Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
259 words
A system for measuring the angle of arrival and the frequency of a radiated wave with respect to a defined line, comprising in combination, a. first and second input terminals for receiving said radiated wave defining points of arrival and said defined line; b. first and second local frequency oscillator means for supplying first and second preset different frequencies separated by a predetermined number of herz in the frequency spectrum; c. first and second mixers receiving said respective first and second inputs from said input terminals and said local oscillator means providing first and second beat frequencies; d. first and second filter means included with said first and second mixers to select as output predetermined frequency components of said beat frequencies; e. a first phase comparator coupled to said first and second mixers providing a first train of pulses separated by a time corresponding to the difference in the local frequencies; f. a second phase comparator coupled to said first and second local oscillators also providing a train of pulses separated by a difference corresponding to the local frequencies, the time separation between corresponding pulses in said two pulse trains being a function of the angle of arrival and the frequency of the incoming wave; and, g. a third phase comparator coupled to said first and second mixers also providing a train of pulses separated by a difference corresponding to the local frequencies, the time separation between the third and second pulse trains being a second function of the angle of arrival and the frequency of the incoming wave.
Claim 2
Independent Claim
259 words
A system for measuring the angle of arrival and the frequency of a radiated wave with respect to a defined line, comprising in combination, a. first and second input terminals for receiving said radiated wave defining points of arrival and said defined line; b. first and second local frequency oscillator means for supplying first and second preset different frequencies separated by a predetermined number of herz in the frequency spectrum; c. first and second mixers receiving said respective first and second inputs from said input terminals and said local oscillator means providing first and second beat frequencies; d. first and second filter means included with said first and second mixers to select as output predetermined frequency components of said beat frequencies; e. a first phase comparator coupled to said first and second mixers providing a first train of pulses separated by a time corresponding to the difference in the local frequencies; f. a second phase comparator coupled to said first and second local oscillators also providing a train of pulses separated by a difference corresponding to the local frequencies, the time separation between corresponding pulses in said two pulse trains being a function of the angle of arrival and the frequency of the incoming wave; and, g. a third phase comparator coupled to said first and second mixers also providing a train of pulses separated by a difference corresponding to the local frequencies, the time separation between the third and second pulse trains being a second function of the angle of arrival and the frequency of the incoming wave.
Claim 3
Dependent Claim
19 words
A system as claimed in claim 1 wherein said first and second local oscillator means use separate local oscillators.
Claim 4
Dependent Claim
50 words
A system as claimed in claim 1 wherein said first and second local oscillator means comprise first and second local oscillators, a balanced modulator fed by said local oscillators, and upper and lower sideband filters separately coupled to the modulator to respectively supply lower and upper frequencies to the mixers.
Claim 5
Dependent Claim
135 words
A system as claimed in claim 1 having two sets of analog-to-digital conversion means, each set including a series of frequency doublers connected to said local oscillators; a series of AND gates with terminals enabled by two inputs, for each of said frequency doublers, one input terminal of which is connected to the corresponding frequency doubler, said terminal acting to unlock the gate at alternate half cycles of the corresponding frequency, the second terminal of one set being connected to the first phase comparator and the second terminal of the other set being connected to the third phase comparator to enable the respective gates of each set when and if the output pulses from said first and third phase comparators coincide in time with an unlocking alternate half cycle acting on the first input terminal.
Claim 6
Dependent Claim
44 words
The system as claimed in claim 4 including phase shifters connected to each of said frequency doublers to shift each frequency to be offset from the next higher and lower frequencies so that together said frequencies are offset to produce a cyclic binary code.
Claim 7
Dependent Claim
67 words
The system as claimed in claim 5 wherein each of said AND gates has a separate output line, sampler means to periodically sample the outputs from these lines, a flip-flop connected to said sampler means said flip-flop being alternately SET and RESET from pulses from the sample lines, and an output side to said flip-flop providing a binary count of the sampled line values in 8-4-2-1 code.