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5. amplitude [ P1-9 ]
B. Translate the 3rd and the 4th paragraph of lesson 26 into Chinese
C. Explain the following abbreviations
1. VOR
2. G/S
3. AM
4. FM
5. rps
READING MATERIAL
LESSON 27
VOR/ILS NAVIGATION SYSTEM (2)
VOCABULARY
1. ILS = Instrument Landing System 儀表著陸系統(tǒng)
2. precision [ pri'si n ] n. ; a. 精密(的)
3. centerline [ 'sentlain ] n. 中(心)線
4. beam [ bi:m ] 光(波、電子)束
5. array [ 'rei ] n. 陣;列
6. near [ ni ] ad ; prep. 接(鄰)近;在…近旁
7. fix [ fiks ] v. ; n. 固定;確定;不變
8. descent rate [ di'sent ][ reit ] 下降率
9. touchdown point [ 'tt'daun ][p int ] 觸地點(diǎn);著陸點(diǎn)
10. align with [ 'lain ] v. ; n. 與…成一直線;對(duì)準(zhǔn)
11. onboard [ ' nb :d ] 在機(jī)上;機(jī)載的
12. ICAO= International Civil Aviation Organization 國際民航組織
13. arrange…under categories 把…分門別類
14. category [ 'kætigri ] n. 種類;類別
15. RVR = Runway Visual Range ['vizjul] 跑道目視距離
16. in excess of [ ik'ses ] 超過
17. probability [ pr b'biliti ] n. 可能性;幾率
18. success [ sk' ses ] n. 成功
19. limitation [ limi'tein ] n. 限制;極限
20. further [ 'f:ð ] a. 進(jìn)一步的
21. objective [ b'd ektiv ] n. 客體;對(duì)象目標(biāo)
22. independent of 與…無關(guān);不依賴…的
23. megahertz (MHz) 詞頭mega 兆;百萬;10
24. dual element [ 'dju:l ][ 'elimnt ] 雙偶極子(振子)=dual dipole element
25. characteristic impedance 特性阻抗['daipoul]
[ kærikt'ristik][im'pi:dns]
26. balanced loop [ 'bælnsd][lu:p] 平衡回路
27. housing [ 'hauzi ] n. 外殼
28. metallic [ mi'tælik ] a. 金屬的
29. fin [ fin ] n. 垂直尾翼(安定面); 翅; 翼
6
30. lightning diverter strip 避雷帶
['laitni][dai'v:t][strip]
31. horizontally polarized [ 'poulraizd ] 水平極化的
32. female [ 'fi:meil ] a. 凹形(入)的;母的
33. attenuator [ 'tenjueit ] n. 衰減器
34. interference [ int'firns ] n. 干擾;影響
35. radom [ 'reidoum ] n. 雷達(dá)天線罩
36. ultra high frequency (UHF) 超高頻
['ltr] ['fri:kwnsi]
37. incoming [ 'inkmi] a. 新來的;引(輸)入的
38. director bar [ di'rekt][ba:] 指引桿;導(dǎo)向桿
39. alter [ ' :lt ] 改變;變換
40. sensitivity [ sensi'tiviti ] n. 靈敏度
41. field pattern [ fi:ld]['pætn ] 場圖(波瓣方向圖)
42. odd tenth [ d ] [ ten ] 奇數(shù)小數(shù)
43. odd number [ 'nmb ] 奇數(shù)
44. involve [ in'v lv ] vt. 包含(有);使用
45. comparison [ km'pærisn ] n. 比較
46. overlapping 原形是overlap [ouv'læp] 信號(hào)重迭(搭接)
47. lobe [ loub ] n. 波瓣
48. on-course path [ k :s ][ pa: ] 在航線上的路徑
49. strength [ stre ] n. 強(qiáng)度
50. coincide [ kouin'said ] vi. 后跟with 與…一致(符合)
51. standardize [ 'stænddaiz ] vt. 標(biāo)準(zhǔn)化;規(guī)格化
52. whenever [ hwen'ev ] ad. ; conj. 每當(dāng)…;無論何時(shí)
53. essential [ i'senl ] a. 基本的;主要的
54. displace [ dis'pleis ] vt. 位移;替換;取代
55. needle [ 'nidl ] n. 指針
TEXT
[1] The Instrument Landing System (ILS) provides precision approach guidance
during ILS approaches by giving position data relative to the glideslope and
runway centerline. The glide slope (G/S) and localizer (LOC) beams are
radiated by antenna arrays located on the ground near the runway. The G/S
provides a fixed descent rate path to the touch down point and the LOC is
aligned with the runway centerline. The onboard ILS measures vertical
deviation from the G/S beam and horizontal deviation from the LOC beam .The
ILS outputs this deviation data to interfacing system for display and
navigational use.
Fig 27-1 Instrument Landing System
[2] The International Civil Aviation Organization (ICAO) arranges the approach
conditions under categories:
 Category I ------- operation down to 60M decision height (the height above
the runway at which the pilot must be able to see to land is called the desision
height) with runway visual range (RVR) in excess of 800 M with high
probability of success.
 Category II ------- Operation down to 30M decision height with RVR in
excess of 400 M with high probability of success.
 Category III a ---- Operation with no decision height limitation to and
along the surface of the runway with external visual reference during the final
phase of landing with RVR of 200M.
　
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