HDDM Hardware Evaluation for Robust Interference Mitigation

Abstract

Interference can significantly degrade the performance of global navigation satellite system (GNSS) receivers. Therefore, mitigation methods are required to ensure reliable operations. However, as there are different types of interference, robust, multi-purpose mitigation algorithms are needed. This paper describes the most popular state-of-the-art interference mitigation techniques. The high-rate DFT-based data manipulator (HDDM) is proposed as a possible solution to overcome their limitations. This paper presents a hardware implementation of the HDDM algorithm. The hardware HDDM module is integrated in three different receivers equipped with analog radio-frequency (RF) front-ends supporting signals with different dynamic range. The resource utilization and power consumption is evaluated for the three cases. The algorithm is compared to a low-end mass-market receiver and a high-end professional receiver with basic and sophisticated interference mitigation capabilities, respectively. Different type of interference are used to compare the mitigation capabilities of the receivers under test. Results of the HDDM hardware implementation achieve the similar or improved performance to the state of the art. With more complex interferences, like frequency hopping or pulsed, the HDDM shows even better performance.

Advanced and versatile signal conditioning for GNSS receivers using the high‐rate DFT‐based data manipulator (HDDM)

“…A method to address this limitation is to combine the HDDM with a simple notch filter. The HDDM and notch filter combination proved to be a good synergy in previous studies (Garzia et al, 2020b).…”

“…The HDDM takes this concept to the extreme by maximizing the overlap of each FFT. The performance benefits in interference mitigation also show it (Garzia et al, 2020b).…”

“…The HDDM algorithm was first introduced as a software implementation for interference mitigation (van der Merwe et al, 2020a) and later expanded to hardware-based interference mitigation (Garzia et al, 2020a(Garzia et al, , 2020b. Since then, other applications for the HDDM have also been investigated and demonstrated, such as spectrum compression and overlay-receiver designs (van der .…”

“…One aspect that plays an important role is the input bit width [which is related to the analog-to-digital converter (ADC) used in the platform] and has an impact on the interference mitigation capabilities. An evaluation of the interference mitigation performance for different bit widths is provided in Garzia et al (2020b).…”

“…An excerpt of previous research results is presented (Garzia et al, 2020b) to demonstrate the interference mitigation performance. Four interference signals are selected:…”