Passive synthetic aperture (PSA) is recently used in passive localization, due to its high precision and resolution. However, the unknown parameters of radiation sources will cause Doppler signal distort, which affect localization accuracy. To solve problem, this article proposes a algorithm based on range migration difference (RMD) nonuniform fast Fourier transform (NUFFT) for pulse repetition interval (PRI)-staggered radar signal. The main idea use RMD compensate PRI estimation errors,...

Passive localization is important because of its strong concealment and long detection distance. Space-borne passive radiation source location technologies have contradicting characteristics wide coverage high-precision position. Hence, accurate target identification difficult to realize. A novel measurement that utilizes synthetic aperture presented in this letter measure the time satellite's passing zenith precisely. In beam duration, carrier Doppler component extracted accumulated...

Emitter localization is an active research topic in electronic reconnaissance. Recently, passive synthetic aperture (PSA) has been used to determine the azimuth and range distance of emitter. However, existing methods approximate equation spaceborne model through airborne model, resulting a large positioning error. In this article, emitter algorithm based on PSA proposed. First, phase received signal accumulated by using symmetry Doppler history long time, improving accuracy. The effective...

A novel method employing an ESPRIT and Kalman filter is proposed for the one-dimensional direction finding problem of MIMO radar. The rotational invariance among multiple equivalent virtual subarrays radar exploited to derive estimates each target through ESPRIT. are fused a refine accuracy estimation. Numerical examples demonstrate effectiveness method.

Abstract Chinese universities have the characteristics of a dense population and high per capita energy consumption. Quantitative analysis campus carbon emissions, research on exploring potential for emission reduction become effective paths universities. Taking university in Shanghai as an example, based set organizational boundaries, sources are determined classified, most suitable factors selected them. Activity data relevant is collected through on-site research, factor method used...

In this study, a new moving amplification matching algorithm was proposed, and then the temporal spatial differences correlation were analysed evaluated by comparing FengYun-4A Lightning Mapping Imager (FY-4A LMI) data China Meteorological Administration Detection Network Advanced TOA Direction (CMA-LDN ADTD) system of southwest in July 2018. The results are as follows. Firstly, could effectively reduce number invalid operations save operation time comparison to conventional ergodic...

A new joint processing method based on covariance matrix fitting is presented for the multibaseline synthetic aperture radar interferometry. This can make full use of interferometric information embedded in to estimate terrain height without eigendecomposition and eigenspace division, insensitive rank variation signal subspace. By sample tapered with coherence matrix, this work robustly a finite support, which also makes it possible recover detail profile small neighbouring support. The...

As one of the largest coastal wetlands in northern China, ecological function Caofeidian wetland has gradually degraded due to influence climate and surrounding environment.In order regulate repair water area wetland, it is necessary study analyse historical changes influencing factors This paper extracts Wetland 1984~2013 from images collected by Landsat satellites using normalized difference index (NDWI), analyzes causes variation according data Meteorological Station Tangshan Statistical...

The tunneling total load is one of the core control parameters for safe and efficient construction using machines. However, because process involves complex coupling relationships between equipment local geology, theoretical derivation difficult. development data detection acquisition technology has led to extensive modeling based on analysis machine learning. it difficult obtain an explicit interpretable model that satisfies certain physical rules. In this paper, a method symbolic...

In water flooding oilfield, petroleum production is the most crucial target for production-injection wells system. An effective, informative and accurate prediction facilitates parameter adjustment, optimization, fault analysis decrease in cost. Some effective Artificial Intelligence (AI) technologies have been widely used various kinds of industrial fields including manufacturing, building, chemistry medicine. this paper, AI based on least squares support vector machine (LSSVM) optimized by...

Recently, the passive synthetic aperture (PSA) technique has been used in localization to improve position accuracy of single source by estimating Doppler parameter received signal. However, presence multiple sources, time-frequency aliasing will lead serious cross-term interference during signal extraction, resulting low performance. To solve this problem, a spaceborne algorithm based on multiple-stay detector HOUGH transform (MSD-HOUGH) is proposed paper. Firstly, an improved convolutional...

Large and complex buildings built in China recent years, such as Olympic venues, airports, large hospitals, have brought new fire evacuation problems. Many designs are using Internet of Things (IoT) technology to enhance buildings' perception flames smoke. In this paper, addition IoT improve the fire-awareness buildings, a set algorithms based on Dijkstra's shortest path method is designed operate local FPGA edge computing terminal determine current optimal path. An system with an lighting...

Sphere target is an important toolbox in terrestrial laser scanning. With the sphere target, multiple point clouds data obtained from different views can be transformed into same coordinate frame. Determination of center key to complete task mentioned above. A usual approach determine coordinates Less Squares (LS) method. In this paper, a new method using Total Least (TLS) investigated. For method, special model assumed that design matrix contains linearization, and errors both residuals...

Wireless in-body sensor networks are attracting increasing attention for numerous healthcare applications and medical services. Implant devices widely employed to measure physiological signals inside the human body in a simple, long lifetime continuous approach. However, due strict technical requirements of implant devices, there exist key research challenges this area. Considering realistic transmission power based on IEEE 802.15.6 standard safety regulations, channel characteristics deep...

Two-dimensional principal component analysis (2DPCA) has been widely used to extract image features. As opposed PCA, 2DPCA directly treats 2D matrices features instead of transforming into vectors. However, the classical based on <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$F$ </tex-math></inline-formula> -norm square is sensitive noise. To handle this problem, 2DPCAs notation="LaTeX">$\ell _{1}$ -norm,...

This paper presents a new ceiling antenna optimised by applying differential evolution (DE) and fabricated 3D printing. The frequency band of the ranges from 0.75 GHz to 3 GHz. geometric structure refers volcano smoke antenna, which contains teardrop as radiating element curved ground plane. Curves in are determined cubic spline interpolation function. design problem is converted into constrained optimisation (COP), solved DE next. Some antennas found, one them presented this paper. measured...

Emitter localization has been an active research subject in electronic reconnaissance, target tracking, emergency response, and satellite interference source localization. Recently, researchers applied passive synthetic aperture the emitter to improve positioning accuracy. Passive uses Doppler rate zero point range azimuth locations, respectively. In spaceborne model, effective velocity is used equation fit model. Therefore, this study proposed a convex optimization approach calculate...

Controlling tiny objects by acoustic vibration is a new non-invasive and non-contact control method. Its of has great advantages in many applications biology, chemistry, engineering physics. The current research generally to observe the impact on objects, but method controlling movement still traditional This paper mainly uses reinforcement learning object movement, which can optimize effect. In this paper, system for motion through designed displacement algorithm based Deep Q Network(DQN)...

This paper presents a new ceiling antenna optimised by applying differential evolution (DE) and fabricated 3D printing. The frequency band of the ranges from 0.75 GHz to 3 GHz. geometric structure refers volcano smoke antenna, which contains teardrop as radiating element curved ground plane. Curves in are determined cubic spline interpolation function. design problem is converted into constrained optimisation (COP), solved DE next. Some antennas found, one them presented this paper. measured...