Calibration method and calibration system for amplitude phase error of satellite-borne DBF (Digit Beam Forming) transmitting channel

Abstract

The invention provides a calibration method and calibration system for the amplitude phase error of a satellite-borne DBF (Digit Beam Forming) transmitting channel. The calibration method and the calibration system respectively comprise two levels of calibration schemes, and the two levels of calibration schemes are composed of output Butler front-end channel part amplitude phase calibration and output Butler rear-end channel part amplitude phase calibration. The method comprises the following steps of: firstly, injecting a calibration signal after inputting the Butler, and coupling the calibration signal at a test port which transmits the Butler, thereby realizing the calibration of a frequency mixer and a power amplifier; and then, keeping the original calibration signal injection mode, and receiving the calibration signal through a far field, thereby realizing the calibration of a filter and a feed source array. Through the method and system provided by the invention, the measurement accuracy of the amplitude phase error is improved greatly, so that the method and the system can be used for effective loads of communication satellites, detection satellites and navigation satellites, and also can be used in the technical fields of ground radars and the like.

Description

technical field [0001] The invention relates to a spaceborne DBF (digital beam forming) transmission channel amplitude and phase error calibration method and calibration system, which are mainly used in the field of satellite load transmission channel calibration. 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. Due to the uneven distribution of population in the region, the distribution of communication traffic is also uneven, and the peak time of communication is also different every day. With the development of the economy in various places, this demand is constantly changing; in order to make full use of satellite resources, The downlink of the mobile communication satellite system adopts the...

AI Technical Summary

Problems solved by technology

Due to the coupling between channels caused by the Butler matrix, it is more difficult to measure and calibrate the amplitude and phase errors

The existing technology mostly uses the far-field calibration method, which has been widely used in the remote calibration of satellite communication systems, but it is aimed at the amplitude-phase consistency calibration under the condition that the transmission channels are independent of each other, while for the mutual coupling of the transmission channels The performance of the amplitude-phase consistency calibration drops sharply, and even does not apply

[0003] Therefore, at present, there is no calibration technology for the amplitude and phase error of the spaceborne DBF transmission channel with Butler matrix at home and abroad.

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