Abstract: In a jamming cancellation system wherein a balanced modulator receives as two inputs thereto: the desired plus jamming signals, and the AM difference frequency produced by the beating of the desired and jamming signals, jamming suppression, in an environment containing two jamming signals, is achieved by peak detecting the output from the AM difference frequency producing means and applying same directly to the receiver video input or upconverting same to the receiver r.f. frequency and applying same to the system receiver.

Abstract: A method and system for determining a position of an orbiting transceiver in a communications network includes at least a first and second transceiver at a first and second known location, respectively, on Earth. The first and second transceivers are adapted to transmit and receive communications signals to and from the orbiting transceiver. A processor coupled to one of the first and second transceivers determines a first and second range measurement between each of the first and second transceivers and the orbiting transceiver, respectively, as well as corresponding first and second range rates representative of a time rate of change of the first and second range measurements.

Abstract: A direction-finding method for determining an incident angle of a high-frequency electromagnetic signal in a system including at least two receiving antennas spaced apart by a known distance. the antenna output signals of the at least two receiving antennas are converted, together (in accordance with a multiplexing procedure) or individually, into the frequency domain through a Fourier transformation, followed by a conversion into an IF range and an A/D conversion. In this range, the phase difference between the output signals is determined and the signal frequency of the incident wave is determined through a phase-sequence analysis. The incident angle of the incident wave is determined from the phase difference and the signal frequency.

Abstract: A method and apparatus is disclosed for measurement processing of Satellite Positioning System (SPS) signals. A plurality of SPS signals from a corresponding plurality of SPS satellites are received in an SPS receiver. The signal environment corresponding to the location in which the SPS receiver is located is characterized to produce signal environment data. In one exemplary embodiment, an information source, such as a cellular network based database, is searched to retrieve the signal environment data given an approximate location of the GPS receiver. This approximate location may be specified by a location of a cell site which is in cellular radio communication with a cellular communication device which is co-located with the GPS receiver. One or more parameters related to signal characteristics of the satellite signals are defined. Threshold values for the parameters are determined using the signal environment data.

Abstract: A method and apparatus for coupling data from an external data device to a position determination device. An Auxiliary Data Transmission Unit (ADTU) that includes a radio transmitter couples to the external data device. The ADTU receives serial data from the external data device and encodes the received serial data into a format suitable for receipt by the position determination device. The encoded data is then modulated to produce a radio signal that is transmitted to the position determination device in a scheme that permits multiple devices to communicate with the position determination device without interference.

Abstract: A system and method for statistically modeling the operation of a directional terminal antenna in a wireless link. When using a directional terminal antenna, received power may be enhanced by as much as the antenna gain. In local scattering, however, the enhancement will be smaller. The system and method model this decrement, known as the gain reduction factor, &Dgr;, for fixed suburban paths, based on angle-of-arrival measurements. The system and method also provide the capability to statistically model the transmission performance of a directional terminal antenna in a wireless link while analyzing influences of antenna height, antenna beamwidth, distance and season.

Abstract: A global position satellite receiver (GPS receiver) is located in a fixed, undefined location on or in the vacinity of a golf course. The distance and direction between the fixed GPS receiver and a pin on the green of a hole on the golf course is measured using conventional distance and direction measuring apparatus. This is a first measured leg. A mobile GPS receiver, with computer, is on the golf course. A golf ball is on the fairway of the hole. The fixed GPS receiver receivers first global position satellite signals (GPS Data) from global position satellites in orbit above the earth, the first GPS Data defining a location for the fixed GPS receiver. The mobile GPS receiver receives second GPS Data from the global position satellites which defines a location for the mobile GPS receiver. Both sets of GPS Data are identically contaminated and both location definitions are unreliable, in accuracy.

Abstract: Multiple pulses of narrow band signals of varying frequency are detected by multiple spaced apart receivers such that average time difference of arrivals of the signals from an item to be located are determined. The average time differences are used to calculate a position of the item to be located with a desired accuracy, such as within one meter in one embodiment. One of multiple receivers or rangers initiates a location process by transmitting a sync pulse. The sync pulse is received by a scout and other rangers. The scout is a small robot which acts as a transponder, sending out its own narrow band return pulse in response to the sync pulse. Each ranger then determines a difference in time between the sync pulse it receives and the return pulse generated by the scout. The location process is then repeated again at different selected narrow band frequencies, and an average of the difference in time at each ranger is determined.

Abstract: A bistatic passive radar system having a display; a first directional antenna for determining the angle between the reference azimuth of the bistatic passive radar system and the line of sight to a host transmitter; an omnidirectional antenna for receiving reflected radar pulses from targets at any bearing; and a second directional antenna for determining the angle B between the line of sight to the host transmitter and a second line which extends from the bistatic passive radar system to a selected target. The angle of the second directional antenna is indicated by a B cursor on the display. The system includes a bistatic range correction circuit that utilizes an empirical determination of the distance D between the bistatic passive radar system and the host transmitter for determining the correct range for display of a selected target.

Abstract: In a rescue target position indicating apparatus of the invention, when a pipper image, which is visible through a combiner of a head mounting type display device attached to a wearer in a flight vehicle, corresponds to a rescue target, the wearer operates an input device, so that an information processing device computes a rescue target position based on a detected result of variables of a detecting device necessary for computing the rescue target position. From a plurality of positions of the flight vehicle, which were updated in the past, an anticipated update position in a next updating time, a plurality of interpolating positions between a position updated in the past closest to the present and the anticipated update position, and an elapsed time to the present from the updated time of the position, which was updated in the past closest to the present, an interpolating position corresponding to the elapsed time is computed.

Abstract: An intersection information supply system supplies information about a first vehicle approaching an intersection on a first road to a driver of a second vehicle approaching the intersection on a second road, the first road and the second road intersecting at the intersection, wherein the intersection information supply system includes: a transmission unit, provided in the first vehicle, transmitting a predetermined signal when the first vehicle approaches the intersection; a receiving unit, installed near the intersection, receiving the predetermined signal from the transmission unit provided in the first vehicle; and an information supply unit supplying information to the second vehicle approaching the intersection on the second road when the receiving unit receives the predetermined signal, the information indicating that there is the first vehicle approaching the intersection on the first road.

Abstract: An array antenna includes a dielectric substrate layer having opposing sides. A ground plane conductor is positioned on one side of the dielectric substrate layer. A plurality of antenna elements, such as slots, are formed within the ground plane conductor. The antenna elements are arranged to form an array. A plurality of signal tracks, such as striplines, extend along the side of the dielectric substrate layer opposing the ground plane conductor. The respective striplines extend under each antenna element. A plug-in card slot is operatively connected to the plurality of striplines and adapted for receiving a plug-in card and connecting to a plurality of striplines within the plug-in card to have a desired phase shift to scan the beam to a desired location.

Abstract: A portable type distance/speed meter is designed for measuring a travel distance and a travel speed in response to GPS electromagnetic waves received by a GPS receiver.

Abstract: An apparatus and method for mapping surfaces of an object, such as a structure or vehicle, that utilizes transceivers mounted on portable support structures to orient a probe to form a local global positioning satellite (GPS) system. The probe is placed on reference points of the object and information related to the reference point is input into a data processor. The processor uses the reference points are used to identify and orient the object, and a model of the object is retrieved from memory. Additional position data of the object is gathered and processed to generate a graphical image of the object being mapped. The model is compared to the mapped image of the object and structural damage is assessed. Information relating to repair procedures is output to a workstation and the area under repair can be mapped to evaluate the success of the repair procedure.

Abstract: Novel transmit-only geo-location techniques which can operate synergistically with existing or newly designed satellite or ground-based wireless communications networks using micro-miniature emergency geo-location beacons to provide personal security are described. A combination of physical measurement parameters (Doppler shifts and/or time intervals obtained from clock or signal correlation data) allows geo-location with a reduced number of satellite or wireless receive nodes, thus reducing the cost or increasing the coverage of the system as compared to current geo-location systems. In addition, several of these techniques allow geo-location to be performed on optical and infra-red radiation sources, which can enable tracking of any emitter by existing or newly designed surveillance satellites, including commercial and military aircraft, and hostile missiles or other optically active targets.

Abstract: A navigation system for a mobile vehicle includes a vehicle position data generator for generating signals indicating location of the mobile vehicle, and scene information provider which generates information representative of the layouts of local environs at various locations and a display. A real environment scene generator, using position data acquired from the vehicle position data generator, acquires information from the local scene information provider representative of the local scene at the vehicle position indicated by the position data. The real environment scene generator generates location pertinent information which is used by the display to display a scene depicting the locality setting in a three dimensional format. The real environment scene generator also generates direction information which is used to display directions overlaid on the displayed local scene.

Abstract: A method and system for finding the position of a mobile unit with respect to the satellites of a satellite network such as the Global Positioning System and with respect to the base stations of a wireless communications network. Each satellite transmits a signal that consists of a series of frames of a pseudonoise sequence. The frames of a signal received from the satellite network by the mobile unit are arranged as columns of a matrix and are processed coherently to provide estimated pseudoranges and estimated rates of change of pseudoranges for in view satellites. The coherent processing includes performing an orthogonal transform on the rows of the matrix, multiplying the elements of the matrix by Doppler compensation factors, and then, for each satellite in view, convolving the columns of the matrix with the pseudonoise sequence of that satellite. Other pseudoranges are inferred from synchronization burst sequences received by the mobile unit from one or more base stations.

Abstract: A method for checking the reliability of nominal position findings on the basis of propagation time measurements. The method is characterized by the use of inertial systems to increase the measurement redundancy of the available measured values. The dimension of the measurement matrix of the nominal system is advantageously increased for such purpose. The method is primarily suitable for hybrid inertial/satellite navigation systems.

Abstract: A communications system in which a communications channel is defined at least in part by an electromagnetic wave having a carrier frequency and an electric field vector, the extremity or terminus of which traces a non-linear periodic path at a rotation frequency less than the carrier frequency and greater than zero from the perspective of an observer looking into the axis of propagation of the wave. The transmitter of the communications system launches a wave having such characteristics and modulated with information in a suitable manner. The receiver of the communications system is sensitive to the periodic path and rotation frequency. The combination of the periodic path and the carrier frequency provides selectivity that can be used to define multiple communications channels.

Abstract: A system for differential navigation of an autonomous vehicle in the location with the limited visibility of the sky is disclosed. The system employs a plurality of satellites, a plurality of ground transmitters, and a base station. Different configurations for the minimum number of the satellites and the minimum number of ground transmitters are disclosed.