Phase Plane Estimation - Wavecom · cording of a STANAG-4285 signal using W- ODE and a P sound...
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The screen shot to the leſt shows the high quality of an I/Q recording of a STANAG- 4285 signal using W-CODE and a G39DDC SDR. The quality is as good as the condions in the HF band allow. The signal arrives at the demodulator and the decoder with op- mum quality. I/Q demodulaon enables the direct recor- ding and decoding of all types of signals - including VHF/UHF directly modulated modes and satellite modes if a modern SDR is employed. A digital I/O signal faithfully reflects the qualityof the signal source. Using an I/Q in- put makes the adjustments and the prob- lems of sound card input superfluous. Using an W-PCIe or W-PCI IF input will pro- duce results similar to the ones achievable with I/Q signals. The screen shot to the leſt shows an AF re- cording of a STANAG-4285 signal using W- CODE and a PC sound card. The loss of qua- lity due to the acon of the sound card is clearly to be seen and will significantly de- grade any subsequent decoding. Applicaons that use a sound card as a si- gnal interface will suffer a significant loss of quality. In addion a sound card cannot ex- ploit signals in the VHF, UHF and SHF ranges or if the mixer is set to 12 kHz only to a li- mited degree. All commonly available sound cards also exhibit large sample rate deviaons of a magnitude of up to 2 % of their nominal rate. Albeit a number of applicaons enable fine speed correcons, this tech- nique negavely impacts signal quality. Phase plane presentaon of a STANAG-4285 I/Q recording Phase plane presentaon of a STANAG-4285 AF recording Application Note Phase Plane Esmaon
Transcript of Phase Plane Estimation - Wavecom · cording of a STANAG-4285 signal using W- ODE and a P sound...
The screen shot to the left shows the high quality of an I/Q recording of a STANAG-4285 signal using W-CODE and a G39DDC SDR. The quality is as good as the conditions in the HF band allow. The signal arrives at the demodulator and the decoder with opti-mum quality.
I/Q demodulation enables the direct recor-ding and decoding of all types of signals - including VHF/UHF directly modulated modes and satellite modes if a modern SDR is employed.
A digital I/O signal faithfully reflects the qualityof the signal source. Using an I/Q in-put makes the adjustments and the prob-lems of sound card input superfluous.
Using an W-PCIe or W-PCI IF input will pro-duce results similar to the ones achievable with I/Q signals.
The screen shot to the left shows an AF re-cording of a STANAG-4285 signal using W-CODE and a PC sound card. The loss of qua-lity due to the action of the sound card is clearly to be seen and will significantly de-grade any subsequent decoding.
Applications that use a sound card as a si-gnal interface will suffer a significant loss of quality. In addition a sound card cannot ex-ploit signals in the VHF, UHF and SHF ranges or if the mixer is set to 12 kHz only to a li-mited degree.
All commonly available sound cards also exhibit large sample rate deviations of a magnitude of up to 2 % of their nominal rate. Albeit a number of applications enable fine speed corrections, this tech-nique negatively impacts signal quality.
Phase plane presentation of a STANAG-4285 I/Q recording
Phase plane presentation of a STANAG-4285 AF recording
Application Note
Phase Plane Estimation
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Application Note
Phase Plane Estimation
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