基于双天线联合的GNSS信号抗旋转跟踪算法

Anti-rotation GNSS tracking algorithm based on joint processing of double antennas

信号遮挡是全球导航卫星系统(GNSS)应用于自旋载体定位的主要难点之一。天线的非全向覆盖特性致使基于幅值慢变假设的常规信号跟踪算法失效。该文提出一种基于双天线联合的GNSS信号抗旋转跟踪算法,使被遮挡天线通道能够依据可视天线通道调整参数,以保证信号复现时环路不致失锁。通过联合处理双天线通道观测量,实现数据比特的差分解调。在基于转台模拟旋转环境的实验中,该算法能够完成自旋信号同步,且跟踪性能、数据解调能力、定位精度均优于单天线非连续接收标量跟踪算法,从而显著提升了鲁棒性。

Signal occlusion is one of the main difficulties in the application of the global navigation satellite system(GNSS) to the positioning of spinning objects. Due to the directional antenna, the conventional tracking algorithm based on the assumption of slow amplitude variation is invalid. This paper proposes an anti-rotation GNSS tracking algorithm based on the joint processing of double antennas, which can adjust the parameters of the blocked channel according to the visual one to ensure that the loop will not lose lock when the signal is reproduced. Through the joint processing of measurement from the channels of double antennas, the differential demodulation of data bits is realized. Tests use a turntable to create a spinning environment. This method can complete the synchronization of the spinning signal. Moreover, the tracking performance, data demodulation ability, and positioning accuracy are better than that of the scalar tracking algorithm of a single antenna with discontinuous reception, greatly improving the robustness.