What does the term 'ephemeris' refer to in GPS technology?

The term 'ephemeris' in GPS technology specifically refers to the data that details the orbits of GPS satellites. This information is essential for determining the precise location of a satellite at any given time, which is crucial for accurately calculating a user's position on Earth. The ephemeris provides the necessary parameters that allow GPS receivers to understand the satellites' movements and positions in relation to the Earth's surface and to the receiver. This data is updated regularly to account for factors such as gravitational influences and atmospheric conditions, ensuring that the GPS system remains accurate and reliable for users. By having access to this orbital information, GPS technology can effectively triangulate and provide the user's location based on signals received from multiple satellites.