3269 results about "Satellite navigation" patented technology

A method and system for precise position determination of general Internet Protocol (IP) network-connected devices. A method enables use of remote intelligence located at strategic network points to distribute relevant assistance data to IP devices with embedded receivers. Assistance is tailored to provide physical timing, frequency and real time signal status data using general broad band communication protocols. Relevant assistance data enables several complementary forms of signal processing gain critical to acquire and measure weakened or distorted in-building Global Navigation Satellite Services (GNSS) signals and to ultimately extract corresponding pseudo-range time components. A method to assemble sets of GNSS measurements that are observed over long periods of time while using standard satellite navigation methods, and once compiled, convert using standard methods each pseudo-range into usable path distances used to calculate a precise geographic position to a known degree of accuracy.

A position determining device is disclosed comprising a satellite navigation receiver for automatically providing computed position information, when the device has changed its position relative to a predetermined location, to a paging transmitter for transmission to a paging receiver for readout of the computed position information. The readout may be in the form of coordinates and may be accompanied by a message or alarm. The device may be configured as a portable unit of small size and economical manufacture.

The satellite navigational system integrated with the tilt measurement system capable of precise measurement of the actual coordinates of the mobile unit that moves along a track with variable tilt is disclosed. Using the integrated satellite/tilt measurement system, a plurality of 3 dimensional lines separated by optimal swathing offset vector can be formed and followed in order to provide field guidance during a precision farming operation across variably inclined terrain.

A self-learning assisted hybrid vehicle system that includes a main power source for providing power to the vehicle, a supplemental power source for providing supplemental power for providing power to the vehicle and an electric motor or other mechanical system for driving the vehicle. The system also includes a self-learning controls unit that receives and stores information from a plurality of inputs associated with the vehicle. The self-learning controls unit uses the information to make predictions about future driving conditions of the vehicle to efficiently utilize the power sources of the hybrid vehicle.

The invention discloses a configurable multi-mode multi-band satellite navigation receiving method and a radio frequency front end module constructed by the method. The front end module can receive signals of satellite navigation and positioning systems such as a global positioning system (GPS), the Big Dipper, a Galileo positioning system and a global navigation satellite system (Glonass), and comprises a configurable low-noise amplifier (LNA) with a buffer and an active balun, a folding passive mixer with a configurable frequency synthesizer, a configurable multi-mode filter, an automatic gain control (AGC) amplifier, a direct-current bias circuit, and a multi-mode multi-band program controlled and coded on-off control word from a receiving system. The radio frequency front end module can meet the requirement of multi-band multi-mode work through the control word programmed by the receiving system, has a simple and reliable structure, does not need complicated time division multiplexing control system and off-chip module, has low cost and high flexibility, and improves the noise performance of the radio frequency front end of the whole receiver and multi-mode multi-band signal processing capacity; and a one-channel signal is input into the module, and the module outputs a two-channel differential signal. The receiver can be used for receiving and processing multi-mode satellite navigation signals asynchronously, and receiving and processing satellite navigation signals with the required mode in different time intervals according to the requirement.

The invention belongs to the satellite navigation and positioning technical field and discloses a low earth orbit satellite-based satellite-earth differential real-time precise positioning method. A low earth orbit satellite is utilized to broadcast the observation data and real-time orbit data of the satellite-borne GNSS (Global Navigation Satellite System) receiver of the low earth orbit satellite to the ground; and after receiving the differential information broadcasted by the low earth orbit satellite, a ground receiver generates a double-difference observation value consisting of the differential information and a local GNSS observation value and performs pseudorange-based moving base station DGNSS (Differential Navigation Satellite System) positioning and carrier phase-based moving base station RTK (Rea-time kinematic) positioning. According to the positioning method of the invention, the global mobile low earth orbit satellite platform is adopted as a reference station, so that real-time precision differential positioning service in the whole world can be realized, and the method does not depend on the distribution of ground reference stations; and a user can realize differential real-time precise positioning just through using a single receiver, and therefore, the method is free of operating range restrictions, and data communication links are not required to be considered.

The invention discloses a navigation method for an unmanned aerial vehicle, which is characterized in that an air route detection module with an air route data reckoning function is additionally arranged on the unmanned aerial vehicle and is capable of reckoning real-time navigation data independent on satellite navigation according to parameters including flight attitude, navigational speed and height of airborne equipment, an existing satellite navigation device and existing inertial navigation equipment, which are on the vehicle in flight, are combined to generate combined navigation data, the air route detection module is used for continuously comparing the real-time navigation data with the combined navigation data and judging confidence level of the satellite navigation according to comparison data. When satellite navigation is normal, the combined navigation data are preferentially used by the unmanned aerial vehicle for flight, and the real-time navigation data are temporarily suspended; and when satellite navigation is abnormal, the real-time navigation data are automatically started by the unmanned aerial vehicle for flight. By the navigation method, flight missions of the unmanned aerial vehicle can be guaranteed to be still completed according to preset air routes under the satellite navigation losing condition, and the unmanned aerial vehicle can be prevented from flying by no-fly zones or lands in no-landing zones, so that shortcomings of the prior art are overcome.

The invention discloses a system for remotely inquiring and reserving parking spaces of parking lots. The system consists of parking space sensors, concentrators, parking lot managing computers, a central processing computer, wired/wireless mobile communication networks, a parking space information receiving/transmitting device, a global positioning system (GPS) satellite navigation positioner, a city electronic traffic map, information processing management software, a parking-lot parking space database, a mobile phone payment system and a mobile phone short message platform. By the system, the parking lots nearby a destination and idle parking spaces in the parking lots can be inquired by vehicle owners in advance, vehicles can be driven to satisfying parking lots under the guiding action of a GPS navigation system, and satisfying idle parking spaces can be quickly and conveniently selected for parking the vehicles under the guiding action of a parking space distribution map, so that the phenomena of universally searching the parking lots aimlessly and universally searching the parking spaces in the parking lots aimlessly are prevented, and a large amount of time is saved and great convenience is provided for the vehicle owners. The vehicle owners can reserve the parking spaces in advance or eliminate the reservation.

The invention discloses a microminiature personal combined navigation system as well as a navigating and positioning method thereof. The system is composed of a subsystem installed on the foot part of a human body and a subsystem installed on the trunk position, wherein the subsystem installed on the foot part comprises an MEMS IMU (Micro-electromechanical Systems Inertial Measurement Unit), a magnetometer and a communication module; and the subsystem installed on the trunk position comprises a satellite navigation receiver, a Doppler velometer, an atmospheric pressure altimeter, a communication module and a microminiature navigation computer. The positioning method comprises the following steps of: collecting the MEMS IMU signal; modeling and correcting the random error of a gyroscope and an accelerometer; initially aligning an MEMS inertial navigation system; resolving strapdown inertial navigation, and correcting zero speed; carrying out combined navigation of the MEMS inertial navigation system/ satellite navigation receiver/ the Doppler velometer/ the magnetometer/ and the atmospheric pressure altimeter; and displaying the navigation result in real time. The microminiature individual combined navigation system is convenient to individually carry, individual real-time gesture fixing, velocity measurement and positioning can be realized, and whole and precise real-time navigation positioning information can be provided for pedestrians, operating personnel, soldiers, rescue workers and the like in the complex electromagnetic environment.

The invention relates to an AR (augmented reality)-based vehicle-mounted live-action safe navigation method which comprises the following steps of: acquiring a real-time image in front of a vehicle, carrying out characteristic object extracting treatment on the real-time image, and overlapping an object image attached with a recognition feature with the real-time image; extracting real-time navigation cartographic information from a satellite navigation map for overlapping to form a second image with the navigation information; and when one object attached with the recognition feature in the image triggers an alarm threshold value, promoting a driver to drive on an optimal safety route by an alarm image or sound. The method has the advantages that a novel navigation method which combines cartographic navigation software with the AR (augmented reality) technology can be realized, and a destination can be conveniently found; the destination can be combined with the live-action due to the live-action navigation provided by the invention, the destination is identified on the live-action, and the method is more convenient for users; and the distance between front and back vehicles can be displayed timely, and the deviation from a lane line can be prompted, thereby assisting in safe driving.

The invention discloses an instantaneous impact point based unmanned aerial vehicle non-collaborative real-time obstacle avoidance method. The instantaneous impact point based unmanned aerial vehicle non-collaborative real-time obstacle avoidance method comprises the steps of 1 performing obstacle detection, namely obtaining a relative motion state of an obstacle, 2 performing obstacle motion estimation, namely obtaining machine state information based on satellite navigation information and calculating a motion state of an inertial space obstacle, 3 performing impact conflict detection, namely judging whether obstacle impact occurs or not, 4 performing obstacle avoidance decision making, namely making an obstacle avoidance decision based on a detection result in the step 3, 5 performing obstacle avoidance route re-planning based on a quick expanding random tree algorithm considering an instantaneous impact point, namely introducing route evaluation heuristic information based on the instantaneous impact point and achieving obstacle avoidance route re-planning. The instantaneous impact point based unmanned aerial vehicle non-collaborative real-time obstacle avoidance method has the advantages of being simple in principle, easy to achieve, capable of improving unmanned aerial vehicle safety and the like.

A navigation system extends satellite navigation to divers, underwater vehicles, and surface vessels. The navigation system comprises a location reference unit and a plurality of sub-surface beacon units. The location reference unit includes a receiver to receive navigation signals from earth-orbiting satellites and/or an inertial navigation system. The location reference unit further includes control circuits to communicate with to sub-surface beacon units and to transmit location information to said sub-surface beacon units, and a transceiver to transmit location information to the sub-surface beacon units. The beacon units include control circuits to determine the location of the beacon unit based on location information received from the location reference unit, and a transceiver to receive location information from the location reference unit and to transmit location information to a guided unit to provide navigation assistance to the guided unit.

The invention relates to an indoor and outdoor seamless positioning system integrated with satellite navigation and a bluetooth technology, and a method thereof. The system comprises an outdoor satellite positioning module, an indoor bluetooth positioning module, an indoor and outdoor positioning fusion switchover module, and an electronic map display module. The outdoor satellite positioning module performs outdoor positioning by using GPS or Beidou Satellite navigation terminals. The indoor bluetooth positioning module performs indoor positioning by using a field intensity attenuation principle and a three-dimensional spatial positioning algorithm. The indoor and outdoor positioning fusion switchover module performs fusion, switchover, and integration on indoor and outdoor positioning methods according to strength of indoor and outdoor positioning communication signals and based on a federated kalman filter, so as to realize smooth transition of indoor and outdoor positioning. The electronic map display module displays positioning results based on two-dimensional electronic maps or indoor plane graphs, and three-dimensional building model scene graphs. The system can provide an indoor and outdoor integrated positioning function for intelligent mobile devices, and positioning speed is fast, and positioning precision is high.

An apparatus and a method are provided for recognizing driving environment for an autonomous vehicle. The apparatus includes a controller configured to receive navigation information from a satellite navigation receiver. The controller is further configured to receive map data from a map storage and image data from an image sensor regarding captured images from around a vehicle and distance information from a distance sensor regarding sensed objects positioned around the vehicle. The controller is also configured to determine a fusion method for information measured by the image sensor and the distance sensor based on a receiving state of the satellite navigation receiver and precision of the map data to recognize the driving environment.

The invention discloses a low power consumption and rapid oscillation starting crystal oscillator module with a transposable start oscillation condition, which consists of an inverting amplifier, an inverting reshaper chain, an automatic gain control loop (AGC), a feedback resistor, a power limitation resistor, and an external passive crystal oscillator and an external load capacitor. The inverting amplifier is provided with a transposable feedback resistor R1, and the transposable start oscillation condition of the crystal oscillator is realized; and the automatic gain control loop (AGC) is inserted between an input end and a bias end of the inverting amplifier, and the contradiction between the oscillation starting time and power consumption is solved. The invention also provides a highresistor realizing IC (integrated circuit) by adopting a transconductance amplifier of micro current source, and a transposable feedback resistor R1 for the oscillator amplifier branch circuit and a high resistor in a pi-shaped filter. The resistance value of the high resistance can be controlled by programming, the start oscillation condition of the oscillator can be adjusted through adjusting the feedback resistance R1, and reliable and quick start oscillation of the oscillator can be realized; and lower phase noise can be realized through adjusting the high resistor in the pi-shaped filter. The crystal oscillator circuit has the characteristics of low power consumption and rapid start oscillation, and can be used for the digital integrated circuit, such as a base band of various of satellite navigation allocation receptors, real time clocks (RTC).

The invention relates to a mobile navigation device, which alternately operates in first and second modes. In the first mode, a satellite positioning module is started up, a dead reckoning module is closed, and a processor calculates a position coordinate according to a satellite navigation signal. In the second mode, the satellite positioning module is closed, the dead reckoning module is started up, and the processor updates the position coordinate according to movement and rotation.

The invention provides a general satellite navigation signal interference source and a signal generating method thereof. The general satellite navigation signal interference source is mainly composed of a main control software module, an intermediate frequency interference signal generating module and a radio up-conversion circuit. The method mainly comprises the steps of: according to the control parameters of the interference signal input by users as interference mode, frequency points, bandwidth and power and the like, processing digital frequency synthesis to generate low-intermediate frequency digital signals, processing digital orthogonal up-conversion and D/A conversion for the low-intermediate digital signals, to attain intermediate frequency analogue signal output. The invention utilizes phase lock frequency synthesis theory to generate the local oscillation frequency of corresponding frequency points, mixes the radio frequency local oscillation signal of the local oscillation frequency and the intermediate frequency analogue signals via an orthogonal modulation, processes automatic gain control and accurate power control to output the attained radio frequency interference signals. The invention can simulate the interference condition of a receiver actually receiving satellite signals.

A method and apparatus for detecting and correcting anomalous measurements in a satellite navigation receiver is disclosed. Anomalous measurements are detected using the redundancy of observed satellite signals, or by analyzing the relationship between phase measurements at two frequencies when using dual frequency receivers. Upon determination that an anomalous measurement exists, the particular channel on which the anomalous measurement has occurred is determined. In addition, the extent of the anomalous measurement is estimated to produce an estimated error value. This information may then be used by the satellite navigation receiver in order to increase the accuracy of a navigation task.

The invention relates to a precise tracking and measuring method of a high dynamic signal of an air fleet link, belonging to the technical field of aeronautical data links and radio navigation, and aiming at providing a precise tracking and measuring method of the high dynamic signal the an air fleet link and an implementation structure to solve the problems in the prior art. The invention provides a system framework of the precise tracking and measuring method of the high dynamic signal of the air fleet link, which can be implemented on a digital signal processor (DSP) and a FPGA (field programmable gate array) of a circuit board, and overcomes the defects of the unfavorable precision of a traditional high dynamic receiver by utilizing a double-loop structure of a frequency tracking loop of carrier tracking and a phase locking loop as well as a code phase locking loop to realize the high precise tracking under a high dynamic condition. The method can be widely applied to satellite navigation receivers, range measurement systems and communication systems based on a quiescent carrier modulation direct sequence spread spectrum system.

The invention provides an ethernet-exchange-bus-based unmanned plane flight control system and method. The system comprises a flight control computer (ARM), a flight indication lamp control module (LED+), an ultrasonic sensor, a light stream sensor, a power management unit (PMU), a storage battery, an inertia management unit (IMU), a satellite navigation unit (GPS/BD+), a motor, and a steering engine. An Ethernet exchange chip (LAN swtich) is embedded into the flight control computer (ARM) and is connected with the flight control computer (ARM) by an LAN and is connected with a flight control peripheral module by an LAN. The system and method have the following beneficial effects: a communication link between an unmanned plane and the ground is simplified; a high-definition digital image can be returned to the ground in real time or be connected to the interne or be passed back to a command center; the visual navigation, obstacle avoidance, and image target identification tracking are supported; the communication demand of the unmanned plane formation flight is satisfied; the traditional IOSD equipment as well as the investment are saved; and the new function of the modularized smooth extension flight control is supported.

The invention discloses a signal acquisition system and a signal acquisition method for a satellite navigation receiver so as to realize compatible processing of a plurality of GNSS satellite signals. The system comprises a channel parameter control list, a data storage, a digital down-conversion and down-sampling module, and a related energy accumulation and signal acquisition module, wherein the channel parameter control list stores control parameters and state parameters of a plurality of logical channels; the data storage stores intermediate-frequency sample data of satellite signals received by the receiver according to the control parameters; the digital down-conversion and down-sampling module performs digital down-conversion and down-sampling operation on the intermediate-frequency sample data according to the control parameters and the state parameters to acquire satellite sample data with zero intermediate frequency and low sample rate; and the related energy accumulation and signal acquisition module completes satellite signal despread, related energy accumulation, and signal acquisition and output according to the control parameters and the state parameters.

The invention relates to a strapdown inertial/satellite integrated navigation detecting system and a simulation testing method thereof. The system comprises a strapdown inertial subsystem, a satellite navigation subsystem, a navigation module and a control and display module, wherein the control and display module is connected with the strapdown inertial subsystem and the satellite navigation subsystem respectively to transmit track information; the strapdown inertial subsystem and the satellite navigation subsystem are respectively connected with the navigation module to transmit angular speed, accelerated speed and satellite signals; the output end of the navigation module is connected with the control and display module to feed an integrated navigation result back to the control and display module to form a closed-loop system. The system has real error characteristics. According to the system, optional tracks can be generated and do not need to be carried by actual carriers, so that the research and development cycle of an integrated navigation system is shortened, and the research and development cost is reduced; the real-time dynamic simulation on carrier movement according to a preset track can be realized and finished, and the universality is very strong.

A satellite navigation device including a receiver having an adjustable code generator is described. The adjustable code generator is configurable to generate a set of spread-spectrum code signals. Each spread-spectrum code signal has a respective length corresponding to a repetition period. The set of spread-spectrum code signals includes first and second spread-spectrum code signals having distinct first and second lengths.