| The signals of the multiple global satellite navigation systems are crowded in theL-band(1164-1610MHz),International Radio Union (ITU) open up the study of theS-band for the satellite navigation to the world. Making full use of the spectrum resourcescan improve the performance of the navigation system.This paper studies the problems ofthe compatibility of the assumed navigation signals on the S-band2483.5-2500MHz bandwith other system signals on the band.Firstly, giving the analysis of the signals’ compatibility, including calculating spectralseparation factor between the signalsã€throughing the space constellation constellationsimulation method to calculate the aggregate gain coefficient and calculating theequivalent carrier-to-noise ratio downgrade coefficient under the interference between thetwo systemsï¼›Secondly, throughing the analysis of the propagation characteristics of S-bandnavigation signals, corresponding mathematical model gives the corresponding link lossand link budget of the signals,in the case of the isotropic radiated power (EIRP) on thesatellite is limited, the received power of the ground signal will be affected;Finally, based on the assumed analysis conditions, gives the eight kinds of navigationsignal option on the S-band, throughing the constellation simulation results to get theaggregate gain factor, combining the compatility assessment methods, evaluating andanalyzing the compatibility of the options of the assumed navigation signals and the arearadio-determination satellite service (RDSS) system〠Globalstar system and Galileosystem on the band. According to results of the calculation shows that interfere with eachother their carrier-to-noise ratio downgrade coefficient due to the interference betweenthe options of the S-band assumped navigation signals and them does not exceed0.6dB,so they have a good compatibility.The same time，these options are available for the S-band signals downlink navigation signals’ designing to provide a useful referencevalue. |
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