ZACube-2 Conceptual Layout

Following on the successes of ZACube-1, a.k.a. TshepisoSat, ZACube-2 is the second instalment in the Cape Peninsula University of Technology (CPUT) F’SATI mission series.

The satellite will serve as technology demonstrator for essential subsystems and form the basis on which an innovative Software Defined Radio (SDR) platform will be developed as primary payload. The SDR is highly flexible to address a wide range of communication needs and will be a test bed to validate vessel detection. Additionally, the satellite will feature a medium resolution imager as secondary payload to demonstrate the feasibility of future remote sensing applications such as ocean colour monitoring and large fire tracking.

This paper details the conceptual design and highlights the choices made around the proposed development
http://www.amsatsa.org.za/ZACube-2%20%20The%20successor%20to%20Africa%E2%80%99s%20first%20nanosatellite.pdf

Read the recent article by Hans van de Groenendaal ZS6AKV in EngineerIT magazine at
http://www.ee.co.za/article/cput-planning-successor-africas-first-nanosatellite.html

Southern African Amateur Radio Satellite Association (SA AMSAT) http://www.amsatsa.org.za/

ZACUBE-1, FUNcube-1 and HiNCube in the deployment pod – Image credit Wouter Weggelaar PA3WEG

The South African CPUT TshepisoSAT team were invited to give a mission update at the SA AMSAT‘s Space Symposium on Saturday, May 24, 2014 at the Innovation Hub in Pretoria.

The event was well attended and even had representatives from SANSA in attendance. Presentations on other CubeSats included Denel Dynamics’ DynaCube, FUNcube-1 and SA AMSAT’s own KLETSkous project.

This paper gives a brief introduction to the F’SATI programme, the constructed CubeSat and mission. An outline of the milestones reached thus far with the Tshepiso nano-satellite are given, the outstanding activities that must still be completed and challenges faced. Some of the images captured by the satellite are also presented. Read TshepisoSAT, six months on orbit.
http://www.cput.ac.za/blogs/fsati/files/2014/05/Paper-SA-AMSAT-Space-Symposium-Pretoria-2014.pdf

CPUT F’SATI News http://www.cput.ac.za/blogs/fsati/blog/

Southern African Amateur Radio Satellite Association (SA AMSAT) http://www.amsatsa.org.za/

ZACUBE-1, FUNcube-1 and HiNCube in the deployment pod – Image credit Wouter Weggelaar PA3WEG

The amateur radio ZACUBE-1 satellite, launched with FUNcube-1 on November 21, 2013, recently had two close encounters with space debris. The ZACUBE-1 team have issued this press release:

CPUT ZACUBE-1 TshepisoSat

Week nine of the year will go down as quite an eventful week for ZACUBE-1 (TshepisoSat), literally dodging two bullets involving speeds in the kilometres per second range.

The first close approach notification arrived the morning of 25 February 2014 from the United States Joint Space Operations Center (JSpOC) through the The South African National Space Agency (SANSA) (A close approach notification is generated by the JSpOC to warn spacecraft operators when their spacecraft will come in close proximity to another object). The first order of business was the identification of the other object. In this case “SCC# 21422″. Our dance of death would be with the, now defunct, 2000 kg Russian built COSMOS 2151 launched in 1991. As ZACUBE-1 carries no propulsion system and with the COSMOS 2151 no longer functioning the only course of action was to closely monitor the situation.

TShepisosat ZACUBE-1 prior to being shipped to the Netherlands

It was determined that the close approach event would occur over the Antarctic and a search was started for possible ground stations that could listen for signals from ZACUBE-1 directly after the event. Help arrived in the form of our friends from the California Polytechnic State University in San Luis Obispo, California, United States. The Cal Poly ground station would see ZACUBE-1 approximately 30 minutes after the event and be able to listen for its transmitted telemetry beacon signal. In preparation ZACUBE-1 would be tracked and checked on the last two passes over South Africa (22:50 SAST 26/02/2014 and 00:26 SAST 27/02/2014) a few hours before the event to ensure that everything was OK and then again by the Cal Poly station.

With everything checking out and all systems nominal on the last pass over South Africa all we could do was wait for news from California.

Great success! With Cal Poly confirming that ZACUBE-1 was alive and well. We were able to further confirm this on the first pass over South Africa.

ZACUBE-1 TshepisoSat HF beacon antenna deployment unit – Image credit CPUT

This would have been enough excitement for the week, but soon after verifying that ZACUBE-1 was OK we received our second close approach notification! This time involving a piece of debris from a METEOR 2-5 satellite. The plan would be much the same, but with the event taking place over Brazil we tried to make contact with some stations in Brazil. Unfortunately nothing was heard over Brazil, but we received notification of ZACUBE-1′s signal from the University of Florida and again from the California Polytechnic State University.

We would like to thank everyone that helped out during this time, hopefully I did not leave anybody out. The folks from Cal Poly, University of Florida, the Brazilian radio amateurs that tried on very short notice and SANSA.

ZACUBE-1 carries a UHF beacon on 437.345 MHz and an HF beacon on 14099 kHz used to characterise the Superdarn antennas at the Antarctic which study the ionosphere.

ZACUBE-1 information
http://www.cput.ac.za/fsati
and
http://www.amsatsa.org.za/

First image captured by TshepisoSat (ZACUBE-1)
https://amsat-uk.org/2013/12/15/first-image-captured-by-tshepisosat-zacube-1/