基于幅移鍵控技術ASK（Amplitude-Shift Keying），以C8051F340單片機作為監測終端控制器，C8051F330D單片機作為探測節點控制器，采用半雙工的通信方式，通過監控終端和探測節點的無線收發電路，實現數據的雙向無線傳輸。收發電路采用直徑為0.8 mm的漆包線自行繞制成圓形空心線圈天線，天線直徑為（3.4±0.3）cm。試驗表明，探測節點與監測終端的通信距離為24 cm，通過橋接方式，節點收發功率為102 mW時，節點間的通信距離可達20 cm。與傳統無線收發模塊相比，該無線收發電路在受體積、功耗、成本限制的場合有廣闊的應用前景。 Abstract: Based on ASK technology and with the C8051F340 and C8051F330D MCU as the controller， using half-duplex communication mode， this paper achieves bi-directional data transfer. Transceiver circuit constituted by enameled wire which diameter is 0.8mm and wound into a diameter （3.4±0.3） cm circular hollow coil antenna. Tests show that the communication distance between detection and monitoring of the terminal is 24cm，the distance is up to 20cm between two nodes when using the manner of bridging and the node transceiver power is 102mW. Compared with the conventional wireless transceiver modules， the circuit has wide application prospect in small size， low cost and low power consumption and other characteristics.
上傳時間： 2013-10-19
上傳用戶：xz85592677
為解決輸油管道溫度壓力參數實時監測的問題，設計了以C8051F930單片機作為控制核心的超低功耗輸油管道溫度壓力遠程監測系統。現場儀表使用高精度電橋采集數據，通過433 MHz短距離無線通信網絡與遠程終端RTU進行通信，RTU通過GPRS網絡與PC上位機進行遠程數據傳輸，在上位機中實現數據存儲和圖形化界面顯示，從而實現輸油管道溫度壓力參數的實時監測和異常報警。經實驗證明，該系統的12位數據采集精度滿足設計要求，漏碼率小于1%，正常工作時間超過5個月，能實時有效地監測輸油管道的溫度壓力參數，節省大量人工成本，有效預防管道參數異常造成的經濟損失和環境污染。 Abstract: In order to solve the problems on real-time monitoring of pipeline temperature and pressure parameters， the ultra-low power remote pipeline temperature and pressure monitoring system was designed by using the single chip processor C8051F930 as the control core. The high-precision electric bridge was used in field instruments for data collection， the 433MHz short-range wireless communication network was used to make communication between field instrument and RTU， the GPRS was used by the RTU to transmit data to the PC host computer， and the data was stored and displayed in the PC host computer， so the real-time monitoring and exception alerts of pipeline temperature and pressure parameters were achieved. The experiment proves that the system of which error rate is less than 1% over five months working with the 12-bit data acquisition accuracy can effectively monitor the pipeline temperature and pressure parameters in real time， it saves a lot of labor costs and effectively prevents environmental pollution and economic losses caused by abnormal channel parameters.
上傳時間： 2013-11-07
上傳用戶：cuibaigao
When I started writing the first edition of RF Power Amplifiers for Wireless Communications,some time back in 1997, it seemed that I was roaming a largely uninhabitedlandscape. For reasons still not clear to me there were few, if any, otherbooks dedicated to the subject of RF power amplifiers. Right at the same time, however,hundreds of engineers were being assigned projects to design PAs for wirelesscommunications products. It was not, therefore, especially difficult to be successfulwith a book that was fortuitously at the right place and the right time.
標簽： Communications Amplifiers Wireless Edition
上傳時間： 2013-11-12
上傳用戶：YYRR
Linear Technology offers some of the highest performance RF and signal chain solutions for wireless and cellularinfrastructure. These products support worldwide standards including, LTE, WiMAX, GSM,W-CDMA, TD-SCDMA,CDMA, and CDMA2000. Other wireless systems include broadband microwave data links, secure communications,satellite receivers, broadband wireless access, wireless broadcast systems, RFID readers and cable infrastructure
上傳時間： 2013-11-04
上傳用戶：kiklkook
program to trasmit data to a TI92 with the TI Graph-Link
標簽： Graph-Link program trasmit data
上傳時間： 2015-01-03
上傳用戶：youke111
A Library of Efficient Data Types and Algorithms,封裝了常用的ADT及其相關算法的軟件包
標簽： Algorithms Efficient Library Types
上傳時間： 2014-01-10
上傳用戶：fhzm5658
network programming with j2me wireless devices
標簽： programming wireless network devices
上傳時間： 2014-08-30
上傳用戶：yuzsu
Data monkey是一個強大的是數據傳輸和轉換應用程序。使用DataMonkey用戶可以把復雜的文本文件格式，數據庫數據，甚至客戶設備中的數據在其他設備上轉換為其他格式。
標簽： DataMonkey monkey Data 數據傳輸
上傳時間： 2013-12-22
上傳用戶：星仔
7811 Data Sheet
上傳時間： 2015-01-10
上傳用戶：壞天使kk
魔獸爭霸3 Manifest-Version: 1.0 MicroEdition-Configuration: CLDC-1.0 MIDlet-Data-Size: 15000 MIDlet-Description: Warriors of the Lion MIDlet-Version: 1.0.0 MIDlet-Icon: /icon.png Created-By: 1.3.1_01 (Sun Microsystems Inc.) MIDlet-Vendor: www.elkware.com MicroEdition-Profile: MIDP-1.0 MIDlet-1: Warriors of the Lion, ,z MIDlet-Name: Warriors of the Lion MIDlet-Info-URL: www.elkware.com
標簽： MicroEdition-Configuration Manifest-Version MIDlet-Data-Size MIDlet-Desc
上傳時間： 2015-01-11
上傳用戶：tuilp1a
