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Figure 9. Plot depicting the changes in adjusted heights due to constraining all published NAVD 88 leveling-derived orthometric heights except for station Phaniel (using GEOID12B) .

Establishing orthometric heights using GNSS — Part 5

February 3, 2016  - By 0 Comments

Basic procedures and tools for ensuring GNNS-derived orthometric heights meet the project’s desired accuracy
In the latest installment of our ongoing series, the focus switches from GNSS-derived ellipsoid heights to procedures and tools for ensuring GNNS-derived orthometric heights meet the project's desired accuracy. read more

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IRNSS 1D in earlier lab testing.

System of Systems: GPS III bidding, testing

February 9, 2016  - By 0 Comments

GPS III Bidding Opens — Again The GPS Directorate at the Space and Missile Systems Center (SMC) continues to look for someone to build 22 GPS III satellites in the near future. SMC issued a request for proposals on Jan. 8, with rather complicated terms.... read more

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The U.S. Air Force plans to launch the 12th — and final — satellite in the Block IIF series of modernized GPS spacecraft this week. Originally scheduled to launch Feb. 3, the launch has been moved to Friday, Feb. 5. According to United Launch Alliance (ULA), the cause for the schedule slip was “concerns over the integrity of electrical connectors on the Atlas V booster.”

The Air Force has produced 12 IIF satellites, featuring new clocks, new civil and military signals, and other upgrades for enhanced accuracy and robustness. Currently, 31 GPS satellites are in operational service, including 11 Block IIF satellites and 20 spacecraft from previous generations.

The Air Force Second Space Operations Squadron (2SOPS) indicates that IIF-12 (SVN-70/PRN-32) will replace SVN-41/PRN-14 in the F plane, slot F1. SVN-41 will be re-phased from the F1 location to a newly defined F7 node (GLAN = 45°) once SVN-70 is set healthy.

Meanwhile, SVN-23/PRN-32 (IIA-10) will be taken out of the operational constellation before IIF-12’s launch and sent to Launch, Anomaly, Resolution, and Disposal Operations (LADO).

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“SVN-23, launched on Nov. 26, 1990, has been an ‘Iron Bird’ workhorse in the E-plane and has successfully served the world’s GPS users for over 25 years,” said Rick Hamilton, CGSIC Executive Secretariat, in an email. “This is over 18 years past its designed service life, having operationally outlasted (and, in many cases, outperformed) its peers on-orbit due to the diligent efforts of the men and women of the U.S. Air Force.”

PRN-04 is tentatively scheduled for assignment to the first of the new generation of GPS-III satellites, available for launch sometime in 2017.

Date/Site/Launch Time: Wednesday, Feb. 03, 2016, from Space Launch Complex-41 at Cape Canaveral Air Force Station, Florida. The 19-minute launch window opens at 8:38 a.m. EST, and a ULA webcast will start at 8:18 a.m. EST.

Rocket/Payload: A United Launch Alliance Atlas V 401 will launch the GPS IIF-12 mission for the U.S. Air Force.

Launch Updates: To keep up to speed with updates to the launch countdown, dial the ULA launch hotline at 1-877-852-4321 or join the conversation at www.facebook.com/ulalaunch, twitter.com/ulalaunch and instagram.com/ulalaunch; hashtags #GPSIIF12 and #AtlasV.

The Air Force's twelfth Global Positioning System (GPS) IIF satellite is encapsulated inside an Atlas V 4-meter payload fairing. (Photo: ULA)

The Air Force’s twelfth Global Positioning System (GPS) IIF satellite is encapsulated inside an Atlas V 4-meter payload fairing. (Photo: ULA)

Launch of last GPS IIF satellite shifts to Friday

The U.S. Air Force plans to launch the 12th — and final — satellite in the Block IIF series of modernized GPS spacecraft this week. Originally scheduled to launch Feb. 3, the launch has been moved to Friday, Feb. 5. According to United Launch Alliance (ULA), the cause for the schedule slip was “concerns over the integrity of electrical connectors on the Atlas V... read more

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i80-gnss-receiver-CHC-navigation

Launchpad: Mapping book, anti-drone system

February 9, 2016  - By 1 Comments

The i80 GNSS receiver computes a true triple-frequency real-time kinematic (RTK) tilted pole solution using all four worldwide and multiple regional constellations, providing a future-proof sub-centimeter RTK solution to surveyors and contractors. read more

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