High-dynamic weak 8PSK/16PSK signal carrier capturing method

Abstract

The high-dynamic weak 8PSK / 16PSK signal carrier capturing method disclosed by the invention is high in capturing result precision and good in real-time performance. The method is realized through the following technical scheme: a filtering sampling module firstly performs filtering sampling processing on a received signal, and writes data into a data ping-pong cache space in a positive sequence; the data processing unit reads ping-pong cache data from a data cache space of the ping-pong cache module in an inverted sequence; the change rate compensation module carries out carrier Doppler frequency change rate compensation on the sampled data, and sends an accumulation result to the FFT module for time-frequency transformation operation; the incoherent integration module is used for approximately obtaining absolute values of the complex data after time-frequency transformation and then carrying out incoherent integration; the spectrum windowing module performs cosine window windowing smoothing on the data after incoherent integration; the threshold median module judges whether capture succeeds or not by combining an integral result; and the resolving and correcting module corrects according to the median result and the Doppler change rate to obtain the carrier Doppler at the current moment, and completes carrier capture.

Description

technical field [0001] The invention belongs to the field of wireless communication, and relates to a carrier acquisition method of 8PSK and 16PSK signals under the condition of high dynamics and low signal-to-noise ratio in an aerospace measurement and control system. Background technique [0002] In the aerospace measurement and control system, the target and the ground signal receiving station have high-speed radial motion, which causes the signal carrier to generate a Doppler frequency offset of hundreds of kHz, and the carrier Doppler frequency range is large; when the target accelerates and decelerates, During the process of entering the orbit or landing, the acceleration will cause the signal carrier to have a large Doppler frequency change rate, and the signal has high dynamic characteristics; at the same time, the targets such as satellites and spacecraft are very far away from the ground measurement and control equipment, which makes the ground signal The signal re...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the disadvantage that the traditional capture method cannot accurately obtain the carrier frequency of high dynamic weak signals, the present invention provides a capture result with high precision and good real-time performance for 8PSK and 16PSK signals, which can adapt to larger carrier Doppler and its changes 8PSK and 16PSK signal carrier acquisition methods in the rate range

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