Satellite beacon signal demodulation method and device, receiving method and device

Abstract

A method for demodulating a satellite beacon signal, comprising the steps of: performing frequency conversion processing on an input signal according to a feedback beacon frequency deviation signal, so that its frequency deviation tends to zero indefinitely; performing first-time filtering and down-sampling processing on the signal; Adjust the amplitude of the signal; perform second filtering and down-sampling processing on the signal; calculate the beacon power of the signal and judge the locking state of the power. A satellite beacon signal demodulation device is characterized in that it includes a frequency converter module, a first filter module, a digital automatic gain amplifier module, a second filter module, an energy estimation module, and a frequency estimation module connected in sequence. The digital closed-loop circuit feedback mechanism and multi-stage digital filter structure are used to realize beacon signal demodulation with high dynamic range and high sensitivity, adapting to large beacon frequency deviation, and at the same time, the demodulated output beacon power refresh rate is fast and stable High, suitable for more types of satellite scenarios, such as communication in motion and communication in stillness.

Description

technical field [0001] The invention relates to a single-carrier demodulation technology for satellite communication equipment, in particular to a high-precision satellite beacon signal demodulation method and device, and a receiving method and device that adapt to large frequency deviations. Background technique [0002] The beacon signal of the satellite is a single-carrier signal with a fixed frequency and amplitude transmitted by the satellite. It is a signal that characterizes the existence and related characteristics of the satellite. It is mainly used for antenna alignment and automatic tracking of satellite uplink earth stations. As we all know, the atmospheric environment in which the satellite is located is relatively complex, and the frequency and amplitude of the beacon signal it transmits will be shifted by the influence of the environment. Therefore, there is an urgent need for a beacon demodulation method with high sensitivity, high dynamic range and adaptabil...

AI Technical Summary

Problems solved by technology

[0003] Some conventional beacon demodulation methods are implemented by analog circuit design. Although digital signal processing has also been applied at present, the existing digital signal processing method is relatively simple, the frequency estimation is relatively rough, and there are low sensitivity and allowable frequency deviation. The scope is small and inflexible, and the application scene is relatively single. For example, in the document with the publication number CN208401847U, the filter design is single, the coefficient is fixed, and it is not suitable for more frequency offsets; in the document with the publication number CN108521292A, digital signal processing The module adopts an open-loop structure, and the estimation error of the signal frequency offset is large. The energy of the beacon signal will be damaged after sampling and filtering through the filter, resulting in a large error in the estimation of the beacon power.

Images