航空工程英语基础（中英文对照）(41)

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Fig. 25-5 DME distance EHSI displays
EXERCISE
A. Find out the explanations of the following words in your "English-Chinese
technical dictionary"
1. nautical mile [ P1-104 ]
2. agility tuning [ P1-3 ]
B. Translate lesson 25 first paragraph into Chinese
C. Explain the following abbreviations
1. DME
2. VSWR
3. RDDMI
READING MATERIAL
LESSON 26
VOR/ILS NAVIGATION SYSTEM (1)
VOCABULARY
1. navigation [ nævi'gein ] n. 导航
2. approach [  'prout ] v. 接近; 进近
3. omnidirectional [ mnidi 'reknl ] a. 全向的;不定向的
4. accurate [ 'ækjurit ] a. 准确的;精确的
5. deviation [ di:vi ' ein ] n. 偏离(差);偏转
6. vertical [ 'v:tikl ] a. 垂直的;纵向的
7. runway [ ' rnwei ] n. 跑道
8. LOC = localizer [ louk ' laiz ] n. 航向道
9. G/S = glide slope [ glaid ] [sloup ] n. 下滑道
10. compose [ km ' pouz ] v. 组成be composed of M 由M 组成
11. comprise [ km ' praiz ] vt. 包括, be comprised of … 由…组成
12. transfer switch [ 'trænsf: ][ swit ] 转换开关
13. mode select switch [ moud ][ si'lekt ] 方式选择开关
14. VOR vector [ ' vekt ] n. 矢径;引导
15. press [ pres ] v. ; n. 按压
16. carrier [ ' kæri ] n. 载波
17. modulate [ ' m djuleit ] v. 调制
18. subcarrier [ 'sb ' kæri ] n. 副载波
19. oscillator [ ' sileit ] n. 振荡器
20. directional [ di 'reknl ] a. 定向的;有方向性的
21. rotate [ rou 'teit ] v. 转动
22. rps = revolutions per second [ rev 'lju:n ] 转数/秒
23. instant [ ' instnt ] n. 瞬间;刹那a. 立即
24. carefully [ 'kfuli ] ad. 精(仔)细地;小心地
25. coordinate [ kou ' :dinit ] v. 协调;配合;n. 坐标
26. peak [ pi:k ] n. 峰值
27. positive [ 'p zitiv ] a. 正的
28. reference signal [ 'refrns ] [ 'signl ] 基准信号
29. modulation [ m dju' lein ] n. 调制
30. AM = Amplitude modulated 调幅
31. result from [ ri' zlt ] 由…造成(得出)的结果;起因于
32. diminish [ di' mini ] v. 减弱;变小
33. variable signal [ 'vribl ][ 'signl ] 可变信号
34. waveform [ 'weivf :m ] n. 波形
35. envelope [ 'enviloup ] n. 包线(络);外壳
36. fall off [ f :l ] [ :f ] 下降;减小;衰退
37. build up [ bild ] 增加; 增长
38. exactly [ ig' zæktli ] ad. 精确地;正确地
39. fundamental [ fnd' mentl ] a. 基本的;主要的
40. compare [ km' p ] v. n. 比较;可与…相比
41. in order to 为了;以…为目的
42. discover [ dis' kv ] vt. 发现
43. phase- difference [ feiz ][' difrns ] 相位差
44. result in [ ri' zlt ] 结果形成(产生)…;导致
45. lag [ læg ] n. vi 滞后;落后
46. beyond [ bi' j nd ] prep. 超过…的范围;超出
47. with respect to 关于; 相对于; 就…而论
TEXT
[1] The VOR/ILS navigation system provides airplane position data for enroute
and for landing approach. VHF omnidirectional range (VOR) is designed to
provide accurate enroute navigation. In VOR operation, the system supplies
bearing and deviation with respect to a VOR station. The Instrument Landing
system (ILS) provides vertical and horizontal guidance when making an
approach to a runway. In ILS operation, the system supplies deviation from the
localizer (LOC) and glide slope (G/S) beams. The basic navigation system is
composed of receivers, VHF NAV control panels, and an antenna system
comprised of a glide slope antenna, a localizer antenna, and a VOR/LOC
antenna.
Fig. 26-1 VOR/ILS navigation system
[2] Figure 26-2 shows the useful portion of EFIS control panel for VOR/ILS
navigation.
Fig 26-2 EFIS control panel
The 3-position VHF NAV transfer switch is located on the pilots' overhead
panel. When the VHF NAV transfer switch in the "NORMAL" position, VHF
NAV unit-1 provides information to the captain's instruments, and VHF NAV
unit-2 provides information to the first officer's instrument. When the transfer
switch is placed in the "BOTH ON 1" or "BOTH ON 2" positions, both the
captain's and first officer's instruments are controlled by the selected VHF NAV
unit. The mode select switch provides selection of the VOR/ILS mode on the
EHSIs. The VOR/ILS mode can be displayed in FULL compass rose format or
the EXPANDED compass rose format. In the MAP or CTR MAP modes, VOR
vectors can be displayed by pressing the VOR/ADF map selection switch. The
　
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