JPS56138263A - Sailing speed measuring instrument of ship and the like - Google Patents
Sailing speed measuring instrument of ship and the likeInfo
- Publication number
- JPS56138263A JPS56138263A JP4217780A JP4217780A JPS56138263A JP S56138263 A JPS56138263 A JP S56138263A JP 4217780 A JP4217780 A JP 4217780A JP 4217780 A JP4217780 A JP 4217780A JP S56138263 A JPS56138263 A JP S56138263A
- Authority
- JP
- Japan
- Prior art keywords
- counter
- input
- period
- speed
- computer
- 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
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
- G01S15/60—Velocity or trajectory determination systems; Sense-of-movement determination systems wherein the transmitter and receiver are mounted on the moving object, e.g. for determining ground speed, drift angle, ground track
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Acoustics & Sound (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Measuring Frequencies, Analyzing Spectra (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
PURPOSE:To make it possible to exactly derive an instantaneous sailing speed in a short time, by adopting the count-down system for which two general period counters have been used. CONSTITUTION:A Doppler beat which is received is input to the period counter A, by which the Doppler beat is counted in accordance with a high speed pulse train DELTAgamma whose frequency is enough high. And, in the counter A, whenever overflow occurs in the course of counting one period of the Doppler beat, it is input to the counter A', the number of times of this overflow is measured, and its value N' is input to the computer system B as a digital signal. At the same time, when counting has been finished, the count value (n) of the counter A is input as a digital value of the computer (b). In the system B, the inputs from the counters A, A' are processed, and the speed is calculated and displayed. In this case, a speed calculating time is that which has added a period calculating time and a processing time of the digital computer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4217780A JPS56138263A (en) | 1980-03-31 | 1980-03-31 | Sailing speed measuring instrument of ship and the like |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4217780A JPS56138263A (en) | 1980-03-31 | 1980-03-31 | Sailing speed measuring instrument of ship and the like |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS56138263A true JPS56138263A (en) | 1981-10-28 |
Family
ID=12628696
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4217780A Pending JPS56138263A (en) | 1980-03-31 | 1980-03-31 | Sailing speed measuring instrument of ship and the like |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56138263A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5130476A (en) * | 1974-09-09 | 1976-03-15 | Tokyo Shibaura Electric Co | HANDOTAIUE HANOSEIZOHOHO |
-
1980
- 1980-03-31 JP JP4217780A patent/JPS56138263A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5130476A (en) * | 1974-09-09 | 1976-03-15 | Tokyo Shibaura Electric Co | HANDOTAIUE HANOSEIZOHOHO |
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