MIL-STD-469B
3.1.7 Rectangular aperture array. A rectangular aperture is defined as the shape of the arra y configuration of a planar-array antenna in which the elements are located within a rectangular area.
3.1.8 Selectivity. Selectivity is a measure of a receiver's ability to discriminate against signals o n adjacent frequencies (usually expressed as a curve in which the input signa l power at an adjacent frequency, relative to the on-tune power that produces the same response, is plotted against frequency).
3.1.9 Sensitivity. Sensitivity is the minimum input signal required to produce an output signal o r indication that satisfies a specified requirement.
3.1.10 Signal processor. Signal processor is a device that processes the output signal of a receiver to utilize the information contained in the signal for such purposes as supplying tracking error signals , complex waveform decoding, automatic gain control (AGC) for its syst ems, target identification, electronic counter-countermeasures (ECCM), and clutter mapping.
3.1.11 Signal substitution. Signal substitution is a method of measuring signals by using a calibrated signal generator whose output is similar to that of the unknown signal and substitutes for the unknow n signal to produce an identical response.
3.1.12 Spacebased radiolocation system, class 1. Spacebased radiolocation system, class 1, is a radiolocation system in spac e, the primary function of which is the detection and location of objects on or near the surface of the earth.
3.1.13 Spacebased radiolocation system, class 2. Spacebased radiolocation system, class 2, is a radiolocation system installed aboard a spacecraft for the purpose of determining the relative positions or velocities of one or more extravehicular objects.
3.1.14 Spurious emission, inband. A spurious emission inband is any spurious emission of a transmitter or system that is within the assigned frequency tuning range for the system.
3.1.15 Standard response. Standard response is a repeatable indication of radar operationa l performance (as specified in the radar system procurement specification) that is accessible through th e receiver or signal processor for use in measurement of receiver selectivity or sensitivity.
3.1.16 Standard test frequencies. Standard test frequencies are that set of frequencies to whic h transmitters or receivers are tuned during the test procedures. At least three such frequencies exist in the tuning band designated for each equipment are located at the lower limit, center, and upper limit of th e tuning range in each band, and designated to l ow (FL), mean (FM), and high (FH), standard test frequencies, respectively.
3.1.17 Transmitter. A transmitter is equipment needed to generate a modulated RF signal and feed the modulated signal to an antenna for radiation into space as electromagnetic waves.
3.1.18 Tunability. Tunability is the ability of a radar system to perform its specified acquisition or tracking functions or both by maintaining adequate transmitter power output and receiver sensitivity over the designated tuning range.
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