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Airspace coverage enhancement method based on time diversity array subarray division

A technology of time diversity and coverage, applied to radio wave measurement systems, instruments, etc., can solve the problems of time diversity array full airspace coverage characteristic destruction, distance resolution decline, distance resolution difference, etc., to improve airspace coverage , improve the distance resolution, the effect of good performance

Active Publication Date: 2021-12-21
XIDIAN UNIV
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  • Claims
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Problems solved by technology

A time-diversity array can transmit a single waveform to achieve a full-angle transmission pattern. However, the distance resolution of the time-diversity array will decrease with the increase of the number of transmitting array elements. The more the number of transmitting array elements, the worse the distance resolution.
Therefore, the researchers divided the transmitting array into multiple sub-arrays, and the same signal was transmitted in the sub-arrays, and the time delay was introduced between the sub-arrays to reduce the number of accumulated items and improve the distance resolution. Interchangeability deteriorates, resulting in the destruction of the full airspace coverage of the time diversity array

Method used

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  • Airspace coverage enhancement method based on time diversity array subarray division
  • Airspace coverage enhancement method based on time diversity array subarray division
  • Airspace coverage enhancement method based on time diversity array subarray division

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Embodiment 1

[0056] See figure 1 , figure 1 It is a flow chart of a method for enhancing airspace coverage based on time-diversity array sub-array division provided by an embodiment of the present invention. The time diversity array airspace coverage enhancement method of the present embodiment includes:

[0057] S1: Divide the transmitting array elements of the MIMO radar into multiple sub-arrays;

[0058] Assuming that the MIMO radar includes M transmitting array elements, the M transmitting array elements are divided into K subarrays, and the kth (1≤k≤K) subarray includes M k (M k ≤M) array elements. Here we take regular sub-array division as an example, which means that the number of array elements M in each sub-array k all the same. For example, the time diversity array includes 20 transmitting array elements in total, which are divided into 5 sub-arrays. If divided according to rules, each sub-array includes 4 transmitting array elements.

[0059] S2: Introduce inter-subarray ...

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Abstract

The invention discloses an airspace coverage enhancement method based on time diversity array subarray division. The method comprises the following steps of: dividing a transmitting array element of an MIMO radar into a plurality of subarrays; introducing time delay between adjacent sub-arrays, and establishing a sub-array division time diversity array signal model; obtaining a multi-dimensional fuzzy function expression according to the sub-array division time diversity array signal model; according to the sub-array division time diversity array signal model, respectively changing the array element spacing in the sub-array and the spacing between adjacent sub-arrays, and obtaining a sub-array division multi-dimensional fuzzy function expression; and adjusting the airspace coverage range according to the subarray division multi-dimensional fuzzy function expression. According to the method, sub-array division is carried out on a plurality of transmitting array elements, the time delay is introduced between adjacent sub-arrays, the distance resolution can be improved, meanwhile, by changing the distance between the adjacent sub-arrays and the distance between the array elements in the sub-arrays, the distance resolution of the transmitting array elements can be improved, and meanwhile the airspace coverage range of the transmitting array elements in unit pulse time can be enlarged.

Description

technical field [0001] The invention belongs to the technical field of radar emission, and in particular relates to a method for enhancing airspace coverage based on time diversity array subarray division. Background technique [0002] MIMO (Multiple Input Multiple Output) radar has the advantages of many controllable degrees of freedom, higher distance and Doppler resolution, ability to distinguish multiple targets, and higher accuracy of target parameters, so future applications Broad prospects. MIMO radar systems can be subdivided into two categories: statistical (distributed) MIMO radar systems and coherent (centralized) MIMO radar systems according to the arrangement of antennas. [0003] In a distributed MIMO radar system, the transmitters are far apart in space, and the transmitter and receiver are usually tens or hundreds of kilometers apart. Each transmitter achieves full airspace coverage by transmitting orthogonal waveforms at different angles. The array configu...

Claims

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Application Information

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IPC IPC(8): G01S7/282
CPCG01S7/282
Inventor 朱圣棋谢佳宏王华柯许京伟王岩星
Owner XIDIAN UNIV
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