Method and means for providing a synthetic real world runway centerline display
阅读：421发布：2023-10-19
专利汇可以提供Method and means for providing a synthetic real world runway centerline display专利检索，专利查询，专利分析的服务。并且A system in an aircraft for displaying a perspective view of a synthetic runway centerline on a cathode-ray tube in a heads-up display system for guiding a pilot while landing an aircraft on the real world runway at an airport when visibility is poor. The perspective of the synthetic runway centerline changes in accordance with changes in the position of the aircraft to the runway at the airport. Beacons located at each end of the runway''s centerline provide signals to a receiver in the aircraft. The receiver provides signals corresponding to the positions of the beacons. A signal generator provides deflection voltages for a synthetic runway centerline display to a computer which modifies the deflection voltages in accordance with the signals from the receiver. The cathode-ray tube provides the perspective synthetic runway centerline display in accordance with the modified deflection voltages.，下面是Method and means for providing a synthetic real world runway centerline display专利的具体信息内容。
1. A system for displaying in an aircraft landing at an airport a perspective synthetic runway centerline, comprising beacons located at each end of the centerline of the airport runway and transmitting signals, means on the aircraft for receiving the signals form the beacons and providing pulse trains corresponding to the positions of the beacons, voltage means on the aircraft for providing deflection voltages and bright-up pulse voltages for a synthetic runway centerline, means connected to the receiving means and to the voltage means for modifying the deflection voltages in accordance with the pulse trains from the receiving means, and a cathode-ray tube connected to the modifying means and to the voltage means for displaying the perspective synthetic runway centerline in accordance with the modified deflection voltages and the bright-up pulse voltages from the modifying means and from the voltage means, respectively; each cycle of a predetermined programming means for programming the deflection voltages divided into four time periods and the voltage means including means for providing a first horizontal deflection voltage, means for providing a second horizontal deflection voltage, means for providing a vertical deflection voltage, means for providing the bright-up pulse voltages, said programming means for controlling the deflection voltage means and the bright-up pulse voltage means and providing control signals and timing pulses, and a counter connected to the said programming means and to all the deflection voltage means for counting the timing pulses and providing a digital output to all the deflection voltage means corresponding thereto and being reset by the said programming means at the start of the first and second time periods; and the bright-up pulse voltage means including a diode matrix, and a decoder connecting the matrix to the said programming means for controlling the matrix to provide the bright-up pulse voltages in accordance with a signal from the said programming means.
2. A system of the kind described in claim 1 further comprising means for providing voltages for an artificial horizon display; and switching means connected to the artificial horizon voltage means, to the modifying means, to the voltage means, and to the cathode-ray tube for alternately applying the voltages from the artificial horizon voltage means and the modified deflection voltages and the bright-up pulse voltages from the modifying means and voltage means, respectively, to the cathode-ray tube at a predetermined rate so that the cathode-ray tube appears to simultaneously display the synthetic runway centerline and the artificial horizon.
3. A system of the kind described in claim 1 in which the first horizontal deflection voltage means includes a digital-to-analog converter connected to the counter and receiving a positive direct current voltage for converting the digital output from the counter to a positive going ramp voltage in accordance with the positive direct current positive voltage, summing means having two inputs and providing the first horizontal deflection voltage in accordance with the sum of the signals applied to its inputs, and switching means connected to the programming means, to the converting means, to both inputs of the summing means and to ground and receiving a negative direct current voltage and positively controlled by the programming means to ground both inputs of the summing means during the first and fourth time periods, to pass the ramp voltage from the converter to one input of the summing means while grounding the other input during the second time period and to pass the ramp voltage from the converter to one input and the negative direct current voltage to the other input of the summing means during the third time period.
4. A system of the kind described in claim 1 in which the second horizontal deflection voltAge means includes a digital-to-analog converter connected to the counter and receiving a negative direct current voltage for converting the digital output from the counter to a negative going ramp voltage in accordance with the negative direct current voltage, and summing means connected to the converter and receiving a positive direct current voltage for summing the ramp voltage from the converter with the positive direct current voltage to provide the second horizontal deflection voltage.
5. A system of the kind described in claim 1 in which the vertical deflection voltage means includes a digital-to-analog converter connected to the counter and receiving a positive direct current voltage for converting the output from the counter to a positive going ramp voltage in accordance with the positive direct current voltage, summing means having two inputs and providing the vertical deflection voltage in accordance with the sum of the signals applied to its inputs, and switching means connected to the programming means, to the converter and receiving two negative direct current voltages and a positive direct current voltage and positively controlled by the programming means to pass the ramp voltage from the converter to one input of the summing means during the first time period and to block the ramp voltage so as to provide a zero amplitude signal to the one input of the summing means during the second and third time periods, and to pass one negative direct current voltage, the other negative direct current voltage and the positive current voltages to the other input of the summing means during the first, second and third time periods, respectively.
6. A system of the kind described in claim 1 in which the modifying means includes two pulse train processing channels, each processing channel including means connected to the receiving means for converting a pulse train from the receiving means to direct current voltages, each direct current voltage corresponding to the position of a different beacon, means connected to the converting means for providing a signal corresponding to the difference between the direct current voltages, a voltage divider connected to the difference means for providing a signal corresponding to one-half of the difference signal, and one processing channel further includes multiplying means connected to the vertical deflection voltage means and to the difference means for multiplying the difference signal with the vertical deflection voltage and providing a signal corresponding thereto, and summing means connected to the multiplying means and to the voltage divider for summing the signals from the multiplying means and the voltage divider to provide a modified vertical deflection voltage, and the other processing channel further includes multiplying means connected to the difference means and to the second horizontal deflection voltage means for multiplying the difference signal with the second horizontal deflection voltage, and summing means connected to the first horizontal deflection voltage means, to the multiplying means and to the voltage divider for summing the first horizontal deflection voltage with the signals from the multiplying means and from the voltage divider to provide a modified horizontal deflection voltage.
7. A system of the kind described in claim 6 in which each converting means includes switching means connected to the receiving means and controlled by the receiving means for separating the pulses in a pulse train according to corresponding beacons, means connected to the switching means for stretching the pulses, a plurality of hold circuits, each hold circuit being connected to a corresponding pulse stretching means and holding the pulses from the pulse stretching means to provide a corresponding direct current voltage.
8. A system of the kind described in claim 7 further comprising control means connecting the difference means to the hold circuits for controlling direct current voltages from the hold circuits so that the difference signal is a positive direct current signal.
9. A system of the kind described in claim 8 in which the control means includes comparing means connected to the pulse stretching means of the processing channel providing the modified vertical deflection voltage for comparing the pulses from the pulse stretching means and providing an output when the pulses from one pulse stretching means have a greater amplitude than the pulses from the other pulse stretching means, and switching means in each processing channel connecting the pulse stretching means in that channel to the hold circuits in that channel and passing the pulses from one pulse stretching means to one hold circuit and the pulses from the other pulse stretching means to the other hold circuit in response to an output from the comparing means and passing the pulses from the one pulse stretching means to the other hold circuit and the pulses from the other pulse stretching means to the one hold circuit when the comparing means provides no output.
10. A system of the kind described in claim 7 in which the switching means includes a flip-flop connected to the receiving means and triggered by a pulse train to provide a pulse train output having half the repetition rate of the pulse train from the receiving means, and an electronic switch in each processing channel connecting the receiving means to each pulse stretching means and controlled by the pulse train from the flip-flop to pass a pulse train from the receiving means to one pulse stretching means in response to a pulse in the pulse train from the flip-flop and to pass the second mentioned pulse train from the receiving means to the other pulse stretching means during the absence of a pulse in the pulse train from the flip-flop.
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