That point at which a planet, planetoid, or comet crosses the ecliptic from south to north, or a satellite crosses the plane of the equator of its primary from south to north. Also called NORTHBOUND NODE. The opposite is called DESCENDING NODE


Related Terms

HURRICANE TRACKING

Recording of the movement of individual hurricanes by means of airplane sightings and satellite photography.

HORIZON SENSOR

A passive infrared device that detects the thermal discontinuity between the earth and space; used in establishing a stable vertical reference for control of the attitude or orientation of a missile or satellite in space.

INJECTION MESSAGES

Messages periodically transmitted to artificial satellites for storage in satellite memory

INTERFEROMETER

An apparatus used to produce and measure interfer- ence from two or more coherent wave trains from the same source. Used to measure wavelengths, to measure angular width of sources, to determine the angular position of sources (as in satellite track- ing), and for other purposes.

INTERMEDIATE ORBIT

A central force orbit that is tangent to the real (or disturbed) orbit at some point. A fictitious satellite traveling in the intermediate orbit would have the same position, but not the same velocity, as the real satellite at the point of tangency

IONOSPHERIC CORRECTION

A correction for ionospheric refraction, a major potential source of error in all satellite radionavigation systems. Navigation errors can result from the effect of refraction on the measuremen

L-1 SIGNAL

The primary L-band signal transmitted by each GPS satellite at 1572.42 MHz. It is modulate

GLOBAL POSITIONING SYSTEM

A satellite based radionavigation system providing continuous worldwide coverage. It provides navigation, position, and timing information to air, marine, and land users.

LINE OF NODES

The straight line connecting the two points of intersection of the orbit of a planet, planetoid, or comet and the ecliptic; or the line of intersection of the planes of the orbits of a satellite and the equator of its primary.

ALERT TIME CALCULATIONS

Computations of times and-altitudes of available satellite passes in a given period of time at a given location, based on orbital data transmitted from satellite memory. Sometimes called ALERT.

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