JPL sequence

JPL sequences or JPL codes consist of two linear feedback shift registers (LFSRs) whose code sequence lengths La and Lb must be prime (relatively prime).[1] In this case the code sequence length of the generated overall sequence Lc is equal to:

It is also possible for more than two LFSRs to be interconnected through multiple XORs at the output for as long as all code sequence lengths of the individual LFSR are relatively prime to one another.

JPL sequences were originally developed in the Jet Propulsion Labs, from which the name for these code sequences is derived.

Areas of application include distance measurements utilizing spread spectrum signals for satellites and in space technology. They are also utilized in the more precise military P/Y code used in the Global Positioning System (GPS).[2]

See also

References
  1. Goiser, Alois M. J. (1998). "4.3.1 JPL-Folgen" [JPL sequences]. Handbuch der Spread-Spectrum Technik [Handbook of the spread-spectrum technique] (in German) (1 ed.). Vienna, Austria: Springer Verlag. pp. 151–152. ISBN 3-211-83080-4.
  2. IS-GPS-200. GPS Public Interface Control Working Group.
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