び送受切替器(2)３２が動作し、受信信号は空中線(1)
２１および空中線(2) ２２を経て受信機(1) １１および
受信機(2) １２により同時に受信される。そして、この
２つの受信機１１および１２の受信出力は図示しない比
較器により比較され、当該比較器により受信電界の強い
方の空中線および受信機からの信号、即ち復調出力(1)
または復調出力(2) のいずれかが図示しない選択器によ
り選択されるように、送受切替器(1) ３１および送受切
替器(2) ３２が選択され、ダイバーシティ受信される。Next, the operation will be described. The operations of the antenna 1 and the antenna 2 at the time of normal reception and transmission are the same as those described in the related art. That is, the antenna (1) 2 when receiving
1 is the receiver (1) 11 and antenna (2) 22 is the receiver
(2) The transmission / reception switching device (1) 31 and the transmission / reception switching device (2) 32 are operated so that they are connected to 12, and the reception signal is the antenna (1).
It is simultaneously received by the receiver (1) 11 and the receiver (2) 12 via 21 and the antenna (2) 22. Then, the reception outputs of the two receivers 11 and 12 are compared by a comparator (not shown), and the comparator outputs the signal from the antenna and the receiver having the stronger electric field, that is, the demodulation output (1).
Alternatively, the transmission / reception switcher (1) 31 and the transmission / reception switcher (2) 32 are selected so that either of the demodulation outputs (2) is selected by a selector (not shown), and diversity reception is performed.
【００２０】このとき、ピーク検出器(1) ４１およびピ
ーク検出器(2）４２において、受信機(1) １１および受
信機(2）１２の受信電界出力をそれぞれ一定時間単位で
連続して監視している。このピーク検出器の動作をピー
ク検出器(1) ４１を例にとって説明すると、まず、サン
プリング回路４１ａにより受信機(1) １１の出力が一定
間隔のサンプリングタイミングでサンプリングされ、こ
れが記憶回路４１ｂにて一定時間分記憶される。この一
定時間分記憶された受信電界出力の最大値が最大値検出
回路４１ｃで検出される。At this time, in the peak detector (1) 41 and the peak detector (2) 42, the received electric field outputs of the receiver (1) 11 and the receiver (2) 12 are continuously monitored in fixed time units. is doing. The operation of the peak detector will be described by taking the peak detector (1) 41 as an example. First, the output of the receiver (1) 11 is sampled by the sampling circuit 41a at a sampling timing at regular intervals, and this is stored in the storage circuit 41b. It is stored for a certain period of time. The maximum value of the received electric field output stored for this fixed time is detected by the maximum value detection circuit 41c.
【００２１】このようにして検出された一定時間内にお
ける受信電界のピーク値は、この場合空中線(1）２１お
よび空中線(2) ２２に障害が発生していないので、その
一定時間内における受信電界出力（値）のピークＡ（ｄ
ＢμＶ），ピークＢ（ｄＢμＶ）の差は障害検出時のよ
うに大きくなることはない。In this case, the peak value of the received electric field detected within the fixed time is the received electric field within the fixed time because the antenna (1) 21 and the antenna (2) 22 are not damaged in this case. Output (value) peak A (d
The difference between B μV) and peak B (dB μV) does not become large unlike when a failure is detected.
【００２２】従って、比較器２においてピーク検出器
(1) ４１およびピーク検出器(2) ４２の出力の差の絶対
値を所定値と比較しその比較結果を障害検出器３に入力
しても障害が検出された旨の信号は出力されない。Therefore, in the comparator 2, the peak detector
Even if the absolute value of the difference between the outputs of (1) 41 and the peak detector (2) 42 is compared with a predetermined value and the comparison result is input to the fault detector 3, a signal indicating that a fault has been detected is not output.
【００２３】一方、送信時には送信機１が空中線(1) ２
１または空中線(2) ２２のいずれか一方、すなわち受信
時に電界の強い方に接続されるように、送受切替器(1)
３１および送受切替器(2) ３２が動作し、送信出力は受
信時に検出された回線状態のよい方の空中線から送出さ
れる。On the other hand, at the time of transmission, the transmitter 1 uses the antenna (1) 2
1 or antenna (2) 22, which is connected to the one with the stronger electric field at the time of reception, that is, the duplexer (1)
31 and the transmission / reception switch (2) 32 operate, and the transmission output is transmitted from the antenna with the better line condition detected at the time of reception.
【００２４】次に空中線に障害が発生した場合の動作に
ついて説明する。 （Ｉ）空中線(2) ２２に障害が発生し空中線(1) ２１は
正常な場合 受信信号は空中線(1) ２１を経由し受信機(1) １１にて
受信され、ピーク検出器(1) ４１によりその受信電界出
力を一定時間単位で連続して監視し各一定時間内におけ
る受信電界出力（値）のピークをＡ（ｄＢμＶ）とす
る。Next, the operation when a failure occurs in the antenna will be described. (I) When the antenna (2) 22 fails and the antenna (1) 21 is normal The received signal is received by the receiver (1) 11 via the antenna (1) 21 and the peak detector (1) The output of the received electric field is continuously monitored by the unit 41 by a constant time unit, and the peak of the received electric field output (value) within each constant time is set to A (dBμV).
【００２５】一方、前記と同様に受信信号は空中線(2)
２２を経由し受信機(2) １２にて受信され、ピーク検出
器(2) ４２によりその受信電界を一定時間単位で連続し
て監視し各一定時間内における受信電界出力（値）のピ
ークをＢ（ｄＢμＶ）とする。このとき、空中線(2) ２
２は障害が発生しているため利得が空中線(1) ２１より
低く、利得が低い分受信電界出力（値）ＢはＡより小さ
くなる。（II）空中線(1) ２１に障害が発生し空中線
(2) ２２は正常な場合、（Ｉ）と同様な動作により、結
果として受信電界出力（値）ＡはＢより小さくなる。On the other hand, similarly to the above, the received signal is the antenna (2).
The signal is received by the receiver (2) 12 via 22 and the received electric field is continuously monitored by the peak detector (2) 42 in constant time units, and the peak of the received electric field output (value) within each constant time is detected. B (dB μV). At this time, antenna (2) 2
In No. 2, the gain is lower than that of the antenna (1) 21 due to the occurrence of the obstacle, and the received electric field output (value) B is smaller than A because the gain is low. (II) Antenna (1) A failure occurred in 21 and the antenna
(2) When 22 is normal, as a result, the received electric field output (value) A becomes smaller than B by the same operation as (I).
【００２６】次に受信電界出力（値）ＡおよびＢは比較
器２においてその差の絶対値が基準値と比較され、この
比較結果が受信電界出力（値）ＡおよびＢの差の符号と
ともに障害検出器３へ送出され、ここで空中線(1) ２１
または空中線(2) ２２の障害判定が行われる。すなわ
ち、受信電界出力（値）の差の絶対値が例えば２０ない
し３０ｄＢ等のある一定値以上となった場合、前記比較
器２はこの差を所定値と比較して所定値よりも大きい旨
を出力し、障害検出器３は受信電界出力（値）Ａおよび
Ｂの差の符号に応じて前記出力（値）の小さい方（Ａま
たはＢ）を出力する受信機に接続された空中線を障害と
判断する。Next, the absolute values of the differences between the received electric field outputs (values) A and B are compared with a reference value in a comparator 2, and the result of this comparison together with the sign of the difference between the received electric field outputs (values) A and B is a fault. It is sent to the detector 3, where the antenna (1) 21
Alternatively, the failure determination of the antenna (2) 22 is performed. That is, when the absolute value of the difference in the output (value) of the received electric field exceeds a certain fixed value such as 20 to 30 dB, the comparator 2 compares this difference with the predetermined value and indicates that the difference is larger than the predetermined value. The failure detector 3 outputs the antenna having the smaller output (value) (A or B) depending on the sign of the difference between the received electric field outputs (values) A and B as an obstacle. to decide.
【００２７】これに対し、上述のように、両空中線が正
常動作し受信電界出力（値）の差がある一定値以下の場
合、本障害検出機能は障害がある旨の信号は出力しな
い。On the other hand, as described above, when both antennas operate normally and the difference in the received electric field output (value) is less than a certain value, this fault detection function does not output a signal indicating that there is a fault.
【００２８】このように、上記実施例によれば、２つの
系統の受信機のそれぞれにおいてその受信電界のピーク
値を一定時間単位で連続して求め、その差が所定値を越
えるか否かによって空中線に障害が生じているか否かを
判定するようにしたので、通常の受信動作中にこれと並
行して障害検出を行なうことができ、運用に支障をきた
したり回線品質の劣化を招いたりすることなくリアルタ
イムで空中線の障害を検出することができる。また、送
信時に障害検出を行なうのではなく受信時にこれを行な
うので、不必要な送信を行うことがなく他の通信に妨害
を与えることがない。しかも障害検出のために特別な送
信機等を用意する必要がなく受信機自体で空中線の障害
の有無を検出することができる。As described above, according to the above-described embodiment, the peak value of the received electric field is continuously obtained in a constant time unit in each of the receivers of the two systems, and it is determined whether the difference exceeds a predetermined value. Since it is determined whether or not there is a failure in the antenna, failure detection can be performed in parallel with normal reception operation, which may hinder operation or lead to deterioration of line quality. It is possible to detect the obstacle of the antenna in real time without. Further, since the failure detection is not performed at the time of transmission but is performed at the time of reception, unnecessary transmission is not performed and interference is not given to other communication. Moreover, it is not necessary to prepare a special transmitter or the like for detecting a failure, and the receiver itself can detect the presence or absence of a failure in the antenna.
【００２９】なお、上記実施例では、受信機出力の受信
電界出力をある一定時間単位で連続して監視することに
よりダイバーシティ無線機を運用中、スタンディング等
の受信電界の瞬時変動による誤検出を防止するようにし
たが、一定時間内の監視を行わずフェージングの毎サイ
クルごとのピーク値を求めてもよい。In the above embodiment, the reception electric field output of the receiver output is continuously monitored in a unit of a constant time to prevent erroneous detection due to an instantaneous fluctuation of the reception electric field such as standing during the operation of the diversity radio. However, the peak value for each cycle of fading may be obtained without monitoring within a certain period of time.
【００３０】実施例２．なお、上記実施例では、ダイバ
ーシティ無線機で空中線が直接接続された場合について
説明したが、ダイバーシティ無線機と空中線の間に伝送
回路等の他の回路が挿入された場合も同様の効果を奏す
る。Example 2. In the above embodiment, the case where the antenna is directly connected by the diversity radio device has been described, but the same effect can be obtained when another circuit such as a transmission circuit is inserted between the diversity radio device and the antenna.
【００３１】図３はこのように、ダイバーシティ無線機
と空中線の間に伝送回路等の他の回路が挿入された本発
明の第２の実施例を示す。図３において、５１および５
２は送受切替機(1) ３１と空中線(1) ２１との間および
送受切替器(2) ３２と空中線(2) ２２との間にそれぞれ
が挿入され能動素子を使用した回路（増幅器等）あるい
は受動素子を使用した回路（切替器，ケーブル等）等か
らなる伝送回路である。FIG. 3 shows a second embodiment of the present invention in which another circuit such as a transmission circuit is thus inserted between the diversity radio device and the antenna. In FIG. 3, 51 and 5
2 is a circuit (amplifier, etc.) using active elements, which are respectively inserted between the transmission / reception switcher (1) 31 and the antenna (1) 21 and between the transmission / reception switcher (2) 32 and the antenna (2) 22. Alternatively, it is a transmission circuit including a circuit (switch, cable, etc.) using passive elements.
【００３２】この実施例においても、実施例１と同様の
動作によって、空中線の障害検出が可能となる。また、
この実施例の場合、伝送回路５１および５２に障害があ
る場合にその検出が可能になることは言うまでもない。Also in this embodiment, by the same operation as that of the first embodiment, it becomes possible to detect the failure of the antenna. Also,
In the case of this embodiment, it goes without saying that if there is a failure in the transmission circuits 51 and 52, it can be detected.
【００３３】実施例３．また、上記実施例ではダイバー
シティ無線機において受信機が２台の場合について説明
したが、受信機が２台以上の複数台の場合でも同様の効
果を奏する。Example 3. Further, in the above embodiment, the case where the number of receivers is two in the diversity radio device has been described, but the same effect can be obtained even when the number of receivers is two or more.
【００３４】図４はこのように受信機が２台以上の複数
台を設けた本発明の第３の実施例を示す。図４におい
て、２１ないし２ｎはダイバーシティ受信のためにｎ系
統用意された空中線(1) ないし空中線(n) 、１１ないし
１ｎは受信機(1) １１，受信機(2) １２と同様の機能を
持つ受信機(1) ないし受信機(n) 、４１ないし４ｎはピ
ーク検出回路(1) ４１，ピーク検出回路(2) ４２と同等
の機能を持つピーク検出回路(1) ないしピーク検出回路
(n) 、４はこれらの複数のピーク検出回路４１〜４ｎの
出力のうち最大の値と他の値との差、それぞれを所定の
値と比較する比較器である。FIG. 4 shows a third embodiment of the present invention in which a plurality of receivers such as two or more are provided. In FIG. 4, 21 to 2n are antennas (1) to antennas (n) prepared for n systems for diversity reception, and 11 to 1n are the same functions as the receiver (1) 11 and the receiver (2) 12. The receivers (1) to (n), 41 to 4n are the peak detection circuit (1) 41 and the peak detection circuit (2) 42 having the same functions as the peak detection circuit (1) 41 and the peak detection circuit (2) 42.
(n) 4 is a comparator for comparing the difference between the maximum value and the other value among the outputs of the plurality of peak detection circuits 41 to 4n with each other and a predetermined value.
【００３５】比較器４ではｎ個のピーク検出回路の出力
を比較し、そのうちの例えば１つが他のピーク検出回路
の出力値と比較して例えば２０ないし３０ｄＢ等の一定
値以上の差（低下）がある場合、本ピーク検出回路に接
続された受信機の系の空中線を障害と判断する。The comparator 4 compares the outputs of the n peak detection circuits, and, for example, one of them compares with the output value of another peak detection circuit, and a difference (decrease) of a certain value or more such as 20 to 30 dB. If there is, the antenna of the system of the receiver connected to this peak detection circuit is judged as a fault.
【００３６】実施例４．また、上記各実施例ではダイバ
ーシティ無線機において受信電界の最大値を検出するこ
とにより空中線に障害があるか否かを検出するようにし
たが、送信電力の電圧定在波比が所定値以上であるか否
かを判定することにより空中線に障害があるか否かを検
出する従来の方式と併用するようにしてもよい。Example 4. Further, in each of the above embodiments, the diversity radio device detects the maximum value of the reception electric field to detect whether or not there is an obstacle in the antenna, but the voltage standing wave ratio of the transmission power is equal to or greater than a predetermined value. It may be used in combination with a conventional method of detecting whether or not there is an obstacle in the antenna by determining whether or not there is an obstacle.
【００３７】図５はこの発明の第４の実施例による空中
線障害検出装置を示す。図において、２１，２２はダイ
バーシティ受信のために２系統用意された空中線(1) ，
(2)、３１，３２はこの空中線２１，２２を受信時と送
信時で切り換えて送信機および受信機に接続する送受切
替器(1) ，(2) 、１１は空中線２１で受信した電波を復
調する１系の受信機(1) 、１２は空中線２２で受信した
電波を復調する２系の受信機(2) 、４１は受信機(1) １
１から出力される受信電界出力をある一定時間単位で連
続して監視し、各一定時間内におけるピーク値を検出す
るピーク検出器(1) 、４２は受信機(2) １２から出力さ
れる受信電界出力を前記同様にある一定時間単位で連続
して監視し、各一定時間内におけるピーク値を検出する
ピーク検出器(2) 、２はピーク検出器(1) ４１およびピ
ーク検出器(2) ４２の出力（値）の差を所定値と比較す
る比較器、１３は比較器２の出力より空中線の障害を検
出する第１の障害検出器である。また、１は変調入力を
送信出力に変換する送信機である。FIG. 5 shows an antenna obstacle detecting apparatus according to the fourth embodiment of the present invention. In the figure, 21 and 22 are antennas (1) prepared for two systems for diversity reception,
(2), 31 and 32 switch the antennas 21 and 22 at the time of reception and at the time of transmission to connect to the transmitter and the receiver (1), (2) and 11 indicate the radio waves received by the antenna 21. 1-system receiver (1) for demodulation, 12 is a 2-system receiver (2) for demodulating the radio wave received by the antenna 22, 41 is a receiver (1) 1
The peak detectors (1) and 42, which continuously monitor the output of the received electric field from the unit 1 in a certain time unit and detect the peak value within each certain time, are the receivers (2) 12 output from the receiver. A peak detector (2) that continuously monitors the electric field output in a certain fixed time unit and detects the peak value within each fixed time, 2 is a peak detector (1) 41 and a peak detector (2) A comparator that compares the difference between the outputs (values) of 42 and a predetermined value, and 13 is a first fault detector that detects a fault in the antenna from the output of the comparator 2. Further, 1 is a transmitter for converting a modulation input into a transmission output.
【００３８】以上の構成は図１と同様のものである。５
は送信機１と送受切替機３１および３２との間に設けら
れ、送信機１の送信出力の一部を取り出す結合器、６は
結合器５を介して送信機１から空中線へ出力される信号
のうち空中線からの反射成分を検出する反射検出器、７
は反射検出器６の出力から空中線２１あるいは２２に障
害が発生したか否かを検出する第２の障害検出器であ
る。The above construction is similar to that of FIG. 5
Is a coupler provided between the transmitter 1 and the transmission / reception switching units 31 and 32, and 6 is a coupler for extracting a part of the transmission output of the transmitter 1, and 6 is a signal output from the transmitter 1 to the antenna via the coupler 5. A reflection detector for detecting the reflection component from the antenna,
Is a second fault detector which detects from the output of the reflection detector 6 whether or not a fault has occurred in the antenna 21 or 22.
【００３９】次に動作について説明する。即ち、受信時
には空中線(1) ２１が受信機(1) １１に、また空中線
(2) ２２が受信機(2) １２に接続されるように、送受切
替器(1) ３１および送受切替器(2)３２が動作し、受信
信号は空中線(1) ２１および空中線(2) ２２を経て受信
機(1) １１および受信機(2) １２により同時に受信され
る。そして、この２つの受信機１１および１２の受信出
力は図示しない比較器により比較され、当該比較器によ
り受信電界の強い方の空中線および受信機からの信号、
即ち復調出力(1) または復調出力(2) のいずれかが図示
しない選択器によって選択されるように、送受切替器
(1) ３１および送受切替器(2) ３２が選択され、ダイバ
ーシティ受信される。Next, the operation will be described. That is, at the time of reception, the antenna (1) 21 becomes the receiver (1) 11 and
(2) The transmission / reception switching device (1) 31 and the transmission / reception switching device (2) 32 operate so that 22 is connected to the receiver (2) 12, and the reception signal is the antenna (1) 21 and the antenna (2). It is simultaneously received by the receiver (1) 11 and the receiver (2) 12 via 22. Then, the reception outputs of the two receivers 11 and 12 are compared by a comparator (not shown), and by the comparator, the antenna and the signal from the receiver having a stronger reception electric field,
That is, either the demodulation output (1) or the demodulation output (2) is selected by a selector (not shown),
(1) 31 and the duplexer (2) 32 are selected and diversity reception is performed.
【００４０】このとき、ピーク検出器(1) ４１およびピ
ーク検出器(2）４２において、受信機(1) １１および受
信機(2）１２の受信電界出力をそれぞれ一定時間単位で
連続して監視している。このピーク検出器の動作をピー
ク検出器(1) ４１を例にとって説明すると、まず、サン
プリング回路４１ａにより受信機(1) １１の出力が一定
間隔のサンプリングタイミングでサンプリングされ、こ
れが記憶回路４１ｂにて一定時間分記憶される。この一
定時間分記憶された受信電界出力の最大値が最大値検出
回路４１ｃで検出される。At this time, in the peak detector (1) 41 and the peak detector (2) 42, the received electric field outputs of the receiver (1) 11 and the receiver (2) 12 are continuously monitored in fixed time units. is doing. The operation of the peak detector will be described by taking the peak detector (1) 41 as an example. First, the output of the receiver (1) 11 is sampled by the sampling circuit 41a at a sampling timing at regular intervals, and this is stored in the storage circuit 41b. It is stored for a certain period of time. The maximum value of the received electric field output stored for this fixed time is detected by the maximum value detection circuit 41c.
【００４１】このようにして検出された一定時間内にお
ける受信電界のピーク値は、この場合空中線(1）２１お
よび空中線(2) ２２に障害が発生していないので、その
一定時間内における受信電界出力（値）のピークＡ（ｄ
ＢμＶ），ピークＢ（ｄＢμＶ）の差は障害検出時のよ
うに大きくなることはない。In this case, the peak value of the received electric field detected within the fixed time is the received electric field within the fixed time because the antenna (1) 21 and the antenna (2) 22 are not damaged in this case. Output (value) peak A (d
The difference between B μV) and peak B (dB μV) does not become large unlike when a failure is detected.
【００４２】従って、比較器２においてピーク検出器
(1) ４１およびピーク検出器(2) ４２の出力の差を所定
値を比較しその比較結果を障害検出器３に入力しても障
害が検出された旨の信号は出力されない。Therefore, in the comparator 2, the peak detector
Even if the difference between the outputs of (1) 41 and the peak detector (2) 42 is compared with a predetermined value and the comparison result is input to the fault detector 3, a signal indicating that the fault is detected is not output.
【００４３】次に空中線に障害が発生した場合の動作に
ついて説明する。 （Ｉ）空中線(2) ２２に障害が発生し空中線(1) ２１は
正常な場合 受信信号は空中線(1) ２１を経由し受信機(1) １１にて
受信され、ピーク検出器(1) ４１によりその受信電界出
力を一定時間単位で連続して監視し各一定時間内におけ
る受信電界出力（値）のピークをＡ（ｄＢμＶ）とす
る。一方、前記と同様に受信信号は空中線(2) ２２を経
由し受信機(2) １２にて受信され、ピーク検出器(2) ４
２によりその受信電界を一定時間単位で連続して監視し
各一定時間内における受信電界出力（値）のピークをＢ
（ｄＢμＶ）とする。このとき、空中線(2) ２２は障害
が発生しているため利得が空中線(1) ２１より低く、利
得が低い分受信電界出力（値）ＢはＡより小さくなる。
（II）空中線(1) ２１に障害が発生し空中線(2) ２２は
正常な場合、（Ｉ）と同様な動作により、結果として受
信電界出力（値）ＡはＢより小さくなる。Next, the operation when a failure occurs in the antenna will be described. (I) When the antenna (2) 22 fails and the antenna (1) 21 is normal The received signal is received by the receiver (1) 11 via the antenna (1) 21 and the peak detector (1) The output of the received electric field is continuously monitored by the unit 41 by a constant time unit, and the peak of the received electric field output (value) within each constant time is set to A (dBμV). On the other hand, similarly to the above, the received signal is received by the receiver (2) 12 via the antenna (2) 22 and the peak detector (2) 4
2, the received electric field is continuously monitored in constant time units, and the peak of the received electric field output (value) within each constant time is B
(DB μV). At this time, since the antenna (2) 22 has a failure, the gain is lower than that of the antenna (1) 21, and the received electric field output (value) B is smaller than A because the gain is low.
(II) When the antenna (1) 21 fails and the antenna (2) 22 is normal, the same operation as (I) results in the received electric field output (value) A being smaller than B.
【００４４】次に受信電界出力（値）ＡおよびＢは比較
器２において比較され、この出力は障害検出器３へ送出
され、ここで空中線(1) ２１または空中線(2) ２２の障
害判定が行われる。すなわち、受信電界出力（値）の差
の絶対値が例えば２０ないし３０ｄＢ等のある一定値以
上となった場合、前記比較器２はこの差を所定値と比較
して所定値よりも大きい旨を出力し、第１の障害検出器
１３は受信電界出力（値）ＡおよびＢの差の符号に応じ
て前記出力（値）の小さい方（ＡまたはＢ）を出力する
受信機に接続された空中線を障害と判断する。Next, the received electric field outputs (values) A and B are compared in the comparator 2, and this output is sent to the fault detector 3, where the fault judgment of the antenna (1) 21 or the antenna (2) 22 is performed. Done. That is, when the absolute value of the difference in the output (value) of the received electric field exceeds a certain fixed value such as 20 to 30 dB, the comparator 2 compares this difference with the predetermined value and indicates that the difference is larger than the predetermined value. The first fault detector 13 outputs and outputs the one (A or B) having the smaller output (value) depending on the sign of the difference between the received electric field outputs (values) A and B. The antenna connected to the receiver. Is judged as an obstacle.
【００４５】これに対し、上述のように、両空中線が正
常動作し受信電界出力（値）の差がある一定値以下の場
合、本障害検出機能は障害がある旨の信号は出力しな
い。On the other hand, as described above, when both antennas operate normally and the difference in the received electric field output (value) is less than a certain value, this fault detection function does not output a signal indicating that there is a fault.
【００４６】このように、空中線１および空中線２が正
常な受信時の動作は従来例および本発明の第１の実施例
の場合と同様である。As described above, the operation at the time of normal reception of the antenna 1 and the antenna 2 is the same as in the conventional example and the first embodiment of the present invention.
【００４７】これに対し、送信時には送信機１が空中線
(1) ２１または空中線(2) ２２に一定周期で交互に切替
えてそのいずれか一方に交互に接続されるように、送受
切替器(1) ３１および送受切替器(2) ３２が動作し、送
信出力が送出される。このとき、送信を行なっている空
中線に障害が発生した場合、障害が発生した空中線のＶ
ＳＷＲ（Voltage Standing Wave Ratio:電圧定在波比）
は悪化しているため、本空中線を経由して送信される送
信出力はすべてが空中線から送出されるとは限らず、送
信機１側へ戻る反射波信号が生じる。On the other hand, when transmitting, the transmitter 1
(1) The transmission / reception switching device (1) 31 and the transmission / reception switching device (2) 32 operate so that they are alternately switched to the 21 or the antenna (2) 22 at a constant cycle and are alternately connected to either one of them. The transmission output is sent. At this time, if a failure occurs in the transmitting antenna, V of the failed antenna is generated.
SWR (Voltage Standing Wave Ratio)
Since all the transmission outputs transmitted via the main antenna are not transmitted from the antenna, a reflected wave signal returning to the transmitter 1 side is generated.
【００４８】この反射波を結合器５より取り出し、反射
検出器６により障害空中線がある一定以上のＶＳＷＲと
なった時、第２の障害検出器７にて空中線に障害がある
と判断する。すなわち、軽度の障害であればＶＳＷＲが
例えば６程度、障害の度合いが大きい場合は例えば１０
以上のＶＳＷＲとなるので、この値以上になった時に障
害が発生したと判定する。This reflected wave is extracted from the coupler 5, and when the reflection detector 6 has a VSWR above a certain level, the second fault detector 7 determines that there is a fault in the antenna. That is, the VSWR is, for example, about 6 for a minor failure, and is 10 for a large failure.
Since the above VSWR is obtained, it is determined that a failure has occurred when the VSWR is exceeded.
【００４９】このように、上記実施例によれば、受信時
においては２つの系統の受信機のそれぞれにおいてその
受信電界のピーク値を一定時間単位で連続して求め、そ
の差が所定値を越えるか否かによって空中線に障害が生
じているか否かを判定するとともに送信時においては反
射波の電圧定在波比が一定以上となるか否かによって空
中線に障害が生じているか否かを判定するようにしたの
で、通常の受信動作中にこれと平行して障害検出を行な
うことができ、運用に支障をきたしたり回線品質の劣化
を招いたりすることなくリアルタイムで空中線の障害を
検出することができる。また、送信時に障害検出を行な
うのではなく受信時にこれを行なうので、不必要な送信
を行うことがなく他の通信に妨害を与えることがない。
しかも障害検出のために特別な送信機等を用意する必要
がなく受信機自体で空中線の障害の有無を検出すること
ができる、という本発明の第１の実施例の効果が得られ
るのみならず、送信中も受信中もいずれかの障害検出回
路が動作しているため、監視状態が途切れることなく障
害検出が可能になる、という効果がある。As described above, according to the above-described embodiment, at the time of reception, the peak value of the received electric field is continuously obtained in a constant time unit in each of the receivers of the two systems, and the difference exceeds the predetermined value. It is determined whether or not there is a failure in the antenna, and at the time of transmission it is determined whether or not there is a failure in the antenna depending on whether the voltage standing wave ratio of the reflected wave is above a certain level. As a result, fault detection can be performed in parallel with normal reception operations, and faults in the antenna can be detected in real time without hindering operation or degrading line quality. it can. Further, since the failure detection is not performed at the time of transmission but is performed at the time of reception, unnecessary transmission is not performed and interference is not given to other communication.
Moreover, it is not only possible to obtain the effect of the first embodiment of the present invention that the receiver itself can detect the presence or absence of an obstacle in the antenna without the need to prepare a special transmitter or the like for detecting the obstacle. Since any one of the failure detection circuits operates during transmission and reception, there is an effect that the failure can be detected without interruption of the monitoring state.
【００５０】なお、上記実施例では、受信機出力の受信
電界出力をある一定時間単位で連続して監視することに
よりダイバーシティ無線機を運用中、スタンディング等
の受信電界の瞬時変動による誤検出を防止するようにし
たが、一定時間内の監視を行わずフェージングの毎サイ
クルごとのピーク値を求めてもよい。In the above embodiment, the reception electric field output of the receiver output is continuously monitored at a constant time unit to prevent erroneous detection due to an instantaneous fluctuation of the reception electric field such as standing during operation of the diversity radio. However, the peak value for each cycle of fading may be obtained without monitoring within a certain period of time.
【００５１】実施例５．なお、上記第４の実施例では、
ダイバーシティ無線機で空中線が直接接続された場合に
ついて説明したが、ダイバーシティ無線機と空中線の間
に伝送回路等の他の回路が挿入された場合も同様の効果
を奏する。Example 5. In the fourth embodiment,
Although the case where the antenna is directly connected by the diversity radio has been described, the same effect can be obtained when another circuit such as a transmission circuit is inserted between the diversity radio and the antenna.
【００５２】図６はこのように、ダイバーシティ無線機
と空中線の間に伝送回路等の他の回路が挿入された本発
明の第５の実施例を示す。図６において、５１および５
２は送受切替機(1) ３１と空中線(1) ２１との間および
送受切替器(2) ３２と空中線(2) ２２との間にそれぞれ
が挿入され能動素子を使用した回路（増幅器等）あるい
は受動素子を使用した回路（切替器，ケーブル等）等か
らなる伝送回路である。FIG. 6 shows a fifth embodiment of the present invention in which another circuit such as a transmission circuit is inserted between the diversity radio and the antenna as described above. In FIG. 6, 51 and 5
2 is a circuit (amplifier, etc.) using active elements, which are respectively inserted between the transmission / reception switcher (1) 31 and the antenna (1) 21 and between the transmission / reception switcher (2) 32 and the antenna (2) 22. Alternatively, it is a transmission circuit including a circuit (switch, cable, etc.) using passive elements.
【００５３】この実施例においても、実施例４と同様の
動作によって、空中線の障害検出が可能となる。また、
この実施例の場合、伝送回路５１および５２に障害があ
る場合にその検出が可能になることは言うまでもない。Also in this embodiment, it is possible to detect an obstacle in the antenna by the same operation as in the fourth embodiment. Also,
In the case of this embodiment, it goes without saying that if there is a failure in the transmission circuits 51 and 52, it can be detected.
【００５４】実施例６．また、上記第４の実施例ではダ
イバーシティ無線機において受信機が２台の場合につい
て説明したが、受信機が２台以上の複数台の場合でも同
様の効果を奏する。Example 6. Further, in the fourth embodiment, the case where there are two receivers in the diversity radio device has been described, but the same effect can be obtained even when there are two or more receivers.
【００５５】図７はこのように受信機が２台以上の複数
台を設けた本発明の第６の実施例を示す。図４におい
て、２１ないし２ｎはダイバーシティ受信のためにｎ系
統用意された空中線(1) ないし空中線(n) 、１１ないし
１ｎは受信機(1) １１，受信機(2) １２と同様の機能を
持つ受信機(1) ないし受信機(n) 、４１ないし４ｎはピ
ーク検出回路(1) ４１，ピーク検出回路(2) ４２と同等
の機能を持つピーク検出回路(1) ないしピーク検出回路
(n) 、４はこれらの複数のピーク検出回路４１〜４ｎの
うち最大の値と他の値との差、それぞれを所定の値と比
較する比較器である。FIG. 7 shows a sixth embodiment of the present invention in which two or more receivers are provided as described above. In FIG. 4, 21 to 2n are antennas (1) to antennas (n) prepared for n systems for diversity reception, and 11 to 1n are the same functions as the receiver (1) 11 and the receiver (2) 12. The receivers (1) to (n), 41 to 4n are the peak detection circuit (1) 41 and the peak detection circuit (2) 42 having the same functions as the peak detection circuit (1) 41 and the peak detection circuit (2) 42.
(n) 4 is a comparator for comparing the difference between the maximum value and the other value among the plurality of peak detection circuits 41 to 4n with a predetermined value.
【００５６】比較器４ではｎ個のピーク検出回路の出力
のうち最大のものと他のものとを比較し、そのうちの例
えば１つが最大のピーク検出回路の出力値と比較して例
えば２０ないし３０ｄＢ等の一定値以上の差（低下）が
ある場合、本ピーク検出回路に接続された受信機の系の
空中線を障害と判断する。The comparator 4 compares the maximum output of the n peak detection circuits with another output, and one of them compares with the output value of the maximum peak detection circuit, for example, 20 to 30 dB. If there is a difference (decrease) of a certain value or more, the antenna of the system of the receiver connected to this peak detection circuit is judged to be a failure.
【００５７】[0057]
【発明の効果】以上のように、この発明に係る空中線障
害検出装置によれば、ダイバーシティ無線機を構成する
複数の受信機のそれぞれの受信電界出力（値）のピーク
値を検出し、この複数のピーク検出結果の差を所定値と
比較し、この比較結果により前記それぞれの受信機に接
続された空中線の障害の有無を実時間で検出するように
したので、空中線の障害を受信系のみでリアルタイムで
判定できるという効果がある。As described above, according to the antenna obstacle detecting apparatus of the present invention, the peak value of the received electric field output (value) of each of the plurality of receivers constituting the diversity radio device is detected, The difference between the peak detection results is compared with a predetermined value, and the presence or absence of a fault in the antenna connected to each of the receivers is detected in real time based on this comparison result. The effect is that it can be judged in real time.
【００５８】また、この発明に係る空中線障害検出装置
によれば、ダイバーシティ無線機を構成する複数の受信
機のそれぞれの受信電界出力（値）のピーク値を検出
し、この複数のピーク検出結果の差を所定値と比較し、
この比較結果により前記それぞれの受信機に接続された
空中線の障害の有無を実時間で検出するとともに、ダイ
バーシティ無線機を構成する送信機の送信出力の空中線
からの反射成分を検出し、この反射検出結果によりそれ
ぞれの受信機に接続された空中線の障害の有無を検出す
るようにしたので、受信時に空中線の障害を受信系のみ
でリアルタイムで判定できるのみならず、送信時におい
てもその障害検出が可能になり、監視状態が途切れるの
を防止できるという効果がある。Further, according to the antenna obstacle detecting apparatus of the present invention, the peak value of the received electric field output (value) of each of the plurality of receivers constituting the diversity radio device is detected, and the plurality of peak detection results are detected. Compare the difference to a given value,
Based on the result of this comparison, the presence or absence of an obstacle in the antenna connected to each of the receivers is detected in real time, and the reflection component from the antenna of the transmission output of the transmitter that constitutes the diversity radio is detected, and this reflection detection is performed. Since the presence or absence of a failure in the antenna connected to each receiver is detected based on the result, not only can the failure of the antenna be determined in real time at the time of reception, but it can also be detected at the time of transmission. Therefore, it is possible to prevent the monitoring state from being interrupted.
【図１】この発明の一実施例による空中線障害検出装置
のブロック図である。FIG. 1 is a block diagram of an antenna obstacle detection device according to an embodiment of the present invention.
【図２】図１のピーク検出器の構成例を示すブロック図
である。FIG. 2 is a block diagram showing a configuration example of the peak detector of FIG.
【図３】この発明の第２の実施例による空中線障害検出
装置のブロック図である。FIG. 3 is a block diagram of an antenna obstacle detecting device according to a second embodiment of the present invention.
【図４】この発明の第３の実施例による空中線障害検出
装置のブロック図である。FIG. 4 is a block diagram of an antenna obstacle detecting device according to a third embodiment of the present invention.
【図５】この発明の第４の実施例による空中線障害検出
装置のブロック図である。FIG. 5 is a block diagram of an antenna obstacle detecting device according to a fourth embodiment of the present invention.
【図６】この発明の第５の実施例による空中線障害検出
装置のブロック図である。FIG. 6 is a block diagram of an antenna obstacle detecting device according to a fifth embodiment of the present invention.
【図７】この発明の第５の実施例による空中線障害検出
装置のブロック図である。FIG. 7 is a block diagram of an antenna obstacle detecting device according to a fifth embodiment of the present invention.
【図８】従来の空中線障害検出装置のブロック図であ
る。FIG. 8 is a block diagram of a conventional antenna obstacle detection device.
１ 送信機 ２ 比較器 ３ 障害検出器 ５ 結合器 ６ 反射検出器 ７ 第２の障害検出器 １１ １系の受信機 １２ ２系の受信機 １３ 第１の障害検出器 ２１ 空中線 ２２ 空中線 ３１ 送受切替器（１） ３２ 送受切替器（２） ４１ ピーク検出器（１） ４２ ピーク検出器（２） 1 transmitter 2 comparator 3 fault detector 5 coupler 6 reflection detector 7 second fault detector 11 1 system receiver 12 2 system receiver 13 first fault detector 21 aerial line 22 aerial line 31 transmission / reception switching Device (1) 32 Transmission / reception switching device (2) 41 Peak detector (1) 42 Peak detector (2)
Claims (2)
空中線と、 この空中線のそれぞれに１台ずつ接続された複数の受信
機と、 該複数の受信機のそれぞれの受信電界出力（値）のピー
ク値を検出する複数のピーク検出回路と、 該複数のピーク検出回路のピーク検出結果の差を所定値
と比較する比較器と、 該比較器出力により前記それぞれの受信機に接続された
空中線の障害の有無を検出する障害検出器とを備えたこ
とを特徴とする空中線障害検出装置。1. A plurality of antennas constituting a diversity radio, a plurality of receivers connected to each of the antennas, and a peak value of a received electric field output (value) of each of the plurality of receivers. A plurality of peak detection circuits, a comparator for comparing the difference between the peak detection results of the plurality of peak detection circuits with a predetermined value, and a comparator output for checking the disturbance of the antenna connected to each of the receivers. An antenna obstacle detecting device, comprising: an obstacle detector for detecting the presence or absence of the antenna.
空中線と、 この空中線のそれぞれに１台ずつ接続された複数の受信
機と、 該複数の受信機のそれぞれの受信電界出力（値）のピー
ク値を検出する複数のピーク検出回路と、 該複数のピーク検出回路のピーク検出結果の差を所定値
と比較する比較器と、 該比較器の出力により上記それぞれの受信機に接続され
た空中線の障害の有無を検出する第１の障害検出器と、 ダイバーシティ無線機を構成する送信機と、 該送信機の送信出力の上記空中線からの反射成分を検出
する反射検出器と、 該反射検出器の出力により上記それぞれの受信機に接続
された空中線の障害の有無を検出する第２の障害検出器
とを備えたことを特徴とする空中線障害検出装置。2. A plurality of antennas forming a diversity radio, a plurality of receivers connected to each of the antennas, and a peak value of a received electric field output (value) of each of the plurality of receivers. A plurality of peak detection circuits, a comparator for comparing a difference between peak detection results of the plurality of peak detection circuits with a predetermined value, and an obstacle of an antenna connected to each of the receivers by the output of the comparator. A first fault detector for detecting the presence or absence of a signal, a transmitter constituting a diversity radio, a reflection detector for detecting a reflection component of the transmission output of the transmitter from the antenna, and an output of the reflection detector And a second fault detector for detecting the presence / absence of a fault in the antenna connected to each of the above-mentioned receivers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5064553A JPH06276166A (en) | 1993-03-24 | 1993-03-24 | Antenna fault detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5064553A JPH06276166A (en) | 1993-03-24 | 1993-03-24 | Antenna fault detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06276166A true JPH06276166A (en) | 1994-09-30 |
Family
ID=13261538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5064553A Pending JPH06276166A (en) | 1993-03-24 | 1993-03-24 | Antenna fault detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06276166A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6058297A (en) * | 1995-03-15 | 2000-05-02 | Ab Volvo | Radio receiver for vehicle use |
| US6188879B1 (en) | 1998-01-14 | 2001-02-13 | Nec Corporation | System and method of testing overall and individual antennas of a switched space diversity receiver |
| US6253067B1 (en) | 1997-06-27 | 2001-06-26 | Nec Corporation | Transmitter/receiver having an antenna failure detection system |
| WO2005022787A1 (en) * | 2003-08-21 | 2005-03-10 | Daimlerchrysler Ag | Diagnostic device and method for a multi-antenna system |
| JP2007208797A (en) * | 2006-02-03 | 2007-08-16 | Oki Electric Ind Co Ltd | Failure detecting apparatus |
| CN107534497A (en) * | 2016-03-31 | 2018-01-02 | 华为技术有限公司 | The fault detection method and fault test set of a kind of external antenna |
-
1993
- 1993-03-24 JP JP5064553A patent/JPH06276166A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6058297A (en) * | 1995-03-15 | 2000-05-02 | Ab Volvo | Radio receiver for vehicle use |
| US6253067B1 (en) | 1997-06-27 | 2001-06-26 | Nec Corporation | Transmitter/receiver having an antenna failure detection system |
| US6188879B1 (en) | 1998-01-14 | 2001-02-13 | Nec Corporation | System and method of testing overall and individual antennas of a switched space diversity receiver |
| WO2005022787A1 (en) * | 2003-08-21 | 2005-03-10 | Daimlerchrysler Ag | Diagnostic device and method for a multi-antenna system |
| JP2007208797A (en) * | 2006-02-03 | 2007-08-16 | Oki Electric Ind Co Ltd | Failure detecting apparatus |
| JP4735295B2 (en) * | 2006-02-03 | 2011-07-27 | 沖電気工業株式会社 | Failure detection device |
| CN107534497A (en) * | 2016-03-31 | 2018-01-02 | 华为技术有限公司 | The fault detection method and fault test set of a kind of external antenna |
| CN107534497B (en) * | 2016-03-31 | 2020-06-09 | 华为技术有限公司 | Fault detection method and fault detection equipment for external antenna |
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