JP2000011294A - Leak transmission line communication system - Google Patents
Leak transmission line communication systemInfo
- Publication number
- JP2000011294A JP2000011294A JP10179078A JP17907898A JP2000011294A JP 2000011294 A JP2000011294 A JP 2000011294A JP 10179078 A JP10179078 A JP 10179078A JP 17907898 A JP17907898 A JP 17907898A JP 2000011294 A JP2000011294 A JP 2000011294A
- Authority
- JP
- Japan
- Prior art keywords
- vehicle
- transmission line
- road
- leaky
- waveguide
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 34
- 238000004891 communication Methods 0.000 title claims description 15
- 230000005855 radiation Effects 0.000 claims abstract description 19
- 230000007423 decrease Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Traffic Control Systems (AREA)
- Near-Field Transmission Systems (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、マイクロ波等の高
周波信号を伝送し、特に、道路に沿って布設される漏洩
伝送線路を用いた通信方式に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system for transmitting high-frequency signals such as microwaves, and more particularly, to a communication system using a leaky transmission line laid along a road.
【０００２】[0002]
【従来の技術】道路利用の効率化、安全性の向上等を目
的として、自動車などの車両との間で常に信号を送受で
きるようにする路車間通信システムが実用化されてい
る。この路車間通信システムにおいては、等価的に連続
的なアンテナと見なすことのできる漏洩伝送線路が道路
に沿って布設される。そしてこの漏洩伝送線路として
は、漏洩同軸ケーブルや漏洩導波管を使用することがで
きるが、ここでは漏洩導波管を使用した例を用いて説明
する。2. Description of the Related Art A road-to-vehicle communication system has been put to practical use for constantly transmitting and receiving signals to and from a vehicle such as an automobile for the purpose of improving the efficiency of road use and improving safety. In this road-vehicle communication system, a leaky transmission line that can be regarded as an equivalently continuous antenna is laid along the road. As the leaky transmission line, a leaky coaxial cable or a leaky waveguide can be used. Here, an example using a leaky waveguide will be described.
【０００３】漏洩導波管の一例を図４，５に示す。図４
にはこの漏洩導波管の構成が示されている。漏洩導波管
１′は銅材を楕円形に加工した空中導体２を主体に構成
されている。この空中導体の側部には、長手方向に向け
て一定間隔に漏洩電波を生じさせるための漏洩孔３が設
けられている。この漏洩孔３を適当な間隔で設けること
によって、漏洩電波の放射方向を任意に決定できる。放
射方向をθ、漏洩孔の間隔をＰ/２とすると、間隔と放
射方向の関係は、次の数１で表される。An example of a leaky waveguide is shown in FIGS. FIG.
2 shows the configuration of this leaky waveguide. The leaky waveguide 1 'is mainly composed of an aerial conductor 2 obtained by processing a copper material into an elliptical shape. A leak hole 3 for generating a leak radio wave at regular intervals in the longitudinal direction is provided on a side portion of the air conductor. By providing the leak holes 3 at appropriate intervals, the radiation direction of the leaked radio wave can be arbitrarily determined. Assuming that the radiation direction is θ and the interval between the leak holes is P / 2, the relationship between the interval and the radiation direction is expressed by the following equation 1.
【数１】 但し、η＝０，±１，±２，……、υは漏洩導波管内の
波長短縮率、λは波長である。(Equation 1) Here, η = 0, ± 1, ± 2,..., Υ is the wavelength reduction ratio in the leaky waveguide, and λ is the wavelength.
【０００４】通常、漏洩導波管１′からの放射角度は、
ケーブルに対して垂直方向に近い方向が選ばれる。この
ような漏洩導波管などの輻射状況は、一般には指向性と
して示される。漏洩導波管１′の指向性の例を図５に示
す。指向性は、放射強度だけでなく、受信強度の角度依
存性も示す。すなわち、図５のようにある角度に指向性
が大きい場合には、その方向に強く電波が放射されてい
るだけでなく、その方向からの電波を最も大きく受信す
るということを意味する。Usually, the radiation angle from the leaky waveguide 1 'is
A direction close to the direction perpendicular to the cable is selected. The radiation situation of such a leaky waveguide is generally indicated as directivity. An example of the directivity of the leaky waveguide 1 'is shown in FIG. The directivity indicates not only the radiation intensity but also the angle dependence of the reception intensity. That is, when the directivity is large at a certain angle as shown in FIG. 5, it means that not only the radio wave is radiated strongly in that direction, but also that the radio wave from that direction is received most.
【０００５】一方、自動車などの車両に搭載した車両ア
ンテナは、漏洩導波管１′との送受信を有効にできるよ
うに、漏洩導波管１′からの電波を受信するのに適した
指向性をもっている。On the other hand, a vehicle antenna mounted on a vehicle such as an automobile has a directivity suitable for receiving radio waves from the leaky waveguide 1 'so that transmission and reception with the leaky waveguide 1' can be made effective. Have.
【０００６】このような漏洩導波管１′に沿った電波放
射の状況を模式的に図６に示す。図中矢印は電波の輻射
方向を示す。漏洩導波管１′一端には、送受信機４が接
続される。送受信機４からの信号は、漏洩導波管１′を
介して、車両５に伝送される。FIG. 6 schematically shows the state of radio wave radiation along such a leaky waveguide 1 ′. Arrows in the figure indicate the radiation direction of radio waves. A transceiver 4 is connected to one end of the leaky waveguide 1 '. The signal from the transceiver 4 is transmitted to the vehicle 5 via the leaky waveguide 1 '.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、このよ
うな従来の方法では、漏洩伝送線路に沿って車両が並走
した場合に、漏洩伝送線路側の車両が電波伝搬をブロッ
クし、外側の車両へ十分な強度の電波が伝わらず、通信
を確保できない場合が生じるという問題がある。However, in such a conventional method, when vehicles run in parallel along the leaky transmission line, the vehicle on the leaky transmission line side blocks the radio wave propagation and sends the signal to the outside vehicle. There is a problem that radio waves of sufficient intensity are not transmitted and communication cannot be secured.
【０００８】そこで本発明は、このような従来の漏洩伝
送線路通信方式のもつ問題を解消し、車両が並走状態に
あっても、漏洩伝送線路からの遮蔽される確率を小さく
することができる漏洩伝送線路通信方式を提供すること
を目的としている。Accordingly, the present invention solves such a problem of the conventional leaky transmission line communication system, and can reduce the probability of being shielded from the leaky transmission line even when the vehicles are running side by side. It is an object of the present invention to provide a leaky transmission line communication system.
【０００９】[0009]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明は、道路に沿って布設された漏洩伝送線路
を空中線として用いることにより、通行車両と地上側の
間で情報の伝達を行う路車間通信システムにおいて、請
求項１に記載の発明は、漏洩伝送線路より、複数の異な
る輻射角を有する電波を輻射させ、車両側で適当な電波
を選択して受信することを特徴とするものである。In order to achieve the above object, the present invention uses a leaky transmission line laid along a road as an antenna to transmit information between a passing vehicle and a ground side. In the road-vehicle communication system, the invention according to claim 1 is characterized in that radio waves having a plurality of different radiation angles are radiated from a leaky transmission line, and an appropriate radio wave is selected and received on the vehicle side. Is what you do.
【００１０】同路車間通信システムにおいて、請求項２
に記載の発明は、漏洩伝送線路より、複数の異なる輻射
角を有する電波を輻射させ、車両側で常にこの電波を合
成して受信することを特徴とするものである。[0010] In the same road-to-vehicle communication system,
The invention described in (1) is characterized in that radio waves having a plurality of different radiation angles are radiated from the leaky transmission line, and the radio waves are always synthesized and received on the vehicle side.
【００１１】これらの方式によれば、並走する車両が漏
洩伝送線路の設置側のレーンにあって、漏洩伝送線路か
らの漏洩電波のうちのいくつかが遮られても、漏洩伝送
線路に対して遠方にある車両に電波が到達する。従って
漏洩伝送線路からの電波が並走される車両により遮蔽さ
れる確率が小さくなる。According to these methods, even if a vehicle running in parallel is on the lane on the installation side of the leaky transmission line and some of the leaked radio waves from the leaky transmission line are blocked, the vehicle will not be able to control the leaky transmission line. Radio waves reach vehicles that are far away. Therefore, the probability that the radio wave from the leaky transmission line is shielded by the parallel running vehicle is reduced.
【００１２】[0012]
【発明の実施の形態】以下、本発明の実施の形態を添付
図面に基づいて説明する。この実施の形態においては、
漏洩伝送線路として漏洩同軸ケーブルや漏洩導波管を使
用することができるが、ここでは漏洩導波管を使用した
例を用いて説明する。図１は、本発明による漏洩導波管
１の指向性を示しており、これから電波は、正面方向だ
けでなく、斜め方向にも輻射されていることが分かる。
このようなサイドローブを得るために、同位相の電波を
輻射するスロットを、搬送波周波数の漏洩導波管１内の
波長λgと同程度の間隔として設置する。又は位相の90
°異なる電波を輻射するようなスロットを、λg/２の間
隔で設置する。Embodiments of the present invention will be described below with reference to the accompanying drawings. In this embodiment,
Although a leaky coaxial cable or a leaky waveguide can be used as the leaky transmission line, an example using a leaky waveguide will be described here. FIG. 1 shows the directivity of the leaky waveguide 1 according to the present invention, from which it can be seen that radio waves are radiated not only in the front direction but also in the oblique direction.
In order to obtain such side lobes, slots for radiating radio waves having the same phase are provided at intervals substantially equal to the wavelength λ g in the leaky waveguide 1 having the carrier frequency. Or 90 in phase
° Slots that radiate different radio waves are installed at an interval of λ g / 2.
【００１３】このような輻射をするスロットパターンを
図２(ａ)〜(ｄ)に示す。このうち、図２(ａ)は垂直偏
波、図２(ｂ)は水平偏波、図２(ｃ)は円偏波を輻射す
る。また、図２(ｄ)は正面方向に円偏波を、斜め方向に
水平偏波を輻射する。FIGS. 2A to 2D show slot patterns which emit such radiation. 2A radiates vertically polarized waves, FIG. 2B radiates horizontally polarized waves, and FIG. 2C radiates circularly polarized waves. FIG. 2D radiates circularly polarized waves in the front direction and horizontally polarized waves in the oblique direction.
【００１４】図３は、この輻射パターンを有する漏洩導
波管１を道路に沿って布設した形態を示し、図中、矢印
は電波の輻射方向を示す。道路上を車両５ａ，５ｂが並
走しているとする。この道路の片側に、漏洩導波管１が
布設されている。漏洩導波管１からのビームＡは、漏洩
導波管１側の車両５ａに遮られて車両５ｂに届かない
が、ビームＢ又はビームＣは車両の前後を通り、車両５
ｂに到達できる。FIG. 3 shows a form in which the leaky waveguide 1 having this radiation pattern is laid along a road. In the figure, arrows indicate the radiation direction of radio waves. It is assumed that vehicles 5a and 5b are running in parallel on the road. A leaky waveguide 1 is laid on one side of this road. The beam A from the leaky waveguide 1 is blocked by the vehicle 5a on the leaky waveguide 1 side and does not reach the vehicle 5b, but the beam B or the beam C passes before and after the vehicle, and
b can be reached.
【００１５】そこで、車両５ｂでは、ビームＡ、ビーム
Ｂ、ビームＣのうち強度の強い信号を選択して受信する
ことにより、並走車両により妨害される確率を小さくす
ることができる。また、車両５ｂでは、ビームＡ、ビー
ムＢ、ビームＣを合成した信号をうることとなり、通信
することでも同様の効果を得ることができる。なお、こ
こでは説明の便宜上、乗用車を用いて説明したが、本発
明の適用においては、車種を問わない。In the vehicle 5b, by selecting and receiving a signal having a high intensity among the beams A, B, and C, the probability of interference by the parallel running vehicle can be reduced. In the vehicle 5b, a signal obtained by combining the beam A, the beam B, and the beam C is obtained, and the same effect can be obtained by communicating. Here, for convenience of explanation, the description has been made using a passenger car, but the present invention is not limited to the type of vehicle.
【００１６】このように、漏洩導波管１から輻射角の異
なる電波を送受信することにより、漏洩導波管１側を並
走する車両による通信の妨害を抑えることができる。As described above, by transmitting and receiving radio waves having different radiation angles from the leaky waveguide 1, it is possible to suppress communication interruption by a vehicle running in parallel with the leaky waveguide 1.
【００１７】[0017]
【発明の効果】本発明は前記のようであって、請求項１
に記載の発明は、漏洩伝送線路から、方向の異なる電波
を輻射し、車両側で適当な電波を選択して受信するよう
にしたため、並走する車両により著しく受信レベルが低
下する確率を小さくすることができるという効果があ
る。The present invention is as described above.
The invention described in (1) radiates radio waves in different directions from the leaky transmission line and selects and receives an appropriate radio wave on the vehicle side, so that the probability that the reception level is significantly reduced by the parallel running vehicle is reduced. There is an effect that can be.
【００１８】請求項２に記載の発明は、漏洩伝送線路か
ら、方向の異なる電波を輻射し、車両側で常にこの電波
を合成して受信するようにしたため、並走する車両によ
り著しく受信レベルが低下する確率を小さくすることが
できるという効果がある。According to the second aspect of the present invention, radio waves having different directions are radiated from the leaky transmission line, and the radio waves are always synthesized and received by the vehicle side. There is an effect that the probability of reduction can be reduced.
【図１】本発明の漏洩伝送線路の実施形態の特性図であ
る。FIG. 1 is a characteristic diagram of an embodiment of a leaky transmission line according to the present invention.
【図２】同上の漏洩伝送線路の特性を実現する状態を示
す正面図であって、(ａ)は垂直偏波を、(ｂ)は水平偏波
を、(ｃ)は円偏波を、(ｄ)は正面方向に円偏波を、斜め
方向に水平偏波を輻射する状態を示す。FIG. 2 is a front view showing a state of realizing the characteristics of the above-described leaky transmission line, wherein (a) shows vertical polarization, (b) shows horizontal polarization, (c) shows circular polarization, (d) shows a state in which circularly polarized waves are radiated in the front direction and horizontal polarized waves are radiated in the oblique direction.
【図３】同上の漏洩伝送線路の使用状態を示す説明図で
ある。FIG. 3 is an explanatory diagram showing a usage state of the leaky transmission line of the above.
【図４】本発明の漏洩伝送線路と同様の従来の漏洩伝送
線路の斜視図である。FIG. 4 is a perspective view of a conventional leaky transmission line similar to the leaky transmission line of the present invention.
【図５】同上の漏洩伝送線路の特性図である。FIG. 5 is a characteristic diagram of the leaky transmission line of the above.
【図６】同上の漏洩伝送線路の使用状態を示す説明図で
ある。FIG. 6 is an explanatory diagram showing a use state of the leaky transmission line of the above.
１ 漏洩伝送線路 ２ 導体 ３ 貫通孔 ４ 送受信機 ５ 車両 DESCRIPTION OF SYMBOLS 1 Leaky transmission line 2 Conductor 3 Through hole 4 Transceiver 5 Vehicle
───────────────────────────────────────────────────── フロントページの続き (72)発明者 日下 眞二 茨城県日立市日高町５丁目１番１号 日立 電線株式会社日高工場内 (72)発明者 亘理 達 茨城県日立市砂沢町880番地 日立電線株 式会社高砂工場内 (72)発明者 安藤 敏之 茨城県日立市砂沢町880番地 日立電線株 式会社高砂工場内 (72)発明者 楊 暁冬 茨城県日立市砂沢町880番地 日立電線株 式会社高砂工場内 Ｆターム(参考） 5H180 BB04 CC30 5K012 AA03 AB02 AB05 AC05 AC07 AC08 AC10 AE06 BA03 5K067 DD51 EE35 EE39 EE44 FF02 GG01 GG11 KK02 KK03 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shinji Kusaka 5-1-1 Hidakacho, Hitachi City, Ibaraki Prefecture Inside the Hidaka Plant, Hitachi Cable Co., Ltd. No. Hitachi Cable Co., Ltd. Takasago Plant (72) Inventor Toshiyuki Ando 880 Sunasawa-cho, Hitachi City, Ibaraki Prefecture F-term in Takasago Plant Co., Ltd. (Reference) 5H180 BB04 CC30 5K012 AA03 AB02 AB05 AC05 AC07 AC08 AC10 AE06 BA03 5K067 DD51 EE35 EE39 EE44 FF02 GG01 GG11 KK02 KK03
Claims (2)
空中線として用いることにより、通行車両と地上側の間
で情報の伝達を行う路車間通信システムにおいて、漏洩
伝送線路より、複数の異なる輻射角を有する電波を輻射
させ、車両側で適当な電波を選択して受信することを特
徴とする漏洩伝送線路通信方式。1. A road-vehicle communication system for transmitting information between a passing vehicle and a ground side by using a leaky transmission line laid along a road as an antenna, a plurality of different radiations from the leaky transmission line. A leaky transmission line communication system characterized in that a radio wave having an angle is radiated and an appropriate radio wave is selected and received on a vehicle side.
空中線として用いることにより、通行車両と地上側の間
で情報の伝達を行う路車間通信システムにおいて、漏洩
伝送線路より、複数の異なる輻射角を有する電波を輻射
させ、車両側で常にこの電波を合成して受信することを
特徴とする漏洩ケーブル通信方式。2. A road-vehicle communication system for transmitting information between a passing vehicle and a ground side by using a leaky transmission line laid along a road as an antenna, a plurality of different radiations from the leaky transmission line. A leaky cable communication system in which a radio wave having an angle is radiated, and the radio wave is always synthesized and received by a vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10179078A JP2961258B1 (en) | 1998-06-25 | 1998-06-25 | Leaky transmission line communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10179078A JP2961258B1 (en) | 1998-06-25 | 1998-06-25 | Leaky transmission line communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2961258B1 JP2961258B1 (en) | 1999-10-12 |
| JP2000011294A true JP2000011294A (en) | 2000-01-14 |
Family
ID=16059709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10179078A Expired - Lifetime JP2961258B1 (en) | 1998-06-25 | 1998-06-25 | Leaky transmission line communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2961258B1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002314467A (en) * | 2001-04-18 | 2002-10-25 | Takeshi Nakamura | Wireless communication equipment in water |
| KR100945176B1 (en) | 2003-03-26 | 2010-03-03 | 한라공조주식회사 | Internal heat exchanger |
| US8436782B2 (en) | 2008-03-13 | 2013-05-07 | Toshiba Tec Kabushiki Kaisha | Communication antenna device |
-
1998
- 1998-06-25 JP JP10179078A patent/JP2961258B1/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002314467A (en) * | 2001-04-18 | 2002-10-25 | Takeshi Nakamura | Wireless communication equipment in water |
| KR100945176B1 (en) | 2003-03-26 | 2010-03-03 | 한라공조주식회사 | Internal heat exchanger |
| US8436782B2 (en) | 2008-03-13 | 2013-05-07 | Toshiba Tec Kabushiki Kaisha | Communication antenna device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2961258B1 (en) | 1999-10-12 |
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