Specifications

BATS AND PORTABLE BATS OPERATION
3-23
PRN
Pseudo Random Number codes. These consist of a single frequency but with 180° phase shifts at
various bits within the sequence. Enter the frequency in kHz (in 1 Hz increments), the PRN code in
octal and chip length in micro-seconds increments (minimum chip length is 100.000 microsec-
onds). The PRN code describes the phase shifting pattern. The chip length is the waveform period
times the number of cycles.
Interrogation Parameters: The Interrogation Parameters consist of the Interrogation Interval,
the Interrogation Frequency and Trigger Source.
Select the Interrogation Interval (based on the slant
range to the target) in seconds and the Pulse Width
necessary to interrogate the beacon in milliseconds.
(In high multi-path environments it may be benefi-
cial to decrease pulse width to prevent multiple
triggering of the transponders.) Select whether the
beacon is being triggered internally by the BATS or
by an external source. If external then select the
edge that the BATS should synchronize the timing
with (+) or (-). If multiple targets are enabled then
a specific Beacon can be set as a “Priority” which
alternates interrogations between all the other ac-
tive targets.
If two or more targets have the same interrogation
frequency/code then the targets will be tracked
simultaneously. If the Interrogation Frequencies are
different then they will be tracked sequentially.
Trigger Source: Select either Internal or External
trigger source
10
.
External Key-In Polarity: Select either (+) or (-)
edge external trigger source.
10
Only Target #1 can be set to external trigger mode, becoming the master for all other targets.