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Phase calibration of a stepped-chirp signal for a synthetic aperture radar

A synthetic aperture radar, stepped technology, applied in the field of radar systems, can solve the problem of not describing the correction of stepped chirp SAR errors, etc.

Active Publication Date: 2016-05-04
THE BOEING CO
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  • Abstract
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Problems solved by technology

Unfortunately, this reference limits its disclosure to single-step SARs and does not describe any method of correcting errors in step-chirp SARs

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  • Phase calibration of a stepped-chirp signal for a synthetic aperture radar
  • Phase calibration of a stepped-chirp signal for a synthetic aperture radar
  • Phase calibration of a stepped-chirp signal for a synthetic aperture radar

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[0048] A radar calibration processor ("RCP") for calibrating the phase of a stepped chirp signal utilized by a synthetic aperture radar ("SAR") is disclosed. The RCP includes a periodic phase error ("PPE") calibrator, a first non-periodic phase error ("NPPE") calibrator in signal communication with the PPE calibrator, and a second NPPE calibrator in signal communication with the first NPPE calibrator.

[0049] In an example of operation, the RCP performs a method of calibrating a stepped chirp by receiving SAR image data from a scanned acquired radar target area using SAR with multiple stepped chirps and calibrating the phase of the stepped chirp The phase of the chirp signal. Phase calibration is performed by estimating the phase error in the stepped chirp signal. The RCP performs the method by sequentially first calibrating the SAR image data with a PPE calibrator to remove periodic phase errors in the SAR image data. The RCP then calibrates the PPE calibrated SAR image da...

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Abstract

A Radar Calibration Processor ("RCP") for calibrating the phase of a stepped-chirp signal utilized by a synthetic aperture radar ("SAR") is disclosed. The RCP includes a periodic phase error ("PPE") calibrator, first non-periodic phase error ("NPPE") calibrator in signal communication with the PPE calibrator, and a second NPPE calibrator in signal communication with the first NPPE calibrator.

Description

[0001] Cross References to Related Applications [0002] This disclosure claims priority to US Patent Application Serial No. 14 / 491,354, filed September 19, 2014, the entire contents of which are hereby incorporated by reference. technical field [0003] The present disclosure relates generally to radar systems and, more particularly, to correcting errors in Synthetic Aperture Radar ("SAR") data. Background technique [0004] Radar has long been used for military and non-military purposes in a variety of applications such as imaging, navigation, remote sensing, and global positioning. A synthetic aperture radar ("SAR") is a primary coherent aerial or satellite side-viewing radar system ("SLAR") that utilizes the flight path of a mobile platform (i.e., a vehicle such as an aircraft or satellite) on which the SAR is located to detect Electronically simulate extremely large antennas or apertures and generate high-resolution remote sensing images. In particular, SAR is used fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/40
CPCG01S7/40G01S13/282G01S13/30G01S13/90G01S7/4004G01S13/9054
Inventor 光·M·乔
Owner THE BOEING CO
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