TID testing and SEE mitigation approach of a long mission life GPS receiver using COTS parts

Abstract

Compared to conventional hardware GPS receivers (GPSR), software GPS receivers are more suitable for research and development. Software GPS receivers can be dynamically programmed in software to reconfigure the characteristics of GPS receiver and new algorithms can easily be integrated without changing the design of the hardware. However, the most important issue for this approach is the computational load. It can be solved by using the high performance state-of-art digital signal processor. The harshness of space environment, such as Total Ionizing Dosage (TID), Single Event Effect (SEE), always cast certain thread to GPS receiver intended for space applications. Common resolution to cope with this thread is the robustness of space grade EEE parts toward those effects along with the protection of circuit design. Nevertheless, the most of the state-of-art EEE parts are not space qualified. In this study, certain Commercial Off The Shelf (COTS) parts such as COTS level RF Front-End (RFFE) and Digital SignalProcessor (DSP) along with single event effect (SEE) mitigation circuit design, are considered in the proposed GPSR design for their advantages, such as availability, performance, size, weight and lead time, over regular space qualified ones.

A low cost GNSS software receiver design with SEE mitigation approach for microsatellites

“…The design of SEL free circuit will not enable power until power supply voltage is lower than certain threshold. Many Space agencies have been working for mitigating the SEE effects in their satellite design.The following shows the test results of this design conducted by [14] at the radiation test chamber of the Nuclear Science and Technology Development Center at National Tsing Hua University(Taiwan) equipped with 2 Co-60 dry stored rod sources (radiation strength ratio is around 30). A system Fig.…”

From GPS Receiver to GNSS Reflectometry Payload Development for the Triton Satellite Mission

“…In addition to the performance test, the environmental tests are essential to verify that the NSPO GPSR is compliant with its specification and is ready to fly with LEO missions. The NSPO GPSR has passed the entire qualification test campaign, undergoing such tests as a thermal cycle test, a vibration test, a thermal vacuum test, an electromagnetic compatibility (EMC) test, and a radiation test [15].…”