What type of GNSS resolution can be improved by switching antennas and receivers between two stations?

The improvement of GNSS resolution by switching antennas and receivers between two stations pertains specifically to ambiguity resolution. In GNSS, ambiguity refers to the unknown integer number of wavelengths that the carrier phase measurements represent. When dealing with phase measurements for determining accurate positioning, these ambiguities must be resolved to obtain precise coordinates.

When antennas and receivers are exchanged between two stations, the method helps to mitigate biases that could be present at either station due to local effects or hardware artifacts. By using different setups, the system can achieve better resolution of the ambiguities because the changes allow for a clearer differentiation between the true phase measurements and the noise or multipath effects. This is particularly beneficial in applications requiring high precision, such as in surveying or when high accuracy is needed for navigation.

The other options—pseudorange, contiguity, and uncertainty—do not directly correlate with the specific improvement gained from switching antennas and receivers in terms of resolving ambiguities in carrier phase measurements. Pseudorange relates to the calculated distance based on the time it takes for the signal to travel from the satellites, but it does not address phase ambiguities. Contiguity and uncertainty pertain to spatial and measurement consistency but do not directly improve ambiguity resolution in the context described.