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Doc ID: FAQ13599
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Positioning Application: How can I relate a real GNSS antenna pattern in units of dBi to the antenna pattern editor which uses units of dB?
You can directly apply the real antenna pattern units in dBi as long as you bear in mind that the PosApp antenna pattern is dB of ATTENUATION. This means that a positive value will reduce the received power, whereas the real antenna pattern is likely to state negative values of dBi to show power reduction.
In the PosApp antenna pattern values of 0dB applied to the complete matrix will simulate a perfect, isotropic antenna, i.e. equal gain in all directions. Values of dBi are power relative to this perfect isotropic case. Therefore, if the real antenna pattern states that there is a value on the pattern cell of, for example, -5dBi, the you would apply +5dB on the antenna pattern; because you are reducing the power by 5dB relative to a perfect isotropic case.
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