All,

    The USAK01 contact @133/19:00z was cut short due to the receiver dropping out during the pass. It looks like we were in a bad part of the antenna pattern. The Eb/No was shifting between 12 and 18.5. Normally the difference is closer to 2 to 3 DB. And the receiver was between -118 and -121. At -121 is where we lose lock and the coherent signal returns back to center frequency (Non-Coherent). The duration of the pass is from 19:00 – 1930z.

 

   The spacecraft went thru another BCR Soft reset @133/22:32z. Standing CAR #997 BCR Software Reset Recovery was executed.

Power control was set back to Current

Heater tables – Tank 1 & 2 set points were set back to trip off @18 and trip on @16

CEU 5V was commanded to show on

PCMB was commanded to show on

Gyro was turned back on and accelerometer is the nutation sensor

 

Nominal commanding for the perigee passes:

SSR dump -> Dump New

Reset Master Timer

Set Spacecraft Clock

Reset FDC Totals

CAR # 1037 ATS upload -> IBEX_2019_143_o0448a_v001 93 Cmds

 

The Inertial maneuver was successful

 

Q1 0.05970120 ActNor.EstInrToBdy[0]

Q2 0.58539600 ActNor.EstInrToBdy[1]

Q3 0.64953000 ActNor.EstInrToBdy[2]

Q4 0.48151600 ActNor.EstInrToBdy[3]

GPS sec 1241809809.000 ActNor.EstTime

UTC time 05/13/2019 19:09:55 output

MPS Cmd Vector X 0.637243000

MPS Cmd Vector Y 0.710643000

MPS Cmd Vector Z 0.298175000

MPS Diff 0.729

CSS Angle TLM 0.862981

CSS Sun-Pointing Angle 1.725962

  09 May 19 @ 13:00

CSS Angle TLM 0.609093

CSS Sun-Pointing Angle 1.218186

  13 May 19 @ 19:00

Pre-Burn   

Thruster 1 10736 09 May 19 @ 13:00

Thruster 2 10480

Thruster 3 12992

Thruster 4 13248

Post-Burn  

Thruster 1 11008 13 May 19 @ 19:00

Thruster 2 10752

Thruster 3 13296

Thruster 4 13552

Number of Pulses  

Thruster 1 272

Thruster 2 272

Thruster 3 304

Thruster 4 304

Thruster Pairs  

Thruster 1 & 2 544

Thruster 3 & 4 608

 

 

 

 

Timothy E. Perry

Mission Operations

CRS, IBEX, OCO-2 & TESS

RAPTOR Test Team

timothy.perry@ngc.com

Office (703) 406-5976

Cell (301) 606-1430

 

 
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