SNIFT
TICRA
Accurate and highly stable transformation of measured spherical near-field antenna data to far fields, accounting for the full characteristics of the measuring probe.
Technical specifications
- Feature
- Allows full sphere or partial sphere input data
- Feature
- Full correction for axially symmetric (m=±1) probes
- Feature
- Fast Fourier Transformation and self-stabilising recurrence relations allow handling of even very large antenna structures
- Feature
- Industry standard for spherical near-field to far-field transformation with probe correction
- Feature
- Independent of the actual measurement system implementation
- Benefit
- Short transformation time
- Benefit
- Mathematically exact pattern transformation
- Benefit
- Output coordinate system may be rotated to coincide with the peak direction of the far field
- Benefit
- Non-Maxwellian measurement inaccuracies are averaged to physically correct output
- Benefit
- Noise reduction by means of high-order spherical mode filtering
About
SNIFT is the industry standard for spherical near-field to far-field transformation with probe correction, independent of the actual measurement system implementation. If only a certain region of the antenna pattern is of interest, truncated measurements can still be transformed with SNIFT; the supplementary program ROSCOE can then perform coordinate transformation into a system centered around the peak when the region of interest doesn’t coincide with the measurement coordinate axes. A well-founded choice of numerical implementation ensures a very stable algorithm, even for high-order harmonics — antennas with diameters exceeding several hundred wavelengths are handled within seconds on a standard PC with accurate determination of all involved spherical harmonics.
Documentation
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