NDLI: Optimal signal processing of frequency-stepped cw radar data

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Optimal signal processing of frequency-stepped cw radar data

Content Provider	NASA Technical Reports Server (NTRS)
Author	Ardalan, Sasan H. Neece, Robert T. Wu, Shawkang M. Bilbro, Griff L. Ybarra, Gary A. Hearn, Chase P.
Copyright Year	1995
Description	An optimal signal processing algorithm is derived for estimating the time delay and amplitude of each scatterer reflection using a frequency-stepped CW system. The channel is assumed to be composed of abrupt changes in the reflection coefficient profile. The optimization technique is intended to maximize the target range resolution achievable from any set of frequency-stepped CW radar measurements made in such an environment. The algorithm is composed of an iterative two-step procedure. First, the amplitudes of the echoes are optimized by solving an overdetermined least squares set of equations. Then, a nonlinear objective function is scanned in an organized fashion to find its global minimum. The result is a set of echo strengths and time delay estimates. Although this paper addresses the specific problem of resolving the time delay between the first two echoes, the derivation is general in the number of echoes. Performance of the optimization approach is illustrated using measured data obtained from an HP-X510 network analyzer. It is demonstrated that the optimization approach offers a significant resolution enhancement over the standard processing approach that employs an IFFT. Degradation in the performance of the algorithm due to suboptimal model order selection and the effects of additive white Gaussion noise are addressed.
File Size	1069062
Page Count	12
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19970003425
Archival Resource Key	ark:/13960/t38101c37
Language	English
Publisher Date	1995-01-01
Access Restriction	Open
Subject Keyword	Communications And Radar Impulses Radar Data Continuous Wave Radar Time Lag Radar Measurement Algorithms Least Squares Method Network Analysis White Noise Signal Processing Frequency Response Channels Data Transmission Radar Echoes Linear Equations Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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