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ExNusquam -> RE: The Chinese maritime surveillance system (1/7/2017 3:52:09 PM)
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ORIGINAL: gosnold
Another interesting question is: could Gaofen-4 detect aircrafts on afterburner (likely yes, american DSP satellites can do it and they have a 1km resolution), or even standard jet engines (maybe).
Theoretically, but we don't know the exact sensor design of the GF-4, so it might be of much use tracking aircraft.
DSP is a non-imaging scanning sensor that checks it's FOR every 10-seconds. This is great for missile warning across an entire AOR. The GF-4 sensor is probably analogous to the SBIRS-GEO Staring sensor. From a US OSD Report:
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The GEO staring sensor will have high agility to rapidly stare at one earth location and then step to other locations,with improved sensitivity compared to DSP. Several areas can be monitored by the staring sensor with revisit times significantly smaller that that of DSP. A continuous staring mode will also provide an even smaller revisit time.
These sensors are probably more useful in the Technical Intelligence/Battlespace Characterization roles than an Indications and Warning (IW) role. If China launches a scanning sensor to tip-and-cue the GF-4 onto events, I think the IR sensor will become far more useful. That would allow the scanner to detect the event and the starer to characterize/track it. Currently I think it's used to supplant the EO sensor during night hours.
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