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1. 发明专利

JPH06252707A SATELLITE COMMUNICATION EARTH STATION EQUIPMENT 失效
公开(公告)号：JPH06252707A
公开(公告)日：1994-09-09
申请号：JP4017293
申请日：1993-03-01
申请人： NEC CORP
发明人： GOTO YUJI
IPC分类号： H03J7/02 , H04B1/18 , H04B7/155
摘要： PURPOSE:To simplify and economize the configuration of a control station. CONSTITUTION:A logic section 11 controls a frequency synthesizer 12 with reception frequency switching information from a data processing section 21 prior to the system operation to receive a continuous wave common signal and controls changeover devices 18,20 to latch a reception frequency control signal 101 to a latch device 19. The logic section 11 controls the frequency synthesizer 12 with the notice of a real operation start from the data processing section 21 to receive the discontinuous wave common signal and controls the changeover devices 18,20 to give the reception frequency control signal 101 latched in the latch device 19 to a reception frequency converter 3, in which frequency control is executed to acquire the discontinuous wave common signal.

2. 发明专利

JPH03101526A SATELLITE CHANNEL MONITORING SYSTEM 失效
公开(公告)号：JPH03101526A
公开(公告)日：1991-04-26
申请号：JP23865289
申请日：1989-09-14
申请人： NEC CORP
发明人： GOTO YUJI
IPC分类号： H04B7/15
摘要： PURPOSE:To monitor the channel state of a satellite channel even in an earth station not having a function making effective isotropic radiation power being the output of a satellite constant by providing a logic means estimating the channel state of an up-link of an opposite earth station based on the transmission output level of a communication opposite station and present station to a satellite communication earth station. CONSTITUTION:A logical device 17 provided on a satellite communication earth station 2 controls a modulator 18 so as to send a same signal 101 as a reception signal 102 sent from a satellite communication earth station 3 based on the condition such as the transmission of error information from an error detector 16, and the signal is outputted from an antenna 11 through an intermediate frequency amplifier 19, a transmission frequency modulator 20 and a transmission power amplifier 21 and received by its own station while being looped back by a reception level detector 15. The logical device 17 recognizes the down-link of its own station from the attenuation of the reception level with respect to the output level in its own station and the attenuation of the up-link of the opposite station is estimated from the attenuation of the reception signal level of the reception signal 102 from the opposite satellite earth station 3 and the attenuation of the down-link of its own station.

3. 发明专利

JPS63268250A RELEASING METHOD OF EPOXY COATING 失效
公开(公告)号：JPS63268250A
公开(公告)日：1988-11-04
申请号：JP10241987
申请日：1987-04-24
申请人： NEC CORP
发明人： GOTO YUJI
IPC分类号： H01L21/56
摘要： PURPOSE:To clear the analysis of junction points, by a method wherein fuming nitric acid containing a specified amount of concentrated sulfuric acid is used as a releasing liquid to retard the dissolution of copper, and epoxy coating is released before copper is dissolved. CONSTITUTION:At the time of the internal analysis of a transistor, an epoxy coating is firstly released by applying fuming nitric acid. Instead of a releasing liquid of fuming nitric acid itself, a releasing liquid of fuming nitric acid mixed with concentrated sulfuric acid (98%) is used. The transistor is immersed in the releasing liquid and heated at 40-65 deg.C, the release reaction is enhanced. When the content of sulfuric acid is less than or equal to 5%, the effect to suppress the dissolution of copper is little, and when the content exceeds 20%, the damage of Al wiring of a pellet increases. The dissolution of copper is retarded, and release is enabled, without damaging junction points with parts so that the analysis is facilitated.

4. 发明专利

JPS62188436A SWITCHING SYSTEM FOR SATELLITE COMMUNICATION EARTH STATION 失效
公开(公告)号：JPS62188436A
公开(公告)日：1987-08-18
申请号：JP2942486
申请日：1986-02-13
申请人： NEC CORP
发明人： GOTO YUJI
IPC分类号： H04B7/15
摘要： PURPOSE:To minimize the satellite power based on a supervisory signal by providing a transmission power control means receiving the output of a switching means and the output of the 1st detection means so as to control the transmission power of a transmission means. CONSTITUTION:Since a holding device 32 in a specific earth station A is in the passing state in the normal operation, a comparator 33 compares both outputs of detectors 30, 31, resulting that an output is sent to a transmission power controller 34, which applies the gain control of an intermediate amplifier 23. Since the transmission power control is a feedback control, an error based on gain fluctuation or the like caused in the transmission system is compensated by a sufficient control accuracy and the control making an effective isotropic radiation power constant in a satellite is ensured. On the other hand, a specific earth station B is operated in the estimation mode for almost periods and in the calibration mode at a proper time interval required to maintain the control accuracy. Thus, the consumption of satellite power based on the transmission of a supervisory signal is minimized.

5. 发明专利

JPH11205315A MULTIPLE-ADDRESS COMMUNICATION METHOD USING SATELLITE CHANNEL AND MULTIPLE-ADDRESS COMMUNICATION SYSTEM 失效
公开(公告)号：JPH11205315A
公开(公告)日：1999-07-30
申请号：JP2033698
申请日：1998-01-14
申请人： NEC CORP
发明人： GOTO YUJI
IPC分类号： G06F13/00 , H04B7/15 , H04L12/18 , H04L12/28 , H04L12/54 , H04L12/58 , H04N7/173 , H04N21/262 , H04N21/61
摘要： PROBLEM TO BE SOLVED: To provide the communication system where a reception station can surely recognize as to what files are sent by multiple-address communication and a satellite channel is effectively utilized. SOLUTION: A Web server 21 of a transmission station 20 sends a file list denoting files which are to be sent by multiple-address communication to a reception state via a general public telephone network 60 (or satellite channel) before a file is sent to a plurality of reception stations 31, 32,..., 3n by multiple- address communication via a satellite 10. The transmission station 20 confirms that the corresponding reception state receives the file list, and then it sends the file by multiple-address communication via a satellite channel. Each of the reception stations 31, 32,..., 3n compares the received file with the file list to surely recognize whether or not the reception of the file is finished. When the reception is not finished, each reception station makes a request to the transmission state 20 for re-transmission of the file via the general public telephone network 60.

6. 发明专利

JPH07283770A SATELLITE COMMUNICATION SYSTEM 失效
公开(公告)号：JPH07283770A
公开(公告)日：1995-10-27
申请号：JP9922394
申请日：1994-04-12
申请人： NEC CORP
发明人： GOTO YUJI
IPC分类号： H04B7/155 , H04B7/15 , H04B7/212
摘要： PURPOSE:To provide a satellite communication system which can perform the satellite communication of a request assignment multiple access system among plural satellite communication earth stations included in an area opposite to the area including a control station or between the satellite communication earth station and the control station which are included in the same area even with use of a multispot beam. CONSTITUTION:A control station 10 transmits the frequency setting signals to the satellite communication earth stations 202 and 203 included in an area Y by a common control signal for setting the communication frequency. At the same time, the station 10 sets the frequency of the transmision/reception parts 16 and 17 to receive the communication signals from the satellite communication earth stations and to return these signals. A repeater 30 owns a function to receive and return the common signal and also the communication signals. Each of stations 202 and 203 has a delay unit which sets the time to receive the common signal and then to transmit an answer signal based on reception delay data.

7. 发明专利

JPH04172828A SATELLITE COMMUNICATION EARTH STATION 失效
公开(公告)号：JPH04172828A
公开(公告)日：1992-06-19
申请号：JP30159590
申请日：1990-11-07
申请人： NEC CORP
发明人： GOTO YUJI
IPC分类号： H04B7/15
摘要： PURPOSE:To reduce the catching time of satellite communication signals so as to effectively utilize a satellite line by receiving the communication signals after correcting the frequency deviation caused by a satellite on the transmission line of the communication signals before starting the communication. CONSTITUTION:A common signal demodulator 5 always receives a common signal from a control station and performs frequency control including the frequency deviation caused by a satellite. The frequency deviation information is contained in a VCO 55 and a frequency detecting section 56 detects the frequency deviation information 104 and sends the information 104 to a communication signal demodulator 13. At the demodulator 13, a frequency control section 58 superimposes the information 104 upon the output of a received signal demodulator 54 and uses the output with the superimposed information as the control voltage of the VCO 55. Accordingly, the receiving frequency control circuit section of the demodulator 13 corrects the frequency deviation by the satellite on the basis of the information 104. Therefore, the communication signal catching time is reduced, since only the frequency deviation of a satellite communication earth station must be taken into account at the time of receiving the communication signals.

8. 发明专利

JPH0457524A TRANSMISSION POWER CONTROL SYSTEM FOR SATELLITE COMMUNICATION EARTH STATION 失效
公开(公告)号：JPH0457524A
公开(公告)日：1992-02-25
申请号：JP16911590
申请日：1990-06-27
申请人： NEC CORP
发明人： GOTO YUJI , NAKANO MOTOO
IPC分类号： H04B7/005 , H04B7/155
摘要： PURPOSE:To control transmission power sent to all transponders with a simple circuit constantly and uniformly by controlling a control means for each transmission means with a control signal. CONSTITUTION:Transmission level controllers 5a, 5b are used as level adjusting devices for a transmission output and the transmission power control signals 101 of the same level control respectively the transmission level controllers 5a, 5b by the same value. Thus, a difference between pilot levels of 1st and 2nd transponders is equal to a level difference of the transmission means provided dividedly to the 1st and 2nd transponder systems 14a, 14b. The level difference is corrected at attenuators 6a, 6b by using level correction signals 201, 202 different from each other in response to a pilot level received by the transponder system outputted from a logic section 17. Thus, the transmission power control due to rainfall attenuation or the like is implemented to each transponder and the operation and maintenance of a satellite line are facilitated.

9. 发明专利

JPH02177728A CHANGEOVER SYSTEM FOR ACTIVE AND STANDBY EQUIPMENT 失效
公开(公告)号：JPH02177728A
公开(公告)日：1990-07-10
申请号：JP32940888
申请日：1988-12-28
申请人： NEC CORP
发明人： GOTO YUJI
IPC分类号： H04L1/22 , H04B1/74
摘要： PURPOSE:To shorten the changeover time and to shorten the detection time of a fault of a standby equipment by setting the standby equipment to the same state of an active equipment taking the longest time for the signal processing normally and bringing the setting state of the standby equipment to the same state of the other active equipment periodically. CONSTITUTION:When the time of the signal processing for an input signal 111 is longer than the time of the signal processing for an input signal 112, and when both communication equipments 2-1, 2-2 are both normal, a changeover control section 14 controls an input signal changeover section 12 so that an input signal to a standby communication equipment 2-3 is made the same as the input signal 111 to the communication equipment 2-1. Moreover, a signal control section 14 controls the information speed processed by an information speed variable type signal processing section 22 of the communication equipment 2-3 so as to be made equal to that of the communication equipment 2-1. When a fault takes place in the active communication equipment 2-1, the changeover of the active and standby equipment is implemented immediately. The time required for the changeover is almost the changeover time of an input signal changeover section and an output signal changeover section.

10. 发明专利

JPS63167531A SWITCHING SYSTEM FOR SATELLITE COMMUNICATION SPECIFIC EARTH STATION 失效
公开(公告)号：JPS63167531A
公开(公告)日：1988-07-11
申请号：JP31332386
申请日：1986-12-29
申请人： NEC CORP
发明人： GOTO YUJI
IPC分类号： H04B7/15
摘要： PURPOSE:To attain smooth switching without causing transient response by sending a prescribed control data from a storage means being an active system to a power control means immediately when a changeover control means is operated and a power supply relating to the active system is turned on. CONSTITUTION:Suppose that, e.g., a system (a) is switched into the active system, a selection register 201a receiving a switching command to the active system sends immediately a prescribed control data to its own adder 202a. The control data is generated by the system (b) and referred to as a system (b) control data. On the other hand, the system (a) control data based on the output of a detector 17a and the output of a latch 19a is inputted to an adder 202a. A desired control data taking an error on the characteristic of the system (a) into account to the system (b) data is formed to an adder 202a and it is fed to a transmission power controller 21a. The switching is similar even when the system (b) is switched and transmission controllers 21a, 21b apply gain control of an intermediate frequency amplifier based on the control data having nearly equal contents. Thus, the transmission power control is switched smoothly without causing a large transient response.

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