SkyTraq NS-HP-GN2 User Manual
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SkyTraq NS-HP-GN2 User Manual

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NS-HP-GN2 User's Guide
Rev. 0.4
August 21, 2020
1

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Summary of Contents for SkyTraq NS-HP-GN2

  • Page 1 NS-HP-GN2 User’s Guide Rev. 0.4 August 21, 2020...

  • Page 2: Table Of Contents

    APPLICATIONS ....................... 6 PIN OUT DESCRIPTION ..................7 CHECK OUT BASIC GPS FUNCTIONALITY .............. 9 SET UP NS-HP-GN2 AS RTK BASE ................ 13 Known Base Antenna Position ................14 Unknown Base Antenna Position ................. 15 Base Stream Format ..................... 17 USE NS-HP-GN2 AS RTK ROVER ................

  • Page 3: Introduction

    1. INTRODUCTION NS-HP-GN2 is a high performance multi-band multi-GNSS RTK receiver. It can accept RTCM 3.x message or SkyTraq carrier phase raw measurement data from a base station to perform carrier phase RTK processing, achieving centimeter-level accuracy relative positioning. When used with RTCM base station, the supported RTCM message types are: Type 1004 –...
  • Page 4 When used with a RTCM 3.x Virtual Reference Station (VRS) RTK base, one rover NS-HP-GN2 is needed. If one wishes to setup a local base station to work with rover, then two NS-HP-GN2 will be needed, one for base and another for rover.

  • Page 5: Features Of Ns-Hp-Gn2

    2. FEATURES OF NS-HP-GN2 RTK Receiver Features * Support RTK base and rover modes * Supports GPS/QZSS L1/L2C + Beidou B1I/B2I + Galileo E1/E5b + GLONASS L1/L2 RTK * RTK position accuracy: 1cm + 1ppm * RTK initialization time: < 10sec...

  • Page 6: Applications

    3. APPLICATIONS NS-HP-GN2 may be used for: 1. GIS data collection 2. Precision farming machine guidance 3. Precision grass cutting machine guidance 4. Precision guidance of unmanned aerial vehicles 5. Precise position tracking of race cars for performance measurement...

  • Page 7: Pin Out Description

    No connection, empty pin UART serial data input, 3.3V LVTTL. One simplex asynchronous serial UART port is implemented. This UART input is used for receiving RTCM-SC104 data or SkyTraq raw measurement data from the base at 115200. No connection, empty pin External active-low reset input to the receiver.
  • Page 8 UART serial data input, 3.3V LVTTL. One full-duplex asynchronous serial UART port is implemented. This UART input is for sending commands or information to the receiver in SkyTraq binary protocol. In the idle condition, this pin should be driven HIGH.

  • Page 9: Check Out Basic Gps Functionality

    5. CHECK OUT BASIC GPS FUNCTIONALITY Hook up as below, connect to an UART-to-USB bridge breakout board, connect antenna to RF_IN, and place antenna at a location having clear sky view. After driver for the UART-to-USB bridge chip has been installed, select proper COM port and 115200 baud rate on GNSS Viewer, click CLOSE, GNSS Viewer will show signal being acquired and tracked.
  • Page 10 GNSS Viewer for Windows PC can be downloaded from: http://navspark.mybigcommerce.com/content/GNSS_Viewer.zip http://navspark.mybigcommerce.com/content/GNSS-Viewer-User-Guide.rev0.2.pdf If uncertain of the COM port, it can be found from the Windows Device Manager.
  • Page 11 If wishing to change NMEA output baud rate, from Binary pull-down menu select Configure Serial Port, select desired baud rate and Update to SRAM+Flash.
  • Page 12 If wishing to change NMEA solution output updated rate, from Binary pull-down menu select Configure Position Update Rate, select desired update rate and Update to SRAM+Flash. When changing to higher update rate, make sure baud rate in use can accommodate it. If baud rate is not fast enough, NMEA message output will be truncated.

  • Page 13: Set Up Ns-Hp-Gn2 As Rtk Base

    6. SET UP NS-HP-GN2 AS RTK BASE Hook up as below; connect to an UART-to-USB bridge breakout board for connecting to GNSS Viewer running on a Windows PC.

  • Page 14: Known Base Antenna Position

    When configured as base, NS-HP-GN2 will output its position along with carrier phase raw measurement data over UART TXD. If base NS-HP-GN2 antenna will be placed at a location with known position, the position information can be set into NS-HP-GN2 using GNSS Viewer.

  • Page 15: Unknown Base Antenna Position

    Unknown Base Antenna Position If base antenna position is unknown, set to let it survey for 60sec upon power up. From GNSS Viewer RTK pull-down menu, select Configure RTK Mode And Operational Function, select Survey Mode and set Survey Length to 60 and Update to SRAM+Flash.
  • Page 16 Set Origin button may need to be clicked to center the view in order to see the scatter plot. Next time powering on the base NS-HP-GN2, it will still start from survey mode again, self-survey for 60 seconds, with self-surveyed antenna location at different location unless static mode is chosen and a constant position is entered.

  • Page 17: Base Stream Format

    9) Message type 0xE7 – GNSS SV and Channel Status 10) Message type 0xE8 –GNSS SV Elevation and Azimuth Status The necessary message types of base stream used for NS-HP-GN2 RTK rover mode are only “Receiver Navigation Status (0xDF)” and “Extended RAW Measurement (0xE5)”. To decrease the throughput of base stream, other unnecessary message types can be disabled from the base stream.
  • Page 18 In addition to SkyTraq RAW measurement protocol, NS-HP-GN2 also supports RTCM 3 format output. From GNSS viewer RAW pull-down menu, select Configure RTCM Measurement Data Out, select Enable RTCM Output, select Stationary RTK Reference Station ARP , select MSM7s and Update to...
  • Page 19 It’s deserved to be mentioned that it’s necessary to restart rover receiver if the format of base stream is changed. RTCM format has much less data rate requirement than binary raw measurement format. For applications that send base data over radio to the rover, RTCM format is preferred. A minimum of 19200bps data rate is required for quad-GNSS operation;...

  • Page 20: Use Ns-Hp-Gn2 As Rtk Rover

    7. USE NS-HP-GN2 AS RTK ROVER NS-HP-GN2 is configured as rover during production. If NS-HP-GN2 has been previously configured as base, to re-configure it as rover, hook up as below; connect to an UART-to-USB bridge breakout board for connecting to GNSS Viewer running on a Windows PC.
  • Page 21 UART RX2 input and apply power, NMEA result will come out from UART TXD output. The base data may come from a NS-HP-GN2 base sent over wireless radio, or a remote RTCM 3.x base station within 30Km range retrieved by NTRIP client over Internet and send over...
  • Page 23 To become acquainted with NS-HP-GN2 RTK rover operation, it’s best to first use GNSS Viewer to monitor and interact with it. One possible setup scenario is as below. With two antennas connected and placed at location having clear sky view to receive GNSS signal,...
  • Page 24 RTK Age indicates the lag delay in received base data. If RTK Age is 30 or more, indicating lag of 30 second or more, receiver state will show Position Fix 3D, NS-HP-GN2 will not try to compute RTK solution. Large RTK Age indicates some problem with transmission causing severe lag delay.
  • Page 25 To use NS-HP-GN2 with Android smartphone or tablet, improving its GPS accuracy 100-fold to centimeter-level RTK for the Apps, a tutorial is available here: http://www.navspark.com.tw/high-precision/#20151204_1...

  • Page 26: Moving Base Mode

    8. MOVING BASE MODE Normally GPS heading is derived from velocity; when GPS receiver is not moving, it could not have correct heading information. Moving base mode allows reporting of highly accurate heading direction, from base antenna to rover antenna, even when the antennas are static. PSTI,032 message output this heading and baseline information;...
  • Page 27 Moving Base * maximum 5Hz update rate For N-Hz NS-HP-GN2 in Normal RTK mode, it only needs to work with 1Hz base. For N-Hz rover in moving base mode RTK mode, it needs to work with N-Hz base. For rover in moving base RTK mode, format of the base stream output can be configured to RTCM...

  • Page 28: Advanced Moving Base Mode

    9. ADVANCED MOVING BASE MODE Advanced moving base mode allows reporting of highly accurate position, heading direction and baseline information. The heading direction reported by (advanced) moving base mode is the course between north direction and baseline vector (from base antenna B to rover antenna C) direction, so called azimuth.

  • Page 29: Active Antenna Consideration

    10. ACTIVE ANTENNA CONSIDERATION External Survey Grade Helix For RTK application, the active antenna must be able to provide signal over 37dB under open sky. Antennas vary in price, from under $50 to over $300; they mainly differ in interference rejection capability, multipath rejection capability, antenna phase center stability, and weight.

  • Page 30: Firmware Update

    11. FIRMWARE UPDATE When there is firmware update release, it’ll be made available on the NS-HP-GN2 web store product page. To update firmware using GNSS Viewer: 1. Connect TXD and RXD to an UART-to-USB bridge breakout board for connecting to a Windows PC...
  • Page 31 3. Click … to select firmware to update, then click Download button to update firmware 4. Firmware has default set to rover mode. If using NS-HP-GN2 as base, procedure for setting up base mode and antenna position needs to be done again after firmware update,...

  • Page 32: Possible Connection For Quadcopter Application

    12. POSSIBLE CONNECTION FOR QUADCOPTER APPLICATION Pixhawk Rover Connection Ground Base Connection...
  • Page 33 For the 3.3V Regulator in above figure, if you already have the UART-to-USB Adapter breakout board from the web-store, you can modify as below adding a wire connecting pin-stick to capacitor (red wire) and have a 5V-to-3.3V LDO regulator to use.

  • Page 34: Change Log

    CHANGE LOG Version 0.4 August 21, 2020 1. Update RTCM message types and figures. 2. Added Advanced Moving Base mode Version 0.3 March 18, 2020 1. Removed Galileo E1/E5b from page-4 footnote Version 0.2 January 17, 2020 1. Updated supported base input RTCM message types 2.

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