Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
111 words
In an amplitude comparison, direction finding receiving system having at least two channels, each channel of which includes a receiver and an associated logarithmic amplifier, a calibration means for said logarithmic amplifiers comprising: first means for generating an exponentially decaying calibration signal; second means for generating a plurality of sample pulses each separated by a time increment corresponding to a predetermined db change in said calibration signal; means for connecting said calibration signal to said logarithmic amplifiers; and means for determining the output of each of said logarithmic amplifiers at the time of each of said sample pulses, thereby providing a plurality of calibration points for each of said logarithmic amplifiers.
Claim 2
Dependent Claim
111 words
In an amplitude comparison, direction finding receiving system having at least two channels, each channel of which includes a receiver and an associated logarithmic amplifier, a calibration means for said logarithmic amplifiers comprising: first means for generating an exponentially decaying calibration signal; second means for generating a plurality of sample pulses each separated by a time increment corresponding to a predetermined db change in said calibration signal; means for connecting said calibration signal to said logarithmic amplifiers; and means for determining the output of each of said logarithmic amplifiers at the time of each of said sample pulses, thereby providing a plurality of calibration points for each of said logarithmic amplifiers.
Claim 3
Dependent Claim
42 words
The calibration means of claim 1 wherein each of said channels further includes an analog-to-digital converter connected to the output of its associated logarithmic amplifier, said means for determining comprises means for clocking each of said analog-to-digital converters by said sample pulses.
Claim 4
Dependent Claim
59 words
The calibration means of claim 2 wherein said first means for generating comprises: a high Q resonator; an amplification means for amplifying the output of said resonator and providing said amplified output as an input signal to said resonator; and means for reducing the gain of said amplification means to initiate an exponential decay of said resonator output signal.
Claim 5
Dependent Claim
14 words
THe calibration means of claim 3 wherein said high Q resonator comprises a crystal.
Claim 6
Dependent Claim
40 words
The calibration means of claim 3 wherein said second means for generating comprises: an oscillator means having a cyclical output signal; and means for generating a sample pulse each time a predetermined number of oscillator cyclical output signals have occurred.
Claim 7
Independent Claim
83 words
A method for calibrating a logarithmic amplifier comprising the steps of: generating an exponentially decaying calibration signal; generating a plurality of sample pulses each occurring when said calibrated signal has decayed by a predetermined db increment; amplifying said calibration signal by said logarithmic amplifier; and determining an output value of said logarithmic amplifier each time one of said sample pulses is generated, said output values comprising a plurality of calibration points each separated from an adjacent calibration point by said predetermined db increment.
Claim 8
Independent Claim
83 words
A method for calibrating a logarithmic amplifier comprising the steps of: generating an exponentially decaying calibration signal; generating a plurality of sample pulses each occurring when said calibrated signal has decayed by a predetermined db increment; amplifying said calibration signal by said logarithmic amplifier; and determining an output value of said logarithmic amplifier each time one of said sample pulses is generated, said output values comprising a plurality of calibration points each separated from an adjacent calibration point by said predetermined db increment.
Claim 9
Dependent Claim
78 words
A calibration means for a logarithmic amplifier comprising: first means for generating an exponentially decaying calibration signal; and second means for generating a sample pulse each time said calibration signal decays by a predetermined db increment whereby said calibration signal comprises an input signal to said logarithmic amplifier to be calibrated and said logarithmic amplifier output signal values at the time of each sample pulse comprise a plurality of calibration points each separated by said predetermined db increment.
Claim 10
Dependent Claim
78 words
A calibration means for a logarithmic amplifier comprising: first means for generating an exponentially decaying calibration signal; and second means for generating a sample pulse each time said calibration signal decays by a predetermined db increment whereby said calibration signal comprises an input signal to said logarithmic amplifier to be calibrated and said logarithmic amplifier output signal values at the time of each sample pulse comprise a plurality of calibration points each separated by said predetermined db increment.
Claim 11
Dependent Claim
40 words
The calibration means of claim 7 wherein said first means for generating comprises: a high Q resonator; means for exciting said resonator to an energy level; and means of initiating said exponentially decaying calibration signal from said excited energy level.
Claim 12
Dependent Claim
14 words
The calibration means of claim 8 wherein said high Q resonator comprises a crystal.
Claim 13
Dependent Claim
21 words
The calibration means of claim 8 wherein said means for initiating comprises a voltage-controlled attenuator for interrupting said means for exciting.
Claim 14
Dependent Claim
40 words
The calibration means of claim 10 wherein said second means for generating comprises: a signal generator for providing a plurality of timing signals; and means for providing one of said sample pulses after a predetermined number of said timing signals.
Claim 15
Dependent Claim
51 words
The calibration means of claim 11 further comprising: a computer controlled AND gate; means for providing said sample pulses to said AND gate; and means for providing a calibrate signal from said computer to said AND gate whereby said AND gate is enabled to pass a predetermined number of sample pulses.
Claim 16
Dependent Claim
54 words
The calibration means of claim 9 wherein said means for exciting comprises: an amplification means; and means for connecting said amplification means in series with a feedback line connecting said crystal output terminal and said crystal input terminal, thereby allowing said crystal to be excited to an energy level determined by said amplification means.
Claim 17
Dependent Claim
50 words
The calibration means of claim 11 wherein said signal generator is a high stability oscillator, further comprising means for mixing said oscillator output signal and said high Q resonator output signal, thereby providing a second exponentially decaying calibration signal at a frequency different from that of said high Q resonator.