ESA-JAXA Pre-Launch EarthCARE
Science and Validation
Workshop

13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

Validation Plan for CPR ECO ProductH. Horie, Y. Hagihara, K. Kanemaru and Y. Ohno
NICTCPR Overview and CPR L1b/L2a CPR ECO Products
CPR L1b Product (Major Items):
Reflectivity Factor (Z factor)
Doppler Velocity (Vd)
Surface related product
CPR L2a (CPR ECO) Product:
Integrated Z factor (1/10km)
Integrated Vd (1/10km)
PIA: Path Integrated Attenuation
Clutter Echo
Vd folding/NUBF cprrection
Major Calibration/Validaion Items
Z factor
Doppler Velocity

ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

CPR Calibration PlanCPR Calibration Area

Peak Level Estimation using ARC

External Calibration using ARC is oneof most impordant tasks for CPR
Products.
The bank of Tone-river is used.

1. Orbit Proposal by JAXA CPR Project (3/3)

Kanto Area

Ascendingpass (#A1)

 Orbit design example:•The cross over points
are not necessarily
required to be within theARC site nor VAL site.

•NICT Tokyo location:
139.488514deg E
35.708943deg N

Ascendingpass (#A2)

ARC site #1(West)

Recomended
ANX
Longitude:• Assumedarrival
order:
0.55 to #D1#A1#D2#A2
0.60 deg. due to havea oppotunity 2 times / one
repeat cycle (25days)

VAL site(NICT)

ARC: Active
Radar Calibrator

ARC site #2(East)

RxAnt

TxAnt

ReceiverTransmitter

CalBoxSEA SURFACE CALIBRATION
In addition, the calibration using
Sea Surface Scatterning is also
considered.

Descending
pass (#D1)

Descending
pass (#D2)

Validation
4Super Site

Power Meter

ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

Beam Position Estimation

NICT Koganei (Validation Super Site in Japan)
NICT W-band Cloud Radar for Validation at Koganei Super Site
355nm HSRL

TMU/Kyushu Univ.

NIES

Direct-detection
355nm-wind lidar

355nm
HSRL

Compare using ground-based radarfor Z factor and Doppler Velocity.

Evaluate NUBF for Doppler Velocity
measurement.

Sensitivity -40dBZ @ 15km heightfor integration 1 seconds

One Dimentional Scanning
750m @ 5 km height
Sensitivity:-26dBZ @ zenith-20dBZ @ scan edge

CPR-ARC (3)Calibration

Specification of HSRL using a scanning interferometer

Laser

Injection-seeded, Q-switching Nd:YAG laser (Continuum Surelite I-10)

Wavelength
Pulse energy
Beam div.

355 nm
100 mJ

0.1 mrad (after x5 beam expander)

Repetition rate

10 Hz

NICT

ReceiverTakahashi µ-210 (Dia. = 21cm), Smaller telescope (Dia. = 5cm)

Field-of-view

0.5 mrad (21cm telescope), 1 mrad (5cm telescope)Interferometer

Michelson interferometer, FSR = 2.4 GHz Scanning speed: 1 Hz

94GHz Scanning Radar
ES-SPIDER

Detector

Photomultiplier (Licel PM-HV-R9880)

Acquisition

160MSPS ADC (AVALDATA ADO-1616-STD)

NICTCoherent
2μm-wind Lidar

NICT[Jin et al., 2020,2022]

300m North
NICT

NIES
Near by

NICT
MWR

NICT355nmMFMSPLWind Profiler
LQ-13

94GHz Cloud Radar
HG-SPIDER

In addition, many Lidars (NICT, NIES, TMU and Kyushu-U) and oether instruments*
are operated here.
* MicroWave Radiometer, Wind Profilier, Sky-Camera, etc.

ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), ItalyExample Data of HG-SPIDER
dBZ

Jun. 06, 2023

Jun. 07, 2023

Vd

ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

HG-SPIDER operation statistics
(Jul)

(Aug)

(Sep)

(Oct)

(Nov)

(Dec)

maintenanceJul. 2020〜

Jul. 2021〜

Jul. 2022〜

Over three years, continuosly operated

Jul. 2023〜
until Sep. 19(Jan.)(Feb.)(Mar.)(Apr.)

Jan. 2021〜

Jan. 2022〜

Jan. 2023〜
ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy(May)(June)Seasonal Statistics of HG-SPIDERESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), ItalyExample Data of ES-SPIDERfor NUBF evaluation

Doppler Velocity NUBF Correction(Y. Ohno)
ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

SummaryPrepare CALIBRATION for CPR L1b Product :External Calibration(ARC)Sea Surface Calibration
Prepare VALIDATION for mainly CPR L2a (CPR ECO) Product:
HG-SPIDER statistics comaprison at NICT Koganei Validation Super Site
HG-SPIDER direct comparison with nearest Satellite Track
ES-SPIDER evaluate Doppler Velocity measurement error due to NUBF
OTHER ACTIVITY
WINDAS : Wind Profilier Network at JAPAN (JMA) (Y. Ohno, Presentation Fri., Poster 52)
Ka-band Cloud Profiling Radar Network (NIDS) (T. Ohigashi, Presentation Fri., Poster 49)
Multi-Parameter Phased Array Weather Radar (N. Takahashi, Poster 54)

ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy