【摘要】：將鉆桿內(nèi)孔視為超長不規(guī)則有耗圓波導,采用多徑傳輸理論建立信道模型,結(jié)合實驗統(tǒng)計法,對信道特征及信號衰減機理進行了研究分析.分析結(jié)果表明,廣泛應用于空氣鉆井領域的API 5″和5~(1/2)″鉆桿,其內(nèi)孔可以作為2.4GHz頻段微波信道,且一根鉆桿單元構(gòu)成的微波信道基本符合超寬帶信道標準.但鉆桿接頭段具有多個反射面,導致信道具有雙簇多徑信道的特性,雙簇間較大的時延令信道均方時延擴展大幅增加.根據(jù)模型對比結(jié)果,多徑衰落和時延是影響該信道傳輸質(zhì)量的主要因素.
[Abstract]:The inner hole of the drill pipe is regarded as an ultra-long irregular lossy circular waveguide. The channel model is established by using the multi-path transmission theory. Combined with the experimental statistical method, the channel characteristics and signal attenuation mechanism are studied and analyzed. The analysis results show that the inner hole of API 5 "and 5 ~ (1 鈮，

本文編號：2507153