Navy radar operations are being curtailed in a littoral environment. This is due to two factors: the encroachment of cell phone systems into the naval radar bands; in-band interference from other radars. The spectral width of most pulsed radars is significantly wider than necessary with present modulation schemes. Most radars utilize some form of constant envelope pulse with phase or frequency modulation. This causes the spectrum to broaden to several times the information bandwidth. If both the amplitude and phase of the transmitted signal are allowed to change, a significantly narrower bandwidth can be achieved. The paper presents a method to create waveforms with instantaneous bandwidths of 20 MHz confined within -100 dB. The theoretical spectral results of three popular phase modulation schemes (phase shift keying, minimum phase shift keying and derivative phase shift keying) are compared with the spectrally clean results. In addition, the Chireix out-phasing method is presented as an alternative to generating amplitude and phase modulated waveforms. The Chireix method provides a way of improving the efficiency compared to the conventional class A power amplifier. Preliminary results are shown for a spectrally clean waveform.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    A spectrally clean transmitting system for solid-state phased-array radars


    Beteiligte:
    Faust, H.H. (Autor:in) / Connolly, B. (Autor:in) / Firestone, T.M. (Autor:in) / Chen, R.C. (Autor:in) / Cantrell, B.H. (Autor:in) / Mokole, E.L. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2004


    Format / Umfang :

    5 Seiten, 4 Quellen




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Silicon-germanium for phased array radars

    Berg, H. / Thiesies, H. / Hemmendorff, E. et al. | Tema Archiv | 2008


    Adaptive Beamforming for Phased Array Radars

    Nickel, U. | Online Contents | 1998


    CONTINUOUSLY STEERING PHASED ARRAY AND HEADLIGHT RADARS

    SHAMS SOREN | Europäisches Patentamt | 2022

    Freier Zugriff

    An interlaced phased array antenna for atmospheric radars

    Janardhanan, K. V. | Online Contents | 2001


    Cognitive radars in spectrally dense environments

    Stinco, Pietro / Greco, Maria / Gini, Fulvio et al. | IEEE | 2016