High dynamic gnss carrier signal tracking method and system

Abstract

The invention provides a high-dynamic GNSS carrier wave signal tracking method. A time frequency image can simultaneously combine a time domain and a frequency domain to analyze a signal. On a principle, a contradiction between a frequency resolution and a time resolution is balanced and signal nondeterminacy caused by high dynamic is limited in several pixels. Therefore, different from a traditional tracking method, a dynamic tracking ability in the invention is not limited by a loop band width so that a receiver can track a super high dynamic carrier wave signal, and a usage scope of a GNSS receiver based on Big Dipper / GPS is expanded.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a high dynamic GNSS carrier signal tracking method and system. Background technique [0002] GNSS (Global Navigation Satellite System) is the Global Navigation Satellite System. A satellite navigation receiver acquires and tracks the signals of multiple GNSS satellites and then demodulates the navigation data modulated therein. The satellite navigation receiver uses the ranging code to calculate the relative distance between the GNSS satellite and the user, uses the ephemeris data in the navigation data to solve the satellite position and time model, and then calculates the user's position. [0003] Navigation using GNSS signals (such as GPS (Global Positioning System), Beidou, GLONASS (Global Satellite Navigation System), etc.) has been widely used in space low-orbit satellites, missiles, and ground targets. When the carrier is running in an environment with high ...

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Problems solved by technology

Therefore, no matter relying on the traditional tracking method in the frequency domain or the vector tracking method in the time domain, because only the tracking in a single domain is considered, the uncertainty of signal estimation will affect the tracking performance;

[0007] (2) Difficulty in accurate detection of dynamic level: Whether relying on the frequency estimation in the loop or the IMU in the strapdown inertial navigation system, there is a problem that the carrier Doppler change rate cannot be estimated accurately and in real time, which affects the reception The tracking accuracy of the machine to the GNSS signal;

[0008] (3) The design of the tracking loop is complex: the existing high dynamic tracking method, or the order of the tracking loop is high, the amount of calculation is large, or it is greatly affected by the error of the IMU, and error compensation needs to be performed at any time, so the design of the loop very complicated

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