Optimal anti-jam attitude determination using the global positioning system

This paper develops the mathematical basis for a GPS based attitude determination (AD) system that performs even in the presence of strong external interference. This is accomplished by approaching the AD problem from an antenna array viewpoint and using phase and amplitude information, vice using only phase information as in "conventional" AD systems. By redefining the array response vector used in array processing, a Maximum Likelihood Attitude Estimator (MLAE) is developed. This paper shows that the MLAE is a consistent estimator, and its performance asymptotically achieves the Cramer-Rao Bound. Simulation based performance results of the MLAE are presented for various antenna topologies and interference scenarios, showing that it offers a significant improvement over the conventional attitude determination methods.

[1]  Jian Li,et al.  Computationally efficient angle estimation for signals with known waveforms , 1995, IEEE Trans. Signal Process..

[2]  E. Sutton,et al.  An Antenna Array-Based Approach to Attitude Determination in a Jammed Environment , 2001 .

[3]  Elliott D. Kaplan.  Understanding GPS : principles and applications , 1996 .

[4]  Petre Stoica,et al.  MUSIC, maximum likelihood and Cramer-Rao bound: further results and comparisons , 1989, International Conference on Acoustics, Speech, and Signal Processing,.

[5]  Michael S. Braasch,et al.  GPS Interferometric Attitude and Heading Determination: Initial Flight Test Results , 1991 .

[6]  Mark A. Wickert,et al.  Direct-Sequence Spread-Spectrum Using Directionally Constrained Adaptive Beam Forming to Null Interference , 1995, IEEE J. Sel. Areas Commun..

[7]  Jian Li,et al.  Maximum Likelihood Angle Estimation For Signals With Known Waveforms , 1991, Proceedings of the Seventh Workshop on Multidimensional Signal Processing.

[8]  K.M. Buckley,et al.  A blind adaptive antenna array for CDMA systems , 1995, Conference Record of The Twenty-Ninth Asilomar Conference on Signals, Systems and Computers.

[9]  Matthew David Markel.  Interference mitigation for GPS based attitude determination , 2002 .

[10]  Petre Stoica,et al.  MUSIC, maximum likelihood and Cramer-Rao bound , 1988, ICASSP-88., International Conference on Acoustics, Speech, and Signal Processing.

[11]  Petre Stoica,et al.  Introduction to spectral analysis , 1997 .