Gravina, Anthony N.; Lev, Kenneth D.; Angst, Arthur H.;

Rate measuring system

A rate measuring system for providing velocity signals, as desired, and displacement signals, including at least one accelerometer for providing an output voltage proportional to an acceleration input, amplifying means having an adjustable voltage gain for amplifying the output voltage from the accelerometer, means for integrating the amplifier output voltage to provide an output voltage proportional to velocity, means for comparing the output voltage proportional to the acceleration input and the output voltage proportional to velocity with predetermined voltage reference levels to provide an output signal when these signals are nominally zero, and means for shorting out the integrating means in response to a signal from the comparison means to provide a nominal zero velocity output.

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What is claimed is:

1. A rate measuring system, comprising:

(a) at least one accelerometer for providing an output voltage proportional to an acceleration input;

(b) amplifying means connected to the output of said accelerometer for amplifying said voltage proportional to acceleration, said amplifying means having an adjustable voltage gain for changing the scale of the output voltage from said accelerometer to provide full scale, multi-range operation over the entire range of acceleration inputs;

(c) an integrator;

(d) first comparator means connected to the output of said accelerometer for producing an output when the voltage from a accelerometer exceeds said predetermined value;

(e) first switch means responsive to the output from said first comparator means for connecting the output of said amplifying means to the input of said integrator when said accelerometer voltage exceeds said predetermined value;

(f) second comparator means connected to the output of said integrator for producing an output when the voltage from said integrator exceeds a predetermined value; and

(g) second switch means connected across said integrator and responsive to the outputs from said first and second comparator means for bypassing said integrator to provide a nominal zero velocity output signal when the inputs to said first and second comparator means are below predetermined values.

2. A rate measuring system comprising:

(a) at least one accelerometer for providing an output voltage proportional to an acceleration input;

(b) amplifying means connected to the output of said accelerometer for amplifying said voltage proportional to acceleration, said amplifying means having an adjustable voltage gain for changing the scale of the output voltage from said accelerometer to provide full scale multi-range operation over the entire range of acceleration inputs;

(c) a first integrator;

(d) first comparator means connected to the output of said accelerometer for producing an output when the voltage from said accelerometer exceeds a predetermined value;

(e) first switch means responsive to the output from said first comparator means for connecting the output of said amplifying means to the input of said first integrator when said accelerometer voltage exceeds said predetermined value;

(f) second comparator means connected to the output of said first integrator for producing an output when the voltage from said first integrator exceeds a predetermined value;

(g) second switch means connected across said first integrator and responsive to the outputs from said first and second comparator means for bypassing said first integrator to provide a nominal zero velocity output signal when the inputs to said first and second comparator means are below predetermined values;

(h) a second integrator connected to the output of the first integrator;

(i) third comparator means connected to the output of said second integrator for producing an output when the voltage from said second integrator exceeds a predetermined value; and

(j) third switch means connected across said third integrator and responsive to the outputs from said first and third comparators for bypassing said second integrator to produce a nominal zero displacement output signal when the inputs to said first and third comparators are below predetermined values.