Editing Infrared homing (section)

===Rosette seekers===
The ''rosette seeker'', also known as a ''pseudoimager'', uses much of the mechanical layout of the con-scan system, but adds another mirror or prism to create a more complex pattern, drawing out a [[Rose (mathematics)|rosette]].<ref name="Strickland-2012">{{cite book |first=Jeffrey |last=Strickland |title=Missile Flight Simulation |publisher=Lulu |date= 2012 |pages=21–22}}</ref> Compared to the fixed angle of the con-scan, the rosette pattern causes the image to scan to greater angles. Sensors on the drive shafts are fed to a mixer that produces a sample FM signal. Mixing this signal with the one from the seeker removes the motion, producing an output signal identical to that from the con-scan. A major advantage is that the rosette seeker scans out a wider portion of the sky, making it much more difficult for the target to move out of the field of view.{{sfn|Deuerle|2003|p=2407}}

The downside to the rosette scan is that it produces a very complex output. Objects within the seeker's FOV produce completely separate signals as it scans around the sky; the system might see the target, flares, the sun and the ground at different times. In order to process this information and extract the target, the individual signals are sent into a [[computer memory]]. Over the period of the complete scan this produces a 2D image, which gives it the name pseudo imager.{{sfn|Deuerle|2003|p=2407}} Although this makes the system more complex, the resulting image offers much more information. Flares can be recognized and rejected by their small size, clouds for their larger size, etc.<ref name="Strickland-2012"/>