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Multiple Target Detection, Recognition and Two-Dimensional Angle Estimation Method for Ground Spread Spectrum Communication System

A two-dimensional angle, spread spectrum communication technology, applied in the transmission system, radio transmission system, diversity/multi-antenna system, etc., can solve the problems of large amount of calculation, multi-target angle estimation and mutual occlusion, etc., to achieve small amount of calculation, real-time good sex effect

Active Publication Date: 2021-08-03
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0005] The present invention proposes a method for multi-target detection, recognition and two-dimensional angle estimation in a ground-to-ground spread spectrum communication system, which solves the problem of large amount of computation and mutual occlusion in multi-target angle estimation in the prior art

Method used

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  • Multiple Target Detection, Recognition and Two-Dimensional Angle Estimation Method for Ground Spread Spectrum Communication System
  • Multiple Target Detection, Recognition and Two-Dimensional Angle Estimation Method for Ground Spread Spectrum Communication System
  • Multiple Target Detection, Recognition and Two-Dimensional Angle Estimation Method for Ground Spread Spectrum Communication System

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Embodiment 1

[0085] combine figure 1 As shown, this embodiment proposes a method for multi-target detection, identification and two-dimensional angle estimation in a ground spread spectrum communication system. combine figure 2 As shown, what is used in this embodiment is an equilateral triangular grid array structure with a radius of 0.6λ and N=19. Assuming that there is a single interference signal and a single user signal, the 19 array elements of the digital array are distributed in the Cartesian coordinate system xoy plane, and the baseband signal vector received by the array is x(t)=[x 1 (t), x 2 (t),...,x 19 (t)] T , two-dimensional angle Defined in polar coordinates. The specific steps are:

[0086] Step 1, baseband signal vector x (t)=[x 1 (t), x 2 (t),...,x 19 (t)] T Determine the data covariance matrix R, perform eigendecomposition on the data covariance matrix R, and use the information theory MDL criterion to detect and estimate the number of targets; in this embo...

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Abstract

The present invention proposes a multi-target detection, recognition and two-dimensional angle estimation method for the ground spread spectrum communication system, fully utilizes the space-time characteristics of the incoming wave signal, and constructs a time-space DOA matrix corresponding to the main eigenvector and the incoming wave guiding vector , and then use the array element phase information contained in the main eigenvector, combined with the defuzzification processing technology, to calculate the accurate two-dimensional angle of the incoming wave. The invention adopts the space-time DOA matrix method to estimate the interference / user angle, and can directly give the closed-form solution of the two-dimensional angle of each incoming wave without searching in the whole space, and the calculation amount is small; in addition, the interference supplementary space projection is performed on the received baseband data The processing can effectively suppress the impact on user angle estimation in the presence of strong interference.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method for multi-target detection, identification and two-dimensional angle estimation in a ground spread spectrum communication system. Background technique [0002] Medium and low orbit communication satellites have a large ground coverage angle (ie, pitch angle), such as an 850km orbit, and when the ground user elevation angle is 20°, the satellite’s ground coverage angle is close to 55°. In order to achieve ground communication within the entire coverage area , generally adopt low-gain weak directional antenna or simple shaped beam antenna. With the improvement of communication quality and speed requirements of communication systems, the demand for high-gain antennas is becoming more and more urgent. Digital array antennas using digital beamforming technology can form beams with flexible high-gain and multiple beams at the same time, which is the development ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/08H04B1/69
CPCH04B1/69H04B7/086
Inventor 马晓峰陈晓航盛卫星韩玉兵张仁李崔杰
Owner NANJING UNIV OF SCI & TECH
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