One-dimensional DOA estimation method based on specific frequency combination signal

A technology of combining signals and specific frequencies, applied in the field of target positioning, which can solve the problems of array aperture loss and estimation accuracy decline.

Active Publication Date: 2020-05-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, selecting too few frequency points will lead to a decrease in estimation accuracy. At the same time, under the condition that the distance between adjacent array elements is kept constant, too much signal bandwidth will introduce too much array aperture loss.

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  • One-dimensional DOA estimation method based on specific frequency combination signal
  • One-dimensional DOA estimation method based on specific frequency combination signal
  • One-dimensional DOA estimation method based on specific frequency combination signal

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Embodiment 1

[0097] as attached image 3 As shown, this embodiment discloses a one-dimensional DOA estimation method based on multi-frequency transmission signals, including the following steps:

[0098] S1. Construct a time-domain data receiving model based on time-domain sampling data, and then use Fourier transform to obtain a frequency-domain data receiving model and a noise-free data covariance matrix

[0099] It is assumed that there are M array elements distributed on the uniform linear array used for one-dimensional DOA estimation, and the array element spacing is d. Set the narrowband transmission signals of P frequencies, where p, p=1, 2,..., the frequency of the P channel signal is f p . The received signal is the signal that the transmitted signal returns to the array after passing through K far-field targets. Through P narrow-band filters, H time-domain snapshots are sampled to obtain the time-domain received data matrix X, which is expressed as:

[0100]

[0101]where...

Embodiment 2

[0173] This embodiment discloses a one-dimensional DOA estimation method based on multi-frequency transmission signals, and the specific working steps are as follows:

[0174] T1. Assume that the number M of array elements in the uniform linear array is uniformly set to 6.

[0175] transmit signal as Frequency number P=2, frequency combination takes f=[f 1 ,f 2 ] T =[1,6] T kHz; the speed of sound is c=1500m / s, and the frequency of the combined signal data is unified as f after reconstruction 1 = 1kHz, so the minimum half wavelength is 0.75m. The distance between any two adjacent line arrays must be less than or equal to 0.75m. Under this restriction, the array element spacing can be selected arbitrarily, so the average spacing of two uniform line arrays is set to 0.75m, that is, the first array element and The last array element is separated by 3.75m. K=2 target sound sources are placed underwater, and the angles of arrival of the source and target signals are (20°, 6...

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Abstract

The invention discloses a one-dimensional DOA estimation method based on a specific frequency combination signal. The method includes: transmitting a plurality of signals with specific frequencies, separating corresponding frequency signals from received signals of each array element through a plurality of narrow-band filters with different frequencies to obtain a frequency domain receiving data model, then normalizing a source signal matrix and reconstructing a frequency domain received data matrix, subjecting a uniform physical array to primary expansion to form a virtual non-uniform array,finally performing secondary virtual expansion on the virtual non-uniform array in combination with an existing non-uniform array data covariance matrix processing method, thus finally obtaining a virtual uniform array subjected to secondary expansion, and realizing secondary expansion of the array aperture. Under the condition that a traditional uniform array structure does not need to be changed, virtual expansion of the array aperture is achieved by receiving a plurality of narrow-band signals with specific frequencies and depending on the prior information of frequency proportion, so thatthe estimation precision is improved.

Description

technical field [0001] The invention relates to the technical field of target positioning, in particular to a one-dimensional DOA estimation method for realizing virtual array element expansion after joint processing of specific frequency combination signals. Background technique [0002] Direction of arrival estimation (DOA estimation) has been widely used in many fields, and DOA estimation refers to the method of estimating the direction and angle of the source target by using array signal processing technology in space or placing sensor arrays. As the space environment becomes increasingly complex, determining the AOA of target signals in various aspects such as target tracking and precision guidance, and conducting comprehensive surveillance and reconnaissance are the primary prerequisites for gaining the initiative in war. Therefore, it is of great significance to study super-resolution and high-precision DOA estimation technology. [0003] The performance of the exist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/74
CPCG01S3/74Y02D30/70
Inventor 宁更新姜伸接赵雪瑾陈芳炯
Owner SOUTH CHINA UNIV OF TECH
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