Precision gravity gradiometer/AUV system

et al. 2017

Sensors

Simulation tests were accomplished in this paper to evaluate the performance of gravity matching aided navigation (GMAN). Four essential factors were focused in this study to quantitatively evaluate the performance: gravity database (DB) resolution, fitting degree of gravity measurements, number of samples in matching, and gravity changes in the matching area. Marine gravity anomaly DB derived from satellite altimetry was employed. Actual dynamic gravimetry accuracy and operating conditions were referenced to design the simulation parameters. The results verified that the improvement of DB resolution, gravimetry accuracy, number of measurement samples, or gravity changes in the matching area generally led to higher positioning accuracies, while the effects of them were different and interrelated. Moreover, three typical positioning accuracy targets of GMAN were proposed, and the conditions to achieve these targets were concluded based on the analysis of several different system requirements. Finally, various approaches were provided to improve the positioning accuracy of GMAN.

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Section: Introductionmentioning

confidence: 99%

Performance Evaluation and Analysis for Gravity Matching Aided Navigation

et al. 2017

Sensors

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“…However, the navigation errors of INS increase with time during extended AUV missions. One method for correcting such errors without compromising the AUV mission is by use of underwater gravity aided navigation (GAN) [1–13]. Considering the covertness of an AUV, gravimetry is not easily detected and interfered with, unlike GPS, radar, laser and sonar.…”

Section: Introductionmentioning

confidence: 99%

Technology of gravity aided inertial navigation system and its trial in South China Sea

IET Radar, Sonar & Navigation

et al. 2016

“…Gravity-aided navigation is stable and passive and thus is appropriate for covert underwater navigation. In the past few years, gravity/gravity gradient-aided underwater passive navigation systems have been established on AUVs or submarines to limit INS error accumulation (Affleck and Jircitano, 1990; Goldstein and Brett, 1998; Hays, 2002; Jircitano et al, 1990; Moryl et al, 1998; Rice et al, 2000; Rice et al, 2004; Vajda and Zorn, 1998; Wang and Bian, 2008). Gravimeters and gradiometers were adopted to compensate the INS (Jekeli, 2006; Moody and Paik, 2004).…”

Section: Introductionmentioning

confidence: 99%

Research on the Relative Positions-Constrained Pattern Matching Method for Underwater Gravity-Aided Inertial Navigation

et al. 2015

J. Navigation