Research on weak navigation signal acquisition technique via frequency stability transfer

摘要

Global satellite navigation system (GNSS) is the most commonly used navigation and positioning system for its superior performance and low cost of the terminal receiver. However, in some scenarios, when the navigation signal is obscured or interfered, GNSS may lose its superior performance, even becomes unusable. Extending the integration time is a general way to enhance the receivers' usability. Commonly, this method requires assistance data from somewhere else, a ground wireless sensor network as an example, and a stable oscillator. In this paper, we try to remove such assistance restricts. With some acceptable assumptions, we can calculate the frequency instability of the GNSS receiver's reference oscillator. Thus we can extend the integration time by the application of this frequency stability transfer strategy and finally acquired the weak navigation signals.