Kabushiki Kaisha Toyota Chuo Kenkyusho

Denso Corporation

Toyota Jidosha Kabushiki Kaisha

Noriyoshi Suzuki

Kenji Ito

Junichi Meguro

Yoshiko Kojima

Tatsuya Iwase

Tsutayuki Shibata

Hiroaki Hayashi

Hisanori Uda

Tomohisa Harada

Yuusuke Watanabe

Yusuke Watanabe

Akira Miyajima

Mitoshi Fujimoto

Chisato Endo

Nobuo Itoh

Kazuya Shitaoka

Junji Imai

A positioning device or a speed measuring device includes: a satellite information acquisition portion that acquires satellite information including information related to a position of multiple satellites and information related to a distance between each of the multiple satellites and a mobile body or a relative speed with the multiple satellites; an attitude detection portion that detects an attitude of the mobile body; a relationship calculation portion that calculates a positional relationship or a speed relationship between an installation location of each of the multiple satellite antennas on the earth and a positioning target location; and a calculation portion that calculates a position of the positioning target location on the earth or a speed at the positioning target location.

Positioning device, speed measuring device, and computer program product

A sensor error correcting apparatus is provided with: a roll angle estimator configured to estimate a roll angle on the basis of a yaw rate of a moving body, a wheel speed, and lateral acceleration; a converter configured to convert the yaw rate to a horizontal yaw rate, on the basis of an estimated roll angle; and a zero point corrector configured to compare an azimuth change amount obtained by integrating the horizontal yaw rate in a turning period, which is from a start of turning of the moving body to an end of the turning, with an azimuth change amount of the velocity vector in the turning period, and configured to correct the measured lateral acceleration.

Sensor error correcting apparatus and method

An image pickup device picks-up forward images, and a GPS information acquiring section acquires satellite information that includes Doppler frequencies. A position/velocity vector computing section computes a velocity vector by using the Doppler frequencies. A locus computing section computes a locus of positions of ones own vehicle. A projected image generating section generates, from the forward images, projected images that are projected onto a road surface. A local map generating section records road surface images, that are obtained for respective points on the locus of ones own vehicle, at respective regions of a local map that is determined on the basis of a traveling direction of a moving body at each point on the locus and a set position and a posture of the image pickup device. Due thereto, a local map generating device can, by a simple structure, generate a highly accurate map.

Local map generating device, local map generating system, global map generating device, global map generating system, and program

A vehicle direction estimation section estimates an absolute direction of a heading direction of a vehicle based on GPS information and vehicle information. A satellite direction estimation section estimates an absolute direction of a target satellite of several satellites for positioning based on corresponding GPS information, and estimates a relative direction of the target satellite with respect to the heading direction based on the estimated absolute direction of the heading direction and the estimated absolute direction of the target satellite. A shield determination section determines a shielded state of the target satellite by determining whether a signal strength of a satellite signal from the target satellite is greater than a threshold value relative to a target partition of several partitions into which a three-dimensional sphere with respect to the heading direction is divided, the target partition which the calculated relative direction of the target satellite belongs to.

Satellite signal determination apparatus

The present invention provides a position estimation apparatus, mounted at mobile object, including: an acquisition section that acquires transmission source information transmitted from each plural information transmission sources including, information relating to a position of information transmission source, information relating to a distance between information transmission source and mobile object, and information relating to a relative velocity of mobile object with respect to information transmission sources; a trajectory calculation section that calculates, over predetermined duration, a trajectory of mobile object by integrating velocity vectors of mobile object obtained based on transmission source information; and an estimation section that estimates, as a position of mobile object, a position for which trajectory is translated such that a difference between, distances between a plurality of points at different times on trajectory and respective information transmission sources, and acquired distances between respective information transmission sources and mobile object, is minimum.

Position estimation apparatus and computer readable medium storing position estimation program

A positioning apparatus includes: a first positioning device for calculating a reception position of a GPS receiver with respect to each combination of satellites based on a pseudo distance from each positioning satellite to the reception position; a component error calculator for calculating an error of at least one component in a calculation result of the first positioning device; a pseudo distance error calculator for obtaining a relation equation between the error of the at least one component and an error of the pseudo distance, and for solving simultaneous equations comprising the relation equation so that the error of the pseudo distance with respect to each positioning satellite is calculated; and a second positioning device for correcting the reception position based on the error of the pseudo distance.

Positioning apparatus for calculating and correcting reception position and speed and method for the same

A method and apparatus for receiving a modulated signal which consists of N subcarriers containing N-L (L&#x3c;N) nullcarriers and in which an effective symbol has a length T, and a frequency interval between two adjacent subcarriers of the N subcarriers is/T. The method includes estimating an excess delay of a delayed wave, and deciding a part of the symbol regarded as a to-be-used symbol, based on the estimated excess delay, where a length of the decided part is TM/N (M&#x3c;N) within the effective symbol length T which is decided so as not to contain a part of the symbol suffering from a waveform distortion caused by the delayed wave; and decomposing a complex digital signal which is quadrature-detected at sampling intervals T/N into L subcarriers by use of M samples of the signal within the to-be-used symbol part by means of a matched filter.

Multicarrier demodulation method and apparatus, and multicarrier modulation method and apparatus

A receiver configured to receive a plurality of signals k (k=1, 2, . . . , M) allocated in a first frequency band. The receiver includes a frequency conversion section for reallocating the signals k in a second frequency band for sampling by a single AD converter at a sampling frequency fsuch that digital data of the sampled signals k are obtained in a third frequency band extending from zero Hz to a frequency represented by f/2; and a signal extraction section for extracting a target base band signal k from the digital data obtained by the AD conversion section. The frequency conversion section performs the reallocation in such a manner that at least a frequency represented by Jf/2 (J is an integer) is located between the frequencies of at least two of the signals k and that the sampled signals do not overlap.

Receiver apparatus

An adaptive communication apparatus for use in a multicarrier transmission system in which data sequence to be transmitted is divided into a plurality of data sequences, and these data sequences are converted into a high-frequency signal including a plurality of carriers allocated different frequencies and radio-transmitted in parallel. In the adaptive communication apparatus, a received high-frequency signal is separated into a plurality of carriers by a wave separator. The frequency characteristic of the received high-frequency signal is corrected by a frequency characteristic compensation unit. The frequency characteristic compensation unit is controlled by a controller through use of the high-frequency signal subjected to signal processing by the frequency characteristic compensation unit and the wave separator. The high-frequency signal thus processed by the frequency characteristic compensation unit and the wave separator is demodulated by a demodulator in order to output a plurality of data sequences corresponding to the respective carriers. The original data is reproduced by a parallel-to-serial converter from the plurality of data sequences corresponding to the respective carriers.

Growing community of inventors

Nagoya, Japan

Noriyoshi Suzuki