Ionosphere-induced first and higher order errors for space based SAR
Ionosphere-induced first and higher order errors for space based SAR
- Author(s): D.P. Belcher and H.J. Strangeways
- DOI: 10.1049/cp.2009.0048
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- Author(s): D.P. Belcher and H.J. Strangeways Source: IET 11th International Conference on Ionospheric Radio Systems and Techniques (IRST 2009), 2009 p. 122 – 126
- Conference: IET 11th International Conference on Ionospheric Radio Systems and Techniques (IRST 2009)
- DOI: 10.1049/cp.2009.0048
- ISBN: 978 1 84919 123 4
- Location: Edinburgh, UK
- Conference date: 28-30 April 2009
- Format: PDF
Satellite borne SARs need to be operated at low frequencies (HF, VHF) to obtain 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 model) to assess accurately these higher order terms for a SAR at 600 km altitude for different ionospheric conditions.
Inspec keywords: ionospheric electromagnetic wave propagation; spaceborne radar; synthetic aperture radar; electron density
Subjects: Radar theory; Electromagnetic wave propagation; Radar equipment, systems and applications; Ionospheric electromagnetic wave propagation
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