-
公开(公告)号：JPS61202512A
公开(公告)日：1986-09-08
申请号：JP4306585
申请日：1985-03-05
Applicant: NEC CORP
Inventor： HASEGAWA MASANOBU
Abstract: PURPOSE:To prevent defective transmission tube or generation of in-tube arcing by using a control signal so as to pass a trigger signal when a level discriminating means discriminates a prescribed value or over of a peak value of an RF input signal and stopping the trigger signal when the peak value is a prescribed value or below. CONSTITUTION:When the discriminating means circuit 11 detects that an RF input signal fed to a CFA is a prescribed level or over, a gate circuit 12 is conductive to pass through an external trigger signal, a switching element 5 is driven to generate a required modulation pulse, which is fed to the CFA, causing normal amplification. On the other hand, when an RF level discriminating circuit 11 detects that the level of the RF input signal is lowered, the circuit 11 gives a signal to the gate circuit 12 to stop the external trigger signal and a switching element 5 of a line type modulator receives no trigger. Since the line type modulator generates no modulation pulse when no drive trigger is fed to the switching element, the in-tube arcing of the CFA is not incurred.
-
公开(公告)号：JPS6120416A
公开(公告)日：1986-01-29
申请号：JP14178484
申请日：1984-07-09
Applicant: Nec Corp
Inventor： HASEGAWA MASANOBU
CPC classification number: H03K3/55
Abstract: PURPOSE:To make a transmitting output of every pulse transmission constant by changing a connected state of a current adjusting means of a load transmitting pipe by a switching means, at every transmitting pulse. CONSTITUTION:Switching elements 6-8 are turned on by applying a driving signal from a driving device 12, in synchronization with a transmitting trigger signal, one of them is selected, and synchronizes with a switching element 4. Variable resistors 9-11 are adjusted so that the peak value of the corresponding pulse current becomes constant. When #1, 2 and 3 pulses in the figure are generated, an on-operation is executed in order of the elements 6, 7 and 8, together with the element 4. A charging voltage of a capacitor 2 generates a voltage drop corresponding to a value of the peak current of a current flowing to a load transmitting pipe 3, and if it is not recovered to the original voltage before the next pulse current is made to flow, and the next transmitting trigger is inputted when it is lower than the original voltage by DELTAE, the current flowing to the load transmitting pipe 3 decreases in accordance with DELTAE and a resistance of a discharging circuit. Accordingly, a current variation portion between transmitting pulses can be decreased by adjusting most suitably a resistance value of the variable resistors 9-11 in accordance with the voltage variation portion DELTAE.
Abstract translation: 目的：通过在每个发送脉冲中改变负载传输管的电流调节装置的连接状态，通过切换装置使每个脉冲传输的发送输出恒定。 构成：与发送触发信号同步地施加来自驱动装置12的驱动信号，开关元件6-8被接通，其中一个被选择，并与开关元件4同步。可变电阻器9-11被调整 使得相应的脉冲电流的峰值变得恒定。 当产生图1中的＃1,2和3个脉冲时，与元件4一起按元件6,7和8的顺序执行接通操作。电容器2的充电电压产生对应于 流过负载传输管3的电流的峰值电流的值，以及在下一个脉冲电流流动之前没有恢复到原始电压，并且当下一个发送触发低于 通过DELTAE的原始电压，流向负载传输管3的电流根据DELTAE和放电电路的电阻而减小。 因此，可以通过根据电压变化部分DELTAE最适当调节可变电阻器9-11的电阻值来减小发射脉冲之间的电流变化部分。
-
公开(公告)号：JPS60194612A
公开(公告)日：1985-10-03
申请号：JP5043084
申请日：1984-03-16
Applicant: Nec Corp
Inventor： HAYASHI TAKAAKI , HASEGAWA MASANOBU
IPC: H03K3/53
CPC classification number: H03K3/53
Abstract: PURPOSE:To prevent an increase in the pulse width of modulation pulses, turns off the switching element at every hit, and to prevent a Fire-through phenomenon by connecting a switching element and a resistance to the load side of a line type modulator in parallel, and turning on this switching element unless the charging voltage of a pulse shaping circuit attains to a normal level. CONSTITUTION:A comparator 9 compares a reference voltage VREF with a divided voltage VPEN' and supplies a trigger signal synchronizing with the driving trigger of a switching element 4 to a switching element 11 unless the voltage attains to a normal voltage. At this time, the switching element 11 turns on and then the energy charged in the pulse shaping circuit (PEN) 5 is discharged while shunt to the primary winding side of a pulse transformer 6 and the series circuit side of the switching element 11 and a resistance 10.
Abstract translation: 目的：为了防止调制脉冲的脉冲宽度的增加，在每次击打时都关闭开关元件，并且通过将并联的开关元件和线型调制器的负载侧的电阻并联来防止火焰现象 ，并且打开该开关元件，除非脉冲整形电路的充电电压达到正常水平。 构成：比较器9将参考电压VREF与分压VPEN'进行比较，并将与开关元件4的驱动触发同步的触发信号提供给开关元件11，除非电压达到正常电压。 此时，开关元件11导通，然后在脉冲变压器6的初级绕组侧和开关元件11的串联电路侧分流时，脉冲整形电路（PEN）5中充入的能量被放电 电阻10。
-
公开(公告)号：JPH07280928A
公开(公告)日：1995-10-27
申请号：JP10058694
申请日：1994-04-14
Applicant: NEC CORP
Inventor： HASEGAWA MASANOBU
Abstract: PURPOSE:To obtain a three-dimensional radar apparatus in which height- measured data on a specific target can be acquired with high accuracy. CONSTITUTION:A specific-target-data generator 11 generates three-dimensional information and a control signal on a target which is specified by an indication device 9a, and the specified target is irradiated with a beam by means of a beam controller 15a. At this time, a transmission-signal controller 12 is controlled, the frequency of transmission radio waves is changed, the beam controller 15a increases the beam irradiation time, the number of hits is changed, and a polarized-wave controller 18 controls a polarized-wave changeover device 49 so as to change the transmission radio waves and polarized waves independently or in a combined manner. As a result, the influence of a multipath or a lobing operation can be reduced, the influence of a signal change portion due to an increase in the number of hits can be reduced, and an optimum reception state can be formed by changing the polarized waves. As a result, the accuracy of an angle measurement is enhanced, and the accuracy of information on altitude can be increased.
-
公开(公告)号：JPH05107339A
公开(公告)日：1993-04-27
申请号：JP26643891
申请日：1991-10-15
Applicant: NEC CORP
Inventor： HASEGAWA MASANOBU
Abstract: PURPOSE:To provide higher ability of identifying a radar pulse signal by extracting the features of signal frequency components. CONSTITUTION:After a radar pulse signal received by a radar is synchronously converted into an intermediate frequency band, it is developed into a frequency spectrum through a filter bank 17 which has required frequency resolution and frequency band and the features of the frequency spectrum are analyzed by a spurious analyzing circuit 18. Data for the features of the frequency spectrum are compared and collated with reference data previously input to a database by a spectrum comparison circuit 19, so that the radar pulse signal can be identified, in spite that it could not be identified only by analyzing wave items such as a frequency, a pulse width and a pulse repetition frequency.
-
Patent Agency Ranking
公开(公告)号：JPH04204186A
公开(公告)日：1992-07-24
申请号：JP33477390
申请日：1990-11-30
Applicant: NEC CORP
Inventor： HASEGAWA MASANOBU
Abstract: PURPOSE:To enable the displaying of a true target alone preventing the display of a false target by a method wherein a specified signal removing section is provided between a signal processing section and an indicator and a target with a receiving time the earliest alone is left to remove the target with a uniform delay among those which always delay in reception. CONSTITUTION:A radar pulse signal arriving from two bearings of azimuths and is received an antenna 1 and the signal is separated with a signal processing section 3 via a receiving section 2 to be inputted into a specified signal removing section 4. Then, the removing section 4 examines a receiving time in details between several hits to be compared with receiving of a plurality of targets. A plurality of targets presenting a fixed difference in receiving time with the same frequency is detected by statistic processing to estimate and determine that the targets are false ones because of effect by reflection and an indication to the effect is transmitted to the processing section 3. As a result, a data of the target assigned is discarded and remaining target data are outputted to an indicator 5 through the removing section 4. In other words, the data with a fixed delay always noted in the receiving time is discarded and the data with the receiving time the earliest alone is outputted to the indicator 5.
-
公开(公告)号：JPH049783A
公开(公告)日：1992-01-14
申请号：JP11299090
申请日：1990-04-27
Applicant: NEC CORP
Inventor： HASEGAWA MASANOBU , HAYASHIDA MOTOYASU , KAWAMURA SHOICHIRO
IPC: G01S5/06
Abstract: PURPOSE:To enable measuring accuracy to be improved without requiring agreement of clock system of a plurality of systems by allowing only one system to perform measurement and signal processing. CONSTITUTION:A first system receives a radar pulse which is discharged from an antenna 6 of a target system and a response command which is transmitted from a transmission antenna 2 of a second system by a receiving antenna 1. Also, when it receives the command, it transmits reception detection signal by the antenna 2. The second system receives the response command by the antenna 2 and receives a radar pulse which is discharged from the antenna 6 of the target system and reception transmission information which is transmitted from the antenna 2 of the first system using the antenna 1. Also, a designator for measurement 5 is used to detect time difference of transmission and reception of these radar pulses and response commands. Then, a position of a target system is calculated based on each time difference.
-
公开(公告)号：JPH042986A
公开(公告)日：1992-01-07
申请号：JP10491690
申请日：1990-04-20
Applicant: NEC CORP
Inventor： HASEGAWA MASANOBU , ITO SHINICHI
Abstract: PURPOSE:To reduce an effect of lobbing sharply and to improve the precision in calculation of distance by calculating the distance to a target on the basis of the average value of a reception signal power at each prescribed number of hits and a known value of an effective radiant power. CONSTITUTION:A series circuit of an integrating circuit 10 and an average reception power calculating circuit 11 is interposed between a reception peak power measuring circuit 8 and a distance calculating circuit 9, and pulse repetition interval (PRI) data are outputted from a data processing system 6 to the calculating circuit 11. In other words, a reception peak power at each hit obtained by the reception peak power measuring circuit 8 is integrated by the integrating circuit 10. The result of integration is subjected to an average value processing in the following calculating circuit 11 by using the PRI data thereby an effect of lobbing is removed. Consequently, highly-precise calculation of distance can be executed in the distance calculating circuit 9 on the basis of effective radiant power (ERP) data and a average reception power.
-
公开(公告)号：JPH02226081A
公开(公告)日：1990-09-07
申请号：JP4617989
申请日：1989-02-27
Applicant: NEC CORP
Inventor： HASEGAWA MASANOBU
IPC: G01S7/02
Abstract: PURPOSE:To maintain air traffic control and monitor function in all azimuths by a method wherein a short pulse transmission signal generating system and a long pulse transmission signal generating system are stop-controlled independently of each other while both control signals are azimuth-blanking controlled independently of each other. CONSTITUTION:An azimuth blanking control circuit 13 generates azimuth blanking control signals synchronizing with antenna rotation angle signals to output them respectively to signal stop control circuits 12a, 12b while a short pulse transmission signal generating system and a long pulse transmission signal generating system can be independently stop-controlled. In other words with respect to both long and short pulse transmission signals or with respect only to the long pulse transmission signal, azimuth blanking can be applied, thereby being fit to electric wave environments of surrounding areas. This can prevent radar detecting characteristics in a near distance area from being lost, maintaining air traffic control and monitor function in all azimuths.
-
公开(公告)号：JPS62156583A
公开(公告)日：1987-07-11
申请号：JP29693385
申请日：1985-12-27
Applicant: NEC CORP
Inventor： HASEGAWA MASANOBU , HASHIMOTO MUKOU , HORIGUCHI KOICHI , YAMASHITA JUNJI
IPC: G01S7/22
Abstract: PURPOSE:To prevent a long distance target from being missed, even in case of an enlarged display to a short distance radar target, by executing a radar display by providing a means for forming a distance scale in the same display image by a combination of plural distance scales being different from each other. CONSTITUTION:As for a sweep signal, in order that a full range R6 can be displayed, a point which reaches a level E in the range R6 is the same, but in order to bring a proximity target to an enlarged display, the enlarged display is executed up to a range R2 by a prescribed enlargement ratio, and accordingly, a level of the sweep signal becomes E' corresponding to the enlargement ratio in the range R2, and thereafter, it rises from the level E' to E extending from the range R2 to R6. That is to say, the level of the sweep signal in this case becomes a broken line shown by O-E'-E. that which approaches such as a radar target 2 displayed by such a sweep signal is brought to an enlarged display and brought to a monitor control with a high accuracy, and also targets 1, 3 being in a long distance are also prevented from being missed from an image visual field.
-
-
-
-
-
-
-
-
-
Search Results
25
records
(took 0.051 seconds)
