KEYWORDS: Radar, Signal detection, Antennas, Computer simulations, Data modeling, Signal processing, Target detection, Analog electronics, Distance measurement, Spectral resolution
This paper describes a study of the operation of a long range CWFM radar using "System
View" software for modeling and simulation. The System View software is currently offered by
Agilent. The models that were studied include: a model illustrating the basic principle of operation
of the CWFM radar, the range resolution of the radar, the effect of long range processing and the
resultant approach with the tradeoff of detected range resolution due to Doppler frequency shift as a
function of range distance. The study was performed as part of the design of an airborne CWFM
radar. The radar can be designed with a single antenna or a dual antenna. The dual antenna
approach is presented in this paper.
This paper describes a study of the operation of CWFM radar using "System View" software for
modeling and simulation. The System View software is currently offered by Agilent; a link to the
website is given in the footnote. The models that were studied include: a model illustrating the basic
principle of operation of the CWFM radar, the range resolution of the radar, the effect of nonlinear
distortions on the detected signals, and the effect of interference and jamming on the reception of
CWFM signals. The study was performed as part of the design of an airborne CWFM radar.
KEYWORDS: Radar, Antennas, Optical correlators, L band, Modulators, Image processing, Signal processing, Ground penetrating radar, Synthetic aperture radar, Process control
The FOPEN radar was designed and fabricated in response to the need to detect items buried below the surface using a
rapid detection method from an airborne platform. The system uses Synthetic Aperture Radar Processing in the form of
ratcheting spot light SAR. The image of the ground at a slant range of 40 degrees on either the right or left side of the
aircraft and gives a two dimensional image of the ground. The antenna can also point in a nadir position to sound the
ground. The radar was developed to image 1 sq mile with each frame with a resolution of 1 meter in the slant range.
This requires the use of the entire L-Band radar spectrum of 150 Meg Hz. In order to detect images below the ground
additional processing must be performed on the raw data, accordingly the raw data is recorded at a data rate of 200
Mbyte/second. The data is recorded as both I and Q data. The radar has on board processing but only for verifying that
the system is operating. Not all adjacent frames are processed for this reason. The processing and analysis is performed
on the ground by a system that has multiple work stations and software to process the image of the surface and the sub
surface. By further processing the data the surface can be removed and the lower level glint points can be seen and
enhanced using signal processing techniques.
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