近年來由於全球無線通訊需求的快速成長，隨著使用量與資料量的遽增，使得原本使用低頻的c波段、x波段通訊已不敷需求，而高頻ka波段通訊的使用，可適時改善通訊擁塞的狀況，因此關於無線通訊傳播環境的研究，已日趨重要。我國第一顆兼具科學與通信功能的人造衛星中華衛星一號(ROCSAT-1)已在1999年一月發射升空。中華衛星一號上的通訊實驗酬載（ECP）將使用 ka 波段的電磁波與地面站作通訊，其標識訊號為19.5GHz。當此種波段的電磁波在地球大氣中傳播時，由於受到大氣的影響，會使得電磁波發生異常的傳播現象，而大氣的影響包括氧與水汽的吸收作用、雨滴的散射作用所造成的去極化現象、大氣折射指數變動所產生的閃爍現象、雨水造成的衰減效應等。本文將利用模擬估算得來的資料與地面站實際接收到的資料作處理和分析，並做進一步的探討。

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