An Algorithm for Detection of Electromagnetic Interference in High Frequency Radar Range-Doppler Images Caused by LEDs

Nikola M Tosic,Dejan Drajic,Andreja Samcovic,Dejan Nikolic,Nikola Lekic

doi:10.1109/access.2019.2924532

Nikola M Tosic, Dejan Drajic + Show 3 more

Open Access

https://doi.org/10.1109/access.2019.2924532

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Abstract

This paper focuses on the impacts that noise generated by the light emitting diodes (LED) have on high-frequency surface wave (HFSW) radars. Initially, the measurements of the electromagnetic interference caused by the LED lights were conducted in an anechoic chamber, in order to eliminate the influences of other interference sources. It was determined that the most significant interference in the HF range is generated between 6 and 12 MHz. Next, the HFSW radar measurements in real field conditions were conducted at an operating frequency of 6.7 MHz. The LED influence on the HFSW radar was analyzed using the range-Doppler (RD) images. A novel algorithm based on the image segmentation and image processing methods for the automatic detection of the LED noise in the HFSW radar RD image is proposed. The proposed algorithm was experimentally validated using the data obtained from the HFSW radar sites located in the Gulf of Guinea. It was concluded that the proposed algorithm is capable of identifying and eliminating the noise originating from the LEDs with a probability of 91%.

Highlights

In recent years, light emitting diode (LED) panels are more widely used because they have a longer lifetime, smaller size and save more energy when compared to traditional incandescent bulbs
In this paper we described the method for detection of a specific type of noise (LED noise), by using a novel algorithm for processing an RD image of high-frequency surface wave (HFSW) radars
In this paper, we analyzed the influence of noise generated by LEDs and its effect on HFSW radar performance

Summary

INTRODUCTION

Light emitting diode (LED) panels are more widely used because they have a longer lifetime, smaller size and save more energy when compared to traditional incandescent bulbs. In order to improve LED efficiency, various types of switched inverter circuits were developed to drive LED panels and bulbs The downside to this is that they generate interference that can cause problems for many telecommunication devices at various frequency ranges. In paper [11] the authors used spatial characteristics of clutter in a planar array They proposed a new orthogonal projection method with eigenvalue decomposition. In this paper we described the method for detection of a specific type of noise (LED noise), by using a novel algorithm for processing an RD image of HFSW radars. Compared to other published algorithms/methods, the advantage of our proposed method is that it answers whether LED noise is present and based on this it more effectively performs image processing of an RD image (for this type of noise).

HFSW RADAR

Findings

CONCLUSION