Actual-value ESPRIT non-circular signal angle estimation method for single-base MIMO radar

A non-circular signal and angle estimation technology, applied in the field of radar, can solve the problems of unfavorable algorithm real-time implementation, failure, and increase of algorithm calculation complexity

CN108303683AActive Publication Date: 2018-07-20XIAN UNIV OF POSTS & TELECOMM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-07-20

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Abstract

The invention, which belongs to the field of radar technology, discloses an actual-value ESPRIT non-circular signal angle estimation method for a single-base MIMO radar. Matched filtering is carried out on array element receiving data and a transmitted signal to obtain an observation data vector; dimensionality reduction preprocessing is carried out on the observation data to obtain a low-dimensional space receiving data vector; on the basis of a non-circular characteristic of the signal and an Euler formula, an actual-value receiving data vector with array aperture doubling is constructed; arotation invariance relationship of a virtual array with aperture extending is constructed; a covariance matrix of the extended receiving data is calculated and feature value decomposition is carriedout on the matrix, an actual-value signal sub space is estimated; new actual-value signal sub space is defined and a rotation invariance equation of the new actual-value signal sub space is calculated; and a DOA estimation value of the target is calculated. Therefore, the DOA estimation accuracy is improved obviously and the computational complexity of the ESPRIT algorithm is reduced substantially. The estimation method is suitable for the low-signal-to-noise-ratio and low-fast-beat-number occasions.
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Description

technical field

[0001] The invention belongs to the field of radar technology, in particular to a method for estimating the angle of a single-base MIMO radar real-value ESPRIT non-circular signal. Background technique

[0002] At present, the commonly used existing technologies in the industry are as follows: multiple input multiple output (MIMO) radar is a new radar system developed based on MIMO communication technology. Using the idea of ​​waveform diversity, MIMO radar uses multiple transmitting antennas to simultaneously transmit mutually orthogonal waveforms, and simultaneously uses multiple receiving antennas to receive target reflected signals. Compared with traditional phased array radar, MIMO radar has higher angular resolution and more degrees of freedom, and has better angle estimation performance. Direction of arrival (DOA) estimation is an important research content of MIMO radar parameter estimation. Rotation-invariant subspace technique (Estimate signal par...

Examples

Embodiment Construction

[0047] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0048] Such as figure 1 As shown, the monostatic MIMO radar real-valued ESPRIT non-circular signal angle estimation method provided by the embodiment of the present invention includes the following steps:

[0049] S101: Perform matching filtering on the received data of the array element and the transmitted waveform to obtain the observed data vector;

[0050] S102: Perform dimensionality reduction preprocessing on the observation data to obtain low-dimensional space received data vectors;

[0051] S103: Constructing a real-valued received data vector of doubling the array aperture by using the non-circular characteristic of...