Abstract
This work describes a system-level overview of a multi-frequency GBSAR built around a high performance software defined radio (SDR). The main goal of the instrument is to be employed as a demonstrator and experimental platform for multi-frequency GBSAR campaigns. The system is capable of operating in P, L, C and X-bands, and signal generation and digital signal processing are customizable and reconfigurable through software. An overview of the software and hardware and implementations of the system are presented. The operation of the system is demonstrated with two measuring campaigns showing focused amplitude images at different frequencies. It is shown how the usage of SDR for GBSAR systems is a viable design option.
Highlights
Software defined radar (SDRadar) has gained attention in the past few years
software defined radio (SDR) architecture can be exploited for the implementation of high performance radars, especially a ground based synthetic aperture radar (GBSAR)
From other works, this work demonstrated the implementation of a GBSAR comparable in performance to other commercial systems
Summary
Software defined radar (SDRadar) has gained attention in the past few years. SDRadar is a relatively new paradigm that arose from the natural evolution of radar system design. This work is centered on the use of SDRs for a multi-frequency software defined ground based synthetic aperture radar (GBSAR). The advantages of GBSARs over airborne or space-borne systems are: continuous and time-critical monitoring, ease of deployment, favorable geometrical configuration of the measurement in some situations, simpler data processing and lower cost. Their main disadvantage is their limitation to the imaging of much smaller areas. The VNA provided flexibility and a ready-to-use device to implement the radar core Those systems were bulky, extremely expensive due to the high cost of the VNA and suffered from a slow scanning time.
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