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i-Lotus RX Oncore, User Manual

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i-Lotus RX Oncore User Manual Download Page 36

 

Document Number: 403 

– GPS – 070 

 

Page | 32  

15  Hardware Recommendations 

15.1 

Oncore Silver GPS Active Antenna 

Oncore Silver GPS Active antenna is the qualified and recommended GPS active antenna for use with the RX Oncore 
receiver. 

The small footprint, low profile package and the shielded LNA (low noise amplifier) offer significantly enhanced 
performance while operating in a variety of GPS environments. Furthermore, magnetic and blind-hole direct 
mounting options and waterproof shell make the antenna suitable for a number of different installation 
configurations. 

 

 

Fig 15.1    

GPS Active Antenna 

 

 

 

 

 

 

Summary of Contents for RX Oncore

Page 1: ......

Page 2: ...us Corporation Pte Ltd All rights reserved No part of this publication may be reproduced altered transmitted stored in a retrieval system or translated into any other language by any means without written consent of i Lotus is a registered trademark of i Lotus Corporation Pte Ltd and i Lotus International Pte Ltd 2008 i Lotus Pte Ltd Printed in Singapore If you require any assistance or have any q...

Page 3: ...Module Information 8 3 7 Satellite Based Augmentation System SBAS 8 3 8 NMEA Protocol Support 8 4 Module Pin Layout 9 5 Pin Definition 10 6 Mechanical Dimensions 12 7 Packaging Detail 13 8 Electrical Specifications 14 8 1 VCC 14 8 2 VBATT 15 9 Antenna circuitry 16 9 1 GPS Antenna detection 17 10 SBAS 18 10 1 Available SBAS Satellites 19 10 2 Supported commands 20 10 3 Effectiveness 20 11 Module In...

Page 4: ...Plastic Reel Detail 26 13 Handling Shipment Storage 27 13 1 Handling 27 13 2 Shipment 28 13 3 Storage 30 14 Reference Design 31 15 Hardware Recommendations 32 15 1 Oncore Silver GPS Active Antenna 32 15 2 Technical Specifications 33 15 3 Block Diagram 34 15 4 Antenna Gain Pattern 35 15 5 Mechanical Dimensions 37 15 6 Antenna Placement 37 16 Ordering Information 38 ...

Page 5: ...ability and easy integration are paramount Extending the intelligence quality and market impact our current technological advances have on the industry the RX Oncore uniquely defines a balance between high performance and cost effectiveness in the development of this complete and vastly flexible GPS receiver 1 2 Key Features Fig 1 1 RX Oncore module Miniature Size 17 0 x 22 4 x 3 0mm 1 Low Power C...

Page 6: ...Mode Cold Start 32 0 s Warm Start 21 0 s Hot Start 1 5 s Accuracy Autonomous Mode Horizontal Position Error at 50 probable 2 5 m 1 sigma 2 0 m SBAS Altitude 1 500 m to 18 000 m Velocity 515 m sec Sensitivity Acquisition 146 dBm Tracking 159 dBm Max Update Rate 4 Hz 1PPS Timing Not Supported Electrical Characteristics Main Power Supply Vcc Voltage Range 3 0 to 3 6 VDC Nominal 3 3 VDC Power Consumpt...

Page 7: ... height velocity heading time NMEA 0183 GGA GLL GSA GSV RMC VTG ZDA Commands Supported STM NMEA i Lotus NMEA Environmental Characteristics Operating Temperature 40 to 85 C Storage Temperature 40 to 105 C Humidity Moisture Humidity RH 1 25g m3 ROHS compliant Yes RTC 32 768KHz RTC Internal Standard Features NMEA Output Auto NMEA output up to 1Hz Setup Configuration Saved to flash non volatile memory...

Page 8: ...diagram of the RX Oncore receiver LNA RFIN ANTDET TCXO RF Circuitry Clock Generator SPI Bus RF Front End SAW Filter RF Gnd RX Oncore Module Antenna Protection Sensing Circuitry Antenna Sensing Circuit Fault VANT ANTDET VANT Digital Gnd Antenna LNA Active Antenna Fig 3 1 Functional Block Diagram ...

Page 9: ...aseband BiCMOS Sige for Radio Front end 40 o C to 85 o C Operating temperature range SBAS WAAS and EGNOS supported Power Supply 3 0V to 3 6V operating supply range for Input output periphery 3 0V to 3 6V operating supply range for A D Converter reference 1 8V operating supply range for core supply provided by internal Voltage Regulator 2 7V operating supply range for RF Front end section Reset and...

Page 10: ...S L1 signal VGA Gain internally regulated On chip programmable PLL 3 3 Hardware Interface Overview The RX Oncore GPS module uses the STA8058 fully embedded GPS engine core chip set This chipset features 64KB RAM and 256 KB 16 KB Flash Memory in a single chip BGA package The GPS IC contains a 66 MHz ARM7TDMI 32 bit processor The RX Oncore uses an internal frequency synthesizer to create all interna...

Page 11: ...and Standby Mode by pulling the hardware control on the WAKEUP pin When the RX Oncore is in Full Power Mode it can be set to Standby Mode by pulling the hardware control on the WAKEUP pin LOW When the RX Oncore is in Standby Mode it can be restored to Full Power Mode by pulling the hardware control on the WAKEUP pin HIGH 3 5 GPS Antenna detection To support active GPS antenna 5V VANT connected to ...

Page 12: ... 178 0 East In EGNOS system region Europe and Africa d 120 for Inmarsat 3F2 AOR E 15 5 West d 124 for Artemis 21 5 East d 126 for Inmarsat 3F5 IOR W 25 0 East In MSAS system region Japan Australia and Hawaii d 129 for MTSAT 1 d 137 for MTSAT 2 3 8 NMEA Protocol Support The RX Oncore Positioning Receiver firmware supports the NMEA 0183 format for GPS data output Output of data in the NMEA 0183 stan...

Page 13: ...eceives electrical power and input output signals including RF_in through an array of 54 gold pads Below are illustrations of the pin layout orientation and numbering It is recommended that the user solder the 16 ground pads in the center Fig 4 1 54 pin layout Bottom view ...

Page 14: ... Ground I 18 VCC_RF Output Voltage RF Section O 19 V_ANT Antenna Bias Voltage I 20 AADET_IN Active Antenna Detect I 21 NC MOSI SOI MOSI Reserved 22 NC SS_N SPI Slave Select Reserved 23 NC SCK SPI Clock 24 VDDUSB USB Supply I 25 USB_DM USB Data I O 26 USB_DP USB Data I O 27 EXTINT0 External Interrupt Pin I 28 Reserved Reserved X 29 Reserved Reserved X 30 Reserved Reserved X 31 Reserved Reserved X 3...

Page 15: ...ault O 42 NC NC X 43 Firmware Firmware Reflash I 44 Reserved Reserved X 45 Reserved Reserved X 46 Reserved Reserved X 47 Reserved Reserved X 48 Reserved Reserved X 49 Reserved Reserved X 50 Reserved Reserved X 51 Reserved Reserved X 52 NC NC X 53 Reserved Reserved X 54 Reserved Reserved X Table 5 1 Pin Definition ...

Page 16: ...Document Number 403 GPS 070 Page 12 6 Mechanical Dimensions Fig 6 1 Mechanical Dimensions ...

Page 17: ...Document Number 403 GPS 070 Page 13 7 Packaging Detail Fig 7 1 Packaging Dimensions ...

Page 18: ...input voltage of 3 3V must be connected to the VCC pin pin 6 to supply all the power requirements of the module See Fig 1 This is also being fed back to the VCC_OUT pin pin 8 VCC is also an input to an LDO U7 which outputs 2 7V to supply the VCCRF pin pin 18 and be able to support an external LNA Fig 8 1 VCC power supply ...

Page 19: ...Number 403 GPS 070 Page 15 8 2 VBATT Fig 8 2 VBATT voltage input VBATT is a 1 8V input that ensures the RTC TCXO and the Wakeup Controller remains powered and active in the event of a failure in VCC Power Supply ...

Page 20: ...m RFIN pin is required to have 50 impedance with passive matching circuitry For active antenna the required voltage is to be catered by the host via VANT pin Active antenna gain should not exceed 50 dB and the noise figure should not exceed 3 dB Fig 9 1 Antenna block diagram The built in antenna sensing circuitry coupled with the host s ANTDET control the power supply to the active antenna The sen...

Page 21: ... RX Oncore supports 3V or 5V active antenna only To support passive GPS Antenna tie VANT to GND When short circuit was detected the voltage supply to the antenna will be automatically shut down Antenna sense circuitry detects the following conditions Active antenna connected No active antenna connected Antenna short circuit ...

Page 22: ...ck End The Front End phase is used to search the correction messages received from the SBAS system by using a GPS channel dedicated to the SBAS satellite signal receipt It is composed of the Viterbi module and Framer module The First module uses the Viterbi algorithm to decode the input stream The second module uses a state machine and pattern matching algorithm Knuth Morris Pratt to search the SB...

Page 23: ... every GPS satellite by using a GPS library function 10 1 Available SBAS Satellites In WAAS system region USA Canada and Mexico 122 for Inmarsat 3F4 AOR W 54 0 West http www lyngsat com tracker inmar3f4 shtml 134 for Inmarsat 3F3 POR 178 0 East http www lyngsat com tracker inmar3f3 shtml In EGNOS system region Europe and Africa 120 for Inmarsat 3F2 AOR E 15 5 West http www lyngsat com tracker inma...

Page 24: ...SBAS function PSTMSBASSAT Change the SBAS Satellite PRN ID 10 3 Effectiveness With the implementation of SBAS functionalities in the RX Oncore module the positional accuracy is able to be improved upon drastically The following 2 figures show the improvement of the GPS position with SBAS versus non SBAS using the same RX Oncore module In Europe using prn 131 Fig 10 2 SBAS Europe effectiveness ...

Page 25: ...Document Number 403 GPS 070 Page 21 In United States of America using prn 122 Fig 10 3 SBAS USA effectiveness ...

Page 26: ...m the host system Because the electromagnetic environment will vary for each OEM application it is not possible to define exact guidelines to assure electromagnetic compatibility The frequency of GPS is 1 575 GHz Frequencies or harmonics close to the GPS frequency may interfere with the operation of the receiver desensitizing the performance Symptoms include lower signal to noise values longer TTF...

Page 27: ...certified as a RoHS compliant module If required all supporting documents regarding the RoHS material used on RX Oncore will be given upon request 11 5 SMT Reflow Profile The RX Oncore module is a surface mount device It has the capability to be manually soldered or mounted using a Solder Reflow Process Below is the recommended lead Free Solder Reflow Profile Fig 11 1 Reflow solder profile ...

Page 28: ...ors for the automated circuit board assembly systems Each reel contains a maximum of 500pcs of RX Oncore modules which enables the pick and place automated machines reloaded less frequently In turn this saves labor and will further reduce the manufacturing costs for the overall automated circuit board assembly Fig 12 1 Carrier tape overview TRANSPARENT COVER TAPE SECURE MODULE IN CAVITY RX ONCORE ...

Page 29: ... Fig 12 2 Carrier tape dimensions NOTES 1 CARRIER TAPE MATERIAL HIGH IMPACT POLYSTYRENE CONDUCTIVE BLACK 2 DRAWING UNITS IN MM 3 DIMENSION GENERAL TOLERANCE 0 10mm UNLESS OTHERWISE SPECIFIED 4 THE MAXIMUM CUMULATIVE TOLERANCE IS 0 20mm FOR 10 SPROCKET HOLE PITCH ...

Page 30: ...S 070 Page 26 12 3 Plastic Reel Detail Fig 12 3 Reel dimensions A REEL SIZE W WIDTH SIZE B HUB SIZE C D E F G COLOUR MATERIAL Ø330 00m m 13 32 00mm Ø100 00m m 4 21 10mm 13 00mm 2 00mm 2 20mm 90 WHITE HIGH IMPACT POLYSTYR ENE ...

Page 31: ...nyone who is not grounded 4 DO NOT wax grounded static controlled conductive floor and bench top mats This would allow build up of an insulating layer and thus defeating the purpose of a conductive work surface 5 DO NOT touch the RX Oncore module with clothing or textiles even though grounded wrist strap is worn This does not apply if conductive coats are worn 6 DO check the grounded wrist strap c...

Page 32: ...el with MSL level is pasted on reel to describe the product information An Humidity Indicator will be paste on reel to tell the condition Fig 13 1 Tape and reel shipment For protection from physical damage the reels are individually packed in a pizza box Fig 13 2 ESD packaging and box Product Label with MSL level shown Caution Label to describe the handling requirement to prevent from humidity int...

Page 33: ...PS 070 Page 29 Diagram below shows the dimension of pizza box Fig 13 3 Box dimensions Each carton box contains of 4 pizza box A carton box will be sealed with RPG tape at both top and bottom side Fig 13 4 Carton dimensions ...

Page 34: ...Document Number 403 GPS 070 Page 30 13 3 Storage As shown on the Caution Label the shelf life is 12 months at 40 c and 90 Relative Humidity RH Fig 13 5 Caution label ...

Page 35: ...Document Number 403 GPS 070 Page 31 14 Reference Design Fig 14 1 Reference design ...

Page 36: ... use with the RX Oncore receiver The small footprint low profile package and the shielded LNA low noise amplifier offer significantly enhanced performance while operating in a variety of GPS environments Furthermore magnetic and blind hole direct mounting options and waterproof shell make the antenna suitable for a number of different installation configurations Fig 15 1 GPS Active Antenna ...

Page 37: ...Document Number 403 GPS 070 Page 33 15 2 Technical Specifications Table 15 1 OncoreM Silver GPS Active antenna ...

Page 38: ...ernment the degradation in accuracy shall occur without prior warnings and sometimes satellites don t transmit signal due to adjustment test and orbital revision Also please note 1 Products such as motors computer and RF devices which emit high levels of magnetic field and interference that may cause the performance of the GPS unit to drop 2 The optimal position during automobile applications is o...

Page 39: ...the following figure The gain pattern clearly indicates that the Hawk antenna is designed for full upper hemispherical coverage with the gain diminishing at low elevations This cross section is representative of any vertical cross section over a full 360 degree azimuth range and thus the 3 dimensional gain patterns is a symmetric spheroid surface It is important to note that this gain pattern vari...

Page 40: ...Document Number 403 GPS 070 Page 36 Fig 15 4 Active antenna gain pattern ...

Page 41: ...ons 15 6 Antenna Placement When mounting the Hawk antenna module it is important to remember that GPS positioning performance will be optimal when the antenna patch plane is level with the local geographic horizon and the antenna has full view of the sky ensuring direct line of sight to all visible satellites over head Fig 15 3 Correct antenna placements ...

Page 42: ...16 Ordering Information The RX Oncore module can be ordered using the following part number IL GPS 0070 B The RX Oncore Evaluation Kit can be ordered using the following part number IL GPS EVK 0070 UA UART USB IL GPS EVK 0070 UB USB ONLY ...

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