Boots – shoes – and leggings
Patent
1997-09-22
1999-04-06
Mai, Tan V.
Boots, shoes, and leggings
G06G 700
Patent
active
058927000
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Method for the high-resolution evaluation of signals for one- or two-dimensional directional or frequency estimation.
The invention relates to a method for the high-resolution evaluation and, if appropriate, for the recovery of received narrow-band signals for one- or two-dimensional directional estimation. The invention also relates to a method for the high-resolution evaluation of superimposed, non-attenuated harmonic signals for one- or two-dimensional frequency estimation in the case, if appropriate, of multi-channel observations.
One- or two-dimensional methods for evaluating the direction of incidence of the different signals are known from R. Roy and T. Kailath, "ESPRIT--Estimation of signal parameters via rotational invariance techniques", IEEE Trans. Acoust., Speech, Signal Processing, vol. ASSP-37, pp. 984-995, July 1989 and A. L. Swindlehurst and T. Kailath, "Azimuth/elevation direction finding using regular array geometrics", IEEE Trans. Aerospace and Electronic Systems, Vol. 29, pp. 145-156, January 1993.
Methods for one-dimensional or two-dimensional frequency estimation in the case of single-channel observations are known from R. Roy, A. Paulraj and T. Kailath, ESPRIT--A subspace rotation approach to estimation of parameters of cisoids in noise", IEEE Trans. Acoustics, Speech, Signal Processing, Vol. ASSP-34, p.1340-1342, October 1986 and M. P. Pepsin and M. P. Clark, "On the performance of several 2-D harmonic retrieval techniques" in Proc. 28th Asilomar Conference on Signals, Systems and Computers", Pacific Grove, Calif., November 1994.
Because of their simplicity and their power of resolution, the methods, known as ESPRIT methods, for signal parameter estimation by techniques based on displacement invariances (denoted below as Standard ESPRIT methods) are suitable for directional or frequency estimation. In the case of directional estimation, displacement invariances signify the geometrical displacement of identical sensor subgroups, and in the case of frequency estimation the time-referred displacement of the equidistant sample value divided into subgroups. However, complex calculations involving a relatively high outlay on computation are generally required in the Standard ESPRIT method. Again, with rising correlation between the signals, the standard ESPRIT method loses in accuracy and cannot cope in the case of coherent signals. In the case of two-dimensional directional evaluation, all known methods for the high-resolution directionally sensitive evaluation of signals require optimization or search strategies which are expensive in terms of computing time for the purpose of assigning the signals the spatial coordinates determined in the two dimensions. Furthermore, the reliability of the known methods cannot be estimated, and thus no automatic improvement in the recording of measured values can be instituted in the presence of unsatisfactory reliability.
Directional evaluation is opening up a new field of application for itself with mobile radio or methods resembling mobile radio. When being propagated in a propagation medium, signals are subject to interference owing to noise. Owing to instances of diffraction and reflection, signal components traverse different propagation paths and overlap one another at the receiver, and lead to their extinction effects. Furthermore, instances of overlapping of the signals occur in the case of a plurality of signal sources. Among other methods, frequency division multiplex and time division multiplex methods or a method known as code division multiplex serve the purpose of facilitating the distinguishing of signal sources and thus of evaluating the signals.
SUMMARY OF THE INVENTION
It is the object of the invention to specify a method for the high-resolution evaluation of signals for one- or two-dimensional directional or frequency estimation, which can be carried out with reduced computational outlay and an increased accuracy of resolution. This object is achieved by the inventive method for the high-resolution ev
REFERENCES:
patent: 4353119 (1982-10-01), Daniel et al.
patent: 4750147 (1988-06-01), Roy, III et al.
patent: 4910526 (1990-03-01), Donnangelo et al.
patent: 4965732 (1990-10-01), Roy, III et al.
patent: 5299148 (1994-03-01), Gardner et al.
patent: 5359333 (1994-10-01), Withers, Jr.
patent: 5459668 (1995-10-01), Dogan et al.
IEE Proceedings-F, vol. 139, No. 4, Aug. 1992, Y.H. Chen et al, Direction-of-arrival and frequency estimations for narrowband sources using two single rotation invariance algorithms with the marked subspace, pp. 297-300.
IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP 33, No. 4, Aug. 1985, Tie-Jun Shan, et al, On Spatial Smoothing for Direction-of-Arrival Estimation if Coherent Signals, pp. 806-811.
IEEE (1995) Conference Record of the 28th Asilomar Conference on Signals, Systems & Computers, M.D. Zoltowski et al, Closed-Form 2D Angle Estimation With Rectangular Arrays Via DFT Beamspace ESPRIT, pp. 682-687.
IEEE (1994) ICASSP Proceedings in 6 Volumes, M. Haardt et al, Unitary ESPRIT: How to Exploit Additional Information Inherent in the Rotational Invariance Structure, pp. 229-232.
IEEE (1986) Transactions on Acoustics, Speech, & Signal Processing, vol. ASSP-34, No. 5, R. Roy et al, ESPRIT--A Subspace Rotation Approach to Estimation of Parameters of Cisoids in Noise, pp. 1340-1342.
IEEE Transactions on Aerospace and Electronic Systems, vol. 29, No. 1, Jan. 1993, A. Swindlehurst et al, Azimuth/Elevation Direction Finding Using Regular Array Geometries, pp. 145-156.
IEEE Transactions on Antennas and Propagation, vol. AP 30, No. 3, May 1982, B. Widrow et al, Signal Cancellation Phenomena in Adaptive Antennas: Causes and Cures, pp. 469-478.
IEEE Transactions on Acoustics, speech and Signal Processing, vol. 36, No. 3, Mar. 1988, SOO-ChangPei et al, Modified Spatial Smoothing for Coherent Jammer Suppression without Signal Cancellation, pp. 412-414.
IEEE Transactions on Acoustics, Speech and Signal Processing, vol. 37, No. 7, Jul. 1989, Richard Roy, ESPRIT--Estimation of Signal Parameters Via Rotational Invariance Techniques, pp. 984-995.
Asilomar Conference on Signals, Systems & Computers M. Pepin et al, On the Performance of Several 2D Harmonic Retrieval Techniques, pp. 1-5.
IEEE Proceedings, Sep. 1993, vol. 81, No. 9, A. Van Der Veen et al, Subspace-Based Signal Analysis Using Singular value Decomposition, pp. 1277-1307.
Mai Tan V.
Siemens Aktiengesellschaft
LandOfFree
Method for the high-resolution evaluation of signals for one or does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for the high-resolution evaluation of signals for one or , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for the high-resolution evaluation of signals for one or will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1377021