How GPS works: Atomic clocks in space - Tài liệu học đề tự ôn tập | Đại học Hoa Sen

How GPS works: Atomic clocks in space - Tài liệu học đề tự ôn tập | Đại học Hoa Senđược sưu tầm và soạn thảo dưới dạng file PDF để gửi tới các bạn sinh viên cùng tham khảo, ôn tập đầy đủ kiến thức, chuẩn bị cho các buổi học thật tốt. Mời bạn đọc đón xem

6 3 lượt tải Tải xuống
Chia sẻ Báo cáo tài liệu

Môn: Tiếng Anh (TA8 ISW)

Trường: Đại học Hoa Sen

Thông tin:

2 trang 1 tháng trước

Tác giả:

Profile Kim Oanh
How GPS works: Atomic clocks in space
What makes GPS an always-on resource -- every bit as much
a reliable _____________ as the electricity and water in your(1)
house - is the coverage the satellites provide. There are 31
satellites in the GPS constellation, and 24 are considered the
minimum for the core constellation to work as it's supposed to.
Those two dozen are spread out in six orbital planes, so you
should always be within view of at least four at any given moment.
The remaining seven are essentially spares, to be rotated in as
necessary. Though they're continuously _____________ signals (2)
down to Earth that you'll pick up in your phone, fitness tracker or
boating sat-nav device, they don't know where you are. They just
broadcast, like a radio station in space. A GPS III satellite stands
tall at Lockheed Martin's Littleton, Colorado, facility, in May 2018, a
year and a half before its launch into orbit. The striped elements on
top are antennas, which will be pointed earthward when the
satellite is on orbit. "The GPS satellites are actually just highly
(3)_____________ atomic clocks, hooked to a radio transmitting a
time signal," says Dana Goward, president of the Resilient
Navigation and Timing Foundation, a Washington, DC-based
nonprofit. On the ground, your GPS receiver -- which is what your
iPhone or Galaxy phone is, thanks to a GPS chip -- picks up the
signals from four or more satellites. By ______________ slight(4)
differences in the signals' time of arrival, all the way down to
nanoseconds, it can calculate where you are and whether you're in
motion. "Location is a byproduct of how the system works," says
Scott Burgett, director of GNSS and software engineering at
Garmin, which makes devices including fitness trackers and
smartwatches. "All the satellites transmit signals, and they're
(5)_____________ pretty accurately, but in order to actually get
your position information, you have to solve for time."
1. A. Utility B. Applicability C. Function D. Advantage
2. A. Transmitting B. Emitting C. Radiating D. Beaming
3. A. Precautious B. Precise C. Prelactic D. Predaceous
4. A. Measuring B. Rating C. Appraising D. Calculating
5. A. Harmonized B. Corresponded C. Synchronized D. Coincided
Source: https://www.cnet.com/science/features/gps-rules-
everything-a-new-satellite-launch-keeps-its-big-upgrade-rolling/
-
| 1/2
| | Tải xuống

Có thể bạn quan tâm:

Preview text:

How GPS works: Atomic clocks in space
What makes GPS an always-on resource -- every bit as much
a reliable (1)_____________ as the electricity and water in your
house - is the coverage the satellites provide. There are 31
satellites in the GPS constellation, and 24 are considered the
minimum for the core constellation to work as it's supposed to.
Those two dozen are spread out in six orbital planes, so you
should always be within view of at least four at any given moment.
The remaining seven are essentially spares, to be rotated in as
necessary. Though they're continuously (2)_____________ signals
down to Earth that you'll pick up in your phone, fitness tracker or
boating sat-nav device, they don't know where you are. They just
broadcast, like a radio station in space. A GPS III satellite stands
tall at Lockheed Martin's Littleton, Colorado, facility, in May 2018, a
year and a half before its launch into orbit. The striped elements on
top are antennas, which will be pointed earthward when the
satellite is on orbit. "The GPS satellites are actually just highly
(3)_____________ atomic clocks, hooked to a radio transmitting a
time signal," says Dana Goward, president of the Resilient
Navigation and Timing Foundation, a Washington, DC-based
nonprofit. On the ground, your GPS receiver -- which is what your
iPhone or Galaxy phone is, thanks to a GPS chip -- picks up the
signals from four or more satellites. By (4)______________ slight
differences in the signals' time of arrival, all the way down to
nanoseconds, it can calculate where you are and whether you're in
motion. "Location is a byproduct of how the system works," says
Scott Burgett, director of GNSS and software engineering at
Garmin, which makes devices including fitness trackers and
smartwatches. "All the satellites transmit signals, and they're
(5)_____________ pretty accurately, but in order to actually get
your position information, you have to solve for time."
1. A. Utility B. Applicability C. Function D. Advantage
2. A. Transmitting B. Emitting C. Radiating D. Beaming
3. A. Precautious B. Precise C. Prelactic D. Predaceous
4. A. Measuring B. Rating C. Appraising D. Calculating
5. A. Harmonized B. Corresponded C. Synchronized D. Coincided
Source: https://www.cnet.com/science/features/gps-rules-
everything-a-new-satellite-launch-keeps-its-big-upgrade-rolling/ -