Abstract: A method for receiving direct-sequence spread spectrum signals containing a plurality of codes with digital beamforming in a receive array apparatus composed of a plurality of spaced antenna elements coupled to at least one receiver with at least one low noise amplifier, at least one frequency down-converter and at least one analog-to-digital converter and at least one digital signal processing computer or device for said plurality of spaced antenna elements, the method comprising the steps of: receiving said direct-sequence spread spectrum signals in said receive array apparatus, the signals emanating from a plurality of positions or from one or multiple transmitters; multiplying said received signals at each element by a reflecting code to produce reflected signals hereinafter referred to as Element Reflected Signals; combining said Element Reflected Signals forming a common signal for the array; converting said common signal to a convenient intermediary frequency signal; sampling said intermediary frequenc

Abstract: A method for navigating a moving object (vehicle) utilizing a Navigation manager module and comprising the steps of: communicating with all sensors, processing units, mission manager and other vehicles navigation managers; configuring and reconfiguring sensors based on mission scenario objectives, in-vehicle and global constraints; sensor grouping according to relationship to the vehicle and environment, where an entire sensor group is seen by navigation manager as a single sensor; processing unit containing Update Filter; and a dynamically updated API database.

Abstract: A method and apparatus for determining the synchronization and the position of terminals comprising of methods and apparatus for receiving a plurality of signals from opportunistic transmitters such as analog or digital radio/television broadcast and cellular tower signals; down-converting, sampling and processing such signals without requiring demodulation or detection of specific channel or timing features; re-transmitting the signals to another terminal or processing center; correlating the received and re-transmitted signals while generating estimates for differential ranging relative to each opportunistic transmitter and differential frequency and time synchronization offset for each pair of terminals; determining the position or coordinates of the at least two terminals using corresponding differential range measurements while using differential ranging measurements from three or more of such opportunistic transmitters.

Abstract: A method for transmitting digital beamformed signals in a transmit array antenna apparatus utilizing a single transceiver with one power amplifier, one up-frequency converter and one digital-to-analog converter for said array transmit antenna apparatus comprising the steps of: generating a first set of direct-sequence spread spectrum codes; generating a plurality of weights, each weight being a beamforming amplitude and phase or delay for each element; generating a direct-sequence spread spectrum multiplexed signal containing such weights while using one of such first-set codes per element; converting such an multiplexed signal to a convenient radio frequency; amplifying and transmitting such a multiplexed radio frequency signal to the elements; generating a second set of direct-sequence spread spectrum codes; extracting a radio frequency signal with direction-bearing weight information at each element while using a subset of codes from the second set; generating a third set of direct-sequence spread spectrum

Abstract: A data communications system, particularly suited for shared or wireless communications channels, capable of accommodating terminals having different throughput capabilites by flexibly allocating cyclically rotated phases of a common code is disclosed. One or more shifts of a cyclic orthogonal code are assigned to a terminal. These codes are preferably cyclically padded to increase their tolerance to arbitrary time shifts, and the resulting codes are used to spread the signals for transmission.

Abstract: A system (101-139) receives a transmitted optical signal and generates an orthogonal despreading code that is different than the code used to spread the transmitted signal. The system (101-139) then despreads the received signal using the despreading code. By using a code to despread the received signal that is different than the code used to spread the signal, the overall interference in the system can be reduced and even eliminated.

Abstract: A method includes receiving a transmitted signal and generating an orthogonal despreading code that is different than the code used to spread the transmitted signal. The method then despreads the received signal using the orthogonal despreading code. By using a code to despread the received signal that is different than the code used to spread the signal, the overall interference in the system (100) can be reduced.

Abstract: The data communications systems disclosed herein accommodates terminals having different throughput capabilities by flexibly allocating cyclicly rotated phases of a common pseudo-noise (P/N) code. Throughput capabilities of the terminals are expressible in multiples of a preselected minimum throughput rate so that a single respective code phase is assigned to any terminal operating at the minimum throughput rate while a plurality of sequential consecutive phases are assigned to each terminal having a capability greater than the minimum throughput rate. One or more unassigned phases are provided between phases assigned to different terminals. Any terminal operating at the minimum throughput rate utilizes all time slot intervals in a predetermined frame interval while terminals of greater capability are assigned time slots in accordance with the amount of data traffic to be carried by that terminal and the number of code phases assigned thereto.