This paper proposes a novel Hybrid Electric Propulsion System (HEPS) architecture based on adaptive droop control, comprising Permanent Magnet Synchronous Generator (PMSG), Fuel Cell (FC), and Lithium-ion (Li-ion) battery. The system employs voltage-compensated control strategy integrated with state machine energy management (SMEMS), enabling the three sources to coordinate effectively meet power demands of aircraft efficiently under various operating conditions. includes detailed analysis...

The U-shaped structure is presented for designing a dual-band circularly polarized (CP) slot antenna that has single metallic layer and fed by coplanar waveguide (CPW). To evaluate the performance of versatile structure, U-slot U-strip have been designed 2.6/3.6 2.5/3.5 GHz bands application. By employing Differential Evolution (DE) algorithm to optimize some primary parameters proposed antennas, optimum impedance axial-ratio bandwidths at given operating frequency can be achieved without...

This letter proposes a differential evolution (DE) with matrix mapping for sparse rectangular planar array synthesis technique multiple constraints. The constraints include the number of elements, aperture, and minimum spacing adjacent elements. By introducing novel between element variables DE, strong constrained optimization problem is transformed to nonconstrained only lower upper limits, infeasible solutions are naturally avoided during process. simulation results show high efficiency...

Energy conservation has been known as the most important issue for many applications in wireless sensor networks (WSNs). For data gathering a clustered network, existing work focuses on fusing at cluster heads (CHs). However, target tracking applications, these approaches do not consider that one is usually detected by nodes multiple clusters, which leads to redundant transmissions from CHs sink so waste much energy. To solve it, this paper proposes coordinated and adaptive information...

Aiming at the problem of positioning failure caused by insufficient number anchor nodes in wireless sensor network (WSN), this work introduces Inertial Measurement Unit (IMU) into WSN and proposes a hybrid IMU/ultra-wideband (UWB) multisource fusion cooperative algorithm for single-anchor networks. In work, UWB measurement information is used to construct spatial relationship between neighbors, IMU employed obtain position offset target adjacent time. Benefiting from IMU, multiple ranging...

One important way to extend the lifetime of wireless sensor networks (WSNs) is manage sleep scheduling nodes after they are deployed. Most existing works on node mainly concentrate which have only one sensor, and regard a its modules as whole scheduling. Few involve sensed nodes, multiple sensors. However, some (such video sensor) consume lot energy. Therefore, less energy efficiency for multisensory networks. In this paper, we propose distributed energy-balanced strategy (EBMS), considers...

Adaptive antenna arrays have been used to mitigate the interference on global navigation satellite system (GNSS) receivers. The performance of mitigation depends beamforming algorithms adopted by array. However, adaptive will change array pattern in realtime, which has potential introduce phase center biases into For precise applications, these must be mitigated or compensated because they bring errors code and carrier measurements. A novel algorithm is proposed firstly, then bias induced...

In this paper, an accurate small-signal impedance model of variable frequency AC three-stage generator (VFAC-TSG) is established, and the terminal characteristic VFAC-TSG under closed-loop modes deduced in detail. Some simulations are performed to verify theoretical correctness. This work a foundation for future research on stability.

As the core of secondary energy system more/all electric aircraft, aircraft power (EPS) has essential research value. It carries important function converting chemical (aviation fuel, storage battery, energy) into electrical and mechanical energy, which is crucial to overall global optimization design aircraft. This paper selects typical hybrid analyzes EPS architecture methods, concludes critical technologies from health management, intelligent distribution, capacity configuration, fault...

Antenna arrays with space-time adaptive processing (STAP) have been widely used in Global NavigationSatellite System (GNSS) to suppress interference spatial domain as well temporal domain, its performance depends on digital beamforming algorithms.In this paper, we propose a joint algorithm which produces nullings the directions of while simultaneously maximizing carrier-to-noise ratio (C/N 0 ) post-correlation signal.Firstly, interferences are cancelled by using subspace orthogonal...

In target tracking WSNs, the tree-based and cluster-based network should be rebuilt when location of changes, which involves energy time overheads. Although chain structure solves this problem, it lots unnecessary nodes unacceptable transmitting delay. Therefore, we propose a dynamic chain-based collaboration (DCBC) approach for efficient data gathering in paper. DCBC completes task by forming around target. With moving, is adjusted pruning some as long they are out range adding entered...

Adaptive antenna array, which mitigates interference signals by the spatial adaptive processing (SAP), has been widely used for suppression in GNSS receiver. Moreover, space-time (STAP) is applied to improve performance of anti-jamming array. This paper analyzes working principles SAP and STAP, then shows STAP simulation. It proved that a better case multiple jamming signals. Finally, this validates processed still meet requirement acquisition tracking receivers comparing correlation peak.

Energy efficiency is very important for wireless sensor networks (WSNs) since nodes have a limited energy supply from battery. So far, lot research has focused on this issue, while less emphasis been placed the adaptive sleep time each node with consideration application constraints. In paper, we propose hierarchically coordinated power management (HCPM) approach, which both addresses conservation problem and reduces packet forwarding delay target tracking WSNs based virtual-grid-based...

In target tracking wireless sensor network, choosing the proper working nodes can not only minimize number of active nodes, but also satisfy reliability requirement. However, most existing works focus on selecting which are nearest to for missions and they did consider correlation location so that these approaches meet all goals network. This work proposes an efficient adaptive node selection approach a in distributed The proposed combines distance-based strategy particle filter prediction...

Global navigation satellite system signals are easily distorted by the interferences or disturbances, and global receivers cannot offer continuous effective results in challenging environments. As a representative regional augmentation technology, pseudolite has potential to provide accurate positioning service satisfy specific performance requirements various applications. In this article, we developed dynamic localization network based on technology for purpose. First, collaborative...

Energy efficiency and data transmission delay are critical issues for mobile target tracking wireless sensor networks, in which abundant nodes deployed to collect the information from sensing field. At present, many existing works have been concentrated on extending network lifetime, while less emphasis was placed both reduction adaptive sleep of considering application constraints. In this paper, we propose a smart power management approach based grid structure, where adjust their intervals...

In this paper, we proposed a novel method to estimate the normal information of unorganized point cloud, which plays an essential part in 3D reconstruction. The original cloud is firstly divided into cubes with different sizes by octree method. Then, fit algebraic sphere each cube instead planar surface improve accuracy estimation. Finally, raw normals are refined weighting function increases along depth octree. For evaluation, compute intersection angles between estimated and corresponding...

Summary Passive localization method has a wider applicable prospect as rising resort with well flexibility. The acquisition of phase difference changing rate is very practical problem in passive for the way how to get difference, and better error precision directly affects accuracy localization. Firstly, based on analysis positioning principle rate, it studies characteristics proposes novel resolving ambiguity algorithm double baselines system cosine theorem (DBSCT), which can eliminate...

Many safety-critical applications that utilize the global navigation satellite system (GNSS) demand highly accurate positioning information, as well integrity and reliability. Due to GNSS signals are easily distorted by interferences or disturbances, signal quality monitoring (SQM) is necessary detect presence of dangerous distortions. In this paper, we developed an SQM software for binary offset carrier (BOC) modulated signals. Firstly, models BOC with ideal distortion presented...