Anyone with a smart phone is familiar with High Dynamic Range (HDR) displays to improve photos. HDR mode, in the GNSS world, is used to amplify the bandwidth details that an operator wants to track and suppresses everything else.
Casiano further explains, “If a transmitting modem is affecting a wide part of the spectrum, the HDR feature will float a selected frequency to a higher level and thereby suppress the unwanted frequencies that are happening in the same spectrum. We’re essentially amplifying the optimal GNSS signal above all else, making sure it has the best chance of making it into the receiver.”
The HDR capability is best used during the integration phase of a system development. The developer would likely incorporate the feature and budget the necessary power in the receiver to give the operator flexibility.
“With HDR, we are basically adding contrast to good and bad signals,” says Casiano. “Bolstering the compromised signals gives the operator a better chance of working through an interference event.”
Developers configure the front end mode for each RF path to the firmware default or specify the HDR mitigation method. The combination of the ITK’s notch filter and HDR mode can also help suppress a continuous wave interferer.
The Interference Toolkit and the HDR features are just two of the capabilities built into the OEM7 receivers. Current development is focused on the holy grail of GNSS interference—automated interference detection, management and mitigation.
Casiano concludes, “Right now, we can detect and manually mitigate interference, this sets the stage towards the automation of interference mitigation without user intervention.”