Satellite-borne interference imaging altimeter antenna

Abstract

The invention discloses a spaceborne interference imaging altimeter antenna, which is a shaped beam planar array antenna given based on a physical size. The antenna comprises a plurality of sub-arrays, wherein each sub-array comprises a plurality of array elements, array element excitation in each sub-array is equal in amplitude and same in phase, the distance direction of the antenna adopts a shaped beam design, a shaped beam and excitation are determined according to a shaped curve, a sidelobe level, an antenna array element and an amplitude-phase constraint index within an incident angle range; the sub-array division technology is adopted in azimuth design of the antenna, a pen-shaped beam with expected Taylor weighted directional diagram characteristics is achieved through sub-array level amplitude weighting, and excitation parameters of the antenna are determined according to design results of the distance direction and the azimuth direction according to the separable planar array forming principle. According to the antenna, the antenna distance direction is subjected to shaped beam synthesis, interference height measurement precision can be improved, the azimuth direction is subjected to subarray division, the antenna bandwidth can be improved, the whole antenna system structure is simplified, and the hardware implementation cost and engineering difficulty are reduced.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a satellite-borne interference imaging altimeter antenna. Background technique [0002] The spaceborne interferometric imaging altimeter is a microwave remote sensor that uses small-angle incidence and short-baseline interference to achieve high-precision observations of land and sea surfaces. It is one of the main remote sensors for marine dynamic environment observations (literature [1]: Y. J. Jiang, X. Zhang, K. Xu, J. Yan, C. Jiang, et al, "Design and preliminary experiment of china imaging altimeter," Microwave Remote Sensing of the Atmosphere and Environment III, pp.190-199, 2003) . In 2016, the world's first space-borne interferometric imaging altimeter was launched with the Tiangong-2 space laboratory, breaking through the limitations of traditional altimeters that can only perform one-dimensional line observation of sub-satellite points along the flight direction, ...

AI Technical Summary

Problems solved by technology

[0005] The current space-borne interferometric imaging altimeter antenna distance observation is inconsistent, the feed network is complicated, the processing is difficult, and the working bandwidth is narrow, which is not conducive to the high-precision observation of mesoscale ocean phenomena.

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