The NRL lunar radar system is being used to make long term, precision Earth-Moon distance measurements. A pulse compression ratio of 104 permits a high signal to noise ratio for a range resolution of 1.2 μs (180 meters). The high pulse compression ratio is achieved through the use of a pseudorandom (P-N) code, phase reversal modulation of the carrier, and a multichannel cross-correlation receiver. The transmitted signal is phase modulated by the P-N code. This code has a correlation function which permits separation of the echo in range. In each correlator, the echo is multiplied by a replica of the code with an appropriate delay, and the product is passed through a narrow band filter. The correlator output measures the energy of the echo from a range interval corresponding to the delay chosen. A separate correlator is used for each of 40 adjacent range channels. The correlation circuitry consists of ring modulators, crystal filters, and envelope detectors. The ring modulators permit compact and economical packaging of the 40 correlators. The multiple outputs are recorded on magnetic tape for analysis and are also displayed in realtime.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Signal Processing Techniques for a Lunar Radar System


    Beteiligte:
    Hammond, D. L. (Autor:in) / Morden, R. E. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    01.11.1966


    Format / Umfang :

    1262418 byte




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Lunar SOURCE: Lunar SOUnding Radar Cubesat Experiment

    Convenevole, Carlo / Valigi, Nicolo / Guiglia, Francesco et al. | IEEE | 2020


    The Apollo Lunar Sounder radar system

    Porcello, L. J. / Zelenka, J. S. / Adams, G. F. et al. | NTRS | 1974



    A millimeter-wave lunar radar.

    Crocker, E. A. / Mccue, J. J. G. | NTRS | 1968


    Lunar surface Surveyor radar response.

    Brown, W. E., Jr. | NTRS | 1967