Intro to GNSS & Teseo-LIV3F Module for IoT Positioning

Transcription

1 Intro to GNSS & Teseo-LIV3F Module for IoT Positioning

2 Agenda 2 Presentation Speaker GPS Signal Overview GNSS Constellations Mike Slade Teseo3 Chipset Overview Multi-Constellation Benefit Teseo-LIV3F Module Overview Performance & Features Advanced Features Tools

3 GPS Signal Overview

4 GPS L1 & L2 Signal Generation 4

5 GPS L1 Signal Model 5 L1 i( t) = Di ( t) PYi( t)cos( ω t) + 2Di( t) CAi( t)sin( ω1 1 t ) D i (t) Data modulation of 50 bit per second Navigation Message CA i (t) Mchip/sec Pseudo Random Noise (PRN) Modulation unique Gold Code Sequence 1023 chip / 1 millisecond cycle Noise Floor Desired Signal PY i (t) Mchip/sec PRN Modulation unique Long Secure Code Sequence ω 1 GPS L1 Carrier Frequency MHz Phase Transitions Due to PRN * Data Modulation 1 C/A code chip = 1/ MHz = 1540 L-band Carrier Cycles

6 PRN Correlation 6 Sat PRN T Rcv PRN Rcv PRN Rcv PRN -T 0 T F.Henkel Shifting reciever generated PRN code to find a satellite is part of the aquisition process

7 Satellite Signal Strength km L1 min Watt (21.9 Watt for C/A code) min dbm (21.9 * Watt) -150dBm Carrier/Noise (19dB-Hz) -160dBm C/N0-170dBm -174dBm Absolute Noise (Background Noise) Noise C/N(dB-Hz) = 10*log 10 P carrier P noise CN0 = referenced to 1 Hz bandwidth dbm = referenced to 1 milliwatt

8 GNSS Constellations

9 GNSS Satellite Signals 9 GPS GLONASS Galileo Beidou II BOC = Binary Offset Carrier BPSK = Binary Phase Shift Keyed

10 Satellite Based Augmentation Systems (SBAS) 10 SBAS Benefits: Accuracy Provide wide area corrections (Ionospheric, GPS satellite timing & orbit) for reducing GNSS ranging errors Integrity Fast detection & indication to recievers when satellite signal errors occur Availability If ranging signal is transmitted from SBAS satellite

11 Teseo3 Chipset Overview

12 What is Teseo? 12 Galileo GLONASS QZSS Emergency Call Drones Fleet Management Insurance GPS Beidou2 Road Tolling Diagnostics Anti-theft People MultiConstellation GNSS Vehicle Sharing PET Public Transportation Goods Numerous Applications

13 MJS4 Teseo3 Chipset Architecture 13

14 Slide 13 MJS4 Michael J SLADE, 8/21/2017

15 Multi-Constellation Benefit

16 Simultaneous Multi-Constellation Benefit 15 More satellites Higher availability Better accuracy Constellation GPS GPS+Glonass Visible Satellite* No Fix 380 min Never HDOP* Accuracy* x meter (x * 0.4) meter *Average Value (24hrs)

17 GPS+Glonass Chicago 16 GPS GPS+GLO TRUTH GPS GPS+GLO TRUTH London GPS Competitor GPS+GLO Dallas

18 GPS+Galileo Simulator ideal full sky scenario 17 Real sky scenario with the 4 Galileo Sats CEP Fix error >15% position accuracy improvement

19 GPS+Beidou 18 MEO / IGSO Satellites GEO Satellites Teseo III Log BD2 System Status 6 Op GEOs 6 Op / 2 Non-Op IGSOs(55deg) 3 Op /11 Non-Op MEOs

20 Teseo-LIV3F Overview

21 Teseo-LIV3F Module 20 Best In Class Precision Geofencing Multi Constellation Odometer Assisted GNSS Datalogging Low Power Modes FW Upgrade & Configuration

22 Where does LIV3F fit? 21 Drones Fleet Management Insurance Diagnostics Anti-theft People PET Public Transportation LIV3F fit Goods OEM Automotive Wearables High Precision LIV3F not a fit

23 Module Architecture 22

24 Basic Design 23 Main PS VBAT VCC TCXO 2MB SQI Flash TESEO-LIV3F RF in 1PPS SAW Filter (opt) LNA (opt) UART RX/TX RS232 Phy UART Conn.

25 Teseo-LIV3F Performance & Features

26 GNSS Performance 25 Condition GPS & GLONASS GPS & BeiDou GPS & Galileo Time To First Fix (sec) Cold start < 32 < 36 < 30 Warm start < 25 < 29 < 26 Hot start < 1.5 < 2.5 < 2 Velocity (m/s) Accuracy (CEP 50%) Heading (deg) Horizontal position with AGNSS (m) Horizontal position with SBAS (m) < 1.8 < < Sensitivity (dbm) Tracking Navigation Reacquisition

27 Standard Applications 26 Datalogging saves lat/lon to flash for retrieval by host Geofencing notifies when lat/lon is close to a defined circle Odometer computes distance travelled from position & velocity data Up to 12h data logging (1Hz) Logged data-fields configurable Memory full alarm Up to 8 configurable circles Crossing fence alarm Up to 3 TRIP counters Distance achieved alarm

28 Assistance Methods 27 Self Trained Predicted Real Time ST-AGNSS predicts satellite data based on previous observation of satellite broadcast data P-AGNSS predicts satellite data based on data downloaded by an assistance server RT-AGNSS uses real-time satellite data downloaded by an assistance server Internet NOT needed 6-day prediction Internet NEEDED (8kB data per download) 14-day prediction Internet NEEDED (6kB data every 2hrs) Continuous/RealTime TTFF ~1-4sec TTFF ~1-4sec TTFF ~1sec

29 Alternate Power Modes 28 Adaptive Duty Cycle Periodic Apps requiring specific accuracy GLONASS RF off when under EHPE threshold 1 -> 5 sec per PVT output GNSS RF & BB off 70% of every sec 5sec -> 18hr per PVT output in Standby mode or OFF when not active GPS + GLONASS EHPE threshold configurable GPS + GLONASS Auto EPH update & continuous mode detect GPS only Lowest Average Power Option

30 Teseo-LIV3F Advanced Features

31 Precise Timing 30 TEST Setup Reference time Operation Mode GPS Time GPS Only Timing Constellation Mask 0 PPS Accuracy -CDF SIMULATOR environment GPS Time as reference, GPS only mode, Timing Mask set to 0 Error [ns] PPS error (50%) 3.8 PPS error (90%) 7.4 PPS error (99%) 9.7 PPS error (100%) 12.5

32 Teseo-LIV3F Tools

33 X-Nucleo-GNSS1A1 For development on STM32 based design Includes: X-CUBE-GNSS1 expansion package for STM32Cube Protocols: NMEA Interfaces: 1 UART 1 DDC (I2C compliant) Digital I/O configurable timepulse 1 EXTINT input for Wakeup Boards 32 EVB-LIV3F For evaluation of LIV3F GNSS solution Protocols: NMEA Interfaces: 1 UART 1 DDC (I2C compliant)

34 View/Record/Playback NMEA & DEBUG Teseo Suite Lite 33 View Graphics charts o Position o CN0 o Sky view o Map view Send Commands Dedicated panels: o Assisted GPS o FW configurator TEST plan Embedded TOOLs: o FW Upgrade

35 Technical Documentation Datasheet Hardware User Manual Software User Manual Eval board data brief Firmware updates Schematics, Gerber and PCB Example C-Code

36 Thank you! Q&A