Beidou B3I signal, a new generation of civil code, has a higher rate and narrower chip width compared with B1I signal. Currently,there are few studies on the retrieval of sea surface height from B3I signals by using the Beidou reflected signal (BDS-R) technology and no relevant experimental results ...

The gaseous pollutants get into the cabin by the engine bleeding air system when the plane is waiting for taking off on the apron. However, the cabin air conditioning wind speed is constant, and the removal efficiency of the bleeding gaseous pollutants is low. To solve this problem, the Boeing737 ca...

Large inertia, a high center of mass, and time-varying friction are aspects of the aircraft towing process that have a significant impact on the stability of the aircraft tug. In order to improve the stability of the electric aircraft tug, the variable speed and torque that affect the stability of a...

Mobile robots to localize themselves is a prerequisite for full ego-motion. Simultaneous localization and mapping (SLAM), a key localization technology, has gained a lot of attention. An inertial measurement unit (IMU) is widely used in SLAM systems for its advantage of not being affected by the ext...

The ballistic coefficient is an important source of error in the orbit prediction of non-cooperative targets. For a large number of non-cooperative targets, calculating quickly the ballistic coefficient with the limited measurement and control resources is an urgent need. In this paper, based on the...

Accurate flight delay prediction is one of the most important preventive measures for the increasingly frequent airport flight delays. The airport network is transformed from irregular topological structure to regular network structure by spectral convolution. The graph convolutional network (GCN) a...

The autonomous orbit determination method based on remote sensing image has the problems of image mismatch and slow matching speed. Based on ontology knowledge base theory, this paper proposes an intelligent reasoning method for improving the effectiveness of remote sensing image. Firstly, the remot...

To solve the anisotropic problem of laser additive manufacturing components, the propagation characteristics of ultrasonic wave in the anisotropic material have been researched and the total focusing method using an ultrasonic array has been optimized based on group velocity of anisotropic material....

Airborne pseudolite navigation systems depend on geometry configuration, however previous research on how to create the ideal geometry configuration with the least amount of energy was limited. To solve this problem, the path planning algorithm of airborne pseudolite installed on stratospheric airsh...

A wind tunnel device simulating Herbst maneuver and the related motion/flow synchronous measurement technology are developed. By the device, the roll oscillation of the chined-body configuration undergoing the Herbst maneuver is studied. The device is used to study the roll oscillation of the chined...

Aiming at the difference of hydroplaning behavior characteristics of aircraft wheel group during different taxiing processes and under various accumulated water conditions, the additional resistance of accumulated water is studied in this paper. The critical judgment index of hydroplaning traditiona...

To understand the cooling heat transfer problem in air-kerosene heat exchangers, numerical study on the heat transfer of supercritical RP-3 aviation kerosene in vertical helical tubes has been conducted. The heat transfer characteristics and mechanisms under different operating parameters and struct...

The path planning in an unknown wind field is the main application challenge for stratospheric aerostats, which are a crucial platform for exploring the region of near space. The research object of this paper is stratospheric aerostat with certain horizontal actuation which are encountered with low ...

The crisscross heat pipe network was designed to convert the point heat source into a surface heat source in order to meet the heat rejection of multiple heat sources, high power dissipation, and large power density of the satellite phased array antennas, consisting of external heat pipes and embedd...

A new combustion diagnosis and measurement technology should be developed in order to realize the collaborative reconstruction of multiple physical parameter fields, such as the three-dimensional temperature field, the radiation physical property field, and the component concentration field of the g...

In order to avoid discretizing the whole structure and reduce the error between the geometric model and the discrete model, a shape optimization method based on the flower pollination algorithm and isogeometric boundary element method is proposed. The boundary element method only needs to discretize...

In order to investigate the joint influence of the fan and the core on the aerodynamic characteristics of the cruise, this paper takes a 350-seat blended-wing-body aircraft as the object of study, using the method of first changing the spanwise position of the core and, on this basis, later changing...

Aiming at the problems of slow diagnostic speed and difficulty in pardmeter selection in artifical intelligence algorithms currently used in fault diagnosis of aviation generator rotating rectifiers, an extreme learning machine (SSA-ELM) and complementary ensemble empirical mode decomposition (CEEMD...

To achieve accurate and continuous pedestrian positioning in complex indoor environments, we propose a multi-source fusion positioning algorithm based on hierarchical optimization is proposed. First, the geomagnetic matching range is constrained with the Wi-Fi positioning result. Afterwards, particl...

In order to evaluate the mental workload of pilots in flight task, a quantitative evaluation model of mental workload based on task demand load (TDL) and staff workload capacity (SWC) was established. Based on this, the evaluation methods of surplus mental workload (SMWL) and occupancy rate of mwl (...

Mixed polarity Reed-Muller (MPRM) circuit area optimization has become a research hotspot in the field of integrated circuit design. It is a combinatorial optimization, aiming at finding the MPRM expression with the least number of terms among many MPRM expressions. A explosion strategy and restart ...

This paper addresses the problem of the fast time-varying mismatch disturbance and measurement noise that inevitably exist in actual control systems, proposing a backstepping disturbance rejection control method based on the bi-bandwidth extended state observer (BESO). The BESO adjusts the bandwidth...

Aiming at the characteristics of high power density, complex working conditions, high integration of components and the wide variety of faults of electro hydrostatic actuator (EHA), a fault diagnosis and fault-tolerant controller of electro-hydro actuator based on an adaptive neural network robust o...

Abstract: Aiming at the flight control problem of proximity spacecraft formation near the artificial L1point of the sun-earth system, a hybrid propulsion control method combining solar sail propulsion and Coulomb force formation technology is proposed. By controlling the relative attitude angles of ...

The classic anti-jamming algorithm will null mismatch in the high-dynamic scene where the jamming source moves quickly in relation to the anti-jamming antenna, resulting in the failure of anti-jamming performance. Therefore, this paper proposed a polarization space-time multi-dimensional domain join...

The performance degradation of bolted joints is a problem which should be considered for the safety of aero-engine. The concept of preload mistuning of bolted joints can characterize the performance degradation, and the preload mistuning amplitude and the preload mistuning ratio are used to illustra...