FEI-Zyfer offers advanced GPS Time and Frequency Distribution products, which are designed to provide precise time and frequency synchronization for a variety of critical applications. Here are the key details about FEI Zyfer’s offerings in this area:
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Purpose and Functionality:
- Purpose: These products are designed to distribute accurate time and frequency signals derived from GPS satellites to ensure synchronized operations across various systems.
- Functionality: They receive GPS signals and use them to generate precise timing and frequency references, which can be distributed to multiple devices and systems within a network.
Applications:
- Telecommunications: Synchronize network operations, ensuring efficient data transmission and minimizing latency.
- Defense and Aerospace: Provide reliable timing for navigation, communication, radar, and other critical military systems.
- Broadcasting: Ensure accurate timing for signal transmission, crucial for coordinating broadcast networks.
- Power Utilities: Synchronize operations within power grids, improving reliability and efficiency.
- Financial Services: Provide precise time-stamping for transactions, ensuring regulatory compliance and accuracy in trading systems.
Key Products and Features
Time and Frequency References: Includes multiple output formats for compatibility with various systems, low phase noise, and high frequency stability. It also offers holdover capabilities to maintain accuracy during GPS outages.
GPS Disciplined Oscillators (GPSDOs): Offers high precision and stability, rapid acquisition of GPS signals, and robust performance in harsh environments. These products also include multiple output options and are designed for easy integration into existing systems.
Time and Frequency Distribution Systems: Includes redundant power supplies and GPS receivers for increased reliability, multiple output formats, and network management capabilities to monitor and control the system remotely.
Benefits
High Precision and Stability: FEI Zyfer’s products deliver exceptional time and frequency accuracy, essential for applications requiring precise synchronization.
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Reliability: Designed to operate in challenging environments and provide continuous service even during GPS outages, thanks to integrated holdover capabilities.
GNSS Positioning in difficult environments
When a GNSS receiver is connected to at least 4 GNSS satellites it can calculate its position (longitude, latitude, height). By using corrections, such as RTK, GNSS receivers can further enhance their accuracy to centimeter level. Still, the more satellites a receiver “sees” the more reliable is its accurate positioning, and the more chance it has to provide positions even in challenging environments.
On a working site, the view of the sky is often partially blocked by machinery, buildings, rocks, or foliage. This means that the number of usable satellites significantly drops. Multi-frequency GNSS receivers which track all the signals from all possible satellite systems, “see” as many satellites as possible, which helps them to be robust in such challenging conditions.
What if the view of the sky is completely obstructed, such as under bridges or under thick foliage? A GNSS/INS system can use an inertial sensor to calculate relative position to the last known GNSS position, filling in the blanks during a temporary GNSS outage.
What are the advantages of using a multi-frequency GNSS receiver?
On top of robust performance in difficult environments there are other advantages of a receiver having access to more GNSS frequencies.
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- Removal of ionospheric errors: The main distinguishing factor between single and dual (or multi) frequency receivers is the higher accuracy which can be achieved by removing the first-order ionospheric errors. Charged particles in the ionosphere disturb and delay GNSS signals. When the receiver has access to two or more signals from the same satellite it can remove all major ionospheric errors, bringing stand-alone accuracy from several meters down to a single meter. Read more about IONO+ ionospheric disturbance mitigation.
- Radiofrequency interference robustness: Interference happens when other signals on the same frequency overpower GNSS signals. Interference can be caused by radio amateurs or by neighboring electronic devices and it usually effects one of the GNSS frequencies at a time. Using signals on multiple frequencies allows the receiver to switch to another frequency if interference on one frequency is detected. Read more about Advanced Interference Mitigation & Monitoring technology.
- Better multipath rejection: The L1 signal, which is used in single frequency receivers is susceptible to multipath. Multipath is the distortion of direct line-of-sight signals as they are contaminated by identical signals reflected from objects such as buildings, cars or trees. New GNSS signals such as GPS L5, Galileo L1BC and particularly Galileo E5-AltBoc are inherently more robust to multipath, so a receiver using these signals will suffer less from multipath errors. Additionally, Septentrio multi-frequency GNSS receivers incorporate advanced APME+ algorithms for the highest level of multipath resilience.
- Better accuracy: Having access to many satellites creates redundancy, which enables a statistical analysis of the satellites and their signals. Having such statistical information allows the receiver to detect and remove accidental faults of ranging signals for improved positioning accuracy.
- Compatibility with RTK networks: Being able to receive all GNSS signals makes a receiver fully compatible with all RTK networks, since RTK corrections are provided for a certain signal. For example, an RTK network might provide corrections on E5b and not E5a.
- Fast RTK Fix and heading initialization: For single frequency receivers it can take up to several minutes to have an RTK fix, which is the most precise positioning accuracy possible with RTK. If a receiver can track and use multiple signals, the convergence time to get positioning and heading (dual-antenna receivers) is decreased to several seconds. This is especially important in challenging environments where positioning might be occasionally lost and needs to be reacquired quickly.
- Additional GPS or GNSS spoofing detection: Receivers that make use of multiple frequencies can use these frequencies for additional spoofing checks. By comparing range (distance to satellite) information from various signals, anomalies can be detected and flagged. Find out more about Read more about Advanced Anti-Spoofing Protection for GNSS and GPS receivers and explore the topic more in depth through this popular article: What is GNSS Spoofing and How to Ensure GPS / GNSS Security.
Related content:
- Insight article: GNSS corrections demystified
- Insight article:What is Spoofing and How to Ensure GPS Security
- Webinar: Corrections services demystified
- Webinar: Building New Realities with GNSS-INS
- Webinar: GNSS hacking, from satellite signals to hardware/software cybersecurity
- Brochure: GNSS Interference: counteracting jamming and spoofing