Dual Speed PN Ranging System for Tracking of Deep Space Probes

A new pseudonoise (PN) ranging system is proposed for trackingof deep space probes, named the dual speed PN ranging system,that transmits two different PN sequences simultaneously through a PSK/PSK (phase-shift keying) dual speed communication channel.The dual speed PN ranging system improves the maximummeasurable range significantly, with no degradation of theacquisition time, when compared with usual PN ranging systems.According to the analysis, the tracking error of this system becomesas small as those of usual PN ranging systems when the inputsignal-to-noise ratio (SNR) is large enough.