Spaceborne synthetic aperture radar reference function acquiring method based on internal scaling data

Abstract

The invention provides a spaceborne synthetic aperture radar reference function acquiring method based on internal scaling data. The method comprises the following steps of 1, acquiring amplitude phase error data of an internal scaler full-array-plane received-and-transmitted scaling pathway, an antenna scaling network and an antenna sub-array; 2, acquiring full-array-plane received-and-transmitted scaling data of a radar system on the condition of a preset working bandwidth and pulse width parameter; and 3, compensating amplitude phase error of the internal scaler, the scaling network and the antenna sub-array in the full-array-plane received-and-transmitted scaling data and the like. According to the method of the invention, on the condition of relatively high characteristic consistency between a radar received-and-transmitted copying signal and an actual received-and-transmitted signal, a reference function is used for performing coupling processing, thereby obtaining an effect which is approximate to a standard sinc function, and realizing most powerful supplementing and improvement to predistortion processing of the radar system. The spaceborne synthetic aperture radar reference function acquiring method is suitable for subsequent all radar microwave loads with a full-array-plane received-and-transmitted scaling mode and settles a problem of relatively high influence of radar system amplitude phase error to an imaging performances. Furthermore the method has a remarkable effect for improving imaging performance of the radar system.

Description

technical field [0001] The invention relates to a radar satellite microwave payload test data processing method, in particular to a spaceborne synthetic aperture radar reference function acquisition method based on internal calibration data. Background technique [0002] Synthetic aperture radar is not affected by factors such as sunshine and weather conditions, and can observe and image the earth all day and all weather. Its geometric resolution has nothing to do with radar height and wavelength. It has unique application advantages in fields such as surveying, mapping and military affairs, and plays an irreplaceable role with other remote sensors. [0003] The pulse pressure performance of the synthetic aperture radar system directly determines the quality of the final radar image, and the pulse pressure performance of the radar system is determined by the matching processing function (hereinafter referred to as "reference function") selected by it. Due to the nonlinear er...

AI Technical Summary

Problems solved by technology

However, to ensure that the radar system transmits peak power without being affected, the radar system pre-distortion processing generally only compensates the system phase error, but does not do any processing on the amplitude error, so the radar system after pre-distortion processing still has fixed amplitude error

At this time, using the theoretical linear frequency modulation signal as a reference function, although the pulse pressure results will be improved, but in the case of large amplitude and phase errors, the pulse pressure performance may not meet the use requirements.

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