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???
01/16/08 15:08
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 		 #149565 - Plane should be fine, then
Responding to: ???'s previous message
Andy Neil said:
Ap Charles said:
The telemetry works from 4-6 Km (sic) ... accuracy level currently discussed is 15 meters ... I need to interrogate only that object which is closest ... roads are 80-100 meter wide at most places

With those kind of requirements over those kinds of distances, any error due to approximating the earth as flat must, surely, be irrelevant?

It seems that you don't even need to know what the actual distance is - just which one is the closest?



Yes , I am also not sure how to do " sin²(alpha)" stuff with 8bitter , do you have any idea.



quote=Andy Neil]
Ap Charles said:
the roads are 80-100 meter wide at most places

That's wide!

British motorways (6 traffic lanes + 2 "hard shoulders") are only about 30m wide...





I was not talking about my country roads but Highway road of the country where the project needs to be worked for. We have roads mostly of order of 120 feet to 200 feet.

Best/
AP




List of 32 messages in thread
TopicAuthorDate
Global positioning algorithm            01/01/70 00:00      
   Global?            01/01/70 00:00      
   Ehm what do you receive?            01/01/70 00:00      
      coordinates            01/01/70 00:00      
         Length/absolute value of a vector ?            01/01/70 00:00      
         How do they know?            01/01/70 00:00      
         An old greek...            01/01/70 00:00      
            What about doppler            01/01/70 00:00      
               not doppler & math            01/01/70 00:00      
                  Haversine formula is it accurate for short distanc            01/01/70 00:00      
               Are you thinking of D-VOR            01/01/70 00:00      
            An old greek... not accurate enough for            01/01/70 00:00      
               Well, you're stating that it's a 2D space.            01/01/70 00:00      
                  Well, you're stating that it's a 2D space.            01/01/70 00:00      
                     So how wide are your roads?!            01/01/70 00:00      
               You said approximate            01/01/70 00:00      
               Some questions            01/01/70 00:00      
                  Answers to Cooper            01/01/70 00:00      
                     Plane should be fine, then            01/01/70 00:00      
                        Plane should be fine, then            01/01/70 00:00      
                           If you have cartesian coordinates ...            01/01/70 00:00      
                           complex math trough LUT            01/01/70 00:00      
                              Fixed point            01/01/70 00:00      
                                 Scaling            01/01/70 00:00      
                     You have wide roads, then!            01/01/70 00:00      
                        That's still wide!            01/01/70 00:00      
                     Much better            01/01/70 00:00      
                         Much better            01/01/70 00:00      
                           Adjusting for latitude            01/01/70 00:00      
                              Thanks            01/01/70 00:00      
                  Not entirely true            01/01/70 00:00      
                     You\'re right            01/01/70 00:00      

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