Mar 19, 2006Landsat 7 Tests Bumper Mode Operations

Operations of Landsat 7 in bumper mode were successfully tested over several geometric calibration sites on Mar. 3 and 19. Currently, the motion of Landsat 7’s scan mirror during imaging is controlled with the Scan Angle Monitor (SAM). However, the scan mirror assembly will wear over time and impede the instrument’s ability to synchronize the […]

Mar 16, 2006Landsat 5 TWTA Transmitter Problem Interrupts Data Acquisitions

After anĀ outgassing event, the Landsat 5 X-band transmitter prematurely shut off during a data downlink to the USGS Landsat Ground Station in Sioux Falls, SD. Specifically the backup Traveling Wave Tube Amplifier (TWTA), which is a downlink power amplifier for spacecraft telecommunications, tripped an Over Current Protection circuit. In 1987, a similar anomaly forced engineers […]

Mar 1, 2006Landsat 5 Turns 22!

Mar 1, 2006 • On this day in 1984, Landsat 5 was launched into orbit. Today, after 22 years of service, Landsat 5 is still operational. The original design life of Landsat 5 was just three years, but it has become the longest continuously operating Earth observation system in the U.S. civilian satellite fleet. Landsat […]