Coherent Processing Interval
Encyclopedia
A Coherent Processing Interval (CPI), in radar
systems, indicates a group of multiple pulse
s, usually with the same PRF
and frequency
. A CPI will generally consist of one or more coherently integrated pulses, and possibly 1 or more fill pulse
s. PRF and frequency are sometimes changed between CPIs or groups of CPIs.
Radar
Radar is an object-detection system which uses radio waves to determine the range, altitude, direction, or speed of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. The radar dish or antenna transmits pulses of radio...
systems, indicates a group of multiple pulse
Pulse (signal processing)
In signal processing, the term pulse has the following meanings:#A rapid, transient change in the amplitude of a signal from a baseline value to a higher or lower value, followed by a rapid return to the baseline value....
s, usually with the same PRF
Pulse repetition frequency
Pulse repetition frequency or Pulse repetition rate is the number of pulses per time unit . It is a measure or specification mostly used within various technical disciplines Pulse repetition frequency (PRF) or Pulse repetition rate (PRR) is the number of pulses per time unit (e.g. Seconds). It...
and frequency
Frequency
Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency.The period is the duration of one cycle in a repeating event, so the period is the reciprocal of the frequency...
. A CPI will generally consist of one or more coherently integrated pulses, and possibly 1 or more fill pulse
Fill pulse
Fill pulse is a term used in radar systems, to indicate one or more pulses transmitted by the radar, for the express purpose of "filling in range". It serves no other purpose than to push out the range at which folded clutter is seen by the radar...
s. PRF and frequency are sometimes changed between CPIs or groups of CPIs.