WolfhoundCH Posted March 16, 2021 Posted March 16, 2021 Current open Beta version, in the screenshots I'm in TWS, picture 1 is a closure rate of 1088Kts, picture 2 is 801Kts. According to the DDD-Picture I shared, in Target aspect "beam", the lines all the way to the right of the DDD should be 200Kts apart, so I would expect to see at least that amount of difference between the two screenshots, but they're pretty much the same. Same issue in PD Srch but ofc harder to prove as I don't have a second source to show closure rate.
WolfhoundCH Posted March 23, 2021 Author Posted March 23, 2021 (edited) Resolved with this, misunderstanding: The DDD in the pulse doppler search modes displays returns at azimuth versus rate (closing speed) meaning that by reading only the DDD the RIO can only discern target closing speed and azimuth. The display indicates observed closure rate vs the ground (with own airspeed subtracted) as opposed to relative closure rate. While this means that a target directly ahead, moving directly towards the radar, will show true target airspeed this speed varies with target aspect and radar antenna azimuth. This reason for this is that the radar itself only reads relative airspeed which is then modified by subtracting own airspeed for display on the DDD. Edited March 23, 2021 by Eteokles
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