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Linear sweep jamming suppression method and system using subspace projection

A subspace projection and interference suppression technology, applied in the field of signal processing, can solve problems such as difficult to eliminate interference

Active Publication Date: 2019-04-05
NAT UNIV OF DEFENSE TECH
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  • Application Information

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Problems solved by technology

When there is an error in the interference frequency parameter, there is a large error between the constructed interference subspace and the real interference subspace, so it is difficult to eliminate the interference by using the subspace projection method

Method used

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  • Linear sweep jamming suppression method and system using subspace projection
  • Linear sweep jamming suppression method and system using subspace projection
  • Linear sweep jamming suppression method and system using subspace projection

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Embodiment Construction

[0057] Figure 1 to Figure 7 A specific embodiment of a linear sweep interference simulation method using subspace projection is shown in the present invention. There are errors in the estimation of the interference parameters of the linear sweep LFM, and the subspace projection interference processing is performed with the method in Document 2, and a small error will cause the interference processing to fail. Therefore, the base vector length L of constructing the subspace has a great influence on the anti-jamming performance, and the present invention provides a method for estimating the optimal length for the linear sweep interference simulation. The following first provides the mathematical form of the signal to be processed and the present invention uses An example, and then give the processing steps.

[0058] Taking the GPS signal received by the M-element antenna array as an example for analysis, which navigation signal is used has the same processing method for anti-j...

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Abstract

The invention discloses a linear sweep jamming suppression method and system using subspace projection. The method comprises the following steps of 1, acquiring a receiving signal via an array antenna, and estimating the initial frequency and frequency modulation slope of LFM interference in the receiving signal; 2, building an interference subspace according to the estimated initial frequency andfrequency modulation slope: 2.1, estimating the length of a base vector of the subspace, 2.2, building a subspace base vector according to the estimated length of the base vector of the subspace, and2.3, building an interference subspace and an orthogonal subspace thereof; and 3, eliminating interference via a subspace projection method. According to the method and system provided by the invention, the situation that the good interference suppression effect cannot be achieved on the subspace projection when the length of the base vector is too long or too short under the condition that the frequency estimation has an error is found, the operation of finding the best sequence length is provided, and thus via the best sequence length L found by the method provided by the invention, the good interference suppression effect is acquired through performing subspace projection under the condition that the frequency estimation has the error.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a method and system for imitating linear frequency sweep interference using subspace projection. Background technique [0002] In the battlefield environment, there may be many types of non-stationary interference. For non-stationary interference, the method of dealing with stationary interference is not effective. Document 1 "D C Ricks, P G Cifuentes, J S Goldstein. What is Optimal Processing for Nonstationary Data[C] . Pacific Grove, CA: 34th Asilomar Conference on Signals, Systems, and Computers, 2000, 11, 656-661" analyzed and verified this by simulation. The most common type of non-stationary interference is linear frequency modulation (LFM: Linear Frequency Modulation), and the parameters of LFM interference are easy to estimate. Document 2 "Moeness G Amin, Zhao L, Lindsey A R. Subspace Array Processing for the Suppression of FM Jamming in GPS Receivers[J]. IEEE Transon Ae...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S19/21
CPCG01S19/21
Inventor 周柱张茂军刘煜
Owner NAT UNIV OF DEFENSE TECH