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Passive radar network centralized detection method based on distance weighting

A technology of passive radar and detection method, which is applied in the directions of measuring device, radio wave measurement system, radio wave reflection/reradiation, etc. It can solve the problems of poor target detection performance, easy implementation, and low system complexity. To achieve the effect of improving the target detection performance

Active Publication Date: 2021-06-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Although this decentralized decision-making fusion method can be widely used in practice due to the low complexity of the required system and the low difficulty of implementation, but in the case of low signal-to-noise ratio due to the large loss of mutual information in the fusion process, the overall Poor detection performance for objects

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  • Passive radar network centralized detection method based on distance weighting
  • Passive radar network centralized detection method based on distance weighting
  • Passive radar network centralized detection method based on distance weighting

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Embodiment Construction

[0076] The technical solution of the present invention will be further described in conjunction with the drawings and simulation below.

[0077] This example will use matlab to simulate and verify the proposed method.

[0078] Assuming that the number of Monte Carlo simulations is 100,000 times, assuming that there are 2 external radiation sources and 2 passive radar receivers in the passive radar network, the signal-to-noise ratios of the four direct waves are all dnr=-10dB, considering the target to the external radiation source The amplitude gain factor brought by the distance is a t,n =[1,2], the amplitude gain coefficient brought by the distance from the target to the receiver is a t,k =[1,2], the signal-to-noise ratio of the target echo is snr 11 =-20dB, snr 12 =-17dB, snr 21 =-17dB, snr 22 =-14dB.

[0079] Simulation case 1:

[0080] The signal length of the received signal, that is, the number of snapshots is from 150 to 500, and the constant false alarm probabi...

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Abstract

The invention belongs to the technical field of passive MIMO radar signal processing, and relates to a passive radar network centralized detection method based on distance weighting. For a passive radar network system with multiple external radiation sources and multiple passive radar receivers under a low signal-to-noise ratio, all preprocessed reference signals and monitoring signals are uploaded to a data processing center, and signals on different propagation paths are endowed with different weights by using implicit distance priori knowledge of a target position; and a signal model is established according to propagation attenuation characteristics of electromagnetic waves in space, and a constant false alarm detector is deduced based on a generalized maximum likelihood ratio test criterion, so that centralized joint detection is carried out. The method has the beneficial effects that the intensity of signals received by each receiver is considered, the intensity difference of each signal path is also considered, and the target detection performance in a passive radar network system is greatly improved under a low signal-to-noise ratio by using a centralized detection method.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, and in particular relates to a centralized detection method for passive radar networks based on distance weighting. Background technique [0002] Passive radar itself does not radiate electromagnetic waves, but uses electromagnetic waves emitted by other external radiation sources to detect targets. The passive radar network is composed of spatially separated receivers and non-cooperative external radiation sources. The specific radar network structure is as follows: figure 1 shown. While the carrier frequency, bandwidth, modulation type, and location of the noncooperative external radiating source are known, the modulated baseband signal is unknown. [0003] Passive radar detection and localization methods in the traditional sense are decentralized because the detection is performed solely by a bistatic pair consisting of an external emitter and receiver. The receiver uses a d...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/56
CPCG01S13/56Y02A90/10
Inventor 周亚文林仕文郭昱宁李万春高林
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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