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Proceedings of the 1997 IEEE National Radar Conference

13-15 May 1997

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  • Proceedings Of The 1997 IEEE National Radar Conference, May 13-15,1997, Syracuse, New York [front matter]

    Publication Year: 1997, Page(s):i - xvii
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    Freely Available from IEEE
  • An ultra-low sidelobe pulse compression technique for high performance radar systems

    Publication Year: 1997, Page(s):111 - 114
    Cited by:  Papers (6)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    A pulse compression technique based on deconvolution and linear prediction in the frequency domain is presented which offers approximately 20 dB improvement in time sidelobe performance compared to conventional matched filter and windowing techniques. The detection performance converges to that of a matched filter for weak signals, while the sidelobe level decreases to very low levels as a functio... View full abstract»

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  • Prevention of signal cancellation in an adaptive nulling problem

    Publication Year: 1997, Page(s):191 - 195
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (269 KB)

    Signal cancellation is a serious problem in adaptive nulling. The problem arises when the actual direction of arrival of the signal is slightly off the assumed direction of arrival. The adaptive algorithms consider the actual signal a jammer as the direction of arrival is not exactly specified. It is shown how to prevent signal cancellation when the direction of arrival is not known exactly. Multi... View full abstract»

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  • Proceedings of the 1997 IEEE National Radar Conference

    Publication Year: 1997
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    Freely Available from IEEE
  • A direct matrix approach to the adaptive nulling problem with multiple look directions utilizing the conjugant gradient method

    Publication Year: 1997, Page(s):284 - 288
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (278 KB)

    In adaptive nulling problems, signal cancellation can occur if the direction of arrival (DOA) of the signal of interest (SOI) is unknown and the desired look direction is slightly off the actual DOA. In this case, the signal is considered a jammer and nulled by the adaptive algorithms. Target returns from within a finite extent indicate the presence of a target. This paper investigates the additio... View full abstract»

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  • Accounting for the effects of mutual coupling in adaptive antennas

    Publication Year: 1997, Page(s):361 - 366
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (529 KB)

    This paper presents a method to account for the effects of mutual coupling in least squared error adaptive algorithms. The mutual coupling is quantized using the method of moments. The method of moments admittance matrix is used to compensate for the mutual coupling. View full abstract»

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  • Conference Author Index

    Publication Year: 1997, Page(s): 379
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    Freely Available from IEEE
  • Optimal target identification based upon ultra high resolution radar profiles

    Publication Year: 1997, Page(s):278 - 283
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    A new methodology for identifying aircraft using high range resolution radar is developed. The identifier maximizes the probability of target identification in dependent complex Gaussian noise, without being forced to decide from a limited number of categories. The results from experiments using ultra high range resolution (HRR) data demonstrates the fact that the proposed identifier provides a re... View full abstract»

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  • Radar target recognition by fuzzy logic

    Publication Year: 1997, Page(s):257 - 262
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    The objective of this paper is to present a method of target recognition based on the fuzzy logic principles applied to conventional and multifunction radars. After a presentation of the parameters which can be delivered by signal and data processing, the paper gives a description of an algorithm including both spatial and temporal merging. Computation of the basic functions (“membership fun... View full abstract»

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  • Over-the-horizon radar surveillance of airfields for counterdrug applications

    Publication Year: 1997, Page(s):178 - 181
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    Airfield surveillance utilizing over-the-horizon radar (OTHR) offers the opportunity to gather significant intelligence concerning activity levels at suspect drug smuggling airports. It also provides the potential to classify aircraft initially from observed takeoff data, which would be helpful in interdiction efforts. This paper discusses the radar signal components and signal processing techniqu... View full abstract»

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  • Real-time STAP demonstration on an embedded high performance computer

    Publication Year: 1997, Page(s):54 - 59
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (636 KB)

    Real-time signal processing for a 16 channel phased array radar, including space-time adaptive processing (STAP) algorithms, has been implemented using a 29 node ruggedized version of an Intel Paragon. Techniques employed to efficiently implement each step of the signal processing are discussed. An overall throughput of 3.15 GFLOPS and processing efficiency of 48% has been achieved, indicating tha... View full abstract»

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  • Over-the-horizon radar sensitivity enhancement by impulsive noise excision

    Publication Year: 1997, Page(s):252 - 256
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    This paper describes a signal processing algorithm that increases radar sensitivity by as much as 20 dB, after excising noise impulses, such as those caused by lightning, from the temporal data stream at the receiver output. The work was performed at the California-based Wide Aperture Research Facility (WARF) high-frequency (HF) over-the-horizon radar (OTHR) for enhancement of the U.S. Navy reloca... View full abstract»

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  • On the influence of coordinate transform upon measurement error of distributed system

    Publication Year: 1997, Page(s):272 - 277
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    Coordinate transformations are always of concern in the data processing of distributed systems such as radar, ECCM, and satellite location. The influence of coordinate transformations upon the measurement errors of the distributed sensor system is discussed. Detail derivations of the relation equation between the original coordinate system and the transformed new one, quantitative analysis of the ... View full abstract»

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  • A study on 94 GHz band millimeter-wave RCS characteristics: numerical comparison with 35 GHz

    Publication Year: 1997, Page(s):172 - 177
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    This paper presents numerical results of 94 GHz radar cross section (RCS) characteristics for the purpose of signal-to-clutter ratio (S/C) enhancement feasibility study. Our analysis method is an electromagnetic field integral equation based on physical optics and a random rough surface with perfect conductivity is postulated as the scatterer. It is found that the RCS at 94 GHz is independent of t... View full abstract»

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  • Covariance matrix estimator performance in non-Gaussian clutter processes

    Publication Year: 1997, Page(s):309 - 313
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    This paper considers the sample covariance matrix estimator in spatially non-Gaussian airborne radar clutter modelled as a spherically invariant random process (SIRP). Analytic expressions are derived for the estimator variance. They reveal the variance increase for non-Gaussian clutter as well as the sample support size required to reduce the variance to that of the Gaussian case. Specific consid... View full abstract»

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  • Wind detection in a microcosm: ship/aircraft environment sensors

    Publication Year: 1997, Page(s):246 - 251
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    One of the most demanding aspects of a Navy helicopter pilot's job is landing his aircraft on the flight deck of a pitching, rolling, heaving and yawing ship. The complex airwake velocity field associated with the ship and aircraft interface directly affects the pilot's ability to control the aircraft during takeoff, approach, hover, landing, and deck operations. Dynamic interface (DI) testing is ... View full abstract»

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  • Robust classification of targets in POL-SAR using wavelet packets

    Publication Year: 1997, Page(s):105 - 110
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    Some polarimetric SAR (POL-SAR) platforms have indicated the promise of producing imagery of a scene acquired at several frequencies, incidence angles, polarizations, and at multiple time intervals. Such large amounts of data necessitate the construction of robust algorithms that can process a wide range of data with minimal retraining and supervision while minimizing the complexity of the algorit... View full abstract»

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  • Performance of distributed CFAR tests in nonhomogeneous background

    Publication Year: 1997, Page(s):36 - 41
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    We evaluate the performance of several distributed CFAR tests operating in nonhomogeneous background conditions. The analysis considers the detection of Rayleigh target in Rayleigh clutter with the possibility of differing clutter power levels in the test cells of distributed radars. The tests considered include the previously defined maximum order statistic detector (MOS), belonging to a class of... View full abstract»

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  • Variance bounds for parameter estimation in correlated non-Gaussian clutter

    Publication Year: 1997, Page(s):25 - 30
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    We derive a lower bound on the error covariance matrix for any unbiased estimator of the parameters of a disturbance modeled as a mixture of spherically invariant random processes (SIRPs). The bound can be numerically computed in closed form in many practical cases where the computation of the true Cramer-Rao lower bound is infeasible. The proposed bound is particularly useful when the disturbance... View full abstract»

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  • High fidelity propagation modelling in real time

    Publication Year: 1997, Page(s):166 - 171
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The growing threat of low-flying cruise missiles, and the increased importance of littoral operations, have made real-time high fidelity radar propagation modeling essential to the Navy. Traditional propagation models used within the Navy community are valid only for standard atmosphere and homogeneous sea environments. Newly available propagation models-such as the parabolic equation based variet... View full abstract»

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  • Target detection in unfocused SAR/ISAR images: A geometric approach

    Publication Year: 1997, Page(s):295 - 299
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    In synthetic aperture radar (SAR) and inverse synthetic aperture radar (ISAR), targets with uncompensated motion are blurred in the range-Doppler radar image. Our goal with this paper is twofold: (1) to analyze the image formation process in SAR/ISAR and develop a model for the distortion introduced by inadequate motion compensation; (2) to design a detection scheme that is robust to the smearing ... View full abstract»

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  • To increase the accuracy of the range alignment in ISAR imaging by super-resolution technique

    Publication Year: 1997, Page(s):269 - 271
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    Envelope drift and jump error caused by using the envelope amplitude correlation method pulse by pulse may be as large as the length of several range bins. These errors decrease the quality of the image heavily. By using the super-resolution technique, the accuracy of the range alignment is increased, and the envelope drift error and jump error in the range alignment are decreased. Imaging results... View full abstract»

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  • Improved over-the-horizon radar accuracy for the counter drug mission using coordinate registration enhancements

    Publication Year: 1997, Page(s):132 - 137
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    For the relocatable over the horizon radar (ROTHR) counter-drug radar system accurate knowledge of target position is an important part of the detection and interdiction of drug smuggling aircraft. An improvement in the radar's target track positional accuracy has been obtained by using external reference sources at known locations in the radar coverage area. Tracks formed on these reference sourc... View full abstract»

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  • Zpatch. A high frequency bistatic signature prediction code

    Publication Year: 1997, Page(s):232 - 236
    Cited by:  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    This paper describes a high frequency bistatic radar cross section (RCS) prediction computer code called “Zpatch” which is based on the high frequency technique of shooting and bouncing rays. A modern computer graphics technique called “z-buffering” is used for rapid solution of the line-of-sight hidden surface problem. Zpatch is capable of generating monostatic and bistati... View full abstract»

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  • Performance analysis of reduced-rank STAP

    Publication Year: 1997, Page(s):42 - 47
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    The space-time radar problem is well suited to the application of techniques that take advantage of the low-rank property of the space-time covariance matrix. In particular, it was shown that when the space-time covariance matrix is estimated from a dataset with limited support, reduced-rank methods outperform full-rank space-time adaptive processing (STAP). We study the application of several red... View full abstract»

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