Low-complexity space target two-dimensional angle estimation method of L-shaped array MIMO radar

A low-complexity, two-dimensional angle technology, which is applied in the field of rapid two-dimensional angle estimation of space targets, and can solve problems such as real-time processing and large computational load of unfavorable radar systems.

Active Publication Date: 2014-07-02
HARBIN ENG UNIV
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Problems solved by technology

The scheme points out that the L-shaped array can improve the utilization rate of system degrees of freedom and increase the number of distinguishable targets under the condition that the actual number

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  • Low-complexity space target two-dimensional angle estimation method of L-shaped array MIMO radar
  • Low-complexity space target two-dimensional angle estimation method of L-shaped array MIMO radar
  • Low-complexity space target two-dimensional angle estimation method of L-shaped array MIMO radar

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Embodiment Construction

[0054]The present invention is described in more detail below in conjunction with accompanying drawing example:

[0055] combine Figure 1-7 , 1. Deduce the relationship between the joint steering vector of the target echo signal and the equivalent virtual array steering vector after the L-array MIMO radar matched filter

[0056] Such as figure 2 As shown in , the L-array MIMO radar is composed of two vertical half-wavelength uniform linear arrays with M and N co-located omnidirectional array elements, and its equivalent virtual array is a virtual array with 2M-1 and 2N-1 The L-shaped array and a (M-1)(N-1)-dimensional rectangular array. The steering vector of the target echo signal after matched filtering is

[0057] A ( μ , v ) = [ a ( μ 1 , v 1 ...

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Abstract

The invention aims to provide a low-complexity space target two-dimensional angle estimation method of L-shaped array MIMO radar. The method comprises the following steps that an L-shaped array is composed of two uniform linear arrays perpendicular to each other, the distance between every two adjacent array elements is a half of a wavelength, one linear array has M array elements, the other linear array has N array elements, all the array elements are receiving and sending co-located array elements, orthogonal narrow-band signals are sent, received signals are processed by means of matched filtering, and echo signals of a large-aperture virtual array are obtained; a dimensionality reduction array is designed, and dimensionality reduction is conducted on the echo signals; characteristic decomposition is conducted on a covariance matrix of dimensionality reduction signals, and a two-dimensional space spectrum function is obtained; a two-dimensional angle in the two-dimensional space spectrum function is decoupled, and space spectrum estimation is conducted on the angle of one dimension; an obtained space spectrum estimated value is substituted into the space spectrum function, and polynomial rooting estimation is conducted on the angle of the other dimension; according to the relation of trigonometrical functions, the azimuth angle and pitching angle of a target are obtained. The method greatly reduces computational complexity of algorithm, and is beneficial to real-time processing of a radar system.

Description

technical field [0001] The invention relates to a method for quickly estimating a two-dimensional angle of a space target. Background technique [0002] The concept of Multiple Input Multiple Output (MIMO) radar originates from the MIMO communication system, which has multiple transmitting antennas and multiple receiving antennas, and the transmitting signals are orthogonal to each other, and the signals are separated and processed by matched filtering technology at the receiving end. , forming a large-aperture virtual array, thereby improving the resolution of target angle estimation and increasing the freedom of the radar system. MIMO radar is mainly divided into co-site MIMO radar and statistical MIMO radar. The array structure of co-site MIMO radar is similar to that of phased array radar. Similar, so that the relevant technologies of traditional array signal processing can be applied to this type of MIMO radar, so as to obtain greater system freedom, higher spatial res...

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Application Information

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IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 王伟王晓萌李欣王咸鹏王志华王犇陈铮梁栋
Owner HARBIN ENG UNIV
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