Specifications

BATS AND PORTABLE BATS OPERATION

3-60

3.4 TRACKING TRANSPONDERS, RESPONDERS AND PINGERS

The BATS tracks up to four (4) Beacons (non-telemetry) simultaneously, consecutively or a combi-

nation of simultaneously/consecutive targets.

"Multiple Target Tracking" consists of a maximum of any of the following combinations of target

types that can be enabled at one time (each transponder or responder can also include telemetry):

4 Transponders

1 Responder

1 Responder and 3 Transponders

1 Pinger

1 Externally Triggered Responder or Transponder (Target Channel #1 becomes the master

trigger for all other targets enabled)

Rules…

 Only target #1’s Trigger Input can be used as the external trigger source.

 Once target #1 is configured for external trigger mode (BEACON/ACOUSTIC PARAMETERS

tab) all other targets are triggered externally also.

 Internal or External Triggering: As long as the targets interrogation frequencies are different

the system will sequence through all the targets, interrogating one at a time.

 Internal or External Triggering: If any targets interrogation frequency are the same, the

system will process the replies simultaneously

 The receive LED flashes at the beginning of the next interrogation cycle. All processing is

performed at the end of the interrogation cycle to determine detection. When targets are

being tracked in sequence it will appear as if the previous reply arrived late when in fact it

was only delayed due to processing.

 Receive LED’s will not flash for the telemetry reply.

 Internal or External Triggering: A trigger out key is available on each targets interrogation

cycle. This can be used to trigger responder type targets.

When tracking simultaneously there is a chance of the beacon replies arriving at the hydrophone

at the same time. In these cases the data will be corrupt and the result is typically a low quality

factor which causes that errant data point to be filtered out. In a dynamic tracking environment

this usually occurs sporadically and does not disturb the tracking of the targets.