"A satellite navigation or satnav system is a system that uses satellites to provide autonomous geopositioning."
The use of GPS to locate and navigate farm equipment.
Satellite orbits: Understanding the mechanics and characteristics of satellite orbits and how they relate to GNSS signals.
Positioning techniques: Different techniques for determining a receiver’s position using GNSS signals, including single-point positioning, differential positioning, and Real-time Kinematic (RTK).
GNSS signal structure: Understanding the structure of GNSS signals, including the various types of modulation and the data carried by the signals.
Error sources: Sources of error that can affect GNSS positioning accuracy, including atmospheric effects, multi-path, signal interference, and clock errors.
GPS/GNSS receivers: Understanding different types of GPS/GNSS receivers and their capabilities, such as single- and dual-frequency receivers and their capability to support real-time differential corrections.
GNSS antennas: Understanding GNSS antennas, their characteristics, and how they affect positional accuracy.
Differential correction techniques: Methods for improving positioning accuracy through differential correction, including GPS and GNSS-based techniques.
GNSS data post-processing: Understanding post-processing software for GNSS data, including its benefits and limitations.
GNSS applications: The wide range of applications for GNSS technology, including precision agriculture, surveying, mapping, and navigation.
Precision agriculture: Specific application of GNSS technology in agriculture, enabling farmers to make more informed decisions when selecting seeds, managing water, and fertilizer resources.
GPS (Global Positioning System): GPS is one of the most widely used GNSS systems. It was developed by the US Department of Defense and has been in operation since the 1970s. It uses a network of 24 satellites to provide real-time location and timing information to receivers on the ground.
GLONASS (Global Navigation Satellite System): GLONASS is a GNSS system developed by the Russian Federation. It was launched in the 1980s and has been in operation since the 1990s. It consists of a network of 24 satellites that provide real-time location and timing information to receivers on the ground.
Galileo: Galileo is a GNSS system developed by the European Union. It consists of a network of 30 satellites that provide real-time location and timing information to receivers on the ground. Galileo is intended to provide an alternative to GPS and GLONASS.
BeiDou: BeiDou is a GNSS system developed by the People's Republic of China. It consists of a network of 35 satellites that provide real-time location and timing information to receivers on the ground. BeiDou is intended to provide an alternative to GPS and GLONASS.
"A satellite navigation system with global coverage is termed global navigation satellite system (GNSS)."
"As of 2023, four global systems are operational."
"The United States' Global Positioning System (GPS), Russia's Global Navigation Satellite System (GLONASS), China's BeiDou Navigation Satellite System, and the European Union's Galileo."
"Yes, there are regional navigation satellite systems in use."
"Japan's Quasi-Zenith Satellite System (QZSS)."
"A GPS satellite-based augmentation system to enhance the accuracy of GPS."
"The Indian Regional Navigation Satellite System (IRNSS) or NavIC."
"Satellite navigation allows satellite navigation devices to determine their location (longitude, latitude, and altitude/elevation) to high precision using time signals transmitted along a line of sight by radio from satellites."
"These uses are collectively known as Positioning, Navigation, and Timing (PNT)."
"Yes, satnav systems operate independently of any telephonic or internet reception, though these technologies can enhance the usefulness of the positioning information generated."
"Global coverage for each system is generally achieved by a satellite constellation of 18–30 medium Earth orbit (MEO) satellites spread between several orbital planes."
"All use orbital inclinations of >50°."
"Orbital periods of roughly twelve hours."
"An altitude of about 20,000 kilometers or 12,000 miles."
"To provide autonomous geopositioning."
"To high precision (within a few centimeters to meters)."
"For providing position, navigation, or for tracking the position of something fitted with a receiver (satellite tracking)."
"The signals also allow the electronic receiver to calculate the current local time to a high precision, which allows time synchronization."
"These technologies can enhance the usefulness of the positioning information generated."