Deep space measurement and control system and method on basis of frequency-domain equalization

Abstract

The invention discloses a deep space measurement and control system and a deep space measurement and control method on the basis of frequency-domain equalization and relates to the technical field of deep space measurement and control. The method comprises the steps that a ground station respectively carries out frequency spreading, constellation mapping and Fourier transform on measurement and control information and a time service code to generate two paths of frequency-domain signals, then forms time-domain signals after respectively carrying out oversampling, inverse Fourier transform and addition of a cyclic prefix on the frequency-domain signals, and transmits the time-domain signals; an aircraft obtains the measurement and control information, the time service code and two paths of m sequences; the aircraft processes the data information and the time service code to form a downlink signal and transmits the downlink signal; the ground station sequentially carries out time and frequency synchronization, channel estimation, removal of the cyclic prefix, Fourier transform, frequency-domain equalization and inverse Fourier transform on the downlink signal to obtain an equalizing time-domain signal and then carries out demapping and dispreading to obtain new data information and a new time service code; the ground station carries out phase comparison and calculates a distance. The deep space measurement and control system and the deep space measurement and control method have high resistance to multipath interference, can effectively improve a band utilization rate and solve the measurement and control difficult problem under the deep space remote low-elevation-angle condition.

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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