PRECEDENCE ACTION/ROUTINE INFO/ROUTINE FROM MPSETD RELEASER: A SHORT (SIGNED) TO LRID/STADIR/STAOPS INFO JGTS/STADIR/STAOPS ANBE/STADIR/STAOPS JLSR/SHIP-REC/S BAUGH JOCC/CCOSPVR/OPSSVR/OPSCHF/MGNTRK/NATTRK/S BETHEL(NDC) JFTL/OEASCOE/OEAOPS/MPMULTI/SYSRS/SYSTRK JMCT/MGN ACE/J M STEWART/W HENRY/D DOODY/R LOCK DLD/A BERMAN/J HODDER/G WINN/J COVATE/A SALAZAR/S ASMAR/R HORTON SUBJECT: BISTATIC RADAR QUASI-SPECULAR EXPERIMENT AT DSS63. PURPOSE: TO BRIEF THE STATION ON THE QUASI-SPECULAR EXPERIMENT ACTIVITIES AND CONFIGURATION INFORMATION: ON DOY 156 (1135-2115) MGN PROJECT WILL CONDUCT A BISTATIC RADAR QUASI-SPECULAR EXPERIMENT. THE S/C WILL BE POINTED TOWARD A SPECIFIC TARGET ON THE VENUSIAN SURFACE (MAXWELL MONTES, THE LARGEST MOUNTAIN RANGE ON THE PLANET)AND THE X- AND S-BAND SIGNALS WILL BE REFLECTED OFF OF THIS TARGET. THE DSS WILL USE THE OPEN LOOP RCVR AND DSP TO CAPTURE AND RECORD THE REFLECTED SIGNALS. THE EXPERIMENT WILL ENCOMPASS 6 ORBITS AND USE 2 DIFFERENT CONFIGURATIONS. THE CONFIGURATIONS ARE AS FOLLOWS: CONFIGURATION 1 = SB ONLY (ORBITS #1, #3, AND #5 SRCP AND SLCP) CONFIGURATION 2 = XB ONLY (ORBIT #2, #4, AND #6 XRCP AND XLCP) THE EXPERIMENT WILL BEGIN WITH CONFIGURATION 1. AMBIENT LOAD CALIBRATIONS SHOULD BE PERFORMED ON EACH CHANNEL AS FOLLOWS: 1) USE DSP CONFIGURATION 1. ENABLE ALL DSP AND SSI MONITOR DATA TO JPL. NOTIFY TRAKON WHEN READY TO BEGIN. 2) AT THE LMC ENTER "RS RUN". 3) AT THE ANTENNA CONTROL, SWITCH THE ANTENNA TO AMBIENT LOAD. 4) NOTE THE PHYSICAL TEMPERATURE OF THE AMBIENT LOAD FROM THE AND NOTE THE TIME. 5) ADJUST THE RIV ATTENUATION TO SHOW 1 VOLT RMS. 6) NOTE THE ATTENUATOR VALUE FROM STEP 5 ALONG WITH THE TIME. REPORT THE PHYSICAL TEMPERATURE OF THE AMBIENT LOAD, THE ATTENUATOR VALUE AND THE TIME TO TRAKON. LEAVE THE SYSTEM IN THIS CONFIGURATION FOR TWO MINUTES. 7) AT THE ANTENNA CONTROL, SWITCH THE ANTENNA TO COLD SKY. 8) REPEAT STEPS 5 AND 6. 9) WHEN COMPLETED WITH BOTH CHANNELS, IDLE THE DSP AND MARK THE TAPES USED AS "PRECAL". CONFIRM THAT ALL ATTENUATORS ARE SET FOR APPROXIMATELY 1 VOLT RMS ON COLD SKY BEFORE GOING TO POINT. EXPECT ATTENUATOR SETTINGS OF APPROXIMATELY 39 AND 39 ON CHANNELS 1 AND 3 (XRCP AND XLCP) AND 37 AND 24 ON CHANNELS 2 AND 4 (SRCP AND SLCP). THESE ARE BASED ON THE MAGELLAN EXPERIMENT IN NOV. 1993. CONFIGURATION 1 WILL BE USED ON THE FIRST ORBIT (ORBIT NO. 13,032). THIS WILL BE FOLLOWED BY CONFIGURATION 2 ON THE SECOND ORBIT, CONFIGURATION 2 ON THE THIRD, CONFIGURATION 1 ON THE FOURTH, CONFIGURATION 2 ON THE FIFTH AND FINALLY CONFIGURATION 1 ON THE SIXTH AND FINAL ORBIT (13,037). DSP RECORDING TIMES ARE AS FOLLOWS: START STOP ----- ---- 125300 135700 142500 152900 155800 170200 173100 183500 190400 200800 203700 210000 PLEASE USE THE DSP AND SSI CONFIGURATIONS AS SHOWN BELOW. DSP CONFIGURATION 1 (SB ONLY) ================================================================= PARAMETER DIRECTIVE SETTING NOTES ================================================================= FILTER NUMBER DEFFL 6 6 6 6 20 KHZ BW FILTER OFFSET RIVOF -37500 HZ NBOC MODE 3 SAMPLE RATE NBRAT 25,000 SAMP/SEC IVC SWITCH CFG PRIME CHAN. ASSIGNMENT NBCHN NBOC CH=RIV CH A = 2 SRCP B = 4 SLCP OUTPUT TO SSI SSS A SRCP BIT RESOLUTION NBRES 8 RESOL TAPE DENSITY, BPI DENS 6250 16 MIN/TAPE ================================================================= DSP CONFIGURATION 2 (XB ONLY) ================================================================= PARAMETER DIRECTIVE SETTING NOTES ================================================================= FILTER NUMBER DEFFL 6 6 6 6 20 KHZ BW FILTER OFFSET RIVOF -37500 HZ NBOC MODE 3 SAMPLE RATE NBRAT 25,000 SAMP/SEC IVC SWITCH CFG PRIME CHAN. ASSIGNMENT NBCHN NBOC CH=RIV CH A = 1 XRCP B = 3 XLCP OUTPUT TO SSI SSS A XRCP BIT RESOLUTION NBRES 8 RESOL TAPE DENSITY, BPI DENS 6250 16 MIN/TAPE ================================================================= SSI CONFIGURATION ========================================================= FULL B/W = 20 KHZ INPUT ATTEN = -10 DB AVERAGE = 128 POST FILTER GAIN = 0 DB XFORM = 1024 AVERAGING MODE = LIN PORT = 9 (ODAN) SYNTH FREQ = 2MHZ CTR FREQ = 10KHZ ========================================================== CONSCAN SHOULD BE OFF. R/S PERSONNEL AND NOPE WILL BE ON SITE IN THE CONTROL CENTER TO ANSWER ANY QUESTIONS AND ADDRESS ANY CONCERNS YOU MAY HAVE. Timeline for Magellan bistatic experiment DOY 156-157 =========================================================== Changes to attenuator settings, frequency offsets, or SSI may be requested by R/S personnel in real time. 11:35:00 Begin pre-cal Carry out special ambient load calibration for both X-band channels and then for both S-band channels Finish in DSP configuration for S-band only 12:50:00 Begin track Confirm CONSCAN OFF 12:52:00 Add 15 dB attenuation to channels 2,4 (SR, SL) add 25 dB attenuation to channels 1,3 (XR, XL) 12:53:00 Begin DSP recording 13:02:37 Engineering telemetry OFF 13:04:37 LOS (spacecraft begins turn to Venus) 13:06:21 DSP tunes to echo frequency (no action required) 13:07:00 Remove 15 dB attenuation from channels 2,4 (SR,SL) 13:12:37 Spacecraft begins tracking target 13:35:00 Spacecraft ends tracking target 13:40:05 Enter occultation 13:40:25 Engineering telemetry ON (may not be visible on Earth) 13:47:00 Add 15 dB attenuation to channels 2,4 (SR, SL) 13:48:00 For both channels (S-RCP, S-LCP) switch maser to ambient load for two minutes. Report time and physical temperature of S-band ambient load to JPL. After 2 minutes switch masers back to cold sky, and End DSP recording (no later than 13:57) 13:57:00 Begin DSP configuration for X-band only 14:25:00 Begin DSP recording 14:35:34 Engineering telemetry OFF 14:37:34 LOS (spacecraft begins turn to Venus) 14:40:51 DSP tunes to echo frequency (no action required) 14:42:00 Remove 25 dB attenuation from channels 1,3 (XR, XL) 14:45:34 Spacecraft begins tracking target 15:08:00 Spacecraft ends tracking target 15:13:03 Enter occultation 15:13:22 Engineering telemetry ON (may not be visible on Earth) 15:18:00 Add 25 dB attenuation to channels 1,3 (XR, XL) 15:19:00 For both channels (X-RCP, X-LCP) switch maser to ambient load for two minutes. Report time and physical temperature of X-band ambient load to JPL. After 2 minutes switch masers back to cold sky, and End DSP recording (no later than 15:29) 15:29:00 Begin DSP configuration for S-band only 15:58:00 Begin DSP recording 16:08:31 Engineering telemetry OFF 16:10:31 LOS (spacecraft begins turn to Venus) 16:15:51 DSP tunes to echo frequency (no action required) 16:16:00 Remove 15 dB attenuation from channels 2,4 (SR,SL) 16:18:31 Spacecraft begins tracking target 16:41:00 Spacecraft ends tracking target 16:46:00 Enter occultation 16:46:19 Engineering telemetry ON (may not be visible on Earth) 16:51:00 Add 15 dB attenuation to channels 2,4 (SR, SL) 16:52:00 For both channels (S-RCP, S-LCP) switch maser to ambient load for two minutes. Report time and physical temperature of S-band ambient load to JPL. After 2 minutes switch masers back to cold sky, and End DSP recording (no later than 17:02) 17:02:00 Begin DSP configuration for X-band only 17:31:00 Begin DSP recording 17:41:28 Engineering telemetry OFF 17:43:28 LOS (spacecraft begins turn to Venus) 17:45:51 DSP tunes to echo frequency (no action required) 17:47:00 Remove 25 dB attenuation from channels 1,3 (XR, XL) 17:51:28 Spacecraft begins tracking target 18:14:00 Spacecraft ends tracking target 18:18:57 Enter occultation 18:19:16 Engineering telemetry ON (may not be visible on Earth) 18:24:00 Add 25 dB attenuation to channels 1,3 (XR, XL) 18:25:00 For both channels (X-RCP, X-LCP) switch maser to ambient load for two minutes. Report time and physical temperature of X-band ambient load to JPL. After 2 minutes switch masers back to cold sky, and End DSP recording (no later than 18:35) 18:35:00 Begin DSP configuration for S-band only 19:04:00 Begin DSP recording 19:14:26 Engineering telemetry OFF 19:16:26 LOS (spacecraft begins turn to Venus) 19:20:51 DSP tunes to echo frequency (no action required) 19:21:00 Remove 15 dB attenuation from channels 2,4 (SR,SL) 19:24:26 Spacecraft begins tracking target 19:47:00 Spacecraft ends tracking target 19:51:55 Enter occultation 19:52:14 Engineering telemetry ON (may not be visible on Earth) 19:57:00 Add 15 dB attenuation to channels 2,4 (SR, SL) 19:58:00 For both channels (S-RCP, S-LCP) switch maser to ambient load for two minutes. Report time and physical temperature of S-band ambient load to JPL. After 2 minutes switch masers back to cold sky, and End DSP recording (no later than 20:08) 20:08:00 Begin DSP configuration for X-band only 20:37:00 Begin DSP recording 20:47:23 Engineering telemetry OFF 20:49:23 LOS (spacecraft begins turn to Venus) 20:53:50 DSP tunes to echo frequency (no action required) 20:54:00 Remove 25 dB attenuation from channels 1,3 (XR, XL) 20:57:23 Spacecraft begins tracking target 21:00:00 End of track (DSS 63 only) End DSP Recording (DSS 63 only) DSP TAPES ARE TO BE COPIED WITH THE COPIES HELD ON SITE AND THE ORIGINALS SHIPPED WITH THE NEXT CONSOLIDATED SHIPMENT TO: NDC 230/304A MARKED R/S TAPES FOR SAMI ASMAR. NDC IS TO NOTIFY S. ASMAR AT EXT. 3-6288 UPON ARRIVAL OF THE TAPES. AS ALWAYS, WE APPRECIATE YOUR EXCELLENT SUPPORT. IF THERE ARE ANY QUESTIONS DO NOT HESITATE TO RESPOND BY TWX TO JFTL/MPSETD/J ISAAC OR CALL ME AT 584-4448. REGARDS:ABS/JLI