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NPOESS' Key to Low Data Latency: SafetyNetTM
Michael L. Jamilkowski, Raytheon Intelligence and Information Systems, Silver Spring, MD; and G. Cook, D. G. Lubar, and P. Azarewicz
A key feature of the National Polar-orbiting Operational Environmental Satellite System (NPOESS) is the Northrop Grumman Space Technology patent-pending data collection architecture known as ‘SafetyNetTM‘. The centerpiece of SafetyNetTM is the system of fifteen globally-distributed ground receptors developed by Raytheon Company. These receptors or antennae will collect up to five times as much environmental data approximately four times faster than current polar-orbiting weather satellites. Once collected, these data will be forwarded near-instantaneously to U.S. weather centrals via global fiber optic network for processing and production of data records for use in environmental prediction models.
Key system design factors:
The NPOESS SafetyNetTM architecture provides:
o Frequent downlinks and maximizes contact duration (>100% margin) at low cost,
o Downlink bandwidth margin that allows all Stored Mission Data to be down linked to two separate receptors and
o Minimal latency impacts from loss of multiple ground receptors.
Other notable characteristics of SafetyNetTM:
o Simple, receive-only, Ka Band receptor design provides autonomous operations
o Fifteen locations in ten countries; full-motion to track polar satellites
o Reliable and timely collection, delivery and processing of quality data
o 75% of NPOESS data products delivered to the US's weather centrals within 15 minutes; the rest in under 30 minutes
Presentation will show:
• A graphic of SafetyNetTM within the NPOESS program architecture
• A depiction of the NPOESS data download scheme
• A map of the worldwide SafetyNetTM receptor locations
• A graph of the percent of NPOESS Environmental Data Records (EDRs) versus time from observation to delivery
• A example chart of the NPOESS data downlink patterns to SafetyNetTM receptors
• Example photos of SafetyNetTM receptor antennae and radomes
Poster Session 1, 4th NPOESS Symposium Poster Session
Tuesday, 22 January 2008, 9:45 AM-11:00 AM, Exhibit Hall B
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