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A correction applied to an observed counting rate to allow for the probability of the occurrence of events within the dead time. Also known as coincidence correction.



Related Terms

DERIVATIVE ACTION

Control action in which the speed at which a correction is made depends on how fast the system error is increasing. Also known as derivative compensation; rate action.

SEA-TEMPERATURE DIFFERENCE CORRECTION

A correction due to a difference in the temperature of the sea and air, particularly the sextant altitude correction caused by abnormal terrestrial refraction occurring when there is a nonstandard density lapse rate in the atmosphere due to a difference in the temperature of the water and air at the surface.

SEA-AIR TEMPERATURE DIFFERENCE CORRECTION

A correction due to a difference in the temperature of the sea and air, particularly the sextant altitude correction caused by abnormal terrestrial refraction occur- ring when there is a nonstandard density lapse rate in the atmosphere due to a difference in the temperature of the water and air at the surface.

SALR

Saturated Adiabatic Lapse Rate; the rate at which the temperature of water vapour saturated air changes as it ascends or descends. It is taken as 1.5 degree Celsius per 1000ft.

AIDED TRACKING

A system of radar-tracking a target signal in bearing, elevation, or range, or any combination of these variables, in which the rate of motion of the tracking equipment is machine-controlled in collaboration with an operator so as to minimize tracking error.

FLASHING LIGHT

A navigation light in which the total duration of light in a cycle is shorter than the total duration of darkness. The term is commonly used for a SINGLE-FLASHING LIGHT, a flashing light in which a flash is regularly repeated at a rate of less then 50 flashes per minute.

GUIDANCE STATION EQUIPMENT

The ground-based portion of the missile guidance system necessary to provide guidance during missile flight; it specifically includes the tracking radar, the rate measuring equipment, the data link equipment, and the computer, test, and maintenance equipment integral to these items.

NEWTONIAN FLUID

A fluid with a constant viscosity at a given temperature regardless of the rate of shear. Single-grade oils are Newtonian fluids. Multigrade oils are NON-Newtonian fluids because viscosity varies with shear rate.

PRESSURE GRADIENT

A measure of the rate of change in atmospheric pressure with distance. The closer the isobars are together, the higher the pressure gradient is and the stronger the winds will be.

INSTRUMENT CORRECTION

That correction due to instrument error

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