31.   The ground stations will use tracking programs to compare the exact distance to a GPS satellite with the range implied by its radio signal.

32.   The linkup is to take place over Asia, where there is radio contact between Russian ground stations and all of the orbiting components.

33.   The Mir crew depends on Asian ground stations rather than on satellites to relay communications.

34.   The office administers a multi-billion-dollar array of sophisticated spy satellites and the ground stations that receive and analyze the data.

35.   The proposal for such ground stations, which would alert Israel to a Syrian military buildup on the border, have impeded negotiations because of Syrian objections.

36.   The satellite in turn relays the digital information to ground stations called teleports, which in turn are connected to the backbone of the Internet.

37.   The satellite has a unique antenna design capable of directing traffic to the ground stations that can handle traffic most efficiently.

38.   The signal for wireless pay-per-view television is transmitted to TV set-top boxes from roof antennae and regional ground stations.

39.   The successful test will permit NASA to close a venerable ground station in Bermuda, a move the space agency estimated will save it several million dollars annually.

40.   The students spoke to the space shuttle astronauts via an amateur radio ground station in San Diego, Calif., Marchant said.