Cute-1.7 + APD Laboratory for Space Systems

Cute-1.7 + APD II Project - Overview -

Small Satellite Program (SSP)

Laboratory for Space Systems (LSS), Tokyo Institute of Technology

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"Cute-1.7 + APD II" is a follow-on satellite to the "Cute-1.7 + APD," and much improvements will be conducted in many components of "Cute-1.7 + APD II", in particular, for amateur communications system, camera system, APD sensor and so on, based on the experiences acquired in the development and operation of "Cute-1.7 + APD." The followings are to be improved.

  1. Design with radiation tolerance. Each microcomputer which has possibility of SEL related trouble is installed with a current limitation circuit.
  2. Structural design that can decrease time required to assemble in order to achieve a lot of integration tests. The equipment arrangement to be able to facilitate the assembly is achieved.
  3. The power generation of the solar cell is improved. The operations had been delayed because of the electric power shortage. To improve this, the size of the satellite is to be 20cm*15cm*10cm for the power generation of solar cells to be increased.

The launch of "Cute-1.7 + APD II" is planned to summer in 2007.

About Cute-1.7 + APD

Cute-1.7 + APD project is a satellite development project mainly by students at Laboratory for Space Systems, Tokyo Institute of Technology. The Avalanche Photo Diode sensor module, or APD, embarked on this nano-satellite was also developped by the Tokyo Institute of Technology Kawaii Laboratory.
To launch our satellite in 2006, the project has started in January, 2004. Our satellite, named Cute-1.7 + APD, is 200mm x 100mm x 100mm in size. It became the second satellite made in Tokyo Institute of Technology after the first one, CUTE-I, which was launched in June, 2003.
This project is based on the international CubeSat project.

"Cute-1.7+APD"-#1 was launched into orbit as a subpayload of the JAXA M-V-#8 Rocket in february 2006. The separation mechanism for release in orbit was also developped at the Tokyo Institute of Technology Matunaga Laboratory for Space System. It is based on the TSD(Tokyo-Tech Separation System Demonstration) experiment regarding CUTE-I.
The orbit of "Cute-1.7 + APD " is 250-280km in perigee height and 750km in apogee height, so lifetime of "Cute-1.7 + APD " is estimated much less than two year for the shortest due to atmospheric reentry. The exact lifetime is dependent on the actual rocket flight condition and atmospheric density.

The web site will be updated as progress is made on the development of this project.

The Goals of This Project

To facilitate future microsatellite development by demonstrating a new design methodology. To share experiment opportunities using real satellite with space engineering enthusiasts.

Project Overview PowerPoint(Created at 2004-01-25, subject to change)
Mission Scenario PowerPoint(in Japanese)
Details of Simple Radio Link Layer

Amateur radio satellite

Amateur Frequency Use

Cute-1.7 + APD project team proposes using an amateur radio frequency for communication between the satellite and its ground station. We will operate our satellite, recognizing that radio-frequency spectrum is a precious finite resource and that an amateur satellite should be operated for the purposes stated in IARU's guidlines, that is

  1. To provide communication resources for the general amateur radio community and/or
  2. To conduct technical investigations in all respects consistent with the Radio Regulations.

About Cute-1.7 + APD's digipeater with store-and-forward functionality.

Frequency coordination for Cute-1.7 + APD project was completed by IARU at December 5, 2004. Cute-1.7 + APD will use:

Papers and Presentations

Public Relations

Why 1.7?

The name of this project is Cute-1.7 + APD Project. You might think 'CUTE-II' seems suitable for the name of the second project after CUTE-I project. But when a new idea of this project came up, there already existed CUTE-II project in progress, where a satellite will be larger and its launch date will be later. Because this project expected earlier launch date than CUTE-II, a number greater than one and less than two was needed. It was finally named as Cute-1.7 + APD, one with a lucky number seven.



Your comments and suggesti?ns are welcome, please write to:
Masafumi Iai, Cute-1.7 Project Manager

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