Jerry D Holmes

US Patent:

48072567, Feb 21, 1989

Filed:

Dec 23, 1985

Appl. No.:

6/811984

Inventors:

Jerry D. Holmes - Dallas TX
Hatcher E. Chalkley - Carrollton TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04L 2706

US Classification:

375 97

Abstract:

A Global Position System (GPS) receiver is disclosed which includes an RF converter and quadrature digitizer implemented in hardware and a signal processor including a computer, code generator and preprocessor. The preprocessor has a divide by 1,2,3 divider for controlling the code generator so as to provide I,Q early, prompt and late digital signals of 0. 5 chip separations to the computer for tracking code phase, carrier phase/frequency and signal amplitude. This structure eliminates the need for numerically controlled oscillators implemented in hardware while maintaining accurate performance.

US Patent:

51856107, Feb 9, 1993

Filed:

Aug 20, 1990

Appl. No.:

7/569890

Inventors:

Phillip W. Ward - Dallas TX
H. Logan Scott - The Colony TX
Jerry D. Holmes - Colorado Springs CO
Leonard J. LaPadula - Carrollton TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04B 7185
G01S 502

US Classification:

342357

Abstract:

A GPS single-receiver pointing/attitude system derives pointing/attitude measurements by correlating a selected GPS code (either P or C/A), recovered from GPS navigation signals using a single GPS receiver with multiple GPS antennas (a reference antenna and at least two slave antennas for pointing or three for attitude). For a two antenna pointing application, the GPS receiver (FIG. 4) includes, for each receiver channel, the incoming GPS signals are applied to three code correlators (72-75) assigned to the reference antenna, and three code correlators (76-77) assigned to the slave antenna, which provide corresponding reference and slave I and Q correlation outputs. The single-receiver pointing technique involves: (a) using the reference I and Q correlation outputs to establish a conventional reference antenna tracking loop; and (b) processing the reference and slave I and Q correlation outputs (using differential carrier doppler phase or code phase measurements) to determine phase differences from which pointing can be computed.

US Patent:

39367517, Feb 3, 1976

Filed:

Sep 5, 1974

Appl. No.:

5/503943

Inventors:

Jerry D. Holmes - Dallas TX
Benjamin L. Lowe - Huntsville AL
Samuel D. Moore - Plano TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04B 116

US Classification:

325347

Abstract:

An SWD structure is employed in an FM receiver for signal demodulation and band limiting. An FM signal is applied to the input of an SWD patterned for bandwidth limitation. Two SWD output channels characterized by predetermined differential delays of the modulated input signal are amplitude limited and mixed to produce an audio modulation component.

US Patent:

41123727, Sep 5, 1978

Filed:

Jan 11, 1977

Appl. No.:

5/758520

Inventors:

Jerry D. Holmes - Dallas TX
Charles R. Johnson - Garland TX
Allen S. Jones - Dallas TX
Charles R. Hewes - Richardson TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H04L 100

US Classification:

325321

Abstract:

An improved spread spectrum communication system having a transmitter subsystem and a receiver subsystem is disclosed. The transmitter subsystem comprises a data source of 50 bps rate which is modulo-2 added to a C/A (clear/acquisition) code of 1,023K chips/sec in an EXCLUSIVE OR gate, phase modulated on a carrier signal at about 154 f. sub. o where f. sub. o = 10. 23 MHz in a phase shift keying modulator and transmitted. The receiver subsystem comprises an antenna for receiving the phase modulated signal, a plurality of filter/amplifier mixer stages for reducing the phase modulated signal to baseband, an in-phase CCD matched filter channel and a quadrature phase CCD matched filter channel for determining the presence of the C/A code and the phase of the incoming C/A code for synchronizing a replica of the C/A code with the incoming C/A code, a mixer for beating the replica C/A code signal with the C/A code signal, a Costas loop for automatic phase control, a sampler for sampling the baseband signal, an integrator for integrating the sampled signals, and a clocked comparator for comparing the integrated signals with a zero voltage at a 50Hz rate to demodulate the data code. Two embodiments of the CCD matched filter are disclosed. The first comprises a CCD having a length equal to five times the number of stages for each period of the C/A code.

US Patent:

44687931, Aug 28, 1984

Filed:

Dec 1, 1980

Appl. No.:

6/211499

Inventors:

Charles R. Johnson - Garland TX
Phillip W. Ward - Dallas TX
Joe H. Lindley - Garland TX
Robert A. Maher - Richardson TX
Jerry D. Holmes - Dallas TX
Troy D. Fuchser - Plano TX

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G01S 502

US Classification:

375 97

Abstract:

A global positioning system comprises an RF receiver for receiving L. sub. 1, L. sub. 2 p-code or ca code modulated frequency outputs from one or more space vehicles, a multiplexer operably connected to the receiver multiplexes the L. sub. 1 and L. sub. 2 signals to the receiver, and code and carrier tracking loops operably connected to the receiver, each loop including a plurality of filters, one for tracking line-of-sight dynamics and another for determining ionosphere effects on the L. sub. 1 and/or L. sub. 2 signals.