Ultra-large reflective array wide-angle scanning antenna based on frequency stepping

Abstract

The invention provides an ultra-large reflective array wide-angle scanning antenna based on frequency stepping, a large-angle antenna scanning result can be obtained, the detection range of the antenna is expanded, and more information is provided for subsequent target detection, identification and analysis. According to the invention, based on the frequency stepping signal, the instantaneous bandwidth of an ultra-large reflective array plane system is reduced, and the high distance resolution is realized at the same time. The implementation thought of the frequency stepping signal is that a series of narrow-band signals are transmitted, the carrier frequency of each narrow-band pulse is stepped, the stepping amount is delta f, and the initial carrier frequency is f0, i.e., the carrier frequency of the n narrow-band pulse is fn = f0 + n delta f. And the signal receiver samples and receives each narrow-band pulse, so that the difficulty of subsequent processing is greatly reduced. Abroadband signal with the total bandwidth of N delta f is obtained by transmitting N pulses, the distance resolution is improved to a high-distance-resolution scanning result under the broadband signal through comprehensive processing of N narrow-band echoes, and the high-distance-resolution scanning result under the broadband signal is obtained through a method of combining pitching direction scanning and azimuth direction scanning.

Description

technical field [0001] The invention belongs to the technical field of radar astronomy, and in particular relates to a super-large reflective array wide-angle scanning antenna based on frequency stepping. Background technique [0002] Radar astronomy is a subject that uses radar to send electromagnetic waves into deep space, analyze the reflected echoes of celestial bodies, and explore the properties and structures of celestial bodies. [0003] With the deepening of deep space exploration, the requirements for antenna gain and resolution are gradually increasing. Enlarging the aperture of the antenna can effectively increase the effective receiving area of ​​the antenna, thereby increasing the gain of the antenna. The reflector antenna can use the rotation of the reflector to increase the aperture of the antenna to a certain extent, so it has been widely researched and applied. [0004] In order to reduce the distance resolution of the ultra-large-aperture reflector antenn...

AI Technical Summary

Problems solved by technology

However, since the transmission of broadband signals requires a high instantaneous bandwidth of the system, it increases the system's hardware requirements and is not easy to implement.

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