Used to work in missile defense at LM as a Systems Engineer, and seen similar estimations done for cost, schedule, LOC, FTEs, etc.
To get to the total 1.5M LOC, it's after decomposing the system into lower level black boxes and doing some modeling/simulation.
How many lines of code has it taken in the past to build our navigation systems, radios, weapon system A, weapon system B, etc. How much integration work is there? If its a CAN bus, the last project had X LOC for the bus architecture.
Add em up, and add a big fudging factor.
To get to the total 1.5M LOC, it's after decomposing the system into lower level black boxes and doing some modeling/simulation.
How many lines of code has it taken in the past to build our navigation systems, radios, weapon system A, weapon system B, etc. How much integration work is there? If its a CAN bus, the last project had X LOC for the bus architecture. Add em up, and add a big fudging factor.