無線網路在現今社會已經被使用的相當廣泛，基於這個原因，我們可以利用環境中已架設好之無線存取點來發展無線網路定位技術，可以節省建置系統之硬體成本。另外，現今台灣老年人口已達全人口之10.09%（約231萬人），人口高齡化現象伴隨產生的安養與照護問題值得深入探討。由於高齡者生理老化衰退、突發性疾病發生或是其他環境意外傷害的頻率高於其他年齡層，並且意外發生時如果救援時間拖久了，沒有即時醫療照護，意外傷害往往會較為嚴重。因此定位系統是為了在高齡者發生意外時，減少找尋高齡者位置的時間，以最短的時間發現並且到達高齡者發生意外的位置，給予即時的救援。論文中探討了現有的定位技術及其優缺點與產品，而且在應用時將會遭遇到的問題。然而，文中提到的方法存在一些缺點，例如：硬體成本高、耗人力、費時以及要定期的去做測量工作，使用參考點的方式可以克服這些缺點，所以在定位技術是採用參考點的方式。定位行動裝置隨時都能定出高齡者的所在位置，並且當高齡者發生意外觸發了定位裝置上的緊急按鈕，能夠即時的將高齡者的位置透過定位系統傳送訊息給救援人員，讓救援人員能即時的知道高齡者位置，以縮短找尋高齡者位置的時間達到即時救援，降低高齡者因錯過即時救援而造成嚴重傷亡的機率。

Wireless network has been widely used in today's society. We can develop a wireless network positioning technology based on the already set-up wireless access points to save the cost of building hardware systems. In addition, Taiwan's elderly population has reached 10.09 percent of the entire population (about 2.31 million people). The nursing and caring issues accompanyied by the advanced age phenomenon are worthy of in-depth study. As the elderly age, their bodies recess physiologically, increasing greater risks of being struck by acute illnesses or environmental harm than the other age groups. Without immediate medical care, the degree of injury tends to be more serious. The positioning system, therefore, shortens the time needed to find the injured elderly and is able to locate the site precisely, giving the person in need the most immediate rescue. Studies on the existing positioning technology and its advantages and disadvantages will be discussed in this paper along with the application problems encountered. The method mentioned in this paper has some shortcomings, for example: high hardware cost, manpower-consuming, time-consuming, and having to take measurement on a fixed schedule basis. However, employing the reference point will overcome the problems. Hence, the reference point is used in the positioning technology of this study. The positioning device is able to locate the senior citizen at all times. And when the accident button on the device is triggered, it is able to send signal to the rescuers regarding the elderly whereabouts through the positioning system. It shortens the time spent on locating the injured so as to give immediate rescue. Consequently, the serious injury rate causing by the miss of immediate rescue opportunity among senior citizens can be greatly reduced.