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Table 1 Parameter summary of currently operational LEO constellations, that are of interest to PNT exploitation

From: Receiver architectures for positioning with low earth orbit satellite signals: a survey

Constellation

Center Frequency

Altitude[Km]

Inclination[\(^{\circ }\)]

#Sats

OrbComm

137, 138MHZ

815,785–875,740

45, 70, 108

47

Iridium

16161626MHz

625, 720

86.4

66

Globalstar

1.6, 2.5GHz

1400

52

48

  1. Based on references [3, 3, 21,22,23]