so guys i am giving several images and disscussion if any body here understands what the below pic by lockhead says do explain it to me ,becoz i am still hazy about what is the difference
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i am also posting a description given by a user on f16.net forum (i found it to be best explanation)
"This is my understanding regarding sensor fusion implementations in 4++ gen fighters and 5th gen fighters. AFAIK, all 4++ gen fighters have very similar fusion implementations in principle but exact details might of course be quite different.
First difference is that 4++ gen sensor fusion is what is called track correlation. This means every sensor has to first create a track and then track information is sent to sensor fusion engine where different tracks are correlated and a single track is created by the fusion engine. For example target range might be taken from radar track, angular information (elevation, azimuth) from IRST track and ID information combined from radar (radar NCTR methods) and RWR (radar emissions from target direction) tracks. In 5th gen fighters (at least in F-22 and F-35) the sensors don't create their own tracks at all but rather all the sensor data is fed to sensor fusion engine. Thus sensor fusion engine has access to all the information the sensors generate. Sensor fusion creates a single track from all that data and can use data from sensors that is unavailable in track correlation systems. For example radar (or IRST system) might get infrequent detections which would not be enough to generate or maintain a track. It also generates more information from targets in shorter time as there as time is not wasted in generating tracks with every sensor before sensor fusion gets to work. Downside of 5th gen sensor fusion is that it requires much better network inside the aircraft (from sensors to fusion engine computer) and much more computing power to crunch the data in real time.
Second main difference is that 5th gen sensor fusion is much more autonomous and can truly automatically cue and task all the sensors. This lowers pilot workload and improves situational awareness a lot in complex situations. It also shortens reaction time a lot and can actually do sensor fusion against much larger number of simultaneous targets. For example if RWR detects something in 3 different directions simultaneously, sensor fusion engine can command radar, IRST and IFF systems to probe for more information in very quick order. In 4++ gen systems the RWR would first have to get more information before giving info to pilot who might then have to control all the sensors to do the same. This would take a lot more time and the situation might change drastically during that time.
Third difference is what data can be used for sensor fusion. In 4++ gen systems the sensor fusion uses only data which has been got from sensors (data link is basically a sensor). In 5th gen systems the sensor fusion can (potentially) use much more diverse set of information. It might be able to use things like threat image and dimension data, geographical and spatial data (terrain features, buildings), ATO&ACO level info, weather data etc. It's basically just a matter of having information sources available and software to factor in the information. I doubt all this is currently done or even planned yet. IMO, F-35 sensor fusion in 2045 will have vastly more capabilities than it currently does.
Basically F-35 sensor fusion does things much faster, much more automatically and against many more targets than 4++ gen sensor fusion. That's the reason for the "God's eye of the battlefield" quotes regarding it."