Synchronous Orbit Radar Imaging Method Based on Range Migration Fine-tuning and Subband Segmentation

A technology of geosynchronous orbit and distance migration, which is applied in the field of geosynchronous orbit synthetic aperture radar GEO-SAR data processing, geosynchronous orbit synthetic aperture radar imaging, and geosynchronous orbit radar imaging based on range migration fine-tuning and sub-band segmentation, which can solve the problem of synchronous orbit Synthetic Aperture Radar Research Lag and Other Issues

CN104133215BActive Publication Date: 2017-04-12XIDIAN UNIV
2 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2017-04-12

Smart Images

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

Abstract

The invention discloses a synchronous orbit radar imaging method based on range migration fine adjustment and sub-band division, and relates to the radar signal processing field. The method comprises the following steps: step 1, the synchronous orbit SAR (Synthetic Aperture Radar) receives echo signals of a target; step 2, the instantaneous distance is expanded in the vicinity series of zero Doppler time tc, and the coefficient kn of the n term after series expansion is obtained; step 3, a fine adjustment correction function is used for carrying out range migration fine adjustment on the echo signals; step 4, signals through phase error compensation are obtained; step 5, phase azimuth space variant features are eliminated on the signals through the phase error compensation, azimuth pulse pressure, sub-band division, phase error compensation and sub-band synthesis are carried out to obtain a complex image; and step 6, the complex image is corrected to obtain the imaging result. The synchronous orbit radar imaging method based on range migration fine adjustment and sub-band division can effectively solve the problem of two-dimensional space variant features of the synchronous orbit SAR GEO-SAR signals, and can be applied to synchronous orbit SAR GEO-SAR data processing.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the field of radar signal processing, and relates to geosynchronous orbit synthetic aperture radar imaging (Geosynchronous Synthetic Aperture Radar, GEO-SAR), in particular to a geosynchronous orbit radar imaging method based on range migration fine-tuning and sub-band segmentation, which is applied to geosynchronous orbit synthetic aperture Radar GEO-SAR data processing. Background technique

[0002] Synthetic Aperture Radar (SAR) has the advantages of all-weather, all-weather, high resolution, long range, mapping bandwidth and strong anti-interference. Under complex combat conditions, synthetic aperture radar SAR can complete tasks that conventional surveillance systems (optical, infrared imaging, etc.) , detection, tracking, identification and precision strike capabilities. In civil affairs, synthetic aperture radar SAR can be used in soil resource monitoring, ecological management, urban planning, and marine information e...

Examples

Embodiment Construction

[0087] refer to figure 2 , the synchronous orbit radar imaging method based on range migration fine-tuning and sub-band segmentation of the present invention is illustrated, and the present invention is applied to synchronous orbit synthetic aperture radar GEO-SAR data processing, and its steps include the following contents.

[0088] Step 1. Synchronous Orbit Synthetic Aperture Radar SAR includes a radar transmitter and a radar receiver. The radar transmitter transmits signals, and the radar receiver receives target echo signals.

[0089] In the present invention, the distance from the target to the radar transmitter and the distance from the target to the radar receiver are set to be far greater than the distance between the transmitter and the receiver.

[0090] Step 2, set the distance between the position and the target when the radar transmitter transmits the signal as R T (t a), the distance between the position and the target when the radar receiver receives the sig...