Specifications

BATS AND PORTABLE BATS OPERATION
3-87
3.7.2.3 “POREG” DATA OUTPUT FORMAT
Applicable To: TP3 Model 4450A, TP3P Model 4430C, BATS Model 4460C & BATS-P Model 4461C
Output sentence for Format NMEA “G” (Trackman Out Only)
Message Name: POREG
$POREG RS-232 Parameter Description
TARGET NUMBER: The TARGET NUMBER (#) represents the various target symbols and can
range from 00 to 99. (“00” is the simulated target.) The zero is output when in the self-test mode
to indicate that the RS-232 data is simulated.
TIME: The TIME value is related to the time of signal reception at the Hydrophone. In BATS the
reply detect is accurate to within approximately 35ms. (NOTE: The time at which the sentence is
transmitted from BATS is one interrogation cycle behind the actual detect time. E.g., if Interroga-
tion rate is 3 seconds then the time the data is sent out the RS232 port is about 3 seconds after
the reply detection. But, the time that is attached to the target position sentence is the actual time
that the reply arrived at the hydrophone.)
PHASE A, B, C: The Phase is the time-counts between each element based on the element spacing
and the phase counter clock (50MHz).
TARGET QUALITY FACTOR: The TARGET QUALITY FACTOR is a value (1-10) determined by
the system on each reply that is detected. The system uses the phase or time counts from each of
the hydrophone elements to determine the quality of the target’s signal. If the phase counts are
consistent on all three channels throughout the reply burst the quality factor is very high. If the
phase counts have jitter or are inconsistent then the quality factor is low. (NOTE: In BATS there is
a minimum QF threshold that is set to 3. If the data processed has a QF of 3 or lower the position
will not be plotted. See advanced users guide to over-ride this value in Trackman software. )
ERROR CODE: The ERROR CODE or WARNING CODE is a one- or two- digit error code indicat-
ing that the data received could not be used for a valid position fix, or it can represent a warning to
let an operator know that the position accuracy could be compromised. See section 3.5.
TARGET SLANT RANGE: The Target SLANT RANGE is the measured travel time between the hy-
drophone and the transponder. It is output only in meters. The Slant Range is the actual measured
slant range to the transponder or responder. In transponder or responder mode no hydrophone
offsets are applied to the data. If in Pinger mode it is a calculated value with offsets applied if ap-
plicable. (See NOTE below.)