Satellite autonomous navigation based on landmark information can be used for all kinds of satellites which can periodically obtain images of earth surface for its high accuracy and independence. This method has been restricted by landmark selection method and the establishment strategy of landmark ...

A parallel micro-positioning platform with folded beams was designed, which has characteristics of large stroke and low resistance. Stiffness was solved by transfer matrix method. First, transfer matrix of flexible subunit was established. The transitivity characteristics became available by taking ...

Under the condition of multimodal travel choices in large cities, there is a close relationship of traffic demands among subway, buses and private cars. In order to explore the coupling relationship and time-varying feature among multimodal traffic demands, with road congestion index representing th...

Topographic correction is critical to the accuracy of the earth's surface quantitative remote sensing. Traditional topographic corrective models are not so suitable for high-resolution remote sensing images. In order to address the problem, this paper proposes a topographic correction method based o...

Atomic spin gyroscope is the latest type of gyroscope, which has ultra-high theoretical precision. Alkali vapor cell is the sensing element of atomic spin gyroscope, which carries the atomic spin effect. Electric heating makes alkali attain saturated vapor pressure, which will introduce electromagne...

Recently the avionics system is quickly transferring to integrated modular architecture. To prevent the mutual interference between different applications, IMA software usually adopts partition mechanism. Due to the "time partition", the traditional real-time schedulability analytical method is not ...

The maximum forward speed for helicopter increases by adopting rigid coaxial rotor system, while the vibration load in rotor system obviously increases. In order to analyze the vibration characteristics of high-speed rigid coaxial rotor system, it is necessary to investigate unsteady aerodynamic loa...

Land clutter power exerts a strong impact on the performance of low-altitude surveillance radar. Especially in urban areas, skyscrapers and atmosphere conditions complicate the radar signal propagation and the electromagnetic scattering from land surfaces. This paper presents a land clutter power ma...

Nacelle design has a significant effect on aerodynamic performance of blended-wing-body (BWB) aircraft with distributed propulsion. To clarify the effect and its reason of primary nacelle design parameters on aerodynamic performance of BWB aircraft with boundary layer ingestion (BLI) effect, a detai...

Aimed at the problem that frequency-stepped synthetic aperture radar (SAR) images obtained by classic inverse Fourier transform method have a limit on unambiguous range, a new model which takes the pulse sequence of frequency-stepped SAR as an along-track virtual array radar signal and its correspon...

As flying wing UAV lacks manipulating ability, a control strategy combined with fluidic thrust vectoring-turbocharged engine (FTV-E) technology is proposed. In this paper, the control scheme is designed:the inner loop compensator is used to eliminate the negative coupling term of system; the outer l...

In order to study the progress of the cryogenic propellant during atmospheric ground parking, a visualization liquid nitrogen tank experiment system was designed. The experiment researched how the filling rate and ambient temperature affected the evaporation mass of liquid nitrogen, and measured the...

Global navigation satellite system-reflectometry (GNSS-R) is a new remote sensing way which is passive radar and could be used to improve the retrieval precision of the sea surface salinity (SSS). The model of brightness temperature and the scattering power model of GNSS-R were reviewed, and the spa...

Financial fraud behavior, network intrusion and suspicious social actions can be detected by structural anomaly detection in graphs. The existing anomaly detection algorithms require high computational complexity and cannot process large-scale dynamic graphs. So an incremental and parallel algorithm...

In the application of global navigation satellite system-reflection(GNSS-R) technology, the GNSS-R signal simulator is needed to test the reflection signal receiver in order to reduce costs. A modeling method of global navigation satellite system (GNSS) sea surface reflection signal based on the pri...

Error correcting output codes (ECOC) is a decomposition framework, which can transform a complex multiclass classification problem into a series of two-class classification problems. It can complete one multiclass classification task efficiently. To improve its generalization performance, we studied...

Fiber metal laminates, as a new-type composite material, have been applied in aerospace field. Digital optical strain method is used to realize strain measurement of metal layer instead of traditional method of strain measurement. Meanwhile, in order to predict the stress distribution in metal layer...

A novel object tracking algorithm based on convolution representation in Fourier domain is proposed for object tracking. Object tracking question can be treated as a convolution representation model. By finding the best filters, which reconstruct the target function with minimum loss, fast and robus...

In order to obtain a more realistic mesoscopic analysis model of closed-cell aluminum foam, a new methodology for the finite element modeling based on computed tomography (CT) images is presented. First, the optimal threshold between base material and air was developed using Otsu algorithm by analyz...

Recovering pulse template is one key technology of X-ray pulsar-based navigation system. Its precision is closely related to the pulsar angular position. First, this paper briefly introduced the theory of recovering standard profile. Then, the impact of pulsar angular position error on pulse templat...

A new integrated navigation method based on inertial sensor, optical flow and visual odometry is proposed for self-navigation indoor in GPS-denied environment. An ORB optical flow based method is also proposed for estimating real-time three-axis velocity of the UAV. The algorithm improves the tradit...

Cracks often initiate at the chamfering for sagging holes. The initial fatigue quality (IFQ) of this type of crack needs to be determined prior to economic life assessment. Firstly, finite element models with and without chamfering are developed so as to investigate the effect of chamfering on the s...

In order to represent the movement of the shoulder skeletal system, a spatial hybrid mechanism model is proposed, which describes the articulation between the scapula and thorax as a kinematic constraint similar to a cylinder-plane pair. Firstly, types of joints in shoulder are determined, and thus ...

Cross entropy method is an efficient and adaptive stochastic optimization method and has immense potential in complex optimization problems with high dimension and nonlinear constraints. However, the traditional cross entropy method is lack of accuracy. In this study, both the concepts of current el...