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1. 发明专利

JPH10227846A DIRECTION FINDER 失效
公开(公告)号：JPH10227846A
公开(公告)日：1998-08-25
申请号：JP26299297
申请日：1997-09-29
申请人： MITSUBISHI ELECTRIC CORP
发明人： OHASHI YOSHIMASA
IPC分类号： G01S3/46 , G01S3/74
摘要： PROBLEM TO BE SOLVED: To obtain a direction finder which suppresses the influence of a grating lobe generated due to the arrangement of an antenna by a method wherein the cumulative frequency of the azimuth and the angle of elevation of a virtual-radio-wave source is computed so as to correspond to the rotation of an antenna platform and the azimuth angle and the angle of elevation which are at a prescribed frequency or higher are found. SOLUTION: First, by using an instantaneous visual-field steady rotation driving device 14, an antenna platform 2 is directed to the prescribed azimuth angle and the prescribed angel of elevation of a control device 12. Then, radio waves from D pieces of radio-wave sources are processed by a signal processing device A 13 in a prescribed manner. As a result, a projection-length minimum-value computing device 10 finds D sets of azimuth angles and angles of elevation at which a projection length becomes a minimum value. At this time, by the instruction of the device 12, the device 14 turns the platform 2 by a prescribed angle inside the X-Y plane. Then, a processing operation up to the computing device 10 is repeated again, and its output is fond. The processing operation is repeated a plurality of numbers of times, and an output is input to a cumulative angle detector 15. The detector 15 finds its cumulative frequency, and the set of an azimuth angle and an angle of elevation in the prescribed number of frequencies or higher is output.

2. 发明专利

JPH05173997A DEVICE AND METHOD FOR SIGNAL PROCESSING 失效
公开(公告)号：JPH05173997A
公开(公告)日：1993-07-13
申请号：JP34308991
申请日：1991-12-25
申请人： MITSUBISHI ELECTRIC CORP
发明人： OKADA TAKAMITSU , IWAMOTO MASAFUMI , FUJISAKA TAKAHIKO , OHASHI YOSHIMASA
IPC分类号： G06F15/18 , G06G7/60 , G06N3/00 , G06N99/00
摘要： PURPOSE:To provide the signal processor which has higher performance than usual even when the processor is used in environment wherein the signal-to-noise power ratio varies by providing a learning means, a noise generating means, and a superposing means. CONSTITUTION:This processor is equipped with a learning signal generating means which generates a learning signal 22, a tutor signal generating means which generates a tutor signal 23 teaching what the generated signal 22 is, the noise signal generating means 4 which generates a noise signal, and the superposing means 5 which superposes the generated learning signal 22 and noise signal one over the other to generate a superposition signal. Further, the processor is equipped with a hierarchic neural network 7 as the learning means which inputs the superposition signal and tutor signal 23 for learning and a discrimination result decision means 8 which inputs an discrimination signal 21 to the hierarchic neural network 7 and decides a discrimination result from its output. Consequently, the signal processor which has small deterioration in performance even in environment wherein the signal-to-noise power ratio varies with time and uses the neural network is obtained.

3. 发明专利

JPH0556009A TRANSMITTER-RECEIVER 失效
公开(公告)号：JPH0556009A
公开(公告)日：1993-03-05
申请号：JP21088591
申请日：1991-08-22
申请人： MITSUBISHI ELECTRIC CORP
发明人： OKAMURA ATSUSHI , KIRIMOTO TETSUO , OHASHI YOSHIMASA
IPC分类号： H04B1/40 , H04B15/00
摘要： PURPOSE:To realize the transmitter-receiver in which an observation fault of a desired reception wave signal due to a reception interference wave causing interference from a sender side to a receiver side is excluded with comparatively simple configuration when transmission of a pulse signal and reception of a pulse signal are simultaneously implemented in the transmitter-receiver provided with an interference wave suppression means. CONSTITUTION:A transmitter 1 of a sender side is provided with a pulse transmission signal generating means 11A and a broad band signal generating means 12 generating a broad band signal to add a broad band signal to a transmission signal. An interference wave suppression means 10 at a receiver side is provided with an adaptive filter 7 receiving part of the transmission signal with the broad band signal at the sender side added thereto and simulating a reception interference wave signal causing interference from the sender side to the receiver side, and with a subtractor means 8 subtracting an output signal of the adaptive filter from an output signal of a receiver 2. An observation fault of a desired reception wave signal s(k) due to the reception interference wave causing interference from the sender side to the receiver side is excluded without complicated configuration by expanding the frequency band of the reception interference wave suppressed by the adaptive filter.

4. 发明专利

JPH04117802A SIDE LOBE CANCELLER 失效
公开(公告)号：JPH04117802A
公开(公告)日：1992-04-17
申请号：JP23754190
申请日：1990-09-07
申请人： MITSUBISHI ELECTRIC CORP
发明人： KIRIMOTO TETSUO , HARASAWA YASUHIRO , OHASHI YOSHIMASA
IPC分类号： H01Q3/26 , G01S7/02
摘要： PURPOSE:To ensure interference wave suppressing performance without being affected by an incident direction of plural interference waves by providing a subtraction means outputting a difference signal between a reception signal of a main antenna and an output signal of an adaptive filter and a control means connecting to an output of the subtractor means and controlling a changeover means so as to output N-sets of reception signals to minimize the power of the difference signal to the canceller. CONSTITUTION:An auxiliary antenna 2c as a 3rd auxiliary antenna not arranged in a line from other antennas, a receiver 4c and a switch 10 as a changeover means applying two of reception signals x0, x1, x2 of three auxiliary antennas 2a, 2b, 2c to an input of an adaptive filter 11 are provided to the canceller. Moreover, a controller 13 is provided to an output of a subtractor means 6 and a means selecting combination of N-sets of auxiliary antennas to minimize an output signal power of the side lobe canceller among present combinations of the auxiliary antennas is provided to realize the preset combination of the auxiliary antennas by selecting the switch 10.

5. 发明专利

JPH03276083A RADAR EQUIPMENT 失效
公开(公告)号：JPH03276083A
公开(公告)日：1991-12-06
申请号：JP7788390
申请日：1990-03-27
申请人： MITSUBISHI ELECTRIC CORP
发明人： FUJISAKA TAKAHIKO , OHASHI YOSHIMASA
IPC分类号： G01S7/02 , G01S13/48
摘要： PURPOSE:To simplify a beam formation by providing a receiving beam control means, storage means to specify receive data for the storage by a receiving module number of an antenna and target number, and beam forming means. CONSTITUTION:By the receiving beam control means 700, only the received data in which the target exists are extracted from the received data C1, K-Pn, K, and a numbering work for target number is performed to the received data for each target in accordance with a target bearing and informations of target distance and target quantity. Then by the storage means 600, only the received data in which the target exists are specified for the storage by the receiving module number of digital beam forming antenna 300 and the target number, then received data groups of the same target number stored in the storage means 600 are read out in order of the target number by a control from the receiving beam control means 700, and the beam formation is performed succes sively by the beam forming means 500.

6. 发明专利

JPH03252581A RADAR DEVICE 失效
公开(公告)号：JPH03252581A
公开(公告)日：1991-11-11
申请号：JP5110890
申请日：1990-03-02
申请人： MITSUBISHI ELECTRIC CORP
发明人： SHIMA AKIHIRO , FUJISAKA TAKAHIKO , OHASHI YOSHIMASA
IPC分类号： G01S7/292 , G01S13/532
摘要： PURPOSE:To improve the detection probability below a given miswarning probability by connecting a received signal band measuring means to respective range pins and equipping a coherent integrator with a means which determines the best integral number according to reception band width and an SN ratio. CONSTITUTION:A received signal is distributed to M range pins 2 and inputted to the received signal band width measuring means 8 and after Fourier transformation, the band width of the Doppler spectrum of the received signal which is normalized at a pulse repetitive frequency is found. Further, the coherent integrator 7 which has the determining means for the optimum integral number determines the optimum integral number according to the band width of the Doppler spectrum and the SN ratio of the received signal to perform coherent(CH) integration and its output is amplified and detected 4, and then integrated by a noncoherent integrator 5. At this time, the noncoherent integral number is obtained by dividing the number of pulse hits by the optimum integral number. When the output of the integrator 5 exceeds a threshold value, that is displayed 13 as target detection.

7. 发明专利

JPH03105277A RADAR APPARATUS 失效
公开(公告)号：JPH03105277A
公开(公告)日：1991-05-02
申请号：JP24406989
申请日：1989-09-20
申请人： MITSUBISHI ELECTRIC CORP
发明人： FUJISAKA TAKAHIKO , KIRIMOTO TETSUO , OHASHI YOSHIMASA , KONDO TOMOMASA
IPC分类号： G01S7/02 , G01S13/52
摘要： PURPOSE:To make it easy to cope with a short-distance target by a construction wherein transmission pulses are thinned out in accordance with a Doppler frequency obtained by processing each received beam output by a frequency analyzing means. CONSTITUTION:At the time point when observation is started, each selector switch 14 is connected onto the contact 14a side, a Doppler frequency (speed information in the relationship of fd = 2 v/lambda when the Doppler frequency is denoted by (fd), a radial velocity by (v) and a transmission wavelength by lambda) existing in the direction of each beam is measured by a frequency analysis by a beam forming circuit 3, and the central frequency of each BPF 12 is set on the basis of the result of measurement. By utilizing a subpulse in a time sharing manner for a plurality of targets in accordance with the radial velocities of the targets, in this way, the targets in large numbers can be observed without increasing the number of subpulses, and also observation of a short-distance target is facilitated.

8. 发明专利

JPH02242186A RADAR APPARATUS 失效
公开(公告)号：JPH02242186A
公开(公告)日：1990-09-26
申请号：JP6238989
申请日：1989-03-15
申请人： MITSUBISHI ELECTRIC CORP
发明人： KIRIMOTO TETSUO , HOTTA TAKASHI , OHASHI YOSHIMASA
IPC分类号： G01S13/28 , G01S13/32
摘要： PURPOSE:To detect a small target readily even if large targets and small targets are present in close proximity by using an orthogonal sequence as a sequence used for the code modulation of a transmitting signal, and suppressing the generation of the range side lobes of demodulated signals as much as possible. CONSTITUTION:In an orthogonal sequence generator 11, the component of the output signal generated in an M-sequence generator 24 inputs the M sequence of 0.1 into a substituting means (component substituting device 25). In the substituting means, A0e is made to substitute with A0 as a positive real number when the component in the M sequence is 0, and A1e is made to substitute with A1 as a positive real number. A trigonometric function fi(phi1 - phi2) having a phase of phi1 - phi2 becomes the ratio between two functions f2(A1/A0) and f3(A1/A0) of an amplitude ratio A1/A0, wherein the linear expression of a period N in an M sequence as shown in the expression in the figure is a coefficient. The orthogonal sequence is generated in this way. Thus, the generation of the range side lobes of the demodulated signal is suppressed as much as possible, and a small target can be detected readily.

9. 发明专利

JPH02206782A HOLOGRAPHIC RADAR 失效
公开(公告)号：JPH02206782A
公开(公告)日：1990-08-16
申请号：JP2709089
申请日：1989-02-06
申请人： MITSUBISHI ELECTRIC CORP
发明人： SHIMA AKIHIRO , FUJISAKA TAKAHIKO , OHASHI YOSHIMASA
IPC分类号： G01S7/02 , G01S13/44
摘要： PURPOSE:To improve accuracy by forming multibeams by a digital multibeam forming means and measuring an angle by a multibeam angle measuring means using the adjacent three beams among these beams. CONSTITUTION:The hologram radar is provided with high-speed Fourier transform means for frequency analysis between respective signal receiving machines 3 and the digital multibeam forming means 5 in order to discriminate the received signals by Doppler frequency differences and is provided with the multibeam angle measuring means 10 using the adjacent three beams behind the digital multibeam forming means 5. The multibeams are formed by the digital multibeam forming means 5 and the target angle is measured by using the above-mentioned three beams by the multibeam angle measuring means 10 connected to the digital multibeam forming means. The measurement angle with the higher accuracy than in the case of using the two beams is possible in this way.

10. 发明专利

JPH02162285A DIGITAL BEAM FORMING RADAR 失效
公开(公告)号：JPH02162285A
公开(公告)日：1990-06-21
申请号：JP31777288
申请日：1988-12-16
申请人： MITSUBISHI ELECTRIC CORP
发明人： KIRIMOTO TETSUO , FUJISAKA TAKAHIKO , OHASHI YOSHIMASA
IPC分类号： G01S7/02 , G01S7/36 , G01S13/24 , G01S13/48
摘要： PURPOSE:To enhance jamming-resistant capacity by transmitting a transmitting radio wave while taking the synchronism of operation timing and further together using the changing-over of three kinds of mode patterns for changing a scanning direction and further periodically changing over transmission frequency at every scanning. CONSTITUTION:As a transmission antenna, a phase array antenna 1a is used and, as a receiving antenna, a digital beam forming antenna 7 is used. The antenna 7 consists of antenna elements 1b, 3, a receiver 4 equipped with a filter bag discriminating receiving frequency provided at every antenna element, an A/D converter 5 and an operation means 6 discriminating transmitting radio waves from different directions at every directions. A timing controller 15 together uses three mode patterns, that is, a mode controlling the operations of a beam scanning controller 2a, a frequency synthesizer 2b and the converter 5 to take the synchronism thereof and periodically changing over transmission frequency at every scanning, a mode changing over transmission frequency periodically at every transmitting direction and a mode changing over transmission frequency in each transmitting direction at random at every scanning to perform change-over control.

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