Implementation of Base Line Interferometry Algorithm for Direction Finding

Authors

  • Medempudi Sri Padma department of electronics and communication engineering, GITAM University, Visakhapatnam, Andhra Pradesh-530009, India
  • U. Ratna Kumari department of electronics and communication engineering, GITAM University, Visakhapatnam, Andhra Pradesh-530009, India
  • J. Vijayalakshmi Defence Electronics, Research Laboratory (DLRL), Ministry of Defence, Govt. of India Chandrayangutta lines, Hyderabad-500005, India

DOI:

https://doi.org/10.37591/rrdms.v2i2.427

Keywords:

Electronic warfare (EW), intermediate frequency, direction of arrival (DOA), base line interferometer

Abstract

The Electronic Warfare (EW) receiver aims to intercept the Radar signal and analyze its characteristics like Frequency, Pulse Width (PW), Pulse Repetition Interval (PRI), Amplitude and also its Direction of Arrival (DOA). The Radar signal is in the range of 0.5 to 40 GHZ this will be down converted using super-heterodyne receiver as front end. The Intermediate Frequency (IF) from front end in the range of 750 to 1250 MHZ forming the input to the digital receiver .The IF is digitalized using Analog to Digital Converter (ADC) and processed
using FPGA in the digital receiver by implementing FFT, to extract the parameters like Frequency, Amplitude, pulse width, PRI. The DOA is computed based on Base Line Interferometer (BLI) technique. In this four channels are used to extract the DOA. The BLI technique implemented in FPGA provides very fine DF accuracy in order of less than one degree RMS. The algorithm will be tested in real time for signals like Pulse, CW, Chirp, FM CW, Phase Coded Radar signals.

Cite this Article
Medempudi Sri Padma, U. Ratna Kumari, J. Vijayalakshmi. Implementation of Base Line Interferometry Algorithm for Direction Finding. Research & Reviews: Discrete Mathematical Structures. 2015; 2(2): 21–24p.

References

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Kendall W.B. Unambiguous Accuracy of an Interferometer Angle Measuring System. IEEE Transactions: Space Electronics and Telemetry, SET. 1965; 11: 62–70p.

Jacobs. E. And Ralston W.E. Ambiguity Resolution in Interferometry. IEEE Transactions: Aerospace and Electronic Systems, AES. 1981; 17: 766–779p.

Dybdal. R.B. Mono pulse Resolution of Interferometric Ambiguities. IEEE transactions: Aerospace and Electronic Systems, AES. 1986; 22: 177–183p.

Horner D.W. Specifications, Calibration and Testing of Phase Interferometers. Microwave Journal. 1988: 139–155p.

Jacobs I and Ralston E. Ambiguity Resolution in Interferometry. IEEE AES. 1981.

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Published

2015-06-29

Issue

Vol. 2 No. 2 (2015)

Section

Review Articles

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