More particularly still, the invention relates to computational enhancements of spacefrequency adaptive processing for gps antijamming applications. Chapter 12 of this section, spacetime adaptive processing for radar, is entirely devoted to stap. The spatial steering vector is related to the look direction while the temporal steering vector. Pdf adaptive spacefrequency processing for distributed. Graduate program in electrical and computer engineering the ohio state university 2010 thesis committee. 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 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. You can use stap processing to detect slowmoving or stationary targets in background clutter. The list of acronyms and abbreviations related to sfap spacefrequency adaptive processing. In the following sections, we simulate returns from target, clutter, and jammer and illustrate how stap techniques filter the interference from the received signal. Pdf spacerange adaptive processing for rangecoupled. Scribd is the worlds largest social reading and publishing site. Space time adaptive processing for manoeuvring airborne radar.
Spacefrequency adaptive processing sfap for radio frequency interference mitigation in spreadspectrum receivers abstract. Kealey and flnley as well as blckert compared pre and postdoppler stap on the basis of airborne clutter data. In view of the above problems, this paper proposes a spacetimefrequency adaptive processor stfap by combining tf analysis and spatial processing. A subspace method for mimo radar spacetime adaptive processing chunyang chen and p.
Multipleinput singleoutput synthetic aperture radar and. A study of spacetime stap and spacefrequency adaptive processing sfap techniques for interference suppression in digital spread spectrum receivers is. Introduction to spacetime adaptive processing matlab. Spacefrequency adaptive processing sfap for rfi mitigation in spread spectrum receivers abstract.
Traditionally, adaptive processing has focused on the space and time dimensions leading to spacetime adaptive processing stap. 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. Traditionally, adaptive processing has focused on the space and time dimensions. Adaptive processing in high frequency surface wave radar master of applied science thesis edward s. Advanced airborne radar systems are required to detect targets in the presence of both clutter and jamming. Krolik, mimo radar spacetime adaptive processing for multipath clutter mitigation, in fourth ieee workshop on sensor array and multichannel processing, 2006, pp. Short course on spacetime adaptive processing raviraj s. 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. Bistatic fdamimo radar spacetime adaptive processing.
Due to the equivalence of frequency and direction as perceived by a narrowband array a broadband jammer appears to be spread in angle. Spacetime adaptive processing stap some performance. Subband array implementations for spacetime adaptive. Ground clutter is extended in both angle and range, and is spread in doppler frequency because of the platform motion. In a distributed aperture, the waveform dimension augments the traditional spacetimerange data cube. Orderstatistics, wavelet shrinkage, and bilateral filtering 158 3.
We discuss a total of five different processing schemes. Adaptive array processing for gps interference rejection. Military application of spacetime adaptive processing dtic. In this chapter some consideration on spacefrequency domain processing are made. No attempt is made to comment on physiological aspects of brain activity. Research institute for highfrequency physics and radar techniques fhr. 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. Detection and imaging of the moving target using frequency. Radio frequency identification rfid demands power efficiency, better reading ranges, tracking tag signals and interference mitigation. In this section, we will therefore discuss only problems peculiar to spacetime adaptive processing, along with possible mitigation techniques if available.
Adaptive beam forming and space time adaptive processing. An efficient broadband adaptive beamforming algorithm. Abstractspacetime adaptive processing stap is a technique for processing signals from multiple antenna elements over multiple time periods for target detection. Augmenting synthetic aperture radar with space time. Additionally, sidelobe clutter present at those doppler frequencies away from. Spacerange adaptive processing for rangecoupled radar imaging. T, is available at the beamformer input for processing, where x mn is the nth signal sample at the mth antenna. 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. Space frequency adaptive processing sfap for radio frequency interference mitigation in spread spectrum receivers article in ieee transactions on antennas and propagation 526. In particular, the invention relates to using spacefrequency adaptive processing sfap for providing antijam functionality.
Principles of space time adaptive processing 3rd edition. Wright and wells compare predoppler and postdoppler architectures for application with spacebased radar. The performance of narrowband sfap is studied when the time domain samples are multiplied by a window function. Reconfigurable computing for spacetime adaptive processing. 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. The topic of multielement steered beam and adaptive antenna arrays has received attention within the gps. 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 has been a wellestablished technique, whose basic concept and theory are first put forward by brennan and reed. 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. 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. Spacetime adaptive processing for gps antijamming receiver.
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. Ward, spacetime adaptive processing for airborne radar, technical report 1015, mit lincoln laboratory, dec. Under the assumption of existence of sufficient independent and identically distributed iid training data, stap has excellent performance in suppressing the spacetime coupled. Spacetimewaveform adaptive processing for frequency. Adve department of electrical and computer engineering university of toronto 10 kings college road toronto, on m5s 3g4, canada tel. As stap algorithms are typical run on airborne platforms, they need to be both high performance and energyef. A frequency division design for orthogonal transmit waveforms is presented. The interfering scenario consists of wideband as well as narrowband jammers. 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. Alsfe consists of 1 to k detection stages k stages in fig. However, adding time taps to allow spacetime adaptive processing stap yields a finite impulse response filter that may distort the spreadspectrum gps ranging signal. A spacefrequency antijamming algorithm based on subband.
Adaptive spacefrequency processing for distributed. Spacetime adaptive processing a thesis presented in partial ful. Explore space time adaptive processing with free download of seminar report and ppt in pdf and doc format. We identify the signal components comprising the transmitted and received waveforms and organize it in a spacetime data vector.
Spacetime adaptive processing stap refers to the simultaneous processing of the signals from an array antenna during a multiple pulse coherent waveform. Spacetimefrequency adaptive processor for multiple interference. Space time adaptive processing seminar report, ppt, pdf. 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.
This paper outlines the development of a multipleclockcycle implementation mci of a signal adaptive twodimensional 2d system for spacespatialfrequency ssf signal analysis. West department of computer science box 43104 texas tech university lubbock, tx 794093104 usa tel. Space time adaptive processing stap with digital down converters. 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. Adaptive beam forming and space time adaptive processing free download as powerpoint presentation. Preprint 1 polyphase waveform design for mimo radar space. Design of optimized codes for radar spacetime adaptive processing a. Stap processing combines temporal and spatial filtering to nullify interfering jammers. In this thesis, we investigate the computational complexity, realization requirements and detection performance of spacetime adaptive processing stap for radar surveillance radar system. 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.
In this paper, a smart antenna processing for rfid systems is implemented. Introduction spacetime adaptive processing stap refers to a class of. 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. When we discuss radars we normally consider the processes of beam forming, matched filtering and doppler processing separately.
This has implications for the adaptive process with the increased degrees of freedom dof providing greater. Adaptive processing of brain signals signal processing. The design is based on a method for improved ssf representation of. Spacetime adaptive processing stap has been shown to be an effective technique for interference cancellation and target detection in airborne monostatic radar. 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. Verly, braham himed, richard klemm and marc lesturgie citation. Space frequency adaptive processing sfap for radio. Spacetimefrequency adaptive processor for multiple. Introduction the applications of wireless communications are rapidly expanding from voice transmission to a wide class of multimedia information. William melvin describes a number of key aspects of stap and a number of approaches to design optimal detectors. Reconfigurable computing for spacetime adaptive processing nikhil d. An increase in sinr serves to separate the pdfs for null and hypothesis.
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