WiFi-Fingerprint is extensively utilized for indoor localization with the advent of high-density wireless networks deployment and research on ubiquitous intelligence. Nevertheless, establishing an elaborate radio map a highly time-consuming task. Aiming to alleviate this problem enhance WiFi-based accuracy, paper has done following contributions. First, we present Gaussian process regression models predict spatial distribution signal strength in uncalibrated domain limited known labeled...

Due to the advent and pervasive deployment of wireless local area networks, WiFi-based indoor localization systems have received increasing attention in last few years. However, their accuracy has always been a challenging issue. In addition, because diverse interference such as multipath effects, block signals, an unstable or weak signal itself, etc., not all access points (APs) are informative for localization. Faced with these problems, we propose model by modifying large errors enhancing...

In this manuscript, a novel ISAR imaging method for large target under ultrahigh resolution condition is proposed. Certain problems in the existed algorithms imagery are discussed. The caused by Keystone Transform of bandwidth and long coherent processing interval analyzed. Moreover, various means focusing signals with polynomial phase analyzed as well. order to solve these problems, sub-aperture nonlinear chirp scaling (SA-NCS) algorithm presented. This divides data...

Dynamic resectorization is a promising concept to accommodate the increasing and fluctuating demands of flight operations in National Airspace System. At core dynamic finding an optimal sectorization. Finding such sectorization challenging, because it mixes graph partition problem non-deterministic polynomial-time-hard optimization problem. This paper revisits Voronoi diagrams genetic algorithms, proposes strategy that combines these algorithms with iterativedeepening algorithm. accomplish...

Aiming at the problems that whale optimization algorithm is easy to fall into local optimal, slow convergence speed and low accuracy in complex environment of multi-variable processing, it has always been challenging practical application. In this paper, a new hybrid modified (HIWOA) proposed, which adds feedback mechanism improve population diversity reduce possibility falling optimization. The nonlinear factor inertia weight coefficient are used updating individual position accuracy....

The concepts of unmanned aircraft system traffic management (UTM) and urban air mobility (UAM) are introducing high-density operations in low altitude airspace closer proximity to populated areas than conventional high-altitude traffic. Flexible engine for Fast-time Evaluation Flight Environments (Fe (sup 3)) provides the capability statistically analyzing high-density, high-fidelity, low-altitude under numerous scenarios, such that stake holders can study impacts factors define...

A new airspace design concept, tube networks, could enable high-density operations with less air traffic control workload. To construct tubes optimally, it is necessary to identify the commonality of flight trajectories. This paper proposes a strategy cluster great circle trajectories for forming tubes. The Hough transform applied groups or clusters that form networks. genetic algorithm then optimize network. Results show small deviations from routes yield accommodate significant levels...

Corridors-in-the-sky is a new airspace structure designed to accommodate high density trac by grouping flights with similar trajectories. Less air controller workload expected than classic structures. Thus, corridors-in-the-sky may increase national capacity and reduce flight delays. To evaluate/design corridors-in-thesky, besides identifying locations, their utilization, altitudes, impacts on non-corridor need be analyzed. Although not providing complete analysis, this paper chooses single...

Coordination of operations with spatially and temporally shared resources, such as route segments, fixes, runways, improves the efficiency terminal airspace management. Problems in this category are, general, computationally difficult compared conventional scheduling problems. This paper presents a fast time algorithm formulation using nondominated sorting genetic algorithm. It was first applied to test problem introduced existing literature. An experiment showed that new methods can solve...

This work introduces an approach to estimate the complexity of a low-altitude air traffic scenario involving multiple UASs using mathematical programming. Given set multi-point UAS flight trajectories, vehicle dynamics, and conflict resolution algorithm, abstract model is developed such that it can be solved quickly programming optimization software without running high-fidelity simulations computationally expensive may not suit real-time apA quick accurate assessment for given help plan...

Runway-independent aircraft have been proposed to increase passenger throughput at crowded urban airports via the use of vertiports or stub runways. Simultaneous non-interfering (SNI) traffic procedures will minimize impact on existing fixedwing traffic. This paper introduces a SNI trajectory generation algorithm that treats fixed-wing corridors as impenetrable obstacles and optimizes over multiple parameters including ground noise, fuel, time. Flight envelope limits are represented...

In the national airspace system, sectors get overloaded due to high traffic demand and inefficient designs. Overloads can be eliminated in some cases by redesigning sector boundaries. This paper extends Voronoi-based design method automatically selecting number of sectors, allowing three-dimensional partitions, enforcing pattern conformance. The was used at Fort-Worth Indianapolis centers for current scenarios. Results show that new designs eliminate although not all cases, reduce necessary...

Inspired by the energy savings that migrating birds achieve when flying in formations, of interest is achieving a similar level with aircraft National Airspace System (NAS). In particular, typically more than 50,000 flights NAS on any given day, there much clustering so potential for creating formations. Most previous research this area has focused analyzing single formation ‐ developing computational models, performing wind tunnel tests, or controllers maintaining but little been done...

This work begins to address one of the critical questions in urban air mobility and small unmanned aircraft communities: Should en-route conflict resolution function an traffic system be centralized or decentralized? Three architectures are modeled analyzed: centralized, decentralized with uniform rules, mixed rules. study compares these investigates their robustness communication state information errors terms safety efficiency metrics. Experiments conducted using a high-fidelity Monte...

The corridors-in-the-sky concept imitates the highway system in ground transportation. benefit expected from a corridor relies on its capability of handling high density traffic with negligible controller workload, acceptance extra fuel or distance, and complexity reduction underlying sectors. This work evaluates selected these perspectives through simulations. To examine inside corridor, simulation tool that can resolve conflicts is developed using C language. Prescribed conflict resolution...