文中实现了一套以ARM为核心的小型化MEMS SINS/GNSS组合导航系统.MEMS陀螺、加速度计的模拟量输出经过AD采样,输入ARM微处理器进行惯性导航解算.GNSS芯片提供系统的速度和位置,与惯导解算的结果进行松组合,修正姿态角.由于航向角可观测性较差,采用了序贯卡尔曼滤波方式进一步修正航向角.经过跑车实验,与高精度惯性导航系统比较,俯仰角、横滚角误差小于0.5°,航向角误差小于0.9°.文中提供了一种低精度IMU参与组合导航的解决方案.

Weak leakage current of capacitive equipments and zinc oxide arrester is obtained by using active zero flux current transformer (CT),and high-precision synchronous sampling of 1 00 ns is realized by taking Inter Range Instrumentation Group-B(IRIG-B)as the synchronous sampling clock.On the above basis,field programmable gate array(FPGA)is used to produce multiple logic modules such as IRIG-B decoding,analog to digital converter(ADC)control,frequency measure-ment,lightning counting,temperature and humidity acquisition,and so on.Particularly by designing and realizing functions including multi-channel simulating signal sampling,storage and fast Fourier transformation (FFT)around FFT IP core,it is able to improve measurement accuracy as well as effectively reduce hardware costs of the device.Experimental and field op-eration data indicate that this device is able to satisfy requirements for online monitoring precision of the power system and has higher stability and scalability.

An intelligent high voltage switchgear cabinet is designed based on IoT(Internet of Things) technologies.Its IED(Intelligent Electronic Device) applies dual-CPU(DSP +ARM) structure,which collects the information from the intelligent monitoring unit via CAN bus/485 bus/ZigBee and communicates with the service center of substation control layer for remote monitoring according to IEC61850 protocol.Its intelligent control unit monitors the binary variables,temperature and humidity of cabinet and displays the states of cabinet via LCD screen/highlighted indictor bars/indictor lights.The control unit is also responsible for the electric operation control of cabinet.Device information is assigned as electronic tag inside the device,which is read and transmitted to the IED of cabinet by the intelligent recognition unit using RFID(Radio Frequency IDentification) technology.The received information is further sent to the integrated information platform for device locating and tracking.The intelligent high voltage switchgear cabinet is installed in a substation and operates well.

This thesis introduces a new intelligent insulation measure instrument,with the power supply,increased voltage,multiple voltage,sampling,hardware and software design of the calculating and display unit being explored,and problems and solutions in the measurement being discussed.