Results 1 to 10 of about 10,960 (257)

Hybrid Guidance Optimization for Multipulse Glideslope Approach with Bearing-Only Navigation

Aerospace, 2022
This paper proposes a modified glideslope guidance method that optimizes a hybrid multiobjective of bearing-only navigation error and fuel consumption. The traditional glideslope guidance fixes uniform maneuver intervals and the initial approach velocity
Hao Yuan, Dongxu Li, Jie Wang
doaj   +3 more sources

Wavelet-based visual compass. [PDF]

PLoS ONE
For many ant species, successful visual navigation is crucial for the survival of the individual and the colony, meaning these small-brained insects have evolved to be exceptional navigators.
Stefan Meyer, James C Knight, Alexander Dewar, Efstathios Kagioulis, Thomas Nowotny, Paul R Graham, Andrew Philippides   +6 more
doaj   +2 more sources

3D-guided high-degree posterior rotational osteotomy for avascular necrosis in pediatric femoral neck fractures: A three-case study [PDF]

Journal of Children's Orthopaedics
Purpose: Pediatric femoral neck fractures (PFNFs) are rare (≈1% of pediatric fractures), and avascular necrosis (AVN) is a devastating complication without a universally accepted management.
Minoru Watanabe, Satoshi Kagaya, Daichi Kuzushima, Itaru Kachi   +3 more
doaj   +2 more sources

Does applying CPAK classification boundaries using measurements from a surgical navigation system result in different class distributions? A retrospective assessment [PDF]

Journal of Experimental Orthopaedics
Purpose Coronal Plane Alignment of the Knee (CPAK) classification defines knee phenotypes using two factors: arithmetic hip‐knee‐ankle angle (aHKA) and joint line obliquity (JLO) measured via long leg radiographs (LLRs), which can produce errors due to ...
Matthew D. Hickey, Asim Khan, Alexander Tham, Meraj Akhtar, Antony J. Hodgson, Alistair Ewen, Frederic Picard   +6 more
doaj   +2 more sources

Cooperative Navigation Based on Bearing and Range Measurements to Different Vehicles

IFAC-PapersOnLine, 2020
Abstract This paper presents a navigation solution for a vehicle operating in cooperation with two other. The vehicle is assumed to measure bearing to one of the aiding vehicles and range to the other. An observer with globally exponentially stable error dynamics is designed by obtaining an equivalent observable linear time-varying system using an ...
Pedro Batista
exaly   +2 more sources

Autonomous Underwater Vehicle Navigation via Sensors Maximum-Ratio Combining in Absence of Bearing Angle Data

Journal of Marine Science and Engineering, 2023
This paper proposes a maximum-ratio combining sensor fusion scheme for using an extended Kalman filter in the underwater vehicle positioning task by means of communication devices (buoys) providing location information using a slant-range mechanism ...
Vadim Kramar, Aleksey Kabanov, Kirill Dementiev   +2 more
doaj   +3 more sources

3D-printed navigation-guided FNS-CCS fixation reduces complications in young adults with comminuted femoral neck fractures: a retrospective cohort study [PDF]

BMC Musculoskeletal Disorders
Background Young adults with comminuted femoral neck fractures face elevated risks of postoperative shortening and osteonecrosis of the femoral head (ONFH) This study evaluates a novel surgical protocol integrating the Femoral Neck System (FNS) and 3D ...
Ting Fu, Kailong Geng, Li Li, Donglin Fu, Zongsheng Yin   +4 more
doaj   +2 more sources

Bearing-Only Navigation With Field of View Constraints [PDF]

IEEE Control Systems Letters, 2021
This paper addresses the problem of navigation using only relative direction measurements (i.e., relative distances are unknown) under field of view constraints. We present a novel navigation vector field for the bearing-based visual homing problem with respect to static visual landmarks in 2-D and 3-D environments.
Arman Karimian, Roberto Tron
openaire   +2 more sources

Disturbing impact of multiple wind turbines on the indicated DVOR bearing [PDF]

Advances in Radio Science, 2019
Radio navigation aids, like the Doppler Very High Frequency Omnidirectional Radio Range (DVOR), provide their navigation service by specific radiation of electromagnetic waves depending on the direction in space and according to their specific antenna ...
S. Sandmann, H. Garbe
doaj   +1 more source

Analytical expression for uncertainty propagation of aerial cooperative navigation

Aviation, 2021
In this paper, the propagation of uncertainty in a cooperative navigation algorithm (CNA) for a group of flying robots (FRs) is investigated. Each FR is equipped with an inertial measurement unit (IMU) and range-bearing sensors to measure the relative ...
Ali Faghihinia, M. A. Amiri Atashgah, S. M. Mehdi Dehghan   +2 more
doaj   +1 more source