Livermore, CA, United States

Time filter

Source Type

A method for measuring a signal-to-noise ratio when decoding Low Density Parity Check (LDPC) codes is provided. The method includes receiving from an input of a demodulator an input code word with strong or weak solutions, decoding the input code word in a LDPC decoder using a predetermined dependence of a mean number of iterations on the signal-to-noise ratio, recording a number of iterations performed during the decoding of the input code word, averaging derived values of the number of iterations for a specified time interval, estimating a signal-to-noise ratio based on averaged derived values of the number of iterations and based on the predetermined dependence of the mean number of iterations on the signal-to-noise ratio, and generating an output decoded code word.


A method of movement mode determination comprising measurement of vehicles position and orientation and calculation of movement parameters, a compass on the vehicle, is azimuthally oriented along the prevailing and is mostly used movement direction (forward direction), a movement vector measurement unit, is used for measuring the azimuth of movement vector. A calculation unit being used for measuring an angle between vehicle movement vector azimuth measured by the movement vector measurement unit and vehicle azimuth measured by the compass fixed on the vehicle; movement is regarded as backward if the calculated angle is greater than 90 degrees, and forward if the calculated angle is smaller than 90 degrees. Also, an apparatus for movement direction determination includes a compass and a computation unit and further comprises a movement vector measurement unit for determining vehicle movement azimuth and connected through a signal connection to the computation unit.


Patent
Topcon Positioning Systems | Date: 2017-02-08

Disclosed is a method for mapping network identifiers to a set of sensor modules that measure a three-dimensional action vector and that are sensitive to orientation in three-dimensional space. Each sensor module is mounted at a different position on a machine such that the orientation of each sensor module is different. The method includes one or two stages. In the first stage, the machine is placed in a stationary state, and measurements of a static action vector from a sensor module identified by a network identifier are correlated with expected measurements from a sensor module having a corresponding orientation and corresponding position. In the second stage, the machine is placed in a dynamic state, and measurements of a dynamic action vector from a sensor module identified by a network identifier are correlated with expected measurements from a sensor module having a corresponding orientation and corresponding position.


Patent
Topcon Positioning Systems | Date: 2015-09-02

An antenna system for global navigation satellite systems includes a ground plane, an active antenna disposed above the ground plane, and a passive antenna disposed below the ground plane. The active antenna includes a conducting ring substantially parallel to the ground plane. A radiating conductor passes through substantially the center of the conducting ring; the ends of the radiating conductor are electrically connected to the conducting ring. An excitation pin is electrically connected to the radiating conductor. A set of reactive impedance elements is electrically connected between the conducting ring and the ground plane. The set of reactive impedance elements is disposed substantially orthogonal to the ground plane. The passive antenna is similar to the active antenna, except the passive antenna does not have an excitation pin. The antenna system effectively suppresses multipath reception, and its compact size and light weight make it suitable for integration with a surveying pole.


Patent
Topcon Positioning Systems | Date: 2016-01-12

A digital filter for narrowband interference rejection, including modules of narrowband interference rejection connected in series, each of which includes the following elements connected in series: a block of successive vector rotation based on the CORDIC vector rotation algorithm for integers, a block of reduction of the length of the rotated vector to maintain the same number of bits for digital signal representation, a block of high-pass filters for orthogonal components of the reduced vector in order to remove the interference from zero frequency region. The filter can be implemented without multiplication.


Patent
Topcon Positioning Systems | Date: 2015-06-23

A system and method for scheduling tasks of a construction project includes dividing a plan for a construction project into a plurality of tasks. Each particular task of the plurality of tasks is defined by one or more parameters. The one or more parameters of each particular task are modified based on an operational model defining a sequence of actions for performing the particular task. A construction machine is assigned to each particular task based on the modified one or more parameters of the particular task. Each particular task is dispatched to the construction machine assigned to the particular task for presenting the sequence of actions for performing the particular task.


A system and method for providing guidance to a user of a construction machine include computing kinematic behavior of a construction machine based on data received from the construction machine while performing a task. The kinematic behavior is compared with a model for operating the construction machine for performing the task. Feedback data is sent to the construction machine based on the comparing to provide guidance to the user of the construction machine for performing the task.


Patent
Topcon Positioning Systems | Date: 2015-06-23

Systems and methods for automating a task of a construction machine include receiving machine data from a first construction machine and a second construction machine. A load balance of the first construction machine is determined based on the received machine data. A location on the first construction machine to release a load is determined based on the load balance. A message is sent to the second construction machine to control movement for releasing a load of the second construction machine at the determined location on the first construction machine.


Patent
Topcon Positioning Systems | Date: 2016-07-17

A method of estimating current SNR in a sequence of symbols, including receiving a signal representing an additive mixture y(t)=s(t)+n(t) of a sequence of phase-modulated symbols with fixed length and phase modulation s(t) and including white Gaussian noise (AWGN) n(t); separating quadrature components I_(Y )and Q_(Y )of the received signal in a quadrature mixer; determining a mean-square I of I_(Y); determining a mean-square Q of Q_(Y); determining a square/squared value of mean absolute value (modulus) |I|^(2); determining a square of mean value for quadrature component ]Q[^(2), where values of the quadrature component Q_(Y )are averaged taking into account a sign of a symbol received in a channel; determining a current absolute value (vector length) for {square root over (I_(y)^(2)+Q_(y)^(2))}; determining the current SNR based on I, Q, |I|^(2), ]Q[^(2 )and {square root over (I_(y)^(2)+Q_(y)^(2))}; and compensating for a systematic error of the current SNR.


Method of identification and compensation for inversion of the input bit stream when decoding LDPC codes includes obtaining a code word of the LDPC code from a demodulator output and writing the code word into a buffer memory, decoding the code word, calculating a syndrome for each iteration when decoding, making an analysis of converging the weight of the syndrome, generating an inversion feature for the input bit stream based on this analysis, continuing the decoding, if the inversion feature for the input bit stream does not give evidence of detecting inversion, resetting, if the inversion feature for the input bit stream shows inversion, the LDPC decoder and analysis parameters for the convergence of the weight of the syndrome, reading next code word from the buffer memory, and producing an inversion of this code word, and feeding the word to the decoder input to implement the next decoding operation.

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