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Post Info TOPIC: ALOS Delay
Blobrana


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Posts: 131433
Date:
Leyte Island
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The Japan Aerospace Exploration Agency (JAXA) has acquired images of Leyte Island in the Republic of the Philippines, where a huge landslide occurred on February 17, using the Phased Array type L-band Synthetic Aperture Radar (PALSAR) onboard the Advanced Land Observing Satellite "Daichi."


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The image were observed and taken by the PALSAR around 10:50 a.m. on February 24 (Japan Standard Time, JST) as part of the initial functional test for the "Daichi."


After being analysed by JAXA, images have been provided to the following organisations.

International Charter "Space and Major Disasters"
Asian Disaster Reduction Centre (ADRC)

-- Edited by Blobrana at 11:52, 2006-02-25

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Blobrana


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Posts: 131433
Date:
Daichi Images
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The Japan Aerospace Exploration Agency (JAXA) has announced that image data was successfully acquired by the Advanced Visible and Near Infrared Radiometer type-2 (AVNIR-2) onboard the Advanced Land Observing Satellite "Daichi". The data was acquired as part of the initial functional verification test.


Credit JAXX

The image of the Tanegashima area was observed by the AVNIR-2 at 10:50 a.m. on February 17 (JST), and later received at the Earth Observation Centre (in Hatoyama-cho, Hiki-gun, Saitama Pref.)


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The colour of the image is close to what the human eye can see, and the spatial resolution is 10 meters. One can identify sand beaches and shallows along the seashores, vegetation and buildings. The Takesaki Observation Deck in Minami-tane cho and the Osaki Launch Complex from which the H-IIA Launch Vehicle will be launched tomorrow are also clearly seen.


The Daichi is the only satellite that can perform high resolution observations of one specific area with both light and radio frequency by using both the Advanced Visible and Near Infrared Radiometer type 2 (AVNIR-2) and the Phased Array type L-band Synthetic Aperture Rader (PALSER) simultaneously. Through this ability, it can identify the earth's surface more precisely.

-- Edited by Blobrana at 18:55, 2006-02-17

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Blobrana


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Posts: 131433
Date:
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The Japan Aerospace Exploration Agency (JAXA) has announced that image data was successfully acquired by the Panchromatic Remote-sensing Instrument for Stereo Mapping (PRISM) onboard the Advanced Land Observing Satellite "Daichi,". The data was acquired as part of the initial functional verification test.

Images of Mt. Fuji and Shimizu Port in Shizuoka Prefecture were both observed by the PRISM at 10:30 a.m. on Feb. 14 (JST), and later received at the Earth Observation Centre (in Hatoyama-cho, Hiki-gun, Saitama Pref.)
This sensor can acquire high-resolution three directional 3-D data, marking a world first for an earth observation satellite data.

They will release more image acquisitions by the Advanced Visible and Near Infrared Radiometer type 2 (AVNIR-2) and the Phased Array type L-band Synthetic Aperture Rader (PALSER) as soon as they are performed.

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The image data of Mt. Fuji was observed by the Panchromatic Remote-sensing Instrument for Stereo Mapping (PRISM) onboard the Advanced Land Observing Satellite "Daichi" during the daytime (around 10:30 a.m.) on Feb. 14, 2006 (JST). The height of the mountain was calculated based on backward, nadir and forward view images shown on the right, then the bird’s–eye picture was compiled by overlapping the nadir view image. You can see detailed streets and rivers in the Kofu Basin in the front in the image, Motosu Lake in the centre right, and Fuji-Subaru Road that leads to the snow capped top of Mt. Fuji from Motosu Lake. The height is indicated twice as much in this bird’s-eye picture.


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The image data of Shimizu Port near Shizuoka city was observed by the Panchromatic Remote-sensing Instrument for Stereo Mapping (PRISM) onboard the Advanced Land Observing Satellite "Daichi" during the daytime (around 10:30 a.m.) on Feb. 14, 2006 (JST). The area of Shimizu Port was enlarged from the nadir view image on the left.
In the image taken by the PRISM, (in the red box) whose spatial resolution is 2.5 metres, ships at the port, boats in the yacht harbour, cars on the roads, Shimizu station on the JR Tokai Railway line, and houses, can be seen.

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Blobrana


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Posts: 131433
Date:
Daichi Problem
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The Japan Aerospace Exploration Agency (JAXA) has been carrying out the initial functional verification of the Daichi since January 28 following its launch on January 24, 2006 (Japan Standard Time).

JAXA has so far found a problem where part of the data is lost because the synchronicity between the satellite and the receiving/demodulation system on the ground has been out of sync every once in a while during direct transmission(*1) to the JAXA Earth Observation Centre (in Hatoyama, Saitama) from the Daichi.

Data transmission is currently performed mainly via the data relay engineering satellite "Kodama." However, they plan to acquire initial image data from the Daichi by direct transmission without using the
Kodama.

Therefore, today, JAXA set up a cause investigation team as part of the initial functional verification operations to study the situation comprehensively including both satellite and ground systems.

They will report more as soon as they find the cause of the problem.

All other parts of the satellite are stable, and the initial functional verification operations are being carried out as scheduled.

(*1) The direct transmission is scheduled to go not only to our earth observation centre but also to other related organizations who have their own receiving facilities.

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Blobrana


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Posts: 131433
Date:
Daichi
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The Japan Aerospace Exploration Agency (JAXA) confirmed that the Daichi is in a stable condition after its attitude control was successfully shifted from thruster-controlled mode to wheel mode at 10:07 p.m. on January 27, 2006 (Japan Standard Time, JST).
However, at 10:51 p.m. on the 27th (JST) an anomaly detection function was activated for the data processing system and the Daichi consequently put itself into safety mode.
They are currently investigating the status and cause, but other conditions such as the attitude of the Daichi are stable.
To investigate the cause of the activation of the anomaly detection, they decided to continue the critical phase of the Daichi and take all possible measures to return to normal operations. they will restore the data processing system first, then will complete the critical phase in order to move to the initial functional verification phase after we confirm that the satellites operations can be stably performed.

* The critical phase is the period until the satellite is ready for the initial functional verification. It includes launch operations, deployment of solar array paddle, communication antenna, and radar antenna after the separation from the launch vehicle, and completion of shifting to the regular mode of the attitude control system.



The Japan Aerospace Exploration Agency (JAXA) confirmed that there was no problem in the data processing function of the Daichi, thus they carried out operations to have the Daichi return to normal operations until 11:54 a.m. on January 28, 2006 (Japan Standard Time, JST.)
Subsequently, JAXA monitored the satellite conditions, and verified that all functions of the satellite, including the data processing system, are working normally and returned to regular operations.
As we previously announced, the Daichi had put itself into safety mode automatically because the anomaly detection function had been activated at 10:51 p.m. on January 27 (JST).

JAXA then decided to complete the scheduled critical phase at 5:00 p.m. on January 28 (JST), and moved onto the initial functional verification phase.

They will now verify the functions of the satellite onboard equipment for about three months until April.

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Blobrana


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Posts: 131433
Date:
Daichi Deployment
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The Japan Aerospace Exploration Agency (JAXA) started the deployment of the Antenna for the Phased Array Type L-band Synthetic Aperture Radar (PALSAR) from 10:23 a.m.(Japan Standard Time, JST), and confirmed that it had been successfully completed through telemetry data received at 12:09 p.m.(JST.)
PALSAR deployment images are shown in the attached sheets.

All deployments of paddle and antennas of "Daichi" (ALOS) had been successfully completed.
The satellite is in a stable condition.

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Blobrana


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Posts: 131433
Date:
Daichi
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The Japan Aerospace Exploration Agency (JAXA) started the deployment of the Data Relay Satellite Communication Antenna (DRC) of the Daichi from 9:37 a.m., January 25 (Japan Standard Time, JST), and confirmed that it had been successfully completed through telemetry data received at 9:44 a.m. January 25 (JST).

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Blobrana


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Posts: 131433
Date:
ALOS ADEN
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ESA is supporting ALOS as a 'Third Party Mission', which means the Agency will utilise its multi-mission ground systems of existing national and industrial facilities and expertise to acquire, process and distribute data from the satellite.
Based on a Memorandum of Understanding with JAXA, approved at ESA Council in December and now ready for signature, ESA will host the ALOS European Data Node (ADEN), delivering near-real time and offline data to scientific and operational users across Europe as well as Africa.

Read More

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Blobrana


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Posts: 131433
Date:
Daichi Orbit
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Orbit Calculation Results for the Advanced Land Observing Satellite "Daichi" (ALOS)
January 24, 2006 (JST)

The Japan Aerospace Exploration Agency (JAXA) confirmed orbit details for the Advanced Land Observing Satellite "Daichi," which JAXA launched on the H-IIA Launch Vehicle No. 8 from the Tanegashima Space Center at 10:33 a.m. on January 24, 2006 (Japan Standard time, JST.)
The following are the orbit calculation results. The satellite is now in a stable condition.


  	           Actual value 	Scheduled value
Apogee altitude    	711.4km 	(709.8Km)
Perigee altitude 	692.9km 	(692.5Km)
Inclination 	        98.2degrees 	(98.2degrees)
Period 	                98.8minutes 	(98.8minutes)


Source JAXA

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Blobrana


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Posts: 131433
Date:
Daichi
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The Japan Aerospace Exploration Agency (JAXA) confirmed that the sun tracking for the satellite solar array paddle (PDL) of the Daichi is normal through signals received from the Daichi at the Perth station
in Australia. Its power generation is also normal. The station started receiving the signals at 12:31 a.m. (Japan Standard Time, JST) at the time of the revolution.


Credit JAXA


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