JPS6455473U - - Google Patents
Info
- Publication number
- JPS6455473U JPS6455473U JP15063487U JP15063487U JPS6455473U JP S6455473 U JPS6455473 U JP S6455473U JP 15063487 U JP15063487 U JP 15063487U JP 15063487 U JP15063487 U JP 15063487U JP S6455473 U JPS6455473 U JP S6455473U
- Authority
- JP
- Japan
- Prior art keywords
- vehicle
- antenna
- wave
- turned
- switch
- 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
- 238000005259 measurement Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Radar Systems Or Details Thereof (AREA)
Description
第１図はこの考案の一実施例を示す速度測定装
置のブロツク図、第２図は従来の速度測定装置の
ブロツク図である。
図において、１は被測定物体としての車両、２
は電波源、３はサーキユレータ、４はアンテナ、
８は混合検波器、１０は増幅器、１１は計数回路
、１２はマイクロ波スイツチ、１３は測定スイツ
チ、１４は終端器、１５は位置センサーである。
なお、図中同一符号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 this 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, 10 is an amplifier, 11 is a counting circuit, 12 is a microwave switch, 13 is a measurement switch, 14 is a terminator, and 15 is a position sensor.
Note that the same reference numerals in the figures indicate the same or corresponding parts.
Claims (1)
車両に送信波として発射し、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つて上記送信波と上
記反射波との差周波数を周波数成分として有する
ドツプラー信号を出力する混合検波器と、上記ド
ツプラー信号の周波数計数によつて上記車両の速
度を算出する計数回路を備えた速度測定装置にお
いて、上記電波源と上記アンテナとの間に置いた
マイクロ波スイツチと、上記アンテナの前方の予
め定めておいた地点に車両の到来を検出する位置
センサーと、上記マイクロ波スイツチをオン／オ
フする測定スイツチとを備え、上記位置センサー
が車両の到来を検出した時に予め定めた時間幅の
間、上記測定スイツチをオンするようにし、かつ
、上記測定スイツチがオンした時のみに上記マイ
クロ波スイツチによつて電波源からの電波を上記
アンテナから出力するようにしたことを特徴とす
る速度測定装置。 A radio wave source, an antenna that emits radio waves from the radio wave source as a transmission wave to a vehicle as a measured object, and receives a reflected wave from the vehicle, and frequency mixing of the transmission wave and the reflected wave. A speed measuring device comprising: a mixed detector that outputs a Doppler signal having a difference frequency between the transmitted wave and the reflected wave as a frequency component; and a counting circuit that calculates the speed of the vehicle by frequency counting the Doppler signal. , a microwave switch placed between the radio wave source and the antenna, a position sensor for detecting the arrival of a vehicle at a predetermined point in front of the antenna, and turning on/off the microwave switch. a measurement switch, the measurement switch is turned on for a predetermined time period when the position sensor detects the arrival of a vehicle, and the microwave switch is turned on only when the measurement switch is turned on. A speed measuring device characterized in that radio waves from a radio wave source are output from the antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15063487U JPS6455473U (en) | 1987-10-01 | 1987-10-01 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15063487U JPS6455473U (en) | 1987-10-01 | 1987-10-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6455473U true JPS6455473U (en) | 1989-04-05 |
Family
ID=31423952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15063487U Pending JPS6455473U (en) | 1987-10-01 | 1987-10-01 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6455473U (en) |
-
1987
- 1987-10-01 JP JP15063487U patent/JPS6455473U/ja active Pending
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