JP2576759B2 - Radio wave detector - Google Patents
Radio wave detectorInfo
- Publication number
- JP2576759B2 JP2576759B2 JP9400393A JP9400393A JP2576759B2 JP 2576759 B2 JP2576759 B2 JP 2576759B2 JP 9400393 A JP9400393 A JP 9400393A JP 9400393 A JP9400393 A JP 9400393A JP 2576759 B2 JP2576759 B2 JP 2576759B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- amplifier
- amplified
- radio wave
- variable attenuator
- 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
Landscapes
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Radar Systems Or Details Thereof (AREA)
- Control Of Amplification And Gain Control (AREA)
- Amplifiers (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電波探知装置に関し、
特に、電波探知装置における受信機ヘッドの広帯域増幅
器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio wave detecting device,
In particular, it relates to a broadband amplifier for a receiver head in a radio wave detection device.
【０００２】[0002]
【従来の技術】一般に、電波探知装置においては、任意
の距離・方位から到来する電波を瞬時に探知し、分析・
識別を行なう性格上、受信機ヘッドの広帯域増幅器の性
能を最大限に利用する必要がある。このため、電波探知
装置では一般に広帯域増幅器には利得制御機能が付加さ
れていない。2. Description of the Related Art Generally, a radio wave detecting device instantaneously detects a radio wave arriving from an arbitrary distance and azimuth and analyzes and detects the radio wave.
Due to the nature of the discrimination, it is necessary to make the most of the performance of the wideband amplifier of the receiver head. For this reason, in a radio wave detection device, generally, a gain control function is not added to a broadband amplifier.
【０００３】一方、通常の受信機においては、可変減衰
器を備えて、受信レベルに応じて可変減衰器の減衰量を
制御しており、このような受信機として、例えば、特開
昭５５−１５０６２４号公報に記載の受信機が知られて
いる。On the other hand, an ordinary receiver is provided with a variable attenuator and controls the amount of attenuation of the variable attenuator according to the reception level. The receiver described in 150624 is known.
【０００４】[0004]
【発明が解決しようとする課題】上述のように、従来の
広帯域増幅器では、利得制御機能が付加されていない関
係上、ある周波数で強い電波が到来すると、その周波数
で広帯域増幅器が飽和し、本来受信可能な他の周波数の
電波を受信し、増幅できなくなるという問題点がある。As described above, in the conventional wide-band amplifier, since a strong radio wave arrives at a certain frequency because the gain control function is not added, the wide-band amplifier is saturated at that frequency, and the conventional wide-band amplifier is saturated. There is a problem that radio waves of other receivable frequencies are received and cannot be amplified.
【０００５】本発明の目的は、所定の周波数で電波が到
来した際においても、他の周波数の電波を受信すること
のできる電波探知装置を提供することにある。[0005] It is an object of the present invention to provide a radio wave detecting device capable of receiving radio waves of other frequencies even when radio waves arrive at a predetermined frequency.
【０００６】[0006]
【課題を解決するための手段】本発明によれば、広帯域
ＲＦ信号を受信信号を受け該受信信号を増幅して増幅信
号を出力する広帯域増幅器と、前記増幅信号を受ける受
信機とを有する電波探知装置において、前記広帯域増幅
器には、前記受信信号を増幅して第１の増幅信号を出力
する第１の増幅器と、前記受信信号を減衰して減衰信号
を出力する可変減衰器と、前記減衰信号を増幅して第２
の増幅信号を出力する第２の増幅器と、前記第１の増幅
器及び前記可変減衰器に選択的に前記受信信号を与える
第１の切替手段と、前記第１及び前記第２の増幅信号を
前記増幅信号として選択的に前記受信機に与える第２の
切替手段と、前記第１の増幅信号のレベルを検出して検
出信号を出力する検出手段と、該検出信号が予め設定さ
れた基準値を越えると比較結果信号を出力する比較手段
と、前記比較結果信号を受けた際前記第１の切替手段を
制御して前記受信信号を前記可変減衰器に与え前記第２
の切替手段を制御して前記第２の増幅信号を前記増幅信
号として前記受信機に与えるとともに前記可変減衰器の
減衰量を制御する制御手段が備えられていることを特徴
とする電波探知装置が得られる。According to the present invention, there is provided a radio wave comprising: a broadband amplifier that receives a broadband RF signal and amplifies the received signal to output an amplified signal; and a receiver that receives the amplified signal. In the detection device, the broadband amplifier includes a first amplifier that amplifies the received signal and outputs a first amplified signal; a variable attenuator that attenuates the received signal and outputs an attenuated signal; Amplify the signal to the second
A second amplifier for outputting the amplified signal of the first amplifier, first switching means for selectively supplying the received signal to the first amplifier and the variable attenuator, and the first and the second amplified signals Second switching means for selectively providing the amplified signal to the receiver; detecting means for detecting the level of the first amplified signal to output a detection signal; and detecting the detection signal with a predetermined reference value. A comparison means for outputting a comparison result signal when the signal exceeds the threshold value, and a control means for controlling the first switching means when receiving the comparison result signal to supply the received signal to the variable attenuator,
Control means for controlling the switching means and providing the second amplified signal to the receiver as the amplified signal and controlling the attenuation of the variable attenuator. can get.
【０００７】[0007]
【実施例】以下本発明について実施例によって説明す
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments.
【０００８】図１を参照して、空中線（図示せず）で受
信された受信信号１は、ＲＦスイッチ２を経由して、増
幅器３で増幅信号（第１の増幅信号）に増幅される（増
幅器３は広帯域のＲＦ信号を増幅する）。この増幅信号
は方向性結合器４を経由して、ＲＦスイッチ５に与えら
れる。そして、この増幅信号はＲＦスイッチ５から受信
機（図示せず）に与えられ、ここで処理される。Referring to FIG. 1, a received signal 1 received by an antenna (not shown) is amplified by an amplifier 3 into an amplified signal (first amplified signal) via an RF switch 2 (see FIG. 1). The amplifier 3 amplifies the broadband RF signal). This amplified signal is supplied to the RF switch 5 via the directional coupler 4. Then, the amplified signal is supplied from the RF switch 5 to a receiver (not shown), where it is processed.
【０００９】一方、第１の増幅信号は方向性結合器で分
岐されて分岐信号１５として検出回路１２に与えられ
る。検出回路１２では分岐信号を増幅検波して検波信号
として比較回路１３に与える。比較回路１３では予め設
定された基準値と検波信号とを比較して、基準値を越え
た際比較結果信号１４をＲＦ制御回路１１に出力する。
ＲＦ制御回路１１では比較結果信号１４に基づいてＲＦ
スイッチ２及び５を駆動する駆動信号９と可変減衰器７
を制御する制御信号１０を送出する。On the other hand, the first amplified signal is branched by the directional coupler and supplied to the detection circuit 12 as a branched signal 15. The detection circuit 12 amplifies and detects the branch signal and supplies it to the comparison circuit 13 as a detection signal. The comparison circuit 13 compares a predetermined reference value with the detection signal, and outputs a comparison result signal 14 to the RF control circuit 11 when the detection value exceeds the reference value.
In the RF control circuit 11, based on the comparison result signal 14,
Drive signal 9 for driving switches 2 and 5 and variable attenuator 7
Is transmitted.
【００１０】ＲＦスイッチ２には可変減衰器７を介して
増幅器８が接続され増幅器８にはＲＦスイッチ５が接続
されている。この実施例では増幅器３及び方向性結合器
４を備える経路をＡで示し、可変減衰器７及び増幅器８
を備える経路をＢで示す。An amplifier 8 is connected to the RF switch 2 via a variable attenuator 7, and an RF switch 5 is connected to the amplifier 8. In this embodiment, a path including the amplifier 3 and the directional coupler 4 is indicated by A, and the variable attenuator 7 and the amplifier 8
Are indicated by B.
【００１１】上述のように検波信号レベルが基準値を越
えた際には、ＲＦ制御回路１１によって駆動信号９及び
制御信号１０が送出される。ＲＦスイッチ２及び５では
駆動信号によって経路をＡからＢに切り替える。また、
減衰器７は制御信号によってその減衰量が制御されるこ
とになる（つまり、入力信号（受信信号）の振幅を制御
する）。その結果、減衰器７で減衰された後増幅器８で
増幅された受信信号（つまり、第２の増幅信号）が受信
機に与えられることになる（増幅器８は広帯域のＲＦ信
号を増幅する）。As described above, when the detection signal level exceeds the reference value, the driving signal 9 and the control signal 10 are transmitted by the RF control circuit 11. In the RF switches 2 and 5, the path is switched from A to B by the drive signal. Also,
The amount of attenuation of the attenuator 7 is controlled by the control signal (that is, the amplitude of the input signal (received signal) is controlled). As a result, the received signal (that is, the second amplified signal) that has been attenuated by the attenuator 7 and then amplified by the amplifier 8 is provided to the receiver (the amplifier 8 amplifies the broadband RF signal).
【００１２】このように、受信信号が所定のレベルを越
えると、経路Ａから経路Ｂに切り替わり、可変減衰器７
で信号を減衰された後、増幅器８で増幅されＲＦスイッ
チ５を経由し受信機へ信号６が送出され処理されること
になる。従って、所定の周波数において強い電波が到来
した場合には、経路Ａで動作していた回路が瞬時に経路
Ｂに切り替わることになって、増幅器の飽和状態を防止
することができる。As described above, when the received signal exceeds a predetermined level, the path is switched from the path A to the path B, and the variable attenuator 7 is switched.
After the signal is attenuated, the signal is amplified by the amplifier 8 and transmitted to the receiver via the RF switch 5 for processing. Therefore, when a strong radio wave arrives at a predetermined frequency, the circuit operating on the path A is instantaneously switched to the path B, and the saturation state of the amplifier can be prevented.
【００１３】[0013]
【発明の効果】以上説明したように、本発明では、所定
周波数において強いレベルの信号が受信された場合、受
信感度を落して、受信増幅器が飽和することを避けるよ
うにしたから、同タイミングで受信した他の周波数の電
波も受信することができるという効果がある。As described above, according to the present invention, when a signal of a high level is received at a predetermined frequency, the receiving sensitivity is reduced to prevent the receiving amplifier from being saturated. There is an effect that radio waves of other received frequencies can also be received.
【図１】本発明による電波探知装置に用いられる広帯域
増幅器の一実施例を示すブロック図である。FIG. 1 is a block diagram showing an embodiment of a broadband amplifier used in a radio wave detection device according to the present invention.
１ 受信信号 ２，５ ＲＦスイッチ ３，８ 増幅器 ４ 方向性結合器 ６ 増幅信号 ７ 可変減衰器 ９ 駆動信号 １０ 制御信号 １１ ＲＦ制御回路 １２ 検出回路 １３ 比較回路 DESCRIPTION OF SYMBOLS 1 Received signal 2, 5 RF switch 3, 8 Amplifier 4 Directional coupler 6 Amplified signal 7 Variable attenuator 9 Drive signal 10 Control signal 11 RF control circuit 12 Detection circuit 13 Comparison circuit
Claims (1)
信号を増幅して増幅信号を出力する広帯域増幅器と、前
記増幅信号を受ける受信機とを有する電波探知装置にお
いて、前記広帯域増幅器には、前記受信信号を増幅して
第１の増幅信号を出力する第１の増幅器と、前記受信信
号を減衰して減衰信号を出力する可変減衰器と、前記減
衰信号を増幅して第２の増幅信号を出力する第２の増幅
器と、前記第１の増幅器及び前記可変減衰器に選択的に
前記受信信号を与える第１の切替手段と、前記第１及び
前記第２の増幅信号を前記増幅信号として選択的に前記
受信機に与える第２の切替手段と、前記第１の増幅信号
のレベルを検出して検出信号を出力する検出手段と、該
検出信号が予め設定された基準値を越えると比較結果信
号を出力する比較手段と、前記比較結果信号を受けた際
前記第１の切替手段を制御して前記受信信号を前記可変
減衰器に与え前記第２の切替手段を制御して前記第２の
増幅信号を前記増幅信号として前記受信機に与えるとと
もに前記可変減衰器の減衰量を制御する制御手段が備え
られていることを特徴とする電波探知装置。1. A radio wave detecting apparatus comprising: a broadband amplifier that receives a wideband RF signal and amplifies the received signal to output an amplified signal; and a receiver that receives the amplified signal. A first amplifier for amplifying the received signal to output a first amplified signal; a variable attenuator for attenuating the received signal to output an attenuated signal; and a second amplified signal for amplifying the attenuated signal. A second amplifier for outputting the received signal to the first amplifier and the variable attenuator, and the first and second amplified signals as the amplified signal. Second switching means for selectively giving the signal to the receiver, detecting means for detecting the level of the first amplified signal and outputting a detection signal, and comparing when the detection signal exceeds a preset reference value. A comparator that outputs the result signal And a stage, when receiving the comparison result signal, controlling the first switching means to provide the received signal to the variable attenuator and controlling the second switching means to amplify the second amplified signal. A radio wave detecting apparatus, comprising: a control unit that supplies a signal to the receiver and controls an amount of attenuation of the variable attenuator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9400393A JP2576759B2 (en) | 1993-04-21 | 1993-04-21 | Radio wave detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9400393A JP2576759B2 (en) | 1993-04-21 | 1993-04-21 | Radio wave detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06310960A JPH06310960A (en) | 1994-11-04 |
| JP2576759B2 true JP2576759B2 (en) | 1997-01-29 |
Family
ID=14098252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9400393A Expired - Lifetime JP2576759B2 (en) | 1993-04-21 | 1993-04-21 | Radio wave detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2576759B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9041535B2 (en) | 2012-12-26 | 2015-05-26 | 3M Innovative Properties Company | Signal blocking detection in offender monitoring systems |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2513367A (en) * | 2013-04-25 | 2014-10-29 | Bae Systems Plc | Improvements in and relating to sensitivity time control for radars |
| EP3059870A4 (en) * | 2013-10-18 | 2016-11-02 | Fujitsu Ltd | Semiconductor integrated circuit and wireless transmitter |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5626417U (en) * | 1979-08-01 | 1981-03-11 | ||
| JPS61292581A (en) * | 1985-06-20 | 1986-12-23 | Furuno Electric Co Ltd | Agc apparatus for underwater detector |
| JPH0235587A (en) * | 1988-07-26 | 1990-02-06 | Nippon Signal Co Ltd:The | Method for automatically examining ticket |
| JPH02125509A (en) * | 1988-11-04 | 1990-05-14 | Nec Corp | Attenuator |
-
1993
- 1993-04-21 JP JP9400393A patent/JP2576759B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9041535B2 (en) | 2012-12-26 | 2015-05-26 | 3M Innovative Properties Company | Signal blocking detection in offender monitoring systems |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06310960A (en) | 1994-11-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19960917 |