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The short-pulse TDMA signal is an excellent solution to the near-far problem in the pseudolite augmentation systems, and the pulse duty cycle is an important element in the solution. This paper aims at designing the duty cycle of the pseudolite pulse signals with a theoretical method. At first, the scope of the duty cycle is derived theoretically with the object of ensuring the reception of both the pseudolite signals and the satellite signals, and the expression for the theoretical upper limit is given. Then based on the proposed expression, the duty cycles of Galileo pseudolite pulse signals are designed. The theoretical upper limit can guide the design of the short-pulse TDMA pseudolite signals.pseudolite, short-pulse, TDMA, duty cycle

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