How one can say that GPS Position is Good/Bad during rum-time without visualizing on Map ?

Discussion in 'GPS Technical Discussion' started by Ashes, Oct 21, 2017.

  1. Ashes


    Feb 3, 2017
    Likes Received:
    Hello Everyone ,

    I am working on development of Automotive Dead Reckoning (ADR)

    I am using low cost GPS Receiver + Vehicle Motion Data ---> as inputs to the ADR System. The System has got the Vehicle Model , Adaptive Filters which does estimates the Lat-Longs based on previous state.

    The Flag which drives the ADR System Filters , we call it as a confidence flag ... The confidence flag is a function of {No of Satellites Used , Positional Accuracy , Running Standard Deviation , HDOP , VDOP ,CEP} --all from GPS NMEA Data and the Distance between the Vehicle Dynamics Prediction outputs and GPS outputs..
    This confidence flag helps me in switching between GPS Lat-Longs and Predicted Lat-Longs.

    Does anyone suggest any other parameters through which I can know if the Lat-Longs coming via GPS Receiver are bad ???

    To the point , How can anyone say if the GPS Positions outputted by the receiver are good /bad ?? What can be the parameters in Run-time that Once can say its a BAD GPS Postions and I cannot Trust it anymore.
    As far as I know , if its going through a tunnel or in a bad weather or in Downtowns (urban cnayons) , it loses accuracy and starts giving wrong positions
    I am open for a discussion on personal email too . :D :D
    let me know if you have questions.
    Ashes, Oct 21, 2017
  2. Ashes

    Nuvi-Nebie Moderator

    Aug 16, 2015
    Likes Received:
    If your confidence flag using HDOP etc. is not accurate enought, I think you need external data from DGPS or an inherently more accurate GPS using say L1 + L2/L5
    Nuvi-Nebie, Oct 22, 2017
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