通信系统

At the same time, check sum is sent and communication protocol is established to keep error data out and multi-period measuring method is taken to improve measuring precision. Affective anti-jamming measures are given after all-sided analysis on potential interference.

在软件上，为提高系统的抗干扰性能，参数的检测采用了数字滤波算法；为防止通信中误码的产生，采用了发送校验和的方式，制定了与上位机的通信协议，同时为提高测量的精度，在测量时采用了多周期测量方法。

Asynchronous communication for buses was developed to overcom the worst-case clock rate limitations of synchronous systems.

异步通信。总线的异步通信是为了克服同步系统中极差的时钟频率限制而开发的。

FOUNDATION fieldbus is a bi-directional communications protocol used for communications among field instrumentation and control systems.

基金会现场总线是一种双向通信协议，用与现场仪表和控制系统之间的通信。

In communications, a system of interconnected communication facilities.

在通信技术中，由互相连接的通信设备组成的系统。

The main controller compatible with DS87C550 and P87C552, implements the functions of system resource management and task schedule. The communicatory part, which expands the serial interfaces by TL16C554, implements the communication among the main controller, the remote communication terminal and the field devices. The interface part implements isolation between field devices and monitoring terminal with photoelectric coupling; Solar battery supplies power for the monitoring terminal.

主控部分兼容DS87C550和P87C552两种MCU，实现了系统资源的管理与任务调度；通讯部分采用TL16C554扩展了多个串口，实现了主控部分与远程通信终端及智能仪器之间的通信；接口部分采用光电耦合技术实现了现场设备与监控终端之间的电气隔离；采用太阳能供电技术为监控终端提供了电源。

In home RS422/RS485 is major way. Communication task, control and measure are complete by single CPU, which limited the development of performance.

目前国内在这一应用领域主要通信方式为RS422/RS485，继电保护器的测量、控制和通信任务由单CPU完成，制约系统性能的提高。

In this paper, the application of sun-blind-region ultraviolet spectrum in short-range cryptical communication is discussed, and an experimental system of ultraviolet communication is constructed.

本文对紫外日盲区光谱在近距离、保密通信中的应用进行了探讨，并建立了紫外光学通信原理实验系统。

In the paper, we give the method of checking form based on module 2 by searching the 16 bits Cyclic Redundancy Check Code .

本文研究了16位的循环冗余校验码CRC-CCITT在数据通信中的应用，给出了基于模2运算的查表法，实验证明：在保证了系统通信可靠性的基础上，大大提高了计算速度。

The design of field electric executer based on CAN bus is given,which uses AT89C51 as the control chip.The sys-tem is composed of signal acquisition module,motor driver module,communication module,power module and so on,and re-alizes local PID control and digital communication.

在基地式CAN总线电动执行器的设计中选用AT89C51为控制核心，该系统主要由信号采集模块、电机驱动模块、CAN通信模块、电源模块及键盘显示等部分构成，实现现场的PID控制及数字通信功能。

This paper reviews the history of frequency hopping communication technology development, and analyzes the present fh communication technology level and its future development trends.

本文首先回顾了跳频通信技术的历史发展，系统的总结和评析了跳频通信目前的技术水平状况以及其未来的发展趋势。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。