Conventional ships and missiles are vulnerable to detection by electromagnetic field sensor arrays because their chassis, electronics and other components carry EM flux differently from space. Any conductive material will induce current when a EM field passes through it. Also, any current carrying conductors generate EM flux of their own. Together, these allow external detection system to find the object, as well as details about its internal composition.
These detection systems can work in two possible ways - active and passive. Passive scanning systems operate by detecting any flux generated by electronic circuits and other electronic devices (like valves, motors, etc). This system allows the detection system to find targets and components without sending out any signals. Active scanning systems work by generating an EM field and observing the returned signal. Using the feedback from the field generators, it can measure the inductive response of objects - allowing them to obtain more details than passive systems can.
The ETS system uses two sub-systems to shield the object from these two forms of detection from EM sensor systems. One system evades passive scanning systems and the other evades any active systems. Together, these two systems eliminate any chance of detection with an EM type detection array.
The passive evasion system is simply one or more superconductive induction coil(s) surrounding the core of the object. As all inductive coils work, the coil will generate a current to in turn generate a flux to cancel out the internal flux. Since superconductive coils have zero resistance, this current will be the right amount to cancel out all of the EM flux generated by the core. This coil may also be connected to a recharging system to use this energy to recharge the power storage system onboard for longer run times. Using this system the ship or missile will emit no EM flux and make it invisible to any passive detection systems.
The active evasion system is more complicated. It consists of an array of coils lining the outside of the inner induction coils. Similar to the inner induction coils, these are superconductive coils. Each of the coils is wired to the coil on the opposite side of the object. This completes any electromagnetic field lines passing through the object with no transformation of the signal. Since all active EM fields pass through the object unchanged, the sensor system is enable to detect any difference between the object and the space it exists in. This current is run through an isolated and well shielded amplifier circuit. The coil on the opposite time is provided with the identical current induced on the receiving coil. The remainder of the current is run into a processing array. This allows these coils to act as ultra sensitive passive scanning system - allowing the object to remain invisible, but still be able to detect external EM flux.
The active evasion system may also be attached to an IC signal generator. These signal generators are capable of emulating the EM signature of any object desired. This allows missiles or signal buoys to emulate large ships, or large ships to emulate cargo ships, fighters, etc. This system can also be used to shield non-stealth objects behind it. This capability would allow a few stealth objects to confuse the sensors of an enemy vessel for an entire fleet.
With the proper combination of these systems, no EM detection systems could possibly detect any object hidden by them. Combining these systems with others would eliminate the possibility of detection by any system. Using stealth technologies, missiles could hit targets before they even know they are being shot at, ships and fighters could do surveillance on enemy installations or track enemy fleets.
This system uses concepts so simple that it could have been easily implemented using 20th century technology. Since vacuums offer no means of heat transfer, the superconductors used in the coils would not necessarily need to be room temperature. They could easily maintain extremely low temperatures for proper superconductive behaviour. Since technology has come a long way since then, these superconductors are much more tolerant to varying temperature levels. A superconducting induction coil in a vacuum will operate as a perfect ideal induction coil, absorbing all EM flux.