Presentation Slides

Report
Ploughshare Patents
Tom Stansell
[email protected]
Stansell
Consulting
RL
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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RL
Slide 2
Patent Cover
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Slide 3
Ploughshare
Brochure
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Slide 4
InsideGNSS Ploughshare Patent List
By permission
of InsideGNSS
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Slide 5
Summary of L1C Advantages
Overcomes multiple deficiencies of C/A signal
More interoperable with Galileo E1 OS
Satisfies US/EU Agreement
L1C is a
valuable
Will be on all GPS III satellites
and
Significant performance improvements: important






new signal
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
Stansell
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Slide 6
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 & Cahn
5. Pilot overlay code frames message and improves
correlation properties
Cahn
6. The spreading and overlay code designs Rushanan
7. The MBOC (TMBOC) waveform Betz
8. Symbol interleaving Dafesh, Sklar, Wang
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Slide 7
Common Spectral Characteristics
These 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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Slide 8
Power Spectral Density (dBW/Hz)
L1C MBOC Spectrum
-60
-65
-70
-75
-80
-85
-90
-95
-20
-15
-10
-5
0
5
10
15
Offset from Center Frequency (MHz)
20
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Slide 9
Power Spectral Density (W/Hz)
Linear Scale L1C PSD
0.6
BOC(1,1)
0.5
0.4
0.3
0.2
MBOC
0.1
0.0
-20
-15
-10
-5
0
5
10
Offset from Center Frequency (MHz)
15
20
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Slide 10
Receiver-Relevant Patent Claims
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.
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Slide 11
GPS TMBOC Version of MBOC
1
1
1
0
0
0
1
0
0
1
0
1
1
1
0
0
0
1
0
0
1
0
1
1
1
0
0
0
1
0
0
1
0
GPS TMBOC = 4 BOC(6,1) chips out of every 33 chips
On pilot carrier only
with 75% of total power
BOC(1,1) Chip
489 ns
BOC(6,1) Chip
81.5 ns
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Slide 12
Questions?
Stansell
Consulting
RL
Slide 13

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