CAJ | 학술논문

介绍了一种卫星/惯性组合导航系统中的数据采集单元的设计过程及其测试结果。系统以低功耗单片机MSP430为控制器，并通过18 bit 8通道同步数据采集芯片AD7609采集三通道加速度计输出，通过串口扩展芯片XR16V554接收三通道数字化光纤陀螺的输出数据，由单片机串口接收GPS接收机的输出数据。单片机将采集到的数据打包后，通过串口输出给导航计算机进行解算。测试表明：表征数据采集单元3个模/数转换通道量化噪声水平的1小时采样数据的1σ标准差最大值为1.76μg(@1 Hz)，优于待测加速度计偏置稳定性(1小时采样数据的1σ标准差)为50μg(@1 Hz)的性能指标；数据采集单元同时能完成基于串口通信的陀螺输出信号、GPS接收机输出信号的接收及所有采集信号的正确传输。
개소료일충위성/관성조합도항계통중적수거채집단원적설계과정급기측시결과。계통이저공모단편궤MSP430위공제기，병통과18 bit 8통도동보수거채집심편AD7609채집삼통도가속도계수출，통과천구확전심편XR16V554접수삼통도수자화광섬타라적수출수거，유단편궤천구접수GPS접수궤적수출수거。단편궤장채집도적수거타포후，통과천구수출급도항계산궤진행해산。측시표명：표정수거채집단원3개모/수전환통도양화조성수평적1소시채양수거적1σ표준차최대치위1.76μg(@1 Hz)，우우대측가속도계편치은정성(1소시채양수거적1σ표준차)위50μg(@1 Hz)적성능지표；수거채집단원동시능완성기우천구통신적타라수출신호、GPS접수궤수출신호적접수급소유채집신호적정학전수。
A design of the data acquisition unit in the GPS/INS integrated navigation system is introduced,and its test result is analyzed. This data acquisition unit utilizes MSP430,a low power consuming single chip microcomput-er,as its controller. It can collects the output of three-channel accelerometers by using a eight-channel DAS with 18-bit simultaneous sampling ADC,AD7609,and receives the output data from three digital fiber-optic gyroscopes with a XR16V554 serial port expansion and a GPS receiver through the MSP430’s serial port. After being packaged by the microcomputer,the collected data will be transferred to a navigation computer via a serial port and be resolved. Test result shows that the maximum standard deviation of one hour sampling data(@1 Hz) which can characterize the three-channel A/D quantification noise is 1.76 μgn,it’s superior to the bias instability of the accelerometers, which its performance index is 50 μgn( the standard deviation of one hour sampling data(@1 Hz) ) . The data ac-quisition unit can simultaneously receive the output signal of a gyroscope and a GPS receiver based on serial com-munication and transmit all acquired signals correctly.