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公开(公告)号：JPH06265631A
公开(公告)日：1994-09-22
申请号：JP5449793
申请日：1993-03-16
Applicant: NEC CORP
Inventor： HASEGAWA MASANOBU
Abstract: PURPOSE:To send and receive information required for linking operation between neighboring linked radars, which are deployed so as to detect and track targets without special communications circuits. CONSTITUTION:A radar-transmission-signal generating part 5a of a radar (1) 101a generates the radar-transission signal. A transmission-data-signal generating part 6a encripts and generates the information and the like with regard to target activity required for the linking operation. Each of two signals is transmitted with a transmitter 3a, a duplexer 3 2a and an antenna 1a. At this time, the transmission data signal is sent out by utilizing the rest time between transmissions. The recived signal from the partner radar is guided into a receiver 7a. The radar transmission signal and the transmission data signal are identified and separated in a signal separating/analyzing part 8a. After the signal processing in a radar-signal processing part 9a, the data are displayed on a radar display part 10a.
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公开(公告)号：JPH03186782A
公开(公告)日：1991-08-14
申请号：JP32594089
申请日：1989-12-18
Applicant: NEC CORP
Inventor： HASEGAWA MASANOBU
IPC: G01S13/22
Abstract: PURPOSE:To completely remove a false image by changing the repetition time of transmitting pulse and detecting the existence of change in relative time difference between the transmitting pulse and receiving signal in accordance with the above repetition time change. CONSTITUTION:A discriminating function is made to be ON to operate a trigger control circuit 5. The transmitting pulse is transmitted to an antenna 3 by a transmitter 1 through a circulator 2. The repetition time of transmitting pulse is changed at this time. A video signal is sent to a target position locating circuit 6 and a false image removing circuit 8 by a receiver 4 when the receiving signal is received. The time interval between the transmitting pulse and receiving signal from the target is measured by the target position locating circuit 6 to send the measured result to a discriminating circuit 7 for real/false image. When the discriminating function is in the ON state, a conclusion is made by the circuit 7 whether the target is real image or not based on the measured result from the circuit 6, then the conclusion result is sent to the circuit 8. Next, when the target is a false image, the receiving signal corresponding to this target is removed, or a tag display indicating that the target is false image is given, in the circuit 8.
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公开(公告)号：JPH01180480A
公开(公告)日：1989-07-18
申请号：JP525488
申请日：1988-01-12
Applicant: NEC CORP
Inventor： HASEGAWA MASANOBU
Abstract: PURPOSE:To improve the reliability and system gain of the radar equipment by constituting a transmitting horn and a transmitting feeder, and a receiving horn and a receiving feeder alternately independently. CONSTITUTION:A transmission output signal is supplied directly to an antenna device 3 through the transmitting feeder 2. In the device 3, the transmission signal reaches the transmitting horn 32 through a rotary joint 31 and formed by a reflecting plate 34 into a prescribed beam, which is radiated in the air. A reflected signal from a target, on the other hand, passes through the reflecting plate 34, receiving horn 33, and joint 31 in order and is led to a limiter 5 through the receiving feeder 4, compressed to a necessary level, and then supplied to a low-noise amplifier 6. Thus the transmission system and reception system are provided independently to eliminate the need for a four-terminal circulator for transmission/reception switching. Further, the limiter 5 needs to be increased in electric power resistance for a transmission/reception switching system, but this separate independent constitution reduces the input level to less than one over several hundreds as compared with the conventional system and the electric power resistance is improved.
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公开(公告)号：JPS6257314A
公开(公告)日：1987-03-13
申请号：JP19673585
申请日：1985-09-05
Applicant: NEC CORP
Inventor： HASEGAWA MASANOBU
Abstract: PURPOSE:To provide an optimum waveform to each pulse even when plural pulses with different pulse width are generated by providing an adder circuit arranging outputs of the 1st and 2nd pulse transformers in time series and using the output of the adder circuit to operate a switching element. CONSTITUTION:A short pulse drive signal SP as the 1st pulse and a long pulse drive signal LP as the 2nd pulse are inputted separately as a drive signal generating a required pulse. The drive circuit 11 and the pulse transformer 12 of the short pulse system and the drive circuit 13 and the pulse transformer 14 of the long pulse system are provided separately to the drive signals SP and LP, the outputs of the pulse transformers 12, 14 are arranged in time series in the adder circuits 15, 15... and inputted to the switching element. Thus, the output pulse is outputted as a steep pulse for leading and trailing for the short pulse and as a pulse having no sag at the flat part for the long pulse respectively.
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公开(公告)号：JPS5765018A
公开(公告)日：1982-04-20
申请号：JP14022380
申请日：1980-10-07
Applicant: Nec Corp
Inventor： MORIGUCHI YUKIO , HASEGAWA MASANOBU
CPC classification number: H03K3/53
Abstract: PURPOSE:To achieve response to voltage fluctuation in high speed with stable operation, by controlling a switching element in on/off switching operation in high speed and keeping a charging voltage to a pulse forming circuit, in a pulse modulator used for radars. CONSTITUTION:An input power is rectified 2, smoothed at a choke coil 3 and a capacitor 4, and converted into direct current. A high frequency charging trigger voltage is controlled at a gate circuit 16, transistor-driven 12, applied to two sets of transistors (TR) 13 via a pulse transformer 18, converted into a high frequency AC current, applied to a high frequency transformer 14, and the output is charged to a pulse forming circuit 9 through a hold-off diode 7. The charging voltage of the circuit 9 is monitored via a potential divider, compared 15, a signal is produced at a specified level, this is applied to the circuit 16, the charging trigger is turned off to stop the charging. Thus, the charging voltage to a pulse forming circuit can be kept constant.
Abstract translation: 目的：为了在稳定运行的高速下实现对电压波动的响应，通过在用于雷达的脉冲调制器中，高速开关控制开关元件和保持脉冲形成电路的充电电压。 构成：输入电源整流2，在扼流线圈3和电容器4处平滑，并转换为直流电。 在通过脉冲变压器18施加到两组晶体管（TR）13的门电路16（晶体管驱动12）上控制高频充电触发电压，转换成高频交流电流，施加到高频变压器14 ，并且通过保持二极管7将输出充电到脉冲形成电路9.通过电位分压器监测电路9的充电电压，与15相比，产生指定电平的信号，这被应用于 电路16，充电触发器被关闭以停止充电。 因此，脉冲形成电路的充电电压可以保持恒定。
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Patent Agency Ranking
公开(公告)号：JPH07128435A
公开(公告)日：1995-05-19
申请号：JP29268493
申请日：1993-10-28
Applicant: NEC CORP
Inventor： URUSHIDO TAKASHI , HASEGAWA MASANOBU
Abstract: PURPOSE:To level the unevenness of covering range in all bearings and to acquire stably a target in the vicinity of a maximum detecting distance, in a radar equipment of an electronic scanning type. CONSTITUTION:The direction of an electromagnetic wave beam is deflected slightly at every (n)th (n=1, 2, 3,...) scanning and thereby the unevenness of a covering range pattern is leveled equivalently. In order to bring about this function, a beam control signal from a beam controller 9 is corrected by an about 1/2 interval at every (n)th scanning by a beam interpolating circuit 8. Since each of phase shifters 2-1 to 2-m is driven on the basis of the data thus obtained, the electromagnetic wave beam synthesized in a space is shifted by the about 1/2 beam interval at (n)th scanning. Thereby, the covering range pattern is leveled and even a target in the vicinity of a maximum detecting distance can be detected stably.
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公开(公告)号：JPS63177090A
公开(公告)日：1988-07-21
申请号：JP1032287
申请日：1987-01-19
Applicant: NEC CORP
Inventor： HASEGAWA MASANOBU
Abstract: PURPOSE:To hold down the occurrence of a false symbol on an indicator and to improve the problem of system down, by providing a means not to deliver the data only of a primary radar when the false number of the primary radar exceeds an allowance. CONSTITUTION:This system is composed of a primary radar 1, a secondary radar 2, a target counting unit 6, a false determination unit 7, a data control unit 8 and a radar processing system 4. The counting unit 6 counts one by one how many target data exceeding a threshold set in a digitizer 13 are present in each area set separately. The determination unit 7 collates the data of the counting unit 6 with that of a correlation processing unit 3 to take only a false out of these data except a true target part, and compares it with a standard state of operation of the radar 1. In the case when the false of an area is more than a value set beforehand, the data control unit 8 removes the data only of the radar 1 in the same area sent from the processing unit 3 and delivers to the system 4 the data only of the radar 2 or the data which are correlated between the primary and secondary radars.
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公开(公告)号：JPS6319578A
公开(公告)日：1988-01-27
申请号：JP16331986
申请日：1986-07-11
Applicant: NEC CORP
Inventor： HASHIMOTO MUKOU , HORIGUCHI KOICHI , YAMASHITA JUNJI , HASEGAWA MASANOBU
IPC: G01S7/22
Abstract: PURPOSE:To attain highly accurate supervisory and to attain also sure supervisory for a far distance object by simultaneously displaying plural videos with different range scales. CONSTITUTION:A SIN/COS generator 11 generates signals corresponding to the deflecting signal components of the X and Y directions of a CRT and shifting respective phases by 90 deg. each other as a SIN wave and a COS wave. The generator 11 generates the SIN and COS data relating to respective angles of a directional angle signal 6 based on a prescribed bearing resolution by using a real north signal 7 obtained from a radar device body as a time reference and supplies SIN and COS wave components 11a, 11b respectively to sweep generators 12, 13. A range switch 19 determines a prescribed expansion range in a prescribed bearing range based on a signal outputted from a bearing/range selector 10. The selector 10 is specified at its sweeping range in a prescribed bearing position and its range based on the signals 6, 7 and a bearing/range setting signal 5 and switches full range sweep and range expansion sweep by controlling the switch 19. Thereby, only a necessary bearing range can be expanded to attain highly accurate supervisory and a far distance object also can be surely supervised.
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公开(公告)号：JPH0997391A
公开(公告)日：1997-04-08
申请号：JP25407095
申请日：1995-09-29
Applicant: NEC CORP
Inventor： NAKAMURA YUKI , HASEGAWA MASANOBU
Abstract: PROBLEM TO BE SOLVED: To improve the reliability of a landslide monitoring system for landslide monitoring by accurately measuring a landslide in a wide-range place and facilitating the installation of a detecting transmitter receiver, eliminating unnecessary transmission and reducing the radio interference and power consumption, and easily starting up the system again after landslide occurrence. SOLUTION: When receiving successive from a center monitor station 30, transmitter 10a to 10j installed in a place where a landslide possibly takes place send their discrimination codes by radio. The sent discrimination codes are received by there treatment stations 20a to 20c at the same time and the arrival directions of the sent waves are measured. The center monitor station 30 specifies the positions of the radio transmitters 10a to 10j, from which the discrimination codes are received, from the intersection of the discrimination codes and reception azimuths from the treatment stations 20a to 20c, and compares them with the positions of the corresponding radio transmitters 10a to 10j which are previously stores and correspond to the discrimination codes to monitor position shifts.
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公开(公告)号：JPS646883A
公开(公告)日：1989-01-11
申请号：JP16342187
申请日：1987-06-30
Applicant: NEC CORP
Inventor： HASHIMOTO YASUHIRO , HASEGAWA MASANOBU , HORIGUCHI KOICHI , YAMASHITA JUNJI
IPC: G01S7/14
Abstract: PURPOSE:To supervise plural control areas by displaying the plural control areas on one CRT screen in combination at the same time so the display azimuth angle enlargement rate, sweep mode, and maximum distance scale are specific. CONSTITUTION:A display system selector 1 consists of an angle enlargement rate computing element 11, a sweep function generator 12, and a maximum range selector 13 and respective signals of the azimuth angle range, angle enlargement rate, sweep system, and maximum range are inputted corresponding to control areas to be displayed, thereby setting them. Sweep signal generators 3 and 4 generate sweep signals according to the indication from the display system selector 1. A video mixer 8 mixes range mark pulses from a range mark pulse generators 7 with a video signal of radar video from a radar device main body and a video amplifier 9 amplifies the output of the mixer 8 and supplies the result to a CRT as a bias signal.
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