SEPTENTRIO AsteRx-m2a Hardware Manual Download Page 34 | Manualshive

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EMC Considerations

34

An example of interference is shown below. This particular interference at about
1598 MHz falls in the GLONASS L1 band and slightly degrades the L1 C/N0 of some
GLONASS satellites.

Try to keep personal computers and other equipment more than 2 meters away from the
antenna while assessing electromagnetic compatibility of the integration.

RxControl also allows to observe the time domain signal. This should look like white
Gaussian noise as illustrated below.

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Summary of Contents for AsteRx-m2a

Page 1: ...AsteRx m2a Product Group Hardware Manual Version 1 4 0 ...

Page 2: ... Version 1 4 0 July 27 2018 Copyright 2000 2018 Septentrio nv sa All rights reserved Septentrio Greenhill Campus Interleuvenlaan 15i 3001 Leuven Belgium http www septentrio com support septentrio com Phone 32 16 300 800 Fax 32 16 221 640 septentrio ...

Page 3: ...2 5 I O Connectors 12 2 5 1 30 pin Connector 13 2 5 2 60 pin connector 14 2 6 External Frequency Reference Input REF IN 16 2 7 Event Inputs 16 2 8 General Purpose Output GPx 16 2 9 Standby Mode 16 2 10 SD Memory Card Usage 17 2 11 USB Interface 18 2 12 Ethernet 18 3 ASTERX M2A UAS 20 3 1 Connectors 21 3 2 Power Supply Options 22 3 3 LEDs 22 3 4 Temperature Range 22 3 5 Schematics 22 DEVELOPMENT KI...

Page 4: ...3 8 LEDs 28 3 9 COM Ports 28 3 10 PPS Out and Event Inputs 29 3 11 Ethernet 29 3 12 USB Dev 30 3 13 USB Host 30 3 14 REF IN 30 3 15 Buttons 30 3 16 SD Card Socket 30 APPENDIX A LED STATUS INDICATORS 31 APPENDIX B EMC CONSIDERATIONS 33 ...

Page 5: ...lies with the European Union EU Directive 2002 96 EC on waste electrical and electronic equipment WEEE The purpose of this Directive is the prevention of waste electrical and electronic equipment WEEE and in addition the reuse recycling and other forms of recovery of such wastes so as to reduce the disposal of waste If purchased in the European Union please return the receiver at the end of its li...

Page 6: ...anied this device Statement 0001 WARNING The power supply provided by Septentrio if any should not be replaced by another If you are using the receiver with your own power supply it must have a double isolated construction and must match the specifications of the provided power supply Statement 0003 WARNING Ultimate disposal of this product should be handled according to all national laws and regu...

Page 7: ...use techniques and equipment designed to protect personnel and equipment from electrostatic discharge Handling Remove static sensitive components and assemblies from their static shielding bags only at static safe workstations a properly grounded table and grounded floor mat and only when you are wearing a grounded wrist strap with a resistor of at least 1 mega ohm in series or other grounding dev...

Page 8: ...EM All dimensions in millimeters Weight 28 g RF connectors u FL type are mounted on top side of the PCB The 30 and 60 pin Hirose I O connectors are mounted on the bottom side view from above I O connectors on the bottom side Pin 1 Pin 1 ...

Page 9: ... Power and Power Consumption The board is powered through pin 1 and pin 2 of the 30 pin connector Power supply voltage must be 3 3V 5 The power consumption depends on the set of GNSS signals enabled with the setSignalTracking command The following table shows the typical power consumption in dual antenna mode for selected sets of signals Signals enabled with setSignalTracking Power consumption GPS...

Page 10: ...Antenna net gain range1 15 45 dB For optimal performances the net gain on ANTA and ANTB must not differ by more than 10dB Receiver noise figure NFrx see below 10 dB with 15 dB net gain The receiver noise figure increases as the net gain increases but its contribution to the system noise figure decreases The worse case is for a net gain of 15dB RF nominal input impedance 50 Ohms VSWR ANTA or ANTB 2...

Page 11: ...loss Gpreamp 30dB 15dB 15dB In this case the system noise figure is NFsys 10 log10 102 5 10 1010 10 1 1015 10 3 14 dB The C N0 in dB Hz of a GNSS signal received at a power P can be computed by C N0 P 10 log10 Tant 290 10NFsys 10 1 228 6 dB where P is the received GNSS signal power including the gain of the antenna passive radiating element in dBW e g 155dBW Tant is the antenna noise temperature i...

Page 12: ...300 ms after these states The IO_EN pin of the 60 pin connector indicates when the board is ready to accept input and can be used to enable the drivers driving the input pins Designs not using the 60 pin connector must either keep the input pins in hi Z mode for at least 300 ms after applying power or drive the nRST pin low for at least 300 ms after applying power When not using the IO_EN pin it i...

Page 13: ...logging status indicator Max output current 10 mA output impedance 20 Ohms See Appendix A 29 GND Gnd 0 Ground Pin Name Type Level Description Comment 2 Vin P 3 3V 5 Main power supply input Both Vin pins pin 1 and pin 2 must be tied together 4 GND Gnd 0 Ground 6 USB_D I O USB USB data signal negative D 8 nRST Ctrl PU LVTTL Reset input active negative Receiver resets when driven low 10 RX1 I K LVTTL...

Page 14: ...in low when ready to receive data 15 TX4 O LVTTL Serial COM 4 transmit line inactive state is high 17 Reserved 19 Reserved 21 Reserved 23 Reserved 25 Reserved 27 Reserved 29 GND Gnd Ground 31 RMII_TXEN O LVTTL LAN PHY transmit enable See section 2 12 33 RMII_TXD1 O LVTTL LAN PHY transmit data 1 See section 2 12 35 RMII_CRS_DV I LVTTL LAN PHY CRS See section 2 12 37 RMII_RXER I LVTTL LAN PHY RX err...

Page 15: ...28 Reserved 30 GND Gnd Ground 32 RMII_CLK O LVTTL LAN PHY Clock See section 2 12 34 RMII_TXD0 O LVTTL LAN PHY transmit data 0 See section 2 12 36 GND Gnd Ground 38 RMII_RXD0 I LVTTL LAN PHY receive data 0 See section 2 12 40 RMII_RXD1 I LVTTL LAN PHY receive data 1 See section 2 12 42 GND Gnd Ground 44 GP2 O LVTTL General purpose output GP2 in setGPIOFunctionality command See section 2 8 46 Reserv...

Page 16: ... two event inputs EventA on the 30 pin connector and EventB on the 60 pin connector which can be used to time tag external events Use the setEventParameters command to configure these pins e g to set the polarity Note that this feature requires the TimedEvent permission to be enabled in the receiver 2 8 General Purpose Output GPx The GP1 and GP2 pins of the 60 pin connector are general purpose LVT...

Page 17: ...Hz See instructions in the Reference Guide for details on how to configure SD card logging The receiver is compatible with SD cards of up to 32GB The file system is FAT32 Shortly driving the button pin pin 25 of 30 pin connector low toggles logging on and off Driving the button pin low for at least 5 seconds unmounts the SD card if it was mounted or mounts it if it was unmounted The SD card mount ...

Page 18: ...ate files AsteRx m2a_USB_1_1 suf and AsteRx m2a_USB_2_0 suf located in the USB folder of the firmware package can be used to change this The current USB mode can be checked with the command lif Identification 2 12Ethernet The receiver supports full duplex 10 100 Base T Ethernet communication The Ethernet PHY and magnetics are to be implemented on the host board Connection with the PHY is through t...

Page 19: ...19 19 AsteRx m2a OEM 19 ...

Page 20: ...receiver board mounted on an interface card specifically designed to ease integration in UAS Unmanned Aerial Systems and mobile mapping applications This chapter provides information on the interface card only Refer to chapter 2 for the specifications of the AsteRx m2a receiver board 1 2 ...

Page 21: ...rol a camera trigger from the PPS output signal of the AsteRx m2a J7 1 RA Header 1x2 3 3V LVTTL event input Connects to the EventA pin of the AsteRx m2a through an inverter A high to low transition at the J7 connector corresponds to a low to high transition as seen by the AsteRx m2a and vice versa This header can be connected to the flash port of a camera e g via Hot Shoe or Prontor Compur interfa...

Page 22: ...diodes prevent short circuits see schematics in section 3 5 The interface card provides the 3V3 supply to the AsteRx m2a receiver there is no need for a separate 3V3 supply for the receiver The interface card provides a 5V DC voltage to the VANT pin of the AsteRx m2a The power consumption of the interface card is 150 mW not counting the consumption of the AsteRx m2a 3 3 LEDs The PWR LED is lit if ...

Page 23: ...it in section 2 10 The interface board connects the SD card DAT3 pin to pin 24 of the 30 pin connector of the AsteRx m2a This connection is there to make the interface board compatible with the legacy AsteRx m receiver New designs made for the AsteRx m2a should leave the SD card DAT3 pin unconnected ...

Page 24: ...24 24 AsteRx m2a UAS 24 See note above ...

Page 25: ...25 25 AsteRx m2a UAS 25 ...

Page 26: ...the board from a PC or from a standard phone charger adapter The supported USB voltage range is 4 5V 5 5V 2 Using the POWER connector J203 The supported voltage range is 5 36V It is safe to provide power to both connectors in parallel The DevKit will use the source with the highest voltage Make sure that a jumper is placed on header J200 as shown below Otherwise the DevKit will be powered but not ...

Page 27: ...ecommended to set the multimeter in high ampere setting to keep the voltage drop as low as possible 3 7 Antenna Connectors There is no antenna connector on the DevKit The antennas must be connected directly to the u FL connectors on the OEM board See section 2 4 for details The DC voltage 5V or 3 3V at the antenna connectors is determined by the position of the jumper on header J204 as shown below...

Page 28: ...S232 standard RTS CTS lines are supported only on COM2 and COM3 Connection to a PC is done through a null modem cable Alternatively 3 3V TTL signals are available through four 6 pin headers as shown below The pinout is compatible with standard FTDI 6 pin SIL connectors To route a COM port to the 6 pin header instead of the BD9 connector a jumper must be placed on J800 COM1 J801 COM2 J804 COM3 and ...

Page 29: ...re connected to the EventA and EventB pins of the AsteRx m2a through a buffer The voltage level at the header pins must be between 0 5V and 6V These pins are pulled down by a 100kOhm resistor See section 2 7 for more details 3 11Ethernet The DevKit supports 10 100 Base T Ethernet It is not possible to power the DevKit through the Ethernet connector EVENTB EVENTA PPSOUT COM1 COM2 COM3 COM4 GND RTS ...

Page 30: ...uttons Pressing the nRST button drives the nRST pin of the AsteRx m2a low which resets the receiver Pressing the LOGGING button drives the Button pin of the AsteRx m2a low This can be used to enabled and disable logging as described in section 2 10 The buttons are also connected to J601 and J602 2 pin headers see above picture Tying the nRST or LOGGING pins of these headers to ground is the same a...

Page 31: ...or which differential corrections have been provided in the last received differential correction message RTCM or CMR LED behaviour Number of satellites with corrections LED is off No differential correction message received blinks fast and continuously 10 times per second 0 blinks once then pauses 1 2 blinks twice then pauses 3 4 blinks 3 times then pauses 5 6 blinks 4 times then pauses 7 8 blink...

Page 32: ... activity LED LED Behaviour LOGLED LED is off when the SD card is not present or not mounted LED is on when the SD card is present and mounted Short blinks indicate logging activity During boot i e during the first seconds after powering the receiver the state of the LEDs is not defined ...

Page 33: ...ditions the C N0 values should reach up to 50 dB Hz for the strong signals on L1 and up to 45 dB Hz on L2 as illustrated below If the maximum C N0 is lower than expected interference and cross talk from nearby electronics is likely and the source of the problem needs to be identified This is where the RF spectrum monitor built in the AsteRx m2a comes in handy The spectrum monitor can be accessed i...

Page 34: ...band and slightly degrades the L1 C N0 of some GLONASS satellites Try to keep personal computers and other equipment more than 2 meters away from the antenna while assessing electromagnetic compatibility of the integration RxControl also allows to observe the time domain signal This should look like white Gaussian noise as illustrated below ...

Page 35: ...and the system frequencies For example peaks at 1200 and 1248 MHz are an indication of an interfering source at 48 MHz as this maps to the 25th and 26th harmonic of a 48 MHz signal This may correspond to the frequency of a microcontroller in the application Integration cross talk can be solved in a number of ways Shift the clock frequency of the interfering signal to avoid the GNSS bands Use shiel...

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