Delay stabilizing system
First Claim
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1. A method for stabilizing delay of a second pulse in a transponder when a first pulse of equal amplitude to that of the second pulse and the second pulse are sequentially present in at least a single pulse train in a receiver of the transponder, the method comprising the steps of:
- measuring the amplitude of the first pulse in the receiver of the transponder;
controlling gain of the receiver as a function of said measured amplitude, said gain being held constant over a period of time including said second pulse;
detecting a preset threshold level of only the second pulse at an output of said receiver; and
triggering a transmitted signal from the transponder responsive to said threshold detection.
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Abstract
A system for stabilizing the amplitude and, thus, the delay of a signal pulse subsequent to the first interrogating signal pulse to a transponder used in a range measurement system. AGC level in the transponder is set responsive to the first interrogating pulse and is held for a time period encompassing the subsequent pulse.
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Citations
9 Claims
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1. A method for stabilizing delay of a second pulse in a transponder when a first pulse of equal amplitude to that of the second pulse and the second pulse are sequentially present in at least a single pulse train in a receiver of the transponder, the method comprising the steps of:
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measuring the amplitude of the first pulse in the receiver of the transponder; controlling gain of the receiver as a function of said measured amplitude, said gain being held constant over a period of time including said second pulse; detecting a preset threshold level of only the second pulse at an output of said receiver; and triggering a transmitted signal from the transponder responsive to said threshold detection. - View Dependent Claims (2, 3, 4, 5)
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6. In a range measurement system comprising a radar and a transponder wherein the transponder is interrogated by a series of pulse trains from the radar, each of the pulse trains comprising at least a first pulse having an amplitude, an improvement in the transponder comprising in combination:
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means for sensing the amplitude of the first pulse of each of said series of pulse trains; means for controlling the gain of a receiver in the transponder, said controlling means being responsive to said sensed amplitude of the first pulse, to establish a constant output signal amplitude from the receiver for a period of time, said period of time encompassing the introduction and passage of at least one subsequent pulse in the receiver to stabilize delay of said at least one subsequent pulse in the receiver. - View Dependent Claims (7, 8, 9)
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Specification