Advanced Materials Research Vols. 588-589

Abstract: To enhance accurate Deinterleaving and identification rate of radar emitter signals to meet the requirements of modern electronic warfare, a novel method for radar emitter signals identification recognition is presented in this work. Firstly, instantaneous frequencies of radar signals are analyzed. Then additional derived characteristics and the extraction algorithm is proposed, based on which the Gray relational cluster analysis method is used to cluster and identify the radar emitter signals. The proposed method is applied to simulated six kind of typical radar emitter signals with different SNR. Simulation results show that the proposed method can achieve high accurate recognition rate.

Abstract: This paper analyzed the principle of the interpolation algorithm and the cause of spectrum leakage, derived an interpolation formulas of estimation the incoherent degree to correct the spectrum. Polynomial approximation method is used to get the correction formulas. Simulate results demonstrate that the correction Algorithm can reduced the spectral leakage and increase ADC parameters calculation accuracy.

Abstract: By particular theoretical analyzing on detection error of the traditional current loop proportion-integral (PI) controller, this paper points out the limitations of detection harmonic current at load side and proposes a current feedforward compensation controller. It can track harmonic instructions with zero static error and good compensation performance. Meanwhile, it overcomes the deficiencies of traditional load side detection harmonic current PI controller, with the traditional controller’s flexibility. Even if the load harmonic current is higher than the capacity of active power filter, it can basically maintain zero static error output and has certain theoretical significance and engineering value.

Abstract: This paper designs a hand-held radio frequency identification and localization terminal based on ARM Cortex-M3 processor and active radio frequency tags based on 8051 processor. This terminal uses STM32F103VET6 as its master controller, these tags use STC12C2052AD as their master controller. They all use Nordic nRF905 as their radio frequency identification module. The system works in 433M/868M/915MHz ISM UHF band and can read, write and locate radio frequency tags within 50m indoors. The actual measurement of active radio frequency tags shows that this terminal is highly stable and comparable in 433M/868M/915M ultra-high frequency radio identification and localization. The test results of this system are also analyzed and presented.

Abstract: This paper introduces a kind of numerical controlled LED drive power supply based on ARM7. User can set the number and brightness of the LEDs to be lit by the remote control. Switching voltage source and the linear constant current source are connected in series, this circuit structure can ensure high efficiency and small current ripple. ARM7 completes the data collection, fuzzy PID algorithm processing, and real-time output adjustment. This paper explains the working principle of the system in detail and then simulates it in the simulink. The results show that it can satisfy the users' diverse requirements well and give full play to the convenience and controllability of the digital controller.

Abstract: A method about the simulation system of automobile acceleration sensor basing on STM32 is introduced in this paper. This system can simulate acceleration sensor signal of the real car and make the status and values of acceleration sensor to be controlled by PC. Designing of the whole project, power on detection of the acceleration sensor and the Manchester Code used for information transferring between simulation system and airbag ECU are introduced in this paper. This design is used in the detection and diagnosis system of ABRS ECU to provide acceleration signal.

Abstract: This paper presents a 12-bit 1GS/s current-steering DAC with matching capacitor in switched current cell, which has been designed to enhance the DAC’s dynamic performance. Compared with traditional designs, the switched current cell with an matching capacitor can suppress the output-dependent delay differences effect. The Chip was designed by using TSMC 0.18μm CMOS mixed model, and the post-simulation results show that the DAC achieves 74.1 and 68.9 dBc SFDR at 1GS/s with 50MHz and 450MHz output frequency, respectively.

Abstract: At present the cross-correlation processing can only suppress the isotropic noise by vector hydrophone sound pressure and vibration velocity combined. The coherent composition of the actual ambient noise makes the detection ability of cross-correlation spectrum reduced. Use XWVD theory, proposed a cross symmetry-correlation function (Cross-SCF). Analysis of simulation data under different SNR and Different nature noise combination proving that the noise suppression Performance of suggested Cross-SCF has nothing to do with noise properties, and compared with the cross-correlation processing have indeed better than coherent noise suppression ability.

Abstract: The influence of amplitude and phase errors on precision of target position is analysed. To reduce amplitude and phase errors, iterative algorithm is applied in calibration. In this algorithm, amplitude and phase characteristics of all microwave components need to be tested.In this paper ,an auto-test system developed in VEE and based on GPIB serial bus technology is introduced. Compared with the traditional manual testing method, the anto-test system improves efficiency and accuracy on the test of digital attenuator and phase shifter with high resolution.

Abstract: In recent years, the secret place’s frequency occurrence of leaks has brought huge economic losses on the national security、 social stability and economic life, which not only seriously harmed the national interest, but also raised a range of negative social impacts. Therefore, implementing effective monitoring strategies to protect the secret place is of great significance. In the paper, the wireless short-range communication technology ZigBee was adapted to design a wireless monitoring system, the short-range communication technology ZigBee can network quickly and has many monitoring terminals, so it can monitor the equipments and materials, persons and the environment in the building and protect the security of buildings from the source.