ROUTING: JFTL / JJPL / JOCC / ANBE / JGTS FROM: MPSET(D) Joe Green/ J. Velasco SUBJECT: Mars Express (MEX) Radio Science Test Supports SCHEDULE: Refer to DSN 7-Day Schedule for actual support times. DOY BOA BOT EOT EOA DSS USER ACTIVITY --- ---- ---- ---- ---- 191 1120 1250 1930 2000 43 MEX T/P NEVP R/S 192 0530 0700 1355 1410 24 MEX T/P NEVP R/S 195 0535 0705 1450 1505 24 MEX T/P NEVP R/S 200 0535 0705 1400 1415 26 MEX T/P NEVP R/S 1. PURPOSE: To exercise spacecraft and station configurations for activities such as; Bistatic Radar measurements, occultations, gravity wave experiments and Solar Conjunction in preparation for actual Radio Science observations. 2. OBJECTIVE: a. Demonstrate that the DSN can support the various configurations required for successful Bistatic Radar measurement activities. b. Exercise spacecraft configuration to be used for planned radio science experiments. 3. SUPPORT DOCUMENTATION a. NOP 871-049-041 b. This briefing message c. DSN Key Word File d. Project Sequence of Events 4. SUPPORT REQUIREMENTS: General a. The Radio Science Systems Group will remotely control the Radio Science Receiver(RSR)for all scheduled supports. b. X-Band and S-Band ranging will be performed. c. The spacecraft will be transmitting XRCP and/or SRCP. d. Nominal predictions for X/X, S/S X/S X/X are to be generated. e. X-Band Telemetry will be prime for all supports. f. Enable prime data stream to line as required. g. The MSE/NOPE will be on duty in the ROSA for these activities. h. All stations are required to acquire S-Band carrier lock only. S-Band Telemetry will not be present on the downlink. i. Station is required to configure for support in accordance with Table-2. j. Configure both receiver(s) with the configuration table listed below in table-2. Bistatic Radar Measurement Test Support Requirements. (DSS-43 Only) a. 70-Meter antenna support is required. b. Closed-loop and Open-Loop receivers are required. c. For X-Band, the fixed channel HEMT are configured LCP/RCP at all times. d. For S-Band, the HEMT in MOD-III will be configured for low noise path. e. The cone TWM will be configured for the diplex path. f. Record Noise Diode on and off times and report to Radio Science Group and MSE/NOPE. g. Configure Receivers for (1) XRCP/(2) XLCP/(3) SRCP/(4) SLCP for both Closed and Open-Loop as required. h. Perform Y-Factor measurements for all receiver channels and perform noise diode calibrations during the Setup and Teardown periods. k. Configure both X-Band receivers with the configuration table listed below in table-2. Configure-one receiver for XRCP and the other receiver for XLCP. RADIOMETRIC Table-1. DSS-43 Microwave Configuration --------------------------------------- S-Band S-Band LNA Low Noise Path HEMT Diplex Mode TWM X-Band X-Band LNA XTR Cone HEMT XTR Cone HEMT Table-2. Spacecraft/Receiver Configuration ------------------------------------------------------------- DOY DSS BAND RCV CONFIG TABLE ------- ------ --------------------- ---------------- DOY 191 DSS-43 X-Band Up/X-Band Down 7041hrx.cfg DOY 192 DSS-24 S-Band Up/S-Band Down 3441hrs.cfg X-Band Down 3441hrsx.cfg DOY 195 DSS-24 X-Band Up/X-Band Down 3441hrx.cfg S-Band Down 3441hrxs.cfg DOY 200 DSS-26 X-Band Up/X-Band Down 3441hrx.cfg Table-3. Ranging Configuration ------------------------------------------------------ DOY DSS RANGING CONFIG MOD INDEX (RAD) X-BAND S-BAND --- --- ------------------ ------------------- 191 43 X-Up/Down (X = 0.2) N/A 192 24 S-Up/Down + X-Down (X = 0.2) (S = 0.1) 195 24 X-Up/Down + S-Down (X = 0.2) (S = 0.1) 200 26 X-Up/Down (X = 0.2) N/A TELEMETRY a. The telemetry system should be configured in accordance with (IAW) section 7 of the MEX NOP. b. The telemetry data rate willl be 209715.2sps. c. The telemetry Mod index will be 1.25 rad. d. Enable the out put from the telemetry channel that is configured for the D/L path with the polarization X-Band RCP. e. X-Band will be prime for all supports. f. There is no telemetry modulation on the S-band downlink (Carrier Only) COMMAND a. The command system should be configured IAW section 8 of the MEX NOP. b. The command data rate will be 2000bps. c. The command index : S-Band =0.8 rad, X-Band=1.0 rad. MONITOR & CONTROL N/A RADIO SCIENCE Noise Diode Calibration Procedure. Setup: 1) Antenna at zenith 2) Verify RSR recording .( Remotely controlled by RSR Team ) 3) Antenna on Cold sky (2 Min) 4) Antenna/UWV cold sky and 12K Noise Diode ( 2 Min ). 5) Antenna/UWV Ambient Load (2Min). 6) Antenna/UWV Ambient Load and 12K Noise Diode (2Min). 7) Perform Y-factor measurements for all four channels (XRCP/XLCP/SRCP/SLCP) Experiment: The NMC Link controller will need to manually turn the 12K Noise Diode on and off during the support on DOY 191 at the following times: START STOP ----- ----- 1410Z 1415Z 1510Z 1515Z 1610Z 1615Z 1700Z 1705Z This allows us to capture the calibration in the regular data stream (at a slight reduction in SNR over those 2 minutes). Teardown: 1) Antenna at zenith 2) Antenna on Cold sky (2 Min) 3) Antenna/UWV cold sky and 12K Noise Diode ( 2 Min ). 4) Antenna/UWV Ambient Load (2Min). 5) Antenna/UWV Ambient Load and 12K Noise Diode (2Min). 6) Perform y-factor measurements for all four channels (XRCP/XLCP/SRCP/SLCP) 7) RSR recording stopped by RSR Team . Note: 1)Record of Ambient Load Temp Date. 2)Record of 12K Noise Diode on / off times. 3)Record of Ambient Load switching times . GCF a. Voice: DSS / JPL / ROSA MOPS/AMMOS/MEMOC b. Data: DSS / JPL /AMMOS/ESA/MEMOC NOCT Prior to each scheduled support, NOCT personnel are requested to transmit the following predictions to supporting station as depicted below. Note: reference table-2 DOY DSS PREDICTS SUPPORT CONFIGURATION PASS NO. --- --- ------------ --------------------- -------- 191 43 MEX_030613_X x-up x-down 0039 MEX_030613XS x-up s-down 192 24 MEX_030613_S s-up s-down 0039 MEX_030613SX s-up x-down 195 24 MEX_030613_X x-up x-down 0042 MEX_030613XS x-up s-down 200 26 MEX_030613_X x-up x-down 0047 5. DELIVERABLES: a. The Radio Science Systems Group will record data at the RSR beginning at setup through the end of teardown activities. b. Following the S-Band Uplink support on DOY 192, the X-Band exciter table will be delivered to DSS-24 for the support on DOY 195. 6. MISCELLANEOUS: N/A 7. SEQUENCE OF EVENTS: <> 8. POINTS OF CONTACT: MPSETD (e-mail: DSN-MPSETD@jjpl.jpl.nasa.gov): PSD Team Office Pager ----------------------------------- ------------ ------------ Joe Green (MSE) 626-584-4472 626-932-7751 Jose Valencia(Lead NOPE) 626-584-4554 Jesse Velasco(NOPE) 626-584-4448 Khanh Ly (NOPE) 626-584-4690 Romy Paredes(NOPE) 626-584-4635 Remote Operations Support Area: 626-584-4412 626-584-4411 Radio Science Operations Room: 818-393-0666 Regards, Jesse Velasco