An effective on-board cloud detection method in small satellites would greatly improve the downlink data transmission efficiency and reduce memory cost. In this paper, an ensemble combining a lightweight U-Net with wavelet image compression is proposed evaluated. The red, green, blue infrared waveband images from Landsat-8 dataset are trained tested to estimate performance of method. LeGall-5/3 transform applied on accelerate neural network feasibility implement. experiment results...

A current sensor based global maximum power point tracking (GMPPT) algorithm of photovoltaic system is proposed in this article to increase the speed during partial shading condition. For algorithm, range duty cycle reduced by calculating both upper limit and lower skipping section without point. Compared with trapezium (MPT) combination MPT search-skip-judge, reduces directions only needs one realize control. As a result, shows advantages fast speed, small energy loss, low hardware cost....

As an important neurotropic enterovirus, enterovirus 71 (EV71) is occasionally associated with severe neurological diseases and high mortality rates in infants young children. Understanding the interaction between host factors EV71 will play a vital role developing antivirals optimizing vaccines. Here, we performed genome-wide CRISPR-Cas9 knockout screen revealed that scavenger receptor class B member 2 (SCARB2), solute carrier family 35 B2 (SLC35B2), beta-1,3-glucuronyltransferase 3...

In order to enhance the efficiency of image transmission system and robustness optical imaging Association Sino-Russian Technical Universities satellite, a new framework on-board cloud detection by utilizing lightweight U-Net JPEG compression strategy is described. this method, careful introduced evaluated acquire balanced result between power consuming. A deep-learning network combined with Mobilenet trained verified public Landsat-8 data set Spatial Procedures for Automated Removal Cloud...

High-resolution satellite images (HRSIs) obtained from onboard linear array cameras suffer geometric disturbance in the presence of attitude jitter. Therefore, detection and compensation jitter are crucial to reduce geopositioning error improve accuracy HRSIs. In this work, a generative adversarial network (GAN) architecture is proposed automatically learn correct deformed scene features single remote sensing image. GAN, convolutional neural (CNN) designed discriminate inputs, another CNN...

Recent researches on hypersonic vehicles adopted in military have gained a lot of interest because its high flight speed and efficiency. However the guidance laws for missiles against anti-missile system to increase survivability defense penetration ability are still need study. One main countermeasure deal with this issue is implement simultaneous attack. Therefore paper an impact-time-control law impact stationary target at same desired final time presented. Time-to-go estimation...

This paper designs a project to observe dangerous space debris via space-based inverse synthetic aperture radar (ISAR) imaging techniques. The represents orbital difference observation method deal with capacious special exploration difficulties, specific task analyze, feasibility demonstration and parameters setting combined ISAR theories. Moreover, it shows simulation results propose intercross algorithm obtain precise position of debris. Finally, an overview the system's virtue demerit is given.

In this paper, physical optical (PO) method is introduced and applied to calculate the echo data from a missile illuminated by plane waves with arbitrary aspects different frequencies for inverse synthetic aperture radar (ISAR) imaging. The approximated component disassembly (CMD) concept of scattering matrix in order simplify complexity numerical calculation. Generated images several incidence angles are analyzed signal processing theory can precisely represent mirror region rotation...

In this paper, we focus on solving the problems of inertia-free attitude tracking control for spacecraft subject to external disturbance, unknown inertial parameters, and actuator faults. The robust architecture is designed by using rotation matrix neural networks. presence disturbance parametric uncertainties, a fault-tolerant (FTC) scheme synthesized with minimum-learning-parameter (MLP) algorithm proposed improve reliability system when faults occur. These methods are developed based...

With the expansion of civil UAV (Unmanned Aerial Vehicle) market, UAVs are also increasingly being used in illegal activities such as espionage and snooping on privacy. Therefore, how to effectively control cities has become an urgent problem be solved. Considering urban background radar performance communication signals, a low-altitude target detection scheme based 5G base stations is proposed this paper. A signal external radiation source, method transceiver separation adopted,...

Multipath effects are investigated on inverse synthetic aperture radar (ISAR) image reconstruction of ships with rectilinear motion in different sea state. First, the generalized problems multipath propagation application formulated. After a brief review ISAR imaging principles, theoretically analyzed and point spread function (PSF) is defined, two artifacts intensities shifts generated images introduced by effects, moreover, range-Doppler algorithms used to give more clear direct...

Reliability and validity have always been the most important criteria in micro-satellite designing. Beside this, other factors such as miniaturization, fault tolerance, data rate, redundancy power consumption should also be fulfilled by satellite systems. The limitation to reliability is interdependent links of subsystem wiring harness connectors. physical lead potential risk damages, weight bus systems together with connectors distribution lines almost occupy 10% dry mass a micro-satellite....

This paper presents the application of emulated bistatic radar (EBR) geometries to 3D interferometric inverse synthetic aperture (In-ISAR) imaging techniques. The EBR is introduced into height estimation a target in order reduce expenses and complexity associated with standard processing systems, while In-ISAR technique reformulated incorporate an configuration. Simulation results show that theoretical analysis correct algorithm effective

Both Global Navigation Satellite Systems and X-ray pulsar-based navigation system use relative position information to provide accurate spacecraft navigation. To supplement that information, an absolute reference from other types of measurements should be provided; however, may increase the complexity or decrease autonomy system. overcome those drawbacks, this paper proposes initial orbit determination method using only increment their corresponding epoch. The proposed can summarised as...

When radar illuminates targets at low elevation angles, returns will change due to multipath interference. For inverse synthetic aperture (ISAR), the effects introduce two artifacts in its reconstructed images, which greatly hinder target recognition and classification. A novel technique requiring no apriori knowledge of motion parameters is developed this paper for cancellation ISAR image reconstruction. This based on a parametric estimation method using two-dimensional entropy as cost...

Based on the General Cell concept, proposed a satellite system which integrated on-board computer, attitude and orbit control TT&C into an electronic system, had carried out In-orbit test Test Satellite III. The composition mainly includes processor unit RF unit. This scheme adopts embedded systems technology, SoC technology RFIC as core of composed system. use multi-processor have enhanced computing management ability to manage measurement through CAN bus accomplish calculation, LNA PA...