433 MHz 數位無線收發機之測向系統與火災警報系統實現

Implementation of Radio Direction Finding and Fire Alarm Systems Using 433 MHz Digital Wireless Transceiver

王姵琪(Pei-Chi Wang)

指導教授 ： 余政杰

國立臺北科技大學/電資學院/電腦與通訊研究所/碩士(2012年)

https://doi.org/10.6841/NTUT.2012.00468

摘要

本數位無線系統研究使用之射頻收發模組，主要設計為ISM(工業、科學與醫療)和SRD(短距離設備)，其內部射頻收發積體電路是採用TI公司的高性能無線通訊晶片CC1101製作而成。
本論文研究主軸分為兩個部分，第一部分為數位無線收發測向系統，其分成兩階段設置，第一階段為在數位無線部分將PIC18LF4520微控器與433MHz射頻收發模組進行結合完成無線傳輸，第二階段為整合微控器、射頻收發模組及天線使測向系統更具備完整性。
在數據傳輸通訊中，經由PIC18LF4520微控器之串列周邊介面對射頻收發模組實施設置，並使用C語言撰寫程式，使系統架構更加俱備實用功能，並將微控器與射頻收發模組完成無線傳輸功能。在無線傳輸通訊中必須達到測向判別功用，本論文在無線傳輸部分，將具有全向性質的平面式微帶天線取代接收端原始射頻收發模組上的全向性天線，並透過射頻收發模組之接收訊號強度特性，藉以判別發射端與接收端之間的相對距離關係，並且正確的判別發射端位置，達到無線測向搜尋之功能。
第二部分為數位無線收發火災警報系統，此系統於發射端裝置溫度感測器，而在接收端裝置升壓聲光閃爍警報器，每當設置於發射端的溫度感測器感測到溫度數據達到臨界值，則發射端立即將警報數據無線傳輸給接收端，當接收端接收到發射端所傳輸之警報數據時，則啟動升壓電路使聲光閃爍警報器開始動作，藉以達到即時的民生安全防護措施。

關鍵字

數位無線 ； 射頻測向 ； 微控器 ； 串列周邊介面 ； 射頻收發模組 ； 訊號強度指示 ； 平面式微帶天線 ； 溫度感測器

並列摘要

In this thesis, the research are implemented to build a complete radio directional finding (RDF) and fire alarm systems. These architecture of Radio Directional Finding and fire alarm systems were composed of PIC18LF4520 microcontroller and RF transceiver module. The RFIC(CC1101) embedded in the RF transceiver module is equipped with the ability to dynamically update the content of the internal build received signal strength indicator(RSSI).
This dissertation is divided into two sections. First section is Radio Directional Finding system bring about two phases. The first phase is the data communications are properly set through the 4-wire serial peripheral interfaces(SPI) through the PIC18LF4520 microcontrollers with 433MHz RF transceiver modules to complete wireless transmission ; in the second phase, the radio directional finding (RDF) system is integration of PIC18LF4520 microcontroller, RF transceiver modules and antenna make the system with integrity. The research conducted in this thesis integrated not only hardware but also firmware. This system uses the C language constructs program and microstrip antenna to replace the original omnidirectional antenna at the receiver. Finally, we determine the transmitter location through RF transceiver modules of the received signal strength indicator(RSSI) characteristics.
The second section is fire alarm system. Digital thermometer installed in the transmitter. When the thermometer sensed data threshold is reached. The alarm system will be activated immediately. This system is intended to notify the building occupants to evacuate in the event of a fire.

並列關鍵字

Digital Wireless ； Radio Direction Finding ； Microcontroller ； Serial Peripheral Interface ； Radio Transceiver ； Received Signal Strength Indicator ； Microstrip Antenna ； Digital Thermometer

參考文獻

[7] S. E. Lpsky, Microwave Passive Direction Finding, John Wiley & Sons, 1987.

[14] B. A. Forouzan, Data Communications and Networking, McGraw-Hill, New York, 2007.

[17] M. Verle, PIC Microcontrollers, 1st Ed., mikroElektronika, 2008.

[20] V. Zeimpekis, G. M. Giaglis, and G. Lekakos, “A Taxonomy of Indoor and Outdoor Positioning Techniques for Mobile Location Services,” SIGecom Exchanges, ACM, vol. 3.4, 2003.

[21] S. Tekinay, “Wireless Geolocation Systems and Services, ” Special Issue of the IEEE Comm. Magazine, Apr. 1998.