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公开(公告)号：US3870321A
公开(公告)日：1975-03-11
申请号：US38463773
申请日：1973-08-01
申请人： DECCA LTD
IPC分类号： G11B17/028 , H04N5/83 , G11B3/60
CPC分类号： G11B17/0282 , H04N5/83
摘要： A rotary assembly comprising in combination a drive member which is rotatable about an axis and a driven member which is rotatable by the drive member about said axis by means of a balanced threepoint kinematic support, wherein the support consists of three parts each consisting of a ridged projection on one of the members and a complementary notched region in the other member, two of the said notched regions are disposed on a circle centred on the said axis and the third notched region is directed radially with respect to the said axis.
摘要翻译： 一种旋转组件，其包括可围绕轴线旋转的驱动构件和由所述驱动构件通过平衡的三点运动学支撑件绕所述轴线旋转的从动构件，其中，所述支撑件由三部分组成，每个部分由 一个构件上的脊状突起和另一个构件中的互补缺口区域，两个所述凹口区域设置在以所述轴为中心的圆上，并且所述第三缺口区域相对于所述轴线径向地指向。
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公开(公告)号：US3855594A
公开(公告)日：1974-12-17
申请号：US35660773
申请日：1973-05-02
申请人： DECCA LTD
发明人： BOTCHERBY S
摘要： A multiple frequency continuous wave radar in which two Doppler signals derived from different transmitted frequencies are multiplied together and the product signal, after integration, controls a waveform generator which switches the transmitted frequency. The difference between the transmitted frequency is controlled to render the Doppler signals in quadrature and a range indicator responds universely to the frequency difference. Another Doppler signal is multiplied with one of the first two in a circuit which corrects ambiguity.
摘要翻译： 将来自不同发射频率的两个多普勒信号相乘的多频连续波雷达，积分后的乘积信号控制切换发射频率的波形发生器。 控制发射频率之间的差异，使得正交的多普勒信号和范围指示器对频率差异全面响应。 另一个多普勒信号与纠正模糊度的电路中的前两个信号相乘。
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公开(公告)号：US3725932A
公开(公告)日：1973-04-03
申请号：US3725932D
申请日：1970-11-09
申请人： DECCA LTD
发明人： HUGHES D
CPC分类号： G01S1/306
摘要： In a phase comparison radio navigation system in which a receiver may be operated with signals from a number of different chains of transmitting stations, each chain using radiations on a number of different harmonics nf of a common fundamental frequency f, the different chains using different fundamental frequencies, the receiver is provided with an oscillator and divider chain feeding a syntheizer matrix to form a frequency syntheizer to provide heterodyne signals of frequency n Delta for changing the frequencies of the received signals from harmonics of f to harmonics of F where F a fixed frequency used in the receiver for all chains. This oscillator and divider chain also provides timing signals for effecting a digital phase comparison between multiple frequency signals radiated in turn for short periods from the various stations to provide lane identification (for resolving ambiguities in the much more highly accurate but ambiguous normal position line determination).
摘要翻译： 在相位比较无线电导航系统中，其中接收机可以利用来自多个不同链路的发射台的信号进行操作，每个链路使用在共同基频f的多个不同谐波nf上的辐射，不同的链路使用不同的基波 接收机设置有振荡器和分频器链，馈送合成器矩阵以形成频率合成器，以提供频率n DELTA的外差信号，用于将接收信号的频率从f的谐波改变为F的谐波，其中F是固定频率 在接收机中用于所有链。 该振荡器和分频器链还提供定时信号，用于实现从各个站点轮流短时间辐射的多个频率信号之间的数字相位比较，以提供车道识别（用于在更高精度但模糊的正常位置线确定中解决模糊） 。
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公开(公告)号：US3705403A
公开(公告)日：1972-12-05
申请号：US3705403D
申请日：1970-11-09
申请人： DECCA LTD
CPC分类号： G01S1/306
摘要： In a receiver for a phase comparison radio navigation system, signals of the fifth, sixth, eighth and ninth harmonics of a fundamental are received from different spaced transmitting stations and compared in phase in pairs at their least common multiple frequencies and in which a phase comparison is made between signals from the same pairs of stations at the fundamental frequency to obtain coarser but less ambiguous positional information, the fundamental frequency comparisons are effected digitally measuring the time intervals corresponding to the phase relationships. These time intervals are measured using divided down frequencies from a single clock source, the clock frequency division factors being different for the different pairs of stations so that the counts are proportional to the least common multiple frequencies.
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公开(公告)号：US3699558A
公开(公告)日：1972-10-17
申请号：US3699558D
申请日：1970-07-13
申请人： DECCA LTD
CPC分类号： G01C17/26
摘要： A rotatable insulating disc carries a closed grid of conductors over one part of one side and a similar but open grid over another part. An oscillator is coupled to a coil which is parallel to the disc and produces a cyclically varying but symmetrical field through the disc. Two pairs of pick-up coils sense, for respective orthogonal directions, the distortion of the field by the closed grid and detector circuits coupled to the pick-up coils provide signals representing the sine and cosine of the angular position of the disc which may carry a compass needle.
摘要翻译： 可旋转绝缘盘在一侧的一部分上具有封闭的导体格栅，并且在另一部分上具有类似但敞开的格栅。 振荡器耦合到与盘平行的线圈，并通过盘产生循环变化但对称的场。 两对拾取线圈对于各个正交方向感测由闭合栅格的场的失真，并且耦合到拾取线圈的检测器电路提供表示可以承载的盘的角位置的正弦和余弦的信号 罗盘针。
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公开(公告)号：US3571684A
公开(公告)日：1971-03-23
申请号：US3571684D
申请日：1969-08-12
申请人： DECCA LTD
发明人： BECH MOGENS ILSTED
CPC分类号： G05D1/0206
摘要： A rudder positioning unit for the steering systems of ships serves to position the rudder at an angle proportional to a rudder positioning signal received by the unit, and comprises a balance circuit having a balance signal output controlling start and stop of the steering gear of the ship, said balance circuit having inputs for the rudder positioning signal and for a feedback signal from a steering gear simulator, that is started and stopped simultaneously with the steering gear and is capable of simulating the movement of the steering gear, but at a smaller time lag than the latter or practically no time lag at all, preferably in the form of an electrical voltage. Means are provided for continuously effecting slow synchronization of the simulator with the steering gear, and for effecting quick synchronization on occurrence of a predetermined deviation between the simulator and the steering gear. A preferred form of a steering gear simulator is an electronic integrator circuit.
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公开(公告)号：US3480954A
公开(公告)日：1969-11-25
申请号：US3480954D
申请日：1968-10-10
申请人： DECCA LTD
发明人： GRAY TREVOR , NEISH DAVID ANTHONY
CPC分类号： G01S13/60
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10.发明授权Photoelectric detecting apparatus for the passage of an object through an aperture utilizing the overshoot pulse from the detector 失效光电检测装置，用于通过利用来自检测器的过冲脉冲通过孔的物体通过
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