139
NOUS72 KNES 181619
ADMNES
UPDATE #2: OPERATIONS WAS ABLE TO RECOVER THE S-NPP SPACECRAFT TO A VALID
GPS TIMING AND GEOLOCATION STATE ON JUL 16. CAL/VAL TEAMS HAVE CONFIRMED
THAT S-NPP SCIENCE PRODUCTS ARE MEETING MISSION SPECIFICATIONS AND READY
FOR OPERATIONAL USE.


S-NPP SCIENCE PRODUCTS WILL BE ENABLED ON PDA OPS AT 16:30 UTC ON JULY 18,
2024. SCIENCE DATA AFTER 16:30 UTC ON JULY 18, 2024 WILL MEET MISSION
SPECIFICATIONS. HIGH RATE DATA (HRD) WILL BE ENABLED AT THE END OF REV
#65934 AT 17:03 UTC ON JULY 18, 2024. DIRECT BROADCAST (DB) USERS CAN USE
THE EQUIVALENT S-NPP SCIENCE COMMUNITY SATELLITE PROCESSING PACKAGE (CSPP)
LEO PRODUCTS FOR OPERATIONS.


THIS CONCLUDES THE S-NPP GPS SPACECRAFT ANOMALY.


UPDATE #1:  THE SPACECRAFT RECOVERY ACTIVITIES PERFORMED THUS FAR ON THE S-
NPP SPACECRAFT DID NOT RESOLVE THE DEGRADATION OF THE S-NPP SCIENCE
PRODUCTS SEEN FOLLOWING THIS ANOMALY. ENGINEERING IS WORKING WITH THE
SPACECRAFT VENDOR TO DEVELOP A PLAN FOR A PATH FORWARD.


S-NPP SCIENCE DATA WILL REMAIN DISABLED FROM PDA OPS AND THROUGH HRD UNTIL
FURTHER NOTICE.


THE NOAA-21 AND NOAA-20 SATELLITES WILL CONTINUE TO PROVIDE JPSS SCIENCE
DATA NEEDS AS THE PRIMARY AND SECONDARY SATELLITES, RESPECTIVELY.


*TOPIC:* GPS INVALID ON S-NPP SPACECRAFT



*DATE/TIME ISSUED:* JULY 18, 2024  1611Z



*PRODUCT(S) OR DATA IMPACTED:* ALL S-NPP SCIENCE DATA PRODUCTS



*DATE/TIME OF INITIAL IMPACT:* JULY 09, 2024 2146Z



*DATE/TIME OF EXPECTED END TIME:*   TBD



*LENGTH OF EVENT:* TBD



*DETAILS:* STARTING ON JULY 09 AT ~2146Z , THE GPS RECEIVER ON THE S-NPP
SPACECRAFT TOGGLED TO INVALID CAUSING THE GEOLOCATION OF ALL OBSERVED DATA
TO BE INACCURATE AND OUT OF THE MISSION SPECIFICATIONS. ENGINEERING HAS
STARTED PLANNING THE EXECUTION OF THE RESET OF THE GPS UNIT ON THE S-NPP
SPACECRAFT. THE ANTICIPATED RESET OF THE GPS UNIT IS EXPECTED NO EARLIER
THAN JULY 12, 2024.

ALL PDA OPS SUBSCRIPTIONS FOR ALL S-NPP SCIENCE PRODUCTS WILL BE DISABLED
AT 1630Z  ON JULY 10, 2024.

S-NPP HIGH RATE DATA (HRD) WILL BE DISABLED ON JULY 10 AT 1743Z  FOR ALL
SCIENCE PRODUCTS.

THE NOAA-21 AND NOAA-20 SATELLITES WILL CONTINUE TO PROVIDE JPSS SCIENCE
DATA NEEDS AS THE PRIMARY AND SECONDARY SATELLITES, RESPECTIVELY.



*CONTACT INFORMATION FOR FURTHER INFORMATION:* ESPC OPERATIONS AT
ESPCOPERATIONS@NOAA.GOV AT 301-817-3880



*WEB SITE(S) FOR APPLICABLE INFORMATION:* N/A



THIS MESSAGE WAS SENT BY ESPC.NOTIFICATION@NOAA.GOV. YOU HAVE BEEN SENT
THIS AND OTHER NOTIFICATIONS BECAUSE YOU HAVE OPTED IN TO RECEIVE IT. IF
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