Results 51 to 60 of about 811 (173)

An Aided Navigation Method Based on Strapdown Gravity Gradiometer

Sensors, 2021
The gravity gradient is the second derivative of gravity potential. A gravity gradiometer can measure the small change of gravity at two points, which contains more abundant navigation and positioning information than gravity.
Duanyang Gao, Baiqing Hu, Lubin Chang, Fangjun Qin, Xu Lyu   +4 more
doaj   +1 more source

Passive Target Motion Analysis With Own‐Ship Location Uncertainty in the Presence of Non‐Gaussian Sensor Noise

IET Radar, Sonar &Navigation, Volume 19, Issue 1, January/December 2025.
This work explores underwater TMA by incorporating time delay and Doppler frequency measurements along with angle data, eliminating the need for own‐ship manoeuvre and improving estimation accuracy in presence of non‐Gaussian sensor noise. Furthermore, since the own‐ship's position is inherently uncertain due to navigation errors, this work addresses ...
Rohit Kumar Singh, Shreya Das, Shovan Bhaumik   +2 more
wiley   +1 more source

Multiframe Target Localization With Strapdown Seeker Based on Self‐Adaptive L‐SHADE

International Journal of Aerospace Engineering, Volume 2025, Issue 1, 2025.
Strapdown seekers are increasingly used in the terminal guidance for the advantages of small size and low cost. However, due to the coupling of the seeker with the missile and its limited field of view, there is a risk of losing the target. This paper proposes a multiframe fusion target localization method for missiles with strapdown seekers, which can
Jiayang Wu, Huabo Yang, Hao Yang, Jiexin Zhou, Shifeng Zhang, Zhang Jiaying   +5 more
wiley   +1 more source

Fault Detection and Isolation for Redundant Inertial Measurement Unit under Quantization

Applied Sciences, 2018
Fault detection and isolation with redundant strapdown inertial measurement unit is critical for ensuring the reliability of the guidance or navigation system in the fields of both aeronautics and astronautics.
Tong Zhang, Fenfen Wang, Wenxing Fu
doaj   +1 more source

SmokeNav: Millimeter‐Wave‐Radar/Inertial Measurement Unit Integrated Positioning and Semantic Mapping in Visually Degraded Environments for First Responders

Advanced Intelligent Systems, Volume 6, Issue 12, December 2024.
In this work, SmokeNav, a system that fuses inertial sensor and millimeter‐wave radar for accurate user localization and metric map reconstruction in visually degraded environments, is presented. Using a foot‐mounted inertial sensor with human motion constraints, SmokeNav leverages inertial positioning to construct occupancy maps from radar data.
Changhao Chen, Zhiqiang Yao, Junlin Jiang, Xianfei Pan, Xiaofeng He, Ze Chen, Bing Wang   +6 more
wiley   +1 more source

Research on a mixed prediction method to vehicle integrated navigation systems

International Journal of Advanced Robotic Systems, 2019
Aiming to improve the positioning accuracy of vehicle integrated navigation system (strapdown inertial navigation system/Global Positioning System) when Global Positioning System signal is blocked, a mixed prediction method combined with radial basis ...
Di Zhao, Huaming Qian, Dingjie Xu
doaj   +1 more source

Initial Alignment Algorithm Based on the DMCS Method in Single-Axis RSINS with Large Azimuth Misalignment Angles for Submarines

Sensors, 2018
Since the inertial sensor error has been modulated effectively by the Rotation Modulation Technique (RMT), the Rotation Strapdown Inertial Navigation System (RSINS) has been widely used for submarines in order to satisfy the requirement of high-accuracy ...
Xiu-Wei Xia, Qian Sun
doaj   +1 more source

Robust adaptive non‐linear alignment algorithm for SINS/DVL integrated navigation system based on variational Bayesian

IET Science, Measurement &Technology, Volume 18, Issue 9, Page 524-539, November 2024.
The proposed algorithm VBRAUKF is useful for dynamic alignment of SINS/DVL. According to the inaccurate modelling of the observation model, an adaptive estimation strategy for the measurement noise covariance is designed by Variational Bayesian algorithm based on unscented Kalman filter algorithm to solve dynamic attitude alignment for SINS/DVL ...
Bing Zhu, Jingshu Li, Guoheng Cui, Zuohu Li, Ge Tian, Xia Guo   +5 more
wiley   +1 more source

Data‐driven observability analysis and enhancement for radome slope estimation with constraints on impact angle and terminal acceleration

IET Radar, Sonar &Navigation, Volume 18, Issue 10, Page 1887-1907, October 2024.
The authors propose a data‐driven observability analysis method for radome aberration estimation systems with LOS‐angle‐only measurements, and an observability‐enhanced guidance law that considers both impact angle and terminal acceleration constraints.
Bingyu Jin, Kelin Lu, Yuping Lu
wiley   +1 more source

SHAKF‐PU: Sage–Husa Adaptive Kalman Filtering‐Based Pedestrian Characteristic Parameter Update Mechanism for Enhancing Step Length Estimation in Pedestrian Dead Reckoning

Applied Bionics and Biomechanics, Volume 2024, Issue 1, 2024.
Step length estimation (SLE) is the core process for pedestrian dead reckoning (PDR) for indoor positioning. Original SLE requires accurate estimations of pedestrian characteristic parameter (PCP) by the linear update, which may cause large distance errors.
Chinyang Henry Tseng, Jiunn-Yih Wu, Francesca Cordella   +2 more
wiley   +1 more source