Star-carrying multichannel antenna SAR data channel amplitude and phase error correction platform

Abstract

The invention provides a satellite-borne multichannel aerial SAR data channel magnitude-phase error correction platform, wherein, ratio results of magnitude-phase characteristics of other channels anda magnitude-phase characteristic of a selected standard channel can be obtained after selection of the magnitude-phase characteristic of the channel as criterion and complex division operation of themagnitude-phase characteristics of the other channels and the magnitude-phase characteristic. When actual data is processed, that the magnitude-phase characteristics of the other channels except thestandard channel is divided by the corresponding ratio results is only needed, thereby errors which are led in by a signal generator are avoided; in addition, though the magnitude-phase characteristicof the selected standard channel is not completely ideal, occurrence of false targets in the azimuth direction can be effectively prevented and an ideal azimuth direction image performance index canbe obtained due to the fact that data of each channel is provided with the same magnitude-phase characteristics after magnitude-phase error correction. Simultaneously, error compensation effects are evaluated and adjusted by self adaptive means from the imaging angle, thereby satisfactory compensation effects are obtained.

Description

technical field [0001] The invention belongs to the field of signal processing, and relates to a signal processing platform, in particular to a space-borne multi-channel antenna SAR data channel amplitude and phase error correction platform. Background technique [0002] Synthetic Aperture Radar (SAR) satellites have developed rapidly in recent years. Since SAR satellites are not limited by factors such as weather, geography, and time, they can observe the earth all day long and have certain penetrating power, so they are widely used. It is used in military reconnaissance, resource detection, ocean observation, ecological monitoring, etc. [0003] At present, spaceborne SAR is developing in the direction of multi-polarization, multi-band, high-resolution and wide swath. Among them, the high-resolution wide surveying swath is one of the important development directions of the current spaceborne SAR technology. For the conventional spaceborne SAR strip mode, there is a contr...

AI Technical Summary

Problems solved by technology

However, in reality, due to the limitations of the technological level, the amplitude and phase characteristics of each receiving channel are different, and they change with factors such as ambient temperature and signal power, resulting in the phase delay and amplitude of different channels for signals The difference in weighting characteristics causes the inconsistency error of the amplitude and phase characteristics of the data channel (abbreviated as the amplitude and phase error), which in turn leads to the azimuth upward of the radar image generated after imaging processing, and the appearance of paired echo false targets, resulting in a decrease in the peak energy of the main lobe , the spatial resolution becomes worse, and the integral sidelobe ratio and peak sidelobe ratio indicators deteriorate

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