低成本GNSS终端中北斗三号多频观测的分析及应用CSCD

低成本消费级GNSS芯片相较于传统测绘级接收机在体积、功耗等方面具有突出优势,在未来无人驾驶、物联网等新兴应用领域具有极大潜力。然而当前低成本GNSS芯片的观测量存在非常严重的噪声和误差,为了改善观测质量,低成本芯片正逐渐从单频向多频过渡。首先调研了目前低成本GNSS接收机对多频信号的支持情况,然后介绍了北斗三号多频观测在电离层延迟和整周模糊度估计等方面的应用。通过对真实数据的采集和分析,针对当前原始观测量存在的诸多问题,提出了具体的预处理方案,并在此基础上开展了信号强度、电离层和模糊度实验。实验结果表明,基于华为Mate 40手机的低成本GNSS方案的北斗三频电离层延迟估计误差的均值为-2.97m,三频整周模糊度估计的成功率达93.8%,相较于单频整周模糊度估计的3.11%成功率有显著提升。

Analysis and Application of Beidou-3 Multi-band Measurements in Low-cost GNSS Terminal

Low-cost consumer-grade GNSS chipset has outstanding advantages in size and power consumption compared with the traditional survey-grade receiver, and has great potential in the future applications such as unmanned driving and IoT. However, the observations of low-cost GNSS chipset suffers from serious noise and error. In order to improve the observation quality, low-cost chipset is gradually changing from single-band to multi-band. This paper firstly investigates the current status of multi-band signals support for low-cost GNSS receivers, and then introduces the application of Beidou-3 multi-band observation in ionospheric delay and integer ambiguity estimation. Through the real data recording and analysis, in order to deal with the different problems existing in the current raw GNSS measurements, we propose a set of preprocessing methods to the raw observations, and on this basis, the experiments on signal strength, ionospheric delay and integer ambiguity are carried out. The experimental results show that the mean error of ionospheric delay estimation based on Beidou-3 triple-band observations of low-cost GNSS solutions in Huawei Mate 40 smartphone is -2.97m, and the success rate of triple-band integer ambiguity estimation is 93.8%, which is significantly higher than the 3.11% success rate of single-band integer ambiguity estimation.