COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
Ref. DTU 100042
Is.Rev. 5.17
Date: Dec. 03, 2021Sept.
30, 2021
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1.6.4. Doppler Measurement
Measurement technique By tracking the phase variations on the IF Receiver PLL
Measurement rate 10 ms
Measurement sampling rate User-programmable from 0.1 to 10 seconds (TCP-IP level)
Phase measurement resolution
(in degrees)
Phase values 64-bit words
Phase counter capacity ≈ 4 years (at 70 MHz)
Doppler data 32-bit frequency offsets (computed by the CORTEX software, based on
the programmed sampling rate), or 64-bit phase counter values
Performances vs noise Phase measurement jitter vs noise:
(in radian)
where 2Bn is the programmed IFR PLL loop bandwidth (in Hz)
Frequency jitter vs noise (*):
(in Hz)
where Ts is the programmed integration time (in seconds)
Range rate jitter vs noise (*):
(in Hz)
(*) Frequency & range rate computation not supported by the CORTEX.
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