IMPORTANT House Rule - Simple Double Blind Rules

Analog double blind rules are kind of a pain in the ass. Here is my homebrew version.

First, let's establish the three types of sensor readings:
Revealed Target (RT) = any unit in LoS or revealed by active sensors (ie. Active Probe).
Unknown Target (UT) = position on map is displayed accurately, but all unit details are hidden
Sensor Ghost (SG) = creates a 12" radius "sensor bubble" where any affected allied unit can "hide" anywhere inside it; enemies will see the bubble, but won't know exactly what is inside. Movement is still calculated based on center of bubble, but speed is limited by slowest unit "using" the bubble. If a hostile gains LoS on center of bubble (effectively "triangulating" sensors), friendly units affected by bubble may immediately "free move" to anywhere inside bubble. After this, the Sensor Ghost is removed and any units that remain outside hostile LoS become UTs for the remainder of the turn. If a unit remains out of LoS until its next movement phase, it may reactivate Sensor Ghost.

Next, let's establish what active probes and ECM suites do:

Active Probe (PRB)
Any unit equipped with a Beagle Active Probe or Clan Active Probe; can fully reveal any unit within 12" and any shutdown/unpowered unit within 8". Unit also gains the Recon (RCN) ability (which is important for tactical command advantages).

ECM (ECM)
Any unit equipped with an ECM suite; can perform any one of the following each movement phase:

• ECM cloak - an AOE "sensor ghost" (12" radius from unit) that hides it and all allies within from passive hostile sensors
• jam active probes/NARC - disable hostile active probes/NARC within 12" of unit
• jam targeting - add a +1 to-hit modifier for all attacks on this unit
• jam comms - disable hostile radio and C3 communications within 12" of unit

NOTE: Angel ECMs work the same as standard ECMs except they can perform TWO functions at once.

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Scenario 1: Both Passive Sensors
Passive Sensor A sees UT up to 24", SG at >24"
Passive Sensor B sees UT up to 24", SG at >24"

Scenario 2: Passive vs Passive w/ECM
Passive Sensor A sees SG at any range not in LoS
Passive w/ECM Sensor B sees UT up to 24", SG at >24"

Scenario 3: Passive vs Active
Passive Sensors A sees UT up to 24", SG at >24"
Active Sensors B sees RT at 12", UT up to 24", SG at >24"

Scenario 4: Passive w/ECM vs Active
Passive w/ECM Sensor A sees UT up to 24", SG at >24"
Active Sensor B sees RT at 12" (unless jammed/disabled by ECM), SG at >12"

Scenario 5: Active w/ECM vs Active
Active w/ECM Sensors A sees RT at 12", UT up to 24", SG at >24"
Active Sensor B sees RT at 12" (unless jammed/disabled by ECM), SG at >12"

NOTE: if an active sensor gets jammed by ECM, unit follows same rules as passive sensors

In summary:
It's less complicated than it looks. With all passive sensors, everything that is not in LoS becomes an Unknown Target within the 24" range and anything beyond 24" is a Sensor Ghost.

If a unit has an ECM and is using the "cloak", it and all allies under its protection become a Sensor Ghost until visually spotted. The one exception to this is any targets within 12" that gets tagged by a working Active Sensor (ie. not jammed by ECM) becomes fully revealed.

If a standard ECM jams the active sensor, the ECM must drop the Sensor Ghost protection and all allies under its cloak become Unknown Targets (assuming they are within 24" of a hostile).

NOTE: Remember, Angel ECM has the advantage of being able to jam active sensors AND keep the Sensor Ghost up.