JPH01142478A - Secondary radiation suppression circuit by side band antenna - Google Patents

Secondary radiation suppression circuit by side band antenna

Info

Publication number
JPH01142478A
JPH01142478A JP30040187A JP30040187A JPH01142478A JP H01142478 A JPH01142478 A JP H01142478A JP 30040187 A JP30040187 A JP 30040187A JP 30040187 A JP30040187 A JP 30040187A JP H01142478 A JPH01142478 A JP H01142478A
Authority
JP
Japan
Prior art keywords
carrier signal
side band
antenna
carrier
amplitude
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
JP30040187A
Other languages
Japanese (ja)
Inventor
Hisao Miyake
久雄 三宅
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP30040187A priority Critical patent/JPH01142478A/en
Publication of JPH01142478A publication Critical patent/JPH01142478A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To achieve a higher azimuth accuracy with the suppression of an amplitude modulation strain of a carrier signal depending on an azimuth, by controlling an amplitude and a phase of the carrier signal extracted to be applied to a side band transmission output applied to a side band antenna from a side band transmitter. CONSTITUTION:A part of a carrier signal from a carrier transmitter 11 is extracted and applied to a side band transmission output from side band transmitters 15-18 through an amplitude control circuit 13, a phase control circuit 14, 4-distributor 10 and directive connectors 24-27. In this case, the amplitude control circuit 13 and the phase control circuit 14 are adjusted so as to minimize an amplitude modulation strain of the carrier signal obtained with a monitor antenna thereby controlling an amplitude and a phase of the carrier signal applied to the side band transmission output after extracted from a carrier transmission output. This cancels the carrier signal as secondary radiation from the side band antenna, thereby suppressing the amplitude modulation strain of the carrier signal depending on an azimuth.

Description

【発明の詳細な説明】 [発明の目的] (産業上の利用分野) 本発明は航空電波航法において用いられるドツプラ方式
のVOR(VHF omnidireetional 
radi。
[Detailed description of the invention] [Object of the invention] (Industrial application field) The present invention is a Doppler type VOR (VHF omnidirectional
radi.

rang・)におけるサイドバンドアンテナによる2次
輻射抑圧回路に関する。
This invention relates to a secondary radiation suppression circuit using a sideband antenna in .

(従来の技術) VORはVHF (112〜118 MH! )で運用
され、航空機にVOR局より見た航空機の磁北に対する
方位情報を提供するものである。VORでは全方位で一
定の位相を有する基準位相信号と受信位置の方位によシ
位相の変化する可変位相信号(方位信号)とを送信し、
その位相差が受信位置の磁方位を示す・ ドツプラ方式のVORは、第2図に示すように、ドツプ
ラ効果によるFM信号を発生させるため、キャリアアン
テナ1を中心とした水平面の円周上に等間隔に配置され
た50基のサイドバンドアンテナ2を設置し、4系統又
は2系統のサイドバンド信号を順番に切換えながら送信
している。
(Prior Art) A VOR is operated at VHF (112-118 MH!) and provides aircraft with azimuth information relative to magnetic north of the aircraft as seen from the VOR station. VOR transmits a reference phase signal that has a constant phase in all directions and a variable phase signal (azimuth signal) whose phase changes depending on the direction of the receiving position.
The phase difference indicates the magnetic direction of the receiving position. As shown in Figure 2, the Doppler VOR generates an FM signal by the Doppler effect, so it is arranged on the circumference of a horizontal plane centered on the carrier antenna 1. Fifty sideband antennas 2 arranged at intervals are installed, and four or two systems of sideband signals are transmitted while being switched in order.

しかしながら、送信状態にあるサイドバンドアンテナ2
は入力インピーダンスが低くなるため、キャリアアンテ
ナ1よシ輻射されたキャリア信号がサイドバンドアンテ
ナ2から2次輻射される。
However, the sideband antenna 2 in the transmitting state
Since the input impedance becomes low, the carrier signal radiated from the carrier antenna 1 is secondarily radiated from the sideband antenna 2.

このサイドバンドアンテナ2から2次輻射されたキャリ
ア信号はキャリアアンテナ1から輻射されたキャリア信
号と空間合成されるため、第3図(a)に示すように、
キャリア信号に振幅変調歪を発生する。また、この振幅
変調歪は、各方位によシ、キャリアアンテナ1とサイド
バンドアンテナ2から輻射されたキャリア信号の位相が
異なる為、受信点によって変調波形が異なる。このため
4分円誤差等の方位誤差が発生する。また、振幅変調歪
によって、不要雑音が発生する。
Since the carrier signal secondarily radiated from this sideband antenna 2 is spatially combined with the carrier signal radiated from the carrier antenna 1, as shown in FIG. 3(a),
Generates amplitude modulation distortion in the carrier signal. Moreover, this amplitude modulation distortion causes a modulation waveform to differ depending on the reception point because the phase of the carrier signal radiated from the carrier antenna 1 and the sideband antenna 2 differs depending on the direction. For this reason, orientation errors such as quadrant errors occur. Further, unnecessary noise is generated due to amplitude modulation distortion.

(発明が解決しようとする問題点) 本発明は上記の事情に鑑みてなされたもので、近接した
アンテナが存在するために発生するキャリア信号の振幅
変調歪を抑圧し、方位精度を高め、不要雑音の輻射を抑
圧するサイドバンドアンテナによる2次輻射抑圧回路を
提供することを目的とする。
(Problems to be Solved by the Invention) The present invention has been made in view of the above circumstances, and suppresses the amplitude modulation distortion of the carrier signal that occurs due to the presence of adjacent antennas, improves azimuth accuracy, and eliminates unnecessary An object of the present invention is to provide a secondary radiation suppression circuit using a sideband antenna that suppresses noise radiation.

[発明の構成] (問題点を解決するための手段と作用)本発明は上記目
的を達成するために、ドラグラ方式のVORにおいて、
キャリア送信装置からキャリアアンテナに加えられるキ
ャリア信号の一部を抽出し、この抽出したキャリア信号
の振幅及び位相を制御して、サイドバンド送信装置から
サイドバンドアンテナに加えられるサイドバンド送信出
力に加えることにより、サイドバンドアンテナから2次
輻射されるキャリア信号を打ち消すことを特徴とするも
ので、これによシ、近接したアンテナが存在するために
発生する方位によるキャリア信号の振幅変調歪を抑圧し
、方位精度管高め、不要雑音の輻射を抑圧することがで
きる。
[Structure of the Invention] (Means and Effects for Solving the Problems) In order to achieve the above object, the present invention provides the following features in drag-type VOR:
Extracting a part of the carrier signal applied to the carrier antenna from the carrier transmitter, controlling the amplitude and phase of this extracted carrier signal, and adding it to the sideband transmission output applied to the sideband antenna from the sideband transmitter. This is characterized by canceling the carrier signal secondary radiated from the sideband antenna, thereby suppressing the amplitude modulation distortion of the carrier signal due to the orientation that occurs due to the presence of nearby antennas, The azimuth accuracy can be increased and unnecessary noise radiation can be suppressed.

(実施例) 以下図面を参照して本発明の一実施例を詳細に説明する
(Example) An example of the present invention will be described in detail below with reference to the drawings.

第1図は本発明の一実施例を示し、キャリア送信装置1
1の出力端はキャリアアンテナ12に接続されると共に
振幅制御回路13及び位相制御回路14を介して4分配
器100入力端に接続される。一方、サイドバンド送信
装置15.16.17゜18の出力端はディストビエー
タ19を介して夫々対応したサイドバンドアンテナ20
.21゜22.23に接続される。前記各サイドバンド
送信装置15〜I8とデイストリビュー夕19との接続
線には夫々対応した方向性結合器24.25゜26.2
7を介して前記4分配器10の出力端が結合される。
FIG. 1 shows an embodiment of the present invention, in which a carrier transmitter 1
The output terminal of 1 is connected to the carrier antenna 12 and is also connected to the input terminal of the 4-way divider 100 via the amplitude control circuit 13 and the phase control circuit 14. On the other hand, the output ends of the sideband transmitters 15, 16, 17, 18 are connected to the corresponding sideband antennas 20 via the distributor 19.
.. Connected to 21°22.23. Directional couplers 24.25°26.2 are connected to the connection lines between each of the sideband transmitters 15 to I8 and the distribution device 19, respectively.
The output end of the four-way divider 10 is coupled via 7.

即ち、キャリア送信装置11からのキャリア信号はキャ
リアアンテナ12がら空中へ輻射される。
That is, the carrier signal from the carrier transmitter 11 is radiated into the air through the carrier antenna 12.

一方、各サイドバンド送信装置15〜18からのサイド
バンド信号はディストビエータ19を通して夫々対応し
たサイドバンドアンテナ20〜23がら空中へ輻射され
る。この場合、キャリア送信装置11からのキャリア信
号の一部は抽出され振幅制御回路13、位相制御回路1
4.4分配器10、及び方向性結合器24〜22を通し
てサイドバンド送信装置15〜18からのサイドバンド
送信出力に加えられる。この場合、モニタアンテナによ
つて得られるキャリア信号の振幅変調歪が最小となるよ
うに、振幅制御回路13及び位相制御回路14を調節し
、キャリア送信出力から抽出しサイドバンド送信出力に
加えるキャリア信号の振幅と位相を制御する。すなわち
、サイドバンドアンテナ20〜23から2次輻射される
キャリア信号と同振幅で逆位相のキャリア信号をサイド
バンド送信出力に加えるようにする。このように、サイ
ドバンドアンテナから2次輻射されるキャリア信号を打
ち消すことによシ、第3図(b)に示すように、方位に
よるキャリア信号の振幅変調歪を抑圧することができ、
方位精度を向上し、同時に不要雑音も抑圧することがで
きる。
On the other hand, the sideband signals from each of the sideband transmitters 15 to 18 are radiated into the air through the distoviator 19 through the corresponding sideband antennas 20 to 23, respectively. In this case, a part of the carrier signal from the carrier transmitter 11 is extracted, and the amplitude control circuit 13 and the phase control circuit 1
The signal is added to the sideband transmission outputs from the sideband transmitters 15 to 18 through the 4.4 divider 10 and the directional couplers 24 to 22. In this case, the amplitude control circuit 13 and the phase control circuit 14 are adjusted so that the amplitude modulation distortion of the carrier signal obtained by the monitor antenna is minimized, and the carrier signal extracted from the carrier transmission output and added to the sideband transmission output is adjusted. control the amplitude and phase of That is, a carrier signal having the same amplitude and opposite phase as the carrier signal secondarily radiated from the sideband antennas 20 to 23 is added to the sideband transmission output. In this way, by canceling the carrier signal that is secondarily radiated from the sideband antenna, it is possible to suppress the amplitude modulation distortion of the carrier signal due to the azimuth, as shown in FIG. 3(b).
Direction accuracy can be improved and unnecessary noise can be suppressed at the same time.

[発明の効果コ 以上述べたように本発明によれば、サイドバンドアンテ
ナから2次輻射されるキャリア信号を打ち消すことによ
シ、キャリア信号の振幅変調歪を抑圧でき、方位精度を
向上でき、巣に不要雑音を抑圧できる。
[Effects of the Invention] As described above, according to the present invention, by canceling the carrier signal secondary radiated from the sideband antenna, the amplitude modulation distortion of the carrier signal can be suppressed, and the azimuth accuracy can be improved. Unwanted noise can be suppressed in the nest.

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

第1図は本発明の一実施例を示す構成説明図、第2図は
ドラグラ方式VORのアンテナ配置を説明するための図
、第3図はキャリア信号の振幅変調歪を説明するための
図である。 I O−4分配器、11・・・キャリア送信装置、12
・・・キャリアアンテナ、13・・・振幅制御回路、1
4・・・位相制御回路、15〜1 B−・・サイトノぐ
ンド送信装置、19・・・ディストリビュータ、20〜
23・・・サイドバンドアンテナ、24〜27・・・方
向性結合器O 出願人代理人  弁理士  鈴 江 武 彦第2図 113図
FIG. 1 is a configuration explanatory diagram showing one embodiment of the present invention, FIG. 2 is a diagram for explaining the antenna arrangement of a drag-type VOR, and FIG. 3 is a diagram for explaining amplitude modulation distortion of a carrier signal. be. IO-4 distributor, 11...carrier transmitter, 12
...Carrier antenna, 13...Amplitude control circuit, 1
4... Phase control circuit, 15~1 B-... Cytonogundo transmitter, 19... Distributor, 20~
23... Sideband antenna, 24-27... Directional coupler O Applicant's agent Patent attorney Takehiko Suzue Figure 2 Figure 113

Claims (1)

【特許請求の範囲】[Claims] ドップラ方式のVOR(VHF omnidirect
ional radio range)において、キャ
リア送信装置からキャリアアンテナに加えられるキャリ
ア信号の一部を抽出し、この抽出したキャリア信号の振
幅及び位相を制御して、サイドバンド送信装置からサイ
ドバンドアンテナに加えられるサイドバンド送信出力に
加えることにより、サイドバンドアンテナから2次輻射
されるキャリア信号を打ち消すことを特徴とするサイド
バンドアンテナによる2次輻射抑圧回路。
Doppler type VOR (VHF omnidirect
ional radio range), extracts a part of the carrier signal applied to the carrier antenna from the carrier transmitter, controls the amplitude and phase of this extracted carrier signal, and controls the amplitude and phase of the carrier signal applied to the sideband antenna from the sideband transmitter. 1. A secondary radiation suppression circuit using a sideband antenna, which cancels a carrier signal secondarily radiated from the sideband antenna by adding it to a band transmission output.
JP30040187A 1987-11-28 1987-11-28 Secondary radiation suppression circuit by side band antenna Pending JPH01142478A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP30040187A JPH01142478A (en) 1987-11-28 1987-11-28 Secondary radiation suppression circuit by side band antenna

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP30040187A JPH01142478A (en) 1987-11-28 1987-11-28 Secondary radiation suppression circuit by side band antenna

Publications (1)

Publication Number Publication Date
JPH01142478A true JPH01142478A (en) 1989-06-05

Family

ID=17884346

Family Applications (1)

Application Number Title Priority Date Filing Date
JP30040187A Pending JPH01142478A (en) 1987-11-28 1987-11-28 Secondary radiation suppression circuit by side band antenna

Country Status (1)

Country Link
JP (1) JPH01142478A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005091285A (en) * 2003-09-19 2005-04-07 Murata Mfg Co Ltd Radio beacon facility and azimuth detection method
JP2008020441A (en) * 2006-06-13 2008-01-31 Toshiba Corp Phase correction device, dvor apparatus, and phase correction method
US8031118B2 (en) 2006-06-13 2011-10-04 Kabushiki Kaisha Toshiba Phase correction apparatus, DVOR apparatus, and phase correction method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005091285A (en) * 2003-09-19 2005-04-07 Murata Mfg Co Ltd Radio beacon facility and azimuth detection method
JP4507541B2 (en) * 2003-09-19 2010-07-21 株式会社村田製作所 Radio beacon device and direction detection method
JP2008020441A (en) * 2006-06-13 2008-01-31 Toshiba Corp Phase correction device, dvor apparatus, and phase correction method
US8031118B2 (en) 2006-06-13 2011-10-04 Kabushiki Kaisha Toshiba Phase correction apparatus, DVOR apparatus, and phase correction method

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