Soil moisture retrieval of the satellite-borne GNSS reflected signal (GNSS-R) is more susceptible to the influence of the changing environmental factors on the land. At present, there is little research on error correction and extrapolation performance analysis in the satellite-borne GNSS-R soil moi...

Beihang Aeronautical Satellite-1 is a scientific experiment satellite for wide-area aeronautical surveillance. The surveillance payload’s performance index and statistical methods are first put forward in order to assess the surveillance payload’s performance on Beihang Aeronautical Satellite-1. The...

To address the problem of poor separation of the signal-to-noise ratio (SNR) sequence trend items and the significant fluctuation of inversion result in the process of retrieving snow depth using global navigation satellite system multipath reflectometry (GNSS-MR), a snow depth inversion method base...

Autonomous positioning is an important task of mobile robots, and the problem of robot kidnapping is a difficult point in positioning technology. The adaptive Monte Carlo localization (AMCL) algorithm based on particle filtering can solve the problem of robot kidnapping, but it needed to put new par...

The influence of eye contrast threshold is neglected in the traditional calculation of daytime runway visual range (RVR). Therefore, this paper first theoretically analyzes the influence of the human eye contrast threshold on RVR measurement range and accuracy. Then, experiments are designed to meas...

The noise generation mechanism of weapon bays at a high Mach number (Ma>2) is different from that of the subsonic, transonic, and supersonic weapon bay flow because of the stronger and more stable shear layer. This discrepancy may also lead to different flow control measures for cavity noise supp...

Modern military flight systems are highly information-intensive and their tasks are complex and changeable. In order to explore the influence of information processing types and multi-task coordination on pilots’ mental workload, a quantitative prediction model based on the cognitive process was pro...

Numerical research was done on the heat transmission of supercritical CO₂ in a vertical helical tube based on the cooling heat transfer in the aeroengine intercooler. The influence mechanisms of the operating parameters on heat transfer along the flow and circumferential directions were investigated...

The thin atmosphere of Mars constrains the MAV in the subcritical Reynolds number regime, where the laminar boundary layer separation extremely adversely affects the aerodynamic performance of UAVs. Meanwhile, the low sound velocity of the Martian atmosphere results in a higher Mach number of UAVs, ...

In this paper, the convex optimization problem of the distributed second-order multi-agent systems under bounded disturbances has been studied. The distributed optimization problem aims to optimize the global cost function through local information communication. Based on the fixed-time theory, the ...

By reasonably designing the comparison model, a new test method for the injection factor of resin matrix composites is proposed. The arc wind tunnel test is carried out for the new resin matrix composites to obtain the wall heat flux density of resin matrix materials with and without pyrolysis gas i...

Compaction pressure is one of the crucial manufacturing process parameters of continuous fiber composite structures fabricated by automated fiber placement. Due to the high rigidity and insufficient position control accuracy of most automated fiber placements, compaction pressure fluctuates drastica...

To solve the contact detumbling problem of nutation non-cooperative targets with model uncertainty, a dual-channel adaptive control method based on characteristic model is proposed. The dynamic model of the detumbling system is established considering the geometric relationship during the contact co...

The measurement noise for global navigation satellite system/strapdown inertial navigation system (GNSS/SINS) suffers from abrupt changes due to the easy interference of GNSS signals. In this paper, a novel fading memory variational Bayesian adaptive Kalman filter (VBAKF) with variable attenuating f...

The development trend of small volume, high density, and high clock frequency of integrated circuits and electronic equipment leads to serious electromagnetic compatibility problems, especially electromagnetic susceptibility problems. The electromagnetic susceptibility level of integrated circuits a...

A new aerodynamic configuration concept for a hypersonic vehicle with a high lift-to-drag ratio is proposed to satisfy the constantly increasing practicability multi-constraints of high volumetric efficiency, control and stability, and acceptable thermal protection. The design principles of this pra...

The man-machine cooperation system can make full use of the advantages of human intelligence and the high precision and efficiency of robot operation. The substantial control burden placed on pilots results from their requirement to analyze a huge quantity of information in real time and provide pre...

The prediction of friction factors based on multi-scale methods has become a research hotspot. The influence of temperature is the main issue for mechanical systems that operate at high temperatures, such as aero-engines. In this paper, we propose a novel method for predicting friction factors based...

A method of initial state estimation of scrambling code based on solving the error equation is provided in order to address the issue of a low correct estimation rate of the initial state of scrambling code under a low signal-to-noise ratio. According to the initial state recurrence relation, the re...

Distributed electric propulsion (DEP) aircraft makes full use of the aerodynamic/propulsion coupling effect to improve the aerodynamic efficiency of the aircraft, but the increase in the amount of power leads to strong interference between the propeller slipstream and the wing surface flow field, th...

Long constraint length convolutional codes are used in the fields of satellite communication due to their strong anti-interference and difficulty in decipherment. However, there are shortcomings of low space utilization and high decoding complexity in the low signal-to-noise ratio environment. To ov...

To address the problem that the parasitic loop of the radar homing missile radome affects the stability of the guidance and control system, a three-dimensional nonlinear guidance loop model considering the radome error is established, and an analysis method on the stability of the guidance loop was ...

In order to reasonably utilize the prior information of congeneric equipment and improve the accuracy of parameters estimation and remaining useful life (RUL) prediction, a RUL prediction method based on multi source information considering the random effects is proposed. A linear Wiener process con...

To address the problems of high computational complexity and poor convergence efficiency of multi-UAVs cooperative path planning, a multi-UAVs 3D cooperative curve path planning method based on chaos elite adaptive genetic algorithm (CEA-GA) is proposed. A multi-UAVs 3D cooperative curve path hierar...

A compound unmanned helicopter is a non-linear and strongly coupled controlled plant with multiple redundant control inputs, and with its response varying with input strategies. The unmodeled internal structure dynamics and unknown external disturbances of the compound unmanned helicopter cause grea...

The formation control for multiple mobile robots under low communication load is investigated. A kinematics model of the nonholonomic constrained wheeled mobile robot is defined by coordinate transformation and the introduction of side slipping increment, which explicitly satisfies the pure rolling ...

A fast minimum distance function method for CT data (CT-FMDF) is proposed to address the artifact noise in CT image data of solid rocket motors, the large combustion surface roughness of actually formed grains, and the difficulty in transition calculation. The non-local means (NLM) filtering algorit...

Dijkstra ordering points to identify the OPTICS algorithm based on the Dijkstra routing algorithm is proposed to accurately analyze the hot spots areas with high passenger demand for online ride-hailing, which performs a spatial clustering analysis of high passenger demand hot spots areas using vehi...

An independent import and export control was developed, based on variable speed load sensitivity at mode switching, to address the issues of high efficiency but insufficient control precision of the pump control position system and rapid reaction but significant energy loss of the valve control posi...

An instantaneous torque control method for switched reluctance motors (SRM) based on improved terminal sliding mode controller (SMC) and sliding mode observer (SMO) with variable speed reaching law was proposed to address the issues of slow response speed of conventional terminal sliding mode contro...

In order to enhance the acceleration ability of turbofan engines, the traditional N-dot control structure is improved, and an active switching control strategy based on tracking error is proposed. When the tracking error is significant, the N-dot control loop is engaged; otherwise, the steady-state ...

A cross-domain person re-identification method based on progressive attention and block occlusion is proposed in order to address the issue of missing feature matching caused by occlusion and neglect of fine-grained discriminative features in cross-domain person re-identification. This method realiz...

To study the influence of the erosion deformation of the pre-stage wedge on the working characteristics of the jet pipe servo valve, the erosion simulation of the pre-stage is carried out by Fluent simulation software, and the simulation result is compared with the erosion object, which shows that t...

A closed-loop guidance solution based on a flight time predictor and a flight profile corrector is proposed for the time cooperative problem in the terminal guiding phase of hypersonic glide vehicles with continuous energy decay. Firstly, parameterized proportional guidance flight profile with negat...

With the popularization and application of lithium-ion batteries, the thermal safety problem in aviation low-pressure environments have has attracted wide attention. The lithium-ion batteries were induced to thermal runaway under the heating power of 30−100 W at 20−95 kPa. Through the analysis of th...