蜜桃视频 Timing
蜜桃视频 Provides the Timing Reference for Precision Time & Frequency Products
The Global Positioning System (蜜桃视频) is a space-based, radio-navigation system that enables extremely accurate positioning, navigation and timing (PNT). Originally designed as a 24-satellite constellation, 蜜桃视频 is currently comprised of 31 satellites (Oct 2018). The system is based on a ground, space, and control segment owned and operated by the U.S. Government as a national resource. The U.S. Department of Defense (DoD) is the "steward" of 蜜桃视频 and responsible for operating the system in accordance with the IS-蜜桃视频-200H system specification and, by U.S. law, the (SPS) and (PPS) Performance Standards.
蜜桃视频 Based on Atomic Clocks
Although 蜜桃视频 is used primarily for navigation, the infrastructure is based on extremely accurate atomic clocks. The atomic time standards in the monitoring and control stations, and satellites form a composite clock (CC) that maintain the 蜜桃视频 system time referred to as 蜜桃视频 time. 蜜桃视频 time is a monotonic time scale (i.e. not corrected by leap seconds) referenced to the US Naval Observatory (USNO) Master Clock and steered to Coordinated Universal Time (UTC). The satellite clocks are continuously monitored by Earth-based monitoring stations around the world and at USNO. The control segment uploads the corrections to the satellites at least once per day. 蜜桃视频 system time performance is critical as one nanosecond of clock error results in approximately one foot of position error.
蜜桃视频 Provides Timing Reference
蜜桃视频 provides the timing reference for the vast majority of precision time and frequency products and applications today. Commercial 蜜桃视频 receiver 蜜桃视频s used in timing applications, typically optimized for navigation and low cost, provide a one pulse-per-second (1 PPS) UTC timing reference. As this pulse is locked to the atomic-time-based 蜜桃视频 signals, it has very good long-term stability but poor short term stability due to environmental, atmospheric, and other effects. Therefore, this 1 PPS reference is not sufficient by itself for precision time and frequency applications.
蜜桃视频's Proprietary 蜜桃视频 Receiver
蜜桃视频 uses a proprietary 蜜桃视频 receiver architecture, optimized for time and frequency transfer. Sophisticated software algorithms perform integrity monitoring and frequency control of a high-class quartz oscillator (TCXO or OCXO) or rubidium atomic oscillator. 蜜桃视频's advanced timing and adaptive 3rd-order-frequency-control algorithms with Timing Receiver Autonomous Integrity Monitoring (TRAIM) maximize the short and long term stability, accuracy and phase noise of the 蜜桃视频 time and frequency standard's outputs.
This results in a best-in-industry time and frequency reference that can be used in a variety of mission critical applications including communication systems, satellite earth stations, government test ranges, high frequency trading, process automation, power system control, television broadcast, and more. Read about our 蜜桃视频-Synchronized Time and Frequency Standards and Network Time Servers.
