野地研究考量人員成本以及突破地理限制，必須仰賴無線通訊系統，但野外環境容易受到破壞，通訊設備必須能夠在野外環境變化後，能夠改變原本使用的通訊方式，自動重新建立新選擇的通訊方式，使得人員無法在第一時間前往野地時，依舊能夠可遠端確認儀器狀況，而作出妥善抉擇。
本研究目的在於建立一套兼具經濟性、效益性及穩定性的多模組式傳輸裝置(Multi-mode Transmission Device，MTD)，透過連接不同無線通訊系統，銥衛星、行動電話(GPRS/3G)和微波系統等，作為多模式傳輸裝置的通訊子系統，以應付通訊環境的變化。
我們實作出系統，依據通訊成本和通訊能力，決定好各通訊子系統的使用順序，微波系統、3G、GPRS、Iridium，以此決定設計一套偵測通訊環境的演算法，並將水位監測系統結合我們設計的多模式傳輸系統。
在外海的測驗結果顯示，在通訊環境的變化下，依然能夠選擇適合的子通訊系統，確保水位資料和影像資料能夠持續傳送。未來可透過更進一步的整合，可將此系統用於多項野地研究計畫，提高各野地系統的通訊強健性，並更彈性的選擇符合的通訊子系統。

The researchers must consider the cost of labor power and use wireless communication technique to break the limitation of geography in field surveillance. But the environments of communication in fields are fragile and usually with alteration by natural disaster even terrorist attack. The system must have abilities to transfer the previous communication system and to choose new appropriate communication system. Let people still remote the system and make a right choice without taking any risks.
The motivation of our research is developing a reliable multi-mode transmission device to self-reconstruct the stable and appropriate communication sub-system after the alteration of the communication environments. The communication sub-system of ours includes Iridium satellite communication system with high cost and high efficiency, wireless-based communication system as microwave, and the most popular and most convenient communication system, GPRS and 3G.
We implement the multi-mode transmission system with water level surveillance system. We also make a decision of the sub-mode operation order, and then design the algorithm to detect the alteration of the communication environments according to the operation order, which is microwave, 3G, GPRS, and Iridium.
In the result of testing in ocean, the system indeed keep transmitting water level data and video images after the alteration. We can provide advanced system or single device to present field researches or future ones after the high level integration. In the future, field research or surveillance system will have high robustness of communication abilities, and also have flexibility with alternative communication sub-system

參考文獻
[1] Andreadis, Alessandro and Giambene, G., Ch.2, The Global System for Mobile Communications, Protocols for High-Efficiency Wireless Networks, pp. 17-44, Springer, 2002.
[2] Brief History of GSM & the GSMA, GSM World, GSM World, 2008, http://www.gsmworld.com/about/history.shtml.
[3] Frequency Bands of GSM/GPRS/EGPRS Online User's Guide, Agilent, 2008, http://wireless.agilent.com/rfcomms/refdocs/gsmgprs
/gen_bse_cell_band.php
[4] GSM World Coverage Map and GSM Country List, World Time, 2008, Zone, http://www.worldtimezone.com/gsm.html
[5] Wireless Application Protocol white paper, WAP forum, 2000, http://www.wapforum.org/what/WAP_white_pages.pdf
[6] Pribylov, V.P. and Rezvan, I.I., “On the way to 3G networks: the GPRS/EDGE concept,” in Proceedings of the 4th IEEE-Russia Conference on Microwave Electronics: Measurements, Identification, Applications, pp.87-98, 2003.
[7] GPRS white paper, Cisco Systems, Inc., 2000, http:// www.cisco.com/warp/public/cc/so/neso/gprs/gprs_wp.pdf
[8] 劉鶴笙，GSM/GPRS無線通信系統於地理位置監控之應用，國立成功大學航空太空工程學系碩士論文，民國91年。
[9] Andreadis, Alessandro and Giambene, G., “Protocols for High-Efficiency Wireless Networks,” Ch.3, 3G mobile systems, pp. 45-89, Springer, 2002.
[10] Third Generation (3G) Wireless White Paper, Trillium Digital Systems, Inc., 2000, http://members.tripod.com/~srohit/wp_3g.pdf
[11] White Paper of WiMAX–IEEE 802.16 and WiMAX, Intel, 2003, http://www.wimax-industry.com/wp/papers/intel_80216_wimax.pdf
[12] Understanding the Radio Technologies of Mobile WiMAX and their effect on network deployment optimization, alvarion, 2006, http://www.wimax-industry.com/wp/papers/alvarion_radio_mobile_wimax_wp.pdf
[13] Capturing customers today with WiMAX 802.16d: The business and technology case for fixed WiMAX, SOLECTEK, 2007, http://www.wimax-industry.com/wp/papers/wp-WiMAX16d.pdf
[14] Fulvio Ananasso and Francesco D. Priscoli, “The role of satellites in personal communication services,” Wireless Networks, Vol.4, No.2, pp.155-165, 1998.
[15] Wood, P., “Mobile satellite services for travellers,” Communications Magazine, IEEE, vol.29, no.11, pp.32-35, Nov 1991.
[16] Andreadis, Alessandro and Giambene, G., Ch.4, Satellite Communications, Protocols for High-Efficiency Wireless Networks, pp. 91-114, Springer, 2002.
[17] Dietrich, F.J.; Metzen, P.; Monte, P., “The Globalstar cellular satellite system,” Antennas and Propagation, IEEE Transactions on , vol.46, no.6, pp.935-942, Jun 1998.
[18] Gasparollo, L. and Bailey, E., “The Globalstar system: a complement to terrestrial mobile networks,” Mobile and Personal Satellite Communications 2, 1996. Proceedings of the Second European Workshop on Mobile/Personal Satcoms (EMPS '96) , vol., no., pp.508-516, 1996.
[19] Coverage Map of GLOBALSTAR, http://common.globalstar.com
/images/coverage/coveragemap_nolegend_gusa.jpg
[20] Goldstein, I., “INTELSAT and the Developing World,” Communications, IEEE Transactions on [legacy, pre - 1988] , vol.24, no.7, pp. 742-748, Jul 1976.
[21] Lilly, C.J., “Intelsat's new generation,” IEE Review, vol.36, no.3, pp.111-113, 8 Mar 1990.
[22] Bargellini, P., “The INTELSAT satellite communications network,” Communications Society: A Digest of News and Events of Interest to Communications Engineers, vol.12, no.6, pp. 8-13, Nov 1974.
[23] Coverage Map of International Telecommunications Satellite, http://www.intelsat.com/flash/coverage-maps/covmaphome.htm
[24] Inmarsat Annual report and accounts 2007, Inmarsat, 2007, http://www.inmarsat.com/Downloads/English/Investors/Inmarsat_Annual_Report_Accounts_2007.pdf?language=EN&textonly=False
[25] Mullins, D.R.; El Amin, M.; Poskett, P., “INMARSAT 3 communications system requirements,” INMARSAT-3, IEE Colloquium on, vol., no., pp.2/1-2/6, 21 Nov 1991.
[26] Coverage Map of International Maritime Satellite, http://www.inmarsat.com/Downloads/English/Coverage/Post_Repositioning_coverage.pdf?language=EN&textonly=False
[27] Brunt, P., “IRIDIUM – overview and status,” Space Communications, Vol.14, No.2, pp.61-68, 1996.
[28] Carl E. Fossa, Richard A. Raines, Gregg H. Gunsch, and Michael A. Temple, “An Overview of the IRIDIUM Low Earth Orbit Satellite System,” National Aerospace Engineering Conference (NAECON), 1998, pp. 152-159.
[29] R.J. Leopold; A. Miller, “The IRIDIUM communications system,” Microwave Symposium Digest, 1993., IEEE MTT-S International , vol., no., pp.575-578 vol.2, 1993
[30] Coverage Map of Iridium, http://www.geom.uiuc.edu/~worfolk/
SaVi/images/iridium_coverage.gif
[31] Timo Halonen, Javier Romero, and Juan Melero, “GSM, GPRS, and edge performance: evolution towards 3G/UMTS,” John Wiley & Sons, 2003.
[32] Comparing Mobile WiMAX, 3G and Beyond: A technical comparison of mobile WiMAX and third generation mobile technologies, alvarion, 2007, http://www.wimax-industry.com/wp
/papers/Comparing_WiMAX_vs_3G_White_Paper.pdf
[33] Cost Action 255, Final Report, “Radiowave Propagation Modelling for SatCom Services at Ku-Band and Above,” European Space Agency, 2002.
[34] Radio Signal Propagation, Breeze Wireless Communications Ltd., http://didier.quartier-rural.org/implic/ran/sat_wifi/sigprop.pdf
[35] An Introduction to Microwave Radio Link Design, SAF Tehnika, 2002, http://www.fortech.lt/docs/SAF_CFM_serijos/Link_design.
Guide.pdf
[36] 蔡松家，洪水預警系統及資料庫建置與管理之研究，國立成功大學水利及海洋工程學系碩士論文，民國94年。
[37] 顧浩翔，無線通訊系統應用於土石流災區之即時性災情預防與通報，國立屏東科技大學資訊管理學系碩士論文，民國93年。
[38] 何宗哲，利用GPRS無線通訊作為UAV之雙向資料傳輸介面，國立成功大學航空太空工程學系碩士論文，民國94年。
[39] 洪士偉，海洋箱網聲學警示系統之研發，國立中山大學海下技術所碩士論文，民國94年。
[40] 林聖宗，整合GPS與GSM/GPRS Module之人身保全應用，國立台灣科技大學電子工程學系碩士論文，民國97年。
[41] 邱大幅，無人機房資料蒐集與傳輸系統研究與開發－以環保署空品站為例，國立中央大學環境工程研究所碩士論文，民國95年。
[42] 洪偉綱，智慧型運輸系統中無線通訊網路評選之研究—以先進大眾運輸系統為例，國立交通大學運輸科技與管理學系碩士論文，民國92年。
[43] 朱伯勳，GPS衛星測量於遠距離地滑監測的應用研究，中原大學土木工程所碩士論文，民國94年。
[44] 曾聖文，瀰漫式個人行動通訊系統，國立中正大學通訊工程所碩士論文，民國96年。
[45] Mohammad Abdul Jabbar, “Multi-Link Iridium Satellite Data Communication System,” Electrical Engineering, Osmania University, Hyderabad, India, 2001.
[46] Military Electronics April 2006, Penton's Military Electronics, http://www.milelec.com/cluster/common/mwrf/milelec/pdf/milelec4.pdf
[47] Flood Mitigation Grid, National Center for High-Performance Computing, http://hmerg.nchc.org.tw/sensornet/
[48] 水災災害即時影像監視及應變決策資訊系統，經濟部水利署，民國95年。
[49] 海氣象即時觀測及監視系統，交通部運輸研究所，民國97年。
[50] Free Space Loss Calculator, COMSEARCH, http://www.
comsearch.com/satellite/tools_fsl.jsp
[51] Calculations: Free Space Loss, Proxim Wireless, http://www.
terabeam.com/support/calculations/free-space-loss.php#calc
[52] Calculations: System Operating Margin, Proxim Wireless, http://www.terabeam.com/support/calculations/som.php#calc
[53] S.M. Huang, Y.C. Sung, S.Y. Wang, and Y.B. Lin, “NCTUns Simulation Tool for WiMAX Modelling,” Third Annual International Wireless Internet Conference, October 22-24, 2007, Austin, Texas, USA.