Systems and methods for extracting coherent correlation data

Details Systems and methods for extracting coherent correlation data Systems and methods for extracting coherent correlation data

2011-01-11

2011-01-11

Ngo, Chuong D (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

C375S150000

Reexamination Certificate

active

07870178

ABSTRACT:
An apparatus and method allow receivers to quickly acquire a pseudorandom noise signal. A receiver advantageously detects frequency shifts using a compact parallel process hardware implementation of a Discrete Fourier Transform (DFT). The simultaneous detection of multiple frequencies allows the receiver to search the frequency range of the transmitted signal in larger increments of frequency, thereby increasing the speed of acquisition. One receiver does not use coherent integration before computation of the transform and advantageously maintains a flat frequency response. The flat frequency response of the DFT circuit enables searching of multiple frequency offsets without CPU intensive processing to compensate for frequency response variations. A receiver can include a Doppler correction circuit, which permits correlation data with frequency shift in the code to be non-coherently integrated among relatively fewer addresses or tap positions in memory.

REFERENCES:
patent: 4104631 (1978-08-01), Weigle et al.
patent: 4231102 (1980-10-01), Barr et al.
patent: 4284651 (1981-08-01), Bruemmer
patent: 4524681 (1985-06-01), Harris et al.
patent: 4569850 (1986-02-01), Hedgepeth et al.
patent: 4747067 (1988-05-01), Jagodnik
patent: 4896287 (1990-01-01), O'Donnell et al.
patent: 4945505 (1990-07-01), Wiener et al.
patent: 4972361 (1990-11-01), Rader
patent: 5000967 (1991-03-01), Adams et al.
patent: 5093801 (1992-03-01), White et al.
patent: 5170415 (1992-12-01), Yoshida et al.
patent: 5170698 (1992-12-01), Kirk
patent: 5196222 (1993-03-01), Kirk
patent: 5200217 (1993-04-01), Elliott et al.
patent: 5231921 (1993-08-01), Kirk
patent: 5237587 (1993-08-01), Schoolcraft
patent: 5303260 (1994-04-01), Fonnesbeck et al.
patent: 5411755 (1995-05-01), Downton et al.
patent: 5414728 (1995-05-01), Zehavi
patent: 5414729 (1995-05-01), Fenton
patent: 5433965 (1995-07-01), Fischer et al.
patent: 5560951 (1996-10-01), Pao et al.
patent: 5574754 (1996-11-01), Kurihara et al.
patent: 5646626 (1997-07-01), Willis
patent: 5759611 (1998-06-01), Langfitt, Jr.
patent: 5784306 (1998-07-01), Ogletree
patent: 5787801 (1998-08-01), Kirk et al.
patent: 5817360 (1998-10-01), Pao et al.
patent: 5897605 (1999-04-01), Kohli et al.
patent: 5901171 (1999-05-01), Kohli et al.
patent: 5968112 (1999-10-01), Kirschenbaum et al.
patent: 5974080 (1999-10-01), Papasakellariou
patent: 5989615 (1999-11-01), Bernard
patent: 5996482 (1999-12-01), Kirk et al.
patent: 6005887 (1999-12-01), Bottomley et al.
patent: 6005889 (1999-12-01), Chung
patent: 6028883 (2000-02-01), Tiemann et al.
patent: 6083540 (2000-07-01), Christensen et al.
patent: 6111911 (2000-08-01), Sanderford, Jr. et al.
patent: 6278403 (2001-08-01), Peng et al.
patent: 6298083 (2001-10-01), Westcott et al.
patent: 6335947 (2002-01-01), Lattard et al.
patent: 6349317 (2002-02-01), Kantabutra
patent: 6363108 (2002-03-01), Agrawal et al.
patent: 6371014 (2002-04-01), Ismail et al.
patent: 6385633 (2002-05-01), Schmidl
patent: 6466958 (2002-10-01), Van Wechel et al.
patent: 6567833 (2003-05-01), Van Wechel et al.
patent: 6643678 (2003-11-01), Van Wechel et al.
patent: 6718868 (2004-04-01), Ismail et al.
patent: 7185038 (2007-02-01), Van Wechel et al.
patent: 2003/0059509 (2003-03-01), Grewal
patent: 2003/0186417 (2003-10-01), Brunstedt et al.
patent: 2004/0043126 (2004-03-01), Grewal
PCT International Search Report PCT/US01/28997.
D. Leimer, “Sequential Detection Test for GPS C/A Acquisition,” Magnavox MRL Reference No. MX-TM-3166-75 (Feb. 4, 1975).
Abraham Waid, “Sequential Analysis,” John Wiley & Sons, Inc., (1947).
Sequential Analysis of Statistical Data: Applications, Authorship and Data unknown at this time.
Ray Andraka, “A survey of CORDIC Algorithms for FPGA Based Computers,” Proceedings of the 1998 ACM/SIGDA Sixth International Symposium on Fiend Programmable Gate Arrays, pp. 191-200, Feb. 22-24, 1998.
Bob Van Wechel, “Enhanced GPS for Combat Systems,” Final Report WL-TR-95/1146, pp. 1-119 (Interstate Electronics Corporation 1995).
Ed. F. Deprettere, et al., “Pipelined CORDIC Architectures for Fast VLSI Filtering and Array Processing,” Proc. IEEE ICASSP 1984, pp. 41A.6.1-41A.6.4.
Alvin M. Despain, “Fourier Transform Computers Using CORDIC Iterations,” c23 IEEE Transactions on Computers 993-1001 (Oct. 1974).

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