ALP Sensor group firing question. ( Rear Set-Front Set)

[Fletch]

ALP 5 sensor set up.
background for this question.
I have done a bunch of AutoCad drawings that show all the angles of incidence that i may get a alert from, during this process we have overlapped the sensors array/FOV and adjusted the install angles of the sensors specifically to give best protection against the German revenue generator for my specific truck. ( F150 Raptor 4 door)
during this process we found that the best coverage was to have 5 sensors located in different strategic places, one of those locations was in the wing mirror facing forward at an angle of 24 Deg. ( yes, side facing)
During this logical reiterative process the question arouse as to what happens when you get a hit and only one sensor receives the attack.

From a logical POV if the system is labeled such that Front-Rear then i would assume that if any of the single front 3 sensors gets hit then all 3 sensors fire back for security regardless of which one took the initial hit.
However, what happens if we install all 5 sensors at the front and one of the two labeled "rear sensors" receives a hit, will only the "two rear" sensors fire back? ( based in the logic above i would say yes, but i hope im wrong.)

If this is the case then i need to think about which sensors get plugged into which socket based on their physical location on the truck.
If they all fire back regardless then it does not matter which sensor gets plugged into which socket.

J.

[deano]

I had the same problem with my rear 5 sensors (poliscan)

I had front ports mounted on the left side rear all diff angles and my 2 rear ports on the right side rear diff angles

yes all sensors will work together

but I did have some issues while testing with some lidar guns I was picking out the same week points every time seem to happen if I tagged one side only and then panned to the right or vise versa without a new trigger pull on the lidar gun ..so we mixed all the ports around to try and trigger a chain reaction .... once we swapped and mixed ports it was JFG every time

[Fletch]

I had the same problem with my rear 5 sensors (poliscan)

I had front ports mounted on the left side rear all diff angles and my 2 rear ports on the right side rear diff angles

yes all sensors will work together

but I did have some issues while testing with some lidar guns I was picking out the same week points every time seem to happen if I tagged one side only and then panned to the right or vise versa without a new trigger pull on the lidar gun ..so we mixed all the ports around to try and trigger a chain reaction .... once we swapped and mixed ports it was JFG every time

ahh, so what you are saying is your testing then proved that unless both front and rear sensors pick up the same signal then they act interdependently, so in order to combat the possible isolated receives you mixed front and rear ports on the same side in such a way that both front and rear ports receive the same signal at the same time, ish, then all 5 sensors counter attack. ( i think i got you.)

Now i have to rethink all the angles as i need to have them cross over each other due to the extreme angles that Poliscan can perform

Then a future suggestion for this ALP firmware (in another thread at the moment i think) would be to have the ability to select the grouping rather than have them fixed in one group of 3 and another group of 2.

J.

[awj223]

Then a future suggestion for this ALP firmware (in another thread at the moment i think) would be to have the ability to select the grouping rather than have them fixed in one group of 3 and another group of 2.

J.
How else would you do it? There are 5 sensor ports on the ALP. You're not going to go 4/1, because 1 sensor can't jam VPR guns. I guess you could go 5/0 (all sensors together), but other than that, 3/2 is really the only option.

[Clint Eastwood]

Interesting, and this feeds into my speculation on the cable length thing, that the software calculates the time of arrival on each head, and, after calculating the proper counter pulse, it fires each head with appropriate nanosecond offsets, so that gun sees all of the returns in a synchronous manner.

[Fletch]

How else would you do it? There are 5 sensor ports on the ALP. You're not going to go 4/1, because 1 sensor can't jam VPR guns. I guess you could go 5/0 (all sensors together), but other than that, 3/2 is really the only option.

Correct, 5 and 0 in my case, for my front setup.

however, I have two separate ALP systems, one for the front protection and one for the rear, now I know that front and rear groups operate independently ( unless both groups are hit at the same time) I will need to mount one of the 5 sensors, (specifically one in the front group as it has 3 ports in that group) for my rear setups on the front in order to catch reflections from the cars in front so my rear setup is already armed and firing back backwards with the other two in the front group mounted on the back.
You may think this over kill but the issue we have here is the poliscan is setup to shoot from behind and overhead.( slip roads, bridges)

J.

[Fletch]

Interesting, and this feeds into my speculation on the cable length thing, that the software calculates the time of arrival on each head, and, after calculating the proper counter pulse, it fires each head with appropriate nanosecond offsets, so that gun sees all of the returns in a synchronous manner.

Now you have got me thinking, one or possibly two of my cables in my rear setup was/will need to have the extension options fitted, do I need to have all three cables in the same group in the same length?
J.

[Clint Eastwood]

Now you have got me thinking, one or possibly two of my cables in my rear setup was/will need to have the extension options fitted, do I need to have all three cables in the same group in the same length?
J.

According to Tom, this is not the case. Makes sense that the software handles any delta derived from mismatched cable lengths. I assume the CPU 'collects' the time stamps of off-to-on transition of a pulse for each head separately and measures the delta, if any, on reception.

[Fletch]

After testing and confirmation from the factory in the case of the PS hit on any sensor ALL sensors return fire regardless of group.
Just to confirm what I'm saying, if you have 3 sensors on the front and two on the rear and you get a PS hit from the rear then your front sensors will also return fire in sync.
So for those of us who have all 5 sensors facing the same direction it now makes no difference how we arrange the plugs in the control model any more.
I believe that in the past the front and rear systems were separate, but this no longer the case just for a PS attack.
FYI, led red is an attack on the front ports and yellow is an attack on the rear ports, in the case where PS attacks both front and rear ( left and right sides in my case) you get both red and yellow flashing at the same time. ( pro mode)
J.

[winterbrew]

Thanks Fletch - good to know for us afflicted with the Poliscan threat :)

[deano]

thanks fletch

but like my self has 5 sensors on the rear I had front 3 ports left side and rear ports right side all on the rear

on some tests meets I noticed some probloms if I was to aim at the rear right tail light them pan to the left I would get PT as the rear(right heads) heads seen the lidar first looks like the heads that see the lidar first come priority

I had to mix ports around so right become left and left became right to set off a chain reaction so all heads fired together

having front heads on the left and rear ports on the right is ok if the shooter was to be pulling new trigger pulls ..but for those lidar guns that can track no need to pull a new trigger best to mix the ports around

[winterbrew]

Yeah, I'm guessing this is a fairly recent change thats happened in firmware. When we first tested when the ALP came out last year in Oz, it was on the original firmware

Also, it sounds like it will only do this for Poliscan, and not other handheld threats, so unless you've got Poli on your laser tester, will be hard to test for in your driveway etc

[deano]

so if one has 3 heads on the front and 2 heads on the rear so if the lidar hit the front do the rear also fire ?.... and will the other heads fire if it wasn't a new trigger pull ie no space between front and rear alert if one was to have all 5 heads on the rear

we all know the heads fired in sync back last year so whats changed

the only thing I think of that's changed if one was to have 5 on the rear front ports hooked up to left side and rear ports to right side then a lidar threat was to scan one side only say the right side the rear ports will see it first (rightside ) but if this lidar is not broking then scan to the left will the other heads fire

[Fletch]

As im currently only researching PS functionality in detail, i only have the ability to test against PS right now.
All i can tell you right now is 100% sure, for PS only, all sensors return fire all at the same time regardless of which sensor gets hit.

FYI: i have also got them set up as (1,2,3,)-(4,5,) from left to right from the drivers POV so i can tell which side of the road the threat comes from. (Red or yellow and both.)
In our simulations so far regardless of which side of the road the PS unit is set up it is always sensor 3 ( in the middle of the truck) that gets hit first every time.
I have only installed the front setup so far as that is the main threat here in the sand pit and allows me time to get some experience before we do the more complex rear/overhead setup.
It also makes a huge difference which side of the road you drive on with regard to the level of vulnerability, surprisingly the wider the road and the further away you are from the unit the more vulnerable you are due to the PS units ability to deal with extreme angles.
The best side of the road to be on in order to reduce the vulnerability is the same side as the unit set up, you would naturally think that being further away on the other side of the road you would be much safer, NOT TRUE, being further away on the 6th lane dramatically increases your risk due to the PS's ability to deal with angles.

J.