confused about waveform from guns

[apchar]

Looking on their web page at the spec sheet for the stalker the pulse width is 30 ns (ish) and the pulse frequency is 130 pps. I understand most LIDAR guns use about this pulse width and rate.
I took that to mean a single 30 ns pulse is emitted every 33 msec.
But I was perusing a jammer patent and it talks a little bit about the waveform transmitted by the guns. It looks like a cluster of pulses is transmitted (by the gun) instead of just one.
Which is it:
door #1: A single 30ns pulse is transmitted every 33 ms.
door #2: A group of N 30ns pulses is transmitted every 33 ms. Where N is small.
door #3: A 30ns cluster of N pulses (each with pulse width 30/2N ns) is transmitted every 33ms. Where N is small.
door #4: A cluster of N 30ns pulses spaced 33ms apart is sent every T sec where T >> N * 33msec and N is small.

If it is a cluster then what is the range of N for most guns?
I'm confused.

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[kpatz]

AFAIK all guns emit single pulses. The pulse rate differs from one make of gun to the next; Stalker is 130pps, Ultralyte is 125pps, LA is 238pps etc.

I'm curious as to what the patent said. Maybe it was referring to groups of pulses aka LA Stealth Mode, where it sends 2 pulses, followed by a space of no pulses equivalent timewise to 5 pulses, etc.

[jimbonzzz]

You are looking at FIG. 3 in the Blinder patent. That is only an example that was designed more to convey an aspect of the patent, rather than stay true to typical real-world data.

kpatz is correct: in the case of the Stalker, and most other cases (at least with US guns), your answer is Door#1. Most of the guns have a fixed pulse frequency with evenly-spaced pulses.

There are exceptions though. For example:

- Laser Atlanta Stealth Mode (see GOL website)
- Traffipatrol XR
- Riegl FG-21P
- TruSpeed Euro

Technically, a laser gun could have any waveform/pulsetrain it is designed for.

[apchar]

You're right Jimbonzz, I am reading the blinder patent.
The text talks about determining the jammer frequency, f2, by looking up the received frequency, f1, in a table, where the frequencies described not the 130 Hz pulse rate.
So does this mean there is no lookup table. I thought that was the big advantage of blinders jammers, that they adapt to the transmitter.