Method for generating dual-frequency low-orbit satellite-based satellite navigation augmentation signal

Abstract

The invention discloses a method for generating a dual-frequency low-orbit satellite-based satellite navigation augmentation signal. For the disadvantages that the power of a transmitting signal of ahigh-orbit satellite navigation augmentation system is large, the power of a signal reaching the ground is small, a ground station is complex, the communication of a ground-based augmentation system is limited, frameworks are not unified, the concurrence pressure is large, and the maintenance cost is high, the method for generating the dual-frequency low-orbit satellite-based satellite navigationaugmentation signal is proposed. The method is mainly designed and implemented for low-orbit satellite-based satellite navigation augmentation equipment, the low-orbit satellite-based satellite navigation augmentation equipment is composed of a main control extension and a transmitting extension, the main control extension can receive a GNSS satellite navigation signal to complete orbit calculation and extrapolation, star clock taming, telegraph text framing and injection, the transmitting extension performs spread spectrum modulation on a telegraph text and a spread spectrum code, the dual-frequency satellite navigation augmentation signal is generated by designing two sets of transmitting frequencies, the cost is low, the power consumption is low, and the higher positioning precision ofthe satellite navigation augmentation signal is provided.

Description

technical field [0001] The invention relates to the field of satellite navigation and positioning, in particular to a method for generating dual-frequency satellite-borne satellite navigation enhanced signals. Background technique [0002] Satellite navigation and navigation technology has been used in the field of unmanned autonomous vehicles, and the low-orbit satellite-based satellite navigation augmentation system is a particularly critical technical support. The ground-based augmentation system (CORS) represented by VRS technology has many technical defects, such as limited communication, inconsistent framework, high concurrency pressure, and high maintenance costs. Compared with the high-orbit satellite navigation augmentation system represented by the geosynchronous earth orbit, the low-orbit satellite-based satellite navigation augmentation system requires a much smaller satellite navigation augmentation downlink signal power, and the downlink signal power reaching t...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the complex system, high cost, and large transmission power required by the satellite-borne satellite augmentation system, which are caused by the need for the ground station to regularly note the satellite navigation system correction parameters in the high-orbit satellite-based satellite navigation augmentation system. The path is too far to reach the ground and the signal power is low. In order to solve the shortcomings of the ground-based augmentation system, such as limited communication, inconsistent framework, high concurrency pressure, and high maintenance costs, a miniaturized, low-power dual-frequency low-orbit satellite-based satellite is proposed. Navigation Enhancement Device Design

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