To address the problem of temporal feature extraction and recognition of high-resolution range profiles (HRRP) of midcourse ballistic targets, a recognition method based on bidirectional temporal convolutional networks with additive fusion (AF-BiTCN) was proposed, which could make full use of the bi...

Using signals broadcast by a large number of non-navigation low Earth orbit satellites as navigation sources can provide positioning, navigation, and timing (PNT) services independently of global navigation satellite system (GNSS). Due to the low signal-to-noise ratio and compound orthogonal spread ...

The manufacturing industry in China is undergoing a digital and green low-carbon transformation. To achieve energy saving and emission reduction and improve the equipment utilization rate, a mathematical model of the hybrid flow-shop scheduling problem considering the joint of machine and automated ...

To improve the wide area multilateration (WAM) accuracy when receiving S-mode baseband signals with low signal-to-noise ratio (SNR), a joint time of arrival (TOA) estimation algorithm based on non-coherent integration was proposed.According to the correlation characteristics of target reply signals ...

DC-DC converter in the total dose radiation environment will mainly bring the output voltage drift, linear adjustment rate load adjustment rate decline and other effects so that the output stability performance of the circuit deteriorates. In order to address the issues with the conventional total i...

The problems with the large complexity, low accuracy, and slow real-time performance of the current video crowd counting techniques in network models are addressed by a lightweight solution based on spatial shuffling and chain residual augmentation. The proposed model consists of an encoder, decoder...

Precise position information is the key to guaranteeing the successful implementation of low-earth-orbit satellite missions. The fixing of carrier phase ambiguities is important for the precise positioning and precise orbit determination of the GPS. The satellite-end hardware bias was corrected by u...

To study the dynamic stability of a single-point hanging container, the divergent motion of the hanging container was captured by a wind tunnel test, and the motion equation of the single-point hanging system was decoupled for dynamics analysis. It was found that the reason for the divergent motion ...

Reinforcement learning algorithm represented by flexible action evaluation (SAC) has been successful in reproducing the motor skills of higher animals. This framework combines strategy search and state action value function. However, the agent use strategy exploration is greedy, and the Q value func...

An electromagnetic coil launcher's muzzle velocity and launch efficiency are determined by critical system characteristics like circuit and structural design. To obtain higher muzzle velocity and launch efficiency, this article establishes an electromagnetic coil vertical launch model according to t...

With the gradual development of the aircraft self-separation operation and the continuous climbing operation (CCO) mode, it can effectively solve the problem that the departure path of aircraft in the current terminal area is fixed and single, which leads to the low operational efficiency of airspac...

A point cloud semantic segmentation method for unstructured road scenes, represented by open-pit mining areas, is proposed to address issues such as harsh environmental conditions, blurred road boundaries, and significant differences in obstacle sizes. The method includes preprocessing, feature extr...

To improve the overall scheme optimization efficiency of blended wing body (BWB) unmanned aerial vehicles (UAVs), a model involving multi-disciplinary analysis, comprehensive evaluation, and optimization suitable for the overall scheme of UAVs in the conceptual design stage was established, in consi...

To explore the influence of the restraint relationship between the wheel-holding mechanism and the nose landing gear wheel on the kinematic characteristics of the towing system, this paper established the relationship between the radial force and radial contact deformation of the aircraft nose landi...

This study focuses on the guidance and control technology for shipborne fixed-wing unmanned aerial vehicle (UAV) during dynamic recovery. The guidance system for precise recovery based on a segmented control strategy is proposed. The scheme design and integration test of the system for dynamic net-r...

To enhance the frequency modulation radio fuze’s ability to prevent interference in the complex electromagnetic environment, a method of classifying and identifying the target and interference signals is suggested. This method is based on the sparse representation theory and uses the sparse represen...

In view of the different types of jamming faced by satellite communication, frequency-shift keying (FSK) modulated communication signal was taken as the research object, and the relationship between the bit error rate and the signal-to-jamming ratio was mainly studied under the nine countermeasure c...

Parameter fitting was done using tests for the cohesive model, the normalized fatigue life model, the stiffness degradation model of the unidirectional laminate, and carbon fiber reinforced polymer (CFRP) flat-joggle-flat (FJF) bonded joint. Based on the models mentioned above, the fatigue life of t...

The variable camber technology can adaptively improve the aerodynamic performance of the aircraft, so combining it with the blended wing body (BWB) configuration can further exert its aerodynamic advantages. However, the tailless BWB only uses the trailing edge flap surface for trimming, with a shor...

Numerical calculation is an important tool for analyzing geotechnical engineering problems, and the accurate and efficient application of the unified hardening (UH) model in numerical calculation of geotechnical engineering is of great value. The superiority of the UH model in theoretical inheritanc...

The kinetic Boltzmann-Rykov model is used to explore the influence of rotating non-equilibrium on the inner flow of the nozzle, based on the computing principle of the gas-kinetic unified algorithm (GKUA). Mathematical models for the boundary conditions of nozzle flows were developed under the level...

A reducer is a typical hysteresis system, and the hysteresis affects its transmission performance. The existing hysteresis models of reducers usually ignore the hysteresis characteristics of geometric errors and treat them as constants, which results in the inability of these models to fully reflect...

It is a major problem for the aircraft environmental control system (ECS) design and improvement when encountering failures during dynamic operation. The traditional ground test equipment for the ECS only can supply gas in a steady state or a small range at a low speed, and it is difficult to reprod...

Mental fatigue is an important factor affecting human cognitive function and work efficiency, but there is no publicly available multi-modal fusion database related to mental fatigue, and the EEG signals commonly used to identify mental fatigue are prone to burden and activity limitation during the ...

High spatial resolution can be achieved by the satellite formation-based passive interference imaging system in space, however the retrieved image may contain aliasing noise due to sparse detection baselines, which will impede the detection of single-pixel point targets. Considering the slow-varying...

Tunnel crossing problem is unavoidable in the development of the topic crawler. To solve this problem, a self-decision topic crawler algorithm based on Boyd loop (FCIDOL) was proposed. The algorithm took the Boyd loop as the basic framework and formed a closed loop according to the principle of “obs...

The use of elastic instability to improve the performance of bionic soft robots is getting more and more attention. In this paper, a pre-curved spiral wound pneumatic soft gripper with a monostable structure was designed, which consisted of a strain-limiting layer and a fast pneumatic grid channel l...

The diagnosis of pulsatile tinnitus (PT) typically relies on medical imaging tests. However, due to the wide range of possible causes, there is still a lack of universally accepted diagnostic criteria with a clearly defined mechanism. This study aims to propose a neural network model for high-accura...

The generalized oblique projection filter has a “blind area of filtering” and is easily influenced by the estimation error of the noise covariance matrix in different noise backgrounds. To address these issues, a generalized oblique projection polarization-spatial domain joint filtering method based...

The research on radio frequency fingerprint identification (RFFI) of radiation sources is usually regarded as a typical closed-set classification problem. However, in the non-cooperative space, the radiation sources are unknown, so the closed-set classification algorithm is inapplicable. To solve th...

To address the problem that individual unmanned aerial vehicle (UAV) in under-actuated multi-UAV inclusion control cannot obtain global information and is subject to unknown external perturbations, making it difficult to converge quickly, this paper proposed a distributed fixed-time control strategy...

The non-holonomic constraint (NHC) of vehicle motion can be used as the velocity observation information for the vehicle-integrated navigation system, which can effectively suppress the error accumulation of the inertial navigation system (INS). To fully exert the constraint function of NHC, it is s...

The causes of two wavy tracks were examined in light of the phenomenon of aircraft moving forward in a wavy mode during terrain following flight with the adaptive angle method under the condition of a small field of view. An improved adaptive angle method formula was also proposed when terrain infor...

This work suggests a multi-scale real-time image fusion model based on nest connection, which aims to address the issues of lengthy running times, unnatural fusion strategies, and the incapacity to extract multi-scale deep features in existing infrared and visible image fusion approaches. Firstly, m...

In order to accurately evaluate the reliability of the servo drive unit of a computer numerical control (CNC) system, a reliability modeling method with multi-stage degradation data fusion was proposed. Firstly, by analyzing multiple degradation process models, random effects were introduced, and a ...