CLEM RSS Reduced Bistatic Radar Data (BSR5)

BSR5 – Reduced Bistatic Radar Data

PDS Data Set ID: CLEM1-L-RSS-1-BSR-V1.0 (in the 'img' subdirectories)DOI: 10.17189/1519465

For more information about RSS BSR5 products, see the Data Set Catalog File.

The Radio Science Subsystem (RSS) Reduced Bistatic Radar Data (BSR5) data products are partially and fully reduced products from bistatic radar scattering experiments conducted using the Clementine spacecraft while it orbited the Moon.

The spacecraft radio system was used as a signal source, and the spacecraft high-gain antenna beamed those signals toward surface targets on the Moon. The transmit polarization along the boresight of the spacecraft antenna was right-circular; the nominal wavelength was 13 cm (S-band). Echo signals were received coherently in both right- and left-circular polarizations (RCP and LCP, respectively) using 70 m antennas at stations of the NASA Deep Space Network (DSN) on Earth.

BSR5 products include the following:

RCP.IMG, with its corresponding label file, and LCP.IMG, with its corresponding label file, are calibrated arrays (in PDS IMAGE format) giving echo power in RCP and LCP, respectively.

SRTPWRR.TAB, with its corresponding label file, and SRTPWRL.TAB, with its corresponding label file, contain power measurements from the arrays above, sorted according to proximity to one of 72 surface target points and bistatic angle at that point.

SRTNPWR.TAB, with its corresponding label file, gives the number of measured values that have been associated with each target point at each bistatic angle.

RATIOFN.TAB, with its corresponding label file, gives the RCP to LCP ratio as a function of bistatic angle from the 13 target points poleward of 88° S latitude. The ratio is computed two different ways.

In ODE, these BSR5 products have the following product IDs:

RCP.IMG

LCP.IMG

SORTPOWRR.TAB

SORTPWRL.TAB

SORTNPWR.TAB

RATIOFN.TAB

Ephemerides were used to compute the observing geometry for a 700 x 700 grid. Each grid point was related to a surface point orthographically projected onto a plane tangent to the lunar surface at the South Pole. Various observing parameters were computed at 100 second time steps and stored in PDS IMAGE format. These include:

BET = bistatic angle (degrees)

DAR = area (square meters)

DBR = offset from boresight at the DSN receiving antenna (degrees)

DPR = incremental received power from the surface element (watts)

FQZ = Doppler frequency relative to the South Pole (Hz)

GAM = tilt of the surface element (degrees)

GRX = receiving antenna gain at the surface element (dB)

GTX = spacecraft transmitting antenna gain at the surface element (dB)

RRX = distance from the receiving antenna (meters)

RTX = distance from the spacecraft transmitting antenna (meters)

SBR = offset from boresight at the spacecraft antenna (degrees)

SG0 = assumed specific radar cross section for calculating DPR

THI = incidence angle at the surface element (degrees)

THS = scattering angle at the surface element (degrees)

VAL = validity mask (1 = grid point within lunar disk; 0 = outside)

DFQ = time derivative of FQZ (Hz/sec)

RSS BSR5 parameter products have the following file names:

sssssppp.IMG (with detached PDS label)

where:

sssss = time in seconds UT from 0h at the receiving station on 1994-04-09

ppp = observing parameter defined above

In ODE, BSR5 parameter products have the following product IDs:

SSSSSPPP.IMG