AMSAT 發佈中國發射 Tianwang-1A Tianwang-1B Tianwang-1C 之消息

美國 AMSAT 發佈中國發射 Tianwang-1A Tianwang-1B Tianwang-1C 之消息


Beijing Launches Three More Amateur Radio Satellites


On September 25, 2015 at 01:41 UT Beijing launched three satellites with
amateur radio payloads from the Jiuquan Satellite Launch Center (JSLC)
in the
Gobi desert, Inner Mongolia. They were carried on a new launcher, Beijing’s
first solid-fuel rocket Chang Zheng 11 (CZ-11), and deployed in a 470 x
485 km,
97.3 degree inclination Sun Synchronous Orbit (SSO).

This launch occurred just over 5 days after nine satellites carrying amateur
radio payloads were launched by Beijing from the Taiyuan Satellite Launch
Center (TSLC) in Shanxi on September 19 at 23:01 UT.

The satellites were developed by students at the Nanjing University of
Aeronautics and Astronautics in collaboration with the Shanghai Engineering
Center for Microsatellites (SECM).

The main goal of the mission is to experiment with Software Defined Radio
(SDR) in space. The amateur radio payloads will be used for exchanging
Telemetry, Tracking and Command (TT&C) information with the amateur radio
ground control station. Information about the telemetry will be made
publicly
available so that radio amateurs around the world may track and monitor the
health of the satellites.

Other payloads include a video camera along with receivers for dual-band
GPS/Beidou, Maritime Automatic Identification System (AIS) and Aeronautical
Automatic Dependent Surveillance Broadcast (ADS-B).

Using MEMS based cold-gas micropropulsion it is planned to demonstrate
formation flying by two of the CubeSats along with inter satellite
communication using GAMALINK 2.4 GHz spread spectrum at 1 Mbps and the
CubeSat
Space Protocol (CSP).

The TW-1A and TW-1B CubeSats are 2U (20x10x10cm) in size while TW-1C is 3U
(30x10x10cm).

Michael Chen BD5RV reports the satellites have these downlinks in the
435-438
MHz ITU Amateur Satellite Service allocation:
• Tianwang-1A (TW-1A / SECM): Camera, 435.645 MHz GMSK 4800/9600 CSP TX
interval 10s
• Tianwang-1B (TW-1B / NJUST-2): AIS, 437.645 MHz GMSK 4800/9600 CSP TX
interval 20s
• Tianwang-1C (TC-1C / NJFA-1): ADS-B, 435.645 MHz GMSK 4800/9600 CSP TX
interval 10s
Note: TW-1A and 1C use the same frequency.

On the same launch was the technology demonstration satellite Pujian-1 which
has WiFi for intra-satellite communications.

Object identification from information supplied by Nico Janssen PA0DLO and
Zhang Xuan BH4DBE:
TW-1A object 40928, 2015-051B
TW-1B object 40927, 2015-051C, (other IDs: TianWang 1B, NJUST-2)
TW-1C object 40926, 2015-051D
Pujian 1 object 40925, 2015-051A
Chang Zheng 11 (CZ-11) fourth stage object 40929, 2015-051E

Keplerian Two Line Elements (TLEs) ‘Keps’ for new satellites launched in
past
30 days
http://celestrak.com/NORAD/elements/tle-new.txt

Shanghai Engineering Centre for Microsatellites
http://www.microsate.com/en/

GAMALINK in Space
http://tekevernews.blogspot.co.uk/2015/07/gamalink-in-space.html

IARU Satellite Frequency Coordination pages
http://amsat.org.uk/iaru/

Satellite tracking information
http://amsat-uk.org/beginners/satellite-tracking/

Adding new satellites to SatPC32, Gpredict and Nova
http://amsat-uk.org/2013/11/23/adding-new-satellites-to-satpc32/


[ANS thanks AMSAT-UK for the above information]


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2015-10-16

中國 紫丁香2号卫星无线电技术探秘

中國 紫丁香2号卫星无线电技术探秘

http://lilacsat.hit.edu.cn/?page_id=29


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2015-10-16