← OAK Relay evidenceoakdefenseltd.comUnclassified · representational · generated 2026-10-12

OAK Relay — real sensor captures through the bridge

Each row is a recorded I/Q capture from an RF sensor receiver (recorder + analyser model named; serial numbers, network addresses and operator file names deliberately omitted), read by relay_sensor.py, measured, turned into an EMREP catalogue message,validated, carried through every binding and the DDIL bearer, and placed on the fused picture. Raw captures stay off the repository; this record carries the measurements.

capture instrument centre rate / BW slice pulses PW PRI (PRF) RF offset SNR call message
L-band 1.5000 GHz capture 111037ZAUG26 X-COM IQC5000 + Keysight N9030B 1.5000 GHz 125 MS/s / 100.2 MHz 4.29–4.39 s 1000 1.008 µs 100.00 µs (10000 Hz, FIXED) +25.7 kHz 46.7 dB PSK BARKER5 +++-+ (200 ns chips) / L EMREP serial 1 (6/6 bindings, 141 B packed, bearer HF delivered (0 retries))
X-band 9.4040 GHz capture 071243ZAUG26 X-COM IQC5000 + Keysight N9030B 9.4040 GHz 62 MS/s / 50.1 MHz 1.24–1.34 s 26 0.192 µs 1028.99 µs (972 Hz, STAGGER) -1222.9 kHz 50.2 dB PULSED / X EMREP serial 2 (6/6 bindings, 121 B packed, bearer HF delivered (0 retries))
X-band 8.5000 GHz capture 141223ZJUL26 X-COM IQC5000 + Keysight N9030B 8.5000 GHz 125 MS/s / 100.4 MHz 1.14–1.24 s 997 10.433 µs 100.33 µs (9967 Hz, FIXED) -0.2 kHz 11.7 dB PULSED / X EMREP serial 3 (6/6 bindings, 124 B packed, bearer HF delivered (0 retries))

Measurement method

A 0.1 s slice (12.5 M samples at 125 MS/s) is read from the recorder's .xdat; the envelope is thresholded at max(6 × noise RMS, 25 % of peak); each span gives width, time of arrival and peak; carrier offset is the mean phase increment over the central half of the pulse (edge transients excluded; resolution about 1 / PW); the first/last-third frequency difference, scaled to the full width and checked for consistency across pulses, gives a linear-FM sweep; phase steps of about 180° between otherwise steady chips give a binary phase code (chip length, sign sequence, Barker names); PRI statistics come from consecutive times of arrival. The result becomes an EMREP (sensor set + emitter set), is validated against the catalogue, exported and re-imported in every binding, packed and sent over the modelled HF bearer with store-and-forward, and correlated into the fused picture (relay_sensor.py, V&V EO-1 / EO-5 / DO-1, tests/test_sensor.py).

Picture

Ground truth

The 1.5 GHz generator capture was set to a Barker-5 phase code; the operator confirmed the setting on 2026-10-07 after the blind reading. The 9.4 GHz and 8.5 GHz captures are recordings of real emitters at the end user's facility and are reported as measured (no identification is claimed).