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Lookup NU author(s): Dr Hal Strangeways
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Satellite borne SArs need to be operated at low frequencies (HF, VHF) to botain good penetration through vegetation. At these lower frequencies the effect of the ionosphere is appreciable and the phase variation (in radians) with frequency is higher order than f−1. The magnitude of these higher order phase terms in f−2 and f−3 (in radians) are determined for all frequencies between 50 and 100 MHz for both magneto-ionic modes and for a range of elevations and azimuths )with respect to the magnetic meridian), time of day, month of the year and R12. Calculations are performed for a realistic 3D electron density distribution including both vertical and horizontal gradients of electron density (given by the NeQuick mode) to assess accurately these higher order terms for a SAR at 600 km altitude for dirrerent ionospheric conditions.
Author(s): Belcher D, Strangeways HJ
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: 11th International Conference on Ionospheric Radio Systems and Techniques
Year of Conference: 2009
Pages: 122-126
ISSN: 0537-9989
Publisher: IET
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5235583
Library holdings: Search Newcastle University Library for this item
ISBN: 9781849191234
