Evaluation on measurement performance of low-cost GNSS receivers

One type of the low-cost GNSS (Global Navigation Satellite System) receivers with carrier phase measurement was tested and evaluated in this paper. The evaluation contents contain the interior noise level and actual positioning performance. Indicators including ambiguity fixed rate, right fixed ratio, relative positioning accuracy and initialization time were tested on good view condition for ultra-short baseline and short baseline. According to the results, the pseudo range measurement accuracy is about 20cm and the carrier phase measurement accuracy was about 1mm. the positioning results revealed that on good view condition, the relative positioning accuracy for short baseline reached millimeter level, ambiguity fixed ratio was above 97.5% and the initialization time differed for each single system. It was proved that the measuring performance of the low-cost GNSS receivers was comparable to that of the survey-grade receivers and the practical application of the low-cost GNSS receivers was feasible and reliable.