What is dual-antenna heading and what baseline do I need?Two antennas on a known baseline give true heading without moving. Heading accuracy improves with longer baseline; 1 m baseline typically gives
2026/10/08 mei
Which module is best for drones / robots / agriculture?Drones / agriculture: multi-band RTK module (u-blox F9-class or UM98x-class) with small form factor.Robots / AGV: add IMU fusion for dead reckoni
2026/10/08 mei
Q3. What does a GNSS module output?A GNSS module outputs position, velocity and time — your PVT solution — typically as latitude, longitude, altitude, speed and a synchronized clock signal (PPS). It a
2026/10/08 mei
Can a GNSS module work indoors?No — satellite signals are too weak to pass roofs/walls. Indoors use LiDAR, visual SLAM, UWB or magnetic markers; GNSS is for open-sky or semi-open environments.
2026/10/08 mei
Why is my position drifting in cities?Tall buildings cause multipath (signal bounces) and block sky view — the "urban canyon." Fix: dual-band (L1+L5) multi-constellation, a better antenna, a
2026/10/08 mei
How accurate is a GNSS module in numbers?Single point ~1.5–5 m; RTK Fixed ~1 cm + 1 ppm; RTK Float ~10–40 cm; PPP after convergence few cm–dm; dual-antenna heading ~0.1°–0.3° at 1 m baseline.
2026/10/08 mei
What is the difference between RTK, PPP and PPK?RTK: real-time corrections from a nearby base/CORS → centimeter in seconds.PPP: global correction products, no local base, slower convergence, decimeter
2026/10/08 mei
Why can't my RTK module get a fixed solution?Most common causes: antenna not sky-view; signal strength below ~35–40 dB-Hz; RTCM messages/mask mismatch with the firmware; base station coordinates w
2026/10/08 mei
