PDS_VERSION_ID = PDS3 LABEL_REVISION_NOTE = "2004-03-05; JJZ-ESA" RECORD_TYPE = STREAM DATA_SET_ID = "MEX-M-MRS-1/2/3-MCO-0047-V1.0" PRODUCT_ID = "R4021" PRODUCT_CREATION_TIME = 2006-03-29T18:15:04.000 ^ASCII_DOCUMENT = "R4021.ASC" ^WORD_DOCUMENT = "R4021.DOC" DESCRIPTION = " This document is a (1) set of notes (mostly in tabular form) recording the progress of the Mars Express bistatic radar experiment conducted on 21 January 2004, and (2) a set of plots showing normalized power spectra from each receiver channel when the surface echo was strongest. These are stored in this volume in the subfolder DOCUMENTS/DSN_DOC/JPEG. The text of the document (1) has three parts. The first part lists files needed for carrying out the experiment and contact information for key people involved. The second part of (1) is a large table giving a time-ordered summary of events. Details on the table layout and contents are below. The third part of (1) are comments from debriefing sessions after the experiment, including suggestions from staff at DSS 43 on how future experiments could be conducted better. The text of the document (1) is presented in two formats: a) ASCII and b) Microsoft Word. Table Description: The table has 16 columns and many rows; each row summarizes experiment status or reports on an event at (approximately) the time given in the first column (Earth Receive Time, ERT). A terse description of the event is given in column 2 (Activity). Columns 4- 6 summarize status for the X-RCP channel/receiver. Columns 7- 9 summarize status for the S-RCP channel/receiver. Columns 10-12 summarize status for the S-LCP channel/receiver. Columns 13-15 summarize status for the X-LCP channel/receiver. Within these triplets of columns, the first holds the root mean square (rms) sample value, the second holds the signal-to-noise ratio (SNR) reported by the system, and the third holds 'other' values which are specified in Column 3. Column 16 tells whether the RSR's were running ('R') or idle (blank). For example, at 01:42, the S-LCP channel was observed to have rms sample value = 29 RSR fgain = 63 sample rate = 25 ksps (bandwidth = 25 kHz) bits per sample = 16 frequency offset = 0 RSR status = running Plot Files: In (2) there are 4 sets of 24 JPEG files, each from a different receiver and showing circularly polarized received power spectra averaged over 60 seconds. The receivers are S-LCP, S-RCP, X-LCP, and X-RCP. Twenty-four spectra are included in each plot set, covering 24 minutes of Mars Express bistatic radar data collection at DSS 43 on 2004-01-21. Times are indicated in the upper right corner of each plot. To obtain each plot, the raw data spectrum was divided by a power spectrum containing only noise and averaged over 10-60 minutes from the same channel; this step 'equalizes' or flattens the filter response. The noise baseline (average noise level at frequencies where no signal was present) was then subtracted from the equalized spectrum, and the result was plotted. The X-band bistatic surface echoes appear on the left, grow in intensity to a peak value, then fade. The narrow spike in the right half of each X-band spectrum is a leakage signal propagating directly to Earth from a sidelobe of the spacecraft high-gain antenna. There appear to be no S-band signals from either the surface or sidelobes. These data are similar to the tabular Level 2 products that will be derived from Mars Express bistatic radar data. The experiment conducted on 2004-01-21 was not accurately calibrated, however; so Level 2 products, if generated, will be of limited scientific value." OBJECT = ASCII_DOCUMENT INTERCHANGE_FORMAT = ASCII DOCUMENT_FORMAT = TEXT FILES = 1 DOCUMENT_NAME = "Notes from Bistatic Radar Experiment 21 January 2004" PUBLICATION_DATE = 2004-01-21 DOCUMENT_TOPIC_TYPE = "OPERATIONS REPORT" DESCRIPTION = "Plain text version of the file. Converted from Microsoft Word by Dick Simpson; last edited for appearance on 2004-11-03." END_OBJECT = ASCII_DOCUMENT OBJECT = WORD_DOCUMENT INTERCHANGE_FORMAT = BINARY DOCUMENT_FORMAT = "MICROSOFT WORD" FILES = 1 DOCUMENT_NAME = "Notes from Bistatic Radar Experiment 21 January 2004" PUBLICATION_DATE = 2004-01-21 DOCUMENT_TOPIC_TYPE = "OPERATIONS REPORT" DESCRIPTION = "Microsoft Word version of the file." END_OBJECT = WORD_DOCUMENT END