Target parameter estimation method based on FDA-MIMO radar

Abstract

The invention belongs to the radar signal processing technology field and discloses a target parameter estimation method based on an FDA-MIMO radar. The method comprises the following steps of designing a frequency increment resulting in wave beam coupling and an array element spacing, breaking linearly increasing synchronization between the two, achieving a decoupling effect, and providing a condition for unique estimation of a target distance angle; and through designing, making the frequency increment of each array element satisfy a sinc function increasing relation, and then carrying outangle and distance estimation to obtain an accurate target angle and distance information. By using the method of the invention, coupling of an emission wave beam at a distance-angle can be solved. When the distances and the angles of multiple targets are different, the distance and the angle of the target is well estimated to avoid occurrence of false targets, and estimation performance of the radar is improved.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, in particular to a target parameter estimation method based on FDA-MIMO radar, which can be used for parameter estimation of FDA-MIMO system radar. Background technique [0002] Multiple-input multiple-output (English full name: Multiple-Input Multiple-Output, English abbreviation: MIMO) radar can provide flexible transmission beams according to different working modes, but similar to traditional phased arrays, MIMO radar transmission beams are only aligned with the target It is related to the angle of the target, and it is impossible to distinguish targets with the same angle but different distances. In addition, if there is interference from the same angle but different distances, the positioning performance of MIMO radar will be greatly affected. [0003] The concept of Frequency Diversity Array (full English name: Frequency Diverse Array, English abbreviation: FDA) was first ...

AI Technical Summary

Problems solved by technology

Some scholars have used nonlinear frequency offset methods to solve this problem, such as the square method, cubic method, log method, etc., to a certain extent, these methods have achieved the coupling of the FDA-MIMO system radar transmit beams, but different frequency offsets The target launch beam of the method will affect the performance of the beam, that is, the radar can only better estimate the parameters of a single target or the parameters of multiple targets at the same angle. When the distances and angles of multiple targets are different, false targets will appear. lead to a significant decrease in the estimation performance of the radar

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