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External radiation source radar direct wave recovery method adopting blind source separation

A technology of external radiation source radar and blind source separation, applied in radio wave measurement systems, instruments, etc., can solve problems such as increased false alarms in matched filter detection and decreased direct wave purity.

Inactive Publication Date: 2016-07-20
HOHAI UNIV
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Problems solved by technology

However, in the presence of co-channel interference, the purity of the direct wave decreases
This will result in increased false alarms for matched filter detection

Method used

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  • External radiation source radar direct wave recovery method adopting blind source separation
  • External radiation source radar direct wave recovery method adopting blind source separation
  • External radiation source radar direct wave recovery method adopting blind source separation

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Embodiment

[0146] The performance of the proposed cognitive ICA blind source separation algorithm is verified by computer simulation. In the simulation, the radar receiving array of the external radiation source of the floating platform adopts a 16-element half-wavelength equidistant linear array, and the beam forming beam of the array adopts 25dB Chebyshev weighting. The working frequency of the external radiation source radar is set at 93.7MHz, the reference station is located at 10°, and one co-frequency interference station is located at -10°. The multipath conditions of the receiving station are shown in Table 1. The target observation is located in the 30° direction. Target 1 is located at a bistatic distance of 150km, bistatic Doppler -200Hz, and target 2 is located at a bistatic distance of 175km, bistatic Doppler 119Hz. The data rate of the in-phase and quadrature components of the FM broadcast signal is 200kHz respectively, and the signal bandwidth is 20kHz. The ratio of the ...

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Abstract

The invention discloses an external radiation source radar direct wave recovery method adopting blind source separation. The method comprises the following steps that: (1) a linear array receives signals x1(n), ..., xN(n), and a digital wave beam is formed; (2) wave beam signals yS(n) of a reference radio station and wave beam signals y1(n), ..., yJ(n) of J interference radio stations are input into an instant ICA (independent composition analysis) blind source separation module, then output signals p0(n), p1(n), ..., pJ(n) of the blind source separation are sent to an ambiguity-resolving processing module, and obtaining the signal q(n) of the reference radio station; (3) yl(n) is input into a plurality FIR (finite impulse response) filters of a spatial domain-fast time domain module, two-dimensional self-adaptive filtering processing is carried out through a multi-dimensional spatial domain-fast time domain algorithm, and a monitoring channel signal z(n) is output and obtained; and (4) based on the signal q(n) of the reference radio station and the monitoring channel signal z(n), a time delay Doppler plane of a target is calculated. According to the invention, the sequence ambiguity problem of output signals of the blind source separation method is solved, and the reliable reference radio station direct wave recovery is ensured.

Description

technical field [0001] The invention relates to a method for recovering the direct wave of external radiation source radar using blind source separation, and belongs to the technical field of external radiation source radar on floating platforms. Background technique [0002] Floating platform radar refers to radar systems based on airships or hot air balloons. Compared with the ground radar system, this type of system is not affected by the curvature of the earth and shelters, and has a long observation distance. Therefore, after the radar based on the floating platform was proposed in the 1970s and 1980s, it has received a lot of research and application in many fields such as meteorological monitoring, mineral resource search, and missile early warning. Due to the limited lift, the load weight of the floating platform is strictly limited. Therefore, the application of active phased array radar on floating platforms is limited. The external radiation source radar (also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36
CPCG01S7/36
Inventor 王峰蒋德富
Owner HOHAI UNIV
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