IQ High Prec Power Spectrum
The IQ High Prec Power Spectrum block converts I/Q data via DOUBLE PRECISION real-time FFT to SPECTRA:
Left hand side Input:
- IQ
Right hand side Output:
- Spectra
The IQ High Prec Power Spectrum converts I/Q data in real-time to SPECTRA using an highly optimized double precision 64Bit FFT algorithm. Using SPECTRA instead of I/Q highly reduces the CPU load needed to later on display and/or process the spectrum data.
The FFT Size can be adjusted from 16 to 268 Million (depending on the DSP Memory Model setting which you can adjust under Extras -> Configuration -> Performance -> DSP Memory Model).
Please note that pushing the FFT size to the limit will need a lot of processing time (and power) and lots of CPU memory!
Some examples for the FFT calculation speed on a regular Intel i7-7820HQ processor :
- A 2 Million FFT needs around 1 s (@50% FFT overlap)
- A 16 Million FFT needs around 8 s (@50% FFT overlap)
- A 64 Million FFT needs around 35 s (@50% FFT overlap)
- A 268 Million FFT needs around 135 s (@50% FFT overlap)
The FFT Overlapping is fully adjustable (up to 99,9%).
The following FFT Windowing functions are available:
- Hamming
- Hann
- Uniform
- Blackmann
- Blackmann Harris
- Blackmann Harris 7
- Flat Top
A Screenshot comparing the regular 32Bit IQ Power Spectrum (left hand) and the 64Bit IQ High Prec Power Spectrum (right hand):
Typical Mission:
