Michael F Mckenney

US Patent:

6466958, Oct 15, 2002

Filed:

Sep 12, 2000

Appl. No.:

09/659517

Inventors:

Robert J. Van Wechel - Yorba Linda CA
Michael F. McKenney - Anaheim CA

Assignee:

Interstate Electronics Corporation, a division of L3 Communications Corporation - Anaheim CA

International Classification:

G06F 1715

US Classification:

708422, 375142, 375143, 375150, 375152

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.

US Patent:

6567833, May 20, 2003

Filed:

Jul 26, 2002

Appl. No.:

10/207712

Inventors:

Robert J. Van Wechel - Yorba Linda CA
Michael F. McKenney - Anaheim CA

Assignee:

Interstate Electronics Corporation, a division of L3 Communications Corp. - Anaheim CA

International Classification:

G06F 752

US Classification:

708622, 708441

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.

US Patent:

6643678, Nov 4, 2003

Filed:

Jul 26, 2002

Appl. No.:

10/207425

Inventors:

Robert J. Van Wechel - Yorba Linda CA
Michael F. McKenney - Anaheim CA

Assignee:

Interstate Electronics Corporation, a division of L3 Communications Corporation - Anaheim CA

International Classification:

G06F 1100

US Classification:

708530, 375150

Abstract:

An apparatus and method allow receivers to quickly acquire a pseudorandom noise signal. 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. One receiver includes a Doppler offset generator that can advantageously offset a time index used to address a tap position in a non-coherent memory to compensate for code drift in a code with a frequency offset. The amount of offset is computed by accumulating clock cycles of a clock signal that is related to the frequency offset computed by the DFT or FFT frequency bin. The offset aligns a correlation peak in the received code such that the correlation peak can be accumulated in relatively fewer tap positions or addresses.

US Patent:

7092429, Aug 15, 2006

Filed:

Sep 26, 2002

Appl. No.:

10/256258

Inventors:

Michael F. McKenney - Anaheim CA, US

Assignee:

Interstate Electronics Corporation - Anaheim CA

International Classification:

H04B 1/69
H04B 1/707
H04B 1/713

US Classification:

375132, 375343, 375367, 708403, 708404, 708405, 708422

Abstract:

A multi-pass frequency hop timing acquisition correlator that produces a more accurate time estimate from the fast acquisition frequency hop signal is disclosed. The time estimate produced by the multi-pass acquisition correlator is more accurate than the hop estimate produced by single-pass fast acquisition correlators. The multi-pass frequency hop timing acquisition correlator uses a time estimate generated by a previous pass through the multi-pass frequency hop timing acquisition correlator as a starting point for computing a new, more accurate, time estimate. Thus, the second pass through the multi-pass frequency hop timing acquisition correlator produces a time estimate that is relatively more accurate than the time estimate produced by the first pass. The more accurate time estimate produced by the multi-pass acquisition correlator reduces the hardware and time needed by the direct acquisition process to acquire the M-code. In one embodiment, the multiple-pass frequency-hop correlator on the second or third pass provides microsecond-level timing from a GPS M-code fast acquisition frequency hop signal in a jamming environment.

US Patent:

7185038, Feb 27, 2007

Filed:

Aug 29, 2003

Appl. No.:

10/651895

Inventors:

Robert J. Van Wechel - Yorba Linda CA, US
Michael F. McKenney - Anaheim CA, US

Assignee:

Interstate Electronics Corporation - Anahiem CA

International Classification:

G06F 17/15
H04B 15/10

US Classification:

708422

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.

US Patent:

7870178, Jan 11, 2011

Filed:

Feb 27, 2007

Appl. No.:

11/679755

Inventors:

Robert J. Van Wechel - Yorba Linda CA, US
Michael F. McKenney - Anaheim CA, US

Assignee:

Interstate Electronics Corporation - Anaheim CA

International Classification:

G06F 17/15
H04B 1/00

US Classification:

708422, 375150

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.