較差天體測量 的英文怎麼說

中文拼音 [jiàochātiānliáng]
較差天體測量 英文
differential astrometry
  • : Ⅰ動詞1 (比較) compare 2 [書面語] (計較) dispute Ⅱ副詞(比較) comparatively; relatively; fair...
  • : 差Ⅰ名詞1 (不相同; 不相合) difference; dissimilarity 2 (差錯) mistake 3 [數學] (差數) differ...
  • : 體構詞成分。
  • : 動詞1. (測量) survey; fathom; measure 2. (測度; 推測) conjecture; infer
  • : 量動1. (度量) measure 2. (估量) estimate; size up
  • 測量 : measure; survey; gauge; meter; measurement; measuring; surveying; mensuration; metering; gauging;...
  1. Main conclusions drawn from the analyses of calculating results are as follows : ( 1 ) the microwave absorption of atmosphere gas have obvious attenuation at the wavelengths for cloud detection, thereinto, the water attenuation effect changes greatly, so the 94ghz cloud detecting radar should have water vapor attenuation correction scheme. ( 2 ) when 37ghz and 94ghz radars detect clouds, the difference between the atmosphere and cloud attenuation and the large variety of radar reflectivity conduce the intension of the radar backscatter signals change. ( 3 ) for the thin cloud layer and low water content of cloud, 37 - ghz radar backscatter signals are not as good as 94 - ghz radar, that is to say that the 94ghz radar has better capability in thin clouds detection

    本工作得出如下結論: ( 1 )大氣氣的微波吸收在雲波段產生明顯的衰減,其中水汽衰減效應變化很大;即將上的空間94ghz雲雷達必須有水汽衰減訂正方案; ( 2 ) 37ghz和94ghz雷達雲,由於大氣和雲衰減不同和雷達反射率的很大異,導致雷達回波信號強弱不同; ( 3 )對雲層薄、含水少的雲,在不計雷達參數的情況下, 37ghz雷達回波信號不如94ghz雲雷達,也就是說94ghz對薄雲有更強的探能力;對雲層厚、含水大的雲,由於強衰減的作用, 94ghz雷達回波信號小於37ghz雷達; ( 4 )從大氣衰減的不利因素方面考慮,空間94ghz雷達高層薄雲的效果最好;低層薄雲時需要考慮氣衰減訂正;因濃厚雲的強衰減作用,探其中下部的能力大大減弱,不僅要進行衰減訂正,而且要藉助其他信息來反演整個雲層的含水垂直分佈; ( 5 )為了獲得從極薄到極濃厚雲的垂直分佈探能力,未來雲雷達系統最好採用雙波長甚至三波長(如94 、 37和13ghz ) 。
  2. Finally, based on the observability analysis and error analysis, two autonomous navigation schemes for encounter phase are respectively proposed in detail. monte carlo simulations are done for the two schemes. by analyzing and comparing the simulation results, we can get the conclusion that, under the accuracy conditions provided by the instruments in existence, the position estimation accuracy for probe encountering object celestial body is 0. 42km and 0. 04km, which demonstrate the feasibility of the two navigation schemes

    最後,在可觀性分析和誤分析的基礎上,分別給出基於圖像的自主導航方法和基於視線方向及夾角的自主導航方法,並對這兩種方法進行蒙特卡羅數值模擬,通過對模擬結果的分析和比,在現有儀器的精度下,探器在與目標交會時刻的位置估計精度分別是0 . 42km和0 . 04km ,由此表明兩種自主導航方案都是可行的。
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