Signal number detection method in the case of mixed incoherent and coherent signals
A coherent signal and detection method technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc.
Active Publication Date: 2017-09-08
RES INST OF XIAN JIAOTONG UNIV & SUZHOU
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[0005] Although in 2012 H.Tao et al proposed a new mixed signal number detection algorithm (see H.Tao, J.Xin, J.Wang, N.Zheng, and A.Sano "Estimation of the number of narrowband signals in the presence of multipath propagation," in Proc.IEEE 7th Sens.Array and Multichannel Signal Process.Workshop, pp.497-500, Hoboken, NJ, 2012.), this algorithm can only solve the case where uncorrelated signals and a group of coherent signals are mixed The number estimation problem of
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[0146] Such as figure 1 with figure 2 as shown, figure 2 is a flow chart showing an overview of the detection of the number of mixed sources according to an embodiment of the present invention. figure 1 is the geometry diagram of the biparallel linear array representing the population estimation method. The specific plan is described as follows:
[0147] 1. Data model and problem description
[0148] Such as figure 1 As shown, the dual parallel sensor array is placed on the x-y plane and consists of two uniform linear arrays, each uniform linear array contains M omnidirectional sensors with a spacing of d y , the spacing between columns is d x . Suppose K narrowband signals {s k (t)} by K n incoherent signal and K h consists of coherent signals from different elevation and azimuth angles {(a k ,β k )} incident on the array, K=K n +K h . Assume there are P groups of coherent signals, and each group consists of independent sources s hp Formed by multipath pro...
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The invention discloses a signal number estimation method applied in incidence of incoherent signals and multiple groups of coherent signals on the basis of uniform linear arrays. After an outer-product matrix based on a cross covariance matrix of received signals of two linear arrays is acquired, a first combined matrix is constructed by the cross covariance matrix and a transformation matrix thereof, and an outer-product matrix of the combined matrix is acquired, the number of the incoherent signals and the number of the groups of coherent signals can be acquired according to the rank of the two outer-product matrixes. Further, a new oblique projector is estimated to suppress the incoherent signals of data of the received array, a series of cross covariance matrixes composed of data of one uniform linear array and a series of sub-arrays of the other uniform linear array form a new combined matrix, and the rank of the outer-product matrix of the combined matrix is equal to the number of the coherent signals. According to great quantities of experiments, the signal number estimation method with less snapshots and low signal-to-noise ratio is superior to the MDL / AIC method, the MENSE method and the SRP(smoothed rank profile test) which are subjected to the FBSS (front-rear space smooth) preprocess.
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technical field [0001] The invention belongs to the technical field of array signal processing, and in particular relates to a method for detecting the number of signals in the case of mixed non-coherent and coherent signals. Background technique [0002] The two main research directions of array signal processing are signal number estimation and signal direction estimation. The signal number estimation is the basis of direction estimation. When the signal number estimation is inaccurate, the signal direction estimation will be seriously affected. Therefore, it is of great significance to study an efficient and accurate signal number estimation algorithm. [0003] Among the signal number detection algorithms, the most classic ones are algorithms based on information theory criteria, including algorithms based on AIC criteria and MDL criteria. However, in practice, due to the existence of multipath transmission effects, the incident signals are often completely correlated (t...
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IPC IPC(8): G06F19/00
Inventor 陈可辛景民陶浩郑南宁
Owner RES INST OF XIAN JIAOTONG UNIV & SUZHOU