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We study the feasibility of a passive system for Positioning, Navigation, and Timing (PPNT) in the cislunar environment. The signal structure and position estimation procedure are inspired by the Global Positioning System (GPS), with the main difference being the makeup and location of the trans-mitters. Cislunar PNT utilizing sidelobe transmissions from GPS satellites, i.e., “weak GPS”, was studied in prior work and it was shown to achieve a one-shot estimation error between 200 and 300 meters under the assumption that the individual pseudorange errors do not exceed 5cm. In contrast, we consider a system in which a set of Earth-based transmitters continuously transmit a PN ranging signal similar in structure to the GPS signals, but in a dedicated frequency band. A receiver in cislunar space must acquire and track signals from four separate transmitters before solving for its position and time offset via …