[updated: March 2017]
NEXUS (Next Education ✕ Unique Satellite) is a 1U CubeSat developed by The Japan MASAT Association (JAMSAT) and our laboratory. JAMSAT developes the linear transponder and high speed transmitter, and our laboratory develops the bus system. You can see the detail of NEXUS at the web site of NEXUS and NEXUS Blog.
The bus system of NEXUS is based on the heritage of the technology used in SEEDS and SPROUT, but improved so as to fix the problems occured in SPROUT bus system. The mission of NEXUS is as follows:
- Demonstration of π/4 shift QPSK transmitter
- We will realize 38400bps downlink which is relatively faster than the downlink speed of conventional amateur CubeSats, and will provide to the CubeSat community.
- Demonstration of FSK tranceiver
- We will provide more stable and effective FSK transceiver.
- Operation of linear transponder
- We will operate the transponder which is desired by many amateur radio people (especially in Japan).
- Demonstration of small, multi-functional, and versatile camera system
- Combined with high speed transmitter, we will provide the subsystem that can downlink the photos with higher resolution than conventional ones.
The right figure illustrates the sequence of the operation of NEXUS. We are proceeding the end-to-end test of BBM, the determination of the specification and basic design of the satellite. NEXUS will be resistered as a repeater of JARL (Japan Amateur Radio League), and developed and operated by JARL, JAMSAT, and Nihon University.