In this chapter some consideration on spacefrequency domain processing are made. Adaptive array processing for gps interference rejection. Research institute for highfrequency physics and radar techniques fhr. Short course on spacetime adaptive processing raviraj s. A subspace method for mimo radar spacetime adaptive. Subband array implementations for spacetime adaptive. Space time adaptive processing seminar report, ppt, pdf. First, a digital compensation method is applied to compensate for the aperture fill time of the broadband phased array in the rangefrequency. A subspace method for mimo radar spacetime adaptive processing chunyang chen and p. Due to the equivalence of frequency and direction as perceived by a narrowband array a broadband jammer appears to be spread in angle. Alsfe consists of 1 to k detection stages k stages in fig. Abstractspacetime adaptive processing stap is a technique for processing signals from multiple antenna elements over multiple time periods for target detection.
Reconfigurable computing for spacetime adaptive processing. Spacetime adaptive processing stap some performance. Spacerange adaptive processing for rangecoupled radar imaging. Space time adaptive processing stap methods are appropriate in airborne radar where, due to the platform motion, detection of target signals against a strong clutter background can be a significant problem. Spacetimewaveform adaptive processing for frequency. You can use stap processing to detect slowmoving or stationary targets in background clutter. Space frequency adaptive processing sfap for radio frequency interference mitigation in spread spectrum receivers article in ieee transactions on antennas and propagation 526. West department of computer science box 43104 texas tech university lubbock, tx 794093104 usa tel. As stap algorithms are typical run on airborne platforms, they need to be both high performance and energyef. Traditionally, adaptive processing has focused on the space and time dimensions leading to spacetime adaptive processing stap. The robust spacefrequency adaptive processing sfap, combining array signal processing theory, adaptive filtering algorithm and fast fourier transform fft, based on segmentation of the. The performance of narrowband sfap is studied when the time domain samples are multiplied by a window function. The topic of multielement steered beam and adaptive antenna arrays has received attention within the gps.
Augmenting synthetic aperture radar with space time. The list of acronyms and abbreviations related to sfap spacefrequency adaptive processing. Pdf adaptive spacefrequency processing for distributed. T, is available at the beamformer input for processing, where x mn is the nth signal sample at the mth antenna. We identify the signal components comprising the transmitted and received waveforms and organize it in a spacetime data vector. Spacetimefrequency adaptive processor for multiple interference. Also explore the seminar topics paper on space time adaptive processing with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year electronics and telecommunication engineering or ece students for the year 2015 2016. A spacetime adaptive processing stap algorithm which can reject interference in. The system can use signal processing techniques such as spacefrequency adaptive processing using ffts for instance, to filter jamming or other interference signals from. Spacetime adaptive processing stap refers to the simultaneous processing of the signals from an array antenna during a multiple pulse coherent waveform. In view of the above problems, this paper proposes a spacetimefrequency adaptive processor stfap by combining tf analysis and spatial processing.
In this thesis, we investigate the computational complexity, realization requirements and detection performance of spacetime adaptive processing stap for radar surveillance radar system. An efficient broadband adaptive beamforming algorithm. When we discuss radars we normally consider the processes of beam forming, matched filtering and doppler processing separately. Introduction spacetime adaptive processing stap refers to a class of. The design is based on a method for improved ssf representation of. Military application of spacetime adaptive processing dtic. Spacefrequency adaptive processing sfap for rfi mitigation in spread spectrum receivers abstract. An increase in sinr serves to separate the pdfs for null and hypothesis. Department of electrical and computer engineering university of toronto by oliver saleh 2008 abstract highfrequency surface wave radarhfswr is a radar technology that o. In this paper, a smart antenna processing for rfid systems is implemented. The spatial steering vector is related to the look direction while the temporal steering vector. Under the assumption of existence of sufficient independent and identically distributed iid training data, stap has excellent performance in suppressing the spacetime coupled. Spacetime adaptive processing stap has been shown to be an effective technique for interference cancellation and target detection in airborne monostatic radar.
Spacetime adaptive processing is a natural evolution of radar signal process time only processing single channel mti processing pulse doppler processing space only processing multiple channel jammer cancellation spacetime processing nonadaptive displaced phase center array dpca processing simultaneous dpca. Stap techniques filter the signal in both the angular and doppler domains thus, the name spacetime adaptive processing to suppress the clutter and jammer returns. Spacetime adaptive processing for airborne surveillance. Space frequency adaptive processing sfap for radio. Krolik, mimo radar spacetime adaptive processing for multipath clutter mitigation, in fourth ieee workshop on sensor array and multichannel processing, 2006, pp. In the following sections, we simulate returns from target, clutter, and jammer and illustrate how stap techniques filter the interference from the received signal.
Firstly, based on the analysis of the autocorrelation function of the multicomponent signal, we propose a common period estimation and data block technique to segment the received. A study of spacetime stap and spacefrequency adaptive processing sfap techniques for interference suppression in digital spread spectrum receivers is. Spacetime adaptive processing for gps antijamming receiver. This has implications for the adaptive process with the increased degrees of freedom dof providing greater. Introduction the applications of wireless communications are rapidly expanding from voice transmission to a wide class of multimedia information.
The system can use signal processing techniques such as spacefrequency adaptive processing using ffts for instance, to filter jamming or other interference signals from communications or positioning signals. Wright and wells compare predoppler and postdoppler architectures for application with spacebased radar. Bistatic fdamimo radar spacetime adaptive processing. This paper outlines the development of a multipleclockcycle implementation mci of a signal adaptive twodimensional 2d system for spacespatialfrequency ssf signal analysis. A spacefrequency antijamming algorithm based on subband. Design of optimized codes for radar spacetime adaptive processing a. Space time adaptive processing for radio frequency. Adaptive beam forming and space time adaptive processing. In this section, we will therefore discuss only problems peculiar to spacetime adaptive processing, along with possible mitigation techniques if available.
Orderstatistics, wavelet shrinkage, and bilateral filtering 158 3. A frequency division design for orthogonal transmit waveforms is presented. Pdf spacerange adaptive processing for rangecoupled. Principles of space time adaptive processing 3rd edition. Chapter 12 of this section, spacetime adaptive processing for radar, is entirely devoted to stap. Traditionally, adaptive processing has focused on the space and time dimensions.
Kealey and flnley as well as blckert compared pre and postdoppler stap on the basis of airborne clutter data. However, adding time taps to allow spacetime adaptive processing stap yields a finite impulse response filter that may distort the spreadspectrum gps ranging signal. Farina abstract in this paper, we deal with the problem of constrained code optimization for radar spacetime adaptive processing stap in the presence of colored gaussian disturbance. We discuss a total of five different processing schemes. Preprint 1 polyphase waveform design for mimo radar space. Explore space time adaptive processing with free download of seminar report and ppt in pdf and doc format. Adaptive processing in high frequency surface wave radar master of applied science thesis edward s. The practical relevance of stap lies in its ability to suppress clutter from airborne and spacebased radar systems, where, depending on angle and range, clutter is spread in doppler frequency. In this paper, the performance loss caused by the aperture fill phenomena and heavy computational burden in broadband adaptive beamforming adbf is analyzed, and an efficient approach based on frequencyspace cascade processing is presented. Additionally, sidelobe clutter present at those doppler frequencies away from.
Verly, braham himed, richard klemm and marc lesturgie citation. Ward, spacetime adaptive processing for airborne radar, technical report 1015, mit lincoln laboratory, dec. To enhance the multiple interference suppression performance of global navigation satellite system gnss receivers without extra antenna elements, a spacetimefrequency adaptive processor stfap is investigated. Multipleinput singleoutput synthetic aperture radar and. In particular, the invention relates to using spacefrequency adaptive processing sfap for providing antijam functionality.
Graduate program in electrical and computer engineering the ohio state university 2010 thesis committee. Adaptive spacefrequency processing for distributed. Scribd is the worlds largest social reading and publishing site. Phased array system toolbox algorithms perform spacetime adaptive processing stap. To this end, we adopt a multiple transmit, single receive miso architecture. In this paper, the performance of a spacefrequency adaptive processor receiving a spread spectrum like communications signal in strong rfi environment is studied. Space time adaptive processing stap with digital down converters. Adaptive beam forming and space time adaptive processing free download as powerpoint presentation. Reconfigurable computing for spacetime adaptive processing nikhil d. In a distributed aperture, the waveform dimension augments the traditional spacetimerange data cube. Stap processing combines temporal and spatial filtering to nullify interfering jammers. Adaptive processing of brain signals signal processing. The interfering scenario consists of wideband as well as narrowband jammers.
Detection and imaging of the moving target using frequency. Adaptive spacefrequency processing for distributed aperture radars conference paper pdf available in ieee national radar conference proceedings june 2003 with 98 reads how we measure reads. Spacefrequency adaptive processing sfap for radio frequency interference mitigation in spreadspectrum receivers abstract. Stap has been mainly considered for slar sideways looking airborne radar where a linear relationship between the angular location and doppler frequency of the clutter can be exploited. Spacetime adaptive processing stap has been a wellestablished technique, whose basic concept and theory are first put forward by brennan and reed. Introduction to spacetime adaptive processing matlab. Ground clutter is extended in both angle and range, and is spread in doppler frequency because of the platform motion. No attempt is made to comment on physiological aspects of brain activity. William melvin describes a number of key aspects of stap and a number of approaches to design optimal detectors. Advanced airborne radar systems are required to detect targets in the presence of both clutter and jamming. Spacetimefrequency adaptive processor for multiple. Radio frequency identification rfid demands power efficiency, better reading ranges, tracking tag signals and interference mitigation. More particularly still, the invention relates to computational enhancements of spacefrequency adaptive processing for gps antijamming applications. Space time adaptive processing for manoeuvring airborne radar.
Spacetime adaptive processing a thesis presented in partial ful. In this book, the field of adaptive learning and processing is extended to arguably one of its most important contexts which is the understanding and analysis of brain signals. Department of electrical and computer engineering university of toronto by oliver saleh 2008 abstract high frequency surface wave radarhfswr is a radar technology that o. Adve department of electrical and computer engineering university of toronto 10 kings college road toronto, on m5s 3g4, canada tel. Blunt1, ieee fellow, justin metcalf 2, ieee member, john jakabosky1,3, ieee member, james stiles1, ieee senior member, braham himed2, ieee fellow this work was supported in part by a subcontract.
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