| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 121 | Method and apparatus for determining search center and size in searches for GPS transmissions | US09430619 | 1999-10-29 | US06429815B1 | 2002-08-06 | Samir S. Soliman |
| A system and method for determining the size and center of a search for global positioning system (GPS) satellites. The system and method uses information taken from a wireless communication device for which the location is sought. The information includes determinations as to what communication base stations are local to the wireless communication device and how far away each such base station is from the wireless communication system. | ||||||
| 122 | Method and apparatus for determining location using a coarse position estimate | US09773207 | 2001-01-30 | US06429809B1 | 2002-08-06 | Alkinoos Vayanos; Peter Gaal |
| Corrections to a coarse position estimate of the pseudorange receiving device are made based upon knowledge of the amount of error present in inaccurate information (e.g., the old Almanac and/or Ephemeris) used to estimate the coarse position. | ||||||
| 123 | GPS receiver utilizing a communication link | US09558692 | 2000-04-25 | US06400314B1 | 2002-06-04 | Norman F. Krasner |
| A precision carrier frequency signal for calibrating a local oscillator of a GPS receiver which is used to acquire GPS signals. The precision carrier frequency signal is used to calibrate the local oscillator such that the output of the local oscillator, which is used to acquire GPS signals, is modified by a reference signal generated from the precision carrier frequency signal. The GPS receiver locks to this precision carrier frequency signal and generates the reference signal. In another aspect of the invention, satellite almanac data is transmitted to a remote GPS receiver unit from a basestation via a communication link. The remote GPS receiver unit uses this satellite almanac data to determine approximate Doppler data for satellites in view of the remote GPS receiver unit. | ||||||
| 124 | Self-contained, self-surveying differential GPS base station and method of operating same | US09710742 | 2000-11-13 | US06380888B1 | 2002-04-30 | Daniel P. Kucik |
| A self-contained, self-surveying differential GPS base station system and method of operating same are provided. The system and method use a conventional differential GPS base station. The base station's National Marine Electronics Association (NMEA) data sentences identify a determined position of the base station and fix quality information associated with the determined position. The system and method automatically identify the determined position as an acceptable position when the fix quality information associated with the determined position satisfies a selected criteria which is stored on-site. The system and method then automatically average together each acceptable position to generate an updated position. The updated position is automatically supplied to the base station at a prescribed time for use by the base station in generating Radio Technical Commission for Maritime Services (RTCM) differential corrections for transmission over the air waves. | ||||||
| 125 | Method and data receiver device for reception of a radio signal containing correction data for a global navigation satellite system | US09369512 | 1999-08-06 | US06332070B1 | 2001-12-18 | Harald Bochmann; Volkmar Tanneberger |
| The data receiver device (100) of the present invention for reception of radio signals containing correction data for a global navigation satellite system includes at least two different radio receiving circuits (12,14) operating in three different frequency bands for receiving the radio signals containing the correction data; at least one demodulator (20) for conversion of these radio signals to a baseband; a memory for a frequency table (16) of frequencies of at least two different sources of the radio signals and for a decoding table (26) for decoding the radio signals and at least one decoding device (22) for decoding of the correction data from the radio signals. The at least one decoding device (22) is connected with the at least one demodulator (20) to receive the radio signals from it on the baseband and with the memory (26) for the decoding table for decoding of the radio signals. | ||||||
| 126 | Method and apparatus for collecting, processing and distributing differential global positioning system information using the internet | US08906176 | 1997-08-04 | US06324473B1 | 2001-11-27 | Ralph Eschenbach |
| An infrastructure for implementing DGPS virtual reference stations is disclosed. The virtual reference station infrastructure is comprised of a network of real DGPS reference stations coupled to a central computer system. The real DGPS reference stations may be coupled to the central computer by a set of radio receivers that transmit the pseudorange corrections from each real reference station to the central computer system. The central computer system processes the pseudorange corrections from all the real DGPS reference stations to generate a dynamic satellite error vector and a clock error for each satellite. The dynamic satellite error vector and satellite clock error for each satellite are transmitted to plurality of “virtual” references stations. The virtual reference stations combine the dynamic satellite error vector and the satellite clock error with a local position to generate the local pseudorange corrections (PRC) for the observable satellites. The local pseudorange corrections can be broadcast using the well known RTCM SC-104 format to mobile GPS receivers that are within the local are of the virtual reference station. The mobile GPS receivers can thus correct their position data using the pseudorange corrections broadcast the virtual reference station. | ||||||
| 127 | GPS receiver utilizing a communication link | US09766184 | 2001-01-18 | US20010028321A1 | 2001-10-11 | Norman F. Krasner |
| Methods and apparatuses for deriving an approximate Doppler for a satellite positioning system (SPS) receiver from an approximate location which is obtained from a cellular communication system information source. In one embodiment, an approximate location of the SPS receiver is derived from the information source and this approximation location is used to determine approximate Dopplers to a plurality of SPS satellites at a given time. The approximate Dopplers are then used to reduce processing time in either determining pseudoranges to the SPS satellites or acquiring signals from the SPS satellites. In another aspect of the invention, a reference signal is used to provide a local oscillator signal which is used to acquire SPS signals in an SPS receiver. This reference signal is extracted from a data signal modulated on a carrier frequency. The data signal on the carrier frequency is transmitted from, in one example, a wireless cell site which is communicating with the SPS receiver which has a cellular based communication receiver. | ||||||
| 128 | Collecting and reporting information concerning mobile assets | US09790371 | 2001-02-21 | US20010027378A1 | 2001-10-04 | Lynden L. Tennison; Steve C. Lampe |
| A mobile platform includes a GPS receiver system to collect position related information for storage in a database. Sensors further collect platform operational information for storage in the database. A control processor for the mobile platform collects the stored information for periodic transmission over a wireless communications link to a remote location for further processing and handling. The control processor is configured to periodically engage in data collection from the GPS receiver system and sensors at a first rate and remotely report any interim collected information over the wireless communications link at a second rate. Preferably, the first rate is greater than the second rate by integer multiple to most efficiently and economically utilize wireless communications resources. At the remote location, a central controller receives the mobile platform reported information for processing in accordance with tracking management applications. An interface to the central controller allows a user to control the information collection and reporting operations of the control processor (in the mobile platform) as well as the tracking management functions performed by the central controller. | ||||||
| 129 | SOLUTION SEPARATION METHOD AND APPARATUS FOR GROUND-AUGMENTED GLOBAL POSITIONING SYSTEM | US09396193 | 1999-09-14 | US20010020214A1 | 2001-09-06 | MATS A. BRENNER |
| Global positioning systems (GPSs) estimate positions of vehicles based on signals from earth-orbiting satellite transmitters. For accuracy and reliability reasons, these systems have traditionally not be used for critical phases of aircraft navigation and guidance, such as aircraft landings. However, recent years have seen the development of ground-augmented GPS systems for use in automatic landing systems. These augmented systems rely on broadcast correction data to correct positions estimates, or solutions, and thus provide more accurate position solutions. Unfortunately, the conventional methods of measuring accuracy in these augmented systems cannot adequately cope with loss of correction data or satellite signals and thus lead to more aborted landings than acceptable. Accordingly, the inventor devised a ground-augmented GPS system that incorporates a better method for determining the accuracy of its position solution. One exemplary embodiment determines a main position solution and one or more position subsolutions, with the main solution using all broadcast correction data and each subsolution using a respective subset of the correction data. Differences or separations between the main position solution and the subsolution are then used to determine accuracy, or protection, limits for the main position solution. Another embodiment uses Kalman filters to incorporate vehicle motion data into the calculation of the main solution and the subsolutions, enabling the determination of protection limits during periods lost GPS or correction data. | ||||||
| 130 | Motor vehicle warning and control system and method | US09473350 | 1999-12-28 | US06226389B1 | 2001-05-01 | Jerome H. Lemelson; Robert Pedersen |
| A system and method assist the driver of a motor vehicle in preventing accidents or minimizing the effects of same. In one form, a television camera is mounted on a vehicle and scans the roadway ahead of the vehicle as the vehicle travels. Continuously generated video picture signals output by the camera are electronically processed and analyzed by an image analyzing computer, which generates codes, that serve to identify obstacles. A decision computer mounted in the controlled vehicle receives such code signals along with code signals generated by the speedometer or one or more sensors sensing steering mechanism operation and generates control signals. Such code signals maybe displayed, and as synthetic speech or special sound generating and warning means used to warn the driver of the vehicle of approaching and existing hazards. The system may also use the control signals, particularly through application of fuzzy logic, to control the operation of the brakes and steering mechanism of the vehicle to avoid or lessen the effects of a collision. In a particular form, the decision computer may select the evasive action taken from a number of choices, depending on whether and where the detection device senses other vehicles or obstacles. | ||||||
| 131 | Enhanced differential GNSS carrier-smoothed code processing using dual frequency measurements | US09277341 | 1999-03-26 | US06198430B1 | 2001-03-06 | Patrick A. Hwang; Gary A. McGraw; John R. Bader |
| A method of generating a differentially corrected pseudorange residual in a differential global positioning system includes tracking at a base station first and second GPS signals, having first and second frequencies, from a first satellite. At the base station, a first pseudorange measurement is determined from the tracked first GPS signal. At the base station, a first smoothed pseudorange measurement is calculated from the determined first pseudorange measurement as a function of both the first and second GPS signals. The first smoothed pseudorange measurement is provided to a remote GPS receiver. The remote GPS receiver calculates the differentially corrected pseudorange residual as a function of the first smoothed pseudorange measurement provided by the base station. | ||||||
| 132 | Method and apparatus for determining time for GPS receivers | US342299 | 1999-06-29 | US6150980A | 2000-11-21 | Norman F. Krasner |
| A method and apparatus of determining the time for a global positioning system receiver is disclosed. Timing signals derived from a communication system, such as cellular phone transmission signals, are received by a GPS receiver and decoded to provide accurate time information. The timing signals may be in the form of synchronized events marked by timing indicators, or as system time information. The timing signals in combination with satellite position signals received by the GPS receiver are used to determine the position, of the GPS receiver. | ||||||
| 133 | Combined GPS positioning system and communications system utilizing shared circuitry | US343124 | 1999-06-29 | US6111540A | 2000-08-29 | Norman F. Krasner |
| A combined GPS and communication system having shared circuitry. The combined system includes an antenna for receiving data representative of GPS signals, a frequency converter coupled to the antenna, a frequency synthesizer coupled to the frequency converter, an analog to digital converter coupled to the frequency converter and a processor coupled to the frequency converter. The processor processes the data representative of GPS signals to determine a pseudorange based on the data representative of GPS signals. The integrated communication receiver includes a shared component which is at least one of the antenna, the frequency converter, the frequency synthesizer and the analog to digital converter. Typically, in certain embodiments the processor also demodulates communication signals received as well as controls the modulation of data to be transmitted as a communication signal through a communication link. | ||||||
| 134 | GPS receiver utilizing a communication link | US129599 | 1998-08-05 | US6064336A | 2000-05-16 | Norman F. Krasner |
| A precision carrier frequency signal for calibrating a local oscillator of a GPS receiver which is used to acquire GPS signals. The precision carrier frequency signal is used to calibrate the local oscillator such that the output of the local oscillator, which is used to acquire GPS signals, is modified by a reference signal generated from the precision carrier frequency signal. The GPS receiver locks to this precision carrier frequency signal and generates the reference signal. In another aspect of the invention, satellite almanac data is transmitted to a remote GPS receiver unit from a basestation via a communication link. The remote GPS receiver unit uses this satellite almanac data to determine approximate Doppler data for satellites in view of the remote GPS receiver unit. | ||||||
| 135 | Method and system for a differential global navigation satellite system aircraft landing ground station | US947390 | 1997-10-08 | US6023239A | 2000-02-08 | Karl L. Kovach |
| A differential GNSS ground station is disclosed which generates and broadcasts highly veracious GNSS satellite differential correction data suitable for use in the landing of aircraft. In this context, "veracious` includes the qualities of both accuracy and integrity wherein the broadcast differential correction data is corrupted by a lower level of errors than is customary for the current state of the art and the broadcast differential correction data includes reliable estimates of the noise errors and bias errors corrupting the differential corrections for each GNSS satellite signal. The ground station comprises at least two independent GNSS satellite signal receivers, a processing apparatus for collecting and processing information from the at least two independent GNSS receivers, and a transmitter for broadcasting the composite DGNSS correction signals over a distance. | ||||||
| 136 | Post-processing of inverse DGPS corrections | US954645 | 1997-10-20 | US6014101A | 2000-01-11 | Peter V. W. Loomis |
| A method for enhancing the accuracy of location coordinates and/or clock bias computed for a mobile user station that is part of a Satellite Positioning System (SATPS), such as GPS or GLONASS. A data processing station is provided with pseudorange corrections PRC(t;j;ref) for an SATPS reference station for each of M SATPS satellites (j=1, . . . , M; M.gtoreq.3) and with uncorrected location fix coordinates x'(t.sub.f), y'(t.sub.f)', z'(t.sub.f)' and/or b'(t.sub.f) for the mobile station for a selected location fix time t.sub.f. A matrix equation H(t.sub.f ;mob).DELTA.W(t.sub.f ;mob)=PRC(t.sub.f ;ref) relates a matrix .DELTA.W of location fix coordinate corrections for the mobile station to a matrix PRC(t;ref) of the pseudorange correction values, where H(t.sub.f ;mob) is an M.times.N matrix (M.ltoreq.N; N=3 or 4) with known entries computed from mobile station data. An inverse or pseudo-inverse matrix H(t.sub.f ;mob).sup.(-1) is formed satisfying the relation H(t.sub.f ;mob).sup.(-1) H(t.sub.f ;mob)=the identity matrix I, and the matrix .DELTA.W(t.sub.f ;mob)=H(t.sub.f ;mob).sup.(-1) PRC(t.sub.f ;ref) is computed. The entries of the matrix .DELTA.W(t.sub.f) are interpreted as additive corrections for the location fix coordinates x'(t.sub.f), y'(t.sub.f)', z'(t.sub.f)' and/or b'(t.sub.f) for the mobile station. Post-processing can be performed to apply the pseudorange corrections to the mobile station data. | ||||||
| 137 | Portable flight guidance and tracking system | US868203 | 1997-06-03 | US6005513A | 1999-12-21 | W. Mark Hardesty |
| A portable three-dimensional position and velocity data archiving system for use with an aircraft during flight testing and evaluations. The system includes a ground based system and an airborne system. Each system includes a GPS receiver electrically connected with a GPS antenna for receiving and interpreting GPS signals transmitted from a GPS satellite constellation. Each system also includes a radio communication device for transferring position and velocity data as well as error correction data and guidance cues between the ground and airborne systems. The portable system acquires, processes, archives, and provides precise three-dimensional position and velocity data for the aircraft in real time. Information regarding aircraft position, direction, velocity, acceleration and any correction needs referenced to a selected coordinate system is immediately presented to a vehicle piloting crew on analog as well as digital indicators. | ||||||
| 138 | Combined GPS positioning system and communications system utilizing shared circuitry | US652833 | 1996-05-23 | US6002363A | 1999-12-14 | Norman F. Krasner |
| A combined GPS and communication system having shared circuitry. The combined system includes an antenna for receiving data representative of GPS signals, a frequency converter coupled to the antenna, a frequency synthesizer coupled to the frequency converter, an analog to digital converter coupled to the frequency converter and a processor coupled to the frequency converter. The processor processes the data representative of GPS signals to determine a pseudorange based on the data representative of GPS signals. The integrated communication receiver includes a shared component which is at least one of the antenna, the frequency converter, the frequency synthesizer and the analog to digital converter. Typically, in certain embodiments the processor also demodulates communication signals received as well as controls the modulation of data to be transmitted as a communication signal through a communication link. | ||||||
| 139 | Apparatus and method for receiving position and control signals by a mobile machine | US62976 | 1998-04-20 | US6002362A | 1999-12-14 | Adam J. Gudat |
| A base station receives GPS signals from GPS satellites and transmits a combined differential GPS (DGPS) signal and a command signal. At least one pseudolite receives the DGPS and command signals and combines the DGPS and command signals with a pseudo-GPS signal. A GPS receiver on a mobile machine receives GPS signals from GPS satellites, and the combined signal from the pseudolite. The position signals are delivered to a machine position processor to generate a machine position signal. The command signals are delivered to a machine control processor to generate a machine control signal. The machine position signal and the machine control signal are delivered to a machine navigator to control the mobile machine. | ||||||
| 140 | Positioning system and fixed station and positioning apparatus for employing the same | US903433 | 1997-07-30 | US5990825A | 1999-11-23 | Toru Ito |
| DGPS data obtained from an FM broadcast wave is extracted by a DGPS data extraction section (226). Adjustment error, the accuracy of which is not very high, has been appended to correction data to be used in actual positioning correction within the obtained DGPS data. A correction value creation section (228) judges, from the contents of DGPS data, which data in a correction value table (230) may be read. The method of this judgment is predetermined. Then, the correction value is created by reading the corresponding correction value from correction value table (230). Next, the correction value and correction data are added in a DGPS data specifying section (232) to yield proper correction data. Position information having high accuracy can be obtained from the obtained proper correction data. | ||||||
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