A Robust Mute Method for Civil Aviation VHF Receiver

Abstract

The invention discloses a robust mute method for a civil aviation VHF receiver. The specific steps include: performing frequency spectrum shifting and extracting and filtering processing on a received signal; performing frequency domain conversion on the extracted and filtered signal to obtain the spectral energy of the signal distribution; calculate the field strength of the signal according to the spectral energy distribution of the signal; perform mean filtering on the spectral energy distribution of the signal; sort the spectral energy after mean filtering; calculate the useful signal energy and time-varying noise according to the sorted spectral energy Energy, the ratio of useful signal energy to time-varying noise energy is taken as the signal-to-noise ratio; when the field strength and signal-to-noise ratio of the signal meet the mute conditions, the signal is muted. The invention calculates the noise energy as a time-varying signal, thereby obtaining more accurate signal-to-noise ratio parameters and enhancing the anti-noise ability, and can accurately realize the mute function of the civil aviation VHF receiver.

Description

technical field [0001] The invention relates to the field of communication, in particular to a robust mute method for a civil aviation VHF receiver. Background technique [0002] Civil aviation ground-air VHF voice communication relies on radio waves in the VHF frequency band to provide direct voice communication services between air traffic control departments, airline operation management departments and pilots, and provides special channels for emergency situations such as search and rescue of civil aviation aircraft Assure. At present, the modulation method of VHF ground-to-air voice communication is double-sided band amplitude modulation. In order to better ensure communication effects and solve problems such as cross coverage, civil aviation receivers should turn off the sound of the receiver when the signal is weak and the noise is high, so as to mute the received signal. [0003] At present, the traditional mute methods mainly include carrier mute and voice mute. T...

AI Technical Summary

Problems solved by technology

However, in essence, this method expresses the noise energy as a constant by default, and does not consider the influence of spectral environment transformation on the calculation results of parameters such as signal-to-noise ratio.

The environment in which civil aviation VHF receivers are used is varied. When the equipment is installed in a complex wireless spectrum, the background noise energy is a time-varying signal. This method will have a large error when calculating the signal-to-noise ratio of the received signal, resulting in static If the noise switch is missed or falsely opened, effective mute control cannot be achieved

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