Topcon Positioning Systems, Inc.

Timur G Kelin

Nikolay Afanasievich Vazhenin

Dmitry A Pyatkov

Dmitry D Murzinov

Alexey S Volkovskiy

Nickolay A Vazhenin

Andrey V Zasorin

A method and system for signal reception and processing, and more particularly for reducing the effects of random additive impulse interference is provided.

Quadrature impulse noise remover

A multi-channel sequential Viterbi decoder includes: an input buffer, a 'Read Data from Input Buffer' signal driver, a processing unit selector, a decoder channel parameters registers unit, a processing unit for a 'Reset Path Metrics' command, a processing unit for a &#x201c;Set Path Metric Value for the Given Path Number&#x201d; command, a processing unit for a &#x201c;Get Single Bit from the Path with Given Number&#x201d; command, a processing unit for a &#x201c;Process Input Samples&#x201d; command, a memory for storing decoding paths and path metrics, a unit for generating an address for the memory, and data buffers for decoder channels output.

Multi-channel sequential Viterbi decoder

Navigation data processing system, comprising a navigation receiver that receives a positioning signal; a data communication subsystem comprising a plurality of data communication units for receiving correction signal and routing it to the navigation receiver, and conversion interfaces for communicating the correction data in a common format. The navigation receiver includes a navigation subsystem that generates augmented navigation data based on the positioning and correction signals. A user terminal displays the augmented data. Navigation receiver includes a profile database comprising a plurality of profiles for receiving the correction signal; a script database comprising commands for controlling a particular data communication unit. Navigation receiver sets up communication to the correction signal source, processes the positioning and correction signals and generates the augmented data based on a script and a profile of the data communication unit and the interface converter.

Method and apparatus for controlling data communication units in navigation receiver

A method of estimating signal-to-noise ratio in a Viterbi decoder comprising: setting a threshold SNR value; determining a dependence on SNR of the average decoding path length; filling branch metrics matrix, minimal path metrics matrix, path metrics matrix and paths matrix with initial values; receiving packets from a communication channel; calculating the matrices that contains paths stored during operation of Viterbi algorithm in its rows, and a minimal path metrics matrix, including calculating an estimate of a decoding path length, where all the paths converge, based on the paths matrix; calculating current SNR estimate using an estimate of a decoding path length, based on results of previous steps; setting a decoder control signal to an active state if the current estimated SNR does not exceed the threshold, and to an inactive state otherwise; if the decoder control signal is in active state, the branch metrics matrix, the minimal path metrics matrix, the paths metrics matrix and the paths matrix are filled with the initial values; generating a decoded symbol; and repeating the steps on a next packet if one is available.

Method and apparatus for signal-to-noise ratio estimation in convolutional codes (Viterbi) decoder

Antenna identification data is transferred over a regular channel that is normally used for transferring navigation signals. Modulation of the received signal is used for transferring the portable antenna parameter data. Antenna identifications and parameters are written into a portable antenna module. The antenna module is attached to a radio receiver. The antenna module and the receiver are powered up. The portable antenna module receives radio signals that are amplified in a low-noise amplifier. Then, a level of the output signal is discretely modulated in the amplitude modulator and the signal is transferred to the radio receiver. The discrete fluctuations of the level of the signal are determined in the amplitude demodulator. The fluctuation of the level of the signal carries the information about the identification parameters of the portable antenna module. An analog-to-digital conversion of the determine signal fluctuation is performed in an analog-to-digital converter. The converted digital signal is used for receiving data related to the type and parameters of the portable antenna module.

Method and system for identification of portable antenna modules

A multi-channel sequential Viterbi decoder includes: an input data buffer, a 'Read Single Data Word from Input Data Buffer' signal driver, a processing unit selector, a decoder channel parameters registers unit, a processing unit for the 'Reset Path Metrics' command, a processing unit for the &#x201c;Set Path Metric Value for the Given Path Number&#x201d; command, a processing unit for the &#x201c;Get Single Bit from the Path with Given Number&#x201d; command, a processing unit for the &#x201c;Process Input Samples&#x201d; command, a decoding paths and path metrics RAM, a unit for generating current decoder channel base address for the decoding paths and path metrics RAM, a unit for generating cell address for the decoding path and path metric RAM, and a data buffers unit for decoder channels output.

Growing community of inventors

Moscow, Russia

Timur G Kelin