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Method for sparse synthetic aperture radars imaging on basis of echo simulation operators

A synthetic aperture radar, echo simulation technology, applied in the reflection/re-radiation of radio waves, radio wave measurement systems, and the use of re-radiation, etc., can solve the problems of high computational cost and difficult scene imaging.

Active Publication Date: 2013-01-02
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

However, the current sparse SAR imaging framework is based on the radar observation matrix obtained from two-dimensional precise radar observations. The calculation cost of solving this model is too large, and it is difficult to be used for imaging of large scenes.

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  • Method for sparse synthetic aperture radars imaging on basis of echo simulation operators
  • Method for sparse synthetic aperture radars imaging on basis of echo simulation operators
  • Method for sparse synthetic aperture radars imaging on basis of echo simulation operators

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Embodiment Construction

[0114] Various details involved in the echo simulation operator-based sparse SAR imaging method of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be pointed out that the described embodiments are only intended to facilitate the understanding of the method of the present invention, rather than limiting it in any way.

[0115] to combine figure 1 , the specific processing steps of the sparse SAR imaging algorithm based on the SAR echo simulation operator are

[0116] Step S1: Construct the echo simulation operator M, and establish the radar observation equation;

[0117] Step S2: According to the new radar observation equation, establish the L based on the SAR echo simulation operator q Regularized imaging model:

[0118] X * = arg min X ( | ...

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Abstract

The invention discloses a method for sparse synthetic aperture radar (SAR) imaging on basis of echo simulation operators and relates to the technology of the synthetic aperture radars. By utilizing SAR echo characters and sparsity of an observed scene, a sparse regularization model based on an SAR echo simulation operator is established. By coalesce of a threshold value iterative algorithm of the echo simulation operator, radar imaging on a target scene in the observed area is realized. Compared with an existing sparse SAR image method based on two-dimensional observation models, the method can improve operating efficiency and lowering operating cost, and compared with a matched filtering imaging method, under a controlled condition, the method is capable of realizing imaging on the condition of being lower than nyquist rate sample, restraining sidelobe and obtaining clearer SAR images.

Description

technical field [0001] The invention relates to the technical field of synthetic aperture radar, and relates to a sparse synthetic aperture radar (SAR) imaging method based on an echo simulation operator. Background technique [0002] Synthetic Aperture Radar (SAR), as an active microwave imaging system, has the characteristics of all-time, all-weather and high-resolution imaging. It has been widely used in many fields of military and national economy, such as military reconnaissance, environmental monitoring, land resource management and so on. With the development of SAR technology, the resolution and mapping bandwidth of the radar system are required to be continuously improved, and the bottleneck effect of large data volume is becoming more and more obvious. [0003] The recently emerging compressive sensing technology provides a basis for solving large data volume problems. Different from the traditional sampling method, compressed sensing takes advantage of the spars...

Claims

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Application Information

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IPC IPC(8): G01S13/90
Inventor 吴一戎徐宗本洪文张冰尘方健
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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