Browse Topic: Navigation and guidance systems

Items (917)
The recent discovery of glacier remains in Noctis Labyrinthus, the "Maze of the Night" near Mars' equator sheds new light on the history of water on Mars, the evolution of the planet’s climate and geology, and the possibility of life. It also opens the possibility for massive amounts of clean glacier ice to be accessed by astronauts at low latitudes on Mars, alleviating the need to operate in more frigid higher latitudes. Further reconnaissance of the site requires a robotic vehicle capable of traversing rough, salt-crusted glacier surfaces and leaping across crevasse fields. To address this need, we propose a conceptual hybrid aerial/ground vehicle, LILI (Long-term Ice-field Levitating Investigator). LILI combines episodic rotary-wing flight with ground mobility as a propeller-driven sled through an arrangement of skis/runners, wheels, and tilting proprotors. A high-level look at the Noctis Labyrinthus "relict glacier" site is presented, along with a notional LILI mission traverse concept designed to ensure critical scientific measurements are captured. The NASA Design and Analysis of Rotorcraft (NDARC) software is utilized to ensure that mission requirements and sizing constraints are met. Furthermore, future work considers guidance, navigation, and control requirements to satisfy mission objectives, and an initial construction for a simplified LILI small-scale prototype.
Schatzman, NatashaYoung, LarryDominguez, MichelleLee, PascalNagami, KeikoCaudle, DavidPichay, Isabelle
Advanced Air Mobility (AAM) is an innovative concept that aims to revolutionize air transportation through electric and unmanned aircraft, enabling applications such as urban air taxis and medical transport. However, one of the key challenges to its widespread adoption is ensuring safety, particularly in collision avoidance. This study focuses on the development of a perception and guidance system for avoiding collisions with non-cooperative targets, which do not share their position or trajectory. To achieve this, a Frequency-Modulated Continuous Wave (FMCW) radar and an InfraRed(IR) camera are used. Compared to traditional pulsed or panel radars, FMCW radars offer higher resolution, better detection of small and slow-moving objects, and improved performance in cluttered environments. The IR camera enhances situational awareness by providing visual confirmation and additional tracking capability, making this sensor fusion approach particularly suitable for AAM applications. Our collision avoidance system follows ACAS Xu standards, which provide autonomous conflict detection and resolution for unmanned aerial vehicles. The maneuver selection process is based on precomputed lookup tables generated through a Markov Decision Process (MDP), optimizing responses based on risk and energy consumption. The entire system is tested in a simulation environment using Ansys AVxcelerate, a physics-based simulator capable of generating realistic sensor data. This approach allows for comprehensive testing of detection, tracking, and maneuver execution in a highly realistic scenario, ensuring the effectiveness of the proposed solution before real-world deployment.
Brivio, RiccardoCrippa, AnnaBaiguera, MatteoPortanti, SamueleBertolo, Mattia
This paper presents the development and implementation of a complete flight control architecture for a 200kg-class tilt-wing eVTOL aircraft, designed and tested by Dufour Aerospace. The system enables fully automated flight across all regimes, including hover, transition, and cruise. A modular control architecture is described, incorporating a unified vehicle controller, envelope protection, and a guidance system. The control design leverages classical and modern techniques, including model-based synthesis, control allocation, and gain scheduling. A structured software development and validation pipeline is outlined, combining simulation, software- and hardware- in-the-loop testing, and flight testing on both subscale and full-scale platforms. Results from recent autonomous flight trials of the Aero2 aircraft demonstrate precise trajectory tracking and robust performance. The presented approach highlights the feasibility of rapid development cycles while maintaining high standards of safety and reliability for certifiable eVTOL platforms.
Cook, JacobTataru, DanielStudiger, MatthiasMinkova-Walker, MirelaKaradayi, MuscanSchmid, Sebastian
ABSTRACT Automatic guided vehicles (AGV) have made big inroads in the automation of assembly plants and warehouse operations. There are thousands of AGV units in operation at OEM supplier and service facilities worldwide in virtually every major manufacturing and distribution sector. Although today’s AGV systems can be reconfigured and adapted to meet changes in operation and need, their adaptability is often limited because of inadequacies in current systems. This paper describes a wireless navigated (WN) omni-directional (OD) autonomous guided vehicle (AGV) that incorporates three technical innovations that address the shortfalls. The AGV features consist of: 1) A newly developed integrated wireless navigation technology to allow rapid rerouting of navigation pathways; 2) Omnidirectional wheels to move independently in different directions; 3) Modular space frame construction to conveniently resize and reshape the AGV platform. It includes an overview of the AGVs technical features and how the flexibility and agility can be adapted to fit military and commercial application. The AGV is being evaluated as a mobile work station platform and a precise material handling robot.
Cheok, Ka CRadovnikovich, MichoFleck, PaulHallenbeck, KevinGrzebyk, SteveVanneste, JerryLudwig, WolfgangGarner, Robert
ABSTRACT Determining the required power for the tractive elements of off-road vehicles has always been a critical aspect of the design process for military vehicles. In recent years, military vehicles have been equipped with hybrid, diesel-electric drives to improve stealth capabilities. The electric motors that power the wheel or tracks require an accurate estimation of the power and duty cycle for a vehicle during certain operating conditions. To meet this demand, a GPS-based mobility power model was developed to predict the duty cycle and energy requirements of off-road vehicles. The dynamic vehicle parameters needed to estimate the forces developed during locomotion are determined from the GPS data, and these forces include the following: the gravitational, acceleration, motion resistance, aerodynamic drag, and drawbar forces. Initial application of the mobility power concept began when three U.S. military’s Stryker vehicles were equipped with GPS receivers while conducting a proofing mission at the Pohakuloa Training Area (PTA) in Hawaii on a soil with a known rating cone index (RCI). An analysis was conducted on the GPS data which allowed for the variation in the Stryker’s mobility power to be estimated as the vehicle traversed the terrain. The subsequent power duty cycle and required energy for the vehicle was determined along with predicted specific energy consumption and production values. Initial validation of the mobility power model began by tracking a hybrid 2006 Toyota Highlander during acceleration tests and on-road maneuvers. The model had an R2 and average absolute percent error of 0.91 and 12.9% respectively during the acceleration tests. The predicted and measured mobility power duty cycles were similar during the on-road maneuvers while an R2 and average absolute error of 0.44 and 7.1 kW was attained.
Ayers, PaulBozdech, George
Fusion Artificial Intelligence Link Synchronization Array for eVTOL Systems (FAILSAFES™) is a resilient and redundant timing and positioning architecture based on low Size, Weight, Power, and Cost (SWaP-C) RF Ranging links for eVTOL systems navigating with Global Navigation Satellite System (GNSS) in degraded or denied environments. This paper describes the overall FAILSAFES™ concept and discusses the underlying Complementary Positioning, Navigation, and Timing (CPNT) capabilities based on ENSCO's PicoRangerTM Array technology (PRAT). PRAT provides an array of low-cost RF ranging links between FAILSAFES™ ground stations and aircrafts to support navigation and timing distribution in GNSS degraded or denied environments. This paper will explore components of FAILSAFES™ and discuss initial PRAT based fusion results with respect to frequency and time stability.
Myrick, WilMatarese, TomTolfree, Mike
The purpose of this standard is to recommend minimum performance requirements to assist the specification writer in establishing a failsafe airplane interior Fluorescent light assembly design. This standard relates to the design of lamp ballasts, lampholders, fixtures, and installation of the same.
A-20C Interior Lighting
ABSTRACT
Tennakoon, KusalSilva,  OscarGosine,  RaymondMaan,  GeorgeJayasiri, Awantha
Autonomous flight remains a major challenge for Nano Unmanned Air Vehicles (NUAVs). This research presented a light-weight vision-based navigation system which is suitable for NUAV rotorcrafts with restrictively limited payload capacity and computing resources. A visual-inertia compensation approach was proposed to obtain accurate indoor navigation and guidance for the homemade NUAV which weighting less than 50 g. The proposed visual guidance algorithm have been successfully recognized targets such as windows, gates, and narrow-corridor with 25 Hz guidance command output. Flight experiments shown that the NUAV rotorcraft can follow the path planning to achieve autonomous flight, and guide through gates and windows within GPS-denied indoor environment.
Wang, GuanlinLi, DehuiXu, PanpanLuo, BiuzhouWang, XiuliXu, Beiju
Vehicle Safe-Mode, Concept to Practice Limp-Mode in the Service of Cybersecurity11-02-02-00062/27/2020
This article describes both a concept and an implementation of vehicle safe-mode (VSM) - a mechanism that may help reduce the damage of an identified cyberattack to the vehicle, its driver, the passengers, and its surroundings. Unlike other defense mechanisms that try to block the attack or simply notify of its existence, the VSM mechanism responds to a detected intrusion by limiting the vehicle’s functionality to safe operations and optionally activating additional security countermeasures. This is done by adopting ideas from the existing mechanism of Limp-mode that was originally designed to limit the damage of a mechanical, or an electrical, malfunction and let the vehicle “limp back home” in safety. Like Limp-mode, the purpose of safe-mode is to limit the vehicle from performing certain functions when conditions arise that could render full operation dangerous: Detecting a malfunction in the Limp-mode case is analogous to detecting an active cybersecurity breach in the safe-mode case, and the reactions should be analogous as well. We demonstrate that the VSM can be implemented, possibly even as an aftermarket add-on: to do so we developed a proof-of-concept (PoC) system and actively tested it in real time on an operating vehicle. Once activated, our VSM system restricts the vehicle to Limp-mode behavior by guiding it to remain in low gear, taking into account the vehicle’s speed and the driver’s actions. Our system does not require any changes to the electronic control units (ECUs), or to any other part of the vehicle, beyond connecting the safe-mode manager (SMManager) to the correct bus. We note that our system can rely upon any deployed anomaly-detection system to identify the potential attack. We point out that restricting the vehicle to Limp-mode-like behavior by an aftermarket system is just an example. If a car manufacturer would integrate such a system into a vehicle, they would have many more options, and the resulting system would probably be safer and with a better human-machine interface.
Dagan, TsvikaMontvelisky, YuvalMarchetti, MircoStabili, DarioColajanni, MicheleWool, Avishai
Electronic Travelling Kit for Navigation of Visually Challenged Individuals2019-28-016210/11/2019
Navigation of visually challenged persons is found tough, as they frequently do not get the essential details for escaping the perils and risk they come across when they want to reach a destination. Modernization of the world leads to the usage of technologically equipped devices to make compact and cost-effective setup. In order to help the visually impaired person to navigate securely swiftly an impediment identification system employing techno equipment such as Ultrasonic Sensors (US) and Universal Serial camera-based visual navigation system is proposed. The proposed framework identifies obstruction via the US and transmits audio signals as feedback to guide the individual about the location to be reached. Moreover, for capturing the location where the person has to move a universal serial bus (USB) webcam is employed. USB webcam is also deployed to distinguish between a human and an obstacle. In order to identify the persons well known to the visually challenged and also the presence of other human movements a face recognition system using image processing is adopted in the proposed system. The General Packet Radio Service (GPRS) aids in giving the directions and the current location of the person with the Google map voice command. Bluetooth low energy (BLE) and Radio Frequency Identification (RFID) technology are being used for indoor navigation. Bluetooth beacons are used to trace the user exact location and the user is also guided to reach the destination by placing RFID tags at different sites. A cost-effective electronic traveling aid using voice and GPRS support is proposed.
Rathinam, RajarajeswariDayalan, SuchitraMathews, Harris
The North Dakota Citation Research Aircraft Measurement Platform2019-01-19906/10/2019
The North Dakota Citation Research Aircraft is a Cessna Citation II twin-engine fan-jet aircraft modified to be an atmospheric research platform that has been used on many field projects since the 1970s. The typical sampling speed of the modified Citation II is 160 knots indicated air speed (IAS), with sampling at altitudes up to 12.1 km (40,000 ft). The Citation Research Aircraft was operated by the University of North Dakota (UND) for many years but is now operated by Weather Modification International (WMI) of Fargo, North Dakota. WMI and UND together provide a unique test facility that is capable of deploying a wide range of instrumentation. WMI has the experience to install the custom instrumentation required for a specific field project and the expertise to conduct the most demanding aircraft sampling, including thunderstorm in-situ measurements. UND provides scientific know-how on obtaining measurements at the required accuracy and experience to ensure instruments are performing well. Robust, open-source software tested for over 15 years provides the ability to quickly process data to enable analysis to begin shortly after completion of an aircraft flight. Visualization software allows observations to be efficiently quality-assured, which enables timely creation of a final data set that can be analyzed to meet each project’s scientific objectives. Past and ongoing projects include working with large and small companies to test airborne instruments and conduct natural icing studies. Specialized data processing methods have been implemented to obtain the liquid and total water content measurements at high accuracy. With continuing reduction in the size and power requirements of instrumentation, the future will allow the North Dakota Citation Research Aircraft to make an increasing number of observations which utilize more sophisticated processing software.
Delene, DavidHibert, KurtPoellot, MichaelBrackin, Neil
Emerging microelectronic technologies are expanding functionalities for future decades of vertical lift platforms, enabling both manned and unmanned rotorcraft to fully and safely participate in the NextGen National Airspace System. Specifically, for rotorcraft, benefits from expanded multi-functionality and reduced weight and space requirements, for both mandatory and desired optional avionics, are entering advanced development and flight-testing stages prior to being available to all users. One has only to think about the incredible, multifunctional capabilities of a smartphone to imagine what is possible in avionics with today's advanced technology. This presentation discusses achievements that only a few years ago were beyond imagination – miniaturized avionics that fully employ tiny but powerful digital processors and software defined multi-functional systems on a single chip are rapidly obsoleting the "black boxes" of the past. For both manned and unmanned rotorcraft systems, the benefits must be validated; and when proven valid, are immense in terms of lighter weight, tiny form factors, and lower costs. This presentation also addresses validation of ADS-B2, which depends on verification of GPS signals with technological approaches that counter potential malicious spoofing, jamming and interference.
Contarino, RaNaeHealing, RichardContarino, V.
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