Method and device for estimating direction of arrival
A direction of arrival estimation and direction of arrival technology, which is applied in the field of signal processing, can solve the problems that the estimation results are easily affected by external interference noise, do not consider external noise components, and erroneous estimation results, so as to achieve easy application promotion and stable results. , calculate the simple and effective effect
Active Publication Date: 2021-02-05
BEIJING INST OF AEROSPACE CONTROL DEVICES
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[0004] MUSIC is a high-resolution DOA algorithm. Its shortcoming is that the estimation result is easily affected by external interference noise, and may even lead to wrong estimation results in a strong noise interference environment.
[0005] The Sawada-ICA method is a DOA estimation method based on independent component analysis (ICA) in the time-frequency domain. Its shortcoming is that it does not consider the external noise component, resulting in poor practicability of the method, and it is necessary to manually select the frequency response function for estimation. , the efficiency is relatively low
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[0043] The present invention will be further described below in conjunction with the accompanying drawings.
[0044] figure 1 The flow chart of this method, a method for direction of arrival estimation, includes the following steps:
[0045] Step 1: lay out the sensor array, such as figure 2 As shown, the sensor array is composed of three linear arrays two by two orthogonal. According to the spatial Nyquist sampling law, the distance between the sensors in the linear array is less than half of the wavelength of the sound wave. In order to fully collect the spatial information of the sound field, the length of each linear array should be greater than two sound wavelength. The sensor array synchronously collects the acoustic signals of the measured sound source in the three directions of X, Y, and Z, and completes the analog-to-digital conversion of the acoustic signal through the AD acquisition module;
[0046] Step 2: Group the acoustic signal data collected in step 1 acco...
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The invention discloses a method and a device for estimating a direction of arrival. The method includes the following steps: using a three-axis acoustic array to synchronously collect the signals to be measured in the three directions of X, Y, and Z, performing two-dimensional Fourier transform and maximum value search on the collected signals, and calculating the obtained The scalar wavenumber component k of x 、k y 、k z Synthetic vector wave vector uses the relevant knowledge of space geometry to calculate the space angle and finally obtain the direction of arrival and other steps. The device includes an acoustic wave sensing module, an AD acquisition module, a data processing module, and a direction-of-arrival calculation module; it can realize two-dimensional direction-of-arrival estimation, with flexible use, stable estimation results, high precision, and good practicability.
Description
technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a method and a device for estimating a direction of arrival based on Fourier transform in space domain and time domain. Background technique [0002] Array signal processing is an important branch of signal processing and has been widely used in many fields such as radar, sonar, communication, seismic data processing and medical imaging. Direction of Arrival (DOA) estimation is a main research content of array signal processing, and it is widely used in radar, sonar, communication and other fields. DOA estimation is to determine the orientation of the signal and measure the direction of the signal from the received data. Array signal processing first requires the use of arrays to obtain multi-channel signals. Arrays are usually composed of multiple sensors according to a certain topology. Typical arrays include linear arrays, square arrays, or circular arra...
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IPC IPC(8): G01S3/802
CPCG01S3/8027
Inventor 王佳强朱炜炜曾笑尘王宇杨勇孙巧英
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES