In this letter, a novel low-complexity detector based on the concept of compressive sensing (CS) is proposed for multiple-input multiple-output system, namely, quadrature spatial modulation (QSM). particular, CS algorithm performed in real-valued system model, and activated antenna indices, which are used to transmit real imaginary parts QSM symbols, can be estimated separately. order further improve performance QSM, search strategy proposed. Simulation results show that capable achieving...

The centralized Kalman filter is always applied in the velocity and attitude matching of Transfer Alignment (TA). But has many disadvantages, such as large amount calculation, poor real‐time performance, low reliability. In paper, federal (FKF) based on neural networks used TA, adjusted by two subfilters, to fuse information global suboptimal state estimation obtained. result simulation shows that better estimating initial misalignment angle inertial navigation system (INS) when dynamic...

Aiming at the problem of combined navigation system on-board GNSS (global satellite system)/SINS (strapdown inertial system), accuracy decreases due to dispersion SINS over time and under condition No signals. An improved LSTM (long short-term memory) neural network in signal conditions is proposed assist combination data positioning algorithm. When normal input, current module’s output sensor information used for training improve algorithm establish incremental position mapping different...

Summary In the big data era, information security is becoming more and important. The recent scandal of privacy on Facebook sounded warning bell for us. Based utility theory, this paper proposes that disclosure behavior consumer personal mainly influenced by two factors, which are perceived risk benefit, respectively. When consumers make decisions, they weigh risks benefits. If income greater than risk, willing to provide website vice versa. This analyzes serious threats safety commercial a...

In practical engineering, the frequency splitting of Hemispherical Resonator Gyro (HRG) caused by uneven mass distribution seriously affects precision HRG. So, inherent is an important parameter micro-Hemispherical (m-HRG). processing hemispherical resonator, there are some morphological errors and internal defects in which affect working mode m-HRG, reduce performance m-HRG. order to improve partial differential equation resonator solved, three-dimensional model using ANSYS software...

Hemispherical Resonator Gyro (HRG) is a new type gyro with high precision, reliability, shock resistance, no need of preheating, short start time, and long life. It kind vibrating standing wave rotating along the sensitive base annular precession, has unique application prospect in field precision inertial sensors, widely used unmanned aerial vehicle control complex environments. Based on theory structure characteristics hemispherical resonator, mathematical model energy resonator...

Because the accuracy of existing airborne navigation is lacking in polar region, it difficult to ensure safety and reliability aircraft when flying over region. The integrated system based on inertial technology uses multi-information fusion assist collaborative obtain an indirect grid algorithm that combines azimuth solve problems. This paper analyzes principle semiphysical simulation experiments are carried out by using theory background engineering, accuracies frame region middle low...

As the inertial navigation system cannot meet precision requirements of global in special geographical environment Polar Regions, this paper presents Strapdown Inertial Navigation System (SINS)/Celestial (CNS) integrated airborne based on Grid Reference Frame (GRF) and simulation is carried out. The result shows that SINS/CNS superior to single subsystem performance, which not only effectively inhibits error caused by gyro drift but also corrects parameters without delay. Comparing middle...

Electromagnetic particle-in-cell (PIC) simulation has been widely used in controlled thermonuclear fusion, space physics, free electron laser, high power microwave and the research of plasma. In this paper, basic algorithms parallel algorithm PIC are studied respectively. And then a complete code implementation mentioned above, CHIPIC3D, is presented, which written by Fortran language to simulate vacuum source device. At last, several device results acquired on Milky Way high-performance...

For the rapid response of aircraft, it is required that aircraft not only quick but also chooses shortest flight routes. The great circle track route on earth between any two points, needs to cross polar region when flies over hemispheres East and West. Because has some particularity, such as landform characteristics, climatic conditions, vast territory, transpolar key technology global navigation. This article researched algorithm SINS/GPS integrated navigation system analyzed result...

In this study, for energy compensation in the whole-angle control of Hemispherical Resonator Gyro (HRG), dynamical equation resonator, which is excited by parametric excitation discrete electrode, established, stability conditions are analyzed, and method double-frequency electrode derived. To obtain optimal total resonator simulated evolution vibration with different parameters free precession standing wave excitation. addition, HRG designed, proven experiments. The results experiments show...

In order to study the effects of two strategies non-linear supply chain with and without shortage on dynamic behavior remanufacturing system, a system model non-return constrained by current level service recovery capacity maximum is established, which more in line actual situation. accurately analyze performance so as effectively suppress impact uncertainty ultimately achieve stable operation research process nonlinear deepened fuzzy robust control method deeply studied. The mitigation lead...

In the high-speed railway wireless communication, a joint channel estimation and signal detection algorithm is proposed for orthogonal frequency division multiplexing (OFDM) system without cyclic prefix in doubly-selective fading channels. Our method first combines basis expansion model (BEM) inter symbol interference (ISI) cancellation to overcome situation that exists with fast time-varying normalized maximum multipath exceeding length of (CP). At first, can be approximated considering...

The precision of the strapdown inertial navigation system (SINS) depended on work gyroscope. However, many errors affect SINS even if gyroscopes have perfect principles and structures. Before application (INS), components must be calibrated to ensure performance components, detect whether component satisfied system, compensate for error INS. According mathematical model fiber optic gyroscope (FOG), we propose a multi-position iterative recursive calibration algorithm scale factor...

The force-to-rebalanced control mode is the main operating mechanism of HRG, and standing wave azimuth resonator points to 0° direction. But bias HRG very sensitive change external physical field environment it urgent improve stability. relationship between periodic. When damping axis are aligned, error will be greatly reduced, stability affected by temperature can also improved changing wave. In this paper, algorithm hardware circuit designed at any azimuths. in different azimuths realized,...

In order to improve the precision of spaceborne Inertial Measurement Unit (IMU), this paper proposes an adhesive joint assembly MEMS-redundant IMU. That is application special redundant installation multiple MEMS gyroscopes in IMU, which can reliability IMU on basis reducing weight However, with change working environment, traditional mechanical will produce large packaging stress and cause deformation gyroscope. This lead changes errors, scale factor bias errors gyroscope, resulting a...