SAR radio frequency interference (RFI) inhibition method based on inclined projection filtering

A radio frequency interference and oblique projection technology, which is applied in the intersection of aerospace and microwave remote sensing, can solve the problems of space steering vector correlation interference suppression performance degradation, etc., and achieve the effect of good interference suppression effect and stable performance.

Active Publication Date: 2017-03-15
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

However, as the number of interference sources increases, the error introduced by the space-steering vector correlation will lead to the degradation of interference suppression performance

Method used

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  • SAR radio frequency interference (RFI) inhibition method based on inclined projection filtering
  • SAR radio frequency interference (RFI) inhibition method based on inclined projection filtering
  • SAR radio frequency interference (RFI) inhibition method based on inclined projection filtering

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Embodiment Construction

[0030] figure 1 It is a principle flow chart of the spaceborne SAR radio frequency interference suppression method provided by the present invention. The whole process can be subdivided into four steps: the first step: estimate the angle of arrival of RFI according to the received echo signal of SAR; the second step: establish the RFI subspace and low-order RFI subspace according to the angle of arrival of RFI; the third step Step 1: Construct oblique projection filter using RFI subspace and low-order RFI subspace; Step 4: Perform filtering operation on echo to complete RFI suppression.

[0031] Figure 2 to Figure 5 It is the result of point target simulation experiment. The parameters are set as follows: The parameters of the received echo signal of the known SAR are: the bandwidth is 60MHz, the carrier frequency is 550MHz, the oblique angle is 0 degrees, and the beam width is 1.12 degrees; the RFI parameters existing in the echo signal are known as: RFI interference sourc...

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Abstract

The invention provides an SAR radio frequency interference (RFI) inhibition method based on inclined projection filtering. The method provided by the technical scheme comprises the following steps: step one, according to SAR receiving echo signals, estimating a direction of arrival of RFI; step two, according to the direction of arrival of the RFI, establishing an RIF subspace and a low-order RFI subspace; step three, by use of the RFI subspace and the low-order RFI subspace, constructing an inclined projection filter; and step four, performing filtering operation on echoes so as to complete RFI inhibition. Compared to a conventional airspace filtering method, the method has the following advantages: the calculation process is not affected by increased errors introduced by space guiding vector correlation under the condition of existence of multiple interference sources, a better interference inhibition effect is realized, and an experiment result provides that the performance is stable.

Description

technical field [0001] The invention belongs to the intersecting technical field of aerospace and microwave remote sensing, in particular to a method for suppressing RFI (Radio Frequency Interference, radio frequency interference) in SAR (Synthetic Aperture Radar, synthetic aperture radar) data. Background technique [0002] SAR operating in the low-band is susceptible to interference from electromagnetic signals emitted by television networks, communication networks and other civilian equipment in the same frequency band, which is the so-called RFI. The presence of RFI seriously affects image quality as well as interpretation and interpretation. As the technology matures, the SAR system is developing from a single-channel system to a multi-channel system. While improving sensor performance, multi-channel SAR systems also provide more degrees of freedom for RFI suppression. The current RFI suppression methods for multi-channel SAR systems are mainly based on the correlatio...

Claims

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Application Information

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IPC IPC(8): G01S7/36G01S13/90
CPCG01S7/36G01S13/90G01S7/023
Inventor 张永胜吴鹏董臻张启雷黄海风余安喜何峰孙造宇金光虎何志华杜湘瑜
Owner NAT UNIV OF DEFENSE TECH
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