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Matched filtering is an important method in radar signal processing to enhance the radar system performance. In this paper, the concept of the matched filtering is generalized to the fractional Fourier case. The response of the matched filter in fractional Fourier domain to chirp signals is analyzed, and the sidelobe suppression method for matched filtering in the fractional Fourier domain is considered...
In this paper, we consider analysis and processing of chirp pulses using the matched fractional Fourier transform (FRFT). Using the properties of the FRFT and the ambiguity function, the resolution performances of time delay and Doppler shift for chirp pulses based on the matched FRFT are derived systematically. The method for sidelobe suppression using the matched FRFT is also proposed. Simulation...
This study presents a low-power wireless sensors system, which is based on a modular design approach for online monitoring the vibration signal of industrial equipment and the temperature and humidity of working environment. The system uses Low-power microcontroller MSP430 as the control unit, and uses the highly integrated modular device to collect the needed signal. A simple and efficient underlying...
The measurement of network congestion and degradation of quality of service during distributed denial of service attacks remained an elusive goal. This paper analyzes the impacts that all congested links cause on attack victim and network architecture, introduces the min-cut set and presents a new method to assess the network security situation under DDoS attacks, which computes the influence value...
The battery state-of-charge (BSOC), which is a key reference for battery management, can not be measured directly. An estimation approach for the SOC of the individual lithium-ion battery cell used in applications where the battery load is very unstable is studied. The estimator model based on fuzzy neural network (FNN) is proposed, considering the battery terminal voltage, discharge current and battery...
This paper analyzes the characteristics of a small turbojet engine starting process, it puts forward an idea of building models in accordance with the different phases of the starting process. Taking use of the method which combines the starting test data and physical models, it establishes models of speed and starting current of the starting process, and it optimizes and simulates the dynamic process...
In the GPS signal tracking of cascade deeply coupled GPS/SINS system, the model of baseband pre-filter has strong nonlinearity while the correlator outputs, I/Q signals, is taken as observation directly. To reduce the complexity of deeply coupled GPS/SINS, the phase discriminator outputs are selected as the baseband pre-filter measurements. The major disadvantage of this filter model is not precise...
A simple power supply solution with solar energy photovoltaic cells is put forward for low-power field devices like wireless sensor network (WSN) nodes for environmental surveillance. In order to reduce the system's power loss and improve the efficiency of solar energy photovoltaic cells, the battery's output characteristics and the leakage current of supercapacitor (SC) are investigated and the power...
In this paper, the adaptive genetic algorithm combined with the whitening filter is proposed to search for correct ambiguities for GPS attitude determination system. First of all, the float ambiguities are carried out by Kalman filter, and then the whitening transformation is used to reduce higher correlation of integer ambiguities. Finally, the decorrelated ambiguities are searched in the transformed...
The accurate measured value of the electric field strength under the UHVDC (Ultra High Voltage Direct Current) transmission line is one of the important indexes for assessing whether the UHVDC is laid properly. The accurately calibrated electric field sensor is the premiss for correctly measuring electric filed strength. Based on the finite element method, this article presents the finite element...
A Solenoid valve Operating Life test system based on PLC was developed in order to examine the reliability and durability of a certain type solenoid valve,. In this paper, not only structure and principle of the test system, but also hardware and software design of the test system were illustrated in detail. The really applied results show that the test system can control test parameters quickly and...
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