Deep space measurement and control system and method based on frequency domain equalization

Abstract

The invention discloses a deep space measurement and control system and method based on frequency domain equalization, and relates to the technical field of deep space measurement and control. The method includes the following steps: the ground station separately spreads the measurement and control information and the timing code, performs constellation mapping, and performs Fourier transformation. , to generate two frequency domain signals, and then perform oversampling, inverse Fourier transform, and add cyclic prefix to the frequency domain signals respectively to form time domain signals and transmit them; the aircraft obtains measurement and control information, timing codes and two m-sequences; the aircraft Process data information and timing codes to form downlink signals and transmit them; the ground station sequentially performs time-frequency synchronization, channel estimation, cyclic prefix removal, Fourier transform, frequency domain equalization, and inverse Fourier transform on the downlink signals to obtain equalization The time-domain signal is then demapped and despread to obtain new data information and new timing codes; the ground station performs phase comparison and calculates the distance. The invention has better anti-multipath interference ability, can effectively improve frequency band utilization, and solves the problem of measurement and control in deep space, long distance and low elevation angle.

Description

technical field [0001] The invention relates to the technical field of deep space measurement and control, in particular to a deep space measurement and control system and method based on frequency domain equalization. Background technique [0002] In order to meet the ranging performance required by deep space missions, various ranging methods have emerged one after another. Among them, the ranging system in the deep space measurement and control communication system includes a ground station and an aircraft, which are used to determine the distance between the ground station and the aircraft. At present, the deep space ranging system often adopts the pseudo-code ranging technology, because the pseudo-code ranging technology has obvious advantages: strong anti-interference ability, and can share spectrum with other signals. After carrier phase mapping, the code is sent directly through the antenna, and the transmitted signal is easily affected by multipath interference, res...

AI Technical Summary

Problems solved by technology

At present, the deep space ranging system often adopts the pseudo-code ranging technology, because the pseudo-code ranging technology has obvious advantages: strong anti-interference ability, and can share spectrum with other signals. After carrier phase mapping, the code is directly sent out through the antenna, and the transmitted signal is easily affected by multipath interference, resulting in a decrease in ranging accuracy; moreover, the receiver generally uses time-domain equalization technology, which has high computational complexity. tougher

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