Performance Analysis of Vector Tracking Algorithms for Weak GPS Signals in High Dynamics

Lashley, Matthew; Bevly, David M.; Hung, John Y.

doi:10.1109/jstsp.2009.2023341

Cited by 166 publications

(109 citation statements)

References 10 publications

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“…3) Analyzing the required delay time. Focusing on [9,10) and [10,11),when the start point of the incoming signal falls into these two sections, the signal can fall into the non-bit-transition section with a delay of only 5 milliseconds and 4 milliseconds respectively, which establishes that these are required.…”

Section: Baseband Signal Processing In Beidoumentioning

confidence: 99%

“…The vector tracking algorithm can improve the performance of the signal tracking by combining the observation information of different signal channel and the feedback information of the navigation solution [11]. In the process of the receiver navigation, the pseudorange measurements are obtained by the propagation delay of the satellite signal, and the propagation delay is related to the transmission time of the signal, the transmission time of the signal t s is assembled on the measurements of ranging code phase.…”

Section: Vector Tracking Mechanism Analysismentioning

confidence: 99%

See 1 more Smart Citation

Acquisition and loop control of ultra-tight INS/BeiDou integration system

Zeng

Meng

Liu

et al. 2016

Optik

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Section: Baseband Signal Processing In Beidoumentioning

confidence: 99%

Section: Vector Tracking Mechanism Analysismentioning

confidence: 99%

Acquisition and loop control of ultra-tight INS/BeiDou integration system

Zeng

Meng

Liu

et al. 2016

Optik

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“…The work by Lashley (2009) uses two VRs with position state and pseudorange state formulations to show that the main performance benefit is information exchange among VR channels. Lashley and Bevly (2007), Lashley et al (2009), and Dardin et al (2013) show the ability of VR to operate in hard environments.…”

Section: Introductionmentioning

confidence: 99%

Vectorized and federated software receivers combining GLONASS and GPS

et al. 2017

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In traditional federated receiver, all the tracking channels work independently, and there is no interaction among them. However, in vectorized receiver, stronger channels aid others in their tracking. Such architecture makes a receiver to be of interest for positioning in urban canyons and harsh environments. On the other hand, the combination of GPS and GLONASS as the only augmented global constellations is utilized to increase the availability of the receivers which is defined as the percentage of the epochs with enough number of tracked satellites for solving the positioning equation. We report about the software implementation of a GPS-combined-GLONASS Vectorized Receiver (GGVR) and performance assessment of this architecture in signal attenuation and blocking incidents. We also compare the GGVR performance with a GPScombined-GLONASS Federated Receiver (GGFR). Experimental tests in different case studies are included. The results show that in the static blocking situation, the GGVR can reacquire the signal immediately after the momentary outage while the GGFR must return to acquisition stage. For two dynamic case studies, one in a suburban road and one in an urban canyon, the position results on the road are the same, but in an urban environment, the GGFR has only 88% availability in contrast to 100% availability of the GGVR.

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“…Since the carrier frequency is generally much higher than the code frequency, the changes of the carrier frequency are more rapid and complex in the high-dynamic condition, which makes the stability control of the carrier loop more difficult than the code loop in the GPS signal loop control [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

The Acceleration Sensitive Coefficient Calibration of the Crystal Oscillator Based on the GPS Carrier Control Principle

Hang

Liu

et al. 2014

China Satellite Navigation Conference (CSNC) 2014 Proceedings: Volume III

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In acceleration and vibration environment, to weaken frequency instability influence of the crystal oscillator on GPS carrier loop and rectify frequency compensation, researchers usually adopt the solution of crystal oscillator frequency acceleration compensation. The vital basis of compensating frequency errors is how to obtain accurately corresponding sensitive parameters of crystal oscillator. In the traditional calibration approach of acceleration sensitivity coefficient, indispensably using precise frequency reference and measurement equipment makes the calibration process expensive and complex, that fails to be widely applied in GPS navigation system. Combined a precise frequency reference of GPS satellites with the carrier tracking loop principle, the paper analyzes the acceleration frequency errors transmission mechanism of crystal oscillator in the carrier tracking loop, and designs an adaptive weighted EKF to handle frequency bias observed values synchronously in multiple tracking loops, which reduces frequency bias estimating noise and separates frequency offset and frequency drift rate, from the receiver's frequency bias observation in the crystal oscillator. And on this basis, acceleration sensitivity coefficients of crystal oscillator calibrate on the super tight combination navigation board by 2g flipping calibration method. The experiments show that the method is able to effectively calibrate acceleration sensitivity coefficients of crystal oscillator, which is the solution base of compensating crystal oscillator acceleration frequency errors on related GPS technology research.

show abstract

Performance Analysis of Vector Tracking Algorithms for Weak GPS Signals in High Dynamics

Cited by 166 publications

References 10 publications

Acquisition and loop control of ultra-tight INS/BeiDou integration system

Acquisition and loop control of ultra-tight INS/BeiDou integration system

Vectorized and federated software receivers combining GLONASS and GPS

The Acceleration Sensitive Coefficient Calibration of the Crystal Oscillator Based on the GPS Carrier Control Principle

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