Monostatic co-prime MIMO array DOA estimation algorithm based on orthogonal propagation operator

Abstract

The invention belongs to the technical field of radar direction finding and relates to a monostatic co-prime MIMO array DOA estimation algorithm based on an orthogonal propagation operator. The algorithm comprises the following steps of: forming a monostatic MIMO array through employing a pair of single-row co-prime arrays as receiving and transmitting arrays; establishing a received signal model which has been subjected to after Doppler compensation and matched filtering, and performing covariance processing on received signals to obtain a covariance matrix; and solving a propagation operator by using the covariance matrix, constructing a noise subspace by using the propagation operator, carrying out orthogonalization processing on the noise subspace, and replacing a noise subspace in the MUSIC algorithm with the noise subspace subjected to orthogonalization processing to carry out orthogonal propagation operator spectral peak search. According to the algorithm provided by the invention, the transmitting and receiving arrays of an MIMO radar are arranged according to the rule of a co-prime array, so that the advantages of the co-prime array and the MIMO array are fully utilized; the DOF of the algorithm is greatly improved by utilizing the virtual array flow pattern matrix of the MIMO array; and the OPM algorithm avoids eigenvalue decomposition in the MUSIC algorithm.

Description

technical field [0001] The invention relates to the technical field of radar direction finding, in particular to a single base mutual prime MIMO array DOA estimation algorithm based on an orthogonal propagation operator. Background technique [0002] Multiple Input Multiple Output (MIMO) radar is a new type of radar that has been widely used in the field of communication in recent years. It can be traced back to the proposal of using multiple antennas on the transceiver side of the communication system proposed by Bell Labs in the mid-1990s. , until 2003, the concept of MIMO radar was formally proposed by relevant scholars. MIMO radar uses multiple array elements to simultaneously transmit and receive signals to perform centralized signal processing, which has significant advantages in applications such as increasing channel capacity, improving signal detection and target parameter estimation performance. [0003] Direction Of Arrival (DOA) estimation has a wide range of ap...

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Problems solved by technology

[0007] 2. The complexity of the uniform linear array MUSIC algorithm is extremely high, how to reduce the computational complexity of the algorithm;

[0008] 3. The accuracy of the uniform linear array MUSIC algorithm is low, that is, the root mean square error (Root Mean Square Error, RMSE) is large

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