Calibration system and method for amplitude-phase error of receiving channel of spaceborne DBF network

Abstract

The invention discloses a calibration system and method for the amplitude-phase error of a receiving channel of a spaceborne DBF (Digital Beam Forming) network. The system comprises a calibration signal generating module, a calibration signal transmitting module, a receiving channel and calibration interface module, and a calibration algorithm execution module, wherein the calibration algorithm execution module comprises an amplitude-phase error estimator and a calibration factor generator; the calibration signal generating module comprises an orthogonal pseudo random code block generator and a BPSK (Binary Phase Shift Keying) modulator; the calibration signal transmitting module comprises a digital up converter, a DA inverter, an analog up converter and a calibration feed source; the calibration signal generating module is connected with the calibration signal transmitting module; and the calibration algorithm execution module is connected with the receiving channel and calibration interface module. The system and the method provided by the invention have the advantages of strong real-time performance, high precision and high stability, and save satellite resources.

Description

technical field [0001] A space-borne DBF (Digital Beam Forming Network) receiving channel amplitude and phase error calibration system and method of the present invention particularly relates to the field of receiving channel calibration based on mobile communication satellite payloads. Background technique [0002] The mobile communication satellite system uses beamforming technology to form multiple spot beams for wide-area coverage to enhance radiation gain and support small terminal mobile communication services. For example, Thuraya satellite forms 245 spot beams, and Imarsat4 satellite forms 228 spot beams. When the satellite antenna works for a long time, its active components, such as low-noise amplifiers, solid-state power amplifiers, phase shifters, etc., will gradually age with the increase of working time, and cause changes in signal amplitude and phase in different channels, which will affect the The system performance of the multi-beam antenna is affected, so t...

AI Technical Summary

Problems solved by technology

Since the ground signal received by the multi-beam antenna reaches each channel with a large difference in amplitude, up to 30dB or more, the ground signal cannot be used as the calibration signal source

Consider setting up the calibration signal source on the star. The calibration signal source on the star is usually calibrated by the wired calibration method, and the calibration is performed by coupling and injecting the calibration signal for each channel. The wired method requires a large number of hardware devices. On-board equipment brings a lot of burden, occupying valuable weight and power resources of the system

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