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gdd 直流激电仪是当今世界上最先进的时间域直流激电仪，具有仪器性能稳定、野外重 复观测一致性好，数据质量高等特点。 其发射机稳流精度高，产品安全性好，是所有同类

The OEM7720 is a multi-frequency, dual-antenna receiver that delivers robust heading and positioning along with advanced interference mitigation features. For maximum flexibility, it uses a 555 channel architecture capable of tracking all current and upcoming GNSS constellations.

It has been proven that PPP solutions can reach the same precision as a Global Double-Difference (GDD) GPS solution. Most importantly, the PPP GLO is found to be capable of producing similar precision and accuracy when compared to …

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Like each member of the HiPer family, the Hiper-GGD features a compact, lightweight design but adds the ability to track dual-frequency GPS and Glonass satellites! The HiPer-GGD is the first system of its size with the advanced performance of dual constellation tracking. Hiper-GGD features: GPS + GLONASS Satellites; Compact, lightweight design

The Global Differential GPS (GDGPS) System is a complete, highly accurate, and extremely robust real-time GNSS monitoring and augmentation system.