scholarly journals A MEMS-IMU Assisted BDS Triple-Frequency Ambiguity Resolution Method in Complex Environments

2018 ◽  
Vol 2018 ◽  
pp. 1-13
Author(s):  
Junbing Cheng ◽  
Deng-ao Li ◽  
Jumin Zhao
Keyword(s):  
High Precision ◽  
Ambiguity Resolution ◽  
Noise Level ◽  
Measurement Unit ◽  
Navigation Satellite ◽  
Complex Environments ◽  
Precision Positioning ◽  
Triple Frequency ◽  
Total Noise ◽  
Mems Imu

Emerging technologies such as smart cities and unmanned vehicles all need Global Navigation Satellite Systems (GNSS) to provide high-precision positioning and navigation services. Fast and reliable carrier phase ambiguity resolution (AR) is a prerequisite for high-precision positioning. The poor satellite geometry and severe multipath effect caused by Beidou Navigation Satellite System (BDS) signal occlusion and reflection in complex environments will degrade the AR performance. In this contribution, a fast triple-frequency AR method combining Microelectromechanical System-Inertial Measurement Unit (MEMS-IMU) and BDS is proposed. First, the Extra-Wide Lane (EWL) ambiguity is fixed with the positioning parameters of MEMS-IMU instead of the pseudorange. Then, the phase noise variance of Narrow Lane (NL) observation is obtained from ambiguity-fixed EWL observation to reduce the total noise level of NL observation, and the NL ambiguity can be reliably fixed, and the BDS positioning result is obtained. Finally, the BDS positioning result is used as the posterior measurement of the extended Kalman filter to update the MEMS-IMU positioning parameters to form the coupling loop of MEMS-IMU and BDS. The data of urban road vehicle experiments were collected to verify the feasibility and effectiveness of the proposed algorithm. Results show that MEMS-IMU can speed up AR, and reduction of total noise level can significantly improve the reliability of AR.

scholarly journals Broadband slot stripline antenna for high-precision positioning by signals of global navigational satellite systems

2019 ◽  
Vol 30 ◽  
pp. 05025
Author(s):  
Vladimir Shepov ◽  
Valery Vladimirov ◽  
Alexander Kondratyev ◽  
Vladimir Borisov
Keyword(s):  
High Precision ◽  
Global Navigation Satellite Systems ◽  
Navigation Satellite ◽  
Precision Positioning ◽  
Leaky Wave ◽  
Satellite Systems ◽  
Leaky Wave Antenna ◽  
Wave Antenna ◽  
Global Navigation ◽  
Global Navigation Satellite

We present the results of the development of a new broadband slot stripline leaky wave antenna intended for high-precision positioning by signals of global navigation satellite systems (GNSS) in the following bands: GLONASS L1/L2/L3, GPS L1/L2/L5, GALILEO E5a/E5b/E6/E1, COMPASS B1/B2/B3.

Triple-frequency carrier ambiguity resolution for Beidou navigation satellite system

GPS Solutions ◽  
2013 ◽  
Vol 18 (3) ◽  
pp. 335-344 ◽  
Author(s):  
Weiming Tang ◽  
Chenlong Deng ◽  
Chuang Shi ◽  
Jingnan Liu
Keyword(s):  
Ambiguity Resolution ◽  
Satellite System ◽  
Navigation Satellite ◽  
Beidou Navigation Satellite System ◽  
Triple Frequency

scholarly journals Calibration of BeiDou Triple-Frequency Receiver-Related Pseudorange Biases and Their Application in BDS Precise Positioning and Ambiguity Resolution

Sensors ◽  
2019 ◽  
Vol 19 (16) ◽  
pp. 3500 ◽  
Author(s):  
Fu Zheng ◽  
Xiaopeng Gong ◽  
Yidong Lou ◽  
Shengfeng Gu ◽  
Guifei Jing ◽  
...  
Keyword(s):  
Ambiguity Resolution ◽  
Single Point ◽  
Satellite System ◽  
Single Frequency ◽  
Navigation Satellite ◽  
Dual Frequency ◽  
Precise Positioning ◽  
Triple Frequency ◽  
Wide Lane ◽  
Point Positioning

Global Navigation Satellite System pseudorange biases are of great importance for precise positioning, timing and ionospheric modeling. The existence of BeiDou Navigation Satellite System (BDS) receiver-related pseudorange biases will lead to the loss of precision in the BDS satellite clock, differential code bias estimation, and other precise applications, especially when inhomogeneous receivers are used. In order to improve the performance of BDS precise applications, two ionosphere-free and geometry-free combinations and ionosphere-free pseudorange residuals are proposed to calibrate the raw receiver-related pseudorange biases of BDS on each frequency. Then, the BDS triple-frequency receiver-related pseudorange biases of seven different manufacturers and twelve receiver models are calibrated. Finally, the effects of receiver-related pseudorange bias are analyzed by BDS single-frequency single point positioning (SPP), single- and dual-frequency precise point positioning (PPP), wide-lane uncalibrated phase delay (UPD) estimation, and ambiguity resolution, respectively. The results show that the BDS SPP performance can be significantly improved by correcting the receiver-related pseudorange biases and the accuracy improvement is about 20% on average. Moreover, the accuracy of single- and dual-frequency PPP is improved mainly due to a faster convergence when the receiver-related pseudorange biases are corrected. On the other hand, the consistency of wide-lane UPD among different stations is improved significantly and the standard deviation of wide-lane UPD residuals is decreased from 0.195 to 0.061 cycles. The average success rate of wide-lane ambiguity resolution is improved about 42.10%.

scholarly journals Improved precise positioning with BDS-3 quad-frequency signals

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Bofeng Li ◽  
Zhiteng Zhang ◽  
Weikai Miao ◽  
Guang’e Chen
Keyword(s):  
High Precision ◽  
Satellite System ◽  
Navigation Satellite ◽  
Precision Positioning ◽  
Precise Positioning ◽  
Positioning Errors ◽  
Short Period ◽  
Wide Lane ◽  
Current Constellation ◽  
Global Navigation Satellite

AbstractThe establishment of the BeiDou global navigation satellite system (BDS-3) has been completed, and the current constellation can independently provide positioning service globally. BDS-3 satellites provide quad-frequency signals, which can benefit the ambiguity resolution (AR) and high-precision positioning. This paper discusses the benefits of quad-frequency observations, including the precision gain of multi-frequency high-precision positioning and the sophisticated choice of extra-wide-lane (EWL) or wide-lane (WL) combinations for instantaneous EWL/WL AR. Additionally, the performance of EWL real-time kinematic (ERTK) positioning that only uses EWL/WL combinations is investigated. The results indicate that the horizontal positioning errors of ERTK positioning using ionosphere-free (IF) EWL observations are approximately 0.5 m for the baseline of 27 km and 1 m for the baseline of 300 km. Furthermore, the positioning errors are reduced to the centimetre level if the IF EWL observations are smoothed by narrow-lane observations for a short period.

scholarly journals Dynamic Adaptive Low Power Adjustment Scheme for Single-Frequency GNSS/MEMS-IMU/Odometer Integrated Navigation in the Complex Urban Environment

2021 ◽  
Vol 13 (16) ◽  
pp. 3236
Author(s):  
Peihui Yan ◽  
Jinguang Jiang ◽  
Yanan Tang ◽  
Fangning Zhang ◽  
Dongpeng Xie ◽  
...  
Keyword(s):  
Power Consumption ◽  
Low Power ◽  
Real Time ◽  
High Precision ◽  
Single Frequency ◽  
Low Power Consumption ◽  
Integrated Navigation ◽  
Precision Positioning ◽  
Average Power Consumption ◽  
Mems Imu

Positioning accuracy and power consumption are essential performance indicators of integrated navigation and positioning chips. This paper proposes a single-frequency GNSS/MEMS-IMU/odometer real-time high-precision integrated navigation algorithm with dynamic power adaptive adjustment capability in complex environments. It is implemented in a multi-sensor fusion navigation SiP (system in package) chip. The simplified INS algorithm and the simplified Kalman filter algorithm are adopted to reduce the computation load, and the strategy of adaptively adjusting the data rate and selecting the observation information for measurement update in different scenes and motion modes is combined to realize high-precision positioning and low power consumption in complex scenes. The performance of the algorithm is verified by real-time vehicle experiments in a variety of complex urban environments. The results show that the RMS statistical value of the overall positioning error in the entire road section is 0.312 m, and the overall average power consumption is 141 mW, which meets the requirements of real-time integrated navigation for high-precision positioning and low power consumption. It supports single-frequency GNSS/MEMS-IMU/odometer integrated navigation SiP chip in real-time, high-precision, low-power, and small-volume applications.

scholarly journals Performance of Tightly Coupled Integration of GPS/BDS/MEMS-INS/Odometer for Real-Time High-Precision Vehicle Positioning in Urban Degraded and Denied Environment

2020 ◽  
Vol 2020 ◽  
pp. 1-15 ◽  
Author(s):  
Fei Liu ◽  
Houzeng Han ◽  
Xin Cheng ◽  
Binghao Li
Keyword(s):  
Success Rate ◽  
Real Time ◽  
High Precision ◽  
Ambiguity Resolution ◽  
Satellite System ◽  
Vehicle Navigation ◽  
Navigation Satellite ◽  
Positioning Accuracy ◽  
High Rise ◽  
Tightly Coupled

Global Navigation Satellite System Real-Time Kinematic (GNSS-RTK) technology is widely used in vehicle navigation, but in complex environments such as urban high-rise street, wooded street, overpass, and tunnel, satellite signals are prone to attenuation or even unavailability. It brings great challenges to the continuous high-precision navigation. For this reason, a tightly coupled (TC) integration algorithm for GPS (Global Positioning System)/BDS (BeiDou Navigation Satellite System)/MEMS-INS (Micro-Electro-Mechanical System-Inertial Navigation System)/Odometer (GCIO) is proposed for vehicle navigation in complex urban environments. The accuracy improvement and ambiguity resolution (AR) performance are analysed in this research. First of all, the INS positioning error is constrained by fusion GPS/BDS (GC) and odometer; then, the predicted position information is used to aid GPS/BDS ambiguity resolution. In GNSS-denied environments, the odometer/INS integration is still carried out for continuous navigation. Real-time experiments are carried out in urban degraded and denied environments to validate the performance of the integrated system. In high-rise streets, the ambiguity fixing success rate of GCIO mode is 13.57% higher than that of GC mode. In the wooded street environment, the success rate has increased particularly significantly, by about 55 percent. The positioning accuracy analysis for open environment, high-rise street, wooded street, overpass, and tunnel is conducted. The experimental results show that in the above environment, the order of 0.1 m positioning accuracy can be achieved in the case of satellite outage for 1 minute, which can meet the positioning needs in most scenarios.

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