Passive High-speed Projectile Tracker


For sale US patents 8,280,113 and 8,355,536 both titled "Passive Electro-optical Tracker" and IP related to this technology. The technology can be used to track high-speed projectiles and determine their source of fire/target in real-time.

Listing Information

Posted by Waqidi Falicoff under Government Technology

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Passive High-speed Projectile Tracker
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Full Description

LPI spent several years in development of its passive electro-optical technology described in US patents 8,280,113 and 8,355,536.  (Further, work was done which will also be part of the IP transfer to the purchaser of these patents.)  However, LPI now has decided it needs to focus its resources outside of the Defense/Military field which in our opinion favors much larger companies who have well established connections with the US DOD and military. As these patents have not been designated as secret or confidential (they were under review for some time), LPI would also consider a purchase of the patents and IP/knowhow from a company or group that is affiliated with a NATO ally of the US.

Here are some sections from the '113 patent:

One object of the present invention is to make possible a compact, cost-effective passive electro-optical tracker of multiple high-speed objects in a combat environment. The Passive Electro-Optical Munitions Tracker (PET) described in this specification can assist in providing pinpoint 3D information in real time to back-track projectiles to their source of fire.


Fast moving projectiles rapidly heat up by several hundred degrees Kelvin, thereby radiating in the Mid-Infrared (MWIR) region, where electro-optical resolution is far superior even to microwave radars.

The temperature of fast moving projectiles depends directly on their speed. See Ref [1]. According to Wien's displacement law, the spectrum maximum of light emitted by a heated body shifts to shorter wavelengths as the temperature increases. See Ref [4]. The atmosphere has two high transmission windows in the MWIR region, at wavelengths from 3.0 to 4.2 μm and from 4.3 to 5.2 μm. The temperature of an object can be estimated by comparing the irradiance measured by the sensor for that object for these two sub-wavebands. Once this value is determined the speed of the projectile can then be calculated. The instantaneous speed data and array of azimuth and elevation obtained from the electro-optical sensor, together with the calibrated signal levels in each of its pixels, can be used to determine the ballistic trajectory by a proprietary application of the least-square method. This approach can determine the 3D trajectory of projectiles with very high degree of accuracy using passive electro-optical sensors without the need for scanning lidar...

 One objective of the present invention is to make possible a system reaction time short enough to backtrack projectiles and pinpoint the source of the fire to trigger automatic countermeasures, such as laser designation or even counter-sniper fire, before a second enemy shot can be fired. Also, an audible warning to troops in the target zone could allow a second or two of time to simply duck...

 One objective of the present invention is to make possible a passive electro optical system to provide accurate 3D tracking of the actual ballistic trajectories of projectiles, and determine the vital ballistic parameters, such as drag. Based on exterior ballistic laws, it is then possible to provide backward and forward extrapolation beyond the part of the ballistic trajectory directly visible to the tracking system, to locate the source of fire and/or predict the point of impact..


We look forward to finding a buyer that is capable of completing the work started by LPI.