LASER RANGE PREDICTION (LRP)

LEARNING OBJECTIVES: Interpret LRP displays for low-level laser radiation. Identify limitations and assumptions.

The LRP displays range information for exposures to low-level laser radiation, both height vs. range and by differences between day and night conditions. The program also displays range vs. time of exposure for different levels of exposure to laser radiation.

LRP produces ranges for exposures to laser radiation that could be hazardous to aircraft pilots or crewmembers in the line of sight of this radiation.

The restrictions as well as the principles taken for granted in using the LRP program are as follows:

. This program operates on a wavelength-specified basis. If the operator selects a wavelength that is available to the program, then the closest wavelength will be run for calculations.

. The power is the averaged power for a pulsed laser that pulses over a l-second period. Data-base computations select the pulse repetition frequency for maximum power of a particular radar.

. No power increase is taken into account in the calculations for the displays due to magnification effects (for example, binoculars).

. The vertical extent of the transmission models is 7 km in height for gaseous components and 2 km for aerosol components in the selected environment. This limits surface-to-surface results and possible outputs to other displays.

. The Night/Day display assumes one set of eye apertures for the night/twilight/day exposures.

. This program is not to be applied to air-to-air cases since the variation of the atmosphere with height will effectively change the resultant ranges.

The operator specifies a set of laser parameters or selects a laser from the laser database. The atmosphere and environment are then specified by the operator. Output from this program is classified and should be labeled as required.

BALLISTICS WINDS AND DENSITIES CORRECTIONS (BALWND)

LEARNING OBJECTIVES Interpret BALWND correction factors for U.S. and NATO gunfire support. Identify limitations and assumptions. List the types of forecast messages produced by the BALWND program. The BALWND program computes ballistic wind and density correction factors for U.S. Navy and North Atlantic Treaty Organization (NATO) gunfire support. Correction factors are produced for the following types of gunfire: surface-to-surface <16-inch, surface-to-air >16-inch, surface-to-surface 16-inch full charge, and surface-to-surface 16-inch reduced full charge.

Ballistic wind and density correction factors are output in standard U.S. Navy and NATO ballistic message format. User-specified input includes the duration of the ballistic forecast and a specification of the radiosonde data set to be used. The user-specified radiosonde data set is retrieved from the EDFs and contains the upper air and upper wind profiles necessary to produce a ballistic wind and density forecast.

Ballistic correction factors are used by gunfire support personnel to correct for current or forecast atmospheric conditions. These correction factors are required to obtain close hits with initial firings of naval guns.

The restrictions as well as the principles taken for granted in using the BALWND program areas follows:

. This program requires that the user-selected radiosonde data set contain an upper wind profile.

. Care must be taken that a radiosonde data set representative of the area where naval gunfire is to take place is selected

. Ballistic wind and density correction factors are output only to the ballistic zone through which a complete set of environmental data is available.

All output from the BALWND program is classified and should be labeled as required, The program consists of the following messages:

. NATO surface-to-surface ballistic forecast message.

. U.S. Navy ballistic forecast surface-to-air <16-inch gunfire.

. U.S. Navy ballistic forecast message for surface-to-surface 16-inch reduced-charge gunfire.

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