In network design, more than how many GNSS receivers are sufficient for the purpose?

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Multiple Choice

In network design, more than how many GNSS receivers are sufficient for the purpose?

Explanation:
Understanding how many GNSS receivers are needed hinges on solvability in three dimensions and the need to account for receiver clock biases. With three receivers you get a triangle of observations that provides enough independent measurements to determine positions in 3D and estimate the receiver-related time biases. Two receivers don’t provide enough information to resolve all unknowns uniquely in 3D, leaving the problem underdetermined. Having more than three adds redundancy and improves robustness, but three is the minimum that makes the network solution viable.

Understanding how many GNSS receivers are needed hinges on solvability in three dimensions and the need to account for receiver clock biases. With three receivers you get a triangle of observations that provides enough independent measurements to determine positions in 3D and estimate the receiver-related time biases. Two receivers don’t provide enough information to resolve all unknowns uniquely in 3D, leaving the problem underdetermined. Having more than three adds redundancy and improves robustness, but three is the minimum that makes the network solution viable.

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