MCSK Signal for LEO Satellite Constellation Based Navigation Augmentation System

To improving the PNT service performance with LEO navigation augmentation system has become a research hotspot in the field of satellite navigation. One of the main goals is to shorten the required convergence time of precise point positioning (PPP). In order to achieve the rapid precise point positioning, it is necessary to broadcast the dedicated LEO navigation augmentation signals. Different from the traditional GNSS signal, the LEO navigation augmentation signal needs to provide the capability of high precision continuous measurement, high data rate broadcasting at the same time. For this reason, this paper proposes a multiplexed code shift keying (MCSK) signal scheme to meet the need of LEO navigation augmentation signal, and studies the receiving method of MCSK signal. The MCSK signal adopts the code period time division multiplexing technology, which combines the code period of modulated low rate message and the code period of modulated high rate message into a single signal to achieve high-precision measurement, and high data rate broadcasting. With the help of simulation, the tracking performance and demodulation performance of MCSK signal are analyzed, and the effectiveness of MCSK signal is verified.