The environment that is being examined in this demonstration consists of 6 emitters:

Gen_Video0:  4-element/4-position Stagger, Avg PRI = 40 µs, PW = 1 µs,

Scan time = 2.8 s, Illumination time = 0.25 s.
 

Gen_Video1:  4-element/16-position Stagger, Avg PRI = 661 µs, PW = 1 µs,

Scan time = 0.75 s, Illumination time = 0.1 s.
 

Gen_Video2:  5-element/25-position Stagger, Avg PRI = 480 µs, PW = 8 µs,

Scan time = 0.49 s, Illumination time = 0.054 s.
 

Gen_Video3:  Constant PRI = 6.3 µs, PW = 0.5 µs,

Scan time = 1.3 s, Illumination time = 0.045 s.
 

Gen_Video4:  Constant PRI = 36.5 µs, PW = 2.6 µs,

Scan time = 3.3 s, Illumination time = 0.017 s.
 

Gen_Video5:  Constant PRI = 23 µs, PW = 2 µs,

Scan time = 4.8 s, Illumination time = 0.058 s.

All emitters have been programmed with a random 5% pulse drop out.

This environment can be quick tricky for many conventional PRI trackers as the emitters have about 25% of their total illumination times interleaved with other emitters. 

This figure shows the entire capture which covers about 8 seconds of data. 

The top 6 traces (Gen_Video0 to Gen_Video5) show the pulse trains from the six individual emitters and are provide here only as an aid to seeing what is going on in the demonstration.  The actual detected video signal, Video_In, is the sum of these six patterns.

By comparing the DRFM_Write, Video_In and Gen_Video2 traces, it is clear that the PRED is properly controlling the DRFM to record pulses only from the desired emitter (Gen_Video2).

Notice that throughout this 8 second capture, the  Stagger_Position output reads “025” indicating that the PRED has managed to maintain lock throughout this period to the 25-position pattern as desired.  Had a breaklock occurred, Stagger_position would have transitioned to “000” indicating that a full acquisition had been performed.