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Direct wave and method for inhibiting multi-path interference of direct wave

A multi-path interference and direct wave technology, applied in radio wave measurement systems, instruments, etc., can solve problems such as difficult real-time processing, poor consistency of echo channel frequency characteristics, and high-order adaptive filter calculations.

Inactive Publication Date: 2013-10-09
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0008] The purpose of the present invention is to propose a method for suppressing direct wave and its multipath interference, which is suitable for digital TV external radiation source radar. The purpose of this method is to solve the frequency characteristics consistency of direct wave channel and echo channel under broadband signals Variation, the problem of affecting the cancellation performance; and under the broadband signal, the high-order adaptive filter has a large amount of calculation, and the problem of real-time processing is difficult

Method used

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  • Direct wave and method for inhibiting multi-path interference of direct wave
  • Direct wave and method for inhibiting multi-path interference of direct wave

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Embodiment

[0111] Using digital TV signal, the configuration diagram of the radiation source radar system is as follows: figure 1 As shown, the transmitting station is a non-cooperative irradiation source (external radiation source), and the receiving station has two receiving antennas. One direct wave antenna points to the radiation source to receive the signal transmitted by it, and the other echo receiving antenna points to the search space to receive the reflected signal from the target. Signal. While the echo receiving antenna receives the reflected echo of the moving target, its side lobe also receives the strong direct arrival wave interference directly emitted from the external radiation source. In addition, the signal transmitted from the external radiation source from the main lobe passes through multiple Multipath interference caused by scattering from tall buildings, mountains, etc.

[0112] Using digital TV signal, bandwidth 7.56MHz, baseband data sampling rate 9MHz:

[01...

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Abstract

The invention relates to a direct wave and a method for inhibiting multi-path interference of the direct wave, and belongs to the technical field of radar target acquisition. According to the method, sub-bands adapt to RLS plus NLMS filtering by itself. The method comprises the steps that (1) the sub-bands are decomposed, (2) signals of all the sub-bands respectively pass through the RLS plus NLMS filtering, and (3) the sub-bands are integrated. The method improves the consistency of frequency characteristics between passages of the direct wave and an echo, improves the offset performance of a system, largely reduces the calculation amount of a self-adaptation offset algorithm under wideband signals, and has a high convergence rate and good tracking capacity when an antenna carries out scanning work.

Description

technical field [0001] The invention relates to a method for suppressing direct wave and its multipath interference. The method adopts sub-band self-adaptive RLS plus NLMS filtering method, belongs to the technical field of radar target detection, and especially relates to the external radiation source when using digital TV signal as the irradiation source. A radar system direct wave and its multipath interference suppression method. Background technique [0002] The external radiation source radar itself does not emit signals, but uses widely distributed civilian broadcasting equipment (television, radio, etc.) Configure as figure 1 shown. In addition to receiving the signal reflected by the target, the echo antenna will also enter the direct wave and its multipath interference from its sidelobe and main lobe. The power of these interference signals is generally 30dB higher than the power of the target echo signal. suppressed, the target cannot be detected. Therefore, a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36
Inventor 单涛陶然卓智海刘升恒冯远张建
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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