December 2018 trials pre-release

Active and Passive TCUs now run slightly different gateware due to the difference in REX and Passive Receivers interfacing.

Passive TCUs scan through pulses register to get X and L band frequencies. These values are sent once, in one UDP packet, to the Passive Receivers to set the operating frequencies at the start of an experiment. Therefore, you are limited to use constant X and L band frequencies for multistatic experiments.

Active TCU sends X/L band packets for every pulse in an experiment. This allows frequency agile experiments for a monostatic setup.

October 2018 Pretrials

Changelog

• Frequency setting to Passives/Rex via UDP packet
• Front panel interface

UDP frequency setting messages are sent in between each pulse for both active and passive TCU nodes.
This means that changing frequencies between experiments will result in distorted results as the passive receivers take some time (~65ms) to change.

It's recommended to run a short 'dummy' experiment to change passive frequencies before an actual experiment.

Due to this time delay for the passives, constant frequency values should be used for both bands for the entire experiment.

Verified during October pretrials at IMT via RF loopback.