Dual parallel antenna array-based coherent distributed non-circular signal DOA estimation method

A non-circular signal, distributed signal source technology, applied in radio wave measurement system, direction determination direction, complex mathematical operation and other directions, can solve the problems of complex parameter estimation and excessive calculation amount.
CN109782218AInactive Publication Date: 2019-05-21CHINA ACADEMY OF SPACE TECHNOLOGY
12 Cites 8 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA ACADEMY OF SPACE TECHNOLOGY
Publication Date
2019-05-21
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to a dual parallel antenna array-based coherent distributed non-circular signal DOA estimation method, which belongs to the field of array signal processing. The two-dimensionalDOA estimation method for coherent distributed non-circular signals comprises steps: an array output matrix is calculated by using two parallel uniform linear arrays; by using the non-circular characteristics of a source, an extended output matrix is constructed; four selection matrices are set, and an extended steering vector array has rotational invariance; the covariance matrix of an extended array output matrix is calculated; the covariance matrix is subjected to eigenvalue decomposition to obtain signal subspace; an equivalent matrix is calculated, the equivalent matrix is subjected to eigenvalue decomposition respectively, eigenvalues are paired, and estimation on an azimuth angle and a pitch angle are realized. By using the non-circular characteristic of the signal, the number of array elements is extended virtually, and the estimation performance is improved.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a method for estimating DOA of a coherent distributed noncircular signal based on a double-parallel antenna array, belonging to the field of array signal processing. Background technique

[0002] In the field of array signal processing, many classical DOA estimation algorithms assume that the target source is a point source, that is, the energy of the source is concentrated at a discrete angle. However, in the field of practical applications such as low-angle tracking radar, sonar imaging, ionospheric radio propagation, and mobile communication positioning, the scattering of the target signal makes the energy of the source reach the receiving end in a continuous direction within a certain range, which leads to signal loss. The angular spread of the source energy, at this time the target source cannot simply be considered as a point source, but a parameterized distributed source model needs to be established. The parameter esti...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More