A real-time communication method for large dynamic Doppler scenes of hypersonic vehicles

Abstract

The invention belongs to the technical field of wireless communication, and discloses a method for real-time communication of hypersonic aircraft large dynamic Doppler scene, including: at the sending end, precoding the sending signal, inserting pilot data before sending; at the receiving end, extracting Pilot data, on the one hand, use the pilot information to roughly capture the Doppler frequency offset and Doppler primary rate of change, and on the other hand, use the pilot information to estimate the channel state information; in terms of capture, the method based on FFT parallel segmentation is used to complete fast and rough capture ; After the Doppler frequency offset and the Doppler change rate are roughly captured, the received data is manually moved, and the channel state information is estimated to perform diversity combining. The invention can meet the requirements of real-time telemetry communication of the hypersonic aircraft, has the characteristics of short time consumption and low complexity, and is of great significance to the real-time communication of the hypersonic 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 large dynamic Doppler scene of a hypersonic aircraft. Background technique [0002] At present, the existing technology commonly used in the industry is as follows: hypersonic aircraft usually fly at a speed of Mach 10 or more in the 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 change rate of the Doppler frequency shift, and the maximum change rate can reach 10kHz / s. This makes the Doppler frequency offset drift in a large frequency range, which brings great difficulties to the receiver to qui...

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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