In this figure the logic analyzer trace has been zoomed in to the area of the 1^st acquisition of the 5-element/25-position pattern (Gen_Video2).   A higher PRF signal (Gen_Video3) is already present when the PRED begins the acquisition process.  Despite this interference a lock is obtained on the desired signal, it is tracked (correctly) as a 25-position emitter and properly timed look-throughs are executed every 8 pulses as expected.

At one point quite soon after initial acquisition of the pattern (near sample 20,000), three emitters (Gen_Video1, Gen_Video2 and Gen_Video3) are being detected simultaneously but the PRED manages to maintain a lock on the Gen_Video2, successfully de-interleaving the pulse trains until the end of its illumination.  After generating the required (5) Expected_Video pulses as it was programmed, the Lock signal is brought low to indicate a loss of the desired signal.  At this point look-throughs are discontinued and the receiver stays on to look full-time for the emitter to return.

In order to more closely examine the lock-on, the logic analyzer is zoomed in closer and markers are used to measure the time from the start of the Gen_Video2 pulses to the lock transition.  This time is found to be 25.93 µs, corresponding to 54 PRI of the desired signal.  So, even with another (higher PRF) signal present, the PRED was able to acquire and track the desired 25-position pattern in just over 2 full frames of the pattern.