2025 · Q23
Which one among the following is the method employed by GPS to find the location of a target?
General ScienceSpace and satellite technology
- ATrilateration method, which measures lengths of sides of triangle with target location as one of the heads of the triangle
- BDilation method, which measures distance of target location from two already known landmarks
- CMeasurement of the distance of target from the designated geostationary satellite
- DMeasurement of the distance of target from the designated polar satellite
Explanation
GPS receivers compute position by trilateration: they measure the signal travel time (pseudorange) from at least four satellites and intersect the resulting spheres to fix the location. The 'dilation method' is not a positioning technique, and GPS satellites are in medium earth orbit, not geostationary or polar orbits.