US3747099A
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Polyphase code system
Assignee: Raytheon Co
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Filing: 1970-09-18
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Granted: 1973-07-17
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Expires: 1990-09-18
Abstract
Abstract A system for polyphase encoding transmitted pulses of energy and for decoding the received signals to enhance returns from the range interval being examined during a particular processing period and attenuate returns from contiguous range intervals (pulse compression). The system includes a digital decoding unit, which for an N phase code of length N2, comprises N processing subsections. The subsections are mechanized such that instead of individually phase shifting and adding each of the N2 signals during each decoding sequence, the decoded value of a signal group being processed is formed by modifying and phase shifting only the N subsection output signals from the preceding decoding cycle.
Inventors
- 👤 S Wong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:57
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/10; G01S13/26; G01S13/28; G01S13/284; G01S13/288; H; H04; H04L; H04L27/00; H04L27/18; H04L27/22; H04L27/233; H04L27/2332; H04L27/2338
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
138 words
A device for consecutively decoding groups of sequentially applied encoded signals having N2 signals of N phase encoded states in each group, said device comprising: first means for storing N modified sub-accumulation signals; second means for adjusting the phase of said N modified subaccumulation signals to form N sub-accumulation signals the sum of which approximates the decoded value of a particular group of encoded signals; third means for modifying said N sub-accumulation signals as a function of the difference between saId particular group of encoded signals and the next group, said third means including means for summing the N sub-accumulation signals associated with each group to form signals substantially equal to the decoded value of the corresponding group of encoded signals; and means for updating said first means to store therein said new set of modified sub-accumulation signals.
Claim 2
Independent Claim
138 words
A device for consecutively decoding groups of sequentially applied encoded signals having N2 signals of N phase encoded states in each group, said device comprising: first means for storing N modified sub-accumulation signals; second means for adjusting the phase of said N modified subaccumulation signals to form N sub-accumulation signals the sum of which approximates the decoded value of a particular group of encoded signals; third means for modifying said N sub-accumulation signals as a function of the difference between saId particular group of encoded signals and the next group, said third means including means for summing the N sub-accumulation signals associated with each group to form signals substantially equal to the decoded value of the corresponding group of encoded signals; and means for updating said first means to store therein said new set of modified sub-accumulation signals.
Claim 3
Dependent Claim
55 words
The device of claim 1 further comprising: means for storing the decoded value of a number of consecutively decoded signal groups; means for modifying the value of the some of said stored groups by predetermined constant values; and means for subtracting the modified stored decoded values forom one of the other stored unmodified decoded values.
Claim 4
Independent Claim
146 words
A device for consecutively decoding groups of sequentially applied encoded signals having N2 signals of N phase encoded states in each group, said device comprising: first means for storing N modified sub-accumulation signals; second means for adjusting the phase of said N modified sub-accumulation signals to form N sub-accumulation signals the sum of which approximates the decoded value of a particular group of encoded signals; third means for modifying said N sub-accumulation signals as a function of the difference between said particular group of encoded signals and the next group, said third means including means for adding selected encoded signals to and subtracting different selected encoded signals from each of said N sub-accumulation signals such that each sub-accumulation signal is modified by a different pair of said selected signals; and means for updating said first means to store therein said new set of modified sub-accumulation signals.
Claim 5
Independent Claim
146 words
A device for consecutively decoding groups of sequentially applied encoded signals having N2 signals of N phase encoded states in each group, said device comprising: first means for storing N modified sub-accumulation signals; second means for adjusting the phase of said N modified sub-accumulation signals to form N sub-accumulation signals the sum of which approximates the decoded value of a particular group of encoded signals; third means for modifying said N sub-accumulation signals as a function of the difference between said particular group of encoded signals and the next group, said third means including means for adding selected encoded signals to and subtracting different selected encoded signals from each of said N sub-accumulation signals such that each sub-accumulation signal is modified by a different pair of said selected signals; and means for updating said first means to store therein said new set of modified sub-accumulation signals.
Claim 6
Dependent Claim
51 words
The device of claim 3 wherein said third means further includes means for selecting the encoded signals added to and subtracted from said N sub-accumulation signals such that the signals added to an subtracted from each N sub-accumulation signal are displaced N signal positions in the sequence of encoded applied signals.
Claim 7
Independent Claim
128 words
A device for consecutively decoding groups of sequentially applied encoded signals having N2 signals of N phase encoded states in each group, said device comprising: first means for storing N modified sub-accumulation signals; second means for adjusting the phase of said N modified sub-accumulation signals to form N sub-accumulation signals the sum of which approximates the decoded value of a particular group of encoded signals, said second means including means for forming the vector product between said modified N sub-accumulation signals and N preselected values, respectively; third means for modifying said N sub-accumulation signals as a function of the difference between said particular group of encoded signals and the next group; and means for updating said first means to store therein said new set of modified sub-accumulation signals.
Claim 8
Independent Claim
128 words
A device for consecutively decoding groups of sequentially applied encoded signals having N2 signals of N phase encoded states in each group, said device comprising: first means for storing N modified sub-accumulation signals; second means for adjusting the phase of said N modified sub-accumulation signals to form N sub-accumulation signals the sum of which approximates the decoded value of a particular group of encoded signals, said second means including means for forming the vector product between said modified N sub-accumulation signals and N preselected values, respectively; third means for modifying said N sub-accumulation signals as a function of the difference between said particular group of encoded signals and the next group; and means for updating said first means to store therein said new set of modified sub-accumulation signals.
Claim 9
Dependent Claim
39 words
The device of claim 5 wherein said N modified sub-accumulation signals each have an inphase component and a quadrature component, and said second means includes dual channel multiplication units with each channel having preselected fixed multiplier quantity associated therewith.
Claim 10
Independent Claim
238 words
A device for consecutively decoding groups of sequentially applied encoded signals having N2 signals of N phase encoded states in each group, said device comprising: first means for storing N modified sub-accumulation signals; second means for adjusting the phase of said N modified sub-accumulation signals to form N sub-accumulation signals the sum of which approximates the decoded value of a particular group of encoded signals; third means for modifying said N sub-accumulation signals as a function of the difference between said particular group of encoded signals and the next group, said third means including N delay devices, a subtraction device having minuend and subtrahend inputs and haviNg an output, means for applying said sequentially applied encoded signals to the minuend input of said subtraction device and to the input of a first one of said N delay lines, means for coupling the output of said first delay device to the subtrahend input of said subtraction device, means for coupling the output of said subtraction device to a second one of said N delay devices, means for coupling the second through the Nth said delay devices in series, and means for summing the N sub-accumulation signals from said second means with the output signal of said subtraction device and with said output signals of the second through said Nth delay devices, respectively; and means for updating said first means to store therein said new set of modified sub-accumulation signals.
Claim 11
Independent Claim
238 words
A device for consecutively decoding groups of sequentially applied encoded signals having N2 signals of N phase encoded states in each group, said device comprising: first means for storing N modified sub-accumulation signals; second means for adjusting the phase of said N modified sub-accumulation signals to form N sub-accumulation signals the sum of which approximates the decoded value of a particular group of encoded signals; third means for modifying said N sub-accumulation signals as a function of the difference between said particular group of encoded signals and the next group, said third means including N delay devices, a subtraction device having minuend and subtrahend inputs and haviNg an output, means for applying said sequentially applied encoded signals to the minuend input of said subtraction device and to the input of a first one of said N delay lines, means for coupling the output of said first delay device to the subtrahend input of said subtraction device, means for coupling the output of said subtraction device to a second one of said N delay devices, means for coupling the second through the Nth said delay devices in series, and means for summing the N sub-accumulation signals from said second means with the output signal of said subtraction device and with said output signals of the second through said Nth delay devices, respectively; and means for updating said first means to store therein said new set of modified sub-accumulation signals.
Claim 12
Dependent Claim
16 words
The device of claim 7 wherein each said delay device includes an N stage shift register.
Claim 13
Dependent Claim
22 words
The device of claim 7 wherein said N delay devices comprise an N2 stage shift register with output terminals every N stage.
Claim 14
Dependent Claim
39 words
The device of claim 7 wherein each said sequentially applied encoded signal has an inphase component and a quadrature component and each said delay device includes a separate N stage shift register for the inphase and quadrature components, respectively.
Claim 15
Dependent Claim
27 words
The device of claim 10 wherein said subtraction device and said means for summing each includes separate processing channels for both the inphase and the quadrature components.
Claim 16
Independent Claim
239 words
A device for consecutively decoding groups of sequentially applied encoded signals having N2 signals of N phase encoded states in each group, wherein a group t + 1 of said encoded signals differs from a preceding group t by the absence of a signal S0 at one end of the t group and the addition of a new signal Sn to the other end of the t group, said device comprising: first means for storing N modified sub-accumulation signals; second means for adjusting the phase of said N modified sub-accumulation signals to form N sub-accumulation signals the sum of which approximates the decoded value of a particular group of encoded signals; third means for modifying said N sub-accumulation signals as a function of the difference between said particular groups of encoded signals and the next group, said third means includes means for modifying each sub-accumulation signal associated with group t as follows: add (-S0 + SN) to u0,t add (-Sn +S2N) to u1,t add (-S2N + S3N) to u2,t . . . add (-S(N 1)N + SN ) to uN 1,t; where said N sub-accumulation signals associated with group t are designated u0,t; u1,t; u2, t; . . . uN 1,t; and said signals comprising said encoded group at time t + 1 are designated S1, S2, S3 . . . SN , means for updating said first means to store therein said new set of modified sub-accumulation signals.
Claim 17
Independent Claim
239 words
A device for consecutively decoding groups of sequentially applied encoded signals having N2 signals of N phase encoded states in each group, wherein a group t + 1 of said encoded signals differs from a preceding group t by the absence of a signal S0 at one end of the t group and the addition of a new signal Sn to the other end of the t group, said device comprising: first means for storing N modified sub-accumulation signals; second means for adjusting the phase of said N modified sub-accumulation signals to form N sub-accumulation signals the sum of which approximates the decoded value of a particular group of encoded signals; third means for modifying said N sub-accumulation signals as a function of the difference between said particular groups of encoded signals and the next group, said third means includes means for modifying each sub-accumulation signal associated with group t as follows: add (-S0 + SN) to u0,t add (-Sn +S2N) to u1,t add (-S2N + S3N) to u2,t . . . add (-S(N 1)N + SN ) to uN 1,t; where said N sub-accumulation signals associated with group t are designated u0,t; u1,t; u2, t; . . . uN 1,t; and said signals comprising said encoded group at time t + 1 are designated S1, S2, S3 . . . SN , means for updating said first means to store therein said new set of modified sub-accumulation signals.
Claim 18
Dependent Claim
85 words
The device of claim 12 wherein said second means includes means for phase rotating said modified sub-accumulation signals by the following indicated quantity; (u0,t -S0 + Sn) by exp-0(j 2 pi /N) (u1,t -SN + S2N) by exp-1(j 2 pi /N) (u2,t -S2N + S3N) by exp-2(j 2 pi /N) . . . (uN 1,t - S(N 1)N + SN ) by expo-(N-1) (j 2 pi /N) where the notation ''''exp'''' indicates the constant epsilon raised to the power of the expression following said notation.
Claim 19
Independent Claim
158 words
A method for consecutively decoding groups of sequentially applied signals having N2 signals of N phase encoded stated in each grOup, with each group differing from the preceding group by the addition of a new encoded signal to one end of the group and the deletion of a signal from the other end of the group, said method comprising the steps of: storing N modified sub-accumulation signals from the last preceding processing cycle; adjusting the phase of said N modified sub-accumulation signals to form N sub-accumulation signals the sum of which approximates the decoded value of a particular group of encoded signals; summing the N sub-accumulation signals associated with each group to form signals substantially equal to the decoded value of the corresponding group of encoded signals; modifying said N sub-accumulation signals as a function of the difference between said particular group of encoded signals and the next group; and storing said new set of modified sub-accumulation signals.
Claim 20
Independent Claim
158 words
A method for consecutively decoding groups of sequentially applied signals having N2 signals of N phase encoded stated in each grOup, with each group differing from the preceding group by the addition of a new encoded signal to one end of the group and the deletion of a signal from the other end of the group, said method comprising the steps of: storing N modified sub-accumulation signals from the last preceding processing cycle; adjusting the phase of said N modified sub-accumulation signals to form N sub-accumulation signals the sum of which approximates the decoded value of a particular group of encoded signals; summing the N sub-accumulation signals associated with each group to form signals substantially equal to the decoded value of the corresponding group of encoded signals; modifying said N sub-accumulation signals as a function of the difference between said particular group of encoded signals and the next group; and storing said new set of modified sub-accumulation signals.
Claim 21
Independent Claim
170 words
A method for consecutively decoding groups of sequentially applied signals having N2 signals of N phase encoded states in each group, with each group differing from the preceding group by the addition of a new encoded signal to one end of the group and the deletion of a signal from the other end of the group, said method comprising the steps of: storing N modified sub-accumulation signals from the last preceding processing cycle; adjusting the phase of said N modified sub-accumulation signals to form N sub-accumulation signals the sum of which approximates the decoded value of a particular group of encoded signals; modifying said N sub-accumulation signals as a function of the difference between said particular group of encoded signals and the next group, with said modifying step including adding selected encoded signals to and subtracting different selected signals from each of said N sub-accumulation signals such that each sub-accumulation signal is modified by a different pair of said selected signals; and storing said new set of modified sub-accumulation signals.
Claim 22
Independent Claim
170 words
A method for consecutively decoding groups of sequentially applied signals having N2 signals of N phase encoded states in each group, with each group differing from the preceding group by the addition of a new encoded signal to one end of the group and the deletion of a signal from the other end of the group, said method comprising the steps of: storing N modified sub-accumulation signals from the last preceding processing cycle; adjusting the phase of said N modified sub-accumulation signals to form N sub-accumulation signals the sum of which approximates the decoded value of a particular group of encoded signals; modifying said N sub-accumulation signals as a function of the difference between said particular group of encoded signals and the next group, with said modifying step including adding selected encoded signals to and subtracting different selected signals from each of said N sub-accumulation signals such that each sub-accumulation signal is modified by a different pair of said selected signals; and storing said new set of modified sub-accumulation signals.
Claim 23
Dependent Claim
48 words
The method of claim 15 wherein said modifying step further includes selecting the encoded signals added to and subtracted from said N sub-accumulation signals such that the signals added and subtracted from each N sub-accumulation signal are displaced N signal positions in the sequence of encoded applied signals.
Claim 24
Independent Claim
154 words
A method for consecutively decoding groups of sequentially applied signals having N2 signals of N phase encoded states in each group, with each group differing from the preceding group by the addition of a new encoded signal to one end of the group and the deletion of a signal from the other end of the group, said method comprising the steps of: storing N modified sub-accumulation signals from thel last preceding processing cycle; adjusting the phase of said N modified sub-accumulation signals to form N sub-accumulation signals the sum of which approximates the decoded value of a particular group of encoded signals, with said phase adjusting step including forming the vector product between said modified N sub-accumulation signals and N preselected values, respectively; modifying said N sub-accumulation signals as a function of the difference between said particular group of encoded signals and the next group; and storing said new set of modified sub-accumulation signals.
Claim 25
Independent Claim
154 words
A method for consecutively decoding groups of sequentially applied signals having N2 signals of N phase encoded states in each group, with each group differing from the preceding group by the addition of a new encoded signal to one end of the group and the deletion of a signal from the other end of the group, said method comprising the steps of: storing N modified sub-accumulation signals from thel last preceding processing cycle; adjusting the phase of said N modified sub-accumulation signals to form N sub-accumulation signals the sum of which approximates the decoded value of a particular group of encoded signals, with said phase adjusting step including forming the vector product between said modified N sub-accumulation signals and N preselected values, respectively; modifying said N sub-accumulation signals as a function of the difference between said particular group of encoded signals and the next group; and storing said new set of modified sub-accumulation signals.
Claim 26
Independent Claim
144 words
A device for consecutively decoding groups of sequentially applied phase encoded signals, said device comprising; means for storing a plurality of sub-accumulation signals the sum of which approximates the decoded value of a particular group of said encoded signal; means for modifying said plurality of stored sub-accumulation signals as a function of the difference between said particular group of encoded signals and the next group to form a plurality of new sub-accumulation signals with said means for modifying including means for adding a signal to and subtracting a signal from each of said stored signals to Provide a plurality of modified sub-accumulation signals, and means for adjusting the phase of each of said modified sub-accumulation signals as a function of phase encoded onto said sequentially applied phase encoded signals; and means for applying said new set of sub-accumulation signals to said means for storing.
Claim 27
Independent Claim
144 words
A device for consecutively decoding groups of sequentially applied phase encoded signals, said device comprising; means for storing a plurality of sub-accumulation signals the sum of which approximates the decoded value of a particular group of said encoded signal; means for modifying said plurality of stored sub-accumulation signals as a function of the difference between said particular group of encoded signals and the next group to form a plurality of new sub-accumulation signals with said means for modifying including means for adding a signal to and subtracting a signal from each of said stored signals to Provide a plurality of modified sub-accumulation signals, and means for adjusting the phase of each of said modified sub-accumulation signals as a function of phase encoded onto said sequentially applied phase encoded signals; and means for applying said new set of sub-accumulation signals to said means for storing.
Claim 28
Dependent Claim
92 words
A pulse compression system comprising: means for transmitting phase encoded pulses of energy; means for receiving energy reflected in response to said transmitted encoded pulses, means for sequentially processing said received energy to form a pluraltiy of sub-accumulation signals the sum of which approximates the compressed value of the received energy from a particular range interval and means for modifying said plurality of accumulation signals associated with said particular range interval to form another set of sub-accumulation signals the sum of which approximates the reflected energy received from the next range interval.
Claim 29
Dependent Claim
92 words
A pulse compression system comprising: means for transmitting phase encoded pulses of energy; means for receiving energy reflected in response to said transmitted encoded pulses, means for sequentially processing said received energy to form a pluraltiy of sub-accumulation signals the sum of which approximates the compressed value of the received energy from a particular range interval and means for modifying said plurality of accumulation signals associated with said particular range interval to form another set of sub-accumulation signals the sum of which approximates the reflected energy received from the next range interval.
Claim 30
Dependent Claim
63 words
The system of claim 19 wherein: said transmitting means includes means for encoding N phase states onto each transmitted signal; said processing means includes storage means for storing N sub-accumulation signals; and said modifying means includes means for modifying each said stored signal as a function of the difference between said signals associated with a particular range interval and the next range interval.
Claim 31
Dependent Claim
53 words
The device of claim 20 wherein said modifying means includes means for adding a signal to and subtracting a signal from each of said stored signals to provide N modified sub-accumulation signals, and means for adjusting the phase of each of said modified sub-accumulation signals as a function of said encoded phase states.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |