In receivers with frequency conversion, false artificial signals, so-called "Birds", may occur at the frequencies and their harmonics of internal heterodynes. The SDR receiver HackRF One is implemented using a double frequency conversion scheme. The peculiarity of artifacts is that their frequency changes depending on the range and method of processing. This, in particular, makes it possible to distinguish artifacts from true signals.
Can anyone help me find documentation on spectral processing algorithms in HaсkRF & PortaPack?
Please don't send me links to huge libraries of complete source code for the entire system. I need specific guidance on implementation details.
Thank you for your participation. One possible way to suppress false signals is to compare spectra for two different center frequencies.
But the question remains. References to algorithms for constructing spectra in a wide frequency range are needed.
To clarify the question, I provide a description of the heterodyne tuning algorithm that I found in the software package.
Data HackRF One Frequency Tuning
As follows from the algorithm, it must be protected from the manifestation of artifacts caused by the harmonics of the heterodynes. However, an artifact appears on the spectra near the frequency of 5100 MHz.
What is the source of this artifact?
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