惯性测量单元/实时动态载波相位差分(Inertial Measurement Unit/Real Time Kinematic,IMU/RTK)测量技术的出现为山区分散型宅基地测量工作提供了新思路。本文以华测i90型号的IMU/RTK测量设备为例,探讨IMU/RTK在倾斜角不大于30°情...惯性测量单元/实时动态载波相位差分(Inertial Measurement Unit/Real Time Kinematic,IMU/RTK)测量技术的出现为山区分散型宅基地测量工作提供了新思路。本文以华测i90型号的IMU/RTK测量设备为例,探讨IMU/RTK在倾斜角不大于30°情况下的测量精度及稳定性,并通过与全站仪测量坐标进行对比,证明IMU/RTK测量在倾斜角不大于30°的山区能满足分散型宅基地的测量精度要求。展开更多
Under dynamic conditions, the signals of power system have time-varying magnitude and frequency, which might lead to considerable errors for synchrophasor measurement. The traditional discrete Fourier transform (DFT) ...Under dynamic conditions, the signals of power system have time-varying magnitude and frequency, which might lead to considerable errors for synchrophasor measurement. The traditional discrete Fourier transform (DFT) based algorithms used in Phasor Measurement Unit (PMU) are hard to meet the requirements of measurement accuracy because of the existence of spectral leakage. A dynamic phasor measurement algorithm is proposed in this paper in which the input sampled data are considered as non-stationary signals with amplitude modulation-frequency modulation (AM-FM) form, and the measurement is achieved by AM-FM demodulation. An angle-shifted energy operator (ASEO) is used to extract the instantaneous amplitude and low pass differential filter is introduced for frequency estimation. Simulation results indicate that the proposed algorithm can effectively improve the phasor measurement accuracy and has very short response time for PMU under dynamic conditions.展开更多
文摘惯性测量单元/实时动态载波相位差分(Inertial Measurement Unit/Real Time Kinematic,IMU/RTK)测量技术的出现为山区分散型宅基地测量工作提供了新思路。本文以华测i90型号的IMU/RTK测量设备为例,探讨IMU/RTK在倾斜角不大于30°情况下的测量精度及稳定性,并通过与全站仪测量坐标进行对比,证明IMU/RTK测量在倾斜角不大于30°的山区能满足分散型宅基地的测量精度要求。
基金supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No.20090002110040)
文摘Under dynamic conditions, the signals of power system have time-varying magnitude and frequency, which might lead to considerable errors for synchrophasor measurement. The traditional discrete Fourier transform (DFT) based algorithms used in Phasor Measurement Unit (PMU) are hard to meet the requirements of measurement accuracy because of the existence of spectral leakage. A dynamic phasor measurement algorithm is proposed in this paper in which the input sampled data are considered as non-stationary signals with amplitude modulation-frequency modulation (AM-FM) form, and the measurement is achieved by AM-FM demodulation. An angle-shifted energy operator (ASEO) is used to extract the instantaneous amplitude and low pass differential filter is introduced for frequency estimation. Simulation results indicate that the proposed algorithm can effectively improve the phasor measurement accuracy and has very short response time for PMU under dynamic conditions.
