Which country had the best radar/ Aerial protection system?

[trackend]

Slight side line.
In 1942 Britain suffered a total radar blackout it was at first thought to be a super German jamming device but after investigation it was found to be caused by sunspot activity meaning the sun gave of radio waves this was the start of radio astronomy.

[Guns'n'Props]

To get a really good overview of the development of Radar and electronic warfare try reading "Instruments of Darkness" by Alfred Price (Greenhill 2005).

Essentially by late '44 - 45 the RAF had an impressive repertoire of jamming and deception techniques that could sow utter confusion in the Luftwaffe's night fighting infrastructure. While not totally immune to the German's night defences Bomber Command could deliver massive strikes and keep losses to acceptable levels.

The Japanese also developed some radars for AA fire control which led the B-29s to carry some jammers. Apparently the USAAF were concerned that the radars modified to make the A-bombs explode at 2000 feet could be triggered off prematurely by emissions from Japanese radar.

[parsifal]

My opinion is that the British enjoyed a clear advantage in radar and especially airborne radars. However the germans enjoyed the advantage in passive systems. Its very difficult to say which system was the more successful overall.

The Russians used several thousand complete sets for airfield protection (mostly). These were the latest sets developed and supplied by the Allies.

The Japanese were years behind the west in terms of radar detection. The ship rasrs they were installing in 1944 were a fraction the power of the allied counterparts.