GPS.gov: Survey & Mapping Applications
网页2022年2月10日 · To achieve the highest level of accuracy, most survey-grade receivers use two GPS radio frequencies: L1 and L2. Currently, there is no fully functional civilian signal at L2, so these receivers leverage a military L2 signal using "codeless" techniques.
GPS.gov: GPS Accuracy - GPS: The Global Positioning System
网页2022年3月3日 · The government is committed to providing GPS at the accuracy levels specified in the GPS Standard Positioning Service (SPS) Performance Standard. To calculate its position, a GPS device measures its distance (range) from multiple GPS satellites. URE is a measure of ranging accuracy.
GPS.gov: GPS Service Outages & Status Reports - GPS: The Global ...
网页2022年6月17日 · GPS Service Outages & Status Reports. For help with wrong/missing addresses, bad directions, and other mapping errors in GPS devices, please visit our page on Address, Route, & Map Problems. Go there. Experiencing GPS satellite service disruptions, degradation, or position/time anomalies?
网页Data Fuels the GIS Software Engine. -Data is the fuel of GIS. Real-time, accurate data enables quicker and more accurate decisions. -Real-time GNSS data is trending up. “Post-processed” data is fading, not just in a GNSS sense, …
GPS.gov: Performance Standards & Specifications - GPS: The …
网页GPS Standard Positioning Service (SPS) Performance Standard. This document defines the levels of performance the U.S. government makes available to users of the GPS Standard Positioning Service, also known as the civilian GPS service. Download.
GPS.gov: Education Homepage
网页2021年6月16日 · GPS-Based STEM Curriculum. In 2018, the U.S. government released a free curriculum that uses GPS concepts and activities to stimulate student interest in science, technology, engineering, and mathematics (STEM).
GPS.gov: Trilateration Exercise
网页2014年11月25日 · To teach you the basic concept of how GPS works, we will conduct an exercise to demonstrate trilateration. Trilateration is determining a position by knowing your distance from at least 3 known points. In GPS those known points are …
网页Since GPS initial operational capability (IOC) was first declared in 1993, actual GPS performance has continuously met and exceeded minimum performance levels specified in the SPS PS and users can generally expect improved performance over the minimum levels described here.
Other Global Navigation Satellite Systems (GNSS) - GPS: The …
网页2021年10月19日 · Global navigation satellite system (GNSS) is a general term describing any satellite constellation that provides positioning, navigation, and timing (PNT) services on a global or regional basis.
GPS.gov: GPS Modernization - GPS: The Global Positioning System
网页2017年11月3日 · Learn more about a specific aspect of GPS modernization: Space Segment; Control Segment; New Civil Signals; Modernized Civil Navigation (CNAV) Message; Improving GPS performance through modernization promotes the U.S. policy of maintaining leadership in the service, provision, and use of global navigation satellite …