MGN RSS Calibrated Data Record (PRR and PRT)

PRR & PRT– RSS Calibrated Data Record

PDS3 Data Set ID: MGN-V-RSS-4-BSR-V1.0 (in the PRR and PRT subdirectories)DOI: 10.17189/1522531

PDS4 Bundle: urn:nasa:pds:magellan_bsr_calibratedDOI: 10.17189/c7sf-7t57

For more information about RSS PRR and PRT products, see the Bistatic Radar Calibrated Data Set Description.

The Radio Science Subsystem (RSS) Calibrated PRR and PRT data products are time samples, which have been calibrated in amplitude so that they yield (directly) the power spectral density in zeptowatts per hertz (1 zW = 10-21 W) when Fourier transformed. The amplitude calibrated data are presented in two forms: first, as they would have been generated by an ideal (amplitude calibrated) receiver (data type PRR) and, second, as they would have appeared if the receiver have been tuned to keep the surface echo approximately centered in the output bandwidth (data type PRT).

PRR Data: are the amplitude-calibrated complex time samples. A power spectrum computed from a PRR file should be absolutely calibrated in units of zeptowatts (10^-21 W). PRR files have a single header record followed by many data records containing double-precision complex time samples. Each file is defined as a pair of PDS TABLE objects with the first TABLE corresponding to the header record and the remaining (data) records making up the second TABLE. A typical PRR file contains 16 minutes of data with a complex I/Q pair of samples every 40 microseconds (25000 samples per second). A single (binary) complex sample requires 16 bytes for storage; the volume of a 16-minute file is 383975424 bytes.

PRT Data: are the amplitude- and frequency-calibrated complex time samples. The PRT data have the major sources of Doppler shift and other frequency effects removed. The corrections for Doppler and other frequency effects should place the surface echo centroid in the range 10000-15000 Hz, where the total bandwidth is 25000 Hz.

RSS PRR and PRT products have the following file names:

ydddhhmc.xxx (with detached PDS labels for each product)

where:

y = one-digit year (4)

ddd = three-digit day of year (156)

hh = two-digit hour

m = tens of minutes when the file started

c = letter denoting frequency band and polarization of the data in the file

B = S-Band right-circular polarization(RCP)

D = S-Band left-circular polarization(LCP)

xxx = file extension

PRR = PRR-type data file

PRT = PRT-type data file

In ODE, PRR and PRT products have the following product IDs:

YDDDHHMC