82 results about "Satellite transmitter" patented technology

Disclosed herein is a system for rapidly resolving position with centimeter-level accuracy for a mobile or stationary receiver [4]. This is achieved by estimating a set of parameters that are related to the integer cycle ambiguities which arise in tracking the carrier phase of satellite downlinks [5,6]. In the preferred embodiment, the technique involves a navigation receiver [4] simultaneously tracking transmissions [6] from Low Earth Orbit Satellites (LEOS) [2] together with transmissions [5] from GPS navigation satellites [1]. The rapid change in the line-of-sight vectors from the receiver [4] to the LEO signal sources [2], due to the orbital motion of the LEOS, enables the resolution with integrity of the integer cycle ambiguities of the GPS signals [5] as well as parameters related to the integer cycle ambiguity on the LEOS signals [6]. These parameters, once identified, enable real-time centimeter-level positioning of the receiver [4]. In order to achieve high-precision position estimates without the use of specialized electronics such as atomic clocks, the technique accounts for instabilities in the crystal oscillators driving the satellite transmitters, as well as those in the reference [3] and user [4] receivers. In addition, the algorithm accommodates as well as to LEOS that receive signals from ground-based transmitters, then re-transmit frequency-converted signals to the ground.

An asset tracking system includes a tracking device for mounting on an asset. The tracking device has a GPS receiving device for receiving GPS signals from GPS satellite transmitters. A tracking device communication device and a microcontroller are connected with both the GPS receiving device and the tracking device communication device for controlling the tracking device. Further, a tracking device management system is provided comprising a tracking system server, a management system communication device and a management system communication interface for interfacing with the management system communication device and the tracking system server. A tracking device communication link between the tracking device communication device and the management system communication device enables the tracking device management system to communicate with the tracking device. A customer communication link between a customer and the management system communication interface enables the customer to communicate with the tracking device management system.

The present invention provides a vehicle information display and communication system having a plurality of operative modules, the system includes a control processing unit adapted to provide an interface among the plurality of operative modules. The operative modules include a display module adapted to provide visual information to the occupants of the vehicle, a navigation module adapted for global positioning satellite reception to provide vehicle position information to the control processing unit, and a telecommunications module adapted for wireless communication to provide communication between the control processing unit and a wireless telecommunications network and between the control processing unit and any one of a plurality of local wireless devices. The system further includes a local network interface module adapted to provide communication between a vehicle control bus and the control processing unit, and an antenna array including a GPS antenna mounted in an overhead console, the overhead console adapted to extend forward over the upper edge of the vehicle windshield such that GPS antenna maintains line-of-sight with at least one global positioning satellite transmitter at all times.

A device, method, and computer program product for monitoring and transmitting a location and a local status of a remote device using a simplex satellite transmitter. The monitoring device includes a position location unit, a simplex satellite transmitter, a power source, and a controller. The position location unit is configured to determine a location of the remote device. The simplex satellite transmitter is configured to transmit the location to one or more satellites in low earth orbit. The controller includes a power management unit configured to control a power state of the position location unit and the simplex satellite transmitter, and to periodically enable and disable power from the power source to the position location unit and the simplex satellite transmitter.

A method and system for providing travel guidance for transportation vehicles traveling on a highway system that comprises highway transceivers (HTs) with limited range placed at selected intervals along the highway. Each transportation vehicle has an automobile transceiver (AT) for receiving and transmitting information using a communication protocol. The HTs have a limited transmission range. The AT may be programmed to selectively present information received from the HTs to a passenger in an automobile. The ATs may also receive information from other transportation vehicles equipped with an AT. The HTs may receive information from all of the transceivers or other transmitters, for example, a GPS satellite transmitter. The HTs may also transmit information to traffic signal units about numbers of vehicles in its transmission pattern.

A system for monitoring railroad cars comprising a hatch cover assembly including a cover body, a sensor, a wireless transmitter for transmitting data received from the sensor, a wireless receiver for receiving the data from the wireless transmitter, and a satellite transmitter for transmitting the data to a satellite. The wireless receiver and the satellite transmitter are attached to the hatch cover assembly. In one embodiment, the sensor is a pressure sensor having a sensing unit situated in the plenum of a vented hatch cover. In another embodiment, the sensor is an air flow sensor having a sensing unit situated in the plenum of a vented hatch cover. In another embodiment, the sensor is a chain tension sensor attached to a handbrake chain. In another embodiment, the sensor is a hatch cover position attached to the hatch cover assembly.

Provided is a system for collecting and managing rainfall attenuation data and rainfall intensity data in a satellite communication system. The system may include: a satellite transmitter to transmit a satellite beacon signal; a Global Positioning System (GPS) to transmit a GPS signal; at least one data collecting apparatus to generate rainfall attenuation data about the satellite beacon signal when the satellite beacon signal is received from the satellite transmitter, and to generate rainfall intensity data within a valid path length of rainfall attenuation, to extract time information from the GPS signal, and to assign the time information to the rainfall attenuation data and the rainfall intensity data; and a data managing apparatus to receive, from the at least one data collecting apparatus, the rainfall attenuation data and the rainfall intensity data assigned with the time information, and to manage the received rainfall attenuation data and rainfall intensity data.

A smoke multi-gas detector alarm and transmitter device includes a fire-proof blackbox mountable to a ceiling in a room. A carbon monoxide sensor is disposed in the fire-proof blackbox to detect an airborne carbon monoxide substance within the room. A smoke sensor is disposed in the fire-proof blackbox to detect an airborne smoke substance within the room. A combustible gas sensor is disposed in the fire-proof blackbox to detect an airborne combustible gas substance within the room. An audible alarm module is disposed in the fire-proof blackbox to be activated by one of the sensors. A processor/memory unit is disposed in the fire-proof blackbox to be activated by one of the sensors. A transmitter is disposed in the fire-proof blackbox to be activated by the processor/memory unit to send an alert signal (SMS or voice message) to a person at a remote computer and to a person at a cell phone. GPRS/SMS, WIFI, Satellite Transmitter can be used.

A method for analyzing the working performance of a damaged satellite-earth data transmission antenna comprises the steps of (1) calculating the equivalent isotropic radiated power (EIRP) of a satellite according to the output power of a satellite transmitter, satellite antenna gain and the transmission channel loss value; (2) calculating the maximum slant range R of signal transmission according to the mean terrain level of a satellite and the minimum elevation of a ground receiving antenna; (3) calculating the free space loss Lf of a signal according to the downlink carrier frequency of the satellite data transmission signal and R; (4) calculating all transmission losses L of the data transmission signal according to the atmosphere loss, the directivity loss of the receiving antenna, the polarization loss and atmosphere value of the receiving antenna and Lf; (5) calculating the bit signal to noise ratio of a received signal by means of the coding gain, the transmission code rate, the coding rate and the link margin; (6) calculating the bit signal to noise ratio actually needed by the received signal according to bit error rate requirements so as to obtain the channel margin, wherein if the margin is positive, the overall performance of the damaged data transmission antenna can still meet the requirements of a system, and the working performance of the data transmission antenna is affected otherwise.

A pseudo-satellite transmitter includes a GPS unit, a transmission power control unit, and a plurality of antennas. The GPS unit generates a GPS signal of a pseudo-satellite. The transmission power control unit generates a plurality of GPS signals having different power levels based on the GPS signal generated by the GPS unit and a distance from a shadow area to the pseudo-satellite transmitter. Each antenna is configured to wirelessly transmit the GPS signals with different power levels output from the transmission power control unit to a corresponding one of a plurality of shadow areas according to the distance from the shadow area to the corresponding antenna.

A communications system including a SN Device including a satellite transmitter and a local wireless transceiver and a GUI Device, separate from the SN Device. The GUI Device includes a user interface and local wireless transceiver capable of establishing a wireless link with the SN Device. The GUI Device transmits command information to the SN Device and the SN Device transmits at least location data to a satellite network.

The invention discloses an automatic power control device for an uplink of a satellite earth station and a control method thereof, belonging to the technical field of wireless network communication. The antenna of the invention is connected with an uplink power amplifying frequency conversion unit and a downlink frequency conversion low-noise unit by a feed source; the downlink frequency conversion low-noise unit is connected with a satellite beaconing receiver by a coaxial cable; the satellite beaconing receiver is connected with a signal attenuation controller by a control cable; the signal attenuation controller is connected with a satellite transmitter and the uplink power amplifying frequency conversion unit by the coaxial cables. The invention solves the interference of environment factors on a satellite signal link and achieves the goals of automatically controlling the power and resisting interference by increasing and decreasing the amplified intensity of the signals of a power amplifying control unit.

A high efficiency satellite transmitter comprises an RF amplifier chip in thermal contact with a radiant cooling element via a heat conducting element. The RF amplifier chip comprises an active layer disposed on a high thermal conductivity substrate having a thermal conductivity greater than about 1000 W/mK, maximizing heat conduction out of the RF amplifier chip and ultimately into outer space when the chip is operating within a satellite under normal transmission conditions. In one embodiment, the active layer comprises materials selected from the group consisting of GaN, InGaN, AlGaN, and InGaAlN alloys. In one embodiment, the high thermal conductivity substrate comprises synthetic diamond.

The invention discloses a method for processing signals of pico-satellite transmitters, which includes the following steps: digital baseband signals are converted into analog signals, image signals in the analog signals are then extracted, filtered and amplified, so that processed image signals are obtained, the processed image signals are mixed with radio frequency local oscillation, so that mixed signals are obtained, and finally, the mixed signals are filtered and amplified, so that radio frequency signals are obtained. The invention also discloses a device for processing signals of pico-satellite transmitters. The invention adopts a primary up-conversion structure to replace the secondary up-conversion structure of the conventional transmitter, dispensing with a first-stage medium-frequency local oscillator and a first-stage mixer on the link, consequently, the area of the circuit is reduced, the power consumption and complexity of the circuit are decreased, the primary spectrum shifting process is reduced, and under the premise of guaranteeing the good output characteristics of a digital-to-analog converter, the invention can effectively enhance the performance and stability of the whole transmission link.

Disclosed is a sensing apparatus, a network system, and a controlling method on the basis of a satellite. A satellite-based sensing network system, comprising: a plurality of satellite transmitters that collect information on a peripheral environment and an operating state, and transmits it to peripheral satellites; a satellite wireless receiving/display device that directly receives and displays the information collected from the satellites; a ground control center that receives, stores, and analyzes the information collected from the satellites; and a management center that maintains and repairs the satellite transmitter based on the analyzed results.

The invention discloses a method for connecting upper and lower coordinate systems of a deep mining well on the basis of pseudolite and inertial information. The method comprises the following steps of: firstly distributing a plurality of pseudolite launchers on the characteristic points of different directions of the upper part of a shaft according to a cross-section diagram of the mining well, and determining coordinates of the pseudolite launchers by utilizing a total station; respectively fixing an inertial measurement system at the two ends of the top part of a tank cage, measuring initial coordinates of inertial measurement units by adopting the total station, respectively and accurately measuring lever-arm values relative to the centers of the inertial measurement units by using thetotal station; obtaining pseudorange and carrier phase observation values by the pseudolite launchers distributed on the inner wall of the shaft; obtaining angular velocity and acceleration information by utilizing the inertial measurement units; carrying out tight-combination data resolving on the stored inertial data and pseudolite data by utilizing a PC terminal. The method disclosed by the invention has the advantages that the observation values with high accuracy can be rapidly obtained by utilizing the tank cage device, so that the disadvantages of the traditional methods restricted bytemperature, humidity and construction are overcome, the labor and materials are saved and the production is ensured.

A satellite transmitter module for accepting input signals and emitting output signals for uplink transmission. The module includes a transmitter unit that includes i) transmitter circuitry, ii) at least one input port, iii) and at least one output port. At least one heat sink coupled to the transmitter unit includes a plurality of heat sink fins, wherein at least two of the plurality of heat sink fins are of different heights. A fan is capable of generating air flow parallel with the plurality of heat sink fins. The module further includes an outer enclosure that i) encloses the transmitter unit and the plurality of heat sink fins and ii) is impermeable to the air flow generated by the fan. The outer enclosure includes an enclosure cross section shape that is substantially similar to the at least one heat sink cross section shape defined by the height of each of the plurality of the heat sink fins.

An apparatus for simultaneous calibration and communication of active arrays of a satellite may include a base transmitter, a satellite receiver, a satellite transmitter, a base receiver, and at least one computer. The apparatus may simultaneously transmit and receive a calibration carrier and a communication carrier at different frequencies in order to calibrate the apparatus using the calibration carrier without interrupting the communication carrier. The use of different frequencies may avoid interference between the calibration and communication carriers.

A tracking module (25) processes the determined correlations to track a carrier of the received composite signal for estimation of a change in phase over a time period between a receiver antenna (17)and one or more satellite transmitters that transmit the received signal as the receiver changes position with respect to an initial position during the time period. A relative position estimator estimates (32) the relative position of the navigation receiver with respect to an initial position over the time period time by time-differencing of the phase measurements of the one or more tracked carrier signals. Bias estimators (e.g., 34, 36, and/or 27) can estimate or compensate for errors in initial position and temporal changes in receiver clock and tropospheric delay.

A satellite includes: at least one optical photography instrument including a main lens having an optical axis and the optical instrument having a field of view; at least one launcher interface system, intended for being removably secured to a satellite interface system of a launcher of the satellite; a linking device between the launcher interface and the optical instrument extending substantially parallel to the optical axis of the main lens between an upper end and a lower end; the launcher interface system is connected to the linking device by the lower end and the optical axis of the optical instrument is directed from the upper end towards the lower end of the linking device, the launcher interface system being outside the field of view of the instrument.