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Active externally coefficient potentiometer and scaling method of wideband synthetic aperture radar

A synthetic aperture radar and external calibration technology, applied in the field of radar detection, can solve the problems of low radar cross-sectional area, scene clutter cover, difficult high-resolution synthetic aperture radar external calibration test, etc., and achieve the effect of improving accuracy

Inactive Publication Date: 2007-12-05
INST OF ELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

Under such constraints, with the improvement of resolution, the radar cross section (RCS) of traditional passive corner reflectors is very low, which is easily covered by scene clutter, and it is difficult to apply to high-resolution synthetic aperture radar. external calibration test

Method used

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  • Active externally coefficient potentiometer and scaling method of wideband synthetic aperture radar
  • Active externally coefficient potentiometer and scaling method of wideband synthetic aperture radar
  • Active externally coefficient potentiometer and scaling method of wideband synthetic aperture radar

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Embodiment Construction

[0026] 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 considered for the purpose of illustration and not limitation of the present invention.

[0027] According to the present invention, the active external scaler system structural block diagram of wideband synthetic aperture radar shown in Fig. 1, Fig. 2 is the active external scaler system structural diagram of wideband synthetic aperture radar of the present invention, comprises in the figure:

[0028] Receiving antenna 1, modulation module 2, radio frequency module 3 and transmitting antenna 4; the radio frequency module is respectively connected to the output of the receiving antenna and the input of the transmitting antenna, and the other input of the radio frequency module is connected to the output of the modulation module; the receiving antenna 1 receives the synthetic aperture radar signal , and th...

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Abstract

The invention discloses an external scaler and calibrating method of new broad-band synthetic aperture radar, which is characterized by the following: modulating the signal of the received synthetic aperture radar through sine amplitude; making two sides of the Doppler signal of synthetic aperture radar of scaler generate symmetrical mirror-image spectrum; utilizing positional filter to extract the mirror-image spectrum; separating the synthetic aperture radar signal from ground clutter. The scaler contains receiving and transmitting antenna, RF mode and modulating mode. The invention realizes external scaling signal separated from ground clutter completely to form loop testing circuit with radar transceiver system, antenna, transmitting path and external scaler without influencing by ground clutter, which improves the precision of external scaler greatly under complex and high-ground clutter condition.

Description

technical field [0001] The invention belongs to the technical field of radar detection, and in particular relates to a new external scaler for wideband synthetic aperture radar. Background technique [0002] Synthetic Aperture Radar (SAR) adopts the principle of synthetic aperture to improve the azimuth resolution, while the improvement of range resolution relies on pulse compression technology, because SAR can image the ground all day and all weather, and has a certain ability to penetrate vegetation. Therefore, it is widely used in military, ocean, agriculture, forestry, resources, disaster monitoring, topographic mapping and other fields, and is especially valued by countries all over the world. At present, resolution, as one of the core technical indicators of synthetic aperture radar, has been improved from the initial hundred-meter level to sub-meter level. For example, PAMIR in Germany has reached 0.1 meter. As the main means to test the imaging resolution of synthet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
Inventor 乔明梁兴东丁赤飚张培杰韩冰
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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