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Digital phase shifter is widely used to achieve space scanning in phased array antenna. The quantization error will produce for discontinuous phase shifting of digital phase shifter. This paper introduces an approximate formula, derived by adding sub-array virtual elements and using the principle of pattern multiplication, about beam pointing accuracy of uniform linear array in condition of phase...
Gas sensor array is an important part of electronic nose. The recognition ability of electronic nose is affected by the cross sensitivity of gas sensor array. We propose a pattern recognition method for electronic nose by combined use of kernel independent component analysis (KICA) and least squares support vector machine (LS-SVM) in this paper. In the proposed method, the KICA algorithm based on...
It has great significance that monitoring temperature and pressure of reactor in chemical experiments and industrial production. In this paper, computer and intelligence instrument are connected by field bus into a small distributed control system, than, develop the on-line monitoring software for reactor based on LabVIEW platform, It has data collection, display, storage and analysis functions, and...
Virtual Array Transformation of DOA Algorithm is widely used in actual engineering DOA estimation of the uniform linear array (ULA) of spacing of array elements greater than half a wavelength or any non-uniform linear array (NULA). However, when virtual array is transformed, if there is a signal outside the current transformation sensor, a serious impact will be had on virtual array DOA estimation...
A multi-agent Immune-based Co-Taboo Search Algorithm is proposed to reconfigure distribution network with loss minimization. When the population is initialized, the approach of co-taboo search is applied to seek out initial solutions, and the radial structure constraint ensures initial solutions to be feasibility. So the avoiding of unfeasible solutions greatly reduces the search space, and the search...
Aiming at especial instance of UV curing for highspeed revolving object, study on more application of UV LED is carried and a new scheme to fanlike UV LED array with lens is brought forward, and gradually increasing radiant incidence and uniform radiant dose along radius are received by this array. Optical simulation is carried through on Tracepro and result shows that technical problem on fast and...
A system scheme of the stand-alone photovoltaic inverter based on parallel charge topology for the purpose of improving the energy conversion efficiency and optimizing the battery management was introduced. A novel circuit topology of the DC-AC inverter with the soft switching property using IGBTs and MOSFETs was presented. A modified P&O algorithm for better tracking performance with adaptive...
We proposed a fast secret image sharing based on Haar wavelet transform and Shamir's method. Many researchers develop secret image sharing method with Shamir's algorithm in one whole image. We employ discrete Haar wavelet transform to reduce the secret image to its quarter size firstly, i.e. the 1-level LL subband. Then only apply the modified Shamir's algorithm to this LL subband to generate the...
PV array output power is a nonlinear function of the external environment and the load, in order to give full playing to the performance of photovoltaic array, maximum power point tracking (Maximum Power Point Tracking, referred to as MPPT) control adjust the disturbance of accounting space based on the work of photovoltaic arrays. Although the existing variable step size control has a better ability...
Based on the distinguishing characteristics of the output current and voltage for photovoltaic array working in different states, a novel voltage and current detection method was proposed in this paper compared to the original current and voltage method. Of this method, the fault position can be located precisely and quickly by analyzing the current and voltage variation of each branch, according...
This paper presents a low-power embedded EEPROM in a short-range passive RFID tag. This tag was designed according to ISO/IEC 15693 protocol. An improved structure of array circuit is proposed which can reduce leakage of memory bit cell efficiently. The proposed circuits can reduce maximum to 8μA per bit cell. A new RFID EEPROM timing design and its optimized control circuit are developed. The fabrication...
It is an essential requirement to realize single-station passive location of emitter target in the modern electronic warfare and information warfare. Single-station passive location system has vast application prospect, because of its properties of flexible, convenient, high concealing, far detection range and other advantages. This paper introduces a kind of single-station passive location method...
In this paper, a multi-band flat two element array smart antenna with compact size for mobile phone is proposed. The antenna is composed of a two element array antenna; the dimension of the proposed antenna element is only 28mm (length), 11mm (height), 0.1mm (thickness). Some important parts of radiation performance such as a LCD module, a PCB, antenna feed area, key board and EMI sheet are finely...
A test system with the CCD matrix and computer is researched to realize 2-D non-contact and automatic measurement. Micro-size rectangle work-piece is tested as example. The experiments show that the absolute precision is less than 3 μm. The instrument possesses the high accuracy and good repeatability, the system may be used in the product line and makes on line testing possible.
The output of photovoltaic array has several corresponding local peaks of power-voltage curve with the existence of the shadow, In order to make the photovoltaic arrays continue to work in the maximum power point, need to create conditions for the model of the PV array, On the basis of the model, there are having some further detailed analysis and research about the characters of the local photovoltaic...
The service quality of power-supplying enterprises has blocked its long-term development after the question of power-lack had been settled ultimately. In the paper, the author analyzed the necessity that the Power-supplying Enterprise should build voluntary service idea and improve service quality. According to the fact of the power-supplying enterprises, the author used the method of SERVQUAL to...
The work cycle of modern radar is shorter and shorter, furthermore, the volume of data that need to be processed becomes larger and larger in a period. It is very difficult for the computer to real-time process large amounts of data and to real-time control radar. This paper proposes designing an FPGA-based co-controller between the computer and radar subsystems, in order to realize the real-time...
A multi-FPGA signal processor is proposed for implementing the signal processing of underwater 3-D imaging sonar systems. The processing element of the system architecture is FPGA, and the beamforming algorithm of 3-D imaging sonar is implemented in the multi-stage parallel distributive steps. The FPGAs are connected using Low Voltage Differential Signaling (LVDS), which is in user defined protocol...
The working principle of the single-phase full bridge inverter and the produced method of third-order SPWM wave are discussed. The design process of realizing SPWM based on FPGA (field programmable gates array) is presented. By using the high speed FPGA, the switch frequency of the inverter is increased, and the harmonic content of the output sine wave is reduced. Simulation and experimental results...
While the high-precision simulation is widely used in science and technology, Design of Experiment (DOE) based on Response Surface (RS) method can be employed in surrogate model to reduce the cost and error. In order to illustrate the relationship between parameters and response features, several DOE methods and Response Surface (RS) method are studied. The author used polynomial regression and RBF...
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