近地飛行速度 的英文怎麼說

中文拼音 [jìndefēihángsùdù]
近地飛行速度 英文
speed near ground
  • 近 : Ⅰ形容詞1 （空間或時間距離短） near; close 2 （接近） approaching; approximately; close to 3 （親...
  • 飛 : Ⅰ動詞1 （鳥、蟲等在空中活動） fly; flit 2 （利用動力機械在空中行動） fly 3 （在空中飄浮遊動） fly...
  • 行 : 行Ⅰ名詞1 （行列） line; row 2 （排行） seniority among brothers and sisters:你行幾? 我行三。where...
  • 速 : Ⅰ形容詞（迅速; 快） fast; rapid; quick; speedy Ⅱ名詞1 （速度） speed; velocity 2 （姓氏） a surna...
  • 度 : 度動詞[書面語] （推測; 估計） surmise; estimate
  • 飛行 : flight; flying; aviate; voyage; volitate; hop
  • 速度 : 1. [物理學] velocity; speed; blast; bat 2. [音樂] tempo3. （快慢的程度） speed; rate; pace; tempo
  1. An on - line minimum - variance estimator was developed for thrust acceleration applied to orbit transfer using discrete - time radar measurements. the mass - flow - rate of propellant was selected as a state variant, which was estimated by employing an integral state model and ekf filter. the variation equations for measurement vector to mass - flow - rate have been established to linearize the discrete - time measurement equations. the algorithm has applied successfully to maneuver process in commanding satellite into geo - stationary orbit. the results show that the algorithm developed here can monitor and determine whether engine works well or failure precisely and quickly during orbit transfer process

    飛行器軌道機動過程中，為跟蹤、定位機動目標和干預機動控制過程，需要統計處理離散的雷達觀測量實時估計推進發動機的推力，進而確定飛行器的瞬時軌道參數.本文所述演算法是該工程問題的探討和解決方案.文章建立了軌道機動過程中連續變質量運動模型和離散雷達量測模型，推進發動機的質量秒耗量作為表徵推力加速度的一個近似常量，應用擴展卡爾曼濾波對離散的雷達測量數據進行順序統計處理給出秒耗量的最小方差估計;文章詳細地推導了線性化量測模型的變分方程和觀測矩陣;模擬結果表明該演算法能快速、準確地估計推進發動機的質量秒耗量和向機動目標施加的實際推力
  2. He had been crouching in the stubble, but the green field was in front of him, and there it was marshy ground. the two dogs of the groom who had started him were the nearest and the first to be on the scent after him. but they had not got near him, when ilagins black and tan yerza flew ahead of them, got within a yard, pounced on him with fearful swiftness, aiming at the hares tail, and rolled over, thinking she had hold of him

    它躺在茬地上，但是它前面有一片翠綠的田野，泥濘難行，那個發現兔子的獵人的兩只獵犬離得最近，首先盯著看了看，竄了過去，但是隔得遠，還沒有走到兔子面前，那隻伊拉金的紅花斑母犬葉爾扎忽然從後面飛奔出來，離兔子只有一隻獵犬的距離，它瞄準兔子尾巴，用最快的速度沖過去，它以為它把兔子抓住了，於是倒栽蔥似地翻了個跟頭。
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