JPH02302899A - Speed measuring instrument - Google Patents
Speed measuring instrumentInfo
- Publication number
- JPH02302899A JPH02302899A JP1125225A JP12522589A JPH02302899A JP H02302899 A JPH02302899 A JP H02302899A JP 1125225 A JP1125225 A JP 1125225A JP 12522589 A JP12522589 A JP 12522589A JP H02302899 A JPH02302899 A JP H02302899A
- Authority
- JP
- Japan
- Prior art keywords
- speed
- vehicle
- transmission
- signal
- detector
- 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
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 18
- 238000005259 measurement Methods 0.000 abstract description 14
- 238000010586 diagram Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
Landscapes
- Traffic Control Systems (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、電波のドツプラー効果(Dopplerl
Jfect)を利用して道路上を走行する車両に電波を
発射し、この電波が車両に当たって反射して帰ってくる
反射を受信、送信波と受信波との間に生ずる周波数差か
ら車両の速度を測定する装置に関するものである。[Detailed Description of the Invention] [Industrial Application Field] This invention is directed to the Doppler effect of radio waves.
Jfect) is used to emit radio waves to vehicles traveling on the road, and when these radio waves hit the vehicle and reflect back, the vehicle's speed can be determined from the frequency difference that occurs between the transmitted and received waves. This relates to a measuring device.
第2図は、従来の速度測定装置で、道路上を走行する車
両の速度を測定する装置のブロック図であり9図におい
て、(1)は被測定物体としての車両(2)はガン(c
unn)発振器などによって構成される電波源、(3)
はサーキュレータ、(4)は電波源(2)からの電波を
送信波(5)として車両(1)に向けて発射し、かつ、
車両(1)からの反射波(6)を受信するアンテナ、(
8)は電波源(2)からサーキュレータ(3)を介して
注入される注入波(7)と、ア・ンテナ(4)を介して
得られる受信波(6)とを入力としてこの両者の周波数
混合によって送信波と受信波との差周波数を周波数成分
とするドツプラー信号(9)を得る混合検波器、(10
)はドツプラー信号(9)の信号の振幅を増幅する増幅
器、 (11)は増幅器(1o)によって増幅されたド
ツプラー信号の周波数を計測することに゛よって車両の
速度に換算する計数回路である□また。サーキュレータ
(3)は端子(31)から入る電波は端子(32)へ、
端子(32)から入る電波は端子(33)へ導かれるよ
うになっているが、端子(31)からの電波の一部は端
子(33)にも出力されるようになりている。なお2通
常、電波源(2)、サーキュレータ(3)、アンテナ(
4)及び混合検波器(8)は送受信部(20)と総称す
る。FIG. 2 is a block diagram of a conventional speed measuring device that measures the speed of a vehicle running on a road. In FIG. 9, (1) is a vehicle to be measured, and (2) is a gun (c
(3) a radio wave source composed of an oscillator, etc.
is a circulator, (4) emits radio waves from the radio wave source (2) as a transmission wave (5) toward the vehicle (1), and
An antenna that receives reflected waves (6) from the vehicle (1), (
8) inputs the injected wave (7) injected from the radio wave source (2) via the circulator (3) and the received wave (6) obtained via the antenna (4), and calculates the frequency of both. A mixing detector (10) which obtains a Doppler signal (9) whose frequency component is the difference frequency between the transmitted wave and the received wave by mixing;
) is an amplifier that amplifies the amplitude of the Doppler signal (9), and (11) is a counting circuit that measures the frequency of the Doppler signal amplified by the amplifier (1o) and converts it into the vehicle speed □ Also. The circulator (3) transmits the radio waves that enter from the terminal (31) to the terminal (32).
The radio waves entering from the terminal (32) are guided to the terminal (33), but some of the radio waves from the terminal (31) are also output to the terminal (33). Note 2: Usually, a radio wave source (2), a circulator (3), an antenna (
4) and the mixed detector (8) are collectively referred to as a transmitting/receiving section (20).
従来の速度測定装置はこのように構成され、車両(1)
に当たった送信波(5)は反射して反射波(6)となっ
てアンテナ(4)→サーキュレータ(3)の経路をたど
って混合検波器(8)に入力される。混合検波器(8)
では反射波(6)と注入波(7)との周波数混合によっ
てドツプラー信号(9)が取り出される。The conventional speed measuring device is configured as described above, and the vehicle (1)
The transmitted wave (5) that has hit is reflected and becomes a reflected wave (6), which follows the route from the antenna (4) to the circulator (3) and is input to the mixed detector (8). Mixed detector (8)
Then, a Doppler signal (9) is extracted by frequency mixing of the reflected wave (6) and the injection wave (7).
この時、ドツプラー効果によれば車両(1)の速度V□
とドツプラー信号(9)の周波数fdとの間には式(1
)が成立する。At this time, according to the Doppler effect, there is a relationship between the speed V□ of the vehicle (1) and the frequency fd of the Doppler signal (9) using the equation (1)
) holds true.
V = Cxfd/(2xfo) −−−(1)
ここで、roは送信波(5)の周波数
Cは電波の伝ばん速度
計数回路(11)では増幅器(1o)で増幅されたドツ
プラー信号(9)の周波数を計数して式(1)に従って
車両(1)の速度を測定する。V = Cxfd/(2xfo) ---(1)
Here, ro is the frequency C of the transmitted wave (5), which is calculated by counting the frequency of the Doppler signal (9) amplified by the amplifier (1o) in the radio wave propagation speed counting circuit (11) and driving the vehicle according to equation (1). (1) Measure the speed.
通常、この種の速度測定装置は、車両に搭載して運搬し
、測定現場で構成品を車両から降ろして使用する。この
時、送受信部(20)は道路脇などで三脚上に設置され
、ケーブルなどで構成品間を接続して使用する。Normally, this type of speed measuring device is mounted on a vehicle and transported, and the components are removed from the vehicle and used at the measurement site. At this time, the transmitting/receiving section (20) is installed on a tripod at the side of the road, etc., and the components are connected using cables or the like.
しかし、三脚などを使用して設置する場合には各構成部
間のケーブル接続などに手間が掛かることも事実であり
、特に測定場所を順次移動する場合、速度測定装置の車
両への運搬、測定現場での設置をその都度実施しなけれ
ばならないという問題があった。However, when installing using a tripod, etc., it is a fact that it takes time to connect cables between each component, and especially when moving from one measurement location to another, it is difficult to transport the speed measurement device to the vehicle and take measurements. There was a problem in that on-site installation had to be carried out each time.
この発明はかかる課題を解決するためになされたもので
あり、速度測定装置を搭載する車両の車軸回転を搭載車
両のトランスミッションなどから回転検出器によって検
出し、搭載車両が移動した場合には、速度測定を中1F
、するようにし、搭載車両が速度測定に影響のない程度
の移動がどうかを判定し、影響の無い場合にのみ速度測
定できるようにすることによって機動性に富んだ速度測
定装置を実現するものである。This invention was made in order to solve this problem, and the rotation of the axle of a vehicle equipped with a speed measurement device is detected by a rotation detector from the transmission of the vehicle equipped with it, and when the vehicle equipped with it moves, the speed is detected. Measurement inside 1F
This system realizes a highly maneuverable speed measuring device by determining whether or not the vehicle on which it is mounted is moving to an extent that does not affect speed measurement, and by making it possible to measure speed only when there is no impact. be.
この発明に係る速度測定装置には、速度測定装置を搭載
する車両のトランスミッションに回転検出器を結合し、
この回転検出器の出力を計数回路のリセット信号として
用いるようにしたものである。The speed measuring device according to the present invention includes a rotation detector coupled to a transmission of a vehicle equipped with the speed measuring device,
The output of this rotation detector is used as a reset signal for the counting circuit.
この発明においては2回転検出器からの出力信号により
搭載車両の移動を検出し、−1−記移動速度が予め定め
ておいた値を超過する場合には、リセット信号を出力し
速度測定を停止ヒし、I−記搭載車両が停車もしくは予
め定めておいた値以下の時の゛み、速度測定を行う。In this invention, the movement of the mounted vehicle is detected by the output signal from the two-rotation detector, and if the moving speed in -1- exceeds a predetermined value, a reset signal is output and speed measurement is stopped. The speed is measured only when the vehicle equipped with I- is stopped or the speed is below a predetermined value.
第1図は、この発明の一実施例のブロック図であり2図
において、 (12)はこの速度測定装置を搭載する車
両のトランスミッション、 (13)は回転検出器、
(14)は回転速度信号、 (15)は比較器、(16
)はリセット信号である。なお2図中(1)〜(11)
及び(20)は第2図の同一符号と同等機能を有する。FIG. 1 is a block diagram of an embodiment of the present invention, and in FIG. 2, (12) is a transmission of a vehicle equipped with this speed measuring device, (13) is a rotation detector,
(14) is the rotation speed signal, (15) is the comparator, (16
) is a reset signal. In addition, (1) to (11) in Figure 2
and (20) have the same functions as the same reference numerals in FIG.
また、アンテナ(4)もしくは、送受信部(20)は搭
載車両(図示せず)のボンネットなどに固定されている
ここで2回転検出器(13)は、トランスミッション(
12)に結合金具(図示せず)などで機械的に結合され
ており、搭載車両が移動した場合トランスミッション(
12)が回転し、同時に回転検出器(13)に回転速度
信号(14)となって出力される。具体的には1回転検
出器(13)はロータリーエンコーダなどで構成され、
トランスミッション(12)の回転は2回転数に比例し
た電気パルス列として回転速度信号(14)が得られる
。即ち、トランスミッション(12)の回転が早い程回
転速度信号(14)としてのパルス列は周波数が高くな
る。In addition, the antenna (4) or the transmitter/receiver (20) is fixed to the hood of the vehicle (not shown) in which it is installed.The two-turn detector (13) is the transmission (
12) with a coupling fitting (not shown), and if the vehicle equipped with it moves, the transmission (
12) rotates, and at the same time, a rotation speed signal (14) is output to the rotation detector (13). Specifically, the one-rotation detector (13) is composed of a rotary encoder, etc.
The rotation speed signal (14) of the transmission (12) is obtained as an electric pulse train proportional to the rotation speed. That is, the faster the transmission (12) rotates, the higher the frequency of the pulse train as the rotation speed signal (14) becomes.
一方、比較器(15)は2回転速度信号(14)のが予
め設定した値よりも超過しているかどうかを判定し、超
過している場合にはりセフ1−信号(16)を出力する
。つまり、トランスミッション(12)の回転速度が予
め定めておいて値を超過する場合には。On the other hand, the comparator (15) determines whether the 2-rotation speed signal (14) exceeds a preset value, and if it does, outputs a high-speed 1- signal (16). That is, if the rotational speed of the transmission (12) exceeds a predetermined value.
搭載車両が規定以」二の速度で移動していると見なし、
リセット信号(16)を発する。リセット信号(+6)
が出力されると計数回路(11)はリセットされ速度測
定を停止する。It is assumed that the vehicle equipped with the vehicle is moving at a speed faster than the specified speed.
A reset signal (16) is issued. Reset signal (+6)
When is output, the counting circuit (11) is reset and stops speed measurement.
以−Hのように構成されているので、車両(1)の速度
を測定中に、搭載車両が移動するとトランスミッション
(12)が回転し1回転検出器(13)に伝□達され回
転速度信号(14)が出力される。比較器(15)では
1回転速度信号(14)と予め設定した値とを比較超過
している場合にはリセット信号(]6)を出力し計数回
路(11)をリセットし速度測定を停止I−させる一方
2超過していない場合には、リセット信号(16)が出
力されないので計数回路(lI)は速U測定を行う。こ
のようにして、送受信部(20)が移動していない時の
み速度測定を行える。勿論、送受信部(20)を車両に
搭載しないで、従来通りニー脚などに固定して使用する
こともできる。Since it is configured as shown in Figure 1-H, when the vehicle on which it is mounted moves while measuring the speed of the vehicle (1), the transmission (12) rotates and the rotational speed signal is transmitted to the one-rotation detector (13). (14) is output. The comparator (15) compares the 1-rotation speed signal (14) with a preset value, and if it exceeds the value, outputs a reset signal (]6), resets the counting circuit (11), and stops speed measurement. - on the other hand, if the value does not exceed 2, the reset signal (16) is not output and the counting circuit (lI) measures the speed U. In this way, speed measurement can be performed only when the transmitting/receiving section (20) is not moving. Of course, the transmitting/receiving section (20) may not be mounted on the vehicle, but may be used by being fixed to the knee leg or the like as usual.
なお、実施例では、比較器(15)からリセット信号を
発するようにしたが、搭載車両が全く停車している時の
み速度測定できるようにする場合には単に回転速度信号
(14)をリセット信号として使用することも可能であ
る。In the embodiment, the reset signal is emitted from the comparator (15), but if the speed can be measured only when the vehicle on which it is installed is completely stopped, the rotational speed signal (14) can be simply used as the reset signal. It is also possible to use it as
この発明は以−ト説明したとおり、速度測定装置の送受
信部(20)あるいはアンテナ(4)が所定の範囲内の
移動あるいは、全く停止している時のみ速度測定できる
ようになっているため、送受信部(20)あるいはアン
テナ(4)を車両のボンネットなどに搭載することがで
き2機動性に富む運用が実現できる。As explained above, this invention allows speed measurement only when the transmitting/receiving section (20) or the antenna (4) of the speed measuring device is moving within a predetermined range or is completely stopped. The transmitting/receiving unit (20) or the antenna (4) can be mounted on the hood of the vehicle, etc., and highly maneuverable operation can be realized.
第1図はこの発明の一実施例を示す速度測定装置のブロ
ック図、第2図は従来の速度測定装置のブロック図であ
る。
図において、(1)は被測定物体としての車両、(2)
は電波源、(3)はサーキュレータ、(4)はアンテナ
(8)は混合検波器、 (1(1)は増幅器、 (II
)は計数回路(12)はトランスミッション、 (+3
)は回転検出器(15)は比較器、 (20)は送受信
部である。
なお1図中間−符号部は同一・または相当部分を示す。FIG. 1 is a block diagram of a speed measuring device showing an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional speed measuring device. In the figure, (1) is a vehicle as the object to be measured, (2)
is a radio wave source, (3) is a circulator, (4) is an antenna (8) is a mixed detector, (1 (1) is an amplifier, (II
) is the counting circuit (12) is the transmission, (+3
) is a rotation detector (15) is a comparator, and (20) is a transmitting/receiving section. Note that the reference numerals in the middle of Figure 1 indicate the same or equivalent parts.
Claims (1)
として発射し、かつ、上記車両からの反射波を受信する
アンテナと、上記送信波と上記反射波との周波数混合に
よって上記送信波と上記反射波との差周波数を周波数成
分として有するドップラー信号を出力する混合検波器と
、上記ドップラー信号の周波数計数によって上記車両の
速度を算出する計数回路を備えた速度測定装置において
上記速度測定装置を搭載する車両のトランスミッション
に結合され、上記トランスミッションの回転数に比例し
た回転速度信号を得る回転検出器を設け、この回転検出
器の回転速度信号を上記計数回路のリセット信号として
用いたことを特徴とする速度測定装置。A radio wave source, an antenna that emits a transmission wave from the radio wave source to a vehicle as a measured object and receives a reflected wave from the vehicle, and a frequency mixer of the transmission wave and the reflected wave to generate the transmission wave. and the reflected wave and a mixed detector that outputs a Doppler signal having a frequency component as a frequency component, and a counting circuit that calculates the speed of the vehicle by frequency counting of the Doppler signal. A rotation detector is provided which is connected to the transmission of a vehicle equipped with the transmission and obtains a rotation speed signal proportional to the rotation speed of the transmission, and the rotation speed signal of the rotation detector is used as a reset signal for the counting circuit. speed measuring device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1125225A JPH02302899A (en) | 1989-05-18 | 1989-05-18 | Speed measuring instrument |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1125225A JPH02302899A (en) | 1989-05-18 | 1989-05-18 | Speed measuring instrument |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH02302899A true JPH02302899A (en) | 1990-12-14 |
Family
ID=14904933
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1125225A Pending JPH02302899A (en) | 1989-05-18 | 1989-05-18 | Speed measuring instrument |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH02302899A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7656432B2 (en) | 2005-03-30 | 2010-02-02 | Hoya Corporation | Method and apparatus for photographing moving object |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52154400A (en) * | 1976-06-17 | 1977-12-22 | Matsushita Electric Ind Co Ltd | Vehicle monitor apparatus |
JPS6151584A (en) * | 1984-08-21 | 1986-03-14 | Toyota Motor Corp | Operation controller of vehicle circumference monitoring device utilizing ultrasonic wave |
-
1989
- 1989-05-18 JP JP1125225A patent/JPH02302899A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52154400A (en) * | 1976-06-17 | 1977-12-22 | Matsushita Electric Ind Co Ltd | Vehicle monitor apparatus |
JPS6151584A (en) * | 1984-08-21 | 1986-03-14 | Toyota Motor Corp | Operation controller of vehicle circumference monitoring device utilizing ultrasonic wave |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7656432B2 (en) | 2005-03-30 | 2010-02-02 | Hoya Corporation | Method and apparatus for photographing moving object |
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