GPS Accuracy and Functionality

This lecture covers the fundamentals of the Global Positioning System (GPS), including its three main segments: space, control, and user. It explains how GPS determines locations using satellite signals and discusses factors that can cause inaccuracies, such as atmospheric delays and multipath errors. The lecture also explores methods to improve GPS accuracy, including differential GPS and the Wide Area Augmentation System (WAAS).

Which of the following is NOT a segment of the GPS system?

• Space segment

• Control segment

• User segment

• Satellite segment

What is the primary function of the GPS control segment?

• To provide GPS services to users

• To launch new satellites

• To track and monitor GPS satellites

• To manufacture GPS devices

How does a GPS receiver determine its position?

• By calculating the Earth's rotation

• By measuring the distance to satellites

• By using a map

• By using a compass

What is the role of atomic clocks in GPS satellites?

• To store satellite data

• To provide accurate timing for signal transmission

• To communicate with ground stations

• To power the satellite

Which type of GPS receiver is used for precise surveying applications?

• Recreational grade

• Survey grade

• Mapping grade

• Consumer grade

What is a common cause of inaccuracy in GPS signals?

• High temperatures

• Atmospheric delay

• Low battery

• Strong winds

What is the purpose of Differential GPS?

• To reduce the cost of GPS devices

• To increase the speed of GPS signals

• To provide entertainment

• To improve GPS accuracy by using a known location

How does the Wide Area Augmentation System (WAAS) enhance GPS accuracy?

• By reducing the size of GPS devices

• By offering free GPS services

• By increasing the number of satellites

• By providing signal corrections through ground stations

Which of the following is NOT a method to improve GPS accuracy?

• Differential GPS

• Wide Area Augmentation System

• Increasing satellite speed

• Using a base station

What is the main takeaway regarding GPS accuracy?

• GPS does not require any corrections

• GPS accuracy can be affected by various factors

• GPS is always 100% accurate

• GPS is only used for military purposes