Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991rasc...26..403h&link_type=abstract
Radio Science (ISSN 0048-6604), vol. 26, Mar.-Apr. 1991, p. 403-416.
Astronomy and Astrophysics
Astronomy
6
Astronomical Maps, Planetary Mapping, Radar Astronomy, Radar Targets, Continuous Radiation, Doppler Effect, Rotating Bodies, Waveforms
Scientific paper
The problem of delay-Doppler mapping of overspread targets, i.e., targets where the product of delay-extent theta(t) and Doppler width B(t) is greater than unity, is discussed. For a transmitter modulation waveform which is believed to be representative of continuous wave modulation, namely, a random Gaussian noise modulation, the effect of the 'self-noise' and the additive noise on the output signal-to-noise ratio is evaluated, and expressions are derived which allow the signal-to-noise ratio to be predicted an the quality of the mapping assessed for various types of targets and modulation waveform properties. The problem of the self-noise is shown to be a serious problem, particularly for targets where the power returned varies greatly with range. A scheme involving a combination of random noise modulation and polarization modulation is developed which will greatly improve the capability to map this type of overspread targets. The particular case of the mapping of Mars with an existing facility is dealt with in detail, and it is shown that a limited amount of mapping with a resolution corresponding to 100 by 100 points on the planet is possible in certain regions.
Hagfors Tor
Kofman Wlodek
No associations
LandOfFree
Mapping of overspread targets in radar astronomy does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Mapping of overspread targets in radar astronomy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mapping of overspread targets in radar astronomy will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1794207