An Optimal Design Method for Cosecant Squared and Synthesized Phase Dual Constrained Lobe Array Antennas

Abstract

The invention discloses an optimum design method for a double-constraint lobe array antenna based on cosecant square and combined phases, mainly solving the problems that the angles of cosecant squarelobes of existing antennas cannot be measured and the angular accuracy of pen-shaped lobes is low due to low elevation amplitude. The optimum design method includes determining an array antenna geometrical structure, a horizontal array element gap and a pitching array element gap, wherein a rectangular unit grid serves as the array antenna geometrical structure; determining the aperture, the azimuth and the number of pitching array elements of an antenna; selecting the type of antenna array elements, and designing lobes of the antenna array elements; designing cosecant square lobes and wave beams under phase constraint conditions, and solving the array antenna structure and optimum design problems by a global optimal probability search algorithm; designing a feed network according to excitation amplitudes and phases of the array elements; integrating the array elements with the feed network, optimizing the feed network and each port phase, and fine-tuning the directional diagram of array beams to meet the requirements of the cosecant square lobes and the combined phases of the combined wave beams.

Description

technical field [0001] The invention relates to an optimal design method for a cosecant square and composite phase double-constrained lobe array antenna, belonging to the technical field of array signal processing. Background technique [0002] Three-coordinate radars usually use a pencil beam to measure the angle of a target for amplitude ratio or monopulse angle measurement. For antennas with pencil beams, the smaller the product of the azimuth beamwidth and the elevation beamwidth, the higher the antenna gain and the farther the target detection distance is, but the smaller the solid angle range covered by the beam is. In the case of a certain azimuth beam width, the number of beams covering the entire elevation angle space increases, and the data rate of the search space decreases. For air target search radar, in order to make the target detection at the same height and different distances have the same detection probability, the cosecant square lobe is often designed, ...

AI Technical Summary

Problems solved by technology

Multiple pencil-shaped beams scan to cover the elevation angle detection airspace to complete the height measurement of targets at different heights. The data rate of the search airspace is limited by the elevation angle beam width and elevation angle coverage

The cosecant square lobe can cover the entire elevation angle range in one scan, but it does not have the ability to measure angles by amplitude ratio and single pulse

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