Positioning Accuracy

Description Demonstration Data

The data used in the examples and available for the demo is choosen to showcase the working of the algorithms under the following conditions:

Scintillation Scenarios:

  • Very weak to weak scintillation
  • Moderate scintillation
  • Strong Scintillation

Region:

  • High Latitude
  • Equatorial Latitude

Timing:

  • Showing results of positioning solution started during a period of scintillation, providing Kalman filter convergence comparison.
  • Showing results of positioning solution where Kalman filter convergence takes place during non scintillation period and scintillation has an impact on the already converged Kalman filter, thus providing postioning impact comparison.

Definition of a period of scintillation:

To compare the accuracy of the  different weighting schemes during scintillation we arbitrary define a 'period of scintillation' using the following steps:

  1. The level of scintillation is classed as per table 1.
  2. Subsequently a time period of scintillation is defined when more than 5% of the observations are affected by either moderate or strong scintillation. A period is extended by 60 minutes to take into account the (re)convergence of the PPP Kalman filter.
Case S4 at L1
σΦ60 at L1
Strong S4 > 0.6
σΦ60 > 0.5
Moderate 0.4 < S4 ≤ 0.6
0.25 < σΦ60 ≤ 0.5
Weak 0.2 < S4 ≤ 0.4
0.1 < σΦ60 ≤ 0.25
Very Weak S4 ≤ 0.2
σΦ60 ≤ 0.1

Table 1: Scintillation levels