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Coherent distributed wideband chirp information source orientation method

A distributed information source and source location technology, applied in the field of spatial parameter estimation of distributed information sources, can solve the problem of not being able to directly promote the broadband field, and achieve the effect of improving the estimation performance.

Inactive Publication Date: 2015-03-25
TIANJIN UNIV
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Problems solved by technology

Under the condition of broadband signal incidence, the direction vector of the distributed source model is related to the time parameter, so the traditional distributed narrowband source estimation algorithm cannot be directly extended to the broadband field

Method used

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  • Coherent distributed wideband chirp information source orientation method
  • Coherent distributed wideband chirp information source orientation method
  • Coherent distributed wideband chirp information source orientation method

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Embodiment Construction

[0026] refer to figure 1 , a method for locating a coherent distributed broadband chirp source of the present invention is illustrated, and its specific implementation steps are as follows:

[0027] Step 1: Assuming that the antenna array with p array elements receives q distributed broadband source incidents, the distributed broadband source model in the time domain can be expressed as:

[0028]

[0029] Among them, x(t) is the complex envelope output on the antenna array, t is the time parameter, is the direction vector of the array, which is time-varying. is the i-th source in the direction The angular signal density of , Θ∈(-π / 2,π / 2), when the incident source is a coherent source, then Among them, s(t) is a random variable reflecting the time characteristics of distributed sources, is the deterministic angular signal density function, ψ i is the parameter vector reflecting the spatial distribution characteristics of the source whose i-th source is unknown, and...

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Abstract

The invention provides a coherent distributed wideband chirp information source orientation method. The method comprises the steps of establishing distributed wideband information source models in a time domain and a fractional order domain; obtaining multiple spectrum peak values based on the energy aggregation property of a chirp signal through two-dimensional searching on a time-frequency plane; determining the number of distributed information sources by calculating the number of spectrum peaks; conducing filtering on each distributed information source in the corresponding energy aggregation domain, and conducting spectrum peak searching according to the dechirp property of the distributed information source with the classic distributed narrow-band information source space parameter estimation (DSPE) algorithm so as to determine spatial parameters and achieve information source orientation. Compared with traditional coherent signal-subspace methods, the coherent distributed wideband chirp information source orientation method has the advantages that centric angle estimation accuracy is higher, and orientation of a distributed information source with the number of incidence information sources larger than that of array elements can be achieved.

Description

technical field [0001] The invention belongs to the field of array signal processing and relates to a space parameter estimation method of distributed information sources. Background technique [0002] At present, most signal DOA estimation algorithms are based on the assumption of an idealized far-field point source. Under this assumption, there is only line-of-sight propagation between the source and the receiving array, and the signal strength of the direct wave is large enough that most of the energy of each source is considered to come from the same angle. However, actual targets often have more complex spatial distribution characteristics than point sources. For example, the riverbed reflection signal received by the underwater echo detector, the echo source reflected by the sea surface in low-elevation radar target tracking, the scattered signal source in the troposphere or ionosphere radio propagation, and the low-altitude wireless link formed by ground reflection ...

Claims

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Application Information

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IPC IPC(8): G01S5/02
CPCG01S5/02
Inventor 于洁潇刘开华张良
Owner TIANJIN UNIV
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