Dual-pilot frequency carrier resetting device for aviation wireless communication

Abstract

The invention discloses a dual-pilot frequency carrier resetting device for aviation wireless communication. The carrier resetting device comprises a multistage convolution cascading filtering module, a rough carrier resetting module and a fine carrier resetting module. The multistage convolution cascading filtering module performs multistage convolution cascading filtering, and obtains upper sideband pilot frequency information, lower sideband pilot frequency information and modulation data information containing pilot frequency information according to rough carrier resetting information provided by the rough carrier resetting module. The rough carrier resetting module performs frequency discrimination and analysis for the upper sideband pilot frequency information and the lower sideband pilot frequency information provided by the multistage convolution cascading filtering module, controls completion of rough carrier shift compensation of standard complex baseband signals and outputs the rough carrier shift compensation to the multistage convolution cascading filtering module. The fine carrier resetting module performs phase discrimination and analysis on the upper sideband pilot frequency information and the lower sideband pilot frequency information provided by the multistage convolution cascading filtering module, and completes fine carrier shift compensation for modulation data information provided by the multistage convolution cascading filtering module according to the results of the frequency discrimination and the analysis.

Description

technical field [0001] The present invention relates to the field of aeronautical wireless communication, in particular to the carrier recovery design of the aeronautical wireless digital broadband transmission system, which is proposed for the aeronautical wireless channel environment, based on the rough and fine two-level structure and using double pilots to realize the carrier recovery method. technical background [0002] The oscillator of the transceiver in the wireless communication system has inherent frequency and phase deviation, which will cause the frequency and phase deviation of the carrier of the receiving and receiving signal. In addition, the Doppler effect caused by the relative movement of the transceiver will increase the carrier frequency deviation. For most wireless communication systems, the signal received by the receiver must be processed by carrier recovery, so that the frequency phase of the carrier is consistent with the carrier frequency of the si...

AI Technical Summary

Problems solved by technology

[0003] In aeronautical wireless communication, the high-speed and high-maneuvering motion of the aircraft will bring about a strong and rapidly time-varying Doppler effect. The traditional technology that only uses frequency-locked phase-locked loops to recover the carrier has a limited capture speed in high-dynamic environments. It is difficult to meet the requirements of dynamic capability and steady-state performance at the same time due to the contradiction between tracking accuracy

[0004] In addition, in principle, carrier recovery can be achieved by using a single pilot signal. However, during the take-off and landing of aircraft and near-earth flight, there may be strong multipath signals, and deep valleys will appear in the signal spectrum.

When the multipath signal is in a certain delay or phase, the single pilot may be greatly attenuated, so that carrier recovery cannot be achieved

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