초록 ▼

Apparatus for a digital averaging filter, particularly suited for use with an aeronautical navigation receiver, for reducing oscillatory deviation errors that appear in a course deviation voltage produced by the receiver and occur as the result of reflected incoming radio-navigation signals and/or i

Apparatus for a digital averaging filter, particularly suited for use with an aeronautical navigation receiver, for reducing oscillatory deviation errors that appear in a course deviation voltage produced by the receiver and occur as the result of reflected incoming radio-navigation signals and/or interfering signals as described. In essence, this apparatus first amplifies, filters and repetitively samples the course deviation voltage to provide digital representations thereof. Each digital representation is then converted by a digital to pulse count converter into a series of pulses wherein the value of each digital representation is encoded into the number of pulses in the series. Thereafter, these pulses are totalized over a pre-defined interval. The resulting totalized count is then divided to produce an average value, which at the end of the pre-defined interval accurately reflects the average course deviation error. Advantageously, this average value is substantially free of any oscillatory deviation errors. This average value is then converted to an equivalent analog value for eventual display on a course deviation indicator.

대표청구항 ▼

Apparatus for a filter, adapted for use in conjunction with an aeronautical navigation receiver and operative in response to a zero centered course deviation voltage, for reducing oscillatory error components present in said course deviation voltage, said apparatus comprising: means for sampling sai

Apparatus for a filter, adapted for use in conjunction with an aeronautical navigation receiver and operative in response to a zero centered course deviation voltage, for reducing oscillatory error components present in said course deviation voltage, said apparatus comprising: means for sampling said course deviation voltage to yield corresponding digital signal representations thereof: means, operative in response to said digital signal representations, for converting each of said digital signal representations into a corresponding series of pulses, wherein the number of pulses in said series is defined by the value of said digital representation; means, responsive to said pulse series, for accumulating the total number of individual pulses in every one of said pulse series that occurs during a pre-defined period of time in order to produce a totalized value; means for calculating an average value in response to said totalized value when said pre-defined time period has elapsed and for applying said average value to converting means; means for converting said average value to a form suitable for display on a course deviation meter, wherein said average value is substantially free of said oscillatory error components; and means, connected to said calculating means and said accumulating means for resetting said average value and said totalized values to respective first and second pre-defined values after said average value has been applied to said converting means.