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diff --git a/08.-Passive-Radar.md b/08.-Passive-Radar.md index ea17026..493af49 100644 --- a/08.-Passive-Radar.md +++ b/08.-Passive-Radar.md @@ -72,6 +72,13 @@ We have included three preconfigured DAQ files that can be used which set optimi The optimal preconfig file will depend on the specific passive radar implementation and target type. So we recommend experimenting with each of the three preconfig files. +## Passive Radar Bandwidth Settings Guide +The larger the signal bandwidth the more resolution we can obtain from passive radar. The maximum sample rate/bandwidth that the KrakenSDR is capable of operating stably at is 2.4 MHz. + +If you are using wideband illuminators such as HDTV or 4/5G signals, you want to keep the bandwidth at the maximum of 2.4 MHz. This is the default as set in the pr_ preconfig files. + +If you are using DAB (or other more narrow illuminators), note that this only has a bandwidth of about 1.5 MHz. Therefore you will obtain better results if you adjust your bandwidth to match as you don't want to receive the noise floor along the sides of the illuminator. From a base of any pr_ preconfiguration, under the DAQ reconfiguration settings, change the sample rate to 1.4 MHz. And then hit the "Reconfigure & Restart DAQ chain" button. This may take 1-2 minutes before the software has restarted. + # Bistatic Range The graph provided is a bi-static range doppler graph. Bi-static means that the measurement consists of a transmitter and receiver separated by some distance. This can get complicated, as instead of getting a simple range distance value from the receiver, we end up with an ‘constant range ellipse’ of possible range solutions that depend on some calculations based on the transmitter and receiver positions. |