Gyromagnetic compass system
阅读：179发布：2022-06-25
专利汇可以提供Gyromagnetic compass system专利检索，专利查询，专利分析的服务。并且A gyromagnetic compass system for navigable craft which utilizes solid state electronic circuits to provide a heading output including only the desired long term components of magnetic heading and short term components of inertial heading; a differential device having one part fixed relative to the gyro and another part positioned by the gyro is provided whereby the output of the differential normally includes both short and long term components of inertial heading; the differential output is compared with the magnetic heading components and the resulting difference output signal is integrated and applied to the fixed part of the differential device, whereby the output of the differential device includes only the long term components of magnetic heading and the short term components of inertial heading. The improvement herein disclosed greatly increases the reliability and maintainability of such a system by eliminating all electromechanical devices and by processing all the involved data in wholly solid state electronic computation circuits. One embodiment employs a digital computer for performing the computation function.，下面是Gyromagnetic compass system专利的具体信息内容。
1. In a gyromagnetic compass system for aircraft including a magnetic compass for providing a first signal having both desired long term and undesired short term components of the magnetic heading of the aircraft, a directional gyroscope for providing a second signal having both desired short term and undesired long term components of the inertial heading of the aircraft, differential means having a part fixed relative to said gyroscope and a part positioned by said gyroscope whereby the output of said differential means includes said desired long term component of said magnetic heading signal and said desired short term component of said inertial heading signal and a system output means connected to receive the output of said differential means, the combination comprising, a. wholly electronic computer means including means responsive to said first and second signals for providing a signal continuously representative of the difference therebetween, b. a source of periodically varying timing signals the period of said signals being much longer than the period of said short term components of said first and second signals, c. means responsive to said timing signals for sampling said difference signal at the period of said timing signals and providing an output which varies at a rate corresponding to the period of said timing signals, and d. means for supplying the output of said sampling means to the fixed part of said differential means whereby to cancel the long term components of said second signal and render said system output means responsive only to the long term components of said first signal and the short term components of said second signal.
2. The compass system as set forth in claim 1 wherein said electronic computer means further comprises, a. memory means, b. means for storing said first and second signals in said memory means, c. a second source of periodically varying timing signals having a period much shorter than the period of the short term components of said first and second signals, d. first means responsive to said second timing signals for continuously updating the values of said first and second signals in said memory means to their instantaneous values, and e. second means responsive to said second timing signals for comparing said memorized first and second signals and for providing said continuous difference signal.
3. The compass system as set forth in claim 2 wherein said second means includes, a. means for storing said difference signal in said memory means, b. means responsive to said first mentioned source of timing signals for updating the value of said dIfference signal, and c. means for supplying said updated difference signal to said differential means.
4. The compass system as set forth in claim 3 wherein said second source of timing signals has a period on the order of thousands of cycles per second and said first source of timing signals has a period on the order of 1 cycle per second.
5. The compass system as set forth in claim 3 further including means for rapidly synchronizing said magnetic compass and said gyroscope comprising, a. means for rendering said sampling means unresponsive to said first timing signals and rendering the same responsive to said second timing signals whereby to substantially instantaneously synchronize said magnetic compass and said gyroscopic means.
6. The compass system as set forth in claim 3 further including means for compensating said gyroscope means for the effects of earth'' s rotation comprising, a. means for providing a signal corresponding to the latitude of operation of said aircraft, and b. means responsive to said latitude signal for effectively altering the period of said first timing signal.
7. The compass system as set forth in claim 3 wherein said electronic computer means comprises a digital computer and wherein a. said first and second signals are analog signals and are converted to corresponding digital signals, wherein b. said memory means comprises a digital memory for storing said digitized signals, wherein c. said difference signal is the digital difference between said stored digitized first and second signals, wherein d. said second source of timing signal comprises a master clock operating at a frequency on the order of 1 megahertz and said first source of timing signals includes frequency dividing means responsive to said master clock for providing an output frequency on the order of 1 hertz, and wherein e. said updated digital difference signal is converted to an analog signal prior to being supplied to said differential means.
8. The compass system as set forth in claim 1 wherein said differential means comprises a differential sine/cosine resolver and wherein said first and second signals are each analog sine/cosine values of said magnetic heading and inertial heading angles and wherein said electronic computer means comprises, a. difference angle computer means responsive to the sine/cosine values of said first and second signals for providing an analog output which varies as the sine function of the difference between said magnetic and inertial heading angles, and wherein b. said sampling means comprises digital logic means responsive to the output of said difference angle computer and said first mentioned timing signals, c. counter means responsive to the output of said logic means for providing a digital signal varying at the rate of said first mentioned timing signals, d. digital to analog converter means responsive to the output of said counter means for supplying corresponding analog sine and cosine signals, and e. means for supplying sine and cosine signals to the corresponding windings of said sine/cosine differential resolver means.
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