Active antenna, meeting the dual-frequency high-precision GNSS antenna positioning requirements, the antenna uses a dual-feed ceramic plus bridge to ensure a low axial ratio of the antenna, good overlap between the phase center and the geometric center, suitable for high-precision positioning, built-in high-gain low-noise amplifier module, good out-of-band suppression, strong anti-interference ability, main lobe beam width, etc., can work in GPS L1+L2 or L1+L5 bands. Application areas: driving test, driving training, special vehicles, RTK measurement, mapping and high-precision equipment.