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71. 发明专利

JPH0552944A HOLOGRAPHIC RADAR 失效
公开(公告)号：JPH0552944A
公开(公告)日：1993-03-02
申请号：JP16812291
申请日：1991-07-09
申请人： MITSUBISHI ELECTRIC CORP
发明人： SHIMA AKIHIRO , NOMOTO KOHEI , FUJISAKA TAKAHIKO , OHASHI YOSHIMASA
IPC分类号： G01S7/02 , G01S13/42
摘要： PURPOSE:To obtain a holographic radar which allows a multi-beam angle- measuring means to be constituted easily, the arrival angle of a desired reflection wave to be constantly measured uniquely, has small variation of the angle- measuring value due to noise, and a high angle-measuring accuracy of arrival angle of the desired reflection wave. CONSTITUTION:The holographic rader is provided with a multi-beam angle- measuring means 6A which uses an angle which is calculated by specified two beams out of three adjacent beams as the arrival angle of a desired reflection wave according to a size of a value which is obtained by dividing a difference output of two beams out of three combinations of three adjacent beams of a multiple beam which is formed by a digital multi-beam forming means 5. Also, a pattern matching with an antenna pattern is performed by using the least squares method for N-multibeam outputs which are formed by the digital multibeam forming means 5 and a multi-beam angle-measuring means for estimating and calculating the arrival angle of a desired reflection wave is provided.

72. 发明专利

JPH0534444A RADAR 失效
公开(公告)号：JPH0534444A
公开(公告)日：1993-02-09
申请号：JP19306291
申请日：1991-08-01
申请人： MITSUBISHI ELECTRIC CORP
发明人： SEKIGUCHI TAKASHI , KIRIMOTO TETSUO , OHASHI YOSHIMASA
IPC分类号： G01S13/28 , G01S13/52
摘要： PURPOSE:To provide a radar which receives modulated signals including reflected echo from a target and clutters, restrains the clutters so as to demodulate target signals, and thereby detects the target. CONSTITUTION:Pulse signals are 3 modulated at every pulse on a code series generated by a code generator 2 and are radiated into the space from an antenna 8 after conversion 4 to RF. The signals received V undergo phase detection 12 after conversion 4 to RF and amplification 11 and are 13 converted to digital signals. Target signals involved in the digital signals are demodulated, and clutters, which are unnecessary signal components, are 14 restrained so as to 15 detect a target without being obstructed by the clutters. The load coefficient of a non-matching digital filter used to demodulate the target signals and to restrain the clutters is found by a non-matching digital filter load coefficient deciding device 51 using the code series generated by the code generator 2 and the outputs of a clutter Doppler frequency/reception time estimater 16.

73. 发明专利

JPH04301584A PULSE DOPPLER RADAR EQUIPMENT 失效
公开(公告)号：JPH04301584A
公开(公告)日：1992-10-26
申请号：JP6648591
申请日：1991-03-29
申请人： MITSUBISHI ELECTRIC CORP
发明人： INATSUNE SHIGEO , FUJISAKA TAKAHIKO , OHASHI YOSHIMASA
IPC分类号： G01S13/53 , G01S7/292
摘要： PURPOSE:To obtain a pulse Doppler radar equipment enabling attainment of an effect of improvement in a signal-to-noise power ratio(SNR) by coherent integration even when a target being observed is in accelerated movement in the radial direction. CONSTITUTION:A reception signal from a target of observation is converted into a digital complex video signal and stored for each range bin number and pulse hit number in a two-dimensional memory 14. Data trains obtained by dividing data of the two-dimensional memory are subjected to fast Fourier transform in the direction of pulse hit by FFTs 22 respectively. An output signal of each FFT having a phase gradient which is most approximate to the phase gradient of a partial straight line obtained by linear approximation in each partial section of a phase curve of the reception signal from the target of observation being in the accelerated movement supposed beforehand is selected from separate output signals of the FFTs, while such phase compensation as enabling connection of partial straight lines having different phase gradients at a joint of the partial sections is called out of a reference memory, and each of them is subjected to computation of the product and the sum so as to execute coherent integration.

74. 发明专利

JPH03276903A ADAPTIVE ANTENNA 失效
公开(公告)号：JPH03276903A
公开(公告)日：1991-12-09
申请号：JP25387490
申请日：1990-09-21
申请人： MITSUBISHI ELECTRIC CORP
发明人： HARASAWA YASUHIRO , KIRIMOTO TETSUO , OHASHI YOSHIMASA
IPC分类号： H01Q3/26 , G01S7/02 , G01S7/36
摘要： PURPOSE:To eliminate plural spurious waves and to obtain only a desired wave by converting a reception signal into signals orthogonal to each other by a lattice network and using the converted signals so as to calculate a load value. CONSTITUTION:Suppose that a desired wave and a spurious wave come to the antenna at different frequencies, then reception signals x1(n)-xN(n) via N-set of antenna elements 7 and a receiver 6 are inputted to a lattice network 5, in which the signals are orthogonal-converted. An output of the network is inputted to a complex number multiplier 1, a load calculation means 4, and a load number decision means 8. The means 4 receives an output signal of the network 5 and a reference signal generated by a reference signal generator 3 to obtain a load. Moreover, the means 8 receives an output signal of the network 5 to decide the load value. A load value control means 9 receives outputs of the means 8, 4 to select the load value. The multiplier 1 multiplies the load value obtained from the means 4 with the output of the network 5. Outputs of the multipliers 1 are added by a complex number adder 2, in which total sum is obtained.

75. 发明专利

JPH03105276A RADAR APPARATUS 失效
公开(公告)号：JPH03105276A
公开(公告)日：1991-05-02
申请号：JP24406889
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 , G01S13/66
摘要： PURPOSE:To enable observation of a short-distance target by a method wherein transmission timings of pulses corresponding to the number of targets are dispersed in a pulse repetition period and controlled discontinuously. CONSTITUTION:Timing signals for transmission prepared by interleaving pulses indifferent directions (thetaA, thetaB, thetaC, thetaD) corresponding to the number of targets are generated within a transmission pulse repetition period T0 by a transmission timing generating circuit 8. While controlling a transmitter 5, these timing signals control simultaneously data transfer between a beam steering computer 6 for setting a direction of transmission of each transmission pulse and a phase shifter group 4. In other words, the transmission timing generating circuit 8 utilizes one transmitter 5 in a time sharing manner, operating it at timings shown in the figure. Intervals of DELTAT1, DELTAT2, DELTAT3, DELTAT4 are set between the trans mission pulses for the targets according to this constitution, and therefore obser vation of a short-distance target is enabled.

76. 发明专利

JPH0373024A FUZZY BACKWARD INFERENCE DEVICE 失效
公开(公告)号：JPH0373024A
公开(公告)日：1991-03-28
申请号：JP13496690
申请日：1990-05-24
申请人： MITSUBISHI ELECTRIC CORP
发明人： NOMOTO KOHEI , KIRIMOTO TETSUO , OHASHI YOSHIMASA
IPC分类号： G05B13/02 , G06F9/44 , G06N7/02
摘要： PURPOSE:To successively enable fuzzy backward inference by reading out successive set causality corresponding to a successive observation feature amount inputted from an external part at the arbitrary time of observation, further, feeding back a preceding successive inference cause and outputting a this time successive inference cause to be judged from the successive observation feature amount. CONSTITUTION:A successive infering means 1 leads out the fuzzy vector of successive set causality 20 to read out the fuzzy vector element of a successive observation feature amount 10, which is inputted from the external part at the arbitrary time of observation, and causality to be set as knowledge in advance from a causality storing means 2 corresponding to the successive observation feature amount 10. Further, the fuzzy backward inference is executed from the fuzzy vector of a preceding succes sive inference cause 40, which successively feeds back the preceding inference cause from an infered result feedback means 3, and the fuzzy vector of a this time successive inference cause 30, which is inputted up to this time, judged from the successive obser vation feature amount 10 and successively outputted to the external part, is led out. Thus, the inference can be updated for all the feature amounts each time the feature amount can be obtained in the arbitrary order.

77. 发明专利

JPH0315786A RECEPTION SIGNAL PROCESSING DEVICE 失效
公开(公告)号：JPH0315786A
公开(公告)日：1991-01-24
申请号：JP15025889
申请日：1989-06-13
申请人： MITSUBISHI ELECTRIC CORP
发明人： INATSUNE SHIGEO , FUJISAKA TAKAHIKO , OHASHI YOSHIMASA
IPC分类号： G01S7/02
摘要： PURPOSE:To simultaneously receive plural signals simultaneously coming from around by processing the signal of the processing output of each of cylindrically arranged receiving elements (element antennas) by a Fourier transforming means and a convolutional integrating means. CONSTITUTION:Plural receiving elements 1 are arranged in the axial direction and the circumferential direction of a cylinder. A receiver 10 provided for each of receiving elements 1 in a reception means 20 processes the output signal to output a complex signal including amplitude information and phase information. This complex signal is subjected to Fourier transformation in the axial direction by a Fourier transforming means 13, and this Fourier transformed output is subjected to convolutional integration in the circumferential direction by a convolutional integrating means 19 together with reference data which is preliminarily set in the circumferential direction and is stored in a reference data memory 15. Thus, plural beams are simultaneously formed around, and plural signals different in direction are simultaneously received.

78. 发明专利

JPH0311826A ANALOG/DIGITAL CONVERTER 失效
公开(公告)号：JPH0311826A
公开(公告)日：1991-01-21
申请号：JP14646789
申请日：1989-06-08
申请人： MITSUBISHI ELECTRIC CORP
发明人： HARASAWA YASUHIRO , KIRIMOTO TETSUO , OHASHI YOSHIMASA
IPC分类号： H03M1/18
摘要： PURPOSE:To attain sampling and quantization with less bit number even to an analog signal having a large dynamic range by extracting an amplitude of the analog signal and applying sampling and quantization after a prescribed compression. CONSTITUTION:An amplitude phase separator 1 includes an amplitude extraction means 1a and a phase extraction means 1b. A square detector 101 of the means 1a takes a square of an input analog signal Xt to obtain an amplitude (r) by applying route calculation through an LPF 102. On the other hand, an FM detector 103 of the means 1b detects an instantaneous frequency deviation of the signal Xt, an integration device 104 integrates the output with respect to time to obtain a phase theta. The amplitude (r) is compressed logarithmically through a log amplifier 2, sampled and quantized at a sampling device 3a and a quantizer 4a and the result is outputted as a digital signal 6. On the other hand, the phase theta is A/D-converted directly at a sampling device 3b and a quantizer 4b and outputted as a digital signal 7.

79. 发明专利

JPH02208588A INVERSE SYNTHETIC APERTURE RADAR 失效
公开(公告)号：JPH02208588A
公开(公告)日：1990-08-20
申请号：JP3021189
申请日：1989-02-09
申请人： MITSUBISHI ELECTRIC CORP
发明人： FUJISAKA TAKAHIKO , OHASHI YOSHIMASA
IPC分类号： G01S7/02 , G01S13/90
摘要： PURPOSE:To make it possible to observe many targets at the same time without decreasing resolution by using a digital beam forming antenna (DBFA), receiving the echoes from a plurality of targets at the same time, and performing processing at the same time. CONSTITUTION:The echo signals which are received 14 through a plurality of antenna elements 13 are converted A/D 15 and undergo digital processing in digital processing parts 16. A plurality of receiving beams which are directed into the difference directions at the same time can be formed in a digital beam forming antenna DBFA 30. The DBFA 30 is used as a receiving means. A signal processing means 20 is provided for every output of the DBFA 30. The directions and the timings of the transmitting and receiving beams of a transmitting means 40 and the DBFA 30 are controlled with a transmitting/receiving beam controller 18. On the transmitting side, the transmitting beams are transmitted within a pulse repetition period corresponding to the required observing time toward a plurality of targets. The required observing time is set so as to obtain a desired cross range resolution for the transmitted beam. The transmission is performed in the multiplex mode in time. In the receiving side, the received beams corresponding to the desired number of the targets are formed in the DBFA 30. The echo signals from a plurality of the targets are received at the same time and processed in the processor 20. The number of the targets corresponding to the number of the beams can be observed within the same time as one target.

80. 发明专利

JPH01233864A ADAPTIVE ANTENNA 失效
公开(公告)号：JPH01233864A
公开(公告)日：1989-09-19
申请号：JP6141888
申请日：1988-03-14
申请人： MITSUBISHI ELECTRIC CORP
发明人： KIRIMOTO TETSUO , OHASHI YOSHIMASA , WAKAYAMA SHIGEO
IPC分类号： H01Q3/26 , H04L27/14 , H04L27/148
摘要： PURPOSE:To obtain only a desired wave by providing an output decision means selecting an undesired wave elimination means without eliminating a desired wave by an error signal outputted by plural undesired wave elimination means but outputting an output signal with undesired wave eliminated thereof. CONSTITUTION:An undesired wave elimination means 9 is provided, which has a reference signal with strong correlation with a frequency signal without fail even if the frequency of the desired wave is shifted by Frequency Shift Keying(FSK) radio modulation. Moreover, an output decision means 10 is provided, which selects the undesired wave eliminating means 9 having a reference signal with strong correlativity with the desired wave among plural undesired wave eliminating means 9. Thus, even when the frequency of the desired wave is shifted by an FSK radio modulation signal, the output signal from which the undesired wave eliminated thereof is obtained without eliminating the desired wave.

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