BeiDou Four-Satellite Positioning

During operation, the receiver captures telemetry data from four BeiDou satellites. Through processing this data, the receiver calculates its precise coordinates. These coordinates are typically represented numerically, but raw numbers lack intuitive meaning. To enhance interpretability and practical application, we convert these coordinates into latitude and longitude - a standardized system for describing Earth's surface positions. This conversion enables clearer visualization of the receiver's geographical location and facilitates better decision-making in real-world applications.

From a technical implementation perspective, the positioning algorithm involves solving a system of equations using pseudorange measurements from each satellite. Key functions in the processing pipeline include: - Signal demodulation and navigation data extraction - Satellite position calculation using ephemeris parameters - Geometric dilution of precision (GDOP) evaluation - Least squares estimation for coordinate determination - Coordinate transformation from Earth-Centered Earth-Fixed (ECEF) to geodetic coordinates (latitude, longitude, altitude) The conversion typically employs mathematical models like the World Geodetic System 1984 (WGS84) reference ellipsoid for accurate geodetic coordinate computation.