Strong Anti-jamming Ability Research Articles

Intelligent Monitoring Water System by PLC (Power Line Carrier) and Wireless Communication

To saves water resources and low carbon environmental, we have designed a smart monitoring watering system based on power carrier and wireless communications, the system schema is divided into three layer, background server control the concentrated controller through wireless core network; each concentrated controller controls watering system through power carrier network; watering systems as the terminal access points of The Internet of Things , directly control the location regional's temperature, humidity and the soil situation, thereby achieved unmanned unattended, automatically watering. System integrates technology as wireless communications, power line carrier, single-chip microcomputer , application in LCD and so on, through hardware and software design, realizes data storage, the node information query, node failures and cable guard alarm function. Experimental results show that the overall system has low power consumption, high reliability, strong anti-jamming ability, so that it can better meet site's needs.

Multi Point Temperature Measurement System Based on DS18B20

In this design, AT89C51 microcontroller is as the core ; KEIL is as the system development platform; The C51 language is used to design program. Multi-point temperature measurement system is designed with the DS18B20 intelligent temperature sensor. Under the Proteus platform simulation, the data results of the system actual operation is analyzed.This design did not use DS18B20's usual 1-wire bus structure, but use the parallel port of 51 single-chip computer. At the same time the temperature of 4 DS18B20 sensors are fast read. Therefore,it realized rapid accurate recognition and processingin in multi-point temperature measurement system of multiple sensors,and this kind of distributed temperature measurement system interface is simple, high precision, strong anti-jamming ability , stable work etc..

Research On BD2/GPS Dual-mode Adaptive Anti-jamming Receiver

The robust of satellite navigation receiver in complex electromagnetic environment is very important in military application, so the key technology of BD2/GPS Dual-mode Adaptive Antijamming Receiver is proposed. Space-time nulling and digital beam-forming anti-jamming methods were analyzed, if the wave direction is known, digital beam-forming can get a stronger anti-jamming ability than space-time nulling. Receiver cannot get the direction of arrival wave in cold start mode, so a method use navigation satellite almanac and inertial navigation module to estimate the direction of arrival wave which can make receiver get stronger anti-jamming ability at initial start time. Simulation tests show that: the method let receiver using digital beam-forming at the start time increase the anti-jamming capability than the original receiver witch only starts with nulling technology.

Boiler Combustion System of Multivariable Internal Model Control Application Research

In the industrial process of common multivariable time delay input/output system, a multivariable decoupling internal model controller design method is put forward based on the internal model control structure, the method for the design of internal model controller has the function of decoupling and controller. The advantage has the ability to achieve approximate or complete decoupling in nominal system output response, the method is used on the multivariable strong coupling of the boiler combustion control system to design and simulation study, the simulation results prove the effectiveness of the method. And in the process model and process mismatch showed strong robustness and anti jamming ability.

Control Study of Precision Giant Magnetostrictive Actuator Based on Active Disturbance Rejection Control Technology

Introduce the structure and working principle of precision giant magnetostrictive actuator and establish the actuator system object transfer function model so as to design a suitable active disturbance rejection controller (ADRC). According to the model analysis, regard the actuator system as a first-order inertia object with dead time to construct second-order ADRC, use MATLAB for parameter tuning and put the parameters into the controller to conduct simulation experiment on the actuator system objects. Simulation results show that the ADRC constructed has good control effect and strong anti-jamming ability and the parameters have strong robustness.

An Attendence System Design Based on Wirless RFID

The attendence system uses RFID to realize practicable function for ground operation of coal industry. Each worker is given by a 2.4GHz passive RFID card in order to be recognised by the system. And technologies such as database, internet and microwave communication are combined with B/C structure, which enables the comsumer to manage and operate the system convenietly wherever has the access to the Internet. Also a UDP protocol applied here to make the communication effectivly and works fast. According to the applications among several coal industry enterprises, it indicates the system has the advantages such as user-friendly, fast communication, accurate data transfer, and strong anti-jamming ability etc.

Analysis and Identification of Cetacean Sounds Based on Time-Frequency Analysis

A set of sonar system depending on acoustic signal for communication, orientation estimate, and environment identification has been formed by cetacean in the long-term evolving process. Compared with human development of such system, bio-sonar system is characterized by stronger anti-jamming ability, higher precision, better capability of identification, etc. It has great significance to study, analyze and classify cetacean sounds, not only for the protection of halobios but also for the mystery of cetacean and the development of the bio-sonar. This paper expounds some general methods for monitoring cetacean, analyzing and summarizing the characteristics of cetacean acoustic signals based on timefrequency analysis, which lays the foundation for the recognition of cetacean acoustic signals. Finally, this paper introduces two category methods which often used during the process of cetacean acoustic signal recognition.

Research on Moving Human Positioning in Complex Background Video

Human Skin Color(HSC) features have been widely used in video moving human positioning. However, in complex background video sequences, due to illumination changes or other moving objects which have similar HSC regions, the effect of moving human positioning is not satisfactory. A new method of moving human positioning applied on complex background video sequences is presented in this paper. Firstly, brightness information of the video sequence images is detected and analyzed based on HSV color model. Secondly, adopt the multi frame subtraction method to extract the moving object regions from motionless background. Then, the regions with distinctive HSC features are separated from other moving objects using the data fusion model of HSC and brightness information. Finally, identify human object among regions with HSC features according to the prior knowledge of human. The experimental results show that the method provided in this paper is effective in moving human positioning of complex background video, and has the strong illumination change adaptability and anti-jamming ability.

Acoustic Source Localization Based on Generalized Cross-correlation Time-delay Estimation

In the existing acoustic emission (AE) localization methods, the estimation localization method based on the time difference of arrival (TDOA) has less computation and higher accuracy of positioning and is easy to implement the real-time systems and thus it becomes a commonly used method in the acoustic source localization methods. In this method, the most important thing is time delay estimation (TDE) that directly affects the accuracy of positioning. In this paper, we analyze the performance of several weighting functions in the generalized cross-correlation time-delay estimation algorithm and give the simulation results. By comparison, PHAT weighting is characterized by small fluctuations, sharp peak and strong anti-jamming ability and it is the best choice for acoustic source localization in the generalized cross-correlation time-delay estimation algorithm.

Design and Implementation of Hybrid Electric Vehicle Control System CAN Communication

Based on the vehicle CAN bus technology, with features of Hybrid Electric Vehicle (HEV) control network be concerned, CAN bus protocols of application layer suitable for HEV are developed in the paper. And control network is built based on multi-master CAN distributed control technology. Through CAN controller programming of DSP, supported by the corresponding external drive circuit, the motor controller nodes is connected with the vehicle CAN network. Finally the CAN Bus communication of HEV energy assembly control system is designed and realized. Experimental result indicates that the system works well with stable signal and strong anti-jamming ability, and the communication with HEV CAN bus is realized successfully.

Experimental Study on Measurement Method of Flow Electrification

When a relative motion occurring between liquid and solid, electric charges with opposite signs come out separately on each side by friction which phenomena is called flow electrification. As the amount of charge generated by flow electrification is small, and part of which neutralize each other at the same time, the test method of flow electrification becomes one of discussion topics for scientists of all countries. This paper introduces an experimental measurement method of flow electrification, which is a comparative method by inserting electrodes in pipelines, and acquisition amplifier circuit, with high resolution and strong anti-jamming ability. Experiments show that the measurement method could be applied to system testing for flow electrification.

Multi-objects colorful segmentation algorithm for complex background

The background modeling of multi-object segmentation of moving video relies much on the change of environment. Making use of the background subtraction directly may lead to unsatisfactory even wrong segmentation. An improved algorithm of the codebook background modeling based on Kalman filtering theory was proposed. According to the codebook,a colorful model for each pixel was built to distinguish the foreground and background pixels,and according to the characteristics of temporal recursive low passed of Kalman filtering,it was used to rectify the codebook background modeling. The experimental results show that the improved algorithm can update background model efficiently,has the strong anti-jamming ability and segregate the moving objects accurately to meet the real-time requirements.

Study on the Evaluation Model of Image Definition

At present, the usual image definition evaluation methods are poor in focusing precision and have a lot of calculations. In view of these problems, the paper analyzed the factors affecting an image quality evaluation, and proposed two evaluation models based on an image contrast change rate and an autocorrelation function. These methods avoided efficiently the phenomenon of partial peaks of focusing-function curves for noise disturbing. The stimulant test proves that the focusing curve of the evaluation model in the paper has many advantages, such as good focusing performance, strong antijamming ability, good real time and so on.

ITERATIVE SOLUTION TO THE NOTCHED WAVEFORM DESIGN IN COGNITIVE ULTRA-WIDEBAND RADIO SYSTEM

Cognitive Ultra Wideband Radio is proposed to exploit the advantages of combining Cognitive Radio with Ultra Wideband technologies, so as to solve the problems of coexistence and compatibility between UWB and other existing narrowband wireless systems. A novel adaptive UWB pulse shaping algorithm with low complexity, instead of notch filter, is presented for producing the expected spectral notches right in the frequency band occupied by the nearby wireless devices. Simulation results show that the proposed UWB waveform has better single-link BER performances in AWGN channel and stronger anti-jamming ability than other conventional waveforms such as Scholtz’s monocycle, etc. Besides, the power spectral density of UWB pulse does not need to be reduced over the whole frequency band. Therefore, it is possible to expand the communication range of UWB systems by increasing the transmitted power of UWB pulse.