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Fractional order channelized separation method for reaching two linear frequency modulation (LFM) signals at the same time

A technology of linear frequency modulation signal and separation method, applied in digital transmission system, shaping network in transmitter/receiver, electrical components, etc., to achieve the effect of reducing difficulty, low computational complexity, and reducing interference

Inactive Publication Date: 2012-09-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0006] Aiming at the reconnaissance and reception of broadband LFM signals in a dense signal environment, the present invention proposes a fractional order channelization separation method that simultaneously arrives at two linear frequency modulation (LFM) signals

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  • Fractional order channelized separation method for reaching two linear frequency modulation (LFM) signals at the same time
  • Fractional order channelized separation method for reaching two linear frequency modulation (LFM) signals at the same time
  • Fractional order channelized separation method for reaching two linear frequency modulation (LFM) signals at the same time

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[0104] The present invention will be described in detail below in conjunction with accompanying drawing and embodiment, also described the technical problem and beneficial effect that the technical solution of the present invention solves simultaneously, it should be pointed out that described embodiment is only intended to facilitate the understanding of the present invention, and It has no limiting effect on it.

[0105] The flow chart of the fractional order channelization separation method for simultaneous arrival of two LFM signals proposed by the present invention is as follows: figure 1 shown. First, according to the modulation frequency μ of the two LFM signals 1 (μ 1 >0), μ 2 (μ 2 >0), select their respective fractional Fourier transform order p 1 ,p 2 , and the counterclockwise rotation angle α of the fractional Fourier domain relative to the Fourier domain 1 =p 1 π / 2, α 2 =p 2 π / 2; time-domain sampling interval Δt, sampling frequency Fs=1 / Δt, channel numbe...

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Abstract

The invention discloses a fractional order channelized separation method for reaching two linear frequency modulation (LFM) signals at the same time, which belongs to the technical field of radar signal reconnaissance. The parameters which reach the two signals at the same time are analyzed by utilizing the energy focusing characteristic of fractional fourier transform on non-stable signals, the different combinations of the two signals are judged, the interference of one signal to the other signal which is separated is greatly reduced through quasi focusing fractional order channelized extraction, limit order fractional order channelized extraction, secondary fractional order fourier domain filtering and other different separation methods, so that difficulty is reduced for follow-up signal processing; and fast Fourier transform algorithm can be adopted for realizing the reduction of the difficulty, so that the computing complicacy is low, and an effective tool is provided for the effective interception of the broadband LFM signals in radar reconnaissance.

Description

technical field [0001] The invention relates to a fractional-order channelization separation method for simultaneously arriving two linear frequency modulation (LFM) signals, belonging to the technical field of radar signal reconnaissance. Background technique [0002] In recent years, with the continuous development of radar technology and the increasingly complex electromagnetic environment, radar reconnaissance receivers are always faced with a complex reconnaissance environment with high density, multiple forms, and multiple signals, which makes reconnaissance receivers in non-cooperating parties increasingly confronted with severe challenges. Radar signals covering a wide frequency range require a receiver with a wide instantaneous bandwidth. Facing a high-density signal environment, it is very likely that radar reconnaissance receivers will receive signals from multiple radars in the same direction at the same time. In addition, there may be many interfering signals m...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L5/00
Inventor 陶然赵兴浩罗宇孟祥意
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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