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LAPAN-A3 / IPB microsatellite / LISat of Indonesia

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LAPAN-A3/IPB, also referred to as LISat, is a cooperative remote sensing microsatellite project between LAPAN (National Institute of Aeronautics and Space of Indonesia) Jakarta and IPB (Bogor Agricultural University or Institute Pertanian Bogor) located in Bogar, Indonesia. The objective of the demonstration mission is to monitor food resources in Indonesia and to provide environmental monitoring. The real goal of LAPAN-A3/IPB is to provide actual, frequent and accurate data for observing and predicting the condition of the Indonesian archipelago. The Republic of Indonesia with an estimated population of 258 million is the largest archipelago (island country) in the world with more than 17,500 islands, 2/3 of the country's terretory is covered by the sea and 1/3 of the country is land mostly covered by forest and agriculture. — In this cooperative project, LAPAN is responsible for the design and development of the microsatellite, while IPB is in charge for algorithm and dataset application development. 1) 2)

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Figure 1: Overview of LAPAN's satellite development program (image credit: LAPAN)

 


 

Spacecraft:

LAPAN-A3/IPB is a microsatellite for experimental remote sensing and maritime traffic monitoring. 3) 4)

1) LAPAN-A3/IPB was developed based on the LAPAN-A2/ORARI satellite bus with several enhancements to accommodate the linear imager payload.

2) The satellite mission is to identify land cover and land use and to monitor environmental degradation.

3) To perform such a mission, LAPAN-A3/IPB carries a medium resolution multispectral (4-band) imager and a digital camera

4) As the satellite of a maritime country, LAPAN-A3/IPB also supports global maritime traffic monitoring by receiving the AIS signals of ships in the ground segment.

Spacecraft dimensions

50 cm x 57.4 cm x 42.4 cm

Spacecraft mass

~ 115 kg

EPS (Electric Power Subsystem)

- 5 GaAs solar arrays @ 46.5 cm x 26.2 cm, 30 cells in series; max power of 37 (BOL)
- 3 packs of Li-ion batteries, 4 cells per pack, 15 V nominal voltage, 6.1 Ah capacity

OBDH (On-Board Data Handling) Subsystem

- The OBC is a 32 bit RISC processor with 128/256 MB internal memory, 1 MB external static RAM, and 1 MB external flash memory

ADCS (Attitude Determination and Control Subsystem)

- 3 wheels/fiber optic laser gyros in orthogonal configuration
- 2 Star sensors (1 CCD and 1 CMOS)
- 3 magnetic coils
- 6 single solar cells for sun sensors
- 3-axis magnetometers

RF Communications

- 2 UHF TT&Cs, frequency = 437.425 MHz, modulation = FFSK, 3.5 W RF output power
- X-band, frequency = 8200 MHz, data rate = 105 Mbit/s, 6 W max RF output power
- S-band, frequency = 2220 MHz, 3.5 W max RF output power

- HDRM (High Data Rate Modem) for simulation experiments

Table 1: Technical specifications of the LAPAN-A3/IPB microsatellite

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Figure 2: Two views of the LAPAN-A3/IPB microsatellite (image credit: LAPAN)

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Figure 3: Illustration of the data handling concept (image credit: LAPAN)

 

Launch: LAPAN-A3/IPB was launched on June 22, 2016 (03:56 UTC) as a secondary payload to ISRO's CartoSat-2C spacecraft. The launch site was SDSC (Satish Dhawan Space Center) in India and the launch vehicle is PSLV-C34. 5)

The secondary payloads (19) on this flight were:

• SkySat-3, the first operational satellite (120 kg) in Terra Bella's constellation of 21 Earth observation satellites.

• BIROS (Bi-spectral InfraRed Optical System), a 130 kg minisatellite of DLR. The BIROS satellite is part of DLR's FireBird constellation, which consists of two spacecraft, TET-1 and BIROS.

- BIROS carries onboard the picosatellite BEESAT-4 (Berlin Experimental and Educational Satellite-4) of TU Berlin(1U CubeSat, 1 kg) and release it through a spring mechanism [ejection by SPL (Single Picosatellite Launcher ) after the successful check-out and commissioning of all relevant BIROS subsystems]. After separation, it will perform experimental proximity maneuvers in formation with the picosatellite solely based on optical navigation.

• M3MSat (Maritime Monitoring and Messaging Microsatellite), a Canadian technology demonstration microsatellite (85 kg) joint mission funded by DND (Department of National Defence) and CSA (Canadian Space Agency), exactEarth and COM DEV Ltd. M3MSat carries two advanced AIS (Automatic Identification System) payloads to monitor maritime shipping.

• LAPAN-A3 (Lembaga Penerbangan dan Antariksa Nasional-A3), an Earth observation microsatellite (115 kg) developed in Indonesia.

• GHGSat-D (Greenhouse Gas Satellite – Demonstrator), a 15 kg commercial venture of GHGSat Inc. of Montreal, Canada, a subsidiary of Xiphos Systems Corporation. GHGSat-D was built at UTIAS/SFL. GHGSat's mission is to become the global reference for remote sensing of greenhouse gas (GHG) and air quality gas (AQG) emissions from industrial sites, using satellite technology.

• SathyabamaSat, a 2U CubeSat of Sathyabama University (1.5 kg), India. The satellite will measure the densities of the greenhouse gases over the region over which it moves, using an ARGUS 1000 IR Spectrometer.

• Swayam, a 1U CubeSat of the College of Engineering (1 kg), Pune, India.

• 12 Flock-2p Earth observation satellites (3U CubeSats) of Planet Labs (each with a mass of 4.7 kg), San Francisco, CA.

 

Orbit: Sun-synchronous circular orbit, altitude = 515 km, inclination = 97.5º, local time on descending node (LTDN) = 9:30 hours.

The the LAPAN-A3/IPB mission, this polar sun-synchronous orbit will make about two times contact per day (day and night) of about 11 minutes average. In this limited contact scenario, much of data will be downlinked in near real time to the ground station through - band communication link that contain the information of data imagery and shipping monitoring data as well.

Indonesia is located approximately between 94º45' E and 141º 65' E, equivalent to ~ 5,150 km along the length of the equator (1/8 of the Earth circumference), with the widest breadth between 6º 8' N and 11º 15' S (~ 2000 km). It is an archipelago positioned between the Indian and Pacific Oceans, and between the Asian and Australian continents. However, the need for space utilization in Indonesia is significant to be able to address solutions to the Indonesian people. The remote sensing data are needed for such applications as agriculture, forestry, fishing, etc.

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Figure 4: Presentation of LAPAN-A2/ORARI (blue, near equatorial) and LAPAN-A3/IPB satellites (sun-synchronous) orbital coverage for countries like Indonesia (image credit: LAPAN)

 


 

Mission status:

• March 5, 2018: According to information provided by Robertus Heru Triharjanto of LAPAN, the two satellites, LAPAN-A2 and LAPAN-A3 are operating nominally in 2018 (Ref. 7).

1) LAPAN-A2 has served the amateur radio community in South East-Asia and South America.

2) The AIS (Automatic Identification System) receiver on LAPAN-A2 and on LAPAN-A3 has contributed to maritime surveillance in Indonesian waters.

3) The LAPAN-A3 multispectral imager data has been used by the remote sensing communities in Indonesia.

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Figure 5: LAPAN-A2 & LAPAN-A3 data tracking of the Equanimity ship in February 2018. The ship was hiding in Indonesian waters trying to escape from FBI surveillance (image credit: LAPAN)

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Figure 6: LAPAN-A2 & LAPAN-A3 data tracking of the Cledonia Sky ship that sailed into a prohibited area and damaged the coral reef at Raja Ampat, Papua in March 2017 (image credit: LAPAN)

• September 2017: As the LAPAN-A3 satellite itself is still an experimental satellite and yet reached its full operational capacity, the project was not yet able to exploit the necessary information to perform the necessary radiometric and atmospheric correction. Therefore, the spectral comparison performed in this study was meant to be a first step towards a more comprehensive radiometric correction of LAPAN-A3 using relative radiometric normalization technique. 6)

- LAPAN-A3/LAPAN-IPB was launched on October 2016 as part of the Indonesian National Institute of Aeronautics and Space program on Space Technology. LAPAN-A3 is carrying multiple payloads including multispectral push-broom imager, digital matrix camera, as well as video camera. The multispectral payload, dubbed as Line Imager Space Application (LISA), has four multispectral bands ranging from visible to near infrared spectrum. With 123 km swath width, it falls between the 185 km of Landsat-8 OLI and the 100 km tiled Sentinel-2A/2B MSI data. With this successful launch, there have not been many comparative analyses between these platform in terms of image quality, classification, and accuracy assessment. Tabel 2 shows the multispectral characteristics of LAPAN-A3 compared to two Sentinel-2 medium resolution EO satellites.

LAPAN-A3

Sensor

Band

Spectral range

Resolution

Swath width

Revisit time

Data quantification

LISA (Line Imager
Space Application)

B1 - Blue
B2 - Green
B3 - Red
B4 - NIR

0.41 – 0.49 µm
0.51 – 0.58 µm
0.63 – 0.70 µm
0.77 – 0.99 µm

18 m
18 m
18 m
18 m

122.4 km

21 days

16 bit

Sentinel-2A

MSI (MultiSpectral
Instrument)

B1 -Coastal Aerosol
B2 - Blue
B3 - Green
B4 - Red

B5 - Red Edge 1
B6 - Red Edge 2
B7 - Red Edge 3
B8 - NIR
B8A - NIR Narrow
B9 - Water Vapor
B10 - Cirrus
B11 - SWIR 1
B12 - SWIR

0.433 – 0.453 µm
0.458 – 0.523 µm
0.543 – 0.578 µm
0.650 – 0.680 µm

0.698 – 0.713 µm
0.733 – 0.748 µm
0.765 – 0.785 µm
0.785 – 0.900 µm
0.855 – 0.875 µm
0.930 – 0.950 µm
1.365 – 1.385 µm
1.565 – 1.655 µm
2.100 – 2.280 µm

60 m
10 m
10 m
10 m

20 m
20 m
20 m
10 m
20 m
60 m
60 m
20 m
20 m

290 km

10 days
(5 days with
Sentine l-2B)

12 bit

Table 2: Multispectral Sensor characteristics of LAPAN-A3 LISA and Sentinel-2A MSI. Bands with bold font marked the corresponding bands of each sensor.

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Figure 7: Uneven illumination across-track of LAPAN-A3 LISA Scene. (A) Visual evaluation for uneven illumination over LAPAN-A3 LISA's whole scene. Red line indicates the transect line for spectral profile drawn from west to east. (B) Spectral profile over the transect line (image credit: LAPAN)

• The LAPAN-A2 spacecraft and its payload are fully operational in February 2016. 7)

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Figure 8: LAPAN-A3 image of the Jember regency of the East Java province, acquired with MSI on 19 October 2016 (image credit: LAPAN)

• In October 2016, the LAPAN-A3 mission became operational after completing all in-orbit tests.

 


 

Sensor complement: (MSI, DSC, AIS)

Payload data handling: Source data up to 200 Mbit/s; 16 Gbit storage capacity; image frame's attitude and time tagging; CCSDS data packets.

 

MSI (Multispectral Imager)

MSI, also known as LISA (Line Imager Space Application), is a pushbroom 4-band imager for land use classification and environmental observations with the following features and capabilities:

- 300 mm lens

- 8002 x 4 pixel array

- 12 bit digitization

- Landsat filter for the bands: 0.45-0.52 µm (blue); 0.52-0.60 µm (green): 0.63-0.69 µm (red); 0.76-0.90 µm (NIR)

- Ground resolution = 18 m

- Swath width = 123 km

 

DSC (Digital Space Camera)

- A CCD imager with a 1000 mm lens

- 2000 x 2000 pixel array

- Ground resolution of 5 m

- Swath width = 10 km

 

AIS (Automatic Identification System) Receiver

The AIS instrument assembly is designed and developed at KSX (Kongsberg Seatex AS, Trondheim, Norway) supporting global maritime awareness by the reception of AIS signals from ships. The instrumentation is similar to the one flown on AISSAT-1 (launch on July 12, 2010). The AIS instrument features are:

• Simultaneous reception and decoding of any two channels in the maritime VHF band

• SDR‐based radio architecture – upgradeable after launch

• High sensitivity

• Low power consumption

• Industrial grade components used giving a cost‐efficient AIS payload

• RS422 interface.

- Sensitivity of 117 dBm

- Estimated footprint radius of 2800 km

- Max number of ships to be tracked: 104/min.

 


 

Ground segment:

LAPAN operates a network of ground stations to operate microsatellites (LAPAN-TUBSAT, LAPAN-A2 and LAPAN-A3/IPB). The network consists of ground station in Rumpin and Rancabungur (Bogor), Bukittinggi (West Sumatra), Pontianak (West Borneo)and Biak (Papua). Within the network, Rumpin is the main control station. In addition, as a research ground station, Rancabungur functions as backup for Rumpin, to ensure the reliability of Western Indonesia coverage. A LAPAN-built receiving antenna is installed in Bukittinggi, to cover the far Northwest of Indonesia such as the Aceh province. Another LAPAN-built receiving antenna is installed in Pontianak and Biak, to cover the satellite operation in the Central and Eastern part of Indonesia. In the future, another station will be established in Pare-pare, Celebes, to provide a better coverage of the central part of Indonesia.

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Figure 9: Ground station network of LAPAN-TUBSAT, LAPAN-A2 and LAPAN-A3 (image credit: LAPAN)

 


1) "LAPAN-IPB LISat satellite will be launched in the mid of 2016," April 2016, URL: http://news.ipb.ac.id/news/en/35683192358f11276ec9c2cb917ea7a9/
lapan-ipb-lisat-satellite-will-be-launched-in-the-mid-of-2016.html

2) Chusnul Tri Judianto, Eriko Nasemudin Nasser, "The analysis of LAPAN-A3/IPB satellite image data simulation using High Data Rate Modem," Elsevier, Procedia Environmental Sciences, Vol. 24, April 3, 2015, , pp: 285 – 296, URL: http://ac.els-cdn.com/S18780
2961500105X/1-s2.0-S187802961500105X-main.pdf?_ti
d=c9188b6c-1105-11e6-93b0-00000aacb35e&acdnat=1462262902_ffd
a5aaaa3dadb5545c37af85c60dfb7

3) Information provided by Robertus Heru Triharjanto of LAPAN.

4) HasbiWahyudi, Suhermanto, "Development of LAPAN-A3/IPB satellite - an experimental remote sensing microsatellite," Proceedings of 34th ACRS (Asian Conference on Remote Sensing), Bali, Indonesia,October 20-24, 2013

5) "PSLV-C34 Successfully Launches 20 Satellites in a Single Flight," ISRO, June 22, 2016, URL: http://www.isro.gov.in/update/22-jun-2016/ps
lv-c34-successfully-launches-20-satellites-single-flight

6) Z. Zylshal, N. M. Sari, J. T. Nugroho, D. Kushardono, "Comparison of Spectral Characteristic between LAPAN-A3 and Sentinel-2A," GSS 2017 (5th Geoinformation Science Symposium 2017), Yogyakarta, Indonesia, 27 – 28 September 2017, IOP Conference Series: Earth and Environmental Science, Volume 98, do i :10.1088/1755-1315/98/1/012051, URL: http://iopscience.iop.org/article/10.1088/1755-1315/98/1/012051/pdf

7) Information provided by Robertus Heru Triharjanto of LAPAN.
 


The information compiled and edited in this article was provided by Herbert J. Kramer from his documentation of: "Observation of the Earth and Its Environment: Survey of Missions and Sensors" (Springer Verlag) as well as many other sources after the publication of the 4th edition in 2002. - Comments and corrections to this article are always welcome for further updates (herb.kramer@gmx.net).

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