NPOESS P3I & Follow-on Threshold Operational Mission

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NPOESS P3I & Follow-on Threshold Operational Mission Point Design Performance Plots Using The Doppler Lidar Simulation Model (DLSM) Simpson Weather Associates

Parameter Demo Threshold Objective Direct Detection Subsystem Parameter Demo Threshold Objective Energy per pulse (at 1.06 microns) .75J Prf 100Hz Conversion efficiency .45 Wallplug efficeincy .042 T/R Optical throughput (pre receiver/detector) .36 Detector QE .6 Beam split fraction .4 Filter through put .17 Edge sensitivity .0075 Telescope diameter .75m Integration time 12s 6s

Parameter Demo Threshold Objective Coherent Detection Subsystem Parameter Demo Threshold Objective Energy per pulse .25J Prf 5 Hz 10 Hz Wallplug efficeincy .014 T/R Optical throughput (pre receiver/detector) .55 Mixing efficiency .42 Detector QE .8 Telescope diameter .25m Integration time 12s 6s

Reference Performance Profile

833 km Demo Mission Direct Molecular (Background Aerosol) Direct Molecular (Enhanced Aerosol) Coherent (Background Aerosol) Coherent (Enhanced Aerosol) At a planned 10% duty cycle, the orbit average for the Direct Molecular system is estimated to be 250 watts Note

400 km Threshold Mission (30 degree nadir) Direct Molecular (Background Aerosol) Direct Molecular (Enhanced Aerosol) Coherent (Enhanced Aerosol) Coherent (Background Aerosol) Note At a planned 10% duty cycle, the orbit average for the Direct Molecular system is estimated to be 250 watts

400 km Threshold Mission (45 degree nadir)

Space Wind Measurement Requirements - 1 Demo Threshold Objective Vertical depth of regard (DOR) 0-20 0-30 km Vertical resolution: Tropopause to top of DOR Top of BL to tropopause (~12 km) Surface to top of BL (~2 km) Not Req. 2 1 0.5 0.25 Number of collocated LOS wind measurements for horizA wind calculation 2 = pair - Horizontal resolutionA 350 100 Number of horizontalA wind tracksB 4 12 Velocity errorC Above BL In BL 3 m/s Minimum wind measurement success rate 50 % Temporal resolution (N/A for single S/C) N/A 6 hours Data product latency 2.75 A – Horizontal winds are not actually calculated; rather two LOS winds with appropriate angle spacing and collocation are measured for an “effective” horizontal wind measurement. The two LOS winds are reported to the user. B – The 4 cross-track measurements do not have to occur at the same along-track coordinate; staggering is OK. C – Error = 1s LOS wind random error, projected to a horizontal plane; from all lidar, geometry, pointing, atmosphere, signal processing, and sampling effects. The true wind is defined as the linear average, over a 100 x 100 km box centered on the LOS wind location, of the true 3-D wind projected onto the lidar beam direction provided with the data. (original errata that have been corrected) = meet or exceed = TBD

Issues for ISAL/IMDC What subsystems can be shared? What is the standby power requirement for the DD system? What are the scanner power requirements? Peak and average draw?