Which statement about GNSS equipment is true?

Which statement about GNSS equipment is true?

• A. Ground-based receivers and antennas collect electronic radio signals from GNSS satellites.
• B. GNSS signals can be collected by a single handheld unit without an antenna.
• C. GNSS data collection can succeed without tracking satellites simultaneously.
• D. Drones can replace ground-based GNSS receivers entirely.

Answer: (A)

GNSS surveying relies on a ground-based receiver paired with an antenna to capture the radio signals broadcast by satellites. The antenna is essential because it converts those faint electromagnetic waves into electrical signals that the receiver can process. Without an antenna, those signals cannot be collected, so the idea of a handheld unit functioning without an antenna isn’t feasible. To determine position, the receiver needs measurements from multiple satellites at the same time (an epoch). Relying on signals from satellites at different times doesn’t provide the simultaneous observations required for a reliable 3D fix with an unknown receiver clock, so the notion of successful data collection without tracking satellites simultaneously isn’t accurate. Drones may carry GNSS receivers, but they don’t replace ground-based GNSS infrastructure or the workflows that depend on stable base-rover relationships and corrections.

GNSS surveying relies on a ground-based receiver paired with an antenna to capture the radio signals broadcast by satellites. The antenna is essential because it converts those faint electromagnetic waves into electrical signals that the receiver can process. Without an antenna, those signals cannot be collected, so the idea of a handheld unit functioning without an antenna isn’t feasible. To determine position, the receiver needs measurements from multiple satellites at the same time (an epoch). Relying on signals from satellites at different times doesn’t provide the simultaneous observations required for a reliable 3D fix with an unknown receiver clock, so the notion of successful data collection without tracking satellites simultaneously isn’t accurate. Drones may carry GNSS receivers, but they don’t replace ground-based GNSS infrastructure or the workflows that depend on stable base-rover relationships and corrections.