Fast search and lock-on means for distance measuring equipment
First Claim
1. In an electronic ranging system, means for generating a range gate in time synchronism with replies to successive transmitted pulses, comprising voltage sweep generating means responsive to the time occurrence of an initial and subsequent ones of said transmitted pulses to generate a sweep output waveform having a predetermined slope, reference voltage generating means responsive to an initial transmitted pulse to generate a reference output waveform having a slope less than that of said sweep generator output waveform, range gate generating means responsive to the relative magnitudes of said reference and sweep generating means to generate said range gate, means responsive to successive ones of said range gates to enable said reference voltage generating means, and means responsive to the first reply pulse received after the generation of successive ones of said range gates to disable said reference voltage generating means
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Abstract
A fast search system for DME generates range gates at the time an analog sweep voltage rises to the magnitude of an analog integrator waveform, the latter having a slope less than that of the sweep voltage and provided with a constant current source input. The current source is selectively inhibited by digital control means responsive to the relative time occurrence of range gates and reply pulses such that the range gate occurs during an instant interrogation period at a point in time corresponding to a predetermined percentage of the time at which appeared the first received reply pulse in a preceding interrogation period.
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Citations
10 Claims
- 1. In an electronic ranging system, means for generating a range gate in time synchronism with replies to successive transmitted pulses, comprising voltage sweep generating means responsive to the time occurrence of an initial and subsequent ones of said transmitted pulses to generate a sweep output waveform having a predetermined slope, reference voltage generating means responsive to an initial transmitted pulse to generate a reference output waveform having a slope less than that of said sweep generator output waveform, range gate generating means responsive to the relative magnitudes of said reference and sweep generating means to generate said range gate, means responsive to successive ones of said range gates to enable said reference voltage generating means, and means responsive to the first reply pulse received after the generation of successive ones of said range gates to disable said reference voltage generating means
Specification