• Login
    View Item 
    •   FFI Publications Home
    • Publications
    • Rapporter
    • View Item
    •   FFI Publications Home
    • Publications
    • Rapporter
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    DVB-T based Passive Bistatic Radar

    View/Open
    10-01262.pdf (12.17Mb)
    Date
    2010
    Author
    Christiansen, Jonas Myhre
    Metadata
    Show full item record
    Abstract
    The interest for bi- and multistatic radar systems has gone in cycles of approximately 15 years. Currently we are at the peak of such a cycle, which mainly is driven by the interest for Passive Bistatic Radar systems. The most well-known Passive Bistatic Radar systems are Silent Sentry 3 developed by Lockheed Martin, and the Home Alerter 100 developed by Thales. Passive Bistatic Radar systems offer covert air surveillance at a potentially low cost. However, the emerging systems Silent Sentry 3 and Home Alerter 100 are based on FM-radio transmitters of opportunity, where the main drawback is the relatively low bandwidth, resulting in poor range resolution. The long integration time yields fine Doppler resolution. The next generation Passive Bistatic Radar systems will be based on digital transmitters like the Digital Video Broadcast - Terrestrial signals. These systems will not have the range resolution problem, but rather be facing the situation of targets moving through both range and Doppler bins during the system’s signal integration time. Long integration time gives fine Doppler resolution, and problems due to Doppler walk may arise. The relatively high bandwidth of the Digital Video Broadcast - Terrestrial signal gives fine range resolution, and problems due to range walk may arise. These problems have been analyzed in this work, with both simulated and experimental data. Range walk is shown to cause problems for targets having normal velocity and maneuverability, i.e. sub sound velocity aircrafts. Loss of target signal-to-noise ratio when using long integration times were demonstrated by simulations and real life data processing. Doppler walk was shown to be a more rare phenomenon, mostly due to the low maneuverability and speed of the targets of opportunity. However, in the simulated case, Doppler walk of high bistatic accelerated targets is shown. In order to compensate for the range walk, a method to lower the effects of range walk is studied. The method is based on the Doppler information in the Doppler-delay processing. An adaptive processing scheme is proposed, and the advantages and disadvantages are discussed.
     
    Interessen for bi- og multistatiske radarsystemer har g°att i sykler p°a ca. 15°ar. Interessen er for øyeblikket p°a topp hovedsaklig drevet av interressen for Passive Bistatic Radar systemer. De mest kjente Passive Bistatic Radar systemene er Silent Sentry 3 utviklet av Lockheed Martin, og Home Alerter 100 utviklet av Thales. Passive Bistatic Radar systemer har mulighet for skjult luftoverv°aking til en potensielt lav kostnad. Systemer som Silent Sentry 3 og Home Alerter 100 er basert p°a bruk av FM sendere, hvor hovedulempen er lav b°andbredde som gir en d°arlig avstandsoppløsning. Den lange integrasjonstiden gir en god Doppler-oppløsning. Den neste generasjon Passive Bistatic Radar systemer, basert p°a digitale sendere slik som Digital Video Broadcast - Terrestrial har ikke problemet med avstandsoppløsning, men vil heller ha tilfeller hvor m°alet g°ar gjennom flere avstands- eller Doppler-celler i integrasjonsintervallet. Lang integrasjonstid gir liten Doppler-oppløsning, og problemer grunnet Doppler-spredning kan oppst°a. Den relativt høye b°andbredden i Digital Video Broadcast - Terrestrial systemet gir lav avstandsoppløsning, og problemer grunnet avstandspredning kan oppst°a. I dette arbeidet har problemene blitt analysert med b°ade simulerte og eksperimentelle data. Avstandspredning skaper problemer for m°al med normal hastighet og manøvrerbarhet, mao. fly med underlydshastighet. Tap av signal til støy forhold ved bruk av lange integrasjonsintervaller er demonstrert med b°ade simuleringer og eksperimentelle data. Doppler-spredning er ett sjeldnere fenomen, mest grunnet lav manøvrerbarhet og hastighet for m°alene. I simuleringer er Doppler-spredning for m°al med høy bistatisk akselerasjon vist. En metode for °a kompensere for avstandspredning er analysert. Denne metoden bruker Doppler-informasjon i Doppler-delay prosesseringen. Et adaptivt proseeseringskjema er foresl°att, samt fordeler og ulemper er diskutert.
     
    URI
    http://hdl.handle.net/20.500.12242/2432
    Collections
    • Rapporter

    Browse

    All of FFI PublicationsCommunities & CollectionsBy Issue DateAuthorsTitlesThis CollectionBy Issue DateAuthorsTitles

    My Account

    Login

    CONTACT US

    • FFI Kjeller
      FFI, PO Box 25, 2027 Kjeller
    • Office Address: Instituttvn 20,
      Phone 63 80 70 00
    • biblioteket@ffi.no

    HELPFUL

    • About FFI
    • Career
    • Reports

    Sitemap

    • About cookies (cookies)
    • Newsletter
    • Sitemap

    FOLLOW US

     

     

    © Copyright Norwegian Defence Research Establishment
    Powered by KnowledgeArc