Apparatus and method for detecting the cessation of motion of a body
First Claim
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1. An apparatus for detecting when a moving body assumes a substantially motionless state comprising:
- rate of turn sensor means attached to said body for generating a rate of turn signal exhibiting an amplitude which is proportional to the rate of turn of said body;
differentiator means, electrically coupled to said sensor means, for differentiating said rate of turn signal to generate a differentiated signal;
absolute value circuit means, electrically coupled to said differentiator means, for generating an absolute value signal equal to the absolute value of said differentiated signal;
limiter means, electrically coupled to said absolute value circuit means, for limiting the amplitude of said absolute value signal to a predetermined signal level, thereby generating a limited signal;
filtering means, electrically coupled to said limiter means, for filtering said limited signal, thereby generating an filtered signal, andcomparator means, electrically coupled to said filter means, for generating a first signal when said filtered signal is less than a predetermined voltage level to indicate that said body is substantially motionless.
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Abstract
An apparatus and a method are provided for determining when a moving body assumes a motionless state. A rate of turn sensor is attached to the moving body. A signal indicating that the body is substantially motionless is generated when the rate of turn signal generated by the sensor is substantially constant.
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Citations
6 Claims
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1. An apparatus for detecting when a moving body assumes a substantially motionless state comprising:
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rate of turn sensor means attached to said body for generating a rate of turn signal exhibiting an amplitude which is proportional to the rate of turn of said body; differentiator means, electrically coupled to said sensor means, for differentiating said rate of turn signal to generate a differentiated signal; absolute value circuit means, electrically coupled to said differentiator means, for generating an absolute value signal equal to the absolute value of said differentiated signal; limiter means, electrically coupled to said absolute value circuit means, for limiting the amplitude of said absolute value signal to a predetermined signal level, thereby generating a limited signal; filtering means, electrically coupled to said limiter means, for filtering said limited signal, thereby generating an filtered signal, and comparator means, electrically coupled to said filter means, for generating a first signal when said filtered signal is less than a predetermined voltage level to indicate that said body is substantially motionless. - View Dependent Claims (2, 3, 4)
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5. A method of detecting when a moving body assumes a substantially motionless state comprising the steps of;
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A. sensing the rate of turn of said body to generate a rate of turn signal exhibiting an amplitude which is proportional to the rate of turn of said body; B. differentiating said rate of turn signal to generate a differentiated signal; C. generating an absolute value signal equal to the absolute value of said differentiated signal; D. limiting the amplitude of said absolute value signal to a predetermined signal level to generate a limited signal; E. filtering said limited signal to generate an filtered signal, and F. comparing said filtered signal to a predetermined voltage level to generate a first signal when said filtered signal is less than said predetermined voltage level to indicate that said body is substantially motionless. - View Dependent Claims (6)
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Specification