JPS60146170A - Radar equipment - Google Patents
Radar equipmentInfo
- Publication number
- JPS60146170A JPS60146170A JP59003810A JP381084A JPS60146170A JP S60146170 A JPS60146170 A JP S60146170A JP 59003810 A JP59003810 A JP 59003810A JP 381084 A JP381084 A JP 381084A JP S60146170 A JPS60146170 A JP S60146170A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- amplifier
- output
- frequency
- afc
- 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
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/28—Details of pulse systems
- G01S7/285—Receivers
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
この発明は、レーダ装置の自動周波数制御（ＡＦＣ）回
路に関し、その目的とするところは誤差信号をＡ、ＦＣ
回路に注入することにより、ＡＦＩ’０回路を補正して
最大のビデオ出力を得ることにある〇−仔士＋１：４苓
）
従来この種の装置として、第１図１に示すものがあった
。図において、（１）は送受切替器、（２）は方向性結
合器、（３）はＡＦＯ用ミキサ、（４）はＡＦＣ回路、
（５）はローカル発振器、（６）は受信用ミキサ、（７
）は中間周波数増幅器、（８）はビデオ増幅器、（９）
は試験信号発生器、ａ〔は結合器である。ＡＲ″Ｃ回路
（４）と中間周波数増幅器（７）にはそれぞれフィルタ
が設けられ、その周波数特性が一致するよう製整されて
いる。Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to an automatic frequency control (AFC) circuit for a radar device, and its purpose is to convert error signals into A, FC
The purpose is to correct the AFI'0 circuit and obtain the maximum video output by injecting it into the circuit. A conventional device of this type was one shown in Figure 1. . In the figure, (1) is a transmission/reception switch, (2) is a directional coupler, (3) is an AFO mixer, (4) is an AFC circuit,
(5) is a local oscillator, (6) is a receiving mixer, (7
) is an intermediate frequency amplifier, (8) is a video amplifier, (9)
is a test signal generator, and a is a combiner. The AR″C circuit (4) and the intermediate frequency amplifier (7) are each provided with a filter, and are adjusted so that their frequency characteristics match.
次に動作について説明する。送信信号は、送受切替器（
１）を通り、方向性結合器（２）より空中線へ送られる
と同時に、方向性結合器（２）より分配されて、Ａ］ｉ
”０用ミキサ（３）に伝達される。ローカル発振器（５
）の信号は、ＡＦＯ用ミキミキ３）に送られ、送信信号
と混合さｈ−て中間周波数に変更されるがこの信号は、
ＡＦＣ回路（４）で一定の中間周波数になる様にローカ
ル発振器（５）を電圧制御している。その結果中間周波
数増幅器（７）のフィルタ特性の中心と入力の最大電力
となる周波数が一致しかつ一定となるよう制御される。Next, the operation will be explained. The transmission signal is transmitted through the transmission/reception switch (
A] i
” is transmitted to the mixer for 0 (3).The local oscillator (5
) is sent to the AFO MIKIMIKI 3), where it is mixed with the transmission signal and changed to an intermediate frequency.
The AFC circuit (4) controls the voltage of the local oscillator (5) to maintain a constant intermediate frequency. As a result, control is performed so that the center of the filter characteristics of the intermediate frequency amplifier (7) and the frequency at which the input maximum power coincides and remain constant.
一方空中線からの受信信号は送受切替器（１）を通り、
受信用ミキサ（６）−′ｒ′ローカル益垢呂「５）の信
号と混合されて中間周波数増幅器（７）、ビデオ増幅器
（８）を通しビデオ出力として取り出される。On the other hand, the received signal from the antenna passes through the transmitter/receiver switch (1),
It is mixed with the signal from the receiving mixer (6) and the local input mixer (5), and is taken out as a video output through an intermediate frequency amplifier (7) and a video amplifier (8).
送信信号がない場合は、試験信号発生器（９）からの出
力を結合器＋１０１ 、送受切替器（１）、方向性結合
器（２）を介して、それぞれのミキサ（３１、（Ｇｌに
加えて、ビデオ信号が出力されることでレーダ装置の機
能点検を行なっている０
ＡＩｉ”Ｃ回路（４）と中間周波数増幅器（７）のフィ
ルタを構成するコンデンサとインダクタンスは夫々異な
る温度特性を持っているので、当初の特性は一致してい
ても、温度が変化すると、両回路のフィルタ特性は異な
ってくる。If there is no transmission signal, the output from the test signal generator (9) is sent to each mixer (31, The capacitors and inductances that make up the filters of the AIi"C circuit (4) and the intermediate frequency amplifier (7) each have different temperature characteristics. Therefore, even if the initial characteristics are the same, the filter characteristics of both circuits will differ as the temperature changes.
従来のレーダ装置は以上のように構成されているので、
Ａ２０回路（４）と中間周波数増幅器（７）にそれぞれ
持っている、中間周波数のフィルタの温度特性の差によ
る周波数特性の差が生じやすく、ミキサ（６）の出力の
最大電力周波数が中間周波数増幅器（７）のフィルタ特
性の中心とずれ、定期的に、点検再調整する必要があっ
た０又試馳侶号孔生器（９）より試験信号を注入しても
、フィルタＮ性のわずかなずれは発見出来ないという欠
点があった。Conventional radar equipment is configured as described above, so
Differences in frequency characteristics tend to occur due to differences in temperature characteristics of the intermediate frequency filters that the A20 circuit (4) and the intermediate frequency amplifier (7) have, respectively, and the maximum power frequency of the output of the mixer (6) is higher than that of the intermediate frequency amplifier. (7) The filter characteristics were shifted from the center, and it was necessary to periodically check and readjust them. The disadvantage was that the discrepancy could not be detected.
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、ビデ増幅器の出力が最大となる様
に、誤差信号をＡ２０回路に注入することにより、Ａ２
０回路のフィルタ特性を補正するレーダ装置を提供する
ことを目的としている０〔発明の実施例〕
以下、との発明の一実施例を図について説明する。第２
図において（１）は送受切替器、（２）は方向性結合器
、（３）はＡＦＣ用ミキサ、（４）はＡＦＯ回路、（５
）はローカル発振器、（６）は受信用ミキサ、（７）は
中間周波数増幅器、（８）はビデオ増幅器、（９）は試
験信号発生器、００）は結合器、ａｌ）はＡＦＯ制御回
路、（２）は比較器である。This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by injecting an error signal into the A20 circuit so that the output of the bidet amplifier is maximized, the A2
Embodiment of the Invention Aiming at Providing a Radar Device that Corrects the Filter Characteristics of the Zero Circuit [Embodiment of the Invention] An embodiment of the invention will be described below with reference to the drawings. Second
In the figure, (1) is a transmission/reception switch, (2) is a directional coupler, (3) is an AFC mixer, (4) is an AFO circuit, and (5) is a directional coupler.
) is a local oscillator, (6) is a receiving mixer, (7) is an intermediate frequency amplifier, (8) is a video amplifier, (9) is a test signal generator, 00) is a coupler, al) is an AFO control circuit, (2) is a comparator.
次に動作について説明する０ＡＦＣ回路（４）と中間周
波数増幅器（７）のフィルタ特性に差が生ずると、ミキ
サ（６）の出力の最大電力周波数が中間周波数増幅器（
７）のフィルタの中心周波数からずれる０この周波数の
差をなくするためにはその分、局部発振器（５）の発振
周波数を変えれば良い。周波数の差がなくなったときビ
デオ増幅器（８）の出力が最大となる事から、逆にビデ
オ増幅器（８）の出力が最大となるように局部発振器（
５）の発振周波数を変えれば良い。本願ではＡＦ’Ｏ回
路（４）に誤差信号を力えることにより局部発振器（５
）の出力周波数を変えている０第２図の（１）から（１
０）の動作は従来と同様である０ＡＦＣ制御回路ａρの
出力電圧は、最初は零電圧としておき、試験信号発生器
（９７、ＡＦＯ回路（４）を動作させこの時のピデメ増
幅器（８）の出力電圧を比較器（イ）でサンプルホール
ドしておく、次の周期にはＡＦ’０制御回路０◇から任
意の誤差電圧をＡ ＩＩ” ０回路（４）に加えてその
時のビデオ増幅器（８）の出力電圧を前回と同様に比較
器０りでサンプルホールドする０この動作を数回くり返
し行なうことにより、ＡＦＯ回路（４）と中間周波数増
幅器（７）のフィルタ、特性の差が検出される０次にこ
の比較器０功内にツーンンルホールドされた、ビデオ信
号が最大値を示す時の誤差電圧を選択して、へＦＣ制御
回路αρより、ＡＦ（ｊ回路（４）に加えることにより
ローカル発振器（５）の周波数を最適値に設定すること
が出来る。If there is a difference in filter characteristics between the 0AFC circuit (4) and the intermediate frequency amplifier (7), the operation of which will be explained next, the maximum power frequency of the output of the mixer (6) will be lower than that of the intermediate frequency amplifier (7).
In order to eliminate this frequency difference, the oscillation frequency of the local oscillator (5) can be changed accordingly. Since the output of the video amplifier (8) reaches its maximum when the difference in frequency disappears, conversely, the local oscillator (
5) Just change the oscillation frequency. In this application, the local oscillator (5) is generated by inputting an error signal to the AF'O circuit (4).
) from (1) to (1) in Figure 2.
The operation of 0) is the same as the conventional one.The output voltage of the 0AFC control circuit aρ is set to zero voltage at first, and the test signal generator (97) operates the AFO circuit (4) to change the output voltage of the Pideme amplifier (8) at this time. The output voltage is sampled and held by the comparator (a), and in the next cycle, an arbitrary error voltage is added from the AF'0 control circuit 0◇ to the AII''0 circuit (4) and the video amplifier (8 ) is sampled and held using the comparator 0 as before.By repeating this operation several times, the difference in filter characteristics between the AFO circuit (4) and the intermediate frequency amplifier (7) can be detected. Next, select the error voltage when the video signal shows the maximum value, which is held in the comparator, and apply it to the AF (j circuit (4)) from the FC control circuit αρ. The frequency of the local oscillator (5) can be set to an optimal value.
第３図、第４図、第５図で説明すると、第３図はローカ
ル発振器（５）の制御電圧対周波数の特性図、第４図は
フィルタの特性図でｆｌが中心周波数を示している。第
５図は、不発明のタイミング図で、送信信号（ａ）と送
信信号（ａ）との間に１ｔｃｊ回路（４）に誤差信−＠
（Ｃ）を与えて、ローカル発振器周波数を制御している
。試験信号（ｂ）を受信回路に注入すると、ビデオ出力
（ｄ）が誤差信号（Ｃ）に応じて変化する。即ち試験信
号注入時、Ａ２０回路（４）を動作させると同時にＡＦ
Ｏ回路に誤差電圧を加えると、局部発振器（５）の周波
数が変化し、送信くり返し毎に、第４図のフィルタ特性
に対応して振幅の異なるビデオ出力（ｄ）の出力かえら
れる０このビデオ出力をサンプルホールドし、最大値を
示した時の誤差電圧△を記憶しておく（この時の誤差周
波数がΔｆとする）０次の送信信号でＡ２０回路（４）
がロックした周波数に対し前記Δｆの周波数分だけの誤
差電圧をローカル発振器（５）に加える０これによりＡ
ＦＯ回路（４）と中間周波数増幅器（７）の周波数の温
度特性の差を打ち消して、ビデオ信号増幅器（８）の出
力を最大にする事ができる。従ってＡ、ＦＣ回路（４）
と中間周波数増幅器（７）のフィルタの周波数特性を正
確に一致きせる必要がなく、調整が容易となる。又部品
の経年変化による性能低下もなくなる１、このようにし
て調整１−だ後に温度が変化すると、再度調整し直す必
要が生ずる。それに対しては、以上の動作を常時繰返し
て自動的に行うようにすれば良い。To explain using Figures 3, 4, and 5, Figure 3 is a characteristic diagram of the control voltage versus frequency of the local oscillator (5), and Figure 4 is a characteristic diagram of the filter, where fl indicates the center frequency. . FIG. 5 is an uninvented timing diagram in which an error signal is sent to the 1tcj circuit (4) between the transmission signal (a) and the transmission signal (a).
(C) to control the local oscillator frequency. When the test signal (b) is injected into the receiving circuit, the video output (d) changes according to the error signal (C). That is, when the test signal is injected, the A20 circuit (4) is operated and the AF
When an error voltage is applied to the O circuit, the frequency of the local oscillator (5) changes, and each time the transmission is repeated, the output of the video output (d), which has a different amplitude, corresponds to the filter characteristics shown in Figure 4. Sample and hold the output and memorize the error voltage △ when it shows the maximum value (the error frequency at this time is Δf) A20 circuit (4) with the 0th order transmission signal
An error voltage corresponding to the frequency Δf is applied to the local oscillator (5) with respect to the frequency locked by A.
By canceling out the difference in frequency temperature characteristics between the FO circuit (4) and the intermediate frequency amplifier (7), the output of the video signal amplifier (8) can be maximized. Therefore A, FC circuit (4)
It is not necessary to precisely match the frequency characteristics of the filters of the intermediate frequency amplifier (7) and the intermediate frequency amplifier (7), and adjustment becomes easy. In addition, performance degradation due to aging of parts is also eliminated. If the temperature changes after the first adjustment in this way, it will be necessary to readjust it again. To deal with this, the above-mentioned operations may be repeated all the time and automatically performed.
即ち、比較回路１〕オによってビデオ信号の最大値を発
見し、そり、に応じてＡＦＯ制御回路０υから誤差信号
をＡ、Ｆ Ｃ回路に自動的に力える３Ｊ：うにすれば良
い。That is, the maximum value of the video signal is found by the comparator circuit 1), and the error signal is automatically inputted from the AFO control circuit 0υ to the A and FC circuits according to the curvature.
なお上記実施例は、試験信号発生器（り）の出力を利用
（７たものを示［７たが、第５図（ｆ＞に示すように送
イわ信号のもれ信号を使用しても同様な効果があり、こ
の場合は試験信号発生器（９）は不要ノ：なる。Note that the above embodiment uses the output of the test signal generator (7), but as shown in FIG. has the same effect, and in this case, the test signal generator (9) is unnecessary.
ただしこの場合は、送信信号をその一？Ｊｔミキザ（３
）。However, in this case, what about the transmitted signal? Jt Mikiza (3
).
（６）に加えると強力ぎるので減衰器で低置させる事が
望オしい。If added to (6), it will be too powerful, so it is desirable to lower it with an attenuator.
以上のようにこの発明によれば受信出力が最大となるよ
うな誤差信号をＡＦＣ回路に与えるようにしたのでＡＦ
’Ｏ回路と、中間周波数回路のフィルタ周波数特性を、
正確に一致さぜる必要がなく、調整が容易となる利点が
ある。As described above, according to the present invention, since the error signal that maximizes the received output is given to the AFC circuit, the AF
'O circuit and intermediate frequency circuit filter frequency characteristics,
There is no need for exact matching, and there is an advantage that adjustment is easy.
第１図は従来のレーダ装置の構成図、第２図は本発明の
レーダ装置の一実施例の構成図、第３図はローカル発振
器の電圧対周波数の特性図、第４図はフィルタの特性を
示す図、第５図は本発明のレーダ装置の各部分の波形図
である。
図において、（１）は送受切替器、（２）は方向性結合
器、（３１、（６１はミギサ、（４）はＡＦＯ回路、（
５）は局部発振器、（７）は中間周波数増幅器、（８）
はビデオ増幅回路、αυはＡＦＣ制御回路、（ハ）は比
較器である。
なお、各図中の同一符号は同−又は相当部分を示す○
代理人 大岩増雄
第１図
１ｔｌＡイ訃３
第２図
第３図 第４図Fig. 1 is a block diagram of a conventional radar device, Fig. 2 is a block diagram of an embodiment of the radar device of the present invention, Fig. 3 is a voltage versus frequency characteristic diagram of a local oscillator, and Fig. 4 is a filter characteristic. FIG. 5 is a waveform diagram of each part of the radar device of the present invention. In the figure, (1) is a transmitter/receiver switch, (2) is a directional coupler, (31, (61 is a migisa), (4) is an AFO circuit, (
5) is a local oscillator, (7) is an intermediate frequency amplifier, (8)
is a video amplifier circuit, αυ is an AFC control circuit, and (c) is a comparator. In addition, the same reference numerals in each figure indicate the same or equivalent parts ○ Agent Masuo Oiwa Figure 1
Claims (1)
中間周波数とする第１および第２のミキサと、前記第１
のミキサの出力を受けて前記局部発振器の出力周波数を
一定に制御する自動周波数制御回路と、前記第２のミキ
サの出力を増幅する中間周波数増幅器と、この中間周波
数増幅器の出力を受けるビデオ増幅回路と、このビデオ
増幅回路の出力を最大とする誤差信号を前記自動周波数
制御回路に与える制御回路とを備えたレーダ装置。first and second mixers that mix the transmitted signal or the received signal with the output of the local oscillator to obtain an intermediate frequency;
an automatic frequency control circuit that receives the output of the second mixer and controls the output frequency of the local oscillator at a constant level; an intermediate frequency amplifier that amplifies the output of the second mixer; and a video amplifier circuit that receives the output of the intermediate frequency amplifier. and a control circuit that provides the automatic frequency control circuit with an error signal that maximizes the output of the video amplifier circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59003810A JPS60146170A (en) | 1984-01-10 | 1984-01-10 | Radar equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59003810A JPS60146170A (en) | 1984-01-10 | 1984-01-10 | Radar equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60146170A true JPS60146170A (en) | 1985-08-01 |
Family
ID=11567543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59003810A Pending JPS60146170A (en) | 1984-01-10 | 1984-01-10 | Radar equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60146170A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6378081A (en) * | 1986-09-20 | 1988-04-08 | Tokyo Keiki Co Ltd | Receiver for radar |
| FR2681696A1 (en) * | 1988-11-07 | 1993-03-26 | Marconi Gec Ltd | Radar system using an injection-locked transmitting stage |
| JPH0536384U (en) * | 1992-05-21 | 1993-05-18 | 株式会社トキメツク | Receiver for radar |
-
1984
- 1984-01-10 JP JP59003810A patent/JPS60146170A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6378081A (en) * | 1986-09-20 | 1988-04-08 | Tokyo Keiki Co Ltd | Receiver for radar |
| FR2681696A1 (en) * | 1988-11-07 | 1993-03-26 | Marconi Gec Ltd | Radar system using an injection-locked transmitting stage |
| JPH0536384U (en) * | 1992-05-21 | 1993-05-18 | 株式会社トキメツク | Receiver for radar |
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