Future AGM-88C HARM behaviour ? - ED Forums
 


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Old 01-14-2019, 09:41 PM   #1
TwojaStara
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Default Future AGM-88C HARM behaviour ?

Hi, does any body know if the unability of HARM to target low band emitters is going to be simulated? As per [1] it should not be capable of targeting below 0.5Ghz (λ=0.59m) - so radars like P-18 (150-170Mhz) should not be targetable by AGM-88C HARM ?

Also second question,in case of emitter ceasing to transmit, is HARM in DCS going to have chance to miss or not ? According to [2], HARM C (Block III/IIIA/IV/V) variant should miss as it doesn't have GPS receiver ? (only -D gets the GPS):

Quote:
The main improvement of HARM Block VI is the incorporation of a GPS navigation system. This greatly increases accuracy when radar lock is lost after emitter switch-off, because the GPS guidance keeps the missile within a narrow box towards the last known emitter position. This is especially desirable in wars, where enemy radar installations are deliberately placed near sensitive civilian areas, like schools or hospitals. This often prevented the use of earlier HARM missiles in the Kosovo campaign, because a deviation after radar loss could lead to unacceptable collateral damage.
In case the HARM will still get accurately to the old emitting location (even with emission off; let's assume simplification for DCS ), would it miss if the target would be on the move ? (e.g. Osa/Tunguska/Tor?)

[1] - http://www.ausairpower.net/API-AGM-88-HARM.html
[2] - http://www.designation-systems.net/dusrm/m-88.html
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Old 01-15-2019, 06:51 AM   #2
Frederf
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Non-GPS HARM still attempt to hit with IMU memory but Pk is significantly lower because IMU coasting without radiation homing is only so good. GPS-INS models are much superior and can be used to hit radars reliably which have shut down mid-engagement and even target radars which never turn on during engagement (if provided target data is sufficiently accurate). Naturally moving radars are not hit by either type.

C model contains originally Block IV software (later V) however and does not have GPS or HOJ capability. A C with VI is a D model.
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Old 01-16-2019, 07:56 PM   #3
TwojaStara
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Ok, I've tested it today with our new shiny Hornet HARMs:
a) we cannot target on EWRs which is good
b) 4/4 times I was able to force HARM (launched at edge of S-75 range , from 33k feet) to miss by disabling radar emission of whole S-75 sam site (from template) - by going into Combined Arms Tactical commander mode, This makes it even better fun when it's done automatically by IADSScript: if anyone is interested: https://forums.eagle.ru/showthread.php?t=118175
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Old 01-16-2019, 09:25 PM   #4
Anklebiter
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Cool! Were they hitting consistently when you left the site on at that range?
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Old 01-18-2019, 06:13 PM   #5
TwojaStara
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Quote:
Originally Posted by Anklebiter View Post
Cool! Were they hitting consistently when you left the site on at that range?
They were hitting like 2-3 out of 4 when I was not shutting down SAM.


When I was in charge of SAM and disabled radio emissions all of them missed.
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Old 01-18-2019, 07:42 PM   #6
Blaze1
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Quote:
Originally Posted by Frederf View Post
Non-GPS HARM still attempt to hit with IMU memory but Pk is significantly lower because IMU coasting without radiation homing is only so good. GPS-INS models are much superior and can be used to hit radars reliably which have shut down mid-engagement and even target radars which never turn on during engagement (if provided target data is sufficiently accurate). Naturally moving radars are not hit by either type.

C model contains originally Block IV software (later V) however and does not have GPS or HOJ capability. A C with VI is a D model.
Good post Frederf. The bold part of your statement is of course pretty critical.
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Old 01-18-2019, 08:08 PM   #7
delevero
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Thought you guys might find this usefull.


Harm
distance altitude speed
70nm 40.000ft 380
50nm 30.000ft 400
35nm 20.000ft 400
25nm 10.000ft 400
15nm 1.000ft 550

Last edited by delevero; 01-18-2019 at 08:11 PM.
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