With the development of urban intelligence, the indoor positioning services based on WiFi received signal strength (RSS) have attracted extensive attention of society. The deep learning technology is a powerful method to achieve high indoor positioning performance using RSS signal. However, it is vu...

To study the electromagnetic scattering characteristics of the TX-1 microsatellite, an electromagnetic calculation model with a stealthy shape is established. The physical optics (PO) is used to numerically calculate the radar cross section (RCS) under different conditions to verify PO accuracy thro...

This study investigates the inlaid floating ring seal with high-speed gas films in aeroengines, focusing on the opening performance of the seal with different structural parameters, starting modes, and material combinations. The solid domain model and the gas film fluid domain numerical analysis mod...

In the execution of space missions, the hyper-elastic boom is mainly used in the deployment and support of large space deployable antennas and solar sails. In order to improve the supporting effect of the hyper-elastic boom in the state of deployment, the stiffness of the M-shaped hyper-elastic boom...

To evaluate the hitting accuracy of hypersonic vehicles scientifically and reasonably, this paper proposes a high accuracy evaluation method using the error spectrum. First, the hit accuracy data of hypersonic vehicles are preprocessed to obtain the relative distance error. Secondly, the root mean s...

This paper presents an autonomous navigation method based on proximal policy optimization (PPO) algorithm for mobile platform. In this method, GNSS and LADAR are used for sensing environment information. To define the state of reinforcement learning model, an ego position evaluation method is introd...

According to the chemiluminescence reaction mechanism of nitric oxide and ozone, a new cylindrical total reflection S-type optical cavity design for rapid detection of nitric oxide gas is proposed. The optical cavity model is based on the total reflection S-type structure on the inner wall of the cy...

The runway surface temperature short-term accurate prediction is one of the key factors for runway icing warning.In order to solve the problem of error accumulation caused by a single mechanistic model with increasing prediction time, a hybrid runway temperature prediction method under ice and snow ...

It is of great significance to study new energy technologies for loaders, which have high energy consumption and poor emissions. Combined with the operating characteristics of the loader, this paper proposes a power supply system driven by fuel cell and super capacitor. Our research focused on adapt...

In order to effectively reduce the weight of sensor data acquisition and transmission system for the new-generation launch vehicle, a wireless sensor system based on chip CC1310 was designed and implemented. Multi-node networking and group management are accomplished using frequency division multipl...

The rain streaks attached to the image seriously affect the analysis and follow-up research of the image information. To restore the background texture damaged by rain streaks, this paper proposes a lightweight densely connected network based on attention mechanism to remove rain from a single image...

With programmable power output capabilities, global positioning system(GPS) Block IIR-M and Block IIF satellites can flexibly enhance transmit power of individual signal components. In order to systematically evaluate the power enhancement capability of GPS P(Y) codes, the theoretical analysis of th...

An ultra-local model-free speed predictive control (MFSPC) method based on an extended state observer (ESO) is proposed to address the control performance decrease of permanent magnet synchronous motor (PMSM) due to parameter changes and external disturbances, and to solve the one-step delay problem...

An atomic clock is one of the most critical loads of a navigation satellite. It is thus of great significance to carry out the work related to the health assessment and residual life prediction of atomic clocks to understand the performance and the health status of the atomic clock in time and to en...

Aim at solving following problems. Firstly, the limited deflection angle of the cylindrical Lorentz force magnetic bearing (LFMB) can leads to the short duration of torque output of magnetically suspended control and sensing gyroscope (MSCSG). Secondly, the low uniformity of magnetic density between...

As one of the common degradation forms of metal structure exposed to the corrosive medium, pitting may cause the local stress concentration and decrease the strength, reliability and safety of the structure of equipment. Thus, an exact pit model is useful for the stress distribution analysis of the ...

To solve the problem of unmanned aerial vehicle (UAV) coordinated rounding up, a strategy was proposed based on the unity of group will. Inspired by the cognitive mechanism of human beings in collaborative tasks, this paper introduces "group will" to define the collaborative cognition of UAVs, build...

Global navigation satellite system (GNSS) is the most widely used positioning technology at present. Due to high-rise structures blocking the signal, the performance deterioration caused on by non-line-of-sight propagation still remains while studying the positioning problem in urban canyons. In ord...

Based on Shallow-Water icing thermodynamic theory, an unsteady icing model is developed to simulate icing on three-dimensional rotating surfaces. Jacobi and Gauss-Seidel iterative algorithms are adopted to numerically solve the governing equations of unsteady processes of surface icing. This method ...

For the powered descent phase of the reusable launch vehicle, various strict process constraints, terminal constraints and requirements on fuel saving exist, which bring great challenges to the guidance. This paper proposes a trajectory tracking guidance method based on convex optimization and linea...

The traditional method of robot parameter target usually requires an expensive equipment, and the technical realization cost is high, a novel low-cost calibration method for manipulators is proposed, which utilizes a laser displacement sensor installed on the end of the manipulator to measure the re...

A mobile robot operates in a dynamic environment, so it must react quickly, maintain a clear path, and keep a safe distance from obstacles. To solve this problem, this paper proposes a dynamic obstacle avoidance method for mobile robots based on the obstacle cost potential field. By establishing a s...

This study aims at analyzing the coupling relationship between disturbance variables and miss distance of air-to-air missiles in infrared anti-jamming. Massive data are obtained by setting disturbance variables through an experimental simulation platform. The data cube is then constructed to preproc...

Compressed sensing (CS) theory has been applied in synthetic aperture radar (SAR) in the recent years. A 2-D CS SAR imaging method is proposed using mixed sparse representation (MSR) based on approximate observation model in non-sparse scene compressed sensing SAR imaging. Firstly, non-sparse scene ...

To fully understand the risks of civil aircraft and learning from accidents, the major civil aircraft accidents (MCAA) are used as the research object to dig out its deep-level causal characteristics. Due to the poor readability information and nonlinear system behavior of MCAA, it is difficult to d...

To achieve effective detection of "low, slow and small" unmanned aerial vehicle(UAV)and improve detection accuracy and positioning quality, we propose a low-altitude UAV detection method based on joint attention and CenterNet. Aiming at the problem of high miss-detection rate of small targets in gen...