KAGUYA (SELENE) LRS Raw Data

Lunar Radar Sounder Raw Data

SELENE Data Archive:PDS Source Information

PDS3 Datasets: SLN-L-LRS-2-SNDR-WAVEFORM-LOW-V1.0, SLN-L-LRS-2-SNDR-WAVEFORM-HIGH-V1.0

KAGUYA PDS3 to PDS4 Migration Status: N/A

For more information about LRS raw products, see the KAGUYA (SELENE) Product Format Description - Lunar Radar Sounder (LRS).

The KAGUYA Lunar Radar Sounder (LRS) raw data products contain sounder low-resolution subsurface cross section and sounder high-resolution subsurface cross section data.

Two dimensional image data of 256 gray scale levels (1 byte) that exhibit reflected echo strength of a sounder observation along a satellite orbit. The horizontal axis represents satellite flight direction, while the vertical axis is the distance from the satellite, namely the depth in the lunar interior below the lunar surface. Large echo intensities indicate the lunar surface and discontinuities below the lunar surface. This data product corresponds to B-scan image, which can be produced by arranging A-scope images along a satellite orbit. An A-scope image can be generated by FFT processing of a received raw signal of Sounder operation. The spatial resolution along a satellite orbit is 750m (SDR_W and SDR_S modes) or 600m (SDR_A mode) for sounder low-resolution subsurface cross section data, and 75m for sounder high-resolution subsurface cross section data. In cases of SDR_W and SDR_S modes, 10 pulses are averaged to reduce the spatial resolution in the along-track direction. The spatial resolution in the range direction (depth direction) is original 75m. One file is for a region of about 1000km (10 minutes observation) along a satellite orbit.

LRS raw products have the following file names:

Sounder Waveform High Sampling Rate V1.0 data

LRS_SW_WF_mmK_ddddddE.tbl (with detached PDS label)

LRS_SW_WF_mmK_ddddddd.tbl (with detached PDS label)

where:

mm: START_SUB_SPACECRAFT_LATITUDE (or STOP_SUB_SPACECRAFT_LATITUDE) in degrees

K: positive latitude direction

N: North positive

S: South positive

dddddd: START_SUB_SPACECRAFT_LONGITUDE (or STOP_SUB_SPACECRAFT_LONGITUDE)*1000

ddddddd: The seven digits from the left of SPACECRAFT_CLOCK_START_COUNT

Sounder Waveform Low Sampling Rate V1.0 data

LRS_SA_WF_mmK_ddddddE.tbl (with detached PDS label)

LRS_SA_WF_mmK_ddddddd.tbl (with detached PDS label)

where:

mm: START_SUB_SPACECRAFT_LATITUDE (or STOP_SUB_SPACECRAFT_LATITUDE) in degrees

K: positive latitude direction

N: North positive

S: South positive

dddddd: START_SUB_SPACECRAFT_LONGITUDE (or STOP_SUB_SPACECRAFT_LONGITUDE)*1000

ddddddd: The seven digits from the left of SPACECRAFT_CLOCK_START_COUNT

Sounder high-resolution subsurface cross section data

LRS_SWH_RV**_yyyymmddhhmmss.sl2 (with detached PDS label)

where:

S: Data Class, it is data of the Sounder Observation

W: Observation Mode

A: SDR_A

W: SDR_W

S: SDR_S

H: Mode

H: Bscan_High

R: Real Data

S: Stored Data

V**: Version Class

V10: Ver 1

V20: Ver 2

yyyymmddhhmmss: Start date and time of the observation

Sounder low-resolution subsurface cross section data

LRS_SWL_RV**_yyyymmddhhmmss.sl2 (with detached PDS label)

where:

S: Data Class, it is data of the Sounder Observation

W: Observation Mode

A: SDR_A

W: SDR_W

S: SDR_S

L: Mode

L: Bscan_Low

R: Real Data

S: Stored Data

V**: Version Class

V10: Ver 1

V20: Ver 2

yyyymmddhhmmss: Start date and time of the observation

In ODE, LRS raw products have the following product IDs:

Sounder Waveform High Sampling Rate V1.0 data

LRS_SW_WF_mmK_ddddddE

LRS_SW_WF_mmK_ddddddd

Sounder Waveform Low Sampling Rate V1.0 data

LRS_SA_WF_mmK_ddddddE

LRS_SA_WF_mmK_ddddddd

Sounder high-resolution subsurface cross section data

LRS_SWH_RV20_yyyymmddhhmmss

LRS_SSH_RV20_yyyymmddhhmmss

Sounder low-resolution subsurface cross section data

LRS_SWL_RV10_yyyymmddhhmmss

LRS_SAL_RV10_yyyymmddhhmmss

LRS_SSL_RV10_yyyymmddhhmmss