GPS accuracy is influenced by which of the following residual bias factors ?
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Answer: D. All the above
Explanation
GPS accuracy is degraded by residual satellite orbit uncertainties and clock drifts. Signal propagation delays through the ionosphere and troposphere add ranging errors. Combining all these residual bias factors limits standard single-receiver positioning precision. Satellite ephemeris errors introduce slight position discrepancies in calculated ranges. Atmospheric free electrons delay GPS radio waves passing through the ionosphere. Tropospheric water vapor bends and slows signals traveling down to surface receivers.
High-precision geodetic surveys require dual-frequency receivers to model ionospheric delays. Navigation software applies mathematical tropospheric models to improve user position accuracy. Real-time kinematic systems broadcast corrections to eliminate these residual propagation biases. Satellite-dependent orbital biases represent only one source of overall system error. Receiver clock instabilities alone do not account for atmospheric propagation delays. Atmospheric signal biases are just one component alongside orbital and clock errors.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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