A launch phase optimization method for mimo radar main lobe anti-jamming

Abstract

The invention discloses a transmitting initial phase optimization method for MIMO (Multiple-Input Multiple-Output) radar main lobe interference resistance. The main thought is that an MIMO radar is determined, the MIMO radar comprises a transmitting array and a receiving array, the transmitting signal initial phase of the transmitting array is set, and a cost function is determined; the transmitting signal initial phase of the transmitting array after linear phase constraints are added is acquired, an initial phase search range is then set, the transmitting signal initial phase initial value u0-tilde of the transmitting array is further obtained; a phase step length and the number of iterations D are set, k is made to represent a kth iteration, 1< / =k< / =D, and l is made to represent an lth element in the transmitting signal initial phase u<0><k-1>-tilde of the transmitting array after a (k-1)th iteration; according to the transmitting signal initial phase u<0><k-1>-tilde of the transmitting array after the (k-1)th iteration, the cost function value after the kth iteration is calculated; one is added to the l value, and when l is larger than M, the l value is initialized as one, one is added to the k value, the iteration is ended until k is larger than D, and the corresponding transmitting signal initial phase of the transmitting array corresponding to ending of the iteration serves as the transmitting signal optimal initial phase of the transmitting array.

Description

technical field [0001] The invention belongs to the technical field of radar anti-jamming, in particular to a method for optimizing the initial phase of transmission for MIMO radar main lobe anti-jamming, that is, a method for multiple-input multiple-output (Multiple-Input Multiple-Output, MIMO) radar main lobe The initial launch phase optimization method for anti-jamming is suitable for optimizing the initial launch phase at the radar transmitter to improve the anti-jamming performance of the main lobe. Background technique [0002] Due to the unique transmission and reception separation system adopted by MIMO radar, by transmitting mutually orthogonal signals at the transmitting end, the transmission pattern can be virtualized at the receiving end, which greatly improves the available degrees of freedom. Due to its special transmitting and receiving structure, Compared with traditional phased array radars, MIMO radars have unique advantages in improving resolution and anti...

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Problems solved by technology

[0004] At present, for MIMO radar systems, Hai Deng et al. have proposed a main lobe anti-jamming method by adding random initial phases at the transmitter. However, due to the uncertainty of random initial phases, random phase encoding performance is less stable. Poor, especially in the case of fewer array elements or more interference, this disadvantage is particularly obvious

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