MIL-STD-2071A(AS)
3.19 Radar pulse repetition frequency - Also pulse repetition period, pulse repetition interval, and pulse repetition rate. The number of transmitted pulses per unit of the time (seconds), or the time interval between the leading edges of consecutive pulses. This may be stated as pulses per frequency, per second (P/F/S).
3.20 Radar pulsewidth (pulse duration). The time interval between the leading and trailing edges of the transmitted pulse.
3.21 Radar range gate. As applicable to the processing equipment described herein, a number of adjacent range gates are measured in amplitude for each transmitted pulse, normally
15. When the range gate spacing within the processor is set equal to the pulse width of the radar, the range gates can be equated to the resolution-cell as it moves out in range from a reference starting point to a distance of 15 adjacent cell spacings from that starting point.
3.22 Radar resolution-cell (radar cell). A term used to describe the cell volume from which return signals are received. For a pulse radar, the cell volume is defined by the pulse length and the half-power beamwidth (horizontal and vertical angular resolution) of the radar antenna.
3.23 Real time processor. A system providing absolute RCS values while the test run is being made.
3.24 Shielding. Shielding is a condition whereby some of the elements in the chaff cloud are not illuminated by the full power of the radar because other elements nearer to the radar have scattered part or all of the energy out of the beam. The shielded elements are responsible for less measured RCS than an equivalent number of unshielded elements. The degree of shielding can vary from zero, where each element makes maximum contribution to the RCS values, to 100 percent, where some of the elements contribute nothing to the measured RCS values.
3.25 Spectral frequency. The distribution of Doppler frequencies caused by amplitude or cross-section fluctuations (scintillation) of the dipoles within a chaff cloud.
3.26 Tactical air navigation. Equipment installed in aircraft and capable of receiving signals from a ground station for bearing determination and transmitting coded pulses to and receiving return pulses from the ground station for range determination.
3.27 Test activity. The activity designated by the procuring activity to perform the preproduction or production flight tests
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