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Signal detection method and system based on decision statistic design

A technology of decision statistics and signal detection, which is applied in radio wave measurement systems, calculations, and special data processing applications. The effect of the noise ratio

Active Publication Date: 2021-08-10
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

However, there are still some problems in these methods in practical applications. For example, the parametric method has a strong dependence on the model used, and the model parameters need to be extracted; the non-parametric method does not need to estimate the model parameters from the sensor data, because the underlying statistical information is not used. , not suitable for processing data with non-stationary background noise; statistical methods make full use of statistical characteristics, and use probability calculation methods to achieve signal enhancement, but need to rely on certain criteria to achieve the selection of the optimal structure
[0004] In summary, how to deal with the low signal-to-noise ratio and detect the signal is still a challenging problem

Method used

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  • Signal detection method and system based on decision statistic design
  • Signal detection method and system based on decision statistic design
  • Signal detection method and system based on decision statistic design

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Embodiment 1

[0080] Such as figure 1 As shown, Embodiment 1 of the present invention provides a signal detection method designed based on decision statistics.

[0081] Before the method of the present invention is described in detail, the signal detection flow chart of the method of the present invention will be described first. The data picked up by the sensor is firstly decomposed by the designed filter bank, and decomposed into sub-band data corresponding to the nonlinear frequency of the cochlea; then the intensity and stability information is used to form a decision statistic to extract component factors and construct a decision statistic; Finally, a nonlinear decision weighting method is used to enhance the signal.

[0082] The method of the present invention will be further described below.

[0083] Basic principle of Gammatone filter filter bank

[0084] In the human auditory system, signals of different frequencies can produce maximum responses at different locations of the coc...

Embodiment 2

[0123] Embodiment 2 of the present invention proposes a signal detection system designed based on decision statistics. The system includes: a signal detection system designed based on decision statistics, the system includes a gamma-pass filter bank, a normalization and decision statistics module, and a signal enhancement detection module; the specific processing method is the same as that in Embodiment 1.

[0124] The gamma-pass filter bank is used to perform frequency division band processing on the data picked up by the sensor to obtain data of each frequency band;

[0125] The normalization and decision statistics module is used to perform variance normalization processing on the data of each frequency band according to the difference in strength and stability between the signal and the background noise, and establish the decision statistics;

[0126] The signal enhancement detection module is used to perform judgment processing on the data of each frequency band according...

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Abstract

The invention relates to the field of sonar signal processing, in particular to a signal detection method and system based on decision statistic design. The method comprises the steps of employing a Gammatone filter group to carry out the frequency band processing of sensor pickup data, and obtaining the data of each frequency band, according to the difference between the signal and the background noise in intensity and stability, conducting variance normalization processing on each frequency band data, and establishing a judgment statistic amount, and performing judgment processing on each frequency band data according to the judgment statistics to realize signal enhancement and detection. According to the method, under the condition that a single filtering frequency band does not need to be searched, the signal-to-noise ratio of synthetic data is improved, and signal enhancement and detection are achieved.

Description

technical field [0001] The invention relates to the field of sonar signal processing, in particular to a signal detection method and system designed based on decision statistics. Background technique [0002] Signal detection plays an important role in areas such as radar, sonar, and speech. Therefore, how to accurately detect the signal of interest in the complex background has always been one of the research contents of signal processing in the fields of sonar, radar and speech. At present, the more classic and commonly used signal detection methods include cross-correlation detection method, square law detector method, energy accumulation detection method and so on. Among them, the energy accumulation detection method is widely used due to its low complexity. However, this type of detection method requires a certain signal-to-noise ratio. In the case of a low signal-to-noise ratio, the detection effect on unknown signals is poor, and certain filtering methods are requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/52G06F17/15
CPCG01S7/52G06F17/153
Inventor 郑恩明陈新华李嶷
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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