Ultrasonic transmitting, receiving and amplifying circuits are designed. Thereceived signals are sampled with the high speed ADC (analog-to-digital converter), and dealt withthe DSP (digital signal processing). A forw...Ultrasonic transmitting, receiving and amplifying circuits are designed. Thereceived signals are sampled with the high speed ADC (analog-to-digital converter), and dealt withthe DSP (digital signal processing). A forward-backward IIR (infinitive impulse response) filterwith no delay is designed to filter the sampled data, and series A and B are achieved by narrow andwide band filtering, respectively. In series A, the start point of the cycle first exceeding thethreshold is calculated accuratelyby interpolation, and the start cycle is detected by fittingcycles in series A and its inversion A' to cycles in B with variance analysis. Therefore, the startpoint of the start cycle is calculated precisely. By deriving the relationships between the traveltime in the opposite directions of three axes and the airflow velocities, the wind velocity anddirection are calculated. Experiments show that the reliability and the precision are improved, andthe circuits are simplified.展开更多
针对电力系统中谐波检测实时性、准确性要求较高的特点,设计并实现了基于DSP有源电力滤波器(APF,active power filter)的电力监控系统。主要介绍了硬件结构和软件功能,并详细阐述了采用VC6.0作为开发语言的上位机监控系统软件的设计及...针对电力系统中谐波检测实时性、准确性要求较高的特点,设计并实现了基于DSP有源电力滤波器(APF,active power filter)的电力监控系统。主要介绍了硬件结构和软件功能,并详细阐述了采用VC6.0作为开发语言的上位机监控系统软件的设计及其实现的方法和技术,包括实时数据采集与动态图形显示、工控机和下位机DSP的串口通信技术、数据库管理技术等。系统实现了工控机对电力系统的实时检测与准确控制,分析和验证了VC6.0用于电力系统控制软件设计与开发的可行性和有效性。展开更多
针对电力系统中谐波检测实时性、准确性要求较高的特点,在设计并实现了基于DSP的有源电力滤波器(Active Power Filter,简称APF)的基础上,为了增强人机交互的智能性,开发了基于VB6.0的上位机APF监控系统。主要介绍了硬件系统结构及软件功...针对电力系统中谐波检测实时性、准确性要求较高的特点,在设计并实现了基于DSP的有源电力滤波器(Active Power Filter,简称APF)的基础上,为了增强人机交互的智能性,开发了基于VB6.0的上位机APF监控系统。主要介绍了硬件系统结构及软件功能,并详细阐述了基于VB6.0程序设计语言和MSComm控件的上位机监控系统的设计,包括串口通信、数据库管理、动态图形显示、历史数据查询等功能模块。系统实际运行验证了VB6.0用于电力系统控制软件设计与开发的可行性和有效性。展开更多
A design method for parallel processing application on multi-channel low-intermediate-frequency(LIF) digital receiver was presented. It is based on the DSP sub-array with a simple topology and operation timing to eval...A design method for parallel processing application on multi-channel low-intermediate-frequency(LIF) digital receiver was presented. It is based on the DSP sub-array with a simple topology and operation timing to evaluate and determine the processing capability and then construct the parallel processing array for multi-channel signals according to the restriction of operation timing. Using this method, the design of multi-channel digital receiver may be simplified. Finally, a design example was used to show how to apply this method.展开更多
文摘Ultrasonic transmitting, receiving and amplifying circuits are designed. Thereceived signals are sampled with the high speed ADC (analog-to-digital converter), and dealt withthe DSP (digital signal processing). A forward-backward IIR (infinitive impulse response) filterwith no delay is designed to filter the sampled data, and series A and B are achieved by narrow andwide band filtering, respectively. In series A, the start point of the cycle first exceeding thethreshold is calculated accuratelyby interpolation, and the start cycle is detected by fittingcycles in series A and its inversion A' to cycles in B with variance analysis. Therefore, the startpoint of the start cycle is calculated precisely. By deriving the relationships between the traveltime in the opposite directions of three axes and the airflow velocities, the wind velocity anddirection are calculated. Experiments show that the reliability and the precision are improved, andthe circuits are simplified.
文摘针对电力系统中谐波检测实时性、准确性要求较高的特点,设计并实现了基于DSP有源电力滤波器(APF,active power filter)的电力监控系统。主要介绍了硬件结构和软件功能,并详细阐述了采用VC6.0作为开发语言的上位机监控系统软件的设计及其实现的方法和技术,包括实时数据采集与动态图形显示、工控机和下位机DSP的串口通信技术、数据库管理技术等。系统实现了工控机对电力系统的实时检测与准确控制,分析和验证了VC6.0用于电力系统控制软件设计与开发的可行性和有效性。
文摘针对电力系统中谐波检测实时性、准确性要求较高的特点,在设计并实现了基于DSP的有源电力滤波器(Active Power Filter,简称APF)的基础上,为了增强人机交互的智能性,开发了基于VB6.0的上位机APF监控系统。主要介绍了硬件系统结构及软件功能,并详细阐述了基于VB6.0程序设计语言和MSComm控件的上位机监控系统的设计,包括串口通信、数据库管理、动态图形显示、历史数据查询等功能模块。系统实际运行验证了VB6.0用于电力系统控制软件设计与开发的可行性和有效性。
文摘A design method for parallel processing application on multi-channel low-intermediate-frequency(LIF) digital receiver was presented. It is based on the DSP sub-array with a simple topology and operation timing to evaluate and determine the processing capability and then construct the parallel processing array for multi-channel signals according to the restriction of operation timing. Using this method, the design of multi-channel digital receiver may be simplified. Finally, a design example was used to show how to apply this method.
