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- W2545238925 abstract "Although purely using the GNSS (Global Navigation Satellite System) users cannot obtain the theoretical GDOP minimum unless the GNSS positioning is aided by a certain number of pseudolites, discussing this problem is still meaningful in understanding the issues about the positioning geometry, such as the PDOP minimization. Many literatures have pointed that the GDOP (Geometric Dilution of Precision) minimum in 3-D positioning is the root square of 10/n where n is the total number of GNSS satellites or ground-based beacons with known coordinates. As the case with five known points concerned in this paper, the current knowledge indicates that the GDOP can reach the minimum the root square of 2, but our discussion shows that the GDOP minimum with five known points cannot get the theoretical minimum the root square of 2, although there are infinite positioning configurations with the lowest PDOP. Fortunately, we can find a positioning configuration with the GDOP 1.428 which is very close to the theoretical minimum 1.414. The PDOP can always reach the theoretical minimum the root square of 9/n, and there are infinite solutions for n > 4. However for GDOP minimization, only when n > 5, infinite solutions can be obtained. The configurations with the lowest GDOPs can be given by solving a set of nonlinear algebraic equations." @default.
- W2545238925 created "2016-11-04" @default.
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- W2545238925 date "2017-02-01" @default.
- W2545238925 modified "2023-10-17" @default.
- W2545238925 title "Understanding GDOP minimization in GNSS positioning: Infinite solutions, finite solutions and no solution" @default.
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- W2545238925 doi "https://doi.org/10.1016/j.asr.2016.10.019" @default.
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