The underwater imaging environment is complex, and the application of conventional target detection algorithms to has yet provide satisfactory results. Therefore, optical image remains one most challenging tasks involved with neighborhood-based techniques in field computer vision. Small targets, dispersion, sources distortion (such as sediment particles) often render insufficient, existing primarily focus on improving accuracy enhancing algorithm complexity computing power. However,...

This paper presents a nonsingular terminal sliding mode and active disturbance rejection decoupling control (NTSM-ADRDC) scheme for the three-dimensional (3D) trajectory tracking of autonomous underwater vehicles (AUV). Firstly, AUV model is decoupled into five independent single input–single output (SISO) channels using ADRDC technology. Secondly, NTSM-ADRDC controller designed. The linear extended state observer (LESO) used to observe variables, estimate total system. In addition, improve...

Considering the actual situation of time-varying interference in underwater environment, a trajectory tracking control method for an underactuated Unmanned Underwater Vehicle (UUV) exploration based on backstepping sliding mode with fuzzy switching gain is designed this paper. Firstly, motion equations UUV diving plane are given. Secondly, virtual variable to replace pitch angle avoid singular value phenomenon. Combining technique, controller proposed. Thirdly, order decrease chattering...

In addition to the target echo, signal environment of secondary surveillance radar (SSR) also includes environmental echo and noise interference, which greatly affect correct decoding response signal. Nowadays, processing signals basically uses traditional methods, there are few methods for denoising using deep learning neural networks. This paper proposes a method based on residual separable network (DRS-Net), can effectively extract features predict original The core is convolutional...

In order to remove the complex and severe noise from sonar image more effectively, an denoising approach based on sparse representation is carried out in this paper. To decompose then reconstruct DCT dictionary with OMP effective for additive removing. Then a logarithmic transformation was applied previous reconstructed make it adapt model. Experiments are provided demonstrate performance of proposed approach. Results show that method efficient removing multiplicative also particularly...

Integrated pressurized water reactor (IPWR) usually be equipped with once-through steam generators (OTSGs). The OTSG has many advantages such as simple mechanical structure, smaller size, and higher heat transfer efficiency. It produces superheated but less inventory in its secondary side. pressure is easily affected by flow rate or feed rate. This draws more attention to design advanced control system. In this paper, a study been carried out analyze the thermal hydraulic performance of an...

This paper presents a relaxed stabilization condition for polynomial-fuzzy-model-based control system by using sum-of-squares (SOS) approach. Full-block S-procedure is utilized to equivalently decouple the fuzzy weighting constraint into two constraints, which can be computed directly with SOS Besides, free full-block multiplier imposed this procedure also contributes reducing conservativeness of stability analysis. The copositivity verification relaxation performed on...

We propose a consensus control strategy for multiple unmanned underwater vehicles (multi-UUVs) with unmeasurable disturbances under the fixed and switching topologies. The current methods presented in literature mainly solve tracking problems time-invariant time-varying topologies, respectively. In paper, considering complex nonlinear couple model of UUV, technique feedback linearization is employed to transform UUV into second-order integral model. For consisting unknown uncertainties...

Information fusion is one of the key technologies in airborne multisource navigation, where federated filter widely used due to its simple structure. However, sensor measurement navigation system will become unreliable some interferential environment, which leads state and noise covariance matrix (MNCM) change over time estimate difficultly. Inaccurate matrices cause loss positioning accuracy traditional filter. To address problems, this article puts forward an adaptive federal Kalman...

The limited communication consensus control problem is studied for leader-following multi-UUVs (multiple unmanned underwater vehicles) in a swarm system that contains multiple secondorder UUVs with the time-varying delay. multi-UUV will be divided into many sub-groups each includes one leader and follower UUVs, leaders-group composed of all leaders sub-groups. In leaders-group, called commander, follow commander. Under mechanism, multi-independent switching topologies are proposed hybrid...