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Radiolocator Design: Power Measurement and Digital Data Path

  • Danko Antolovic
Chapter

Abstract

In this chapter, we continue to follow the radiolocation signal through the data-collection stages: to power measurement and digitization of the power level, then onto gathering, formatting, and communication of radiolocation data to the supporting systems.

We are now at the stage where the signal has been downconverted to baseband frequency, and filtered to the desired radio channel. Provided that the received signal belongs to a valid wireless packet, a topic which we will take up in Chap.  6, we can be sure that we are detecting the transmission from one networking source, and one source only, and that radiolocation on the basis of this signal will give meaningful results.

Our power-measurement stage has, in its general design, a fairly typical real-time data-collection architecture: a sensor, in this case an integrated circuit measuring the average power of an AC signal, produces an analog reading of the sensory input after a fixed, known measurement time. The reading is digitized, also in real time, and raw data are grouped into meaningful units, in this case, readings of the same packet from all antennas, and sent off for higher-level processing. This higher-level step is the calculation of the packet’s direction of arrival (bearing); we discussed the algorithm in Chap.  2, and we will return to this algorithm’s timing aspects in Chap.  6.

Keywords

Power Measurement Automatic Gain Control Sampling Clock Crest Factor Sampling Capacitor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. Antolovic, D., Wallace, S. Single-Packet Radiolocation of 802.11 Wireless Sources, Using an Array of Stationary Antennas and High-Speed RF Multiplexing, ACM Proceedings of Wireless Internet Conference (WICON), Boston, MA (August 2006)Google Scholar
  2. Analog Devices. Data sheet for AD7492, http://www.analog.com/ (2001)
  3. Analog Devices. Data sheet for AD8362, Rev. D, http://www.analog.com/ (2003)
  4. Horowitz, P., Hill, W. The Art of Electronics, second edition, Cambridge University Press, Cambridge (1989)Google Scholar
  5. Jung, W.G. IC Op-Amp Cookbook, third edition, Prentice Hall, NJ (1997)Google Scholar
  6. Pilotte, M. Application Note AN-691 – Operation of RF Detector Products at Low Frequency, http://www.analog.com/, Analog Devices (2005)

Copyright information

© Springer-Verlag US 2010

Authors and Affiliations

  1. 1.University Information Technology ServicesIndiana UniversityBloomingtonUSA

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