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1. 发明专利

JPS6226431B2 失效
公开(公告)号：JPS6226431B2
公开(公告)日：1987-06-09
申请号：JP13694978
申请日：1978-11-07
申请人： NIPPON ELECTRIC CO
发明人： IBE TAKASHI , HAGISAWA TOSHIHIKO
IPC分类号： G01S13/20 , G01S13/22 , G01S13/52 , G01S13/528

2. 发明专利

JPS60169782A MOVING TARGET DISPLAY APPARATUS 失效
公开(公告)号：JPS60169782A
公开(公告)日：1985-09-03
申请号：JP2551384
申请日：1984-02-14
申请人： NIPPON ELECTRIC CO
发明人： TOGASHI FUSAJI , HAGISAWA TOSHIHIKO
IPC分类号： G01S13/52 , G01S13/524 , G01S13/526 , G01S13/528
摘要： PURPOSE:To enable the detection of an airplane from a region in which both of fixed clutter and moving clutter are present, by detecting a moving target signal by erasing the unnecessary receiving signal (clutter) contained in a radar receiving. CONSTITUTION:When I and Q being orthogonal video signals are inputted to fixed clutter erasing devices 1, 2, they are processed by the erasing devices 1, 2 and fixed clutter is erased while moving clutter is not erased. Next, in order to process this moving clutter signal as a fixed clutter signal, operation is performed in phase/amplification correctors 3, 4 and the correction of the phase and amplification corresponding to the speed thereof. The corrected signals are erased by moving clutter erasers 5, 6 as a result. Next, a phase correction data generator 7 generates a phase change component at every trigger state and said phase change component is converted by a SIN/COS converter 10 through an integrator 9. Output data of an amplitude correction data generator 8 and the converter 10 are multiplied by an amplitude corrector 11 and the correction data of a phase and amplitude can be calculated.

3. 发明专利

JPS60128381A RADAR SIGNAL PROCESSOR 失效
公开(公告)号：JPS60128381A
公开(公告)日：1985-07-09
申请号：JP23674483
申请日：1983-12-15
申请人： NIPPON ELECTRIC CO
发明人： NAKAMURA HIROSHI , HAGISAWA TOSHIHIKO
IPC分类号： G01S13/52 , G01S13/524 , G01S13/53
摘要： PURPOSE:To perform clutter removal and suppression by any region by making a separation by using the difference between Doppler frequency components of a target and clutter, then performing clutter suppression airthmetic. CONSTITUTION:An echo from a searching space is received by an antenna 1 and inputted to a frequency mixer 4 through a duplexer 2, and the signal is converted into an intermediate frequency and also amplfied. Then, the output of the frequency mixer 4 and a reference signal generated by a reference signal generator 5 are inputted to an in-phase component synchronous detector 6 and an orthogonal component detector 7 to extract the Doppler frequency that a reflecting body has. Then, the signal is inputted to the Dopper frequency extractor 9 consisting of plural Doppler fiters 8 and outputted to the Doppler filter corresponding to the Doppler frequency of the input signal. A clutter suppression computting element 11 calcuates a mean value and a square mean value from the absolute value signal of the output of every filter calculated by an absolute value calculating device 10 to perform the clutter suppression arithmetic processing.

4. 发明专利

JPH032433B2 失效
公开(公告)号：JPH032433B2
公开(公告)日：1991-01-16
申请号：JP2551384
申请日：1984-02-14
申请人： NIPPON ELECTRIC CO
发明人： TOGASHI FUSAJI , HAGISAWA TOSHIHIKO
IPC分类号： G01S13/52 , G01S13/524 , G01S13/526 , G01S13/528

5. 发明专利

JPS58129375A CLUTTER SUPPRESSION APPARATUS 失效
公开(公告)号：JPS58129375A
公开(公告)日：1983-08-02
申请号：JP1348182
申请日：1982-01-29
申请人： NIPPON ELECTRIC CO
发明人： SHIMOJIYOU KIYOSHI , HAGISAWA TOSHIHIKO
IPC分类号： G01S7/28 , G01S13/52 , G01S13/522
摘要： PURPOSE:To enable automatic switching of a clutter suppression means by evaluating a clutter area while identifying fixed clutters and moving clutters. CONSTITUTION:A signal having a Doppler frequency zero or close to zero is extracted with a zero Doppler filter 10 and a fixed clutter is detected with a clutter detector A11 from the output signal thereof. A fixed clutter and a moving clutter are detected with a clutter detector B12 from a normal video. A video switch control 9 evaluates an area without clutter, an area of a fixed clutter and an area of a moving clutter on an output signal of a clutter detector A11 and a clutter detector B12 and generates a control signal to operate a video switch 7. Thus, a video is automatically outputted according to various clutters.

6. 发明专利

JPH0310080B2 失效
公开(公告)号：JPH0310080B2
公开(公告)日：1991-02-12
申请号：JP5042384
申请日：1984-03-16
申请人： NIPPON ELECTRIC CO
发明人： IBE TAKASHI , HAGISAWA TOSHIHIKO
IPC分类号： G01S7/36 , G01S3/58 , G01S7/02 , G01S13/46

7. 发明专利

JPS5563773A RADAR UNIT 失效
公开(公告)号：JPS5563773A
公开(公告)日：1980-05-14
申请号：JP13694978
申请日：1978-11-07
申请人： NIPPON ELECTRIC CO
发明人： IBE TAKASHI , HAGISAWA TOSHIHIKO
IPC分类号： G01S13/20 , G01S13/22 , G01S13/52 , G01S13/528
摘要： PURPOSE:To enhance a capability for removing interference signals, by a device wherein both normal video and MTI video are independently provided with circuits generating gate signals to remove pulse-type interference signals from the normal and MTI videos. CONSTITUTION:Interference signals in MTI video generate corresponding gate signals. The output from the gate signal generator 307 enters the video gate circuit 313. Normal video simultaneously entering the video gate circuit 313 is cut off while gate signal is appearing. Thus, the normal video with interference signal being removed exits from the video gate circuit 313. The output from the OR gate 312 enters the video gate circuit 314. MTI video simultaneously entering the video gate circuit 314 is cut off while the gate signal is appearing. Thus, the MTI video, with interference signals being removed, appears from the video gate circuit 314.

8. 发明专利

JPS54119894A ANGLE MEASURING UNIT 失效
公开(公告)号：JPS54119894A
公开(公告)日：1979-09-18
申请号：JP2732378
申请日：1978-03-09
申请人： NIPPON ELECTRIC CO
发明人： IZUMITANI TOSHIYUKI , HAGISAWA TOSHIHIKO
IPC分类号： G01S3/28 , G01S3/30
摘要： PURPOSE:To suppress the signal toward wrong direction and to enable angle measurement with high accuracy, by obtaining the sum voltage other than the difference voltage of reception signal every set, in performing angle measurement for the incoming angle of the signal from broad range by locating a plurality of sets of two antennas. CONSTITUTION:When the sets of antennas having an objective azimuth are taken as 32, 33 to 38, and 39, four sets, the reception output of each antenna is logarithmically amplified and detected with the reception circuits 40 to 47, and the difference voltage of the detection output of two antennas is obtained with the differential amplifying circuits 48 to 51 of each set and converted into angular signal with the operation circuits 56 to 59. In this case, the difference voltage is caused to other antenna sets normally adjacent to one incoming signal, causing wrong directional signal. Then, the addition amplifying circuits 52 to 55 are provided to each set,and the sum voltage is obtained by adding two detection outputs, the magnitude of the sum voltages of each set is compared with the gate control signal production circuit 60, the maximum set is identified, the angular signal for true signal incoming range is selected with the gate circuit 61, and it is displayed on the display circuit 62.

9. 发明专利

JPH0228836B2 失效
公开(公告)号：JPH0228836B2
公开(公告)日：1990-06-26
申请号：JP1542080
申请日：1980-02-13
申请人： NIPPON ELECTRIC CO
发明人： HAGISAWA TOSHIHIKO , SHIMOJO KYOSHI , IRABE TAKESHI
IPC分类号： G01S7/28 , G01S7/292 , G01S13/52 , G01S13/526

10. 发明专利

JPS6024477A RADAR SIGNAL PROCESSING APPARATUS 失效
公开(公告)号：JPS6024477A
公开(公告)日：1985-02-07
申请号：JP13334583
申请日：1983-07-21
申请人： NIPPON ELECTRIC CO
发明人： NAKAMURA HIROSHI , KIUCHI HIDEKAZU , HAGISAWA TOSHIHIKO
IPC分类号： G01S13/52 , G01S7/292 , G01S13/522 , G01S13/524 , H03H17/00 , H03H17/02 , H03H21/00
摘要： PURPOSE:To well perform the detection of an object by enabling the suppression of an unnecessary signal adapted to each region, by respectively changing over filter factor to a fixed clutter region, a moving clutter region and clear region. CONSTITUTION:The titled apparatus is equipped with an input terminal 300 of a complex signal, a generator 340 for imparting weighing coefficient corresponding to a region to a sweep memory 311 and a weighting processing device 321, a sweep memory 312 and a weighting processing device 322..., a terminal 331..., a control signal generator 350 for generating a weighting factor changing-over signal, a region discriminator 360 for discriminating a region from an input signal and an adder 380 for adding the output signals of wighting multipliers 321-32N. In this case, corresponding to a generated region discriminating signal (to a fixed clutter region, a moving clutter region and a clear region), filter factor is changed over so as to obtain optimum filter characteristics to each region.

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