An aeronautical wireless communication frequency discriminator and its frequency discrimination method

Abstract

The invention discloses an aviation wireless communication frequency detector which comprises a frequency scanning and detecting module, an FFT frequency detecting module and a frequency detection control module. The frequency scanning and detecting module is used for conducting frequency scanning and detecting processing on quasi complex base band signals to obtain a frequency scanning and detecting state and frequency scanning and detecting frequency information. The FFT frequency detecting module is used for conducting FFT frequency detection processing on the quasi complex base band signals to obtain an FFT frequency detection state and FFT frequency detection frequency information. The frequency detection control module is used for analyzing content output by the frequency scanning and detecting module and the FFT frequency detecting module, outputting rough frequency offset information, used for quasi complex base band signal extraction, to a digital down converter, outputting fine frequency offset information, used for residual frequency offset compensation of the quasi complex base band signals, to a secondary frequency converter, and completing system frequency offset identification and compensation. The aviation wireless communication frequency detector can meet the harsh requirements for the frequency detection function in the channel environment with bad wireless communication equipment.

Description

technical field [0001] The present invention relates to the field of wireless communication in aerospace, in particular to a wireless communication discriminator device in aerospace vehicles, which is a kind of discriminator of integrated frequency scanning and FFT frequency discriminator proposed for harsh channel transmission environment Implementation. [0002] technical background [0003] The high-speed relative motion of aerospace vehicles will produce the Doppler effect, and there is an inherent frequency difference in the local oscillator of the transceiver of the wireless communication device, resulting in a gap between the carrier frequency of the signal received by the receiver and the carrier frequency of the transmitter. There is a large deviation, which seriously affects the information capture and demodulation of the receiver. Therefore, the frequency discriminator is an indispensable functional module of wireless communication equipment on various aerospace v...

AI Technical Summary

Problems solved by technology

The traditional phase-locked loop technology to extract the carrier has a contradiction between capture speed and tracking accuracy in a high dynamic environment, and it is difficult to meet the requirements of dynamic and steady-state performance at the same time; and under the constraints of a high dynamic environment and transmission efficiency , the receiver of wireless communication equipment has the problem that it is difficult to use matched filters to obtain spread spectrum processing gain in real time to improve the signal-to-noise ratio of frequency discrimination analysis and processing signals, resulting in the frequency discrimination noise bottleneck in FFT frequency discrimination technology, which does not meet low signal-to-noise requirements Frequency discrimination requirements in harsh channel environments such as ratio and multipath fading

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