Pseudo-Noise (PN) Ranging Systems - CCSDS

CCSDS INFORMATIONAL REPORT CONCERNING PSEUDO-NOISE RANGING SYSTEMS
PN clock tone__
Null-to-null bw ∼2.9 MHz
Figure 2-8: T4B
residual carrier
Theoretical derivations explaining the given measured spectral plots and additional
theoretical and simulated spectral plots can be found in references [7] and [15]. The
conclusions on the spectral properties for this case are:
– strong clock component at one half of the chip rate or at the clock frequency (0.5
MHz);
– continuous spectrum with nulls (except the first) at odd (n>3) multiples of the clock
frequency and faster decay relative to squarewave shaping;
– first null position function of the modulation index and equal to three times the clock
frequency (1.5 MHz) only when the modulation index is small;
– discrete component at integer even and odd multiples of the clock frequency;
– different power distribution for the PN code components for the different codes (due
to different majority voting weight).
CCSDS 414.0-G-1 Page 2-11 March 2010