JP2964752B2 - Radio wave detector - Google Patents
Radio wave detectorInfo
- Publication number
- JP2964752B2 JP2964752B2 JP34237191A JP34237191A JP2964752B2 JP 2964752 B2 JP2964752 B2 JP 2964752B2 JP 34237191 A JP34237191 A JP 34237191A JP 34237191 A JP34237191 A JP 34237191A JP 2964752 B2 JP2964752 B2 JP 2964752B2
- Authority
- JP
- Japan
- Prior art keywords
- radio wave
- circuit
- level
- reception
- reception level
- 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
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
に指向性空中線を用いて遠距離の電波源を探知する電波
探知装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio wave detecting device, and more particularly to a radio wave detecting device for detecting a radio wave source at a long distance by using a directional antenna.
【０００２】[0002]
【従来の技術】従来の電波探知装置は、図２に示すよう
に、指向性空中線１で電波を受信して方位の探知を行っ
ている。このとき、受信電波が強い場合は、指向性空中
線１の主ビーム以外の方向の電波も受信されるため、方
位の探知が困難になる。このため、従来では無指向性空
中線２を併用し、両空中線の受信レベルを振幅比較回路
３で比較し、指向性空中線１の方が無指向性空中線２よ
り一定値以上受信レベルが高い場合に指向性空中線１の
主ビームで受信したと判定し、電波の到来方向の探知を
行っている。2. Description of the Related Art As shown in FIG. 2, a conventional radio wave detecting device detects a direction by receiving a radio wave through a directional antenna 1. At this time, if the received radio wave is strong, radio waves in directions other than the main beam of the directional antenna 1 are also received, so that it is difficult to detect the azimuth. For this reason, conventionally, the omnidirectional antenna 2 is used in combination, and the reception levels of both antennas are compared by the amplitude comparison circuit 3. If the reception level of the directional antenna 1 is higher than the omnidirectional antenna 2 by a certain value or more, The main beam of the directional antenna 1 is determined to have been received, and the direction of arrival of the radio wave is detected.
【０００３】[0003]
【発明が解決しようとする課題】この従来の電波探知装
置では、指向性空中線１と無指向性空中線２の受信レベ
ルを比較することで、指向性空中線１の主ビームで受信
した電波を判定しているが、無指向性空中線２の利得が
指向性空中線１に対して低いため、電波が弱くなると指
向性空中線では受信可能であるが、無指向性空中線では
受信できなくなり、受信レベル比較による主ビームでの
受信の判定ができなくなるという問題がある。本発明の
目的は、弱い電波でも主ビームでの受信の判定を可能に
した電波探知装置を提供することにある。In this conventional radio wave detecting device, the radio wave received by the main beam of the directional antenna 1 is determined by comparing the reception levels of the directional antenna 1 and the omni-directional antenna 2. However, since the gain of the omnidirectional antenna 2 is lower than that of the directional antenna 1, when the radio wave becomes weaker, the signal can be received by the directional antenna, but cannot be received by the omnidirectional antenna. There is a problem that it is not possible to determine the reception by the beam. SUMMARY OF THE INVENTION An object of the present invention is to provide a radio wave detection device that can determine reception of a main beam even with a weak radio wave.
【０００４】[0004]
【課題を解決するための手段】本発明の電波探知装置
は、指向性空中線、無指向性空中線、及び振幅比較回路
で構成される電波探知装置に、無指向性空中線の受信レ
ベルと、その受信雑音レベルに基づいて設定したレベル
値とを比較し、受信レベルが設定レベル以下であるとき
に信号を出力する受信レベル検出回路と、振幅比較回路
と受信レベル検出回路の各出力の論理和をとる合成回路
とを有し、この合成回路の出力により主ビームで受信し
た電波と判定するように構成する。SUMMARY OF THE INVENTION A radio wave detecting device according to the present invention comprises a radio wave detecting device comprising a directional antenna, an omnidirectional antenna, and an amplitude comparing circuit, which is provided with a reception level of an omnidirectional antenna and a reception level thereof. A logical value is compared with a level value set based on the noise level, and a logical sum of each output of the receiving level detecting circuit, the amplitude comparing circuit, and the receiving level detecting circuit that outputs a signal when the receiving level is equal to or lower than the set level is obtained. A combining circuit, and the output of the combining circuit is configured to determine the radio wave received by the main beam.
【０００５】[0005]
【作用】電波が強い場合には振幅比較回路での判定を行
い、電波が弱い場合には受信レベル検出回路において無
指向性空中線の受信レベルが所定以下を検出したとき
に、指向性空中線での受信を主ビームでの受信として判
定する。When the radio wave is strong, the amplitude comparison circuit makes a judgment. When the radio wave is weak, when the reception level of the omnidirectional antenna is detected to be lower than a predetermined level by the reception level detection circuit, the detection by the directional antenna is performed. Reception is determined as reception by the main beam.
【０００６】[0006]
【実施例】次に、本発明について図面を参照して説明す
る。図１は本発明の一実施例の電波探知装置のブロック
図である。この電波探知装置は、指向性空中線１の受信
レベルと、無指向性空中線２の受信レベルとを振幅比較
回路３で比較し、指向性空中線１の方が無指向性空中線
２より一定値以上受信レベルが高い場合に、指向性空中
線１の主ビームで受信したことを判定する信号を合成回
路５を通して出力するように構成される。Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a radio wave detection device according to one embodiment of the present invention. In this radio wave detection device, the reception level of the directional antenna 1 is compared with the reception level of the omnidirectional antenna 2 by the amplitude comparison circuit 3, and the directional antenna 1 receives a certain value or more from the omnidirectional antenna 2. When the level is high, a signal for judging that the signal is received by the main beam of the directional antenna 1 is output through the synthesizing circuit 5.
【０００７】更に、この構成に加えて、無指向性空中線
２の受信レベルと受信機雑音レベルを基に設定した値と
を比較し、この受信レベルが一定値以下であることを検
出する受信レベル検出回路４を設け、この検出結果を前
記振幅比較回路３の結果と合成回路５において論理和を
とって出力するように構成している。Further, in addition to this configuration, the reception level of the omnidirectional antenna 2 is compared with a value set based on the receiver noise level, and a reception level for detecting that this reception level is equal to or less than a predetermined value is detected. A detection circuit 4 is provided, and the result of the detection is ORed with the result of the amplitude comparison circuit 3 in the synthesis circuit 5 and output.
【０００８】この構成によれば、電波の受信レベルが強
い場合には、従来と同様に振幅各回路３における比較結
果により、指向性空中線１の主ビームで受信したことを
判定することができる。一方、電波の受信レベルが弱
く、指向性空中線１と無指向性空中線２の受信レベルを
振幅比較回路３では比較することができない場合には、
受信レベル検出回路４からの検出結果に基づいて判定す
る。即ち、無指向性空中線２での受信レベルが所定値以
下の場合には、指向性空中線１で受信される電波の受信
レベルも弱いことから、このときに指向性空中線１で電
波が受信された場合は、指向性空中線１の主ビームで受
信した信号と判定する。According to this configuration, when the reception level of the radio wave is high, it is possible to determine from the comparison result in each amplitude circuit 3 that the radio wave is received by the main beam of the directional antenna 1 as in the related art. On the other hand, when the reception level of the radio wave is weak and the reception levels of the directional antenna 1 and the omnidirectional antenna 2 cannot be compared by the amplitude comparison circuit 3,
The determination is made based on the detection result from the reception level detection circuit 4. That is, when the reception level at the omnidirectional antenna 2 is equal to or lower than the predetermined value, the reception level of the radio wave received at the directional antenna 1 is also weak. In this case, it is determined that the signal is received by the main beam of the directional antenna 1.
【０００９】[0009]
【発明の効果】以上説明したように本発明は、電波が強
い場合にはこれまでと同様に振幅比較回路での判定を行
い、電波が弱い場合には受信レベル検出回路において無
指向性空中線の受信レベルが所定以下を検出したとき
に、指向性空中線での受信を主ビームでの受信として判
定することにより、無指向性空中線で受信できないよう
な微弱な信号についても方位探知できるという効果を有
する。As described above, according to the present invention, when the radio wave is strong, the determination by the amplitude comparison circuit is performed as before, and when the radio wave is weak, the omnidirectional antenna is detected by the reception level detection circuit. When the reception level is detected to be equal to or less than a predetermined value, the reception in the directional antenna is determined as the reception in the main beam, so that the azimuth can be detected even for a weak signal that cannot be received in the omnidirectional antenna. .
【図１】本発明の電波探知装置の一実施例のブロック図
である。FIG. 1 is a block diagram of an embodiment of a radio wave detection device according to the present invention.
【図２】従来の電波探知装置の一例のブロック図であ
る。FIG. 2 is a block diagram of an example of a conventional radio wave detection device.
１ 指向性空中線 ２ 無指向性空中線 ３ 振幅比較回路 ４ 受信レベル検出回路 ５ 合成回路 DESCRIPTION OF SYMBOLS 1 Directivity antenna 2 Non-directional antenna 3 Amplitude comparison circuit 4 Reception level detection circuit 5 Synthesis circuit
Claims (1)
記各空中線の受信レベルを比較して指向性空中線の主ビ
ームで受信した電波と判定する旨の信号を出力する振幅
比較回路とを備える電波探知装置において、前記無指向
性空中線の受信レベルと、その受信雑音レベルに基づい
て設定したレベル値とを比較し、受信レベルが設定レベ
ル以下であるときに信号を出力する受信レベル検出回路
と、前記振幅比較回路と受信レベル検出回路の各出力の
論理和をとる合成回路とを有し、この合成回路の出力に
より主ビームで受信した電波と判定することを特徴とす
る電波探知装置。A directional antenna, an omnidirectional antenna, and an amplitude comparison circuit that compares the reception level of each of the antennas and outputs a signal indicating that the radio wave is received by the main beam of the directional antenna. A reception level detection circuit that compares a reception level of the omnidirectional antenna with a level value set based on the reception noise level, and outputs a signal when the reception level is equal to or lower than the set level. And a synthesizing circuit for performing a logical sum of the outputs of the amplitude comparing circuit and the reception level detecting circuit, and the output of the synthesizing circuit determines that the radio wave is received by the main beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34237191A JP2964752B2 (en) | 1991-11-30 | 1991-11-30 | Radio wave detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34237191A JP2964752B2 (en) | 1991-11-30 | 1991-11-30 | Radio wave detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05150027A JPH05150027A (en) | 1993-06-18 |
| JP2964752B2 true JP2964752B2 (en) | 1999-10-18 |
Family
ID=18353215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34237191A Expired - Lifetime JP2964752B2 (en) | 1991-11-30 | 1991-11-30 | Radio wave detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2964752B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003107144A (en) | 2001-09-28 | 2003-04-09 | Matsushita Electric Ind Co Ltd | Radio wave azimuth and position detection device |
-
1991
- 1991-11-30 JP JP34237191A patent/JP2964752B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05150027A (en) | 1993-06-18 |
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