JPS6322544Y2 - - Google Patents
Info
- Publication number
- JPS6322544Y2 JPS6322544Y2 JP1981127453U JP12745381U JPS6322544Y2 JP S6322544 Y2 JPS6322544 Y2 JP S6322544Y2 JP 1981127453 U JP1981127453 U JP 1981127453U JP 12745381 U JP12745381 U JP 12745381U JP S6322544 Y2 JPS6322544 Y2 JP S6322544Y2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- response
- frequency
- coil
- circuit
- 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
Links
- 238000010586 diagram Methods 0.000 description 4
- 238000013459 approach Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Description
【考案の詳細な説明】
本考案は他の装置例えば自動列車停止装置
（ATS）への干渉を防止するための干渉防止機能
を付した対象物識別装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an object identification device with an interference prevention function for preventing interference with other devices, such as an automatic train stop system (ATS).
一般にそれぞれ共振周波数が異なる複数個の共
振回路を含む応答装置に対して、送信装置から周
波数掃引信号を送出し、前記応答装置からの周波
数掃引応答信号を受信装置で処理することによつ
て、応答装置を有する対象物の固有の情報を識別
するシステムとしては、第１図に示すような識別
システムが知られている。 In general, a transmitter sends a frequency sweep signal to a response device that includes a plurality of resonant circuits each having a different resonance frequency, and a reception device processes the frequency sweep response signal from the response device. As a system for identifying unique information of an object having a device, an identification system as shown in FIG. 1 is known.
このシステムにおいては、掃引信号発生器１か
らの中波帯の周波数掃引信号を電力増幅器２で増
幅し、質問コイル、例えば送受信コイル３から応
答装置４に向けて質問信号を送出する。応答装置
４は、例えば高速走行する電車の一部に取り付け
られており、送受信コイル３に接近すると、前記
質問信号を電磁結合により応答コイル５で受信す
る。このコイル５には、コンデンサ６を介して並
列接続される複数個の共振回路７1，７2，……７
ｏを有している。各共振回路７1，７2，……７o
は、セラミツクやクリスタルのような圧電素子、
Ｌ，Ｃ，Ｒによる集中定数回路、あるいはこれを
含んだ能動素子で構成することができる。 In this system, a medium-wave frequency sweep signal from a sweep signal generator 1 is amplified by a power amplifier 2, and an interrogation signal is sent from an interrogation coil, for example, a transceiver coil 3, to a response device 4. The response device 4 is attached to, for example, a part of a train running at high speed, and when the response device 4 approaches the transmitting/receiving coil 3, the response coil 5 receives the interrogation signal through electromagnetic coupling. This coil 5 has a plurality of resonant circuits 7 1 , 7 2 , . . . 7 connected in parallel via a capacitor 6.
It has o . Each resonant circuit 7 1 , 7 2 , ...7 o
is a piezoelectric element such as ceramic or crystal,
It can be constructed from a lumped constant circuit made up of L, C, and R, or an active element including this.
従つて、質問信号の周波数が共振周波数になる
と、共振素子が直列共振回路であれば、共振回路
のインピーダンスが低下して、応答コイル５に大
きい電流が流れることから、応答コイル５から共
振回路７1，７2，……７oに対応して応答信号が
送出される。その応答信号は送受信コイル３に誘
導され、帯域波器８により所要帯域の信号のみ
を取り出す。また上記応答コイル５から送受信コ
イル３に対する信号送出は、送受信コイル３から
応答装置４を見たインピーダンス、あるいは位相
の変化とみなせるので、掃引信号発生器１からの
信号を移相器９を介して例えばπ/2ラジアン移相
し、これを基準位相として送受信コイル３の信号
を位相検波器１０で比較して前記位相変化を検出
することができる。 Therefore, when the frequency of the interrogation signal reaches the resonant frequency, if the resonant element is a series resonant circuit, the impedance of the resonant circuit decreases and a large current flows through the response coil 5. 1 , 7 2 , . . . 7 o , response signals are sent. The response signal is guided to the transmitter/receiver coil 3, and the bandpass filter 8 extracts only the signal in the required band. Furthermore, since the signal sent from the response coil 5 to the transmitter/receiver coil 3 can be regarded as a change in impedance or phase when looking at the response device 4 from the transmitter/receiver coil 3, the signal from the sweep signal generator 1 is transmitted via the phase shifter 9. For example, the phase can be shifted by π/2 radians, and the phase change can be detected by comparing the signals of the transmitting/receiving coil 3 with the phase detector 10 using this as a reference phase.
この位相検波器１０は、リング変調器のような
入力信号と、基準信号の振幅および位相差とに比
例する積形式の検波器が検出感度のうえからも好
ましいが、レシオ検波器のような位相検波器も使
用することができる。そして位相検波器１０の出
力信号はシユミツト回路の如きレベル検出器１１
でバイナリ信号に変換される。このバイナリ信号
に含まれている雑音成分は雑音除去回路１２によ
り除去され、さらに誤り判定回路１３により誤識
別率が充分小さくされて対象物の識別が行われ
る。 This phase detector 10 is preferably a product-type detector proportional to the amplitude and phase difference between an input signal and a reference signal, such as a ring modulator, from the viewpoint of detection sensitivity, but a phase detector such as a ratio detector is preferable. Detectors can also be used. The output signal of the phase detector 10 is then sent to a level detector 11 such as a Schmitts circuit.
is converted into a binary signal. The noise component contained in this binary signal is removed by the noise removal circuit 12, and the error determination circuit 13 further reduces the misidentification rate sufficiently to identify the object.
しかしながら上述したような従来の対象物識別
装置では、常に送受信コイル３から対象物を識別
するのに必要な比較的広帯域の中波帯の周波数掃
引信号を送出しているので、この周波数掃引信号
の一部の周波数が自動列車停止装置等の他の装置
へ干渉するというおそれがあつた。 However, in the conventional object identification device as described above, since the transmitting/receiving coil 3 always sends out a frequency sweep signal in a relatively wide medium wave band necessary for identifying the object, the frequency sweep signal of this frequency sweep signal is There was a fear that some frequencies could interfere with other equipment such as automatic train stopping equipment.
本考案は上記の事情に鑑みてなされたもので、
応答装置からの応答信号のうち所定周波数帯域の
信号を検知して対象物の有無を判定し、この判定
結果により送出する周波数掃引信号の周波数帯域
を制御することによつて、前記他の装置への干渉
を防止し得る対象物識別装置を提供するものであ
る。 This idea was made in view of the above circumstances.
Among the response signals from the response device, a signal in a predetermined frequency band is detected to determine the presence or absence of an object, and the frequency band of the frequency sweep signal to be sent is controlled based on the determination result, thereby transmitting the signal to the other device. The object of the present invention is to provide an object identification device that can prevent interference between objects.
以下図面を参照して本考案の一実施例を詳細に
説明する。 An embodiment of the present invention will be described in detail below with reference to the drawings.
第２図に示す対象物識別装置は、第１図を参照
して前述した従来装置に比べて、高域波器２
１、受信判定回路２２、切換回路２３を付加した
点が異なり、その他は同じであるから第２図中第
１図と同一部分は同一符号を付してその説明を省
略する。 The object identification device shown in FIG. 2 is different from the conventional device described above with reference to FIG.
1. The difference is that a reception determination circuit 22 and a switching circuit 23 are added, and the rest is the same, so the same parts in FIG. 2 as in FIG.
掃引信号発生器１は、第３図ａに示すような中
波帯の周波数掃引信号（周波数範囲L〜H，例え
ばL＝260kHz，H＝530kHz）を発生する。ここで
本実施例では掃引信号のうち周波数Lから中間の
周波数Iまでの成分が他の装置例えば自動列車停
止装置へ干渉するおそれがあるものとして説明す
る。そこで前記高域波器２１は、掃引信号発生
器１からの掃引信号入力のうち第３図ｂに示すよ
うに周波数L〜Iを遮断し、所定周波数I〜Hの
信号を通過させるように構成されている。 The sweep signal generator 1 generates a medium wave frequency sweep signal (frequency range L to H , for example L =260 kHz, H =530 kHz) as shown in FIG. 3a. In this embodiment, a description will be given on the assumption that components of the sweep signal from frequency L to intermediate frequency I may interfere with other devices, such as an automatic train stop device. Therefore, the high-frequency wave generator 21 is configured to cut off frequencies L to I of the sweep signal input from the sweep signal generator 1 and pass signals of predetermined frequencies I to H , as shown in FIG. 3b. has been done.
また切換回路２３は、受信判定回路２２の出力
により切換制御されるものであり、後述する判定
条件により受信判定回路２２の出力が「１」の場
合は掃引信号発生器１からの掃引信号を選択し、
逆に「０」の場合は高域波器２１の通過信号を
選択して電力増幅器２へ供給する。そして受信判
定回路２２は、雑音除去回路１２の出力信号を入
力とし、周波数帯域I〜Hに相当する応答装置４
の応答信号の有無を判定するものであり、第３図
ｃに示すように周波数帯域I〜Hに対する応答信
号がある場合は「１」を出力し、応答信号がない
場合は「０」を出力する。 Further, the switching circuit 23 is switched and controlled by the output of the reception judgment circuit 22, and selects the sweep signal from the sweep signal generator 1 when the output of the reception judgment circuit 22 is "1" according to the judgment conditions described later. death,
Conversely, in the case of "0", the signal passing through the high frequency amplifier 21 is selected and supplied to the power amplifier 2. The reception determination circuit 22 inputs the output signal of the noise removal circuit 12, and receives the output signal from the response device 4 corresponding to the frequency band I to H.
As shown in Figure 3c, if there is a response signal for the frequency band I to H , it outputs "1", and if there is no response signal, it outputs "0". do.
したがつて切換回路２３の出力は第３図ｄに示
すように、応答信号がない（つまり識別対象とな
る応答装置がない）場合には周波数I〜Hの掃引
信号となり、応答信号がある（つまり応答装置が
ある）場合には周波数L〜Hの掃引信号となる。
このように応答装置の有無に応じて切換回路２３
の出力の周波数帯域が切り換えられるため、送受
信コイル３から送出される信号も同様に切り換え
られ、応答装置がある場合は必要な周波数範囲L
〜Hの掃引により対象物が識別され、応答装置が
ない場合は前記他の装置に干渉するおそれのある
周波数信号は送出されない。 Therefore, as shown in FIG. 3d, the output of the switching circuit 23 becomes a sweep signal of frequencies I to H when there is no response signal (that is, there is no response device to be identified), and when there is a response signal ( In other words, if there is a response device), the signal will be a sweep signal with frequencies L to H.
In this way, the switching circuit 23
Since the frequency band of the output of
The object is identified by the sweep of ~ H , and in the absence of a response device, no frequency signal is transmitted that could interfere with the other devices.
なお上記実施例では、高域波器２１および切
換回路２３により送信する周波数帯域を切り換え
たが、これに限らず、受信判定回路２２の出力に
より掃引信号発生器１の周波数掃引信号の周波数
帯域を制御するようにしてもよい。 Note that in the above embodiment, the frequency band to be transmitted is switched by the high frequency generator 21 and the switching circuit 23, but the present invention is not limited to this, and the frequency band of the frequency sweep signal of the sweep signal generator 1 is It may also be controlled.
上述したように本考案によれば、対象物が存在
する場合にのみ対象物を識別するに必要な中波帯
の周波数掃引信号を送出し、対象物が存在しない
場合は所定周波数帯域の掃引信号を送出するよう
にしたので、自動列車停止装置等の他の装置への
干渉を防止し得る対象物識別装置を提供できる。 As described above, according to the present invention, the frequency sweep signal in the medium wave band necessary for identifying the object is sent only when the object is present, and the sweep signal in the predetermined frequency band is sent when the object is not present. Since it is configured to send out the object identification device, it is possible to provide an object identification device that can prevent interference with other devices such as an automatic train stop device.
第１図は従来の対象物識別装置を示す構成説明
図、第２図は本考案に係る対象物識別装置の一実
施例を示す構成説明図、第３図ａ乃至ｄは第２図
の動作説明のために示すタイミング図である。
１……掃引信号発生器、３……送受信コイル、
４……応答装置、２１……高域波器、２２……
受信判定回路、２３……切換回路。
FIG. 1 is a configuration explanatory diagram showing a conventional object identification device, FIG. 2 is a configuration explanatory diagram showing an embodiment of the object identification device according to the present invention, and FIGS. 3 a to 3 d are operation diagrams of FIG. 2. FIG. 3 is a timing diagram shown for explanation. 1...Sweep signal generator, 3...Transmission/reception coil,
4...Response device, 21...High frequency device, 22...
Reception determination circuit, 23... switching circuit.
Claims (1)
電磁的に結合して中波帯の質問信号である周波数
掃引信号を送出し、前記応答装置からの応答信号
を受信する質問コイルと、この質問コイルが前記
応答信号のうち所定周波数帯域の信号を検知する
ことにより前記対象物の有無を判定する判定回路
と、この判定回路により得られた判定結果に応じ
て前記応答コイルへ送出される前記周波数掃引信
号の周波数帯域を制御する回路とを具備すること
を特徴とする対象物識別装置。 An interrogation coil that electromagnetically couples with a response coil of a response device attached to a target object to transmit a frequency sweep signal that is a medium wave band interrogation signal, and receives a response signal from the response device; and this interrogation coil. a determination circuit that determines the presence or absence of the object by detecting a signal in a predetermined frequency band among the response signals; and a frequency sweep that is sent to the response coil according to the determination result obtained by the determination circuit. 1. An object identification device comprising: a circuit for controlling a frequency band of a signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12745381U JPS5832478U (en) | 1981-08-28 | 1981-08-28 | Object identification device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12745381U JPS5832478U (en) | 1981-08-28 | 1981-08-28 | Object identification device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5832478U JPS5832478U (en) | 1983-03-03 |
| JPS6322544Y2 true JPS6322544Y2 (en) | 1988-06-21 |
Family
ID=29921181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12745381U Granted JPS5832478U (en) | 1981-08-28 | 1981-08-28 | Object identification device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5832478U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56119868A (en) * | 1980-02-27 | 1981-09-19 | Toshiba Corp | Object discriminator |
-
1981
- 1981-08-28 JP JP12745381U patent/JPS5832478U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56119868A (en) * | 1980-02-27 | 1981-09-19 | Toshiba Corp | Object discriminator |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5832478U (en) | 1983-03-03 |
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