vteq
New Member
Hello,
I'm trying to find a method to measure laser speed as accurate as it is possible. The only thing that comes to my mind is car GPS. Of course, it works and shows speed but the problem is that there might a huge uncertainity in this measurements. It's car GPS so it's calibrated for high speed like >50 km/h. The highest value I get was only 12 km/h (wind speed: 3-4 m/s). Not to mention that average speed isn't higher than 9 km/h. I think that this device show speed more precisely with high speed like >50 rather than with those <10 km/h. What is more, the lag between moving from my real position to seeing it updated on a screen is something like 1s.
The other thing is that there are only 2 significant digits on a display so my uncertainity is at least like +/- 1km/h.
I was looking for something like electronic log. I thought that there might some kind of equipment with a propeller on the one end and display with another end but I realised that it doesn't exist and even if it exist it costs thousand of dollars.
I read some topics about measuring boat speed but in most cases there are only mentioned GPS systems.
I need this measurements to create real and very accurate polar graph of laser speed. I tried to find it also but the only things I got was "there is no official polar graphs for laser".
So finally I am asking you. Is there any possibility to measure boat speed accurate enough to create a polar graph? Are there any devices like windmeters that show speed of a boat? If no, how can I measure it more precisely than with this car GPS.
P.S Sorry for all language mistakes, I try my best but I'm not english native speaker
I'm trying to find a method to measure laser speed as accurate as it is possible. The only thing that comes to my mind is car GPS. Of course, it works and shows speed but the problem is that there might a huge uncertainity in this measurements. It's car GPS so it's calibrated for high speed like >50 km/h. The highest value I get was only 12 km/h (wind speed: 3-4 m/s). Not to mention that average speed isn't higher than 9 km/h. I think that this device show speed more precisely with high speed like >50 rather than with those <10 km/h. What is more, the lag between moving from my real position to seeing it updated on a screen is something like 1s.
The other thing is that there are only 2 significant digits on a display so my uncertainity is at least like +/- 1km/h.
I was looking for something like electronic log. I thought that there might some kind of equipment with a propeller on the one end and display with another end but I realised that it doesn't exist and even if it exist it costs thousand of dollars.
I read some topics about measuring boat speed but in most cases there are only mentioned GPS systems.
I need this measurements to create real and very accurate polar graph of laser speed. I tried to find it also but the only things I got was "there is no official polar graphs for laser".
So finally I am asking you. Is there any possibility to measure boat speed accurate enough to create a polar graph? Are there any devices like windmeters that show speed of a boat? If no, how can I measure it more precisely than with this car GPS.
P.S Sorry for all language mistakes, I try my best but I'm not english native speaker