1. The field distribution, in amplitude and phase, over the antenna physical aperture.
2. The phase and amplitude of the element feed voltages or the distribution of the currents in an array of elements.

The difference between the theoretical gain of a very large antenna, such as the antennas in beyond-the-horizon microwave links, and the gain that can be realized in operation.
Note 1: Aperture-to-medium coupling loss is related to the ratio of the scatter angle to the antenna beamwidth.
Note 2: The "very large antennas" are referred to in wavelengths; thus, this loss… (Read More →)

Applications Programming Interface

Alternative Positioning, Navigation, and Timing

ATIS Point of Deployment (a. k. a. , VueKey)

In an orbit of a satellite orbiting the Earth, the point that is farthest from the gravitational center of the Earth.

See altitude of the apogee or of the perigee.

Abbreviation forapplication, application software.

In alternating-current power transmission and distribution, the product of the rms voltage and amperage.
Note 1: When the applied voltage and the current are in phase with one another, the apparent power is equal to the effective power, i.e., the real power delivered to or consumed by the load. If the current lags or leads the applied voltage, the apparent… (Read More →)

A small, self-contained computer program that usually performs a task as part of, or under the control of, a larger software application. For example, most modern World Wide Web browsers are capable of making use of applets written in the Java programming language to perform simple tasks such as display animations or more complex tasks such as spreadsheet and database… (Read More →)