Frequency-domain solution to time-delay ambiguity of deep-space antenna array

Abstract

The invention proposes a frequency domain solution time delay fuzzy method for a deep space antenna and aims at providing the method which does not depend on prior information (accurate site location and the transit trajectory of a spacecraft). The method is achieved through the following technical scheme which comprises the steps: calculating and obtaining a non-fuzzy frequency range of a frequency domain phase spectrum in an initial time delay range between given channels according to the geometric orientation between the spacecraft and a ground station; carrying out the correction of time delay between channels in the range according to the precise estimation results, obtained through curve fitting, of time delay; updating the non-fuzzy frequency range of the frequency domain phase spectrum according to the correction precision of time delay, obtaining the further precise estimation of time delay in the range through curve fitting, and carrying out the correction of time delay between channels according to the estimation results; carry out quitting if the correction precision of time delay meets the requirements, or else repeating the last step till the correction precision of time delay meets the requirements. The method gets rid of the excessive dependence on accurate site location and the transit trajectory of the spacecraft.

Description

technical field [0001] The invention relates to a method for solving time-delay ambiguity in the frequency domain of a deep-space antenna array. Background technique [0002] The challenges faced by deep space measurement and control communication are: longer distance, higher data rate, and more robust emergency measurement and control communication. Typical technical approaches to improve system transmission capabilities include: building larger-diameter antennas, developing receivers with lower noise, using newer encoding and decoding schemes, and so on. The cost of these technical approaches is extremely high, and the performance of the overall system can only be gradually improved a little bit. Using a large number of small antenna arrays to achieve the performance of large antennas with the same equivalent aperture and reducing maintenance costs is the key development direction of subsequent deep space measurement and control communications. The main problem in the de...

AI Technical Summary

Problems solved by technology

The main problem in the deep space downlink antenna array is that the signal arrives at each unit antenna in the antenna array and the transmission path between each unit antenna and the signal combiner is different, resulting in a time-varying delay difference when the signal reaches the combiner

The correction of the time delay difference in the existing antenna array synthesizer is based on the pre-correction table generated by prior information such as the station site and the trajectory of the spacecraft. Usually, the accuracy of the pre-correction table is too low, which will cause the delay to be blurred and affect the time delay. Delayed Accurate Correction

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