Safety Information il CHC® N72™ GNSS Reference Receiver Revision 1.
Copyright Copyright 2009‐2015 CHC | Shanghai HuaCe Navigation Technology Ltd. All rights reserved. The CHC are trademark of Shanghai HuaCe Navigation Technology Limited. All other trademarks are the property of their respective owners. Trademarks All product and brand names mentioned in this publication are trademarks of their respective holders. Safety Warnings The Global Positioning System (GPS) is operated by the U.S.
SAFETY INFORMATION Before you use your CHC® N72™ GNSS reference receiver, make sure that you have read and understood all safety requirements. REGULATIONS AND SAFETY The receiver contains an internal wireless modem for communicating signals through Bluetooth® wireless technology or through an external data communications radio. Regulations regarding the use of the wireless modem vary greatly from country to country. In some countries, the unit can be used without obtaining an end‐user license.
Safety Information explosive atmosphere. All equipment must be correctly grounded for safe operation. All equipment should be serviced only by a qualified technician. BATTERY SAFETY WARNING – Do not damage the rechargeable Lithium‐ion battery. A damaged battery can cause an explosion or fire, and can result in personal injury and/or property damage. To prevent injury or damage: – Do not use or charge the battery if it appears to be damaged.
Safety Information DC POWER SUPPLY SAFETY WARNING – When DC voltage is applied to this receiver through COM 1 or COM 2 (Lemo connectors), the DC voltage must be limited to no more than 36 V DC +0% under both normal and single fault conditions. If the recommended input voltage is exceeded, the receiver may present an electrical hazard.
CONTENTS Safety Information ........................................................................................................................................... 2 Regulations and safety............................................................................................................................. 2 Type approval ..........................................................................................................................................
5.4. Setting up the receiver as part of an Ethernet configuration ......................................................... 25 6. Configuring the Receiver: Other Than Keypad and Display ....................................................................... 26 6.1. Configuring the Ethernet settings ................................................................................................... 26 6.2. Configuring through a web browser ......................................................................
1. INTRODUCTION The N72 GNSS Reference Receiver User Guide describes how to set up and use the CHC® N72™ GNSS reference receiver. In this manual, “the receiver” refers to the N72 GNSS reference receiver unless otherwise stated. Even if you have used other Global Navigation Satellite Systems (GNSS) products before, CHC recommends that you spend some time reading this manual to learn about the special features of this product. If you are not familiar with GNSS, go to www.chcnav.
1. Introduction 1.3. DISCLAIMER Before using the receiver, please make sure that you have read and understood this User Guide, as well as the safety requirements. CHC holds no responsibility for the wrong operation by users and for the losses incurred by the wrong understanding about this User Guide. However, CHC reserves the rights to update and optimize the contents in this guide regularly. Please contact your local CHC dealer for new information. 1.4.
2. OVERVIEW This chapter introduces the N72 GNSS reference receiver (“the receiver”). This receiver makes it easy to set up a powerful and reliable Continuously Operating Reference Station (CORS) or to collect data from temporary field locations. The receiver is ideal for the following infrastructure applications: As part of a GNSS Infrastructure network in conjunction with CHC Reference Station Network (CRNet) software. As part of a permanent reference station with or without supporting software.
2. Overview 2.1.1. THE NETWORK APPLIANCE CONCEPT Traditionally, a GNSS receiver has one operator. That person is the only user of the receiver so they can change settings without affecting other users. With the N72 GNSS reference receiver, an operator can configure a receiver once, and then make it available as a network appliance for general use by one or more users (or clients).
2. Overview 2.3.
2. Overview 2.5. ELECTRONIC INTERFACE High‐power signals from a nearby radio or radar transmitter can overwhelm the receiver circuits. This does not harm the instrument, but it can prevent the receiver electronics from functioning correctly. Avoid locating the receiver or antenna within 400 meters of powerful radar, television, or other transmitters or GNSS antennas. Low‐power transmitters, such as those in cell phones and two‐way radios, normally do not interfere with receiver operations. 2.6.
2. Overview 2.7. REAR CONNECTORS 2 1 6 2.8. 3 7 4 5 8 9 Connector type Description 1 TNC Connect to the GNSS antenna 2 SIM card slot SIM card is inserted here to connect GPRS network 3 USB Connect to external USB drive for external data logging after configured through web interface. Upgrade the receiver firmware with the inserted USB driver containing the related upgrade file after restart the receiver.
2. Overview Lemo cable (CHC Data Cable). Data streaming transmission port.
3. BATTERIES AND POWER The N72 GNSS reference receiver uses an internal rechargeable Lithium‐ion battery, which can be replaced only at an Authorized CHC Service Center. The receiver can also be powered by an external power source that is connected to either of the Lemo ports. The operational time provided by the internal battery depends on the type of measurement and operating conditions. Typically, the internal battery provides up to 17 hours operation.
3. Batteries and Power normal and single fault conditions. This product may present an electrical hazard if the recommended input voltage is exceeded. 3.2. BATTERY SAFETY The receiver is powered by a rechargeable internal Lithium‐ion battery. Charge and use the battery only in strict accordance with the following instructions. WARNING – Do not damage the rechargeable Lithium‐ion battery. A damaged battery can cause an explosion or fire, and can result in personal injury and/or property damage.
3. Batteries and Power 3.4. CHARGING THE BATTERY The rechargeable Lithium‐ion battery is supplied partially charged. Charge the battery completely before using it for the first time. If the battery has been stored for longer than three months, charge it before use. When connected to a suitable power source, the internal battery charges fully in 10 hours. WARNING – Charge and use the rechargeable Lithium‐ion battery only in strict accordance with the instructions.
3. Batteries and Power Service Center. If the battery is removed at an unauthorized service center, the remaining warranty on the product will be void.
4. SETTING UP THE RECEIVER This chapter describes best practices for setting up the equipment, and outlines the precautions that you must take to protect the equipment. It also describes the typical installation diagram of reference station composed of N72 GNSS receiver, GNSS antenna, external power and network cable. The antenna installation guidelines described here are the minimum standards.
4. Setting Up the Receiver power the receiver. The internal battery can also operate as a UPS for up to 17 hours. A UPS protects the equipment from power surges and spikes, and keeps the receiver running during short power outages. For more information, contact your local CHC dealer. 4.1.4. LIGHTING AND SURGE PROTECTION CHC recommends that you install lightning protection equipment at permanent sites. All connections to the receiver should have surge protection.
4. Setting Up the Receiver Mount stability that is not influenced by thermal expansion, wind loading, or soil expansion/contraction. For additional information on this topic, research the reference antenna installation guidelines published by the: US National Geodetic Survey (http://www.ngs.noaa.gov/PUBS_LIB/CORS_guidelines.pdf) International GNSS Service (http://igscb.jpl.nasa.gov/network/guidelines/guidelines.html) 4.2. SYSTEM INSTALLATION 4.2.1.
4. Setting Up the Receiver Network Cable CHC A220GR GNSS Geodetic Antenna GNSS Antenna Cable CHC Data Cable Adapter 1. Install the GNSS antenna at the appropriate location (see 4.1.5. Place the antenna for the guidelines); connect the antenna to the TNC Plug Socket of N72 via the GNSS Antenna Cable. 2. Power the N72 by external power source (e.g. mains supply) with Adapter via CHC Data Cable. A. Connect the 10‐pin Lemo of CHC Data Cable to COM 1 or COM 2 of N72. B.
5. CONFIGURING THE RECEIVER: KEYPAD AND DISPLAY The N72 GNSS reference receiver features a front panel user interface with a keypad and a two‐line alphanumeric display (see page 14). This interface enables you to configure many of the receiver’s features without using an external controller or computer. 5.1. BUTTON FUNCTIONS Use the buttons on the front panel to turn on or turn off the receiver and to check or change the receiver settings. Button Name Function Power Turn on or turn off the receiver.
5. Configuring the Receiver: Keypad and Display The Home screen shows: The name of the product. The position solution. The number of satellites being tracked. As a power‐saving feature, the front panel goes dark after a short period of inactivity. If the display is not lit and the receiver is on, press ANY BUTTON to reactivate the display. 5.3. STATUS SCREENS To review the receiver's current settings in the status screens, press or on the front panel.
5. Configuring the Receiver: Keypad and Display 5.4. SETTING UP THE RECEIVER AS PART OF AN ETHERNET CONFIGURATION Use the keypad to set up the receiver as part of an Ethernet configuration. Press or press to enter the edit mode. 1. to move between different status screens, and then or connect the receiver with external Turn on receiver by press power supply. 2. Press or 3. Press to edit IP address. 4. Press or or 5. to move to IP Addr status screen.
6. CONFIGURING THE RECEIVER: OTHER THAN KEYPAD AND DISPLAY You can configure the N72 GNSS reference receiver to perform a wide variety of functions. This chapter describes the configuration methods other than the front panel display, and explains when and why each method is used. The WinFlash utility described in this chapter is used primarily to update the receiver firmware. 6.1.
6. Configuring the Receiver: Other Than Keypad and Display 6.2. CONFIGURING THROUGH A WEB BROWSER Supported browsers: Google Chrome R Microsoft Internet Explorer○ version 10, or higher Apple Safari To connect to the receiver through a web browser: 1. Enter the IP address of the receiver into the address bar of the web browser: 2.
6. Configuring the Receiver: Other Than Keypad and Display 6.2.1. CHANGING THE SETTINGS The web interface shows the configuration menus on the left of the browser window, and the setting on the right. Each configuration menu contains the related submenus to configure the receiver and monitor receiver performance. This section describes each configuration menu.
6. Configuring the Receiver: Other Than Keypad and Display Position This page shows the relevant position information about the receiver's position solution which including the position, DOP values, satellites used and tracked, and the receiver clock information. Operation Lists several important items to help you understand how the receiver is being used and its current operating condition.
6. Configuring the Receiver: Other Than Keypad and Display Google map Tap this submenu to show the location of the receiver on Google map.
6. Configuring the Receiver: Other Than Keypad and Display 6.2.1.2. Satellites menu Use the Satellites menu to view satellite tracking details and enable/disable GPS, SBAS, GLONASS, BDS and Galileo constellations. These menus include tabular and graphical displays to provide all required information on satellite tracking status.
6. Configuring the Receiver: Other Than Keypad and Display SkyPlot The following figure is an example of Skyplot page. Satellite Settings In this submenu, users can enable/disable GPS, SBAS, GLONASS, BDS and Galileo constellations.
6. Configuring the Receiver: Other Than Keypad and Display 6.2.1.3. Receiver Settings menu Use this menu to configure settings such as the antenna type and height, elevation mask and PDOP setting, the reference station coordinates, receiver resetting and web interface language: Introduction This submenu shows the receiver information and reference station information, including antenna related information, elevation mask angle, reference station work mode and position, etc.
6. Configuring the Receiver: Other Than Keypad and Display and broadcast RTK correctors: Reference Station Settings Use this screen to configure settings such as the station coordinates. You must enter accurate information in these fields, as this data significantly affects the accuracy of logged data files and broadcast RTK correctors. For Reference Station Mode: There are three available options: Auto Rover, Auto Base and Manual Base.
6. Configuring the Receiver: Other Than Keypad and Display For Reference Latitude and Reference Longitude: There are mainly three methods to enter the reference coordinates and shown as follows: Acquire Current Position: Click this button to acquire current position obtained through single‐point positioning automatically. Manual Input: Manually input a known coordinates. From CORS: After logging in CORS, the receiver will obtain a coordinates based on fix solution. (See 6.2.1.5.
6. Configuring the Receiver: Other Than Keypad and Display Use this screen to select the web interface language: 6.2.1.4. Data Recording menu Use the Data Logging menu to set up the receiver to log static GNSS data and to view the logging settings. You can configure settings such as observable rate, recording rate, continuous logging limit, and whether to auto delete old files if memory is low.
6. Configuring the Receiver: Other Than Keypad and Display To open or close all the storage threads, click the [ON] or [OFF] button to the right of Log Status field. NOTE – The [ON] and [OFF] button to the right of Log Status field are the Master Log Switch. Every storage thread can log data only when the Master Log Switch is ON. And users can edit the settings of storage threads only when the Master Log Switch is OFF.
6. Configuring the Receiver: Other Than Keypad and Display In this screen, you can set all data logging parameters, and determine whether the recording files will be affected by the FTP Push. The parameters are mainly as follows: On or Off: Select “Yes” or “No” to determine whether to log data when the Master Log Switch is ON. Recording Name: The name of this storage thread. Sample Interval: Select the observable rate from the dropdown list.
6. Configuring the Receiver: Other Than Keypad and Display FTP Push Recording Shows the related information about the recorded filed that be pushed. And users can click [Clear Ftp Send Log] button in the upper right corner to clear the status of FTP Push operations. Data Download In this submenu, users can download the data files that recorded in the internal storage through the internal FTP site. 1.
6. Configuring the Receiver: Other Than Keypad and Display 3. To find the file need to be downloaded, click the name of storage thread the date of file that be recorded the format of the file the name of the target file. 4. To download a file, left‐click the name of the target file download the file according to the prompts. 6.2.1.5. IO Settings menu Use the IO Settings menu to set up all receiver outputs and inputs.
6. Configuring the Receiver: Other Than Keypad and Display In this submenu, users can configure 5 types of input and output settings. 1. RTK Client After configuring the settings of RTK client, users can log on CORS or APIS. Click the [Connect] button to the right the IO Settings screen will appear choose one of the connection protocols among the NTRIP, APIS_BASE and APIS_ROVER configure the related parameters to log on CORS or APIS.
6. Configuring the Receiver: Other Than Keypad and Display 2. Connection Protocol: APIS_ROVER TCP/UDP Client Click the [Connect] button to the right of required TCP/UDP Client the IO Settings screen will appear select the connection protocol from the dropdown list enter the IP and Port of the target server configure messages that you want to output to the target server click to save and complete the connection.
6. Configuring the Receiver: Other Than Keypad and Display NOTE: If the receiver and server are under the same Local Area Network (LAN), users can use the IP address in LAN of the server with any Port. However, if the receiver and server are under the two different LAN, users should use the public IP address of the server and configure the port mapping of the server. 3.
6. Configuring the Receiver: Other Than Keypad and Display 4. COM Port Click the [Settings] button to the right of required COM Port the Serial Port Setup screen will appear select Baud Rate used to transmit data configure the messages that you want to output through the serial port click to save the settings and start to transmit. 5.
6. Configuring the Receiver: Other Than Keypad and Display 6.2.1.6. GPRS menu Network Info: network info shows power status, network mode, connection protocol, signal strength, SIM status and dialing status. Network set：mainly to set GPRS model status, auto start, network mode ( generally users select [2G/3G Auto]), parameter settings and so on. 6.2.1.7. Radio setting menu Radio Info: shows radio type, radio power, OTA baud rate, radio frequency and so on.
6. Configuring the Receiver: Other Than Keypad and Display required to be used, the premises are also turning on radio status, setting appropriate frequency, power and so on. 6.2.1.8. WAN menu Use this menu to check and configure the Ethernet settings. Network Info The following figure shows an example of the screen that appears when you select this submenu: Network Set Use this submenu to configure the related parameters of the Network, including static IP, subnet mask, etc.
6. Configuring the Receiver: Other Than Keypad and Display 6.2.1.9. Wifi menu Use this menu to check and configure the Wifi settings. Wifi Info The following figure shows an example of the screen that appears when you select this submenu: Wifi Settings Use this submenu to configure the related parameters of the Wi‐Fi settings, including Wi‐Fi mode, encrypt type, password, etc.
6. Configuring the Receiver: Other Than Keypad and Display 6.2.1.10. Bluetooth Set menu Use this menu to configure Bluetooth settings. Bluetooth Set The following figure shows an example of the screen that appears when you select this submenu: 6.2.1.11. Network Service menu Use this menu to configure the receiver’s HTTP port, and the username and password of internal FTP site.
6. Configuring the Receiver: Other Than Keypad and Display FTP Service 6.2.1.12. Firmware menu Use this menu to check the current firmware information, download the system log, update the receiver firmware, download or update the configuration file and register the receiver. Firmware Info Use this submenu to check the current firmware information. The following figure shows an example of the firmware information. System Log Use this submenu to download the system log of the receiver.
6. Configuring the Receiver: Other Than Keypad and Display upgrading. NOTE: It will take about 2 or 3 minutes to complete the firmware upgrading. Config File In this submenu, users can download the configuration file by clicking button and determine a saving path to download the configuration file (.cfg file). Also, users can click the [Browse] button to locate the existing configuration file click [Confirm] button to confirm the selected file and start updating.
6.
7. DEFAULT SETTING AND CONFIGURATION FILES Most of the receiver settings are stored in application files. The default application file, Default.cfg, is stored permanently in the receiver, and contains the factory default settings for the N72 GNSS reference receiver. Whenever the receiver is reset to its factory defaults, the current settings (stored in the current configuration file, copy.cfg) are reset to the values in the default application file.
7. Default Settings and Application Files 7.1.2. USING CONFIGURATION FILES TO DUPLICATE RECEIVER SETTINGS The N72 GNSS reference receiver allows the extensive use of application files in order to retain a unique receiver configuration. With this receiver, you can create a configuration file that includes most of the receiver's unique configuration settings.
8. SPECIFICATIONS This chapter describes the specifications for the N72 GNSS reference receiver. Specifications are subject to change without notice. 8.1.
8. Specifications 8.3. PHYSICAL Feature Specification Size 265 x 143 x 68 mm (10.4 x 5.6 x 2.7 in) Weight 2.1 kg (74 oz) Operating temperature ‐40 °C to +65 °C (‐40 °F to +149 °F) Storage temperature ‐45 °C to +80 °C (‐49 °F to +176 °F) Humidity 100% condensation Waterproof and dust Tested to IP67; waterproof for temporary immersion to a depth of 1 m proof (3.28 ft) for 30 minutes; dustproof Shock Designed to survive a 1 m (3.28 ft) drop onto concrete 8.4.
8. Specifications 8.6.
A. UPGRADING THE RECEIVER FIRMWARE The receiver is supplied with the latest version of the receiver firmware already installed. If a later version of the firmware becomes available, use the USB device to upgrade the firmware on your receiver. For the latest firmware resource, please consult your local CHC dealer. You can also upgrade the receiver through the web interface. The firmware file required to upgrade the receiver through the Web interface is located in the folder where the user saves the file.
A. Upgrading the Receiver Firmware A.II.ii. UPGRADING THROUGH A BROWSER Please connect to the receiver through a web browser according to 6.2. Configuring through a web browser, and then refer to 6.2.1.10 Firmware menu Firmware Update for detail operation steps. NOTE: After the receiver firmware upgrading, the IP information may be changed. Please confirm the IP setting of the receiver before using it.
B. TROUBLESHOOTING Use this appendix to identify and solve common problems that may occur during the use of the receiver. Please read this section before you contact CHC Technical Support. B.I. RECEIVER ISSUES This section describes some possible receiver issues, possible causes, and how to solve them. Issue Possible cause Solution The receiver does External power is too Check the charge on the external battery and, if applicable, not turn on. low. check the fuse.
B. Troubleshooting The GNSS antenna is not Make sure that the GNSS antenna is located with a clear in clear line of sight to view of the sky. the sky. Restart the receiver as a last resort (turn off and then turn it on again).
C. COMMUNICATION PORTS DEFINITION C.I.
C. Communication Ports Definition 6 PWR, GND External Power Input (negative pole), External Power Ground 7 VBUS USB device 8 DM USB device 9 DP USB device 10 Not Used C.III.
D. GLOSSARY base station Also called reference station. A base station in construction, is a receiver placed at a known point on a jobsite that tracks the same satellites as an RTK rover, and provides a real‐time differential correction message stream through radio to the rover, to obtain centimeter level positions on a continuous real‐time basis.
D. Glossary States. elevation mask The angle below which the receiver will not track satellites. Normally set to 10 degrees to avoid interference problems caused by buildings and trees, and multipath errors. ephemeris / A list of predicted (accurate) positions or locations of satellites as a function of ephemerides time. A set of numerical parameters that can be used to determine a satellite’s position. Available as broadcast ephemeris or as postprocessed precise ephemeris.
D. Glossary three‐dimensional measurements. Other DOP values include VDOP (vertical DOP) and HDOP (Horizontal Dilution of Precision). Using a maximum PDOP value is ideal for situations where both vertical and horizontal precision are important. postprocessing Postprocessing is the processing of satellite data after it has been collected, in order to eliminate error. This involves using computer software to compare data from the rover with data collected at the base station.
D. Glossary communication links. It uses data from a network of reference stations to provide corrections to each rover that are more accurate than corrections from a single base station. To start using VRS corrections, the rover sends its position to the VRS server. The VRS server uses the reference station data to model systematic errors (such as ionospheric noise) at the rover position. It then sends RTCM or CMR correction messages back to the rover. WAAS Wide Area Augmentation System.
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