Multi-input and multi-output fast estimation method for radar receiving and transmitting angles under color-noise environment

A radar transceiver and multi-input technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as impracticality

Inactive Publication Date: 2013-07-24
HARBIN ENG UNIV
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Problems solved by technology

However, the above methods have special requirements on the number of trans

Method used

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  • Multi-input and multi-output fast estimation method for radar receiving and transmitting angles under color-noise environment
  • Multi-input and multi-output fast estimation method for radar receiving and transmitting angles under color-noise environment
  • Multi-input and multi-output fast estimation method for radar receiving and transmitting angles under color-noise environment

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Embodiment Construction

[0087]The following will describe the present invention in more detail in combination with the implementation flow chart and examples.

[0088] Step 1. The receiving end collects the echo signal of each receiving array element through the A / D sampling module

[0089] Assuming that the bistatic MIMO radar is composed of M transmitting array elements and N receiving array elements, and both the transmitting and receiving arrays are half-wavelength uniform equidistant linear arrays, and all array elements are omnidirectional, d t and d r are the spacing between the transmitting and receiving array elements respectively, then the echo signal x(l,t) of each receiving array element collected by the A / D sampling module at the receiving end can be expressed as

[0090]

[0091] In the formula: and θ are the emission angle and reception angle of the pth target respectively; a(θ)=[1,exp(-j2π(d r / λ)sinθ),...,-j2π(d r / λ)(N-1)sinθ)] T is the receiving steering vector of N×1 dime...

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Abstract

The invention provides a multi-input and multi-output fast estimation method for radar receiving and transmitting angles under color-noise environment. The multi-input and multi-output fast estimation method comprises the following steps of: (1) carrying out matching and filtering on echo signals of all receiving array elements acquired by an A/D sampling module and obtaining received data of a virtual array; (2) carrying out rearrangement on the received data of the virtual array; (3) respectively carrying out subarray division on the received data and a rearranged matrix and meeting the characteristic of constant rotation of a transmitting end and a receiving end; (4) constructing two four-order cumulant matrix pairs; (5) obtaining signal subspaces including the characteristic of constant rotation in transmitting and receiving respectively by characteristic values; (6) estimating the receiving and transmitting angles of a target by utilizing an ESPRIT algorithm; and (7) realizing correct pairing of the receiving and transmitting angles by utilizing a maximum likelihood estimation method. The multi-input and multi-output fast estimation method provided by the invention has the advantages that the influence of Gaussian color noise can be effective inhibited, no special requirement exists for the quantity of transmitted/received array elements, the estimation accuracy is high, and the computation complexity is low, so that the multi-input and multi-output fast estimation method can be used for positioning targets on sea or at low altitude in tracking and guidance.

Description

technical field [0001] The invention relates to a method for estimating the receiving and receiving angles of bistatic MIMO radars. Background technique [0002] Multiple-input multiple-output (MIMO) radar is a new system radar with high detection performance that is proposed by referring to the multiple-input multiple-output technology in the field of communication. Compared with the traditional phased array radar, MIMO radar transmits mutually orthogonal waveforms at the transmitting end, and can form a large virtual array aperture through matched filtering at the receiving end, which improves the spatial resolution of the detection target and also increases the Radar degrees of freedom. At present, MIMO radar is mainly divided into the following two types. One is co-site MIMO radar, that is, single / bistatic MIMO radar. The cross signal is matched at the receiving end to form a very long virtual array. These virtual array elements can form a narrow-band beam with low sid...

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Application Information

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IPC IPC(8): G01S7/41
Inventor 徐定杰李沫璇王伟王咸鹏宋金阳王志华李强马跃华王金龙
Owner HARBIN ENG UNIV
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