GPS系統(tǒng)采用偽碼測距

1、GPS系統(tǒng)采用偽碼測距has been widely used in the military. Traditionally, the GPS receiver locks onto the C/A code to extract the navigation data message. Then, starting from the HOW of the navigation data, acquisition is transferred to the P-code acquisition. However, because of short period and low chip rat

2、e, C/A code is easily disturbed. As a result it is very hard to use the C/A code to implement the p-code acquisition. The direct acquisition of p-code has been paid attention to generate p-code and analysis its characteristic. This will have an important significance for the deep research of p-code

3、acquisitionn GPS的傳輸信號分類82.4 碼分多址123MAX+PLUS軟件開發(fā)系統(tǒng)簡介133.1 設(shè)計輸入153.2 設(shè)計項目的編譯193.3 設(shè)計校驗254 GPS信號P碼的仿真294.1 偽隨機碼的產(chǎn)生及特性分析294.2 P碼的產(chǎn)生314.3 P碼發(fā)生器仿真結(jié)果分析334.4 利用P碼進(jìn)行擴頻424.5 P碼的相關(guān)性驗證43致謝45參考文獻(xiàn)46附錄A 英文原文47附錄B 英文翻譯521 緒論1.1 GPS的發(fā)展 GPS即（Global Position System）全球n氣象資料，然后把所有觀測資料傳送到主控站以確定衛(wèi)星的精密軌道。主控站設(shè)在科羅拉多·斯平士（Colorado Springs），主控站除協(xié)調(diào)和管理整個地面監(jiān)控系統(tǒng)工作外，其主要任務(wù)包括：推算和編制各衛(wèi)星的星歷、衛(wèi)星鐘差和大氣層修正參數(shù)，并把這些數(shù)據(jù)傳送到注入站；提供GPS衛(wèi)星系統(tǒng)時間標(biāo)準(zhǔn)；調(diào)整偏移軌道的衛(wèi)星；啟用備用衛(wèi)星以代替失效的工作衛(wèi)星。注入站有三個，分別設(shè)在印度洋的迭哥加西亞（Diego Garcia）、南太平洋的卡瓦加蘭（Kwajalein）、南大西洋的阿松森島（Ascencion）。其主要任務(wù)是在主控站的控制下，將主控站推算和編制的衛(wèi)星星歷、鐘差、導(dǎo)航電文和其他控制指令注入到相應(yīng)衛(wèi)星的/*