There will be pretty major upgrades for processing power, memory system, displays and sensors along with software to take advantage of all those HW upgrades. 25 times the processing power and huge increase in memory (Terabytes instead of Megabytes). That will give insane boost for all capabilities for all sensors and sensor fusion system. Memory is especially important as amounts of data those systems generate and handle are astounding. Like the "Big SAR" definitely needs huge amount of memory to handle the amount of data. For example with 10 cm resolution and 8 bit samples, one square kilometer will take about 100 Megabits. In real life it might be more as modern systems tend to use 12 or even 14 bit sampling for higher quality imaging. So capturing SAR images from larger areas could easily take several Gigabytes each.
Like popcorn post here:
viewtopic.php?f=62&t=53205&p=370615&hilit=+f35+pentagon+harris+lockheed.aspx+#p370615The new hardware and software technology, to be operational on the F-35 by 2021, includes seven racks per aircraft consisting of 1,500 module components, including new antennas and weapons release systems.
Some of the components include an Advanced Memory System (AMS) engineered to improve data storage and generate higher resolution imagery to help pilots with navigational and targeting information.
“Instead of having to measure something in megabits or megabytes, we are now talking about terabytes,” Truesdell said.
The upgrades include a portable memory device which can quickly be transferred from a ground station to the F-35 cockpit.
The new avionics are intended to enhance the F-35’s sensor fusion so that information from disparate sensor systems can be combined on a single screen for pilots to lower the cognitive burden and quicken the decision-making process. New modules for mission systems will integrate into the F-35s Distributed Aperture System sensors and Electro-optical Targeting System.
Faster processers will also improve F-35 delivery of weapons enabled by the latest 3F software drop, such as the AIM-9X air-to-air missile. Improved radar warning receiver technology will more quickly identify enemy aircraft and integrate with the aircraft’s mission data files, or threat library.
I think Block 4 will give really big improvement over current and already incredibly capable avionics system. This is something like upgrading a 15-year old laptop or smart phone to a modern one. New one will feel familiar, but have far better features and capabilties.