共查询到17条相似文献，搜索用时 125 毫秒
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目前尚无一种GNSS数据质量检测软件可以兼容RINEX格式第二版和第三版、同时兼容四大导航卫星系统,严重滞后于GNSS的发展。基于MATLAB语言研发了一种新的数据质量检测软件BQC,不仅可以处理单观测文件,还可以对多个观测文件进行批处理;可以输出四大导航卫星系统的卫星角度位置、多径误差、电离层延迟、载噪比和周跳等信息及统计报告,在批处理模式下还可对多观测文件的数据质量进行比对;与TEQC相比具有较强的兼容性、算法优越性和直观性。随着四大导航系统的逐步完善和RINEX格式第三版的推广使用,该软件将会为GNSS的建设成果检验工作提供一种有力的支撑工具。 相似文献
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在全球卫星导航系统的研究和测量工作中,需要对GNSS测量数据进行分析和计算,解码GPS接收机原始数据是实时获得以上数据的主要方法。原始电文的二进制格式由各接收机板卡厂商及板卡集成厂家定义本文介绍了常用原始GNSS数据格式内容并对其进行解码转化为标准的RINEX格式文件。该解码软件可以对多种数据格式的电文进行分析解码得到相应的多系统观测文件和星历文件,包括BDS三频数据,并可以根据需要选择生成的RINEX文件中系统类型。使用TEQC软件对数据质量进行进一步的质量分析,为后续的数据分析和处理提供了可靠的保障。 相似文献
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随着我国北斗卫星导航系统的迅速发展,国际海运事业无线电技术委员会RTCM3版本标准格式的应用逐渐增多,网络RTK基准站网观测值存储的管理规范逐渐加强。针对安全保存基准站网RINEX格式观测数据文件的需求,开发软件将各基准站接收机发送的RTCM3实时数据流通过单向光闸存储为文件,同时实时解码RTCM3数据流生成RINEX格式的观测值文件并编码提供数据传输端口,最后通过实测数据验证程序解码编码的正确性。 相似文献
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对以往GPS数据转换软件存在转换效率低、数据质量差等进行了研究,提出在LINUX环境下用CSHELL语言编写的一站式批量转换方法,将原始观测数据t00/t01/t02转换成.tgd格式,再转换成标准的RINEX格式文件。实验结果表明相比常规方法,本文提出的方法转换时间缩短至10%,且P2数据流能得到很好地保留,为后期数据处理提供质量保障。 相似文献
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简述了TEQC检查和分析RINEX格式观测数据的基本原理,结合某D级GPS控制网工程实际,实地设站观测C级GPS起算点并对观测数据进行质量检核,以检查起算点观测环境和站址选择的合理性。 相似文献
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RINEX格式是GPS数据一种常用的标准数据格式,通用性强,利于多种型号的接收机联合作业,绝大多数商用软件都能处理。本文从生产实践出发,详细介绍了RINEX格式数据信息及常用的几种GPS接收机数据传输与转换方式,以及解算过程中出错数据元的检查和修正,对指导生产实践有一定的借鉴意义。 相似文献
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介绍GPS接收机数据的RINEX标准交换格式,讨论二进制数据格式文件向文本文件转换的方法及需要注意的问题,通过分析HemisphereJ、avad、AC12、NavCom 4种不同OEM板二进制数据格式,指出GPS接收机的二进制数据文件向RINEX文件转换的一般方法,并编程实现所有程序,验证方法的正确性。 相似文献
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In this study, the effect of different sampling rates (i.e. observation recording interval) on the Precise Point Positioning (PPP) solutions in terms of accuracy was investigated. For this purpose, a field test was carried out in ?orum province, Turkey, on 11 September 2019. Within this context, a Geodetic Point (GP) was established and precisely coordinated. A static GNSS measurement was occupied on the GP for about 4-hour time at 0.10 second (s)/10 Hz measurement intervals with the Trimble R10 geodetic grade GNSS receiver. The original observation file was converted to RINEX format and then decimated into the different data sampling rates as 0.2 s, 0.5 s, 1 s, 5 s, 10 s, 30 s, 60 s, and 120 s. All these RINEX observation files were submitted to the Canadian Spatial Reference System-Precise Point Positioning (CSRS-PPP) online processing service the day after the data collection date by choosing both static and kinematic processing options. In this way, PPP-derived static coordinates, and the kinematic coordinates of each measurement epoch were calculated. The PPP-derived coordinates obtained from each decimated sampling intervals were compared to known coordinates of the GP for northing, easting, 2D position, and height components. According to the static and kinematic processing results, high data sampling rates did not change the PPP solutions in terms of accuracy when compared to the results obtained using lower sampling rates. The results of this study imply that it was not necessary to collect GNSS data with high-rate intervals for many surveying projects requiring cm-level accuracy. 相似文献
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Currently, the GNSS computing modes are of two classes: network-based data processing and user receiver-based processing. A GNSS reference receiver station essentially contributes raw measurement data in either the RINEX file format or as real-time data streams in the RTCM format. Very little computation is carried out by the reference station. The existing network-based processing modes, regardless of whether they are executed in real-time or post-processed modes, are centralised or sequential. This paper describes a distributed GNSS computing framework that incorporates three GNSS modes: reference station-based, user receiver-based and network-based data processing. Raw data streams from each GNSS reference receiver station are processed in a distributed manner, i.e., either at the station itself or at a hosting data server/processor, to generate station-based solutions, or reference receiver-specific parameters. These may include precise receiver clock, zenith tropospheric delay, differential code biases, ambiguity parameters, ionospheric delays, as well as line-of-sight information such as azimuth and elevation angles. Covariance information for estimated parameters may also be optionally provided. In such a mode the nearby precise point positioning (PPP) or real-time kinematic (RTK) users can directly use the corrections from all or some of the stations for real-time precise positioning via a data server. At the user receiver, PPP and RTK techniques are unified under the same observation models, and the distinction is how the user receiver software deals with corrections from the reference station solutions and the ambiguity estimation in the observation equations. Numerical tests demonstrate good convergence behaviour for differential code bias and ambiguity estimates derived individually with single reference stations. With station-based solutions from three reference stations within distances of 22–103 km the user receiver positioning results, with various schemes, show an accuracy improvement of the proposed station-augmented PPP and ambiguity-fixed PPP solutions with respect to the standard float PPP solutions without station augmentation and ambiguity resolutions. Overall, the proposed reference station-based GNSS computing mode can support PPP and RTK positioning services as a simpler alternative to the existing network-based RTK or regionally augmented PPP systems. 相似文献
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RINEX_HO: second- and third-order ionospheric corrections for RINEX observation files 总被引：1，自引：0，他引：1
When GNSS receivers capable of collecting dual-frequency data are available, it is possible to eliminate the first-order ionospheric
effect in the data processing through the ionosphere-free linear combination. However, the second- and third-order ionospheric
effects still remain. The first-, second- and third-order ionospheric effects are directly proportional to the total electron
content (TEC), although the second- and third-order effects are influenced, respectively, by the geomagnetic field and the
maximum electron density. In recent years, the international scientific community has given more attention to these kinds
of effects and some works have shown that for high precision GNSS positioning these effects have to be taken into consideration.
We present a software tool called RINEX_HO that was developed to correct GPS observables for second- and third-order ionosphere
effects. RINEX_HO requires as input a RINEX observation file, then computes the second- and third-order ionospheric effects,
and applies the corrections to the original GPS observables, creating a corrected RINEX file. The mathematical models implemented
to compute these effects are presented, as well as the transformations involving the earth’s magnetic field. The use of TEC
from global ionospheric maps and TEC calculated from raw pseudorange measurements or pseudoranges smoothed by phase is also
investigated. 相似文献
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分析了天宝、徕卡、南方三种数字水准仪的数据记录格式的特点。基于C#编程语言,开发具备数据格式转换及数据平差处理等功能的软件系统。选择实际工程数据,通过与商用软件计算结果比较,验证了软件的正确性。 相似文献
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TEQC: The Multi-Purpose Toolkit for GPS/GLONASS Data 总被引：31，自引：11，他引：20
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Ram Kumar Giri 《Journal of the Indian Society of Remote Sensing》2012,40(3):389-398
Global Navigation Satellite System (GNSS) is widely used nowadays in variety of applications. The observation file for the near real time estimation of Integrated Precipitable Water Vapour (IPWV) received at the ground-based receiver is mixed with ambiguities. Multi-path effects affect the positional accuracy as well as range from satellite to ground based receiver of the system. The designing of the antenna suppress the effect of multi-path, cycle slips, number of observations, and signal strength and data gaps within the data streams. This paper presents the preliminary data quality control findings of the Patch antenna (LeicaX1202), 3D Choke ring antenna (LeicaAR25 GNSS) and Trimble Zephyr antenna (TRM 39105.00). The results shows that choke ring antenna have least gaps in the data, cycle slips and multi-path effects along with improvement in IPWV. The signal strength and the number of observations are more in case 3D choke ring antenna. 相似文献