USA As Represented by Secretary of the Navy

Alan Fronk

William H Marn

J Mark Stevenson

Susan G Briest

Gregory Knowles Fleizach

Jack R Olson

Heidi L Buck

Barry R Hunt

Matthew Joseph Nicholson

Matthew Fong

Brian T Williams

Peter C Grossnickle

Christopher Lawson Fletcher

Vincent K McDonald

A system and process for the geo-location of an asset given no a priori knowledge regarding time and location of the asset with minimized power consumption is disclosed. In the preferred embodiment, the system is accurate to about 30 meters CEP (50% circular error probable) using just a short segment, e.g., 100-200 ms, of digitized GPS L1 signal data.

System and method for geo-locating a receiver with reduced power consumption

The invention provides an automatic gain control system that is implemented by digital hardware. The digital hardware determines the range of a set of digital data values, and then examines each digital data value in a sequence. An index counter increments a sample count index i each time a new digital data value is examined and determines the absolute value of the i digital data value. The digital hardware also counts both the number j of digital data values that exceed a high percentage value of the range, and the number k of digital data values that are less than a low percentage value of the range as the digital hardware runs through the sequence. If the digital hardware determines that a digital data value is greater than the high percentage value, the ratio j/i exceeds a first threshold value, and the gain level is not set to the lowest gain level, then the gain is decreased. If the digital hardware determines that a digital data value is less than the low percentage value, the ratio k/i exceeds a second threshold value, a predetermined interval of time has elapsed, and the gain level is not set to the highest gain level, then the gain is increased.

Automatic gain control

A communications node includes a controller for 1) initializing a counter and resetting a FIFO buffer; 2) determining if a predetermined number of data packets have been transmitted; 3) transmitting the data packets after the FIFO buffer is partially filled if the number of data packets transmitted is less than the predetermined number, incrementing the counter, and returning to step (2); 4) directing a transceiver to be in a receive mode if the predetermined number of data packets have been transmitted; 5) determining if a command signal has been detected; 6) processing a backlink command if a command signal has been detected, and then directing the transceiver to be in transmit mode, clearing the counter, and returning to step(2); and 7) setting the receiver in a transmit mode if no command signal has been detected, and then clearing the counter and returning to step (2).

Digital data communications system

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Oceanside, CA, United States of America

Alan Fronk