Abstract
The functional performance of space-borne instruments must be validated on ground before and after satellite integration. The effects of radio-frequency interference are also becoming more important, even in protected bands for earth observation. In this article, a GNSS and GNSS-R signal simulator is developed as part of a testbed of GNSS receivers and GNSS-R payloads' performance in high dynamics, and to study the effects of RFI in the GNSS-R observables. This article describes the different concepts and key enabling techniques that have been developed to support this project.
Highlights
I N SPACEBORNE applications, the validation of flight instrumentation is critical to ensure mission success
A high dynamics environment was used in the testbed to demonstrate realistic scenarios encountered while testing space-borne Global Navigation Satellite System (GNSS)-R payloads. These scenarios include the computation of GNSS-R observables such as delay-Doppler map (DDM) and the characterization of the effects of radiofrequency interference (RFI) on GNSS-R observables, similar to the ones found in TDS-1
Introducing a continuous waves (CWs) signal corrupting the simulated reflection causes vertical glitches, as shown in Fig. 10(b), making it impossible to extract any physical parameter from the characteristics of the DDM
Summary
I N SPACEBORNE applications, the validation of flight instrumentation is critical to ensure mission success. Earth Observation (EO) techniques using Global Navigation Satellite System (GNSS) signals of opportunity such as GNSSReflectometry (GNSS-R) are gaining popularity in the recent years. These techniques are difficult to test due to the high cost of GNSS simulators, forcing in many cases to launch non-properly tested instruments, which may cause a failure of the entire mission. The testbed consists of a signal generator that can synthesize either the direct or the reflected GNSS signals, which are transmitted using a software-defined radio (SDR). These signals are fed into the systems under test, allowing for the validation of the implementation and its performance. In order to test the complete system, from signal generation to the effects of RFI in the recovered signals, a hardware-in-the-loop testbed has been developed, and the results
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