source:Industry News release time:2022-07-26 Hits: Popular:realtime gps tracker online
Geodetic receivers are mainly used for precision geodetic surveys and precision engineering surveys. This type of instrument mainly uses carrier phase observations for relative positioning, and has high positioning accuracy. The structure of the instrument is complicated and the price is more expensive. According to the use and accuracy, it is divided into static (single-frequency) receivers and dynamic (dual-frequency) receivers, namely RTK.
At present, in terms of GPS technology development and practical application, internationally well-known manufacturers include Trimble (Trimble) Navigation Company in the United States, Leica Geosystems (Leica Geosystems in Switzerland), TOPCON (Topcon) in Japan, and Magellan in the United States. The company (formerly Thales Navigation), and domestic companies include Shanghai China Testing Navigation, Zhonghai Da, etc.
Trimble's geodetic GPS receiver products mainly include R8, R7, R6 and 5800, 5700 and so on. Among them, the 5800 is a 24-channel GPS/WAAS/EGNOS receiver, which combines a dual-frequency GPS receiver, GPS antenna, UHF radio and power supply in a pocket-sized unit with super-tracking technology built-in Trimble Maxwell 4 chip. Even in harsh electromagnetic environments, it can still provide effective tracking of satellites with less than 2.5 watts of power. At the same time, in order to expand the coverage of the operation and reduce the error in an all-round way, the 5800 can work in the way of multiple base stations with the same frequency. In addition, it is fully compatible with Trimble VRS network technology, and its built-in WAAS and EGNOS capabilities provide real-time differential positioning without a base station.
Leica Geosystems (Leica Geosystems) is a world-renowned professional surveying company and a pioneer in fast static and dynamic RTK technology. The receivers in its GPS1200 system include 4 models: GX1230 GG/ATX1230 GG, GX1230/ATX1230, GX1220 and GX1210.
Among them, GX1230 GG/ATX1230 GG is a 72-channel, dual-frequency RTK measurement receiver. The receiver integrates radio, GSM, GPRS and CDMA modules. Sandproof. Dynamic accuracy: horizontal 10mm+1ppm, vertical 20mm+1ppm; static accuracy: horizontal 5mm+0.5ppm, vertical 10mm+0.5ppm. Its RTK distance at 20Hz can reach 30km or even longer, and it can guarantee centimeter-level measurement accuracy. The reliability of the baseline at 30km is 99.99%.
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