Fujitsu Corporation

Fujitsu Ten Limited

Masaki Hiromori

Kimihisa Yoneda

Seiji Matsuzaki

Hiroyuki Matsuo

Yuji Kamura

Masato Hashizume

Etsuo Kakishita

Megumi Shibata

Satoshi Tomie

Toshiaki Asai

Yoshinari Oshio

Hirofumi Fujiyama

Hirokazu Ito

A method of fault notification in a communication apparatus, including terminating transmission of a signal over a transmission link; determining whether or not a specified fault notification signal is detected in a reception link and storing a determination result from the determining; and upon detection of a fault in the reception link after starting an operation, outputting a specified fault notification signal to the transmission link when the stored determination result is affirmative.

Fault notification method and communication apparatus

A radar apparatus has a code generator, a transmission section, a reception section, a delay section, a despreading processor, a correlation value detector, a target detector, and an adjustment section. The transmission section transmits a signal modulated with a spectrum spread code. The reception section receives a direct wave from the transmission section and a reflection wave of the transmitted signal from a target. The delay section delays the despread code stepwise. The despreading processor performs a despreading processing with respect to a signal obtained from the reflection wave received, with using the despread code delayed. The correlation value detector detects a correlation value from data output from the despreading processor. The adjustment section adjusts a phase shift between the spectrum spread code and the despread code so that a correlation strength of the direct wave is equal to or larger than a predetermined value.

Radar apparatus

A radar device includes a code generator, a transmission section, a reception section, a delay section, a despreading process section, a correlation value detection section, a target detection section, an estimation section, an acquisition section, and a correction section. The estimation section estimates a reception intensity of a reflection wave from a target located at a first distance on a basis of a detected correlation value. The acquisition section acquires a cross-correlation value between the first distance and a second distance, on a basis of the estimated reception intensity of the reflection wave from the target located at the first distance, a delayed despreading code used to detect a correlation value for the first distance and a delayed despreading code used to detect a correlation value for the second distance. The correction section corrects the correlation value for the second distance on a basis of the cross-correlation value.

Radar device

A radar includes a transmission signal processing system, a reception signal processing system, an auxiliary signal processing system, a transmission-signal input unit, and a search determination unit. The transmission signal processing system transmits a transmission signal. The reception signal processing system receives and processes a reflected wave at a target. The auxiliary signal processing system is separate from the reception signal processing system and has the same configuration as at least a part of the reception signal processing system having a low operation speed. The transmission-signal input unit inputs a signal generated in the transmission signal processing system to the auxiliary signal processing system directly. The search determination unit makes a determination on the search for the target on the basis of processing results of the received reflected wave by the reception signal processing system and the directly input signal by the auxiliary signal processing system.

Radar

A transmission-reception apparatus includes a transmission section, a reception section, a transmission control section, a signal detection section, and an operation determination section. The transmission section transmits a signal to a surrounding space. The reception section receives the signal from the surrounding space. The transmission control section controls the transmission section to transmit the signal in a pulse shape. The signal detection section detects level of the signal received by the reception section. The operation determination section determines as to whether or not a timing at which the level of the received signal exceeds a first determination level is within a first time period on the basis of detection result and a timing at which the transmission control section controls the transmission section to transmit the signal in the pulse shape, to determine as to whether or not the transmission section and the reception section operate normally.

Transmission-reception apparatus and operation determination method thereof

In an SDH transmission unit, a tributary block includes a plurality of routing blocks for accommodating low speed line signals of a predetermined capacity and performing line selection processing of the low speed line signals to be interfaced with a high speed block in accordance with a form of a tributary network. The form of the tributary network includes various line speeds and network configurations. At least one of the routing blocks serves, when the low speed line signals accommodated therein do not fully occupy the predetermined capacity, as a master block which accommodates at least one of the other routing blocks as a slave block in order to accommodate the low speed line signals accommodated in the other routing block.

Add-drop multiplexer in an SDH transmission unit

A transmission device and an integrated circuit improved in quality and reliability of digital transmission control. A memory stores an input signal, write address generating means generates a write address for writing in the memory, and read address generating means generates a read address for reading from the memory. Phase state monitoring means monitors a transition from a steady phase state in which writing/reading in/from the memory is normally performed or from a startup state to a coincident phase state in which address values of the write and read addresses coincide with each other or to an unstable phase state in which a phase fluctuation margin is one-sided. When the coincident phase state or the unstable phase state is detected, reset signal output means outputs a reset signal to the write and read address generating means such that the phase relation between the write and read addresses is brought to an optimum phase relation.

Growing community of inventors

Kanagawa, Japan

Masaki Hiromori