Unlike conventional systems that depend on GPS, our CanSat is equipped with an autonomous localization method, trilateration. This approach allows us to track the position of the can along the X and Y axes using three ground-based antennas, while estimating its altitude with pressure sensors, which have been already tested in the context of our primary mission. It will depend on factors like weather and signal strengt if we can to visualise the CanSat’s position “en direct”!
For that, we intend to use two techniques: RSSI (Received Signal Strength Indicator) and ToF (Time of Flight). RSSI helps us estimate the distance between the CanSat and the antennas using an analysis of signal strength, while ToF helps ensure of results because it measures the time signals uses to reach each antenna. With three antennas, we get two intersection points in 3D, and we use altitude data from the pressure sensor to know the good one. We intend to compare our trilateration results with GPS data to validate our system’s accuracy ( hopefully :))
