The aim of this document is a brief description of the impact on the MARSIS science performances during the X-Transmitter On of the SC. This study was carried out both on the Ionosphere and Sub Surface Science analysis

CICCHETTI, ANDREA

OA@INAF - Istituto Nazionale di Astrofisica

2010Publication Year2023-02-07T14:02:07ZAcceptance in OA@INAFCompatibility Test First Part MARSIS Active / SC X-Band OnTitleCICCHETTI, ANDREAAuthorshttp://hdl.handle.net/20.500.12386/33208Handle   Data         01/03/2010 Issue         2 Revision   0 Page 1 of  11  MEX/MARSIS           Compatibility Test First Part MARSIS Active / SC X-Band On       OLD CATALOGUE:  MRS-001/005/07/ ISSUE 1 / REVISION 0 Date 30/01/2007      PREPARED by : Andrea Cicchetti  CHECKED by : Jeff J. Plaut  APPROVED by : Roberto Orosei            Data         01/03/2010 Issue         2 Revision   0 Page 2 of  11 MEX/MARSIS    DISTRIBUTION LIST  Name Q.ty Name Q.ty G. PICARDI / INFOCOM 1 A. CHICARRO/PST 1 E. FLAMINI / ASI 1 F. JANSEN/PST 1 R. SEU / INFOCOM 1 T. ZEGERS / PST 1   H. WALKER / POS 1 C. CATALLO / A-ALS 1   O. BOMBACI / A-ALS 1   D. CALABRESE / A-ALS 1 M. DENIS / ESOC 1 A. CROCE / A-ALS 1 E. RABENAU / ESOC 1   J.SCHULSTER/ESOC 1 J. J PLAUT / JPL 1 P. JAYARAMAN 1 A. SAFAEINILI / JPL 1   D. KIRCHNER/U of IOWA 1     Data         01/03/2010 Issue         2 Revision   0 Page 3 of  11 MEX/MARSIS   Table of Contents 1 INTRODUCTION .................................................................................................................................................... 4 2 ORBIT ENVIRONMENTAL CONFIGURATION ................................................................................................ 5  2.1 ORBIT 3773 (ADJACENT OBSERVATION, 11 ORBIT BEFORE THE TEST) ................................................................ 5 2.2 ORBIT 3795 (ADJACENT OBSERVATION, 11 ORBITS AFTER THE TEST) ................................................................. 5 2.3 ORBIT 3784 (COMPATIBILITY TEST) .................................................................................................................... 5 3 SUB SURFACE SCIENCE RESULTS ................................................................................................................... 6 3.1 ORBIT 3773 (ADJACENT OBSERVATION, 11 ORBITS BEFORE THE TEST)............................................................... 6 3.2 ORBIT 3795 (ADJACENT ORBIT, 11 ORBITS AFTER THE TEST).............................................................................. 7 3.3 ORBIT 3784 (COMPATIBILITY TEST) .................................................................................................................... 8 4 ACTIVE IONOSPHERIC SCIENCE ANALYSIS ................................................................................................ 9 4.1 ORBIT 3773 (ADJACENT OBSERVATION, 11 ORBIT BEFORE THE TEST) ................................................................ 9 4.2 ORBIT 3795 (ADJACENT OBSERVATION, 11 ORBIT AFTER THE TEST) .................................................................. 9 4.3 ORBIT 3784 (COMPATIBILITY TEST) .................................................................................................................. 10 5 CONCLUSIONS ..................................................................................................................................................... 11   Data         01/03/2010 Issue         2 Revision   0 Page 4 of  11 MEX/MARSIS   1 INTRODUCTION  The aim of this document is a brief description of the impact on the MARSIS science performances during the X-Transmitter On of the SC. This study was carried out both on the Ionosphere and Sub Surface Science analysis.  Due to a large number of missing packets on the Flash Memory timeline, executed in the same orbit of the X-Tx test, it hasn’t been possible to investigate also on the FM science performance; at this point we would not be able to conclusively assess that the missing packets have been caused by the X Band ON, since anomalies similar to this are occasionally present.  In order to study and understand the possible anomalies of the X-Band On of the SC during the MARSIS operations we have analyzed two adjacent observations in the same area, 11 orbits before and 11 orbits after the compatibility test.   Data         01/03/2010 Issue         2 Revision   0 Page 5 of  11 MEX/MARSIS   Plain Nadir Slew 2 ORBIT ENVIRONMENTAL CONFIGURATION  2.1 Orbit 3773 (Adjacent Observation, 11 orbit before the Test) Pericenter data: 15 – December -06, T 04:40:48 UTC  Plain Nadir    AIS Slow Power Up AIS Preparation  AIS   OST 3 B3/B2 OST 4 B3/B2 OST 5 B3/B2 OST 6 B4/B3 OST 7 B4/B3  STBY PREO POST  -27.0 -22.0 -20.0 -15.0 -14.5 -7.5 0.0 +5.75 +10.0 +14.5 +15.0 +20.0 22.0 Time Off Pericenter [min]   2.2 Orbit 3795 (Adjacent Observation, 11 Orbits after the test) Pericenter data: 21 – December -06, T 08:31:36 UTC          -27.0 -22.0 -20.0 -15.0 -14.5 -7.5 0.75 +7.25 +14.5 +15.0 +20.0 22.0 Time Off Pericenter [min]  2.3 Orbit 3784 (Compatibility Test) Pericenter data: 18 – December -06, T 06:36:10 UTC             -27.0 -22.0 -20.0 -15.0 -14.5 -7.5 0.5 +6.5 +10.75 +14.5 +15.0 +20.0 22.0 Time Off Pericenter [min] POST PREO STBY OST 6 B4/B3 OST 5 B3/B2 OST 4 B3/B2 OST 3 B3/B2 AIS AIS +5.15 Plain Nadir Slew AIS FM Data Take AIS STBY PREO OST 3 B2/B1 OST 4 B2/B1 OST 5 B3/B2 OST 6 B4/B3 OST 7 B4/B3 POST   Data         01/03/2010 Issue         2 Revision   0 Page 6 of  11 MEX/MARSIS   Sun = -32° Sun = -15° Sun = 0° Sun = 10° Plain Nadir OST 3 B3 OST 4 B3 OST 5 B3 OST 6 B4 OST 7 B4 Fig. 3.1.1 (MARSIS Radargram, first Tx Bands) Plain Nadir OST 3 B2 OST 4 B2 OST 5 B2 OST 6 B3 OST 7 B3 3 SUB SURFACE SCIENCE RESULTS  3.1 Orbit 3773 (Adjacent Observation, 11 Orbits before the test)    Fig. 3.1.2 (MARSIS Radargram, second Tx Bands)   The performances of MARSIS are standard until the OST line 4, for both the transmitted bands. It is well evident a small degradation of the SNR and the spatial resolution starting from the OST line 5, second transmitted band (Fig. 3.1.2), caused by the sun ionization of the upper ionosphere layer. In the OST lines: 6 and 7, for both the Radar Bands, it is shown the behavior of the Northern Polar Cap, it is also evident the bottom of the Cap.   Data         01/03/2010 Issue         2 Revision   0 Page 7 of  11 MEX/MARSIS   OST 3 B3 OST 3 B2 OST 4 B2 OST 5 B2 OST 6 B3 Fig. 3.3.2 (MARSIS Radargram, first Tx Bands) OST 6 B4 OST 5 B3  gram, first Tx Bands) Plain Nadir OST 4 B3  Fig. 3.3.1 (MARSIS Radar    Plain Nadir Sun = 0° Sun = -15° Sun = -32°  3.2 Orbit 3795 (Adjacent Orbit, 11 Orbits after the test)    MARIS performance is standard until the OST line 5, first transmitted bands (Fig. 3.3.1) and for the OST lines: 4, 5 second transmitted bands (Fig. 3.3.2). A degradation of the SNR and the spatial resolution have been detected in the OST line 6, first transmitted band (Fig. 3.3.1) and in the OST lines: 3 and 6, second transmitted bands (Fig. 3.3.2). The loss of performance has been caused by the ionization of the upper ionosphere layer. The OST line 3, Band 2 (Fig. 3.3.2) presents a strong degradation of the performances due to the combination of the surface topography and the ionization of the upper ionosphere layer.   Data         01/03/2010 Issue         2 Revision   0 Page 8 of  11 MEX/MARSIS   Sun = 0° Sun = +10° SC Slew OST 3 B2 OST 5 B3 OST 6 B4 OST 7 B4 Radargram, first Tx Bands) SC Slew OST 3 B1 OST 4 B1 OST 5 B2 OST 6 B3 OST 7 B3 Plain Nadir OST 4 B2  Fig. 3.2.1 (MARSIS     Plain Nadir Sun = -15° Sun = -32°  3.3 Orbit 3784 (Compatibility Test)   Fig. 3.2.2 (MARSIS Radargram, first Tx Bands)    In all the OST lines, for both the Radar channels; there is present a strong component of the noise figure that has affected the whole observation. The phenomena is much evident in the OST lines: 3 and 4 of the second transmitted Bands (Fig. 3.3.2). In fact, the Radar Band 1 is more sensitive to the environmental condition and in particular to the upper ionosphere layer also in the deepest nigh side. In the OST line 6 for both the Radar bands, the loss of performances have been probably caused by a combination of the upper ionosphere layer, the SC slew and the X-Band On of the SC’s transmitter.   Data         01/03/2010 Issue         2 Revision   0 Page 9 of  11 MEX/MARSIS   4 ACTIVE IONOSPHERIC SCIENCE ANALYSIS  4.1 Orbit 3773 (Adjacent Observation, 11 orbit before the Test)  Fig. 4.1.1 (MARSIS AIS Ionogram, Orbit 3773)   4.2 Orbit 3795 (Adjacent Observation, 11 orbit after the Test)  Fig. 4.2.1 (MARSIS AIS Ionogram, Orbit 3795)   Data         01/03/2010 Issue         2 Revision   0 Page 10 of  11 MEX/MARSIS    4.3 Orbit 3784 (Compatibility Test)  Fig. 4.3.1 (MARSIS AIS Ionogram, Orbit 3784)  There are a couple of lines that show up around 2.5MHz (Fig. 4.3.1) that are not present during other time periods (Fig. 4.1.1) and (Fig. 4.2.1). Interference similar to this is occasionally present.   Data         01/03/2010 Issue         2 Revision   0 Page 11 of  11 MEX/MARSIS   5 CONCLUSIONS  The X-Band On of the SC may have slightly affected the MARSIS science performance in SSX mode (Sub Surface Sounding mode) in the loss of SNR (Signal To Noise Rate).  There has also been detected a frequency line of about 2.5 MHz during the AIS mode (Active Ionosphere Sounding mode) typically not present during the past observations.  Concluding, the interferences detected in SSX and AIS modes are not damaging, in general, the MARSIS Science Performances and we don’t have concerns about the simultaneous operation of MARSIS and the X-band of the SC. 

Compatibility Test First Part MARSIS Active / SC X-Band On

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Compatibility Test First Part MARSIS Active / SC X-Band On

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