Satellite-borne synthetic aperture radar (SAR) imaging method based on Doppler cubic term estimation

A Doppler cubic term and synthetic aperture radar technology, which is applied in the field of signal processing, can solve problems such as asymmetric distortion, target ghosting, and affecting imaging quality, and achieve strong practicability, strong practicability, and improved iteration efficiency. Effect
CN102879780AActive Publication Date: 2013-01-16BEIHANG UNIV
2 Cites 7 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIHANG UNIV
Publication Date
2013-01-16

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a satellite-borne synthetic aperture radar (SAR) imaging method based on Doppler cubic term estimation. The method comprises the following steps of: 1, reading echo simulation data of a satellite-borne SAR sliding beam bunching mode; 2, processing the echo simulation data, and thus obtaining a two-dimensional frequency domain signal; 3, setting a Doppler cubic term initial value, an iteration threshold and an iteration step length; 4, acquiring a signal which is subjected to distance compensation; 5, acquiring an imaging result signal; 6, acquiring the maximum value and position of a one-dimensional signal; 7, acquiring a left first side lobe peak of a one-dimensional signal main lobe; 8, acquiring a right first side lobe peak of the one-dimensional signal main lobe; 9, acquiring an absolute value of difference between the left first side lobe peak and the right first side lobe peak; and 10, comparing the absolute value with a threshold Th, and judging according to a comparison result. The method has the advantages that a high-accuracy Doppler cubic term is obtained by using an iteration method, phase errors brought by the conventional slope distance model under the condition of high resolution are compensated, and a satellite-borne SAR focusing image is obtained, so the effectiveness and accuracy of the method are verified.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the field of signal processing, in particular to a spaceborne synthetic aperture radar (Synthetic Aperture Radar, SAR) imaging method based on Doppler cubic term estimation. Background technique

[0002] Spaceborne SAR is an advanced space-based information acquisition payload, and an important means of obtaining control information rights. It can overcome the limitations of cloud, fog, rain, snow and dark night conditions to image ground targets, and can realize all-day, All-weather, high-resolution, large-scale surface-to-earth observation has a wide range of applications in ocean observation, precision agriculture, environmental protection, disaster monitoring, resource exploration, geological surveying and mapping, government public decision-making, etc., and plays an irreplaceable role in other space remote sensing methods. effect. It has been 60 years since the concept of synthetic aperture was proposed. During this peri...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More