Altimeter settings when in Combat?
I have no direct knowledge of latest military satellite capability but the onboard processing capability and downlink bandwidth must be pretty mind-bogglingly expensive if they compete with aircraft systems with onboard storage that can be downloaded on the ground. Probably not a problem for US DoD I suppose.
Out of interest, I've recently been doing some trial flying of a high-resolution 3D oblique camera (UltraCamOsprey) that uses cloud point technology to make 3D images of ground features to within few cm accuracy - definitely has some useful military recon utility. Certainly a lot better than the crappy old 2D Leica images we used to have to plan from!
Out of interest, I've recently been doing some trial flying of a high-resolution 3D oblique camera (UltraCamOsprey) that uses cloud point technology to make 3D images of ground features to within few cm accuracy - definitely has some useful military recon utility. Certainly a lot better than the crappy old 2D Leica images we used to have to plan from!
Trim
Even in the commercial satellite world you can get over 300 mega bits per second (mbps) down a single transponder. So downloading data at that rate wouldn't take long.
LJ
Even in the commercial satellite world you can get over 300 mega bits per second (mbps) down a single transponder. So downloading data at that rate wouldn't take long.
LJ
Leon - yes, I agree you can get high bit rate - but the amount of bits is very large - much higher than even HD video. All the raw images are huge bit-map files, and each image has to have 60-80% forward overlap with its neighbour, and about 30% side lap to get sufficient trigonometric accuracy. Transmitting raw imagery to the ground would be inefficient - presumably there is some automated onboard processing - but without some sort of human control in the loop there must be some degrading of the image quality. As I said, it must all add up to some ferociously expensive data. Also military satellite imagery is usually only something like 40cm/pixel resolution - we fly down to 3cm/pixel, which is approx 1000ft AGL and just a few knots above stall speed to give the camera time to write the image file between shots.
TS,
What's the ball park costs of one of those Osprey Cams?
What's the ball park costs of one of those Osprey Cams?
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STD is used in areas where a Force QNH is not available. If the pressure is above 1013, no problems as you'll always be on the high side. Below 1013 you apply a correction (usually the job of the wingman to work out while you get yourself sorted).
Interestingly in some areas tgt deconfliction is a higher safety concern then enemy action, hence everyone needs to be on the same setting.
Interestingly in some areas tgt deconfliction is a higher safety concern then enemy action, hence everyone needs to be on the same setting.
The same as everyone else around you when actual height above the ground was relatively unimportant and not hitting anyone else was very important.
When IMC, day or night, GPS height would give you a good idea, especially in mountainous terrain. Ally that to TFR, Rad Alt and GPWS and you were pretty well covered.
I guess it's all theatre dependant.
When IMC, day or night, GPS height would give you a good idea, especially in mountainous terrain. Ally that to TFR, Rad Alt and GPWS and you were pretty well covered.
I guess it's all theatre dependant.
Mint with a Hole
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In the UK, if the FJ are being controlled by GCI, they will be passed the lowest QNH for the region they are working. If they are above FL245 in deconflicted airspace, it doesn't matter, they stick to the QNH.
The main reason for not switching to SAS (and I'm sure I will be corrected if I'm wrong), is that obviously everyone needs to be on the same setting, so, in the heat of a fight, you cannot guarantee that all players will switch between QNH/SAS.
In terms of separation against other traffic, GCI will pass the restriction in flight levels above FL245 and let the crews work out the difference. GCI will have also worked out the difference for below 245, but, can advise the crews if it particularly quirky.
The main reason for not switching to SAS (and I'm sure I will be corrected if I'm wrong), is that obviously everyone needs to be on the same setting, so, in the heat of a fight, you cannot guarantee that all players will switch between QNH/SAS.
In terms of separation against other traffic, GCI will pass the restriction in flight levels above FL245 and let the crews work out the difference. GCI will have also worked out the difference for below 245, but, can advise the crews if it particularly quirky.
