Help with Missile PD analysis

[Napier (OP)]

Hello, I'm having difficulty determining why one class of ships did so much better than another with point defense against a precursor missile salvo.

After the AMM screen, 31 missiles in 3 groups made it through and my gauss ships of various classes took their turn. All but 1 were knocked out.  All I know about these precursor missiles is that they were size 4 and traveled at 30.1 kps. The 2 classes I'm concerned about are below. The Morale/Grade/Training are maxed out for all involved ships.


4 of these ~55 year old ships in the below class killed 13 missiles with an actual hit rate of 20.6%
Applicable combat log entry: Shots 63 Missile Kills 13 Decoy Hits 0 Overkill 9 Avg CTH 18.2% Hit 20.6% Kill 20.6%

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Liscome Bay I class Light Cruiser      13,229 tons       329 Crew       1,466.1 BP       TCS 265    TH 1,600    EM 0
6047 km/s      Armour 3-49       Shields 0-0       HTK 67      Sensors 5/0/0/0      DCR 8-6      PPV 36
Maint Life 1.63 Years     MSP 554    AFR 175%    IFR 2.4%    1YR 244    5YR 3,667    Max Repair 200 MSP
Commander    Control Rating 1   BRG   
Intended Deployment Time: 12 months    Morale Check Required   

Engine M400 FC.699 S2000 TR100 Nuclear Pulse (4)    Power 1600    Fuel Use 69.88%    Signature 400    Explosion 12%
Fuel Capacity 750,000 Litres    Range 14.6 billion km (27 days at full power)

Gauss Cannon RF3/5 R20 S300 (6x3)    Range 20,000km     TS: 6,047 km/s     Power 0-0     RM 20,000 km    ROF 5       
Beam FC R32 TS6200 S78 EH0 ECCM0 (1)     Max Range: 32,000 km   TS: 6,200 km/s    ECCM-0     69 38 6 0 0 0 0 0 0 0

Sensor Active359k R1 S50 EH0 (1)     GPS 10     Range 4m km    MCR 359k km    Resolution 1
Sensor Active18m5k R100 S50 EH0 ECCM0 (1)     GPS 1000     Range 18.5m km    Resolution 100
Sensor TH17 S50 EH0 (1)     Sensitivity 5     Detect Sig Strength 1000:  17.7m km
And 6 of these 2-3 year old ships in the below class killed 7 missiles with an actual hit rate of 6.3%
Applicable combat log entry: Shots 112 Missile Kills 7 Decoy Hits 0 Overkill 95 Avg CTH 31.8% Hit 6.3% Kill 6.3%
On average, these ships have commanders with better tactical bonuses than the above ships.

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Ticonderoga II class Cruiser      16,504 tons       442 Crew       2,759.6 BP       TCS 330    TH 3,038    EM 0
9202 km/s      Armour 5-57       Shields 0-0       HTK 84      Sensors 6/0/0/0      DCR 12-7      PPV 54
Maint Life 1.61 Years     MSP 1,254    AFR 182%    IFR 2.5%    1YR 562    5YR 8,437    Max Repair 506.3 MSP
Commander    Control Rating 2   BRG   AUX   
Intended Deployment Time: 12 months    Morale Check Required   

Engine M1012 FC.519 S3000 TR100 Ion (3)    Power 3037.5    Fuel Use 51.87%    Signature 1012.5    Explosion 13%
Fuel Capacity 1,105,000 Litres    Range 23.2 billion km (29 days at full power)

Gauss Cannon RF4/5 R30 S300 (9x4)    Range 30,000km     TS: 9,202 km/s     Power 0-0     RM 30,000 km    ROF 5       
Beam FC R44.8 TS9200 S40 EH0 ECCM2 (1)     Max Range: 44,800 km   TS: 9,200 km/s    ECCM-2     78 55 33 11 0 0 0 0 0 0

Sensor Active R16 19.6m800 S75 EH0 ECCM2 (1)     GPS 384     Range 19.7m km    Resolution 16
Sensor Active R1 703k S75 EH0 ECCM2 (1)     GPS 24     Range 7.8m km    MCR 703.6k km    Resolution 1
Sensor TH19 S50 EH0 (1)     Sensitivity 6     Detect Sig Strength 1000:  19.4m km

Electronic Warfare Jammers:   Fire Control 2    Missile 3   

I'm not sure why the 50 year old ships with no EW and slower tracking cannons are hitting far better than my brand new cruisers.  There were 2 other classes of ships involved that also did as poorly as the second group, which were in between the above two in age/tech levels.

[Andrew]

I suspect that the answer in the Overkill figures it looks like the more modern ships hit 7 missiles 102 times, while the earlier group hit 13 missiles 22 times, it is possible that the modern ships engaged last and so only had 8 missiles to shoot at?

[Panopticon]

I agree, it seems that the system doesn't count overkill hits as actual hits.

[Andrew]

Today  I ran a battle with one type of PD ship all missiles were stopped but I only had a 30% hit rate because of the number of overkill shots

[Napier (OP)]

Thank you all. It seems I can continue to trust the CTH estimates. The fire of the oldest ships was listed first in the event log.

I'll have to research FC priorities again and play with them to see if I can get the modern ships to fire first.