Design of optimized codes for radar spacetime adaptive processing a. No attempt is made to comment on physiological aspects of brain activity. Spacetime adaptive processing for airborne surveillance. 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. Verly, braham himed, richard klemm and marc lesturgie citation. 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. Space time adaptive processing for radio frequency. 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. Abstractspacetime adaptive processing stap is a technique for processing signals from multiple antenna elements over multiple time periods for target detection. Spacefrequency adaptive processing sfap for radio frequency interference mitigation in spreadspectrum receivers abstract. 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. You can use stap processing to detect slowmoving or stationary targets in background clutter.
Subband array implementations for spacetime adaptive. In a distributed aperture, the waveform dimension augments the traditional spacetimerange data cube. Preprint 1 polyphase waveform design for mimo radar space. Space frequency adaptive processing sfap for radio frequency interference mitigation in spread spectrum receivers article in ieee transactions on antennas and propagation 526. Spacetime adaptive processing for gps antijamming receiver. Spacetimefrequency adaptive processor for multiple. Adaptive processing in high frequency surface wave radar master of applied science thesis edward s. 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. Military application of spacetime adaptive processing dtic. 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.
Traditionally, adaptive processing has focused on the space and time dimensions. Additionally, sidelobe clutter present at those doppler frequencies away from. When we discuss radars we normally consider the processes of beam forming, matched filtering and doppler processing separately. Radio frequency identification rfid demands power efficiency, better reading ranges, tracking tag signals and interference mitigation. Alsfe consists of 1 to k detection stages k stages in fig. William melvin describes a number of key aspects of stap and a number of approaches to design optimal detectors. Spacefrequency adaptive processing sfap for rfi mitigation in spread spectrum receivers abstract.
Spacetime adaptive processing a thesis presented in partial ful. 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. Pdf adaptive spacefrequency processing for distributed. Adaptive processing of brain signals signal processing. Department of electrical and computer engineering university of toronto by oliver saleh 2008 abstract highfrequency surface wave radarhfswr is a radar technology that o. More particularly still, the invention relates to computational enhancements of spacefrequency adaptive processing for gps antijamming applications. Space time adaptive processing seminar report, ppt, pdf. To this end, we adopt a multiple transmit, single receive miso architecture. Introduction to spacetime adaptive processing matlab. The interfering scenario consists of wideband as well as narrowband jammers. In this paper, a smart antenna processing for rfid systems is implemented. Adaptive array processing for gps interference rejection. Orderstatistics, wavelet shrinkage, and bilateral filtering 158 3. Introduction the applications of wireless communications are rapidly expanding from voice transmission to a wide class of multimedia information.
An efficient broadband adaptive beamforming algorithm. 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. As stap algorithms are typical run on airborne platforms, they need to be both high performance and energyef. Explore space time adaptive processing with free download of seminar report and ppt in pdf and doc format. 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 stap some performance. Adaptive beam forming and space time adaptive processing free download as powerpoint presentation. The topic of multielement steered beam and adaptive antenna arrays has received attention within the gps. In this paper, the performance of a spacefrequency adaptive processor receiving a spread spectrum like communications signal in strong rfi environment is studied. Graduate program in electrical and computer engineering the ohio state university 2010 thesis committee. Space time adaptive processing for manoeuvring airborne radar. Space time adaptive processing stap with digital down converters. Pdf spacerange adaptive processing for rangecoupled. 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. Scribd is the worlds largest social reading and publishing site. 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.
A study of spacetime stap and spacefrequency adaptive processing sfap techniques for interference suppression in digital spread spectrum receivers is. Phased array system toolbox algorithms perform spacetime adaptive processing stap. A subspace method for mimo radar spacetime adaptive processing chunyang chen and p. The performance of narrowband sfap is studied when the time domain samples are multiplied by a window function. The system can use signal processing techniques such as spacefrequency adaptive processing using ffts for instance, to filter jamming or other interference signals from. Stap processing combines temporal and spatial filtering to nullify interfering jammers. Under the assumption of existence of sufficient independent and identically distributed iid training data, stap has excellent performance in suppressing the spacetime coupled. In this section, we will therefore discuss only problems peculiar to spacetime adaptive processing, along with possible mitigation techniques if available.
Short course on spacetime adaptive processing raviraj s. Advanced airborne radar systems are required to detect targets in the presence of both clutter and jamming. Research institute for highfrequency physics and radar techniques fhr. Spacetimefrequency adaptive processor for multiple interference. Spacerange adaptive processing for rangecoupled radar imaging. Reconfigurable computing for spacetime adaptive processing nikhil d. In the following sections, we simulate returns from target, clutter, and jammer and illustrate how stap techniques filter the interference from the received signal. In particular, the invention relates to using spacefrequency adaptive processing sfap for providing antijam functionality. T, is available at the beamformer input for processing, where x mn is the nth signal sample at the mth antenna. 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. Traditionally, adaptive processing has focused on the space and time dimensions leading to spacetime adaptive processing stap.
First, a digital compensation method is applied to compensate for the aperture fill time of the broadband phased array in the rangefrequency. Spacetime adaptive processing stap refers to the simultaneous processing of the signals from an array antenna during a multiple pulse coherent waveform. Krolik, mimo radar spacetime adaptive processing for multipath clutter mitigation, in fourth ieee workshop on sensor array and multichannel processing, 2006, pp. Ward, spacetime adaptive processing for airborne radar, technical report 1015, mit lincoln laboratory, dec. A spacefrequency antijamming algorithm based on subband. Spacetime adaptive processing stap has been a wellestablished technique, whose basic concept and theory are first put forward by brennan and reed. Ground clutter is extended in both angle and range, and is spread in doppler frequency because of the platform motion. Bistatic fdamimo radar spacetime adaptive processing.
In this chapter some consideration on spacefrequency domain processing are made. Reconfigurable computing for spacetime adaptive processing. However, adding time taps to allow spacetime adaptive processing stap yields a finite impulse response filter that may distort the spreadspectrum gps ranging signal. An increase in sinr serves to separate the pdfs for null and hypothesis. Adve department of electrical and computer engineering university of toronto 10 kings college road toronto, on m5s 3g4, canada tel. 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 design is based on a method for improved ssf representation of. Introduction spacetime adaptive processing stap refers to a class of.
Augmenting synthetic aperture radar with space time. Spacetimewaveform adaptive processing for frequency. This has implications for the adaptive process with the increased degrees of freedom dof providing greater. This paper outlines the development of a multipleclockcycle implementation mci of a signal adaptive twodimensional 2d system for spacespatialfrequency ssf signal analysis. Multipleinput singleoutput synthetic aperture radar and. In view of the above problems, this paper proposes a spacetimefrequency adaptive processor stfap by combining tf analysis and spatial processing. 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. West department of computer science box 43104 texas tech university lubbock, tx 794093104 usa tel.
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. In this thesis, we investigate the computational complexity, realization requirements and detection performance of spacetime adaptive processing stap for radar surveillance radar system. A spacetime adaptive processing stap algorithm which can reject interference in. Adaptive spacefrequency processing for distributed.
A subspace method for mimo radar spacetime adaptive. We identify the signal components comprising the transmitted and received waveforms and organize it in a spacetime data vector. Principles of space time adaptive processing 3rd edition. Space frequency adaptive processing sfap for radio. Due to the equivalence of frequency and direction as perceived by a narrowband array a broadband jammer appears to be spread in angle. The spatial steering vector is related to the look direction while the temporal steering vector. Kealey and flnley as well as blckert compared pre and postdoppler stap on the basis of airborne clutter data. 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. The list of acronyms and abbreviations related to sfap spacefrequency adaptive processing.
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