Common-aperture simultaneous transmitting multi-beam method for phased array radar

Abstract

The invention discloses a common-aperture simultaneous transmitting multi-beam method for phased array radar, belongs to the technical field of the phased array radar, and particularly relates to a common-aperture simultaneous transmitting multi-beam forming method for digital array phased array radar. A transmitting terminal of an array antenna transmits two orthogonal code wave signals which are linearly superposed after phase weighting, the signals are amplified through a linear power amplifier and then transmitted out through antenna array elements, and beams with different directions can be obtained. A receiving antenna receives signals reflected by a far field object, matching processing is conducted on the signals through a matching filter, and two transmitting signals can be separated out. Thus, the method has the advantages that during radar detection, a dead zone is small, beam broadening caused by subarray segmentation is avoided, and the method is particularly suitable for multi-object detecting and tracking of short ranges and medium ranges of the phased array radar.

Description

technical field [0001] The invention belongs to the technical field of phased array radar, and in particular relates to a method for forming multiple beams of a digital array phased array radar with a common aperture and simultaneous emission. Background technique [0002] Phased array radar, also known as phased array radar, is an electronically scanned array radar that changes the beam pointing by changing the phase of the transmitted signal. Compared with radars whose antennas scan mechanically, the biggest difference is that the antenna beam can be scanned quickly without turning the antenna. Digital Array Radar (Digital Array Radar) is a fully digital phased array radar in which both receiving and transmitting beams are digitally realized. It can perform amplitude-phase weighting in the digital domain to realize digital beamforming for sending and receiving, and its core technology is an all-digital T / R component. [0003] Another advantage of digital array radar is t...

AI Technical Summary

Problems solved by technology

For the former, the simulation method implemented by hardware, once the multi-beam network scheme is determined, the beam shape and beam pointing etc. are fixed and difficult to change, especially it cannot adaptively form multiple beams, and the anti-interference ability is very poor

For the latter, the radar antenna array is divided into L sub-arrays, and each sub-array forms a beam independently. In this way, the energy of the radar transmitter is not fully utilized, and the aperture and peak transmission power of the antenna are reduced to 1 before the division. / L, which greatly reduces the angle measurement accuracy of the radar

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