Method for estimating target direction by multiple input multiple output (MIMO) radar

A radar target and radar echo technology, applied in the radar field, can solve the problems of slow calculation speed, low estimation accuracy, and too large number of virtual array elements.

Inactive Publication Date: 2010-08-11
XIDIAN UNIV
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Problems solved by technology

Although these methods can also be used to estimate the target direction of MIMO radar, however, due to the large number of elements in the virtual array of MIMO radar, MIMO radar has a high-dimensional data covariance matrix, so the above methods are used to estimate the target direction of MIMO radar. When estimating, the computational complexity of eigenvalue decomposition is very high, and the convergence speed of the estimated covariance matrix is ​​very slow, so that the calculation speed of the target direction estimation is very slow, and the estimation accuracy is not high

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[0035] Reference figure 1 The specific steps of the present invention are as follows:

[0036] Step 1. Perform range compression on the radar echo signal.

[0037] Suppose MIMO radar has M t Transmitting antennas, M r Two receiving antennas, the transmitted signal is Φ, and each row of Φ is orthogonal to each other, then the echo signal received by the radar is:

[0038] X ( k ) = X p = 1 P a ( θ p ) β p ( k ) b T ( θ p ) Φ + W ( k )

[0039] among them, a ( θ p ) A C M r × 1 with b ( θ p ) A C M t × 1 Are the receiving and transmitting steering vectors of the p-th target signal, C represents the complex domain, θ p Is the direction angle of the p-th target, P is the number of targets, k=1, 2,..., K represents the number of pulses, θ p Is the amplitude of the p-th target, W is white noise, and T is transpose.

[0040] Use Φ H (...

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Abstract

The invention discloses a method for estimating target direction by a multiple input multiple output (MIMO) radar, belonging to the technical field of radars and mainly solving the problem of limiting computation complexity, computation speed and estimation precision in the prior art. The method comprises the steps of: firstly, carrying out the distance compression on a radar echo signal; secondly, carrying out reduction of dimensionality on the compressed echo signal; thirdly, constructing a cost function to the echo signal subjected to the reduction of dimensionality according to the least squares criterion and solving by using a three-iterative approach; and fourthly, computing a direction-of-arrival angle of a target through computing a receiving and sending guide vector matrix by using an array popularity of a receiving array and a sending array. The invention has the advantages of low computation complexity, high computation speed and high estimation precision, and can be used for estimating the direction-of-arrival angle of the target of the MIMO radar.

Description

Technical field [0001] The invention belongs to the field of radar technology, and specifically is a method for estimating the direction of arrival of a target wave of a multiple-input multiple-output MIMO radar system. Background technique [0002] MIMO radar is a new system radar developed in recent years. The radar adopts space diversity and signal diversity technology, which can well overcome the performance loss caused by the angular scintillation of the target radar cross-sectional area RCS, and thus has advantages in target detection. Its unique advantages. MIMO radar uses multiple transmitting antennas to transmit linearly independent signals instead of transmitting coherent beams like traditional phased array radars. Generally, MIMO radars can be divided into two categories: one is non-coherent MIMO radar. The wide distance between the transmitting and receiving antennas can obtain the spatial diversity information of the target RCS, thereby improving the target detecti...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/292G01S13/06
Inventor 冯大政吕辉王艳苹李晓明刘宏伟贾建超
Owner XIDIAN UNIV
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