卫星精密定轨的三频观测量IF组合法

doi:10.11947/j.AGCS.2020.20190325

测绘学报 ›› 2020, Vol. 49 ›› Issue (10): 1275-1284.doi: 10.11947/j.AGCS.2020.20190325

卫星精密定轨的三频观测量IF组合法

曾添^1,2,3, 隋立芬¹, 阮仁桂^3,4, 贾小林^3,4, 冯来平^3,4

1. 信息工程大学, 河南郑州 450001;
2. 93216部队, 北京 100085;
3. 地理信息工程国家重点实验室, 陕西西安 710054;
4. 西安测绘研究所, 陕西西安 710054

收稿日期:2019-08-15 修回日期:2020-04-12 发布日期:2020-10-31
通讯作者: 隋立芬 E-mail:suilifen@163.com
作者简介:曾添(1992-),男,博士生,研究方向为卫星精密定轨与定位。E-mail:tattian@126.com
基金资助:
国家自然科学基金（41674016；41704035；41874041；41904039）；地理信息工程国家重点实验室基金（SKLGIE2018-M-2-1）

Satellite precise orbit determination with ionospheric-free strategy using triple-frequency observations

ZENG Tian^1,2,3, SUI Lifen¹, RUAN Rengui^3,4, JIA Xiaolin^3,4, FENG Laiping^3,4

1. Information Engineering University, Zhengzhou 450001, China;
2. Troops 93216, Beijing 100085, China;
3. State Key Laboratory of Geo-Information Engineering, Xi'an 710054, China;
4. Xi'an Research Institute of Surveying and Mapping, Xi'an 710054, China

Received:2019-08-15 Revised:2020-04-12 Published:2020-10-31
Supported by:
The National Natural Science Foundation of China (Nos. 41674016;41704035;41874041;41904039);The State Key Laboratory of Geo-Information Engineering (No. SKLGIE2018-M-2-1)

摘要/Abstract

摘要： 随着全球卫星导航系统的发展，GNSS卫星发播多频观测量已成必然趋势。然而，目前IGS分析中心依然使用双频观测量的策略进行轨道、钟差等产品的解算，并没有顾及额外频点观测量对定轨产品带来的效益。本文使用两个双频无电离层组合（IF）作为观测模型，研究第三频点观测量对轨道、钟差及测站位置精度的改善。在观测方程中将卫星端的相位偏差分成时变和时不变分量，通过对两个IF组合的观测方程进行参数重组，推导了与IGS钟差产品基准一致的满秩观测模型。基于超宽巷、宽巷和窄巷双差模糊度构建策略，给出了三频观测量的模糊度固定方法。首先以12颗GPS Block IIF卫星为例，在两种测站布局情况下进行L1/L2 IF双频定轨（S1）、L1/L5 IF双频定轨（S2）、L1/L2和L1/L5两个IF组合的三频定轨（S3）试验。结果表明S3方案最优，测站均匀、不均匀情况下轨道结果S3相较S1分别改善10%以内、10%左右，钟差的RMS略有改善，STD分别改善6.4%、10.0%，而S3相较S2的改善幅度更小，改善百分比基本在5%以内。随后进行了BDS单系统定轨，并使用激光检核轨道，表明三频定轨较B1/B3定轨结果改善显著，但是较B1/B2方案结果改善微弱，可能的原因是天线相位中心误差改正值不准确。

关键词: 精密轨道确定, 三频, 模糊度固定, 无电离层组合

Abstract: As the development of global navigation satellite system (GNSS), GNSS satellites transmitting multi-frequency signals has become a prevailing trend. However, recently the international GNSS service (IGS) analysis centers still use dual-frequency (DF) observations to derive the orbits, clocks and other products. The additional observations from the third frequency are not considered. We use two DF ionospheric-free (IF) combinations as the observation model, the improvements from the third frequency on orbits, clocks and station positions are assessed. In the carrier phase observation model, the satellite-dependent time-invariant and time-variant components are introduced. The two DF IF observation equations are re-parameterized to make the clock parameter aligned to the IGS clock products, and then the full-rank TF observation model is derived. Based on the strategy of building up extra wide lane, wide lane and narrow lane double-differenced ambiguities, the TF ambiguity resolution (AR) method is deduced. First taking 12 GPS Block IIF satellites as example, three precise orbit determination (POD) schemes, the L1/L2 DF IF POD (denoting as S1), the L1/L5 DF IF POD (denoting as S2), the L1/L2 and L1/L5 TF IF POD (denoting as S3), are processed in two station layouts. Results show that the S3 scheme in two station layouts can obtain the optimal precision. The orbit improvements of S3 with respect to S1 in cases of even and uneven distribution are within 10% and about 10%, respectively. The improvement of clocks RMS is slight, while STD is improved by 6.4% and 10.0%. The improved percentages of S3 vs. S2 are about less one times than that of S3 vs. S1, with the improved percentage of about 5%. Then the BDS-only POD test is processed and the orbits are validated by satellite laser ranging residuals. Results show that comparing with B1/B3 POD, the orbit and clock accuracy of TF POD can be improved. However, the improvement of TF POD comparing to B1/B2 POD is slight or even worse. The possible reason is the inaccuracy antenna phase values.

Key words: precise orbit determination, triple-frequency, ambiguity resolution, ionospheric-free combination

中图分类号:

P228

曾添, 隋立芬, 阮仁桂, 贾小林, 冯来平. 卫星精密定轨的三频观测量IF组合法[J]. 测绘学报, 2020, 49(10): 1275-1284.

ZENG Tian, SUI Lifen, RUAN Rengui, JIA Xiaolin, FENG Laiping. Satellite precise orbit determination with ionospheric-free strategy using triple-frequency observations[J]. Acta Geodaetica et Cartographica Sinica, 2020, 49(10): 1275-1284.

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卫星精密定轨的三频观测量IF组合法

Satellite precise orbit determination with ionospheric-free strategy using triple-frequency observations

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