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公开(公告)号：AU599293B2
公开(公告)日：1990-07-12
申请号：AU1677888
申请日：1988-05-30
Applicant: NEC CORP
Inventor： YAMANE TOSHINOBU , KURAMOTO AKIO , SHIMIZU RYUJI , NAKAYAMA MAKOTO
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公开(公告)号：DE3789162D1
公开(公告)日：1994-04-07
申请号：DE3789162
申请日：1987-05-20
Applicant: NEC CORP
Inventor： NAKAYAMA MAKOTO
Abstract: In a satellite tracking control system, a receiver derirves a pair of elevation (EL) and cross-elevation (XEL) tracking error signals having a quadratic relationship in a coordinate system from a signal received from a polar-orbital satellite. Elevation and cross-elevation motors are respectively controlled in response to the elevation (EL) and cross-elevation (XEL) tracking error signals. An azimuth controller derives an azimuth control signal from angle data representing the angles of the antenna about the azimuth, elevation and cross-elevation axes detected by angle detectors. Preferably, the antenna is rotatable about the elevation (EL) axis in the range between zero and l80 degrees.
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公开(公告)号：CA1298402C
公开(公告)日：1992-03-31
申请号：CA568066
申请日：1988-05-30
Applicant: NEC CORP
Inventor： YAMANE TOSHINOBU , KURAMOTO AKIO , SHIMIZU RYUJI , NAKAYAMA MAKOTO
Abstract: In a tracking system of a stationary satellite, a phased array is used for an antenna mounted on an automobile. The phased array antenna has a sharp beam which is switched between two different directions in azimuth. The antenna beam is switched between the two directions periodically by control of phase constants in a feeding circuit of the antenna and comparison is made in strength between signals received before and after the beam switching to obtain an error signal as an azimuth error signal. Then, the antenna is mechanically moved in azimuth according to the azimuth error signal until the azimuth error signal becomes zero. In a case the antenna beam is also switched between two directions in elevation, the antenna beam is switched in elevation during an interval between successive two times of the beam switching operation in azimuth and detects a difference in strength of signals received before and after the switching in elevation to thereby produce the difference as an elevation error signal. The antenna is mechanically moved in elevation according to the elevation error signal until the elevation error signal becomes zero.
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公开(公告)号：DE3789162T2
公开(公告)日：1994-06-01
申请号：DE3789162
申请日：1987-05-20
Applicant: NEC CORP
Inventor： NAKAYAMA MAKOTO
Abstract: In a satellite tracking control system, a receiver derirves a pair of elevation (EL) and cross-elevation (XEL) tracking error signals having a quadratic relationship in a coordinate system from a signal received from a polar-orbital satellite. Elevation and cross-elevation motors are respectively controlled in response to the elevation (EL) and cross-elevation (XEL) tracking error signals. An azimuth controller derives an azimuth control signal from angle data representing the angles of the antenna about the azimuth, elevation and cross-elevation axes detected by angle detectors. Preferably, the antenna is rotatable about the elevation (EL) axis in the range between zero and l80 degrees.
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公开(公告)号：JPH05242418A
公开(公告)日：1993-09-21
申请号：JP7826392
申请日：1992-02-28
Applicant: NEC CORP , NEC GUMMA LTD
Inventor： HAYAKAWA YUICHI , NAKAYAMA MAKOTO
Abstract: PURPOSE:To improve the characteristics of a magnetic head by improving the magnetic efficiency of the magnetic head. CONSTITUTION:Magnetic cores 5 having three rods, coils 4a, 4b wound around the left and right rods of the magnetic head core 5 and the gaps of the magnetic head core are provided with a back core 1 fixed by being adhered tightly with the flanks of rods at an opposite side. A high magnetic permeability metallic magnetic film 3 is formed at a surface adhered tightly with the magnetic head core 5 of the back core 1. Since leakage magnetic flux can be reduced by interposing the high permeability metallic magnetic film 3, the magnetic efficiency is improved and the characteristics of the magnetic head can be enhanced.
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Patent Agency Ranking
公开(公告)号：JPS63181504A
公开(公告)日：1988-07-26
申请号：JP1357187
申请日：1987-01-22
Applicant: NEC CORP
Inventor： NAKAYAMA MAKOTO
IPC: H01Q3/04
Abstract: PURPOSE:To enable the decision of a peak even if a level variation occurs by deciding that a received signal is extremely large when the level difference between the received signals, before and after antenna driving with a fine angle is executed, becomes less than a previously specified value or when the inverting frequency in a driving direction become the previously specified times. CONSTITUTION:A titled device provides a counting means 6 for counting the inverting frequency in a driving direction and it is constituted so as to decide that the directional direction of an antenna 9 concerning a driving axis coincides with a peak point where the received signal becomes extremely large when the level difference between the received signals before and after the antenna driving with a fine angle is executed becomes less than the proviously specified value or when the inverting frequency in a driving direction reaches the previously specified times as for one driving axis. Even if the level variation occurs in terms of the intensity of incoming wave, following actions proceed without delay, without repeating inverse actions over certain frequency near the peak point.
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公开(公告)号：JPS62134582A
公开(公告)日：1987-06-17
申请号：JP27544085
申请日：1985-12-06
Applicant: NEC CORP
Inventor： NAKAYAMA MAKOTO
Abstract: PURPOSE:To make it possible to properly judge whether a receiving signal level is set to an automatic tracking enabling level, by a method wherein receiving level stored in a receiving level memory means is searched over a time zone up to a specific time based on the present point of time and the max. level value thereof is extracted to be compared and collated with the receiving signal level at the present point of time. CONSTITUTION:The receiving level signal 102 sent from a tracking receiver 2 in a level detection circuit 3 is subjected to A-D conversion to be sent to a level memory circuit 4 and a level comparing circuit 6 as a receiving level value 104. The receiving level value 104 stored in the memory circuit 4 is stored in a form successively renewed as the max. value of the specific time T relating to the variation time characteristics of a receiving electric field and read as a receiving level value 105 to be inputted to a max. level detection circuit 5 where the max. level value 106 thereof is detected to be sent to a level comparing circuit 6 and compared and collated with the receiving level value 104 at the present point of time and, when said max. level value 106 does not exceed a reference level 107, it is decided value 106 does not exceed a reference level 107, it is decided that the max. level value 106 is adapted to an automatic tracking-enabled level.
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公开(公告)号：JPH07183867A
公开(公告)日：1995-07-21
申请号：JP32675793
申请日：1993-12-24
Applicant: NEC CORP
Inventor： NAKAYAMA MAKOTO , IIDA MITSUMOTO
Abstract: PURPOSE:To accurately compensate the degradation of the cross polarized wave of an up link by electrically detecting the cross polarized wave compensation amount of a down link. CONSTITUTION:As for the beacon signal S 7 of a down link, the degradation of a cross polarized wave is compensated by a servo circuit composed of a linearly polarized wave converter 7, a circularly polarized wave converter 8, a cross polarized wave degradation detector 16, a calculation circuit 15 and a driving circuit 14. At this time, when the calibration signal S 13a from an oscillator 13 is supplied to the input terminal of the linearly polarized wave converter 7 by circularly polarized waves via a signal coupler 6, a cross polarized wave degradation detector 17 for calibration signal detects the data S 20 of the degradation of the cross polarized wave of a down link. A calculation circuit 18 calculates compensation amount S 21 of the degradation of the cross polarized wave of an up link based on this data S 20. A driving circuit 19 rotates and drives the linearly polarized wave converter 3 and circularly by polarized wave converter 4 for the compensation of the degradation of the cross polarized wave of the up link by the rotation angle corresponding to this compensation amount S 21.
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公开(公告)号：JPS62274801A
公开(公告)日：1987-11-28
申请号：JP11778386
申请日：1986-05-21
Applicant: NEC CORP
Inventor： NAKAYAMA MAKOTO
IPC: H01Q3/02
Abstract: PURPOSE:To set the maximum turning angular velocity around an orthogonal elevating axis smaller than the eye line angular velocity of a satellite by selecting the turnable range of a three-axis control antenna system around the elevating axis to be nearly 180 deg.. CONSTITUTION:The titled system is provided with an azimuth swing base 2 turned around an azimuth axis 3 fixed vertically, an elevating turning base 4 turnable around an elevating axis provided horizontally on the swing base 2 by nearly 180 deg. and a directivity antenna 6 fiftted to be turned within an angle limited around an orthogonal elevating axis 7 orthogonal to the axis 5 to the turning base 4. A satellite passing by a zenith having a predetermined elevating angle or over is traced by applying the turning around the elevating axis 5 continuously in excess of the elevating angle of 90 deg.. Thus, the antenna is turned by nearly 180 deg. in excess of the elevating angle 90 deg. around the elevating axis so as to limit the maximum turning angular velocity around the orthogonal elevating axis 7 to the eye line angle or below.
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公开(公告)号：JPH02216902A
公开(公告)日：1990-08-29
申请号：JP3748789
申请日：1989-02-16
Applicant: NEC CORP
Inventor： NAKAYAMA MAKOTO
Abstract: PURPOSE:To attain the conical scan of a beam without using any frictional part like a rotary bearing, etc., and to ensure the high reliability with no maintenance operation required by supporting elastically a secondary reflector and driving magnetically this reflector so as to make move circularly in parallel within a plane orthogonal to the center axis of the reflector. CONSTITUTION:A conical scanning antenna contains a main reflector 1, a secondary reflector 2, and a primary radiator 3. A support mechanism 6 is added to the scanning antenna to support elastically the reflector 2 so as to make it move in parallel in an optional direction orthogonal to the center axis of the reflector 2. Furthermore, the magnetic driving means 8 and 9 are added to the scanning antenna to move the reflector 2 circularly in parallel in response to the driving signals. Thus it is possible to perform the conical scan of a beam with out use of a frictional part and to improve the reliability of the antenna.
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