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A Broadband Signal Detection Method Based on Beamforming Output Power Combination

A technology of output power and broadband signal, which is applied in transmission monitoring, transmission system, diversity/multi-antenna system, etc. It can solve the problems of signal detection performance loss and omission of other power information, and achieve accurate detection and low computational complexity.

Active Publication Date: 2020-07-24
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since this method only uses the maximum and minimum power, the remaining power information is missed, resulting in a loss of signal detection performance.

Method used

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  • A Broadband Signal Detection Method Based on Beamforming Output Power Combination
  • A Broadband Signal Detection Method Based on Beamforming Output Power Combination
  • A Broadband Signal Detection Method Based on Beamforming Output Power Combination

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Embodiment Construction

[0032] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0033] Derivation of approximate expression of beamforming output power:

[0034] Assuming that the receiving array is M-elements, it can be placed in any and unambiguous model. Consider K far-field broadband fully polarized signals incident on such as figure 1 In the M-element array shown, the array samples the received far-field broadband fully polarized signal according to time to obtain T snapshot data, and constructs the observation vector x(t) according to each snapshot data, specifically:

[0035]

[0036] Among them, n(t) is zero-mean complex Gaussian white noise; s k (t) is the incident kth far-field broadband fully polarized signal sampled at time t.

[0037] In general, if a scalar array is used, s k (t) can be expressed as follows

[0038]

[0039] If a polarized array (crossed dipole array) is used, s k (t) can be expressed as follo...

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Abstract

The invention provides a broadband signal detection method based on a beam forming output power combination. The specific process is as follows: 1. the far-field broadband complete polarization signalreceived by the array is sampled; the spatial domain time delay corresponding to the current interested scanning angle is eliminated to obtain a time delay part only containing a carrier frequency and taking the time delay part as a weight vector for beam forming, beam forming output power is estimated according to the weight vector, and the beam forming output power corresponding to different scanning angles is combined to construct a signal inspection statistic; And the statistical magnitude is compared with the reciprocal of the number of times of beam scanning, and whether a signal existsis judged according to a comparison result. The method is low in calculation complexity, and signals can be accurately detected.

Description

technical field [0001] The invention belongs to the technical field of array signal processing, in particular to a broadband signal detection method based on beamforming output power combination. Background technique [0002] At present, array signal detection is widely used in many fields, such as radar, sonar, electronic surveillance and cognitive radio, etc. Generally, signal detection is based on constant false alarm probability detection (CFAR) or generalized likelihood ratio test (GLRT) methods, and the commonly used methods are based on beam scanning or spatial filtering methods, and signal detection is performed at each spatial interval. In addition, many scholars have also conducted research on energy-based signal detection methods. [0003] Traditional algorithms for array signal detection are mostly based on energy or beam output power, and a signal detection based on the test statistic of the above output energy is proposed. The document "Blind Energy-based Det...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/309H04B17/391H04B7/06
Inventor 刘志文赵康徐友根
Owner BEIJING INSTITUTE OF TECHNOLOGYGY