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Beyond visual range Artillary

The Beyond-visual-range artillery (BVR) system has 5 shooting modes and 2 ammunition modes, as well as 2 trajectory modes. This model is of the horizontal fixed-axis type, and the 5 shooting modes are determined by the combination of three independent levers.

- Digital/Directional Lever: When not pulled down, corresponds to Digital mode.
- VR/BVR Lever: When not pulled down, corresponds to VR mode.
- Auto/Manual Lever: When not pulled down, corresponds to Auto mode.

• Mode 1 Line-of-sight control within visual range (Any/VR/Any) :
  Classic periscope control, commonly used under normal circumstances.
  
  
• Mode 2 Automatic digital control outside visual range (Digital/BVR/Auto) :
  Based on relative positions between periscope-controlled distance-measuring drone and artillery, fire angle automatically controlled by the ballistic calculator.
  
  
• Mode 3 Manual digital control outside visual range (Digital/BVR/Manual) :
  Based on manually input x-coordinate, fire angle automatically controlled by the ballistic calculator.
  
  
• Mode 4 Automatic directional control outside visual range (Directional/BVR/Auto) :
  Controlled based on real-time navigation angle vector from gun control terminal.
  
  
• Mode 5 Manual directional control outside visual range (Directional/BVR/Manual) :
  Controlled based on manually input fire angle.

The trajectory mode lever is equipped with a trajectory light: Indirect/Direct. It corresponds to the indirect trajectory mode when not pulled down (0°< Direct < 35° < Indirect < 70°).

The lever 'Regular/Advanced Ammo' corresponds to 'Regular Ammo' when not pulled down. Available ammunition types:

• Regular Ammo : Railgun shell
  
• Advanced Ammo : Physicorium Shell, nuclear shell

If the large turret be switched, the ballistic formula for the ammunition mode needs to be modified by changing the corresponding coefficients below.

- First Order: 11.3013471124
- Second Order: -0.3340109313
- Third Order: 0.0040868611
- Fourth Order: -0.0000215902
- Constant: 47.5549957978

- First Order: 11.4328896702
- Second Order: -0.2858201239
- Third Order: 0.0028176969
- Fourth Order: -0.0000127468
- Constant: 36.5975270154

- First Order: 11.6121758282
- Second Order: -0.2816361723
- Third Order: 0.0026907976
- Fourth Order: -0.0000120350
- Constant: 33.4871800506

The cannonball has an innate spread of 8° upon firing and lower ammunition density, making it unsuitable for long-range precision sniping but useful for cost-effective long-range firepower coverage. Railgun ammunition does not have a spread issue and has high ammunition density, making it particularly suitable for long-range sniping potential targets.

This model is of the horizontal fixed-axis type, so the ballistic formula is precise only when the cannon and the target are at the same depth. In automatic digital control mode beyond visual range, the safety will be enabled when Δy < 5m and Δx < 0.3m. The current safety status is visually indicated by the red/green lights on the fire control terminal: Red - Firing disabled, Green - Firing allowed.