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SE880 Cold Start TTFF vs. Signal Strength

SE880 Cold Start TTFF vs. Signal Strength. TTFF [s]. J-Air @ -148dBm. ▲ TTFF @ +85ºC ♦ TTFF @ 25ºC ■ TTFF @ -40ºC. @ -147dBm, P(TTFF≤ 300 s) = 90% across temp. Very Weak. @ -143dBm, P(TTFF≤ 100s) = 99.73% across temp. Weak. @ ≥ -137dBm, P( TTFF ≤36s) = 90% across temp.

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SE880 Cold Start TTFF vs. Signal Strength

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  1. SE880 Cold Start TTFF vs. Signal Strength TTFF [s] J-Air @ -148dBm ▲ TTFF @ +85ºC ♦ TTFF @ 25ºC ■ TTFF @ -40ºC @ -147dBm, P(TTFF≤ 300 s) = 90% across temp. Very Weak @ -143dBm, P(TTFF≤ 100s) = 99.73% across temp. Weak @ ≥ -137dBm, P( TTFF ≤36s) = 90% across temp. Nominal ------- Strong CGPS

  2. B. Production Parts Characterization SE880 Performance Statistic Overview

  3. Improved Navigation Stability and TTFF at Weak SignalsCold Start at C/No @ 22dB-Hz (-148.3 ~ -148.7 dBm) SE880 J-Air -148.3 dBm -148.7 dBm Mean 600s • Traditional Technology at -148dBm • Not stable at -148dBm • Spec- sensitivity not achieving @ -148dBm

  4. SE880 Improved Filter Transfer Function SE880 Traditional Technology 2.45GHz Deepest attenuation pole at the most crowded 2.45GHz spectrum

  5. Improved Performance Stability Across TemperatureSE880 Acquisition Sensitivity & TTFF @ -40ºC C/No C/No @ -40ºC NF improved 0.7dB @ -40ºC Cold Start TTFF C/No @ 25ºC TTFF @ 25ºC Significant TTFF improvement @ - 40ºC TTFF @ -40ºC - - - - - - AGC significantly decreased 9.8 dB (implied S/N greatly improved, dNF/dTemp dominated) AGC Decreases AGC @ -40ºC AGC @ 25ºC

  6. Improved Performance Stability Across TemperatureSE880 Acquisition Sensitivity & TTFF @ 85ºC C/No Cold Start TTFF C/No @ 25ºC C/No @ 85ºC NF increased 0.3 dB only TTFF @ 85ºC Maintained Fast TTFF @ 85ºC TTFF @ 25ºC AGC slightly decreased 4.2 dB, (implied both Gain and NF increased; dG/dTemp and dNF/dTemp) AGC @ 85ºC AGC @ 25ºC

  7. SE880 Drive Test Under Jamming • Passive Antenna • Inside and under the windshield • In-band jamming caused by: • Radio • LCD • Meter • Printer In-band Jammers

  8. SE880 Drive Test under Tokyo Express • under the bridge Tokyo Express

  9. Jupiter SE880 Drive Test in Tokyo Downtown

  10. SE880 Tokyo In-door Location Fix (Cold Start)!Average C/No at 22dB-Hz !!

  11. SE880 Drive Test in Hong Kong Urban Canyon !

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