本文選題：衛(wèi)星光通信 + 小衛(wèi)星　； 參考：《哈爾濱工業(yè)大學(xué)》2017年碩士論文

【摘要】：本文針對衛(wèi)星平臺振動對捕獲概率的影響進行分析并展開研究。在超窄信標空間捕獲背景下,允許采用超窄光學(xué)信標光的激光通信終端。根據(jù)目前已有的文獻調(diào)研顯示,衛(wèi)星捕獲掃描過程中,衛(wèi)星平臺振動是決定瞄準、捕獲跟蹤過程是否穩(wěn)定的一個重要原因。然而過去研究的一般為低軌和高軌道衛(wèi)星振動對捕獲性能的影響,而對于小衛(wèi)星捕獲時振動環(huán)境惡劣,振動幅值大的情況并沒有具體研究。本文則是在小衛(wèi)星的振動環(huán)境下提出了一種針對小衛(wèi)星掃描捕獲時發(fā)生振動后的捕獲概率公式,并對此公式進行了仿真分析驗證其正確性,這是首次針對小衛(wèi)星平臺振動對捕獲概率的影響進行建模和分析,具體工作如下所示。首先介紹了衛(wèi)星光通信的發(fā)展過程,并且調(diào)研了衛(wèi)星平臺振動國內(nèi)外的研究現(xiàn)狀。詳細介紹了衛(wèi)星空間捕獲理論以及單場掃描捕獲方案,并對目前已有的捕獲概率推導(dǎo)公式做了分析研究。其次在衛(wèi)星隨機振動環(huán)境下對捕獲掃描建立理論模型。從衛(wèi)星平臺的特點出發(fā),對衛(wèi)星平臺隨機振動后的掃描捕獲過程建立方位俯仰(θh,θv)坐標系。本文假定的隨機振動在這兩個角方向上的概率服從獨立的高斯分布,此外,由于非常高的振動水平是不現(xiàn)實的,但是卻因為使推導(dǎo)更完整而被提出來。不考慮接收部分,本文以獲得捕獲成功的標準是在給定時刻指向計數(shù)器終端的方向限定的強度水平,通過對比以往的衛(wèi)星振動后的捕獲概率本文所提出的對于小衛(wèi)星振動后的捕獲概率更加具體。最后通過以上所推導(dǎo)的捕獲概率與振動水平的關(guān)系在計算機環(huán)境下進行理論仿真分析。仿真曲線分別從接收端位置、光束束散角與掃描螺距比例出發(fā)從仿真后的曲線圖可以得出掃描在不確定區(qū)域內(nèi)隨著振動水平的增大捕獲概率會有不同的變化趨勢但最后都趨于平衡。在第四章中對第三章的仿真曲線進行了蒙特卡洛仿真分析進一步證明了所推導(dǎo)的公式正確性。并通過公式推導(dǎo)得到了振動趨于零時的捕獲概率趨于1。對于大幅度的振動水平時的捕獲概率在第四章進行了重新的推導(dǎo)計算,并與第三章所推導(dǎo)的公式對比發(fā)現(xiàn)所估計的捕獲概率是可信的。本論文相比與過去的振動后捕獲概率的分析更加具體,為平臺振動后的捕獲概率分析設(shè)計了更有效的方案,在國內(nèi)首次對小衛(wèi)星掃描振動的影響進行建模分析。
[Abstract]:In this paper, the influence of satellite platform vibration on capture probability is analyzed and studied. In the background of ultra-narrow beacon space acquisition, a laser communication terminal with ultra-narrow optical beacon light is allowed. According to the existing literature research, the vibration of satellite platform is an important reason to determine whether the tracking process is stable or not in the process of satellite acquisition and scanning. However, in the past, the effects of low-orbit and high-orbit satellite vibration on the acquisition performance were generally studied. However, there was no specific study on the condition that the vibration environment was bad and the vibration amplitude was large when the small satellite was captured. In this paper, a probability formula for small satellite scanning acquisition is proposed under the small satellite vibration environment, and its correctness is verified by simulation analysis. This is the first time to model and analyze the effect of the vibration of a small satellite platform on the capture probability. Firstly, the development process of satellite optical communication is introduced, and the research status of satellite platform vibration at home and abroad is investigated. The theory of satellite space acquisition and the scheme of single field scanning acquisition are introduced in detail, and the existing formulas of acquisition probability are analyzed and studied. Secondly, the theoretical model of capture scanning is established in the environment of satellite random vibration. Based on the characteristics of the satellite platform, the azimuth (胃 h, 胃 v) coordinate system is established for the scanning acquisition process of the satellite platform after random vibration. In this paper, the probability of the random vibration in these two angular directions is assumed to be independent of the Gao Si distribution. In addition, because the very high vibration level is unrealistic, it is proposed because the derivation is more complete. Regardless of the receiving part, the criteria for obtaining success in this paper are the intensity levels defined at a given time in the direction of the counter terminal, By comparing the previous acquisition probability after satellite vibration, this paper proposes a more specific capture probability for small satellite vibration. Finally, the relationship between the capture probability and the vibration level is analyzed in the computer environment. The simulation curve is located from the receiving end, Based on the ratio of beam divergence and scanning pitch, it can be concluded from the simulation curve that the acquisition probability of scanning varies with the increase of vibration level in the uncertain region, but it tends to balance finally. In the fourth chapter, the simulation curve of chapter 3 is analyzed by Monte Carlo simulation, and the formula is proved to be correct. The acquisition probability of the vibration approaching 00:00 is obtained by formula derivation. The acquisition probability of large amplitude vibration level is recalculated in chapter 4, and compared with the formula derived in chapter 3, it is found that the estimated capture probability is credible. Compared with the previous analysis of capture probability after vibration, this paper designs a more effective scheme for the analysis of the acquisition probability after vibration of the platform, and models and analyzes the influence of small satellite scanning vibration for the first time in China.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN929.1

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