Carrier tracking device capable of adaptively adjusting parameters

Abstract

The invention discloses a carrier tracking device capable of adaptively adjusting parameters, comprising an A / D (Analogue / Digital) converter, an orthogonal down convertor, a digital control oscillator, an estimation module, an integrator, a main carrier frequency demodulation and phase demodulation device and a loop filter, wherein an orthogonal down convertor module utilizes a local reference signal to carry out digital down conversion on a sampling signal output by the A / D converter to generate a baseband signal; the digital control oscillator generates the local reference signal according to a carrier frequency offset control word and a carrier tracking frequency control word; the carrier frequency offset control word is generated by the estimation module according to the baseband signal; the carrier tracking frequency control word is generated by the loop filter according to a frequency demodulation and phase demodulation error signal; the main carrier frequency demodulation and phase demodulation device generates the frequency demodulation and phase demodulation error signal according to an integrated signal; and the integrator and the loop filter determine the integrated time and loop filtering parameter according to selected parameters and the selected parameters are determined according to a signal to noise rate of the baseband signal by the estimation module. The carrier tracking device disclosed by the invention can realize the self-adaptive tracking on an upstream carrier signal according to the estimation of the baseband signal of an input signal.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to a carrier tracking device for adaptively adjusting parameters. Background technique [0002] At present, our country has developed newer detectors to detect more distant celestial bodies, including Venus, Mars, and Jupiter. The farthest distance from the moon to the earth is about 400,000 kilometers, while the furthest distance from Mars to the earth is about 400 million kilometers, which is a 1,000-fold increase in distance. In deep space exploration, the signal-to-noise ratio of the received signal has a large dynamic range, C / N0 ranges from 117dBHz with a high signal-to-noise ratio to 20dBHz with a low signal-to-noise ratio, and the Doppler frequency change rate of the received signal varies in a large range , from above 5KHz / s when the signal-to-noise ratio is high, to about 20Hz / s when the signal-to-noise ratio is low, higher requirements are put forward for the carrier...

AI Technical Summary

Problems solved by technology

At present, the tracking sensitivity of the transponder on the lunar satellite CE-1 / 2 that has already flown has only reached above 47dBHz, which cannot meet the needs of further deep space exploration.

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