Multiple-transmission multiple-reception synthetic aperture radar signal processing method based on time-shift orthogonal wave forms

A synthetic aperture radar, multi-transmit and multi-receive technology, applied in radio wave reflection/re-radiation, radio wave measurement system, using re-radiation, etc., to achieve the effect of improving and azimuth resolution and improving performance

Inactive Publication Date: 2014-04-30
INST OF ELECTRONICS CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

It is very difficult to design such a waveform at present

Method used

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  • Multiple-transmission multiple-reception synthetic aperture radar signal processing method based on time-shift orthogonal wave forms
  • Multiple-transmission multiple-reception synthetic aperture radar signal processing method based on time-shift orthogonal wave forms
  • Multiple-transmission multiple-reception synthetic aperture radar signal processing method based on time-shift orthogonal wave forms

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Embodiment 1

[0069] In this embodiment, an X-band synthetic aperture radar system based on time-shifted orthogonal multiple-feed multiple-recovery synthetic aperture radar is designed. Parameter settings are shown in Table 1

[0070] Table 1 System parameters

[0071]

[0072] The transmission and reception scheme of the system in the azimuth direction is as follows: Figure 6 shown. The system transmits twice and receives three times in the azimuth direction to obtain 5 equivalent phase centers.

[0073] Firstly, the one-dimensional echo separation simulation is carried out, and the two types of echoes received from a certain target in the distance are superimposed together. After pulse compression and separation, the result is as follows Figure 7a-Figure 7f Shown is the one-dimensional echo separation result of embodiment 1, Figure 7a is the received echo; Figure 7b is the compression result; Figure 7c-Figure 7e for the separation result; Figure 7f for Figure 7c and F...

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Abstract

The invention provides a multiple-transmission multiple-reception synthetic aperture radar signal processing method based on time-shift orthogonal wave forms. The method comprises the following steps: a set of time-shift orthogonal wave forms are constructed and transmitted through different antenna, wherein the time-shift orthogonal wave forms can be transmitted at the same time, and frequency bands of the time-shift orthogonal wave forms overlap; based on DBF and zero orientation of the DBF, objectives from different transmission channels are received, the objectives which are mixed together are subjected to echo separation, and therefore separated echo signals are acquired; the separated echo signals are synthesized into an echo signal with multiple phase centers, so that the performance of a synthetic aperture radar system is improved. After the radar system acquires the multiple phase centers, the radar surveying and mapping bandwidth and the azimuth resolution ratio can be increased, and the performance of interference and moving target detection is improved.

Description

technical field [0001] The invention relates to a synthetic aperture radar multiple transmission and multiple reception technology, in particular to a multiple transmission and multiple reception synthetic aperture radar signal processing method based on a time-shifted orthogonal waveform. Background technique [0002] Synthetic aperture radar is an all-weather and all-weather observation system, so it has a very important position in the field of remote sensing. However, with the improvement of application requirements on the performance of synthetic aperture radar, the conventional synthetic aperture radar system has gradually been unable to meet the observation requirements of current applications, so new working modes and synthetic aperture radar systems are sought to overcome the conventional synthetic aperture radar performance. The deficiency of the synthetic aperture radar has become the main development direction of the current synthetic aperture radar. In recent y...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/02G01S13/90
CPCG01S7/2925G01S7/42G01S13/9023G01S13/9029G01S13/9076
Inventor 王伟王宇邓云凯郭磊徐伟侯丽丽
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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