Texas Instruments Corporation

Raytheon Ti Systems, Inc.

Hugh L Scott

John P Volpi

Leonard J LaPadula, Iii

Chyi H Lu

David W Rekieta

Mitchel B Stiles

Jerry D Holmes

George W Pawlowski

A method and system for synchronization of pulse groups without a synchronization signal which comprises selecting a plurality of equal time length coherent processing intervals from a stream of data in the time domain, generally analog data. The data in each of the coherent processing intervals is sampled during each of N equal pulse repetition intervals to provide samples of data, each sampling taking place for an equal portion of the pulse repetition interval. Each of the samples of data is identified according to the position thereof in the associated coherent processing interval. The time domain data is converted to frequency domain data on the basis of the position of the time domain data in the coherent processing interval, all of the samples with the same position in a different coherent processing interval being separately collectively converted. The frequency domain data is then compensated for phase rotation by determining the length of the coherent processing interval, the length of the pulse repetition interval and the duration of the sampling and altering the phase of the frequency domain data in response thereto. An FFT is provided of selected ones of the frequency domain data. The results of the FFT of the selected ones of the frequency domain data are then displayed.

Coherent synchronization and processing of pulse groups

There is disclosed a multi channel GPS digital signal processor on a single IC. Each channel contains circuitry to process L1 or L2 P(Y) and C/A-code signals. In addition a search processor is included to achieve fast signal acquisition. Low power adder/accumulators have been designed to provide for a high precision digital oscillator whose output is synchronous to a high speed clock. The IC contains a full low power null detector and eight correlators to aid in signal acquisition.

Method and system for a multi channel and search global position system

There is disclosed a global positioning system receiver method and system which converts the analog signals to digital signals prior to performing signal acquisition and GPS unique processing functions. The A/D converter uses full null zone processing to increase anti-jamming capability and 4-level output to reduce signal processing. A single analog and digital channel is used for both the L1 and L2 channels as well as for all P(Y)-code and C/A-code thus allowing full multi channel tracking with several channels each tracking a separate signal while the remainder of the channels rove over all of the signals on the alternate L-band with programmable duty cycles. The system allows for Y-code substitution for P-code by multiplexing a portion of the Y-code generated between multiple channels.

System and method for a digital navigation satellite receiver

An enhanced P-code channel (60) for use in a GPS receiver (10) to simultaneously track L1 and L2 comprises a P-code clock generator (62) for generating two code clocks. The first code clock associates with L1 and the second associates with L2. The code clocks have the same frequency but different phases from one another. Circuitry (64) and (66) generate and store a plurality of P-code chips. A first circuit (68, 70) selects and updates P-code chips from the stored P-code chips that are in phase with the L1 code clock. A second circuit (72 and 74) selects and updates P-code chips from the P-code chips and phased with the L2 code clock.

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Colorado Springs, CO, United States of America

Hugh L Scott