A method for real-time communication of large dynamic Doppler scene of hypersonic aircraft

Abstract

A method for real-time communication of large dynamic Doppler scene of hypersonic aircraft includes steps of: at the sending end, pre-coding a transmitting signal, inserting pilot data and sending; atthat receive end, extracting pilot data; on the one hand, coarsely capturing doppler frequency offset and doppler primary change rate by using pilot information; on the other hand, estimating channelstate information by using pilot information; in the aspect of acquisition, by using the method of fft-based parallel segmentation, accomplishing fast and coarse acquisition; after coarse acquisitionof doppler frequency offset and doppler rate of change, manually shifting the received data, and estimating channel state information and merging diversity. The invention can meet the requirements ofreal-time telemetry communication of a hypersonic aircraft, has the characteristics of short time consumption and low complexity, and has important significance for the real-time communication of thehypersonic aircraft.

Description

Technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a real-time communication method of a hypersonic aircraft with a large dynamic Doppler scene. Background technique [0002] At present, the existing technology commonly used in the industry is as follows: a hypersonic vehicle usually flies at a high speed above Mach 10 in an adjacent space of 20-100km. There is a large relative motion and radial velocity between the aircraft and the ground measurement and control station, which will cause a large Doppler frequency shift in the carrier frequency. In a typical measurement and control S-band, the maximum Doppler shift may exceed 150kHz, and when the aircraft has a high acceleration, there is a rate of change of the Doppler frequency shift, and the maximum rate of change can also reach 10kHz / s. This makes the Doppler frequency deviation drift in a large frequency range, which brings great difficulties to the ra...

AI Technical Summary

Problems solved by technology

The ML method is a multi-dimensional nonlinear optimization problem with high computational complexity and high requirements for the selection of the initial value, which is almost impossible to apply in practice; the time-frequency analysis method is suitable for the detection of non-stationary signals, which is not conducive to weak and high dynamics Real-time capture of signals; frequency-locked phase-locked loop methods have the disadvantages of high hardware complexity, poor dynamic performance, easy loss of lock and long time consumption in the tracking loop

In the above-mentioned traditional method in the large dynamic Doppler scene, due to the large Doppler frequency deviation, it takes a long time to accurately capture; due to the high dynamics of Doppler, it is difficult to capture in real time, so that the capture time / capture speed and accuracy are limited. Irreconcilable contradictions, unable to meet the needs of fast real-time communication of hypersonic vehicles

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