Cells may vary in radius from 1 to 30 kilometres 0. The boundaries of the cells can also overlap between adjacent cells and large cells can be divided into smaller cells.
How to quickly and accurately detect the error of NC machine has become a hot issue for domestic and foreign scholars. Based on GPS principle, a laser tracker is adopted the multi-station and time-sharing measurement to rapidly and accurately detect the geometric accuracy of NC machine. The machine is controlled to move in the preset path, and a laser tracker is used to measure the same motion trajectory of the machine successively at different base stations.
The position of base station and the space coordinates of measuring points can be determined based on large amount of measured data. The algorithms of multi-station and time-sharing measurement are given, and the influencing factors of measurement results are discussed in the paper.
Meanwhile, a detection system of machine error is developed based on the platform of Matlab, which can quickly process the measured data and shows each error of machine intuitively.
An Ultrasonic water level measurement system based on GPS is presented. According to the ultrasonic principle and GPS positioning technology, the secondary ultrasonic reflection in the air and the time spent in the liquid are measured to calculate the height of the water level and the depth of the liquid.
The temperature compensation circuit is designed to improve the measurement precision.
The use of GPS, the specific location of measurement points can be got, and the key position multi-point level measurement, cycle monitoring, real-time monitoring and mobile monitoring can be achieved 67 Optical Fiber Temperature Measuring Technology Application Research in Power System Authors: Zhi Qiu Han Abstract: Electrical overheating and fire are multiple faults in power system, optical fiber temperature measurement technology is better than the traditional temperature measurement device.
It can test electrical system changes in temperature more effective and reliable, thus effectively contain similar accidents.
This paper expounds the optical fiber temperature monitoring system warning the working principle, system constitution and its characteristics, discusses the practical application of optical fiber temperature warning monitoring system in power system.
In order to solve the problem of the calibration for the open-channel flow meter; the online calibration equipment was introduced.
The velocity-area method was adopted as the measurement principle. The real time velocities and liquid level of different feature points in the open-channel were measured automatically.
The flow rate of the open-channel was calculated and the online calibration was done. To acquire torque performance in seat belt conveniently and precisely, the measurement scheme based on stepper motor was established. The hardware was developed with high-speed data acquisition unit based on PCI protocol.
The software which includes user interface and data acquisition control module etc was developed with multithread technique and document-view architecture.
The experiments with seat belt spring show that the max torque error of the system is 0. The system has merits of high precision, easy operation and can provide reliable data for spring torque performance in seat belt.A cellular network or mobile network is a communication network where the last link is wireless.
The network is distributed over land areas called cells, each served by at least one fixed-location transceiver, but more normally three cell sites or base transceiver stations. Wireless communications is, by any measure, the fastest growing segment of the communications industry.
As such, it has captured the attention of the media and the imagination of the public. What is a wireless network or WiFi network? Wireless is an essential productivity tool for your company's mobile workforce, helping employees stay connected to the corporate network and internet.
What are the principles of cellular networks? October 18, rsm Cellular technology is the basis for mobile wireless communications and supports users in locations that are .
All home security systems work on the same basic principle of securing entry points, like doors and windows, as well as interior space containing valuables like art, computers, guns, and coin collections.
A wireless network or Wireless Local Area Network (WLAN) serves the same purpose as a wired one — to link a group of computers. A wireless network or Wireless Local Area Network (WLAN) serves the same purpose as a wired one — to link a group of computers. Because "wireless" doesn't require.