SPX SPIDAR NIC-500s, Operation Manual

Page: 92 / 119

Appendix A: Data Collection Modes
84
3) Sequencing
An extension of Concurrent Receiver Operation is the ability to provide dynamic transmitter-
receiver pairing. The transmitter-receiver pairs can follow a specific sequence, thus allowing
additional data channels with no additional hardware. In this example, channels 2 and 3 are
created with no additional hardware when compared to the Interleaved Transmitter Operation
above.
In this configuration, there are 4 channels and data is captured into four .DT1 data files. This is
a mixture of concurrent and sequencing mode.
A sequence is similar to a series of events, which gets repeated over and over. In the example
above, there would be 2 Sequences: the first Sequence would feature Tx
1
firing, and the second
Sequence would feature Tx
2
firing.
Firing groups are used to define which receivers are listening to which transmitters in each
sequence. In the example above, there would be two firing groups. Tx
1
, Rx
1
& Rx
2
would be on
one firing group, and Tx
2
, Rx
1
and Rx
2
would be on another firing group.
The table below illustrates this by showing the firing groups for each sequence:
Antenna Sequence 1 Sequence 2
Tx
1
1 -
Tx
2
- 2
Rx
1
1 2
Rx
2
1 2
Data collection speed is 1/n, the total number of transmitters in the system, n.
Sequencing is only available in the NIC-500X.
Tx
1
Channel 1
Rx
1
Rx
2
Tx
2
Channel 4