Sony Corporation

Sony Semiconductor Solutions Corporation

Hideki Awata

Katsuyuki Tanaka

Hideki Takahashi

Masayuki Takada

Manabu Nitta

Naoki Yoshimochi

Yasushi Katayama

Kazukuni Takanohashi

Katsumi Takaoka

Tetsuhiro Futami

Koichiro Teranishi

Suguru Houchi

Toshimasa Shimizu

Jason Sanmiya

Sotaro Ohara

Yutaka Takagi

Keita Izumi

Shinji Inoue

Tsunetomo Nakazato

Gaku Hidai

The presence or absence of a preamble is detected with accuracy in a reception apparatus that receives a signal including a preamble. A reception section receives a subframe including a subframe preamble and a message and a frame including a frame preamble. A processing section performs a process of detecting the presence or absence of the subframe preamble according to whether or not a given relation holds between a reception timing of the subframe preamble and a reception timing of the frame preamble. A message decoding section extracts the message from the subframe and decodes the message in a case where the presence of the subframe preamble is detected.

Reception apparatus and reception method

The present disclosure relates to a signal processing apparatus and method that enables to reduce required power. In the signal processing apparatus, a RTC of a main chip and a RTC of a power supply chip are synchronized before power supply of the main chip is stopped, and the RTC of the main chip is synchronized with the time of the RTC of the power supply chip after the power supply of the main chip is restored. In this way, the RTC uses continuous time information before and after the stop. The present disclosure is capable of being applied to, for example, a GPS module in which a digital circuit includes a plurality of chips.

Signal processing apparatus and method

To provide a receiving device which is capable of reducing average power and peak power by holding pseudo synchronization of a satellite signal during a sleep period. Provided is a receiving device including a receiving unit for receiving a signal from a satellite, a frequency conversion unit for converting a frequency of the received signal into a predetermined intermediate frequency, a synchronization acquisition unit for carrying out synchronization acquisition and for detecting a carrier frequency, and a synchronization holding unit for assigning and setting, per satellite, a phase of the spread code and the carrier frequency to each of a plurality of channels independently provided in a corresponding manner to a plurality of the satellites to synchronously hold the spread code and a carrier and also for demodulating a message included in the intermediate frequency. The synchronization holding unit includes a spreading code generation unit for generating a spreading code synchronized with the spread code, and in a sleep period in which a positioning operation is not carried out, the synchronization holding unit causes only the spreading code generation unit to operate and a counter that the synchronization holding unit refers to also operates.

Receiving device, receiving method, computer program, and portable terminal

A signal receiver including an input that receives a plurality of signals from a respective plurality of channels; a multiplexer unit that receives the plurality of signals from the input and that selects, in a time-division manner, one of the plurality of signals; and at least one phase difference detector that receives the selected signal from the multiplexer unit, a number of the at least one phase difference detectors being less than a number of the plurality of channels.

Signal receiver, control method of signal receiver, and GPS device utilizing the signal receiver and method

A communication system includes a phase-locked loop that maintains synchronization of a reception signal. The phase-locked loop includes a loop filter that has a circuit configuration m for an m-th order phase-locked loop including a circuit configuration n for an n-th order phase-locked loop (m&#x3e;n), and a switching section that switches circuit configurations, which are activated in the loop filter, between the circuit configuration n and the circuit configuration m.

Communication system, phase-locked loop, movable body and communication method

A satellite signal receiver apparatus by which the hardware scale can be suppressed while high speed synchronization is assured. A carrier frequency component is removed from a satellite signal. Then, adding those of signals obtained after every period interval of spread spectrum codes and signals stored in a memory which have a same phase at the period intervals and writing an addition result back into the memory are repeated by a number of times corresponding to plural periods thereby to accumulate signals corresponding to sums of the signals added over the plural periods at the period intervals into the memory. Then, correlation calculation is performed between the signals for the one period of the spread spectrum codes corresponding to the plural periods and a spread spectrum code of the receiver side to detect a correlation point between the satellite signal and the receiver side spread spectrum code.

Satellite signal receiver apparatus and satellite signal reception method

A satellite-signal reception-processing apparatus for receiving signals, which each have completed a spectrum-spreading process using a spreading code, from a plurality of artificial satellites. Then, on the basis of the received signals, the apparatus computes its own position and velocity. The apparatus includes a position-computation satellite determination section for searching for a set of specific artificial satellites each having its locus known and the time of transmission of its spreading code also known, using this set to compute the position of the apparatus. The apparatus also includes a velocity-computation satellite determination section for searching for a set of particular artificial satellites each having its locus known and the frequency of its carrier determined to be a stable frequency, and using this set to compute the velocity of the apparatus.

Method and apparatus for computing position and velocity of receiver using independently-derived sets of satellites

The present invention is intended to provide the synchronization acquisition of signals received from four GPS satellites in a short time and with stability by the time in which an intermediate frequency carrier error of good accuracy can be obtained at the time of power-on sequence, for example. Prerequisites are that at least one GPS satellite signal be in the synchronization hold state, its intermediate frequency carrier frequency be known, the orbit information about that GPS satellite be stored in a storage section, and the position and current time of the GPS receiver be known. Under these prerequisites, an intermediate frequency carrier error is computed from the intermediate frequency carrier frequency, the position and velocity of the GPS satellite obtained from the orbit information and the current time, and the position of the GPS receiver. The intermediate frequency carrier frequency is corrected by the computed intermediate frequency carrier error. The signals received from other GPS satellites are acquired by use of the corrected intermediate frequency carrier frequency.

GPS reception method and GPS receiver

A GPS receiver that is capable of acquiring a GPS signal from a plurality of GPS satellites efficiently and at a high speed, and that is capable of performing a positioning calculation with a high degree of accuracy. The FFT processing result of the addition result from the PN code, stored in the memory, is multiplied by the FFT processing result of the IF data (the received data), stored in the memory, and by inverse-diffusing this result, a correlative value is obtained. By repeating this process while changing the combination of the PN codes to be added, and the synchronization acquisition processing, by a plurality of PN codes, is performed quickly with only a small amount of processing based on these results.

GPS receiver and receiving method

The at least five simultaneous equations include at least five unknown quantities, namely, a reference time, an error of a clock for measuring a diffusion-code reception time for each of the satellites and the 3-dimensional coordinates of the receiver. The diffusion code is transmitted from each of the satellites at a diffusion-code transmission time expressed as a sum of a time having a value represented by digits expressing a number equal to or greater than one unitary time corresponding to one period of the diffusion code and a time having a value represented by digits expressing a number smaller than the unitary time. The time represented by the digits expressing a number equal to or greater than the unitary time is represented by a sum of the reference time which is a time common to all the satellites and the differential time which varies from satellite to satellite. Accordingly, the position of a receiver can be found even in a condition where latest time information cannot be obtained or a condition where a signal transmitted by each satellite is weak such as a condition immediately following activation of the receiver so that a diffusion-code transmission time ti of the satellite cannot be confirmed.

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Gunma, Japan

Hideki Awata