| 徐婷佳,鲁昌华,周娜,蒋薇薇.低采样率下北斗三频数据周跳探测与修复[J].电子测量与仪器学报,2017,31(3):402-407 |
| 低采样率下北斗三频数据周跳探测与修复 |
| Beidou triple frequency cycle slips detection and correction under low sampling rate |
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| DOI：10.13382/j.jemi.2017.03.011 |
| 中文关键词: 周跳 无几何 无电离层组合 电离层残差 伪距相位组合 |
| 英文关键词:cycle slip geometry free and ionosphere free combination ionospheric residual code phase combination |
| 基金项目:合肥市北斗卫星导航重大应用示范（发改办高技（2014）2564号）资助项目 |
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| Author | Institution |
| Xu Tingjia | School of Computer and information, Hefei University of Technology, Hefei 230009, China |
| Lu Changhua | School of Computer and information, Hefei University of Technology, Hefei 230009, China |
| Zhou Na | School of Computer and information, Hefei University of Technology, Hefei 230009, China |
| Jiang Weiwei | School of Computer and information, Hefei University of Technology, Hefei 230009, China |
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| 中文摘要: |
| 针对低采样率情况下电离层延时变化量增大，导致常规周跳探测方法无法达到较高精度的问题，提出了一种适用于低采样率的新方法。首先，通过无几何 无电离层载波相位组合和二次历元间差分的电离层残差组合求得周跳发生的历元；然后在该历元处选取两组无电离层伪距相位组合作为周跳第1、第2检测量，一组考虑电离层变化量的无几何组合作为第3检测量，构成3个线性无关的组合，对周跳进行修复；最后通过北斗三频实测数据对算法进行验证。实验表明，该方法对30 s采样间隔下的各种类型的周跳组合仍可以准确修复，且不存在盲点。该方法有效地减弱了采样率减小时，电离层延时变化量增大对周跳探测的影响，可适用于非动态、动态、非差数据的实时修复。 |
| 英文摘要: |
| Aiming at the problem that most conventional methods cannot achieve high precision when ionospheric delay variation increasing at low sampling rate, a new cycle slip detection and correction method is proposed. Firstly, a geometry free and ionosphere free carrier phase combination (GIF), and a second order time difference phase ionospheric residual combination (STPIR) are integrated to detect the cycle slips epochs. Then in these cycle slips epochs, two ionosphere free code phase combinations are selected as the first and the second detectable amount respectively, and a geometry free combination (GF), which ionospheric variation is taken into account, is selected as the third. These three combinations are composed linearly independently to find the values of cycle slips. Finally, the experiment with BeiDou triple frequency is given to verify the method. The experiment indicates that even in 30 s sampling intervals, the method can still detect different types of cycle slip, especially insensitive cycle slips. This method can effectively reduce the effect of increasing ionospheric delay variation at low sampling rate, and be applied to dynamic, un differenced observations. |
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