Communication method based on low-orbit mobile communication satellite

Abstract

The invention provides a communication method based on a low-orbit mobile communication satellite. A security positioning and timing (SPT) low-orbit mobile communication satellite signal is generated,and communication is conducted. The signal is characterized in that as for a time domain structure, the communication satellite signal adopts a time division multiplexing system in a time domain; asfor a frequency domain structure, the communication satellite signal adopts a frequency division multiplexing system in a frequency domain; the communication satellite signal adopts a multi-beam and multicolor multiplexing system, each beam uses one or more sub-bands as needed, and meanwhile multicolor multiplexing of the adjacent beams is met so as to lower interference between the beams; at least one of the sub-bands in the communication satellite signal is used for broadcasting a paging channel (PCH) signal; and the sub-bands, except the sub-bands for broadcasting the PCH signal, of the communication satellite signal can be used for a broadband spread spectrum SPT signal, and the SPT signal is broadcasted in N(PCH) time slots of PCH signal broadcasting. A communication navigation fusionSPT signal system is designed, and thus the positioning timing and anti-interference capacity are improved.

Description

technical field [0001] The invention belongs to the field of satellite navigation, and mainly relates to a communication method for low-orbit mobile communication satellite signals based on anti-jamming safe positioning and time service. Background technique [0002] With the development of the Global Navigation Satellite System (GNSS), the basic pattern of the four major GNSSs has been formed. GNSS-based applications have gradually penetrated into all aspects of national economic life and become an indispensable national infrastructure. At the same time, the inherent "vulnerability" of GNSS signals, such as low signal landing power, susceptibility to interference, and spoofing, has aroused widespread concern. [0003] At present, domestic and foreign low-orbit satellite constellations are booming. Low-orbit satellites have the natural advantage of low orbits, and the signal landing power limit is higher than that of GNSS signals, which can make up for the "vulnerability" o...

AI Technical Summary

Problems solved by technology

The iGPS patent uses the idle communication service channel to broadcast narrowband PRN, and the positioning and timing function is not guaranteed; the STL signal is an improvement on the original one-way time slot of Iridium. It is a narrowband pulse spread spectrum signal and its own anti-interference ability is limited.

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