Question
Download Solution PDFWhich of the following statements gives an INCORRECT application of GPS?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Global Positioning System (GPS)
The Global Positioning System (GPS) is a satellite-based navigation and surveying system used for the precise determination of position and time.
Key Features of GPS:
- Radio Signals: GPS uses radio signals from satellites to determine the position and time of an object on Earth.
- Space Segment: The space segment of GPS consists of 24 satellites in near-circular orbits with a 12-hour period, located at an altitude of about 20,000 km above the Earth.
- 3-D Positioning: A minimum of 4 satellites must be in view from any point on Earth at any time to provide accurate 3-dimensional positioning.
- Orbital Period: The nominal orbital period of a GPS satellite is one-half of a sidereal day, approximately 11 hours and 58 minutes.
- Orbital Characteristics: The satellites are in nearly circular orbits, equally spaced about the equator, with a separation of 60 degrees.
- Orbital Radius: The orbital radius of GPS satellites is approximately 26,600 km.
- Position Fix Time: A TRANSIT user at the equator can obtain a position fix on average every 10 minutes.
- GPS relies on signals from satellites, which cannot penetrate deep underground. Therefore, GPS is not effective for determining positions in deep, underground environments.
Last updated on May 28, 2025
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