Satellite-borne SAR beam scanning method based on parabolic antenna

Abstract

The invention belongs to the technical field of radar transmitting signal processing, and particularly relates to a satellite-borne SAR beam scanning method based on a parabolic antenna. The method comprises a step 1 of setting a period Tr of performing a V-scan once; a step 2 of setting the number N of scanned sub-observation bands; a step 3 of calculating the azimuth resolution [rho]v-scan of the sub-observation bands; and a step 4 of calculating the ground range width Wgr and the azimuth width Wga of a combined observation band. Compared with a traditional SAR scanning mode, the beam scanning method of the invention can realize an effect with the parabolic antenna other than a phased array antenna in terms of economical benefit, thereby greatly saving the manufacturing cost of the satellite-borne SAR antenna and having high cost performance. In terms of performance, the continuous V-scan improves the azimuth observation band width, and improves the azimuth sub-observation band connection, and contributes to large-scene high-width one-time imaging.

Description

technical field [0001] The invention belongs to the technical field of radar transmission signal processing, and in particular relates to a spaceborne SAR beam scanning method based on a parabolic antenna. Background technique [0002] With the rapid development of space information technology, controlling and utilizing space has become one of the important goals pursued by the world's military powers. Spaceborne synthetic aperture radar (SAR) has become an important means of space observation of the earth because it is not affected by weather and climate, and can observe the earth at all times, all weather, high resolution, and large areas. As an effective means to quickly obtain surface changes, spaceborne SAR has been widely used in many fields such as land surveying and mapping, resource investigation, military investigation, and environmental monitoring with the continuous development in recent years. [0003] Since the first SAR satellite was successfully launched in ...

AI Technical Summary

Problems solved by technology

Although the traditional scanning mode can increase the observation bandwidth in the range direction, the observation bandwidth in the azimuth direction is still limited by the inherent beam width of the antenna, which has not been improved, and the sub-bands of the two scanning periods forward and backward in the azimuth are not well connected

Furthermore, the traditional SAR scanning mode usually uses a phased array antenna system based on T / R components for electronic scanning, and each T / R component is expensive, so the manufacturing cost of the entire spaceborne SAR antenna will be greatly increased. This also restricts the development and application speed of spaceborne SAR to a certain extent.

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