High Dynamic Weak 8psk/16psk Signal Carrier Capture Method

Abstract

The invention discloses a high-dynamic weak 8PSK / 16PSK signal carrier acquisition method, which has the advantages of high precision of the acquisition result and good real-time performance. The present invention is realized by the following technical solutions: the filtering and sampling module first performs filtering and sampling processing on the received signal, and writes the data into the data ping-pong buffer space in positive order; the data processing unit reads the ping-pong buffer data in reverse order from the data buffer space of the ping-pong buffer module; The rate compensation module performs carrier Doppler frequency change rate compensation on the sampled data, and sends the accumulated results to the FFT module for time-frequency transformation operations; the incoherent integration module approximates the absolute value of the complex data after time-frequency transformation, and then performs non-coherent integration. Coherent integration; the spectral windowing module performs cosine windowing and smoothing on the data after incoherent integration; the threshold median module combines the integration results to determine whether the capture is successful or not; the solution correction module corrects according to the median result and the Doppler rate of change Obtain the carrier Doppler at the current moment to complete the carrier acquisition.

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 dynamic 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, satellites, spacecraft and other targets are very far away from the ground measurement and control equipment, which makes the ground signal The signal received...

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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