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Array signal processing method including frequency and direction joint estimation

A technology of joint estimation and processing methods, applied in positioning, measuring devices, instruments, etc., can solve problems such as ESPRIT performance degradation, and achieve the effect of overcoming performance degradation, improving signal-to-noise ratio, and increasing operating distance.

Active Publication Date: 2018-11-30
NORTHWESTERN POLYTECHNICAL UNIV
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  • Claims
  • Application Information

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Problems solved by technology

In contrast, ESPRIT has lower computational complexity, but at low SNR, the performance of ESPRIT method decreases

Method used

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  • Array signal processing method including frequency and direction joint estimation
  • Array signal processing method including frequency and direction joint estimation
  • Array signal processing method including frequency and direction joint estimation

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Embodiment Construction

[0050] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0051] Describe in detail the concrete operation steps of the present invention below:

[0052] Step 1: A receiving array composed of 20 hydrophones, with an element spacing of 0.75 meters, receives signal and noise data from space, expressed as x(k)=s(k)+n(k), where s(k )=[s 1 (k),s 2 (k),...,s M (k)] T is the signal received by the array, and the signal received by the mth array element is denoted as s m (k)=A m sin[2πf(k-1) / f s +φ m ]+v m (k), A m 4v, φ m is 0rad, f s is 8000Hz, f is 1000Hz, v m The variance of (k) is 0.001. n(k)=[n 1 (k),n 2 (k),...,n M (k)] T is the Gaussian white noise received by the array, and the covariance matrix is ​​Q n . The time length of receiving data is 12.5s, and the number of sampling points is 100000;

[0053] Step 2: Construct the state equation, expressed as:

[0054] K Ts (k+1)=B(f)[K Ts (k)-v(k)]+v(k...

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Abstract

The invention relates to an array signal processing method including frequency and direction joint estimation. The array signal processing method comprises the steps that firstly, under the conditionof a plurality of assumed frequencies, a state equation and an observation equation are established specific to each assumed single-frequency signal, on the basis, the signal-to-noise ratio of the signals is increased through a Kalman filter, and then the direction of arrival (DOA) is obtained through a beam former; then, an objective function relevant to the assumed frequencies and the DOA is established; and finally, by maximizing the objective function, final frequency-DOA joint estimation is obtained. According to the array signal processing method including frequency and direction joint estimation, the root-mean-square error of frequency estimation and DOA estimation is reduced, frequency-DOA joint estimation in the low signal-to-noise ratio environment is achieved, the operating distance of receiving equipment is increased, and the problem that the parameter estimation property of an existing method is reduced under the low signal-to-noise ratio is solved.

Description

technical field [0001] The invention belongs to the field of array signal processing and relates to an array signal processing method for joint estimation of frequency and orientation. Background technique [0002] Parameter estimation is one of the main tasks in array signal processing, including frequency estimation, target orientation estimation (Direction of arrival, DOA), frequency-DOA joint estimation, etc. For example, in the radiated noise of ships and submarines, there is a single-frequency line spectrum signal, so it can be used to detect targets. However, in the working environment of the receiving array, when the distance between the receiving array and the target is relatively long, the signal-to-noise ratio received by the array is very low, and the working distance is limited. [0003] Frequency estimation is an important task in parameter estimation. Low signal-to-noise ratio will lead to performance degradation of some traditional frequency estimation meth...

Claims

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Application Information

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IPC IPC(8): G01S5/22
CPCG01S5/22
Inventor 夏麾军杨益新马远良
Owner NORTHWESTERN POLYTECHNICAL UNIV
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