Estimation method of far-field interference signal strength for co-orbit multi-satellite distributed array antenna

Abstract

The invention discloses a method for estimating the far-field interference signal strength of a multi-satellite distributed array antenna on the same track. The steps include: each satellite of the distributed constellation is equipped with a space-borne phased array antenna unit with the same frequency and the same polarization; Integrating the influence of non-coherent synchronization conditions such as atmospheric turbulence, antenna pointing error, and random fluctuations in transmit power and gain, calculate the far-field signal strength of the signal transmitted by each spaceborne phased array antenna unit at the ground user; calculate the The interference situation of the signal transmitted by the phased array antenna unit at the ground user; the comprehensive influence of the non-coherent condition on the far-field interference signal strength of the distributed array antenna is analyzed. The method of the present invention comprehensively considers the influence of non-coherent synchronization conditions on the far-field signals of each spaceborne phased array antenna unit, and the proposed interference model is more in line with the actual signal interference results, and supports the analysis of the far-field interference of multiple spaceborne phased array antenna units , which is suitable for spatially distributed constellations of different scales, and the calculation process is relatively simple.

Description

technical field [0001] The invention belongs to the technical field of satellite communication, and in particular relates to a method for estimating the strength of far-field interference signals of co-orbit multi-satellite distributed array antennas. Background technique [0002] In the future, the demand for satellite communication will continue to develop towards larger capacity and higher speed, which puts forward higher requirements for the antenna gain capability of high-throughput satellites. According to the antenna theory, in order to increase the antenna gain, increasing the antenna aperture is an effective way, and increasing the antenna aperture mainly includes the use of large reflector antennas, centralized array antennas and distributed array antennas. Due to the limitations of satellite carrying capacity, platform capability, and surface accuracy, there are upper bounds on the improvement of antenna gain by large-aperture reflectors and centralized array ante...

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Problems solved by technology

Chinese patent CN104537202 proposes a satellite formation-based cooperative space antenna array synthesis method, establishes a GEO satellite formation signal cooperative reception model, and analyzes the influence of time difference and frequency difference, but the above research only considers the cooperative communication of 2 satellites, And the effects of atmospheric turbulence, random fluctuations and pointing errors are not analyzed

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