Coherent Signal Direction of Arrival Estimation Method and System Without Source Number Estimation
A technology of direction of arrival estimation and coherent signals, which is applied in the field of direction of arrival estimation of coherent signals, can solve the problem that it is difficult to estimate the number of information sources effectively
Active Publication Date: 2018-08-17
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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[0004] In addition, the algorithms based on subspace have a fatal shortcoming: the number of signal sources needs to be pre-estimated
However, for coherent sources, it is still difficult for such algorithms to effectively estimate the number of sources
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[0074] The invention discloses a method for estimating the direction of arrival of a coherent signal without estimating the number of sources, comprising the following steps:
[0075] Consider a uniform linear array (ULA) with (2M+1) elements. Suppose there are P(P≤M+1) far-field narrowband signals from different directions {θ 1 ,…,θ P} incident on the array, the first K signals are mutually coherent, and the remaining (P-K) signals are mutually uncorrelated and independent of the first K signals. Let the first signal d 1 (t) as a reference signal, then the kth coherent signal can be expressed as
[0076]
[0077] Among them, ρ k Amplitude attenuation factor, δφ k is the phase change. In fact, ρ k and δφ k will not affect the coherence between the signals, so that The signal received by the mth array element can be expressed as
[0078]
[0079] Among them, d i (t) is the complex envelope of the i-th signal, λ is the carrier wavelength, Δ=λ / 2 is the spacing b...
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The invention provides a coherent signal wave direction-of-arrival estimation method and system without signal source number estimation. The coherent signal wave direction-of-arrival estimation method comprises the steps of initialization, covariance matrix calculation, Toeplitz matrix construction, intermediate variable construction, power spectrum calculation and searching. The coherent signal wave direction-of-arrival estimation method and system without signal source number estimation have the advantages that the signal source number does not need to be estimated, the advantages of the coherent signal wave direction-of-arrival estimation method and system without signal source number estimation are quite prominent in the actual application due to the fact that the signal source number is difficult to detect, and the effectiveness of the coherent signal wave direction-of-arrival estimation method and system without signal source number estimation is proved through simulation results.
Description
technical field [0001] The invention relates to the field of array signal processing, in particular to a method and system for estimating the direction of arrival of a coherent signal without estimating the number of sources. Background technique [0002] Angle of Arrival (DOA) estimation is an important branch of array signal processing, which is widely used in many military and national economic fields such as radar, biomedicine, exploration and astronomy. Traditional DOA estimation algorithms, such as the MUSIC algorithm and the ESPRIT algorithm, usually decompose the covariance matrix of the array received data into mutually orthogonal signal subspaces and noise subspaces, and use the orthogonality between the signal and noise subspaces to estimate the angle of arrival of the signal. However, due to the multipath propagation of the transmitted signal, the received data contains many coherent signals, resulting in the corresponding signal covariance matrix being rank def...
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IPC IPC(8): G06F19/00
Inventor 钱诚黄磊蒋双杨云川黄敏
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL