Waveform Synthesizer For Imaging And Ranging Applications
Abstract
Frequency dependent corrections are provided for Local Oscillator (LO) feed-through. An operational procedure filters 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 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 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:
-
- Cedar Crest, NM
- Albuquerque, NM
- Issue Date:
- Research Org.:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- OSTI Identifier:
- 880031
- Patent Number(s):
- 6836240
- Application Number:
- 10/437329
- Assignee:
- Sandia Corporation (Albuquerque, MN)
- 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
Citation Formats
Dubbert, Dale F, Dudley, Peter A, Doerry, Armin W, and Tise, Bertice L. Waveform Synthesizer For Imaging And Ranging Applications. United States: N. p., 2004.
Web.
Dubbert, Dale F, Dudley, Peter A, Doerry, Armin W, & Tise, Bertice L. Waveform Synthesizer For Imaging And Ranging Applications. United States.
Dubbert, Dale F, Dudley, Peter A, Doerry, Armin W, and Tise, Bertice L. Tue .
"Waveform Synthesizer For Imaging And Ranging Applications". United States. https://www.osti.gov/servlets/purl/880031.
@article{osti_880031,
title = {Waveform Synthesizer For Imaging And Ranging Applications},
author = {Dubbert, Dale F and Dudley, Peter A and Doerry, Armin W and Tise, Bertice L},
abstractNote = {Frequency dependent corrections are provided for Local Oscillator (LO) feed-through. An operational procedure filters 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 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 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 = {2004},
month = {12}
}