US3662386A — Programmable 20-bit pseudorandom (prf) generator

Claim 1

Independent Claim 202 words

A programmable pseudorandom pulse repetition frequency (PRF) generator capable of outputting a pulse having various combinations of PRF and jitter percent comprising: program selector means for selecting particular combinations of frequency and jitter percent; frequency producing means for generating a constant output frequency; code comparison means operatively connected to said program selector means for comparing the selected combination of frequency and jitter percent against a permitted combination of frequency and jitter percent and outputting an enable signal when a permitted combination has Been selected; frequency divider means operatively connected to said code comparison means and said frequency producing means and receiving a digital word determinative of a divisor, an enable signal and a constant output frequency from the code comparison means and frequency producing means respectively and dividing said frequency in accordance with said digital word to produce an average frequency FA; pseudorandom generator means operatively connected to said code comparison means and said frequency divider means and receiving signals corresponding to permitted jitter percent and FA, respectively, and generating an output pulse which is jittered in accordance with the jitter percent such that the average frequency of the jittered pulse is the same as the average frequency of the unjittered pulse.

Claim 2

Dependent Claim 202 words

A programmable pseudorandom pulse repetition frequency (PRF) generator capable of outputting a pulse having various combinations of PRF and jitter percent comprising: program selector means for selecting particular combinations of frequency and jitter percent; frequency producing means for generating a constant output frequency; code comparison means operatively connected to said program selector means for comparing the selected combination of frequency and jitter percent against a permitted combination of frequency and jitter percent and outputting an enable signal when a permitted combination has Been selected; frequency divider means operatively connected to said code comparison means and said frequency producing means and receiving a digital word determinative of a divisor, an enable signal and a constant output frequency from the code comparison means and frequency producing means respectively and dividing said frequency in accordance with said digital word to produce an average frequency FA; pseudorandom generator means operatively connected to said code comparison means and said frequency divider means and receiving signals corresponding to permitted jitter percent and FA, respectively, and generating an output pulse which is jittered in accordance with the jitter percent such that the average frequency of the jittered pulse is the same as the average frequency of the unjittered pulse.

Claim 3

Dependent Claim 30 words

A programmable pseudorandom pulse repetition frequency generator as set forth in claim 1 wherein; said code comparison means comprises a logic matrix for screening the preset code for unwanted codes.

Claim 4

Dependent Claim 87 words

A programmable pseudorandom pulse repetition frequency generator as set forth in claim 1 wherein; said frequency divider means includes code storage means for receiving and storing the code selected by the program selector means; and further including pattern generator means for generating a pseudorandom sequence of five digit binary numbers, said pattern generator outputting a desired devisor Y; said comparison means operatively receiving the program code from the code storage subfunction and the digit from the pattern generator subfunction for comparing them and producing an output pulse.

Claim 5

Dependent Claim 98 words

A programmable pseudorandom pulse repetition frequency generator as set forth in claim 1 including; jitter percent select means for generating an output corresponding to the selected jitter percent included in said program selector means; P register means included in said pseudorandom generator means for producing a random count; an R register means included in said pseudorandom generator means for generating a pseudorandomly varying count which is connected from the stages of the R register to the stages of the P register to generate the jitter pulse to jitter on the output pulse of the pulse repetition frequency generator.

Claim 6

Dependent Claim 58 words

A programmable pseudorandom pulse repetition frequency generator as set forth in claim 1 and further including; delay counter means operatively receiving the output pulse from the pseudorandom generator means and clock pulses from the frequency producing means and in turn producing output pulses corresponding to the radar trigger pulse and other pulses adapted for use with multitrack radar.

Claim 7

Dependent Claim 51 words

A programmable pseudorandom pulse repetition frequency generator as set forth in claim 1 and further including; commutator means operatively connected to said program selector means and receiving inputs therefrom and having an output connected to said code screening means and functioning to route the selected program to the code screening means.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1975-05-09	1975-11-08	1976-05-09	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1979-05-09	1979-11-08	1980-05-09	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1983-05-09	1983-11-08	1984-05-09	$7700.00	Window Closed / Lapsed

Programmable 20-bit pseudorandom (prf) generator

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