JPS61162774A - Sweep type radar beacon - Google Patents

Sweep type radar beacon

Info

Publication number
JPS61162774A
JPS61162774A JP445885A JP445885A JPS61162774A JP S61162774 A JPS61162774 A JP S61162774A JP 445885 A JP445885 A JP 445885A JP 445885 A JP445885 A JP 445885A JP S61162774 A JPS61162774 A JP S61162774A
Authority
JP
Japan
Prior art keywords
frequency
radar
response code
racon
sweep type
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.)
Pending
Application number
JP445885A
Other languages
Japanese (ja)
Inventor
Katsuhiko Suzuki
勝彦 鈴木
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.)
Japan Radio Co Ltd
Original Assignee
Japan Radio Co Ltd
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 Japan Radio Co Ltd filed Critical Japan Radio Co Ltd
Priority to JP445885A priority Critical patent/JPS61162774A/en
Publication of JPS61162774A publication Critical patent/JPS61162774A/en
Pending legal-status Critical Current

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  • Radar Systems Or Details Thereof (AREA)

Abstract

PURPOSE:To suppress unneeded radio waves with a better frequency selection property, by generating a response signal only when the transmission frequency and the radar frequency come close to or equals each other. CONSTITUTION:The detection output from a detector 6 is amplified with a video amplifier 7 at the next stage, the output of which is compared with a set voltage V by a voltage comparator 8 and is outputted when a video pulse is larger than a set voltage and operates a response code generator 9 at the next to generate a specified code and after modulated with a amplification pulse modulator 2, it is emitted as response code from a receiving/transmitting antenna 3. In this case, it is so arranged that the response code is generated only when the radar frequency fR from a ship or the like comes close to or equals the transmission frequency fT from a radar beacon oscillator 1 thereby enabling the suppression of unneeded radio waves with a frequency selection property.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は灯台、危険海域等に敷設されるブイ □等に設
置され、船舶の安全航行を援助する掃引型レーコンに関
するものである。
[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a sweeping type racon that is installed at lighthouses, buoys, etc. installed in dangerous sea areas, etc., and assists the safe navigation of ships.

(従来の技術) 掃引型レーコンは対象とするレーダ周波数帯全域を掃引
し、レーダ電波を受信した時のみそのレーダパルスに同
期して送信し、レーダ側(船舶等)にて、そのレーコン
の位置及びレーコン局の識別を行い−そのレーコン局と
の位置関係を知る装置であも= (発明が解決しようとする問題点) 従来のこの種の掃引型レーコンは、受信する船舶等から
のレーダの周波数を識別することなく、その電界強度及
びタイミングを検知して特定の符号にて応答する方法で
あった。このため。
(Prior art) A sweep type racon sweeps the entire target radar frequency band, and only when it receives a radar radio wave, transmits it in synchronization with the radar pulse, and the radar side (ship, etc.) can determine the racon's position. (Problem to be solved by the invention) Conventional sweep type racons of this type detect radar signals from receiving ships, etc. This method detected the electric field strength and timing and responded with a specific code without identifying the frequency. For this reason.

レーダの受信する周波数以外゛の不要の周波数について
も送信しており、消費電力も増加する。
Unnecessary frequencies other than those received by the radar are also transmitted, which increases power consumption.

これを解決するため1周波数識別機能をもたせるには、
複雑な回路を必要とし経済的ではなかったO (問題点を解決するための手段) 本発明は以上の間題を解決するため、空中線の反射電力
を利用゛シ゛、パルス変調0N10FF比を30 dB
程度に設定し2周波数選択特性を付与して、高感度かつ
不要な電波発射をすることなく。
To solve this problem, to provide one frequency identification function,
(Means for solving the problem) In order to solve the above problem, the present invention utilizes the reflected power of the antenna and increases the pulse modulation 0N10FF ratio to 30 dB.
It is set at a certain level and has two frequency selection characteristics, providing high sensitivity and without emitting unnecessary radio waves.

比較的、簡単な回路構成により、実現するものである。This is realized by a relatively simple circuit configuration.

以下図面により本発明を説明する。The present invention will be explained below with reference to the drawings.

(実施例) 第1図は本発明の一実施例の回路構成を示すブロック図
で、1は発振器、2は増巾パルス変調器、3は送、受信
兼用空中線、4はサーキュレータ、5はリミッタ、6は
検波器、7はビデオ増巾器、8は電圧比較器、9は応答
符号発生器、 10は掃引発生器である。前記、増巾パ
ルス変調器2.サーキュレータ4・・・・・・応答符号
発生器9は1つのループを構成し、また前記掃引発生器
10はレーコン発振器の掃引を行う構成をとる・ (動 作) レーコン発振器1からのレーコン送信周波数は、第2図
に示すように掃引発生器10の電圧により周波数が時間
の経過とともに変化し、船舶等からのレーダ周波数帯の
全域をカバーする。
(Embodiment) Fig. 1 is a block diagram showing the circuit configuration of an embodiment of the present invention, in which 1 is an oscillator, 2 is an amplified pulse modulator, 3 is an antenna for both transmitting and receiving purposes, 4 is a circulator, and 5 is a limiter. , 6 is a detector, 7 is a video amplifier, 8 is a voltage comparator, 9 is a response code generator, and 10 is a sweep generator. The amplified pulse modulator 2. Circulator 4...The response code generator 9 constitutes one loop, and the sweep generator 10 is configured to sweep the racon oscillator (Operation) The racon transmission frequency from the racon oscillator 1 As shown in FIG. 2, the frequency changes over time depending on the voltage of the sweep generator 10, and covers the entire radar frequency band from ships and the like.

該レーコン発振器1からのレーコン送信周波数は増巾パ
ルス変調器2により所定の符号にパルス変調される。こ
のパルス変調された符号はサーキュレータ4を介して送
、受信兼用空中線3から発射される。
The racon transmission frequency from the racon oscillator 1 is pulse-modulated into a predetermined code by an amplifying pulse modulator 2. This pulse-modulated code is transmitted via a circulator 4 and emitted from an antenna 3 that also serves as a receiver.

一方、リミッタ5は該空中線から受信された近距離のレ
ーダからの過大入力パルスが検波器6に入るのを保護し
、検波器6はレーダ受信信、号を検波出力するものであ
り、このときの検波器6への入力レベル例を第3図に示
す。該検波出力は次段のビデオ増幅器7で増巾を行い、
この増巾出力を電圧比較器8で設定電圧Vと比較し、ビ
デオパルスが該設定電圧より大なる時に出力され9次段
の応答符号発生器9を動作させ。
On the other hand, the limiter 5 protects the excessive input pulse from a nearby radar received from the antenna from entering the detector 6, and the detector 6 detects and outputs the radar received signal. An example of the input level to the detector 6 is shown in FIG. The detected output is amplified by the next stage video amplifier 7,
This amplified output is compared with a set voltage V by a voltage comparator 8, and when the video pulse is greater than the set voltage, it is output and the response code generator 9 of the ninth stage is operated.

所定の符号を発生し増巾パルス変調器2で変調され、送
、受信兼用空中線3から応答符号が発射される。
A predetermined code is generated and modulated by the amplifying pulse modulator 2, and a response code is emitted from the antenna 3 for both transmitting and receiving purposes.

本発明は上述した動作過程において、増巾パルス変調器
2のパルス変調0N10FF比を例えば30 dB程度
にすることにより、空中線3での反射成分は一20dB
として、送信時の一50dB程度の無変調信号がOFF
時即ち受信時に得られ。
In the above-mentioned operation process, the present invention sets the pulse modulation 0N10FF ratio of the amplifying pulse modulator 2 to about 30 dB, so that the reflected component at the antenna 3 is reduced to -20 dB.
As a result, the unmodulated signal of about 150 dB during transmission is turned off.
obtained at the time of reception.

この信号を送受兼用空中線の反射を利用してリミッタ5
.検波器6に加えるようにする。いま送信周波数をft
、船舶等からのレーダ波の周波数をfIIとすると、ビ
デオ増巾器7の周波数特性によりftとfRが近接もし
くは等しくなったとき。
This signal is transmitted to the limiter 5 using the reflection of the antenna for both transmission and reception.
.. It is added to the detector 6. Now change the transmission frequency to ft
, when fII is the frequency of radar waves from a ship or the like, and ft and fR are close to or equal to each other due to the frequency characteristics of the video amplifier 7.

hとfIIのビート信号が得られる1゜第4図はこの場
合の実験データの一例を示し、 ft成分が有るときと
、無いときと比較すると、 ft成分が有ることにより
、約25 dB程度受信感度が上昇していることが、受
信感度B(従来型)と受信感度A(本発明)との特性曲
線の比較から明らかである。
Fig. 4 shows an example of experimental data in this case.Comparing with and without the ft component, the presence of the ft component reduces the reception by about 25 dB. It is clear from a comparison of the characteristic curves of reception sensitivity B (conventional type) and reception sensitivity A (invention) that the sensitivity has increased.

本発明は前述した受信感度の特性を利用して。The present invention utilizes the characteristics of reception sensitivity described above.

ftとfRが近接もしくは等しくなったときのみ応答さ
せるように電圧比較器8の設定電圧Vを定めることがで
き、目的とする周波数選択特性を保有する掃引型レーコ
ンを得ることができる。
The set voltage V of the voltage comparator 8 can be determined so that the voltage comparator 8 responds only when ft and fR are close to or equal to each other, and a sweep type racon having the desired frequency selection characteristics can be obtained.

(発明の効果) 以上説明したように9本発明はレーコン発振   −器
1からの送信周波数1丁に対し、船舶等からのレーダ周
波数fRが近接もしくは等しくなった時のみ、応答符号
を発生させるように設定しであるので2周波数選択特性
を有し、不要な電波を抑圧するとともに消費電力の低減
化をはかり。
(Effects of the Invention) As explained above, the present invention generates a response code only when the radar frequency fR from a ship, etc. approaches or becomes equal to one transmission frequency from the racon oscillator 1. Since it is set to 2, it has two frequency selection characteristics, suppressing unnecessary radio waves and reducing power consumption.

受信感度を上げることができる。しかも9回路構成が比
較的に簡単な手段で実現できるので経済的である。
Reception sensitivity can be increased. Moreover, it is economical because the nine-circuit configuration can be realized by relatively simple means.

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

第1図は本発明の一実施例の回路構成を示すブロック図
、第2図は送信周波数の掃引側図。 第3図は検波器6の入力レベル図、第4図は本発明と従
来型との受信感度を示す。 1・・・発振器、2・・・増巾パルス変調器、3・・・
送。 受信兼用空中線、4・・・サーキュレータ、5・・・リ
ミッタ、6・・・検波器、7・・・ビデオ増巾器、8・
・・電圧比較器、9・・・応答符号発生器、10・・・
掃引発生器。
FIG. 1 is a block diagram showing the circuit configuration of an embodiment of the present invention, and FIG. 2 is a sweep side diagram of the transmission frequency. FIG. 3 shows an input level diagram of the detector 6, and FIG. 4 shows the receiving sensitivity of the present invention and the conventional type. 1... Oscillator, 2... Amplified pulse modulator, 3...
Send. Receiving antenna, 4... Circulator, 5... Limiter, 6... Detector, 7... Video amplifier, 8...
...Voltage comparator, 9...Response code generator, 10...
Sweep generator.

Claims (1)

【特許請求の範囲】[Claims] 増巾パルス変調器のパルス変調ON/OFF比を30d
B程度とし、空中線における反射を利用して掃引型レー
コンの送信周波数f_Tに対し、船舶等からのレーダー
周波数f_Rが近接もしくは等しくなった時のみ、応答
符号発生器からの応答符号を発生するよう電圧比較器の
設定電圧を定め不要な電波発射を抑圧し、周波数選択特
性を保有するように構成したことを特徴とする掃引型レ
ーコン。
The pulse modulation ON/OFF ratio of the amplified pulse modulator is 30d.
B, and the voltage is set so that the response code from the response code generator is generated only when the radar frequency f_R from a ship, etc. is close to or equal to the transmission frequency f_T of the sweep type racon using reflection in the antenna. A sweep type racon characterized in that it is configured to suppress unnecessary radio wave emission by determining the set voltage of the comparator and to have frequency selection characteristics.
JP445885A 1985-01-14 1985-01-14 Sweep type radar beacon Pending JPS61162774A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP445885A JPS61162774A (en) 1985-01-14 1985-01-14 Sweep type radar beacon

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP445885A JPS61162774A (en) 1985-01-14 1985-01-14 Sweep type radar beacon

Publications (1)

Publication Number Publication Date
JPS61162774A true JPS61162774A (en) 1986-07-23

Family

ID=11584702

Family Applications (1)

Application Number Title Priority Date Filing Date
JP445885A Pending JPS61162774A (en) 1985-01-14 1985-01-14 Sweep type radar beacon

Country Status (1)

Country Link
JP (1) JPS61162774A (en)

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