The Electronic System Design, Analysis, Integration, and Construction of the Cal Poly State University CP1 CubeSat

Abstract

Picosatellites demand highly efficient designs. Restricted in mass, volume, and surface area, the design of these spacecraft is particularly challenging. The electronic systems of CP1, the first satellite developed at Cal Poly State University, are designed specifically with simplicity and efficiency in mind. The satellite’s design conforms to the CubeSat standard, also developed at Cal Poly in conjunction with Stanford University. Designed and built by Cal Poly Students, the main printed circuit board (PCB) is the center of the electronic systems of CP1. This PCB incorporates the command, data handling, data acquisition, and power electronic systems. The bus systems of CP1 are designed to accommodate numerous commercial payloads. Highly efficient bus systems allow 30% of the spacecraft’s mass, volume, and power to be budgeted for payloads. This capable platform can be used to develop and flight test numerous new technologies such as microthrusters, magnetorquers, MicroElectro-Mechanical Systems (MEMS), and a variety of sensors. This paper outlines the objectives and requirements of the mission and describes how those requirements are met in the design. The integration of the electronics with the structure and primary payload, as well as the fabrication and assembly methods employed, and modifications for in-orbit operations are covered. Additionally, the design is analyzed to determine potential weaknesses in functionality or reliability and test results are presented to provide a characterization of the electrical and functional properties of the spacecraft.