Regenerative pseudo‐noise‐like (PNL) ranging sequences for deep‐space missions

Abstract

SUMMARYSpace agencies are currently considering replacing conventional ranging systems with regenerative schemes for future demanding interplanetary missions. The Consultative Committee for Space Data Systems (CCSDS) in charge of standardization among Space Agencies is studying both Pseudo-Noise (PN) and Pseudo-Noise-Like (PNL) sequences and intends to generate a recommended standard (Blue Book) by 2007. The present paper treats the PNL schemes under consideration by CCSDS, with emphasis on the scrambled weighted-voting Stiffler PNL ranging-sequence scheme, which is proposed herein and which appears to be superior to all other PN and PNL ranging schemes.

Pseudo-Noise Ranging for Future Transparent and Regenerative Channels

“…The Stiffler PNL ranging sequences of interest for regenerative ranging are most easily generated by a n = 20-bit counter (Fig.2) followed by a majority voting on the parallel output bits 5,7 . From the method of construction, the period of Stiffler sequences is L = 2 20 = 1,048,576 chips.…”

“…The search was focused on pseudo-noise (PN) or PNlike (PNL) sequences allowing easy regeneration and fast acquisition via hardware parallelisation on-board and at the ground station. As demanded by CCSDS procedures, the investigation had to be based on theoretical analysis [5][6][7] , simulation results 8,9 and hardware tests 10,11 . Different European entities supported the ESA's work thereby providing also an internal independent evaluation prior to the international comparison.…”

Regenerative pseudo‐noise (PN) ranging sequences for deep‐space missions

“…In a companion paper [1], we will treat PN-like (PNL) ranging-sequence schemes, including the scrambled weighted-voting Stiffler [2] PNL ranging scheme, that are also under consideration by CCSDS.…”