全球定位系统

2017 Vol. 42, No. 5

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The Service Performance Research of WAAS and EGNOS Broadcast Ephemeris Differential Integrity Based on RTCA

MENG Xin, CAO Yueling, LOU Lizhi, MAO Pengyu

2017, 42(5): 1-9. doi: doi:10.13442/j.gnss.1008-9268.2017.05.001

[Abstract](442) [PDF 1780KB](88)

Abstract:
To improve the service performance of GPS, many countries and regions have established independent GPS Satellite -Based Augment System(SBAS), providing the broadcast ephemeris differential integrity message to satisfy the high precision and the high integrity users’ needs. This paper introduced the message format of the broadcast ephemeris differential integrity message of SBAS such as WAAS and EGNOS, and analyzed the real broadcast ephemeris differential integrity message of SBAS. The long-time corrections and the fast corrections’change characteristic of the broadcast ephemeris are analyzed in different regions which have the different SBAS and different message processing modes. Based on the GPS data provided by the International GNSS Service (IGS), the algorithm of using the broadcast ephemeris differential integrity message of SBAS are studied, and the positioning accuracy and integrity service of WAAS and EGNOS are compared and analyzed. The result shows that the positioning accuracy of WAAS is about 1.2 m, and the positioning accuracy of EGNOS is about 1.8 m. Compared with GPS basic navigation service, the positioning accuracy of WAAS and EGNOS could be increased by about 22％ and 16％. The integrity protection limits calculated by WAAS and EGNOS are roughly equal, within 16 m, and the positioning error can be enveloped.

Research on Orbit Accuracy Evaluation Methods for LEO Satellite Precision Orbit Determination

YUAN Junjun, MENG Ruizu

2017, 42(5): 10-15. doi: doi:10.13442/j.gnss.1008-9268.2017.05.002

[Abstract](524) [PDF 1147KB](138)

Abstract:
Centimeter precision satellite orbit is a prerequisite for completing the science, commercial and other tasks undertaken by LEO satellites, in which post-fit orbit accuracy assessment is one important part of the task. According to observation conditions and carried equipments, selectingappropriate accuracy assessment methods is helpful to evaluate the orbit determination result objectively and accurately. This paper takes GRACE for example, discusses the accuracy of internal and external assessment methods, and gets useful conclusions for the follow-up to China's domestic satellite precision orbit mission.

Comparison and Analysis of Star Image Matching Method Based on Star Sensor

KONG Lingshu, CHEN Meng, ZHANG Fugang

2017, 42(5): 16-20. doi: 10.13442/j.gnss.1008-9268.2017.05.003

[Abstract](396) [PDF 1197KB](58)

Abstract:
With the improvement of attitude measurement accuracy requirement of Surveying and mapping satellite and deep space exploration satellite, it is one of the important issues to further improve the accuracy of star map matching. Star extraction and positioning is a prerequisite for star pattern recognition. This paper briefly discusses the new top hat transformation method of star extraction. By comparing the experimental analysis of the triangle star pattern matching algorithm and the vector P star map matching algorithm advantages and disadvantages.

The Analysis on the Best Noise Model Change of the Component Direction of IGS Reference Station Coordinate Time Series in Europe

YANG Dengke

2017, 42(5): 21-24. doi: 10.13442/j.gnss.1008-9268.2017.05.004

[Abstract](376) [PDF 1097KB](63)

Abstract:
According to the fact that there is on enough research on the comparison of noise characteristics among different components, this paper focusing on the coordinate time series of 58 reference stations in Europe for 11 years, noise analysis has been implemented using different noise model combination and the noise characteristics of each component direction are compared. From these analysis, the noise characteristics in the NEU component of each station is variable, so it is necessary to treat each component differently when analysing the physical interpretation of time series variation characteristics; the coloured noise and amplitude of the vertical component are obviously larger than the horizontal direction, which is consistent with the generally considered the accuracy of the vertical component lower than the horizontal component.

Research on Resistance Coordinate Transformation Method of High Accuracy Based on IGGIII Model

ZHANG Yang, ZHANG Zhigang, QIAN Dong, HUANG Yansong, YU Longhao

2017, 42(5): 25-28. doi: doi:10.13442/j.gnss.1008-9268.2017.05.005

[Abstract](339) [PDF 758KB](126)

Abstract:
A high precision spatial coordinate transformation method based on the robust robustness estimation theory is proposed to avoid the influence of the coordinates of the common point coordinates or the error is too large to solve the coordinate transformation parameters. The method uses IGGIII model redefines the common point with low accuracy or large error, and gradually reduces its role in solving the coordinate transformation parameters, and obtains the reliable coordinate transformation parameters. Finally, the algorithm is used to calculate the common point coordinate data in a project instance. The comparison between the two schemes shows that the proposed method is practical and effective, and can achieve the goal of high precision coordinate transformation. In the actual measurement production has a certain value to promote.

A New Strategy for WiFi Indoor Location Based on Location Fusion

WANG Huaqiang, LU Jing, ZHANG Haitao

2017, 42(5): 29-32. doi: 10.13442/j.gnss.1008-9268.2017.05.006

[Abstract](325) [PDF 815KB](123)

Abstract:
WiFi indoor location technology based on RSS (Received Signal Strength) has become a research hotspot in recent years due to its low cost and easy deployment. WiFi indoor location based on RSS due to indoor environment is complex, dynamic characteristics, position estimation accuracy and reliability is low, so this paper proposes a new fusion positioning strategy to further improve the position of the WiFi indoor positioning precision based on RSS. Three kinds of AP fusion strategy selection strategy position estimation results to estimate the new position, the test results show that the new proposed position fusion positioning strategy can improve the accuracy of position estimation, reliability and guarantee the positioning results, and the overall performance is better.

An Influence Analysis of High-order Ionosphere on GPS Precise Point Positioning

QIN Shanlan, WANG Wenping, ZHUANG Wenquan

2017, 42(5): 33-38. doi: 10.13442/j.gnss.1008-9268.2017.05.007

[Abstract](531) [PDF 2461KB](98)

Abstract:
With the continuous refinement of GPS satellite orbit, clock error and various error correction models, carrying out the study on the highorder ionospheric error correction of static Precision Point Position (PPP), which has an important reference value for improving the processing strategy of PPP observations. The influence degree of highorder ionospheric error on the accuracy of GPS observations and static PPP is analyzed and compared, using the observations from 5 IGS tracking stations, during January 7-9, 2013. The results show that: 1) the influence of the second-order and the third-order of the ionospheric error on the accuracy of GPS observation are cm level and mm level, respectively; 2) the influence of the high-order ionospheric error on the accuracy of GPS PPP is more than 3 mm in low latitude. But the influence degree on the accuracy of the observations and PPP in middle and high latitudes is much smaller than that in low latitudes.

The Analysis of Multi-Node Deceptive Interference Detection Algorithm Based on Location Coordinate

YAO Lihao, SHEN Jiemin

2017, 42(5): 39-42. doi: 10.13442/j.gnss.1008-9268.2017.05.008

[Abstract](319) [PDF 884KB](64)

Abstract:
Because of its small power and high concealment, deception spoofing is becoming an important means to interfere with satellite navigation signals.By using the multi-node deception spoofing detection based on positioning location that is commonly used in model and through the Neyman-pearson method, this article deduced a multi-node deception spoofing detection algorithm based on location coordinates. This algorithm can obtain the expressions of threshold measurements and detection probability in different deception conditions, which can provide the theory basis for multi-node field detecting deception.

A Algorithm of Space Frequency Joint Adaptive Nulling Based on SYSTOLIC Array

LIU Fengshou, GUO Baowen

2017, 42(5): 43-48. doi: 10.13442/j.gnss.1008-9268.2017.05.009

[Abstract](435) [PDF 1646KB](74)

Abstract:
In the research field of adaptive nulling antenna for satellite navigation, it can be divided into super high degree of freedom algorithm, direction and robust adaptive calculation direction. The representative of the super high degree of freedom algorithm is space frequency adaptive processing (SFAP). SFAP greatly increases the freedom of adaptive computing, and can improve the system of interference suppression when the channel is mismatched. The representative of robust adaptive computation is the QR-RLS algorithm, because the QR-RLS algorithm belongs to the data domain algorithm, so it has a good adaptability to the deterioration of the condition of the autocorrelation matrix. Combining the advantages of the two algorithms, a SYSTOLIC-SFAP algorithm is given. In the SFAP framework, the SYSTOLIC array is used to complete the QR-RLS adaptive computation, which is insensitive to channel mismatch and has good convergence performance.

Impact Analysis of Long-distance Real-time Dynamic Differential ]Positioning Based on Ephemeris Type

GUO Min

2017, 42(5): 49-52. doi: 10.13442/j.gnss.1008-9268.2017.05.010

[Abstract](315) [PDF 1035KB](99)

Abstract:
The roving station often can’t obtain the fixed solution when it is more than 30 km between the distance of them with distance away from the reference station. To achieve the real-time processing of the real-time dynamic difference over a long distance, the choice of the GAMIT software almost real-time kinematic TRACK processing module, real-time deformation sequence. TRACK module of GAMIT software is almost chosen to process real-time dynamic difference data over a long distance to achieve real-time deformation sequence. Surveying and mapping workers almost all choose IGS to calculate the of coordinates of roving station and improve the precision of coordinates,but time delay of IGS ephemeris is very long (generally 12 hours), the efficiency of time is low. To solve the problem, the authors do experiments that using the rapid ephemeris (IGR) and precise ephemeris afterwards (IGS) are respectively process the data of roving station. The results of experiments are highly. corresponding. Research results show that has very little to do with choosing the type of precise ephemeris which is used the TRACK module of GAMIT software is used to process data accuracy of station-coordinates, zenith delay and clock error etc. The conclusion has important reference value to surveying and mapping workers in the aspect of improving the time-efficiency.

Research Progress and Prospect of PPP／INS Integration System

WANG Haoyuan, SUN Fuping, XIAO Kai

2017, 42(5): 53-58. doi: 10.13442/j.gnss.1008-9268.2017.05.011

[Abstract](1568) [PDF 778KB](561)

Abstract:
With the construction of GNSS multi-system, precise point positioning (PPP) technology is developing in the direction of real-time and ambiguity-fixed solution. The PPP／INS integration system has a wide application prospect in the navigation and surveying field, since the convenience of not laying base station. In this paper, the contributions of GNSS multi-system, PPP ambiguity fixing, INS-aided to the PPP／INS integration system are systematically summarized. And the progresses of filtering method, smoothing algorithm and stochastic model establishment in integration system are generalized. The development trend of the PPP／INS integration system is discussed.

Calibration Method of Airspeed Based on DGPS in Unsteady State

QU Feizhou

2017, 42(5): 59-62. doi: doi:10.13442/j.gnss.1008-9268.2017.05.012

[Abstract](472) [PDF 795KB](100)

Abstract:
Accurate airspeed and altitude are the basis for flight testing and ensuring flight safety. The latest airworthiness standard for civil transport airplane requires airspeed system should be calibrated in the full envelope of the airplane. The speed of the airplane on the ground roll stage and stall process is rapidly changing, and traditional airspeed calibration method is only applicable for stable state. This paper introduces the principle of DGPS method, using the relationship between DGPS height difference and the pressure height difference, to obtain the results of airspeed system position error under non steady state conditions. And this method has successfully applied on domestic regional airplane flight tests.

ZHNAG Jian, SHAO Chenguang, LI Manqing

2017, 42(5): 63-67. doi: 10.13442/j.gnss.1008-9268.2017.05.013

[Abstract](372) [PDF 1321KB](94)

Abstract:
In the GNSS receiver, it is very common to extract the navigation message caused by bit synchronization errors, such as the failure of the navigation message and the error of the pseudo range. The current bit synchronization algorithm is mainly based on the histogram method. Among them, the histogram method based on hard decision is widely used, mainly because of its convenient implementation, but its low noise ratio is too low, can not meet the needs of the project. Therefore, it is necessary to study the bit synchronization algorithm under low SNR, this scheme adopts the bit synchronization algorithm with the combination of histogram method and software. First, the GNSS signal data is generated at different carrier to noise ratio, and it has 20 bit boundaries. Then, two algorithms are used to carry out bit synchronization. Repeated simulation times, each time the simulation using random bit boundary, get the correct bit synchronization probability of each algorithm in different carrier to noise ratio. The simulation results show that the longer the bit synchronization time is, the greater the probability of the algorithm is. In the low carrier to noise ratio, the soft correlation method is much higher than the traditional histogram method. Then the soft correlation method was implement in altera arriav.

A Cycle Slips Detecting Algorithm for GPS Single Frequency RTK

JIN Xing, WANG Ling, HUANG Wende

2017, 42(5): 68-73. doi: 10.13442/j.gnss.1008-9268.2017.05.014

[Abstract](382) [PDF 1191KB](80)

Abstract:
Aiming at the problem that the traditional code-carrier phase cycle detection method is applied to single frequency RTK, which is not sensitive to small cycle slips and is susceptible to observation noise, the thesis presents a single frequency cycle slip detection method with Doppler observations supporting. And this method combines two consecutive epochal Doppler observations with carrier phase difference observations to construct a Doppler-carrier phase difference sequence for real-time cycle slip detection. Then the hypothesis-test method is applied to detect whether there is a cycle slip in the single frequency carrier phase observations. Finally, the measured data shows that the method proposed in the thesis can accurately detect the small cycle slips in the single frequency carrier phase observation data, and the detection sensitivity of the method is higher than that of the traditional code-phase difference sequence method, which is suitable for single frequency RTK positioning technology.

Design and Realization of the Position and Communication System Based on BDS for Full Ocean Depth Equipment

CHEN Zhong, GUO Wei, ZHOU Yue, WANG Biao

2017, 42(5): 74-79. doi: 10.13442/j.gnss.1008-9268.2017.05.015

[Abstract](219) [PDF 3249KB](82)

Abstract:
Based on the dual-mode working pattern of BeiDou satellites, a position and communication system is designed to transmit the geographic location of full ocean depth marine equipment to the mother ship or control center. This paper adopts the radio navigation satellite system (RNSS) model for positioning and the radio determination satellite service (RDSS) model for sending the location or the transmission information to the receiver’s module. Such system uses photosensitive, angle and temperature sensors combination redundancy working mode to achieve all-weather effective detection for marine equipment operating environment, and then controls the sleep and wake modes of the Beidou module, and the switch between RDSS or RNSS mode by single-chip microcomputer. The experiment results of both location test and sea trials in the Mariana trench show that the system proposed in this paper not only has a high success rate of rapid positioning, but also can effectively save power supply and realize the transmission of short-message communicating.

Navigation and Positioning Technology in Emergency Logistics

LI Yaping, WU Haitao, HOU Hanping

2017, 42(5): 80-84. doi: 10.13442/j.gnss.1008-9268.2017.05.016

[Abstract](279) [PDF 779KB](106)

Abstract:
According to the characteristics of the logistics business under emergency situation and the existing problems, The paper introduced the concept and characteristics of emergency logistics, business process, researched the application of satellite navigation technology in the field of China's national emergency and the logistics industry in large information systems and logistics distribution centers and the emergency rescue scene of the indoor positioning technology, analyzed the challenge of navigation technology in emergency logistics,Combined with the development of positioning, navigation and time (PNT), proposed that the key breakthrough in the future application of emergency logistics is the technology including navigation information’s security and trusted、continuously available and the terminal equipment miniaturization and low powered consumption. the progress of these technologies will promote the field of emergency logistics for navigation and positioning more extensive needs and more in-depth applications.

Using Bernese To Calculate Ground Based GPS Zenith Delay

HAN Xiaodong, WANG Haosen, WANG Jianwen, WANG Shuo, WANG Jie

2017, 42(5): 85-88. doi: 10.13442/j.gnss.1008-9268.2017.05.017

[Abstract](266) [PDF 1020KB](72)

Abstract:
This paper mainly introduces the method of using Bernese software to calculate the zenith delay and how to solve the problems, which is intended to prepare for Ground-based GPS inversion of the applied research of atmospheric precipitation.The delay of zeniths in different regions in the same period was significantly different from that of the four zeniths in the CHAN、TWTF、LHAZ. The total delay of the zenith at different times in the same area was also different.

Exploration of Teaching Reform on Principles of Satellite Navigation

XU Rong, DAI Weiheng, ZHAO Luwen, ZHANG Beijiang

2017, 42(5): 89-92. doi: 10.13442/j.gnss.1008-9268.2017.05.018

[Abstract](242) [PDF 1691KB](101)

Abstract:
Satellite navigation system has been widely used in civilian and military fields, and drives the rapid development of satellite navigation technology. How to cultivate professional and technical talents in the application fields of satellite navigation system has become the urgent requirement of social development. For the change of cultivating mode of military academy talents, how to cultivate satellite navigation talents in military education to meet the requirement for military, also needs to be discussed. Reform measures including teaching contents, teaching methods, and evaluation methods, are proposed in this paper, based on analyzing the curriculum status of Principles of Satellite Navigation for Communication Engineering undergraduate course. According to practical teaching, it is suggested that the curriculum reform has obtained good teaching effect.