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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 仪表着陆系统
2. precision [ pri'si n ] n. ; a. 精密(的)
3. centerline [ 'sentlain ] n. 中(心)线
4. beam [ bi:m ] 光(波、电子)束
5. array [ 'rei ] n. 阵;列
6. near [ ni ] ad ; prep. 接(邻)近;在…近旁
7. fix [ fiks ] v. ; n. 固定;确定;不变
8. descent rate [ di'sent ][ reit ] 下降率
9. touchdown point [ 'tt'daun ][p int ] 触地点;着陆点
10. align with [ 'lain ] v. ; n. 与…成一直线;对准
11. onboard [ ' nb :d ] 在机上;机载的
12. ICAO= International Civil Aviation Organization 国际民航组织
13. arrange…under categories 把…分门别类
14. category [ 'kætigri ] n. 种类;类别
15. RVR = Runway Visual Range ['vizjul] 跑道目视距离
16. in excess of [ ik'ses ] 超过
17. probability [ pr b'biliti ] n. 可能性;几率
18. success [ sk' ses ] n. 成功
19. limitation [ limi'tein ] n. 限制;极限
20. further [ 'f:ð ] a. 进一步的
21. objective [ b'd ektiv ] n. 客体;对象目标
22. independent of 与…无关;不依赖…的
23. megahertz (MHz) 词头mega 兆;百万;10
24. dual element [ 'dju:l ][ 'elimnt ] 双偶极子(振子)=dual dipole element
25. characteristic impedance 特性阻抗['daipoul]
[ kærikt'ristik][im'pi:dns]
26. balanced loop [ 'bælnsd][lu:p] 平衡回路
27. housing [ 'hauzi ] n. 外壳
28. metallic [ mi'tælik ] a. 金属的
29. fin [ fin ] n. 垂直尾翼(安定面); 翅; 翼
6
30. lightning diverter strip 避雷带
['laitni][dai'v:t][strip]
31. horizontally polarized [ 'poulraizd ] 水平极化的
32. female [ 'fi:meil ] a. 凹形(入)的;母的
33. attenuator [ 'tenjueit ] n. 衰减器
34. interference [ int'firns ] n. 干扰;影响
35. radom [ 'reidoum ] n. 雷达天线罩
36. ultra high frequency (UHF) 超高频
['ltr] ['fri:kwnsi]
37. incoming [ 'inkmi] a. 新来的;引(输)入的
38. director bar [ di'rekt][ba:] 指引杆;导向杆
39. alter [ ' :lt ] 改变;变换
40. sensitivity [ sensi'tiviti ] n. 灵敏度
41. field pattern [ fi:ld]['pætn ] 场图(波瓣方向图)
42. odd tenth [ d ] [ ten ] 奇数小数
43. odd number [ 'nmb ] 奇数
44. involve [ in'v lv ] vt. 包含(有);使用
45. comparison [ km'pærisn ] n. 比较
46. overlapping 原形是overlap [ouv'læp] 信号重迭(搭接)
47. lobe [ loub ] n. 波瓣
48. on-course path [ k :s ][ pa: ] 在航线上的路径
49. strength [ stre ] n. 强度
50. coincide [ kouin'said ] vi. 后跟with 与…一致(符合)
51. standardize [ 'stænddaiz ] vt. 标准化;规格化
52. whenever [ hwen'ev ] ad. ; conj. 每当…;无论何时
53. essential [ i'senl ] a. 基本的;主要的
54. displace [ dis'pleis ] vt. 位移;替换;取代
55. needle [ 'nidl ] n. 指针
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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航空工程英语基础（中英文对照）(43)
