Assume that our ADC can digitize real time RF at the rate of 500 MSps.

If each sample is one byte, that means our data rate is 500 MBytes per second.

If this data could be processed in real time, signal similarity could be good to 2 feet, since light travels a foot per nanosecond and we are digitizing every 2 nanoseconds.

Our GTF radios would then be useful if they were more than two feet apart.

Since GPS-disciplined Temporal filtering via an accurate Time standard is only good to 50 nanoseconds, give or take, we don't have to do better than that in our radio design. Thus our radios need to be at least 50 feet apart to be useful, and probably several times that.

The limit on our resolving power is thus 50 feet. We cannot filter out signals that are less than 50 feet or 50 nanoseconds different.

The fastest a DSL connection can transmit data is 0.2 MBytes per second.

A similar calculation shows 1000 MBtyes / 0.2 Mbytes = 5000 feet. 

This means

So GTF radios must communication directly with each other.

To digitize the RF band between DC and 1 GHz and then transmit that requires at least a GHz of bandwidth. This is a lot of wireless bandwidth.

Perhaps the radio’s could be wired together, or use lasers to relay the data.

You need at least OC-192 or 10 Gigabit Ethernet to carry this traffic. 10-G cards cost $1000 each.

Bits could be timestamped with RF bits streamed via dedicated 10G lines between nodes.

Observations would be correlated either at a single central station with sufficient bandwidth to do the real time process, or by arranging the stations such that they can take turns being the central station.