Satellite-borne synthetic aperture radar antenna direction diagram obtaining method based on internal calibration data

Abstract

The invention discloses a satellite-borne synthetic aperture radar antenna direction diagram obtaining method based on internal calibration data. The satellite-borne synthetic aperture radar antenna direction diagram obtaining method comprises steps of respectively obtaining amplitude phase error data and a typical position antenna sub-array direction diagram of each calibration channel of a satellite-borne synthetic aperture radar antenna calibration network when a ground standalone product is tested, choosing radar working parameters like a suitable bandwidth, a pulse width, etc, obtaining and recording emission / reception pulse calibration signals which are transmitted by each T / R channel on an antenna array plane one by one under a single T / R testing calibrated working mode . The satellite-borne synthetic aperture radar antenna direction diagram obtaining method based on internal calibration data realizes a verification test on a phased array antenna direction diagram performance (near intermediate frequency or in-band average), solves a problem that a traditional radar satellite phased array antenna has no effective assessment means performed on direction diagram performance in each stage of a whole satellite testing, greatly improves testing efficiency of a radar load during a whole satellite stage, and shortens a study cycle of the whole satellite.

Description

technical field [0001] The invention relates to a method for testing radar satellite whole-satellite radar load, in particular to a method for acquiring a spaceborne synthetic aperture radar antenna pattern based on internal calibration data. Background technique [0002] Synthetic aperture radar is an active remote sensor that works in the microwave band. It is not affected by factors such as sunshine and weather conditions, and can observe and image the earth all day long, so it has unique application advantages in disaster monitoring, environmental and ocean monitoring, resource exploration, crop yield estimation, surveying and mapping, and military affairs. The irreplaceable role of other remote sensors. [0003] Planar active phased array antennas have been widely used in spaceborne synthetic aperture radar systems due to their characteristics of high transmit peak power, large antenna gain, shapeable antenna beam, fast switching and wide-angle scanning. However, ther...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a spaceborne synthetic aperture radar antenna pattern acquisition method based on internal calibration data, which can solve the problem that the traditional synthetic aperture radar satellite phased array antenna has no effective pattern performance in each stage of the whole satellite test. The problem with means of verification

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