Design of GPS antijamming algorithm using adaptive array antenna to mitigate the noise and interference
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ORIGINAL RESEARCH
Design of GPS antijamming algorithm using adaptive array antenna to mitigate the noise and interference Rachna Kumari1 · Mainak Mukhopadhyay1 Received: 27 August 2018 / Accepted: 3 January 2019 © Springer-Verlag GmbH Germany, part of Springer Nature 2019
Abstract This paper describes the Matlab based simulation of radio frequency interference monitoring and mitigation techniques using adaptive array antenna and null steering algorithm. The proposed research is described to show the design and implementation of the GPS transmitter and receiver system for real time navigation, location based services and last but not least tracking applications. Two interferences arriving at 35° and 55° with power greater than seven times of original GPS signals arriving at 45°. Least mean square (LMS) and recursive least square (RLS) algorithms. The proposed system has been evaluated by conducting experiments by using the simulation tool for AntiJammer. The proposed model is useful for developing the smart health care application. Results showed better performance of RLS over LMS to mitigate the effect of interference as well as noise with a higher signal to noise ratio. This system will be useful for enhancing the communication effectiveness of smarthealth care systems. Keywords Adaptive array processing · Null steering · Jammer · Phase error · Global positioning system
1 Introduction Global positioning system (GPS) is an arrangement of few orbiting Geo satellites which give information of their position with exact time in space, on the other hand GPS receiver on earth receives the signals and calculates the position, speed, time of the system at that instance. A GPS system can be explained in three parts; a constellation of between 24 and 32 Solar Powered S Satellites(SPS) revolving around the Earth’s orbit at an altitude of approximately 20,000 km, a major control station and four control and monitoring satellites and a GPS Receiver on a vehicle/device on earth (Sameer and Joel 2003). A correlation operation is performed by the receiver using Delay Lock Loops (DLLs) to correlate GPS signal in form of incoming codesor bits sequence with identical codes generated by the receiver locally. The bit sequences are Gold codes formed * Rachna Kumari [email protected] Mainak Mukhopadhyay [email protected] 1
Department of Electronics and Communication Engineering, Birla Institute of Technology, Mesra, Deoghar Campus, Deoghar, Jharkhand, India
as a product of pseudorandom noise sequences (Spilker 1978). By analyzing the received and locally generated bit sequence, the receiver decides the pseudo range of each satellite (Getting 1993). When the analysis is being driven, the receiver clock time is compared to the satellite time of transmission to determine the pseudo range. The time of transmission from the satellite is encoded with bit sequence using the navigation data (Parthasarathy 2006). The escalated dependency on GPS for navigation, tracking and guidance has created a necessity for commensurate protec
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