Abstract: With the development of science and technology, measuring tools and measuring methods have also changed, the measurement type GNSS showed a trend of price to reduce and the shrinkage of the whole. On the market at present commercial prices ranging from tens to hundreds of thousands of GNSS measuring system, and ground base station and mobile station due to large size, unconvenient to carry, making commercial GNSS measurement system using the crowd is limited to some measurement professionals, in the mass market popularity in many fields. Because of the increase in demand for high precision positioning, such as unmanned aerial vehicle (uav), machine guidance, precision agriculture today, prompted GNSS to low-cost and high-precision measurement system miniaturization Light-duty development. In this paper, the U-type BLOX NEO-M8P low-cost OEM GNSS receiver, the static under 50 km baseline observation, based on RTKLIB accuracy of test results and analysis showed that low-cost GNSS measurement system can achieve cm-level positioning accuracy, meet the needs of measurement and GIS application tests. It showed that using the low-cost measurement system can reduce the economic cost of measurement tasks, which is a measuring levels of GNSS receiver economical choice.

Key words: low-cost, static measurement, GNSS receiver, RTKLIB, backward difference