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Synchronization
•
PRI Sync
PRI Sync (set with
Trigger Mode
on the
Sonar Setup
page of the
System Configuration
dialog box) provides ping synchronization with another Sonar Head or other acoustic
source that supports synchronization (for example, EK60, Sidescan, DVL, etc.). PRI
Sync is a level-sensitive method of synchronization. When the sync is held high, the
sonar will not transmit. The PRI Sync INPUT must be held low for 25μs in order to
trigger the Sonar Head. The Sonar Head will transmit a 100μs sync OUTPUT pulse when
configured as
Master
on the
Sonar Setup
page. The sync OUTPUT is generated each
time the Sonar Head transmits.
•
Host Time Sync Mode
Host
mode synchronizes the Sonar Head time with the computer time. This mode is
critical for Bathymetry applications.
Host
mode only works if the computer is connected
to an accurate time source, such as a GPS or network time server. When connecting to
the Sonar Head, it takes two minutes to synchronize the time to within five milliseconds.
•
1PPS Time Sync Mode
1PPS is a 0 to 5 VDC pulse, with a 50% duty cycle. The Sonar Head time can be
synchronized to external 1PPS pulses.
The time is synchronized to the rising edge of the 1PPS pulses. When the rising edge of a
1PPS pulse is detected then the ns, us and ms counters are set to zero. The second counter
is set to zero if the ms counter is < 500 and increased by 1 if the ms counter is >= 500.
1PPS synchronization requires ZDA input over UDP to the Sonar Head (not to the M3
Sonar FLS software) on UDP port 31100 at 1Hz.
The 1PPS signal must be sent to the Sonar Head using the 1PPS input on the following
cable:
– 10-pin SEA CON
®
MINK-10-CCPL cable with power, Ethernet, 1PPS, and Sync.
The Sonar Head must be upgraded to the latest firmware version (version 1.5 or later).
Performance specifications
These performance specifications summarize the main functional and operational
characteristics of the M3 Sonar FLS system.
•
Range
: 0.2 m to 200 m
•
Coverage
: 200°
•
Range resolution
: 1 cm
•
Frequencies
: 175 kHz, 190 kHz, 200 kHz, 225 kHz