JPH0376055B2 - - Google Patents
Info
- Publication number
- JPH0376055B2 JPH0376055B2 JP57062144A JP6214482A JPH0376055B2 JP H0376055 B2 JPH0376055 B2 JP H0376055B2 JP 57062144 A JP57062144 A JP 57062144A JP 6214482 A JP6214482 A JP 6214482A JP H0376055 B2 JPH0376055 B2 JP H0376055B2
- Authority
- JP
- Japan
- Prior art keywords
- antenna
- pilot signal
- limiter
- transmission
- circuit
- 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.)
- Expired - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/15—Performance testing
- H04B17/17—Detection of non-compliance or faulty performance, e.g. response deviations
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Emergency Alarm Devices (AREA)
- Details Of Aerials (AREA)
- Transceivers (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Description
【発明の詳細な説明】
この発明は、空中線の異常から送受信機を保護
するための空中線異常警報回路に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an antenna abnormality warning circuit for protecting a transmitter/receiver from abnormalities in the antenna.
従来のこの種の装置として第１図に示すものが
あつた。図において、１は空中線、２は方向性結
合器、３は送受切換器で、これはサーキユレータ
でもよい。４は送信機、５は高周波増幅器、６お
よび９は切換回路、７は検波器、８は受信機、１
０はパイロツト信号発生器、１１は空中線１の異
常を判定する制御回路である。 A conventional device of this type is shown in FIG. In the figure, 1 is an antenna, 2 is a directional coupler, and 3 is a transmission/reception switch, which may also be a circulator. 4 is a transmitter, 5 is a high frequency amplifier, 6 and 9 are switching circuits, 7 is a detector, 8 is a receiver, 1
0 is a pilot signal generator, and 11 is a control circuit for determining an abnormality in the antenna 1.
次の動作について説明する。 The following operation will be explained.
空中線１の異常を検出する場合は、切換回路９
および６により、パイロツト信号発生器１０およ
び検波器７を接続する。すると、パイロツト信号
発生器１０から出力された信号は、切換回路９お
よび方向性結合器２を介して空中線１に送られ、
空中線１で反射された信号は方向性結合器２、送
受切換器３、高周波増幅器５、切換回路６を経て
検波器７および制御回路１１に出力される。従つ
てこの制御回路１１において検波器７の検波レベ
ルの大小により空中線１の反射電力の大小を知
り、空中線１の異常を検出することができる。 When detecting an abnormality in antenna 1, switch circuit 9
and 6 connect the pilot signal generator 10 and the detector 7. Then, the signal output from the pilot signal generator 10 is sent to the antenna 1 via the switching circuit 9 and the directional coupler 2.
The signal reflected by the antenna 1 is output to a detector 7 and a control circuit 11 via a directional coupler 2, a transmission/reception switch 3, a high frequency amplifier 5, and a switching circuit 6. Therefore, in this control circuit 11, the magnitude of the reflected power of the antenna 1 can be determined based on the magnitude of the detection level of the wave detector 7, and an abnormality in the antenna 1 can be detected.
従来の空中線異常警報回路は以上のように構成
されているので、レーダ運行前に空中線のチエツ
クをしなければならず、運行中のチエツクは不可
能であつた。また検波器７の異常時にもその異常
を検出できなくてシステムとしてフエイルセイフ
とはなつておらず、高周波増幅器５の安定度によ
つては誤動作することがあり、さらに受信系に切
換回路が入つているため雑音指数が悪化する等の
欠点があつた。 Since the conventional antenna abnormality warning circuit is constructed as described above, it is necessary to check the antenna before radar operation, and it is impossible to check the antenna during operation. Furthermore, even if the detector 7 has an abnormality, the abnormality cannot be detected, so the system is not fail-safe, and depending on the stability of the high-frequency amplifier 5, it may malfunction. This resulted in drawbacks such as a worsening of the noise figure.
この発明は上記のような従来のものの欠点を除
去するためになされたもので、送信信号の反射電
力を利用し、受信系によつて空中線の異常検出を
することにより、レーダ運用中に異常検出がで
き、かつフエイルセイフな空中線異常警報回路を
提供することを目的としている。 This invention was made in order to eliminate the above-mentioned drawbacks of the conventional system. By using the reflected power of the transmitted signal and detecting abnormalities in the antenna by the receiving system, it is possible to detect abnormalities during radar operation. The purpose of the present invention is to provide a fail-safe antenna abnormality alarm circuit.
以下、この発明の一実施例を図について説明す
る。 An embodiment of the present invention will be described below with reference to the drawings.
第２図は本発明の一実施例による空中線異常警
報回路を示す。図において、１は空中線、２は方
向性結合器、３はサーキユレータ又は送受切換
器、４はサーキユレータ又は送受切換器３、及び
方向性結合器２を介して空中線１に送信信号を供
給する送信機、１０は方向性結合器２を介して空
中線１にパイロツト信号を供給するパイロツト信
号発生器、１３は送信信号の送信直後に上記パイ
ロツト信号を発生させるパイロツト信号制御回
路、１２は送受切換器３と受信系１４との間に接
続され送信時該受信系１４を保護するためのリミ
ツタである。また受信系１４において５は高周波
増幅器、７は検波器、１１ａはパイロツト信号の
発生直後からリミツタ１２が飽和状態から回復す
るまでの時間を測定しこれを設定値と比較して空
中線１の異常を判定する異常判定回路、８は受信
信号を処理する受信機である。 FIG. 2 shows an antenna abnormality alarm circuit according to an embodiment of the present invention. In the figure, 1 is an antenna, 2 is a directional coupler, 3 is a circulator or a transmitter/receiver switch, 4 is a circulator or a transmitter/receiver switcher 3, and a transmitter that supplies a transmission signal to the antenna 1 via the directional coupler 2. , 10 is a pilot signal generator that supplies a pilot signal to the antenna 1 via the directional coupler 2, 13 is a pilot signal control circuit that generates the pilot signal immediately after transmitting the transmission signal, and 12 is a transmitting/receiving switch 3. This is a limiter connected between the receiving system 14 and protecting the receiving system 14 during transmission. In the receiving system 14, 5 is a high frequency amplifier, 7 is a wave detector, and 11a measures the time from immediately after the pilot signal is generated until the limiter 12 recovers from saturation, and compares this with a set value to detect an abnormality in the antenna 1. An abnormality determination circuit 8 is a receiver that processes the received signal.
第３図は上記回路のタイミングチヤートを示
し、図において、ａは送信タイミング、ｂはパイ
ロツト信号発生タイミング、ｃは空中線正常時に
おける検波器７の検波出力、ｄは空中線異常時に
おける検波器７の検波出力であり、τ0は送信パル
ス幅、τ1はパイロツト信号パルス幅、τ2，τ4は空
中線正常、異常時におけるリミツタ１２の回復時
間、τ3は異常判定回路１１ａに設定されている判
定時間である。 FIG. 3 shows a timing chart of the above circuit, in which a is the transmission timing, b is the pilot signal generation timing, c is the detection output of the detector 7 when the antenna is normal, and d is the output of the detector 7 when the antenna is abnormal. It is the detection output, τ 0 is the transmission pulse width, τ 1 is the pilot signal pulse width, τ 2 and τ 4 are the recovery time of the limiter 12 when the antenna is normal or abnormal, and τ 3 is set in the abnormality judgment circuit 11a. It is judgment time.
次に動作について説明する。 Next, the operation will be explained.
送信時送信機４から出力された送信電力はサー
キユレータ又は送受切換器３、方向性結合器２を
経て空中線１に至る。そしてこの空中線１からの
反射電力は方向性結合器２、サーキユレータ３を
経てリミツタ１２に印加され、その結果送信中リ
ミツタ１２は飽和状態になつている。これは該リ
ミツタ１２には一定以上の電力が入力すると、飽
和状態になつてその出力を制限するという保護機
能があるからであるが、このような飽和状態にあ
る状態から上記一定以上の電力入力がなくなつた
ときの該リミツタ１２の回復時間は上記入力電力
に比例する。 During transmission, the transmission power output from the transmitter 4 reaches the antenna 1 via a circulator or transmitter/receiver switch 3 and a directional coupler 2. The reflected power from the antenna 1 is applied to the limiter 12 via the directional coupler 2 and the circulator 3, and as a result, the limiter 12 is in a saturated state during transmission. This is because the limiter 12 has a protection function that, when power is input above a certain level, it enters a saturated state and limits its output. The recovery time of the limiter 12 when the limiter 12 runs out is proportional to the input power.
一方送信が完了すると同時にパイロツト信号を
パイロツト信号発生器１０から発生すると、パイ
ロツト信号は方向性結合器２を経てリミツタ１２
に至るが、この時リミツタ１２は飽和状態にある
ため、アツテネータとして機能する。そのためパ
イロツト信号はリミツタ１２の回復時間の間リミ
ツタ１２に阻止されることとなるが、このリミツ
タ１２の回復時間は空中線１からの反射電力によ
り決定されるため、該空中線１の正常時には反射
電力が小さく、回復時間はτ2となる。一方空中線
１の異常時には反射電力が大きく、回復時間はτ4
となる。従つて高周波増幅器５を経て検波器７の
出力として現われる波形は正常時、異常時それぞ
れ第３図ｃ，ｄの様になり、異常判定回路１１ａ
でτ3を判定時間として設定しておけば、リミツタ
１２が回復するまで、即ち検波レベルVlを出力す
るまでの時間τ2又はτ4を該τ3と比較することによ
り空中線１の正常、異常を検出できる。なお同図
中の信号ｃにおいてリミツタ１２が飽和状態から
回復したあと出力する上記検波レベルVlはリミツ
タ１２の飽和状態（送信中）における検波レベル
Vsより多少小さい値となつている。また図中の
信号ｄにおける破線はパイロツト信号がτ1より長
く続いたとしたときのリミツタ１２の出力波形を
示す。 On the other hand, when the pilot signal is generated from the pilot signal generator 10 at the same time as the transmission is completed, the pilot signal passes through the directional coupler 2 and is sent to the limiter 12.
However, since the limiter 12 is in a saturated state at this time, it functions as an attenuator. Therefore, the pilot signal is blocked by the limiter 12 during the recovery time of the limiter 12, but since the recovery time of the limiter 12 is determined by the reflected power from the antenna 1, when the antenna 1 is normal, the reflected power is is small, and the recovery time is τ 2 . On the other hand, when antenna 1 is abnormal, the reflected power is large and the recovery time is τ 4
becomes. Therefore, the waveforms that appear as the output of the detector 7 after passing through the high frequency amplifier 5 are as shown in FIG.
If τ 3 is set as the determination time, the normality of the antenna 1 can be determined by comparing the time τ 2 or τ 4 until the limiter 12 recovers, that is, until it outputs the detection level V l , with τ 3 . Abnormalities can be detected. In addition, in the signal c in the figure, the detection level V l outputted after the limiter 12 recovers from the saturated state is the detection level when the limiter 12 is in the saturated state (during transmission).
The value is somewhat smaller than V s . Furthermore, the broken line in the signal d in the figure shows the output waveform of the limiter 12 when the pilot signal continues longer than τ 1 .
以上のように、この発明によれば、受信系を保
護するリミツタを用い、送信信号の反射信号を利
用して空中線の異常検出を行なうように構成した
ので、送信機の運用中にも異常検出を行なうこと
ができる。また受信系そのものを利用し、パイロ
ツト信号が検出できなくなる状態で異常を検出す
るため、高周波回路から検波回路までのいずれの
回路の異常に対してもフエイルセイフに動作す
る。 As described above, according to the present invention, the limiter that protects the receiving system is used and the reflected signal of the transmitted signal is used to detect abnormalities in the antenna. can be done. Furthermore, since the reception system itself is used to detect an abnormality in a state where the pilot signal cannot be detected, it operates fail-safely against abnormalities in any circuit from the high frequency circuit to the detection circuit.
さらに、試験信号回路をすでに装備しているシ
ステムであれば、高価なマイクロ波部品を何一つ
追加することなく、制御系の変更と低い周波数帯
における安価な検波回路の追加のみで実施できる
ので、装置が安価にでき、信頼性を向上できる効
果がある。 Furthermore, if the system is already equipped with a test signal circuit, it can be carried out by simply changing the control system and adding an inexpensive detection circuit in the low frequency band, without adding any expensive microwave components. can be done at low cost and has the effect of improving reliability.
第１図は従来の空中線異常警報回路のブロツク
図、第２図はこの発明の一実施例による空中線異
常警報回路のブロツク図、第３図はこの発明の動
作説明のためのタイムチヤート図である。
１……空中線、４……送信機、３……送受切換
器、２……方向性結合器、１０……パイロツト信
号発生器、１３……パイロツト信号制御回路、１
２……リミツタ、８……受信機、１１ａ……異常
判定回路。なお図中同一符号は同一又は相当部分
を示す。
FIG. 1 is a block diagram of a conventional antenna abnormality warning circuit, FIG. 2 is a block diagram of an antenna abnormality warning circuit according to an embodiment of the present invention, and FIG. 3 is a time chart for explaining the operation of the present invention. . 1... Antenna, 4... Transmitter, 3... Transmission/reception switch, 2... Directional coupler, 10... Pilot signal generator, 13... Pilot signal control circuit, 1
2... Limiter, 8... Receiver, 11a... Abnormality determination circuit. Note that the same reference numerals in the figures indicate the same or equivalent parts.
Claims (1)
向性結合器を介して送信信号を供給する送信機
と、上記方向性結合器を介して上記空中線にパイ
ロツト信号を送出するパイロツト信号発生器と、
上記送信信号の送信直後に上記パイロツト信号を
発生せしめるパイロツト信号制御回路と、上記送
受切換器と受信系との間に接続され送信時該受信
系を保護するためのリミツタと、上記パイロツト
信号の発生直後から上記リミツタが飽和状態から
回復するまでの時間を測定し上記空中線の異常を
判定する異常判定回路とを備えたことを特徴とす
る空中線異常警報回路。1. An antenna, a transmitter that supplies a transmission signal to the antenna via a transmission/reception switch and a directional coupler, and a pilot signal generator that sends a pilot signal to the antenna via the directional coupler;
a pilot signal control circuit that generates the pilot signal immediately after transmitting the transmission signal; a limiter that is connected between the transmitter/receiver switch and the receiver system to protect the receiver system during transmission; and a limiter that generates the pilot signal. An antenna abnormality warning circuit comprising: an abnormality determination circuit that measures the time from immediately until the limiter recovers from the saturated state and determines whether the antenna is abnormal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57062144A JPS58178645A (en) | 1982-04-12 | 1982-04-12 | Circuit for alarming fault of antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57062144A JPS58178645A (en) | 1982-04-12 | 1982-04-12 | Circuit for alarming fault of antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58178645A JPS58178645A (en) | 1983-10-19 |
| JPH0376055B2 true JPH0376055B2 (en) | 1991-12-04 |
Family
ID=13191602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57062144A Granted JPS58178645A (en) | 1982-04-12 | 1982-04-12 | Circuit for alarming fault of antenna |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58178645A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE506487C2 (en) * | 1994-02-23 | 1997-12-22 | Allgon Ab | Systems with test transmitters and sensors for monitoring a receiver antenna |
| FI119304B (en) * | 2006-08-24 | 2008-09-30 | Idesco Oy | Identification of component mismatches in RFID readers |
-
1982
- 1982-04-12 JP JP57062144A patent/JPS58178645A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58178645A (en) | 1983-10-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5504570A (en) | Distance measuring equipment | |
| US4015206A (en) | Protective relaying modem receiver | |
| JPH0376055B2 (en) | ||
| JPS6222108B2 (en) | ||
| JP2748502B2 (en) | Radar equipment | |
| JPS62249087A (en) | Transponder device | |
| JPH071948B2 (en) | Remote control device for industrial equipment | |
| JP3280122B2 (en) | AE location detector | |
| JP2591363B2 (en) | Receiver fault diagnosis circuit | |
| JPS61107179A (en) | Ultrasonic obstruction detection apparatus for vehicle | |
| JP2618984B2 (en) | Pulse Doppler radar device | |
| JPS6334363Y2 (en) | ||
| JP2774826B2 (en) | Ultrasonic detection system | |
| KR20000046232A (en) | Device for frequency conversion loop for self-examination of communicators using difference frequencies | |
| JP2569840B2 (en) | Pulse receiver | |
| KR0155274B1 (en) | Misoperation detection apparatus for radar system | |
| JPH03145341A (en) | Cable loss detector | |
| JPH04334208A (en) | Protective device of transmitter | |
| JPS6254185A (en) | radar receiver | |
| JPS6033070A (en) | Radar equipment | |
| JPS5968688A (en) | Ultrasonic object detector | |
| JPH051166Y2 (en) | ||
| JPS61110076A (en) | radar receiver | |
| JPS5968685A (en) | Ultrasonic object detector | |
| JPH0543558B2 (en) |