JPS5497470A - Ultrasonic vehicle speed measuring apparatus - Google Patents
Ultrasonic vehicle speed measuring apparatusInfo
- Publication number
- JPS5497470A JPS5497470A JP462978A JP462978A JPS5497470A JP S5497470 A JPS5497470 A JP S5497470A JP 462978 A JP462978 A JP 462978A JP 462978 A JP462978 A JP 462978A JP S5497470 A JPS5497470 A JP S5497470A
- Authority
- JP
- Japan
- Prior art keywords
- ultrasonic waves
- vehicle speed
- waves
- frequency
- counter
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
- G01S15/50—Systems of measurement, based on relative movement of the target
- G01S15/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
Abstract
PURPOSE:To measure the vehicle speed at high precision without performing abbreviated operation, by detecting the number of Doppler waves by the specified number of reflected ultrasonic waves from continuously emitted ultrasonic waves, and processing through specified timer, coefficient circuit, and other parts. CONSTITUTION:The n-waves of Doppler signals at frequency fd formed by reflected ultrasonic waves by continuously emitted ultrasonic waves at frequency fo from a vehicle are detected in an n-wave continuous detecting circuit 12. Takng the time width n/fd as the gate period, a counter 14 counts the number of clocks at frequency fc from a clock generator 13, and presets in a preset counter 15. On the other hand, this counter 15, taking the time width pulse n/(2fo) outputted from a timer 16 as the gate period, counts the number of clocks. When these count values are processed in a dividing circuit 17 to which is applied constant K=(n fc)/2sfoXC/costheta outputted by a constant generating circuit 18, the vehicle speed V according to formula I is computed without performing abbreviated operation. Hence, the vehicle speed may be measured at high precision. In this explanation, C refers to the propagation speed of ultrasonic wave in the air, and theta means the emission angle of the continuously emitted ultrasonic waves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP462978A JPS6039987B2 (en) | 1978-01-18 | 1978-01-18 | Ultrasonic vehicle speed measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP462978A JPS6039987B2 (en) | 1978-01-18 | 1978-01-18 | Ultrasonic vehicle speed measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5497470A true JPS5497470A (en) | 1979-08-01 |
| JPS6039987B2 JPS6039987B2 (en) | 1985-09-09 |
Family
ID=11589308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP462978A Expired JPS6039987B2 (en) | 1978-01-18 | 1978-01-18 | Ultrasonic vehicle speed measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6039987B2 (en) |
-
1978
- 1978-01-18 JP JP462978A patent/JPS6039987B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6039987B2 (en) | 1985-09-09 |
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