Safran CORTEX CRT Quantum User Manual page 54

Doppler Measurement
1.6.4.

Measurement technique

Measurement rate

Measurement sampling rate

Phase measurement resolution

Phase values

Phase counter capacity

Doppler data

Performances vs noise
© Safran Data Systems
COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
By tracking the phase variations on the IF Receiver PLL
10 ms
User-programmable from 0.1 to 10 seconds (TCP-IP level)
360
(in degrees)
11
2
64-bit words
≈ 4 years (at 70 MHz)
32-bit frequency offsets (computed by the CORTEX software, based on
the programmed sampling rate), or 64-bit phase counter values
Phase measurement jitter vs noise:
��
����������
where 2Bn is the programmed IFR PLL loop bandwidth (in Hz)
Frequency jitter vs noise (*):
��
��������
where Ts is the programmed integration time (in seconds)
Range rate jitter vs noise (*):
��
��������
(*) Frequency & range rate computation not supported by the CORTEX.
This document is the property of Safran Data Systems.
It cannot be duplicated or distributed without expressed written consent.
2��
��
= √
(in radian)
��
2
�� 0
√ 2
= ��
(in Hz)
����������
2����
��
√ 2
= ��
(in Hz)
����������
2����
��
Ref. DTU 100042
Is.Rev. 5.17
Date: Dec. 03, 2021Sept.
30, 2021
Page 29