Waveform synthesis for imaging and ranging applications
Abstract
Frequency dependent corrections are provided for quadrature imbalance and Local Oscillator (LO) feed-through. An operational procedure filters imbalance and LO feed-through effects without prior calibration or equalization. Waveform generation can be adjusted/corrected in a synthetic aperture radar system (SAR), where a rolling phase shift is applied to the SAR's QDWS signal where it is demodulated in a receiver; unwanted energies, such as LO feed-through and/or imbalance energy, are separated from a desired signal in Doppler; the separated energy is filtered from the receiver leaving the desired signal; and the separated energy in the receiver is measured to determine the degree of imbalance that is represented by it. Calibration methods can also be implemented into synthesis. The degree of LO feed-through and imbalance can be used to determine calibration values that can then be provided as compensation for frequency dependent errors in components, such as the QDWS and SSB mixer, affecting quadrature signal quality.
- Inventors:
- Issue Date:
- Research Org.:
- Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1175167
- Patent Number(s):
- 6828933
- Application Number:
- 10/436,631
- Assignee:
- Sandia Corporation
- Patent Classifications (CPCs):
-
G - PHYSICS G01 - MEASURING G01S - RADIO DIRECTION-FINDING
- DOE Contract Number:
- AC04-94AL85000
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Citation Formats
Doerry, Armin W., Dudley, Peter A., Dubert, Dale F., and Tise, Bertice L. Waveform synthesis for imaging and ranging applications. United States: N. p., 2004.
Web.
Doerry, Armin W., Dudley, Peter A., Dubert, Dale F., & Tise, Bertice L. Waveform synthesis for imaging and ranging applications. United States.
Doerry, Armin W., Dudley, Peter A., Dubert, Dale F., and Tise, Bertice L. Tue .
"Waveform synthesis for imaging and ranging applications". United States. https://www.osti.gov/servlets/purl/1175167.
@article{osti_1175167,
title = {Waveform synthesis for imaging and ranging applications},
author = {Doerry, Armin W. and Dudley, Peter A. and Dubert, Dale F. and Tise, Bertice L.},
abstractNote = {Frequency dependent corrections are provided for quadrature imbalance and Local Oscillator (LO) feed-through. An operational procedure filters imbalance and LO feed-through effects without prior calibration or equalization. Waveform generation can be adjusted/corrected in a synthetic aperture radar system (SAR), where a rolling phase shift is applied to the SAR's QDWS signal where it is demodulated in a receiver; unwanted energies, such as LO feed-through and/or imbalance energy, are separated from a desired signal in Doppler; the separated energy is filtered from the receiver leaving the desired signal; and the separated energy in the receiver is measured to determine the degree of imbalance that is represented by it. Calibration methods can also be implemented into synthesis. The degree of LO feed-through and imbalance can be used to determine calibration values that can then be provided as compensation for frequency dependent errors in components, such as the QDWS and SSB mixer, affecting quadrature signal quality.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Dec 07 00:00:00 EST 2004},
month = {Tue Dec 07 00:00:00 EST 2004}
}