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Method for computing range ambiguity of satellite-borne synthetic aperture radar (SAR) in universal mode

A calculation method and distance-oriented technology, applied in the field of signal processing, can solve problems such as few studies

Inactive Publication Date: 2012-10-17
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the traditional range ambiguity calculation method is mainly aimed at the side-view situation, but there are few researches on the range ambiguity calculation under the large scanning angle

Method used

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  • Method for computing range ambiguity of satellite-borne synthetic aperture radar (SAR) in universal mode
  • Method for computing range ambiguity of satellite-borne synthetic aperture radar (SAR) in universal mode
  • Method for computing range ambiguity of satellite-borne synthetic aperture radar (SAR) in universal mode

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Embodiment

[0165] This embodiment provides a method for calculating the range ambiguity in the general spaceborne SAR mode, which includes the following steps and a flow chart, such as figure 2 Shown:

[0166] Step 1: Read in the relevant parameters of the spaceborne SAR system, including: orbital height H, distance antenna width L r , radar operating wavelength λ, mean earth radius R e , the speed of light c, the pulse repetition frequency PRF, the angle of view of the antenna center θ m , the starting scan angle end scan angle middle scan angle The width of the range mapping swath SW_r, the number of selected positions Fr in the range direction;

[0167] Wherein, in the present embodiment, specific parameters are: H=800km, L r = 2m, λ = 0.03m, R e =6371140m, c=3×10 8 m / s, PRF=2000Hz, θ m = 30°, SW_r=15000m, Fr=1001;

[0168] Step 2: Obtain the distance parameters in the squint state, the flow chart is as follows image 3 shown;

[0169] A. Establish a coordinate sys...

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Abstract

The invention provides a method for computing the range ambiguity of a satellite-borne synthetic aperture radar (SAR) in a universal mode and belongs to the field of signal processing. The method comprises the following steps of: reading relevant parameters of a satellite-borne SAR system; acquiring range parameters in a skew state; widening a range antenna; acquiring the number of fuzzy areas; acquiring the energy of the fuzzy areas; computing the range ambiguity of a j-th position; and drawing change curves of the range ambiguity along range positions. The method has the advantages that during acquisition of skew distance between a range antenna pattern and a satellite platform as well as a target point, an earth sphere model is employed, the situation is approximate to actual situation, and a result is accurate and reliable; during acquisition of the range ambiguity, the space geometric characteristic under the condition of large scanning angle is taken into full consideration, andthe result is high in reliability; and for different designs of scanning angles in system design, different change curves of the range ambiguity can be obtained, and different scanning angles can be compared and optimized by analyzing the different change curves.

Description

technical field [0001] The invention belongs to the field of signal processing, and in particular relates to a method for calculating the range ambiguity of a spaceborne SAR in a general mode. Background technique [0002] Synthetic Aperture Radar (SAR) satellites have developed rapidly in recent years. Since SAR satellites are not limited by factors such as weather, geography, and time, they can observe the earth all day long and have certain penetrating power. Therefore, it is widely used in military reconnaissance, topographic mapping, resource detection, ocean observation, ecological monitoring, natural disaster monitoring, rapid rescue, etc. [0003] The range ambiguity is an important indicator in spaceborne SAR, which directly reflects the interference degree of the range sidelobe signal to the main lobe signal. In the system design and wave position selection, the range ambiguity is one of the main assessment indicators . Synthetic aperture radar adopts the pulse w...

Claims

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Application Information

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IPC IPC(8): G01S7/40
Inventor 王鹏波门志荣陈杰刘月珊杨威
Owner BEIHANG UNIV
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