摘要
军事反恐、远洋或偏远地区等区域由于条件受控或受限,无法快速自建基准站网框架,因此难以获取高精度的全球绝对位置基准。基于此,提出了利用广播星历中获取的开普勒轨道参数和钟差参数,联合伪距和载波观测值,对单站多天观测文件和导航文件进行静态序贯最小二乘解算,使其定位精度收敛,进而为该区域提供一个低成本的绝对位置基准。多天连续试验结果表明:1)在静态环境下,BDS广播星历单天解的平面和高程定位精度分别为30.0cm和20.0cm,若延长观测时长至7天左右,可获得收敛解,其平面和高程方向平均精度分别达到9.5cm和14.3cm;2)用超快速星历代替广播星历,则BDS单天解平面和高程精度分别为24.3cm和37.3cm,与广播星历结果相差不大;3)对比BDS和GPS定位结果发现,BDS与GPS定位精度结果基本相当,GPS/BDS组合可显著提升定位精度和稳定性。
As the anti-terrorism, ocean-going and remote areas are controlled or restricted by conditions, it is impossible to self-build the frame of base station network quickly, making it difficult to obtain high precision global absolute position reference. To solve the problem, Kepler orbital and clock offsets parameters from the broadcast ephemeris are used in this paper, multi-days observation and navigation files are calculated by using pseudo-range and carrier phase observations through sequential least square method, so that the position error can be convergenced, and a low-cost absolute position benchmark can be provided for this area. The multi-days experiments results show that: 1) In static mode, the one-day solution of horizontal and vertical accuracies are 30.0 cm and 20.0 cm by using BDS broadcast ephemeris. If the observation period is extended to about 7 days, the position error can be convergence, and the average accuracies of horizontal and vertical of BDS are 9.5 cm and 14.3 cm respectively. 2) If the ultra-rapid ephemeris is used to replace broadcast ephemeris, the one-day solution accuracies of BDS in horizontal and vertical are 24.3 cm and 37.3 cm respectively. The results between broadcast ephemeris and ultra-rapid ephemeris are almost the same. 3) Comparing BDS and GPS positioning results, the accuracies of BDS and GPS are almost identical. The GPS/BDS combination can significantly improve positioning accuracy and stability.
作者
康艳超
王乐
谢威
黄观文
KANG Yan-chao;WANG Le;XIE Wei;HUANG Guan-wen(College of Geology Engineering and Geomatics,Chang-an University,Xi'an710054,China)
出处
《导航定位与授时》
2020年第2期117-125,共9页
Navigation Positioning and Timing
基金
国家自然科学基金(41774025,41731066)。
关键词
军事领域
低成本
广播星历
序贯最小二乘
绝对位置基准
精度
稳定性
Military areas
Low-cost
Broadcast ephemeris
Sequential least square method
Absolute position benchmark
Accuracy
Stability
