Iridium Losts Satellite, Globalstar Also Has Issues

It had to happen some time, and now it has. Two satellites, an operating Iridium communications satellite, and a defunct Russian satellite, collided in orbit on Feb. 10, 2009, destroying both objects and creating 500 to 600 new pieces of orbital debris, adding to about 18,000 other orbiting pieces of "space junk" softball-sized or larger that routinely are tracked. 

Iridium, which owns a fleet of 66 low-earth orbit satellites, expects minor outages, and will move an in-orbit spare into position within 30 days. 

Iridium isn't the only satellite communications provider facing at least some issues. Frost & Sullivan compared performance of more than 1,000 calls on Iridium and Globalstar networks, from Northern California and Central Texas.

In initial testing, analysts found that more than 99 percent of calls placed through the

Iridium handset were successfully connected, compared to 51.3 percent of calls from the

Globalstar handset. 

Tests also indicate that 98.1 percent of calls on the Iridium handset and 36.2 percent of calls on the Globalstar handset were successfully connected and completed without being dropped during a three-minute period.

Globalstar admits it has  a problem with duplex communications (not simplex). "As previously announced, many Globalstar satellites are experiencing an anomaly resulting in degraded performance of the amplifiers for the S-band satellite communications antenna," Globalstar says.

"The anomaly is adversely affecting two-way voice and data services," the company says. "Customer service continues to be available, but at certain times at any given location it may take substantially longer to establish calls and the duration of calls may be limited."

Until the new second-generation Globalstar satellite constellation is operational, Globalstar is offering its Optimum Satellite Availability T-tool (OSAT) on its Internet site, which subscribers may use to predict when one or more unaffected satellites will be overhead at any specific geographic location.

Globalstar has launched eight spare satellites for its existing constellation with a view to reducing the gaps in its two-way voice and data services pending commercial availability of its second-generation satellite constellation, scheduled for initial launch in the second half of 2009.