Multi-ball and one-ball geolocation and location verification

D. J. Nelson; J. L. Townsend

doi:10.1117/12.2271698

1 May 2017 Multi-ball and one-ball geolocation and location verification

D. J. Nelson, J. L. Townsend

Proceedings Volume 10202, Automatic Target Recognition XXVII; 102020S (2017) https://doi.org/10.1117/12.2271698
Event: SPIE Defense + Security, 2017, Anaheim, CA, United States

Abstract

We present analysis methods that may be used to geolocate emitters using one or more moving receivers. While some of the methods we present may apply to a broader class of signals, our primary interest is locating and tracking ships from short pulsed transmissions, such as the maritime Automatic Identification System (AIS.) The AIS signal is difficult to process and track since the pulse duration is only 25 milliseconds, and the pulses may only be transmitted every six to ten seconds. Several fundamental problems are addressed, including demodulation of AIS/GMSK signals, verification of the emitter location, accurate frequency and delay estimation and identification of pulse trains from the same emitter. In particular, we present several new correlation methods, including cross-cross correlation that greatly improves correlation accuracy over conventional methods and cross- TDOA and cross-FDOA functions that make it possible to estimate time and frequency delay without the need of computing a two dimensional cross-ambiguity surface. By isolating pulses from the same emitter and accurately tracking the received signal frequency, we are able to accurately estimate the emitter location from the received Doppler characteristics.

Conference Presentation

Citation Download Citation

D. J. Nelson and J. L. Townsend "Multi-ball and one-ball geolocation and location verification", Proc. SPIE 10202, Automatic Target Recognition XXVII, 102020S (1 May 2017); https://doi.org/10.1117/12.2271698

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available