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Author: Mark E. Davis
Publisher: IET
Published: 2011-06-30
Total Pages: 370
ISBN-13: 1891121006
DOWNLOAD EBOOKThis book covers all aspects of foliage penetration (FOPEN) radar for both airborne military systems and earth resource mapping. It is the first book to be published on the subject.
Author:
Publisher:
Published: 1974
Total Pages: 58
ISBN-13:
DOWNLOAD EBOOKThe report describes the implementation, procedure, and results of the Multipurpose Foliage Penetration Radar (M-FOPEN) conducted by the 25th Infantry Division. Maximum ranges of detection were determined for the M-FOPEN operating in various types of terrain and foliage, and probability of detection calculated for each range, target, and foliage combination. These tests demonstrated the capability of the M-FOPEN to penetrate up to 700 meters of foliage and detect moving targets, with a negligible false alarm rate. A tactical exercise was conducted during which the M-FOPEN and the standard AN/ PPS-5 Ground Surveillance Radars were deployed and the detection performance and false alarm rates of each compared. Detection experiments were performed with the M-FOPEN using a helicopter (AH-1G) as the target to determine the doppler signature of the aircraft. These demonstrated that a unique doppler signature does exist for helicopters and the helicopters are detectable using the M-FOPEN even though the path between the radar and the aircraft is blocked by foliage.
Author:
Publisher:
Published: 1974
Total Pages: 156
ISBN-13:
DOWNLOAD EBOOKThe report documents the USA Land Warfare Laboratory's Foliage Penetration Radar program including the historical aspects, the technology developed and four resulting systems that saw combat in Southeast Asia. Application of the FOPEN technology to intrusion detection systems, airborne FOPEN radars, swimmer detection systems, and a radar capable of detecting low flying aircraft concealed by foliage are presented. A review of signal processing techniques and tradeoffs for ground surveillance radars and a summary of propagation research concludes the report.
Author:
Publisher:
Published: 1974
Total Pages: 61
ISBN-13:
DOWNLOAD EBOOKThe report describes detection experiments performed with the Foliage Penetration (FOPEN) Radar operating at 140 MHz in which the target was a helicopter flying nap-of-the-earth (NOE). Preliminary experiments performed in Hawaii during the user evaluation of the FOPEN system demonstrated the ability of this radar to detect helicopters flying NOE using foliage and terrain for cover. A series of experiments at Aberdeen Proving Ground were made to establish the detection ranges through foliage for a single UH-1 helicopter. Additional measurements of the radar cross section of the UH-1 on the ground were taken using the LWL Airborne Foliage Penetration Radar, and are also reported. The report concludes with a theoretical analysis of the propagation losses affecting the detection of aircraft flying NOE by radars operating at frequencies of from 100 to 10,000 MHz.
Author: Joseph A. Henning
Publisher:
Published: 2001
Total Pages: 166
ISBN-13:
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Published: 1976
Total Pages: 27
ISBN-13:
DOWNLOAD EBOOKAn antenna has been designed for the Combined Surveillance and Foliage Penetration Radar (COMSFOR) project. The antenna provides an existing X- band surveillance radar with a moderate foliage penetration capability. The foliage penetration antenna is an array of L-band, stripline dipole/director elements placed in front of an X-band aperture. A description of the dual- frequency antenna is given along with the measured RF performance at both frequency bands. A separate L-band corner reflector antenna design which can be mounted on a lightweight telescoping mast is also described. The antenna has demonstrated excellent gain and pattern characteristics for its size.
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Publisher:
Published: 1975
Total Pages: 73
ISBN-13:
DOWNLOAD EBOOKA series of radar measurements on the penetration of foliage has been made at 9.4, 16.2, 35, and 95 GHz. Measurements were made for both the one-way and two-way cases at 9.4 and 16.4 GHz at similar foliage areas for comparison. Most of the measurements were made at depression angles below 3 degrees, although a set of one-way measurements was made at 9.4 and 16.2 GHz for a depression angle of 29 degrees. Attenuation properties, polarization ratios, and noncoherent spectral correlation properties were investigated as a function of frequency, polarization, depth of foliage and wind speed. Limited comparisons are made with data previously available at lower frequencies.
Author: Timothy R. Miller
Publisher:
Published: 1994
Total Pages: 112
ISBN-13:
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Publisher:
Published: 1999
Total Pages: 4
ISBN-13:
DOWNLOAD EBOOKThis project has involved both numerical simulation of electromagnetic scattering and the associated signal processing for ultra-widenband synthetic aperture radar (SAR) for foliage and ground penetrating radar (FOPEN and GPEN, respectively). With regard to the modeling, we have developed a fast multipole method (FMM) model for electromagnetic scattering from electrically large conducting targets in the presence of a half space, with application to scattering from surface/subsurface unexploded ordnance (UXO), as well as for scattering from surface vehicles, such as tanks. The FMM simulator is significantly faster than conventional method of moments (MoM) solvers. allowing solution of problems that were heretofore intractable. The code has been delivered to the Army Research Laboratory (ARL), and successfully compared with data measured by ARL. In addition to this modeling, we have developed hidden Markov model (HMM) automatic target recognition algorithms, applicable to the SAR detection and discrimination of concealed targets. Within the context of the HMM, we have employed a physics based matching pursuits feature parser. This signal processing paradigm has been successfully applied to ARL measured FOPEN and GPEN data.
Author: Hans Hellsten
Publisher: Artech House
Published: 2017-05-31
Total Pages: 367
ISBN-13: 1630814466
DOWNLOAD EBOOKThis unique resource presents the principles of meter wave ground imaging radar focusing on foliage penetration. Scattering of VHF/UHF radar signals are presented including the basic laws of electromagnetism, homogeneous media, media discontinuities/non-flat media discontinuities, and ground reflectivity. The book introduces meter wavelength synthetic aperture radar, bandwidth, and SAR imaging principles, including moving objects and also compares collected SAR data. Meter wavelength SAR system design and processing is explored, highlighting low frequency SAR design aspects, characterization of additive noise, antenna system basics, waveforms and emission adaptation which is critical material to the advancement in sensors and signal processing for below ground imaging by the energy industry and governments worldwide. The FFBP method of processing, explicit treatment of base 2 FFBP is explained along with motion errors sensitivity and motion estimation methods. The book also explains the Bayesian change detection, covariance moving target extraction and polarimetric subsurface imaging.
