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3.6.1.4. Continuous Mode (All modes except INMARSAT and LMCO)
In ESA-tone, ESA-like, ESA-Code, PN Ranging and USB standards, it is possible to keep on sending the
major tone and ranging continuously after the normal sequence termination. This mode is activated by setting the
Number of Sequences to 0.
The Continuous mode is not strictly a new standard. It simply allows the Control Center to receive a continuous
range data stream without having to regularly send range requests to the CORTEX CRT.
When the Continuous mode is enabled:
The time interval between two consecutive measurements on the major tone is automatically changed
to 100 ms (instead of 250 ms).
Minor tones emission and ambiguity resolution is done only once upon reception of a range request on
the Ranging port.
The first ranging transaction response message sent over the Measurement port contains phase and
time measurements or only time measurements according to the received request. Subsequent
messages - received while the major tone is continuously transmitted - contain only time
measurements. The number of measurements in a ranging transaction response messages is
programmable (parameter Number of measurements on major tone).
On completion of the standard ESA, ESA-like or USB range sequence, the CORTEX keeps on
transmitting the major tone alone and the measurement phase extends until a Stop ranging request is
received.
In Continuous mode, the time interval between two consecutive ranging transaction response
messages depends on the programmed number of measurements and measurement sampling ratio.
Tone transmission stops on reception of a Stop ranging request.
© Safran Data Systems
COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
This document is the property of
It cannot be duplicated or distributed without expressed written consent.
Safran Data Systems
.
Ref.
DTU 100042
Is.Rev.
5.17
Date:
Dec.
03, 2021Sept. 30, 2021
Page 149
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