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Ploughshare Patents. Tom Stansell [email protected]. Background. With a priority date of 9/1/2003, European patent EP 183019981 was awarded to Tony Pratt and John Owen on 2/1/2012 - PowerPoint PPT Presentation
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Background¨ With a priority date of 9/1/2003, European patent EP 183019981 was
awarded to Tony Pratt and John Owen on 2/1/2012 · The patent is valid in: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT
LI LU MC NL PL PT RO SE SI SK TR (28 Countries)· “Note: Within nine months of the publication of the mention of the grant of the
European patent in the European Patent Bulletin, any person may give notice to the European Patent Office of opposition to that patent, in accordance with the Implementing Regulations” (< 4 months to go?)
· Similar patents have been filed in the US and other countries¨ The patent is assigned to: “Proprietor: Secretary of State for Defence,
Porton Down, Salisbury, Wiltshire SP4 OJQ (GB)” ¨ “*Ploughshare Innovations” has contacted several US GPS companies
about licensing this technology· *Ploughshare Innovations Ltd was incorporated in 2005 as a wholly owned
subsidiary of Dstl, the MoD’s research and development division. Company Number 04401901
¨ This patent aims directly at use of the GPS III L1C signal
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Patent Cover
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Ploughshare
Brochure
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InsideGNSS Ploughshare Patent ListBy permission of InsideGNSS
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Summary of L1C Advantages¨ Overcomes multiple deficiencies of C/A signal¨ More interoperable with Galileo E1 OS¨ Satisfies US/EU Agreement¨ Will be on all GPS III satellites¨ Significant performance improvements:
· Code and carrier tracking threshold· Code correlation, interference Protection· Time to first fix· Data demodulation down to tracking threshold· Lower code tracking noise· Less multipath interference
L1C is a valuable
and important new signal
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Value-Ordered Innovations (Stansell’s Opinion)
1. 75% of power in the pilot Stansell (Betz)
2. Low density parity check (LDPC) FEC· Ma, Shane, Sklar, Wang, Kasemsri, Zapanta
3. CNAV-2 message structure Kovach (Stansell)4. TOI with BCH encoding Kovach & Cahn5. Pilot overlay code frames message and improves
correlation properties Cahn6. The spreading and overlay code designs
Rushanan7. The MBOC (TMBOC) waveform Betz8. Symbol interleaving Dafesh, Sklar, Wang
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Common Spectral CharacteristicsThese systems have selected two common center frequencies and essentially equivalent
power spectral densities (PSD)
Plot span is ±20 MHZ about center frequency
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L1C MBOC Spectrum
-95
-90
-85
-80
-75
-70
-65
-60
-20 -15 -10 -5 0 5 10 15 20
Pow
er S
pect
ral D
ensi
ty (d
BW
/Hz)
Offset from Center Frequency (MHz)
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Linear Scale L1C PSD
0.0
0.1
0.2
0.3
0.4
0.5
0.6
-20 -15 -10 -5 0 5 10 15 20
Offset from Center Frequency (MHz)
Pow
er S
pect
ral D
ensi
ty (W
/Hz) BOC(1,1)
MBOC
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10. A receiver comprising means to process a navigation signal as claimed in claim 9.
9. A navigation signal comprising a ranging signal modulated by a subcarrier modulation signal as claimed in either of claims 7 and 8.
7. A subcarrier modulation signal for modulating a ranging signal of a navigation system, the subcarrier modulation signal comprising time domain multiplexed portions of first and second Binary Offset Carrier, BOC, signals to produce the subcarrier modulation signal wherein the subcarrier modulation signal is adapted to modulate the ranging signal.
Receiver-Relevant Patent Claims
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GPS TMBOC Version of MBOC0 1 0 0 1 01 1 1 0 0 0 1 0 0 1 01 1 1 0 0 0 1 0 0 1 01 1 1 0 0
GPS TMBOC = 4 BOC(6,1) chips out of every 33 chips
BOC(1,1) Chip BOC(6,1) Chip
489 ns 81.5 ns
On pilot carrier onlywith 75% of total power
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Questions?
