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Space-time coding-based frequency diversity array radar distance resolution enhancement method

A frequency diversity array and range resolution technology, which is applied in the field of frequency diversity array radar range resolution enhancement based on space-time coding, radar range resolution enhancement, and frequency diversity array transmit diversity field, which can solve the difficulty of target detection, positioning and identification. , The reduction of range resolution is not conducive to high-precision parameter estimation, and the reduction of range resolution, etc.

Active Publication Date: 2021-08-10
XIDIAN UNIV
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Problems solved by technology

The transmission signal of the frequency diversity array is processed by matched filtering at the receiving end to form an equivalent transmission beam. The equivalent transmission bandwidth corresponding to the main lobe of the beam decreases compared with the transmission signal bandwidth, which directly leads to a decrease in distance resolution.
The decrease in distance resolution is not conducive to the high-precision parameter estimation of the target, and also makes it difficult for subsequent target detection, positioning and recognition.

Method used

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  • Space-time coding-based frequency diversity array radar distance resolution enhancement method
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  • Space-time coding-based frequency diversity array radar distance resolution enhancement method

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Embodiment Construction

[0022] Embodiments of the present invention will be described in detail below in conjunction with examples, but those skilled in the art will understand that the following examples are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention.

[0023] refer to figure 1 A method for enhancing range resolution of a frequency diversity array radar based on space-time coding provided by the present invention comprises the following steps:

[0024] Step 1. It is assumed that the transmitting end of the frequency diversity array radar is composed of M transmitting array elements, and the array elements are equidistantly distributed at half-wavelength intervals; all transmitting array elements transmit signals simultaneously, and the carrier frequency of each transmitting array element has Fixed frequency offset; obtain the transmit signal of each transmit array element, and then obtain the transmit combined signal of ...

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Abstract

The invention belongs to the technical field of radar signal processing, and particularly discloses a space-time coding-based frequency diversity array radar distance resolution enhancement method, which comprises the following steps of transmitting a linear frequency modulation signal through a frequency diversity array, and obtaining an angle-frequency two-dimensional frequency spectrum of a transmitting directional diagram through a stationary phase principle, designing two-dimensional space-time coding by analyzing the linear relation between the angle and the frequency, shifting effective frequency bands corresponding to the pulses through the two-dimensional space-time coding, and improving the range resolution through coherent pulse accumulation synthesis bandwidth.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, in particular to a frequency diversity array transmit diversity technology, specifically a space-time coding-based frequency diversity array radar range resolution enhancement method, which can be used for radar range resolution enhancement. Background technique [0002] The concept of frequency diversity array radar was proposed by Antonik and Wick et al. at the IEEE International Radar Conference. Compared with the traditional phased array radar with fixed transmission frequency and single-angle pointing transmission beam, there is a small frequency shift in the carrier frequency of the transmission signal between adjacent channels of frequency diversity array radar, which can form a distance-angle two-dimensional coupling Launch pattern. Compared with the transmission mode of the traditional multiple-input multiple-output MIMO radar orthogonal waveform group, each array elemen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/10
CPCG01S13/106
Inventor 王华柯全英汇廖桂生
Owner XIDIAN UNIV
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