EVK-M9DR - User guide
UBX-21049360 - R01
Contents
Page 8 of 32
C1-Public
3
Getting started
This chapter works as a simple step-by-step guide for successfully setting up the device and using it
for evaluation in a basic automotive application using untethered dead reckoning (UDR) technology.
The basic evaluation process consists of four simple steps: installation, calibration, testing, and
analysis. Following the step in this chapter will help minimize errors leading to most common issues
in performance.
☞
For other application types, some modifications to the installation step may be necessary. See
chapter 4 for more information.
3.1
Installation
3.1.1
Mounting the device
Firmly attach the device to the vehicle to avoid any movement and vibration relative to the vehicle.
The device must not be attached to any moving part of the interior of the vehicle, for example, a
headrest or a rear-view mirror. A good location is in the trunk, close to the center of the rear axle of the
vehicle.
⚠
Dead reckoning performance can be seriously impaired by changes in the orientation of the device.
3.1.2
Mounting the antenna
Place the provided GNSS antenna in a location with an unobstructed view of the sky, for example, the
roof of the vehicle. For best performance, ensure that the antenna has contact to a ground plane with
a minimum of 100
–
150 mm diameter.
3.1.3
Connecting the cables
1.
Connect the GNSS antenna to the RF connector on the front panel of the device.
2.
Connect the device to a PC via USB.
3.1.4
Configuring the receiver (optional)
The default configuration of the MDR firmware is usable for basic automotive applications. A custom
configuration can be applied using u-center:
1.
Open u-center.
2.
Select the device with
Receiver > Connection > COMXX.
3.
Open the Messages View with
View > Messages View.
4.
Select the UBX-CFG-VALSET message.
5.
Select the configuration item(s) with
Group
and
Key name.
6.
Modify the values and send the message to modify the configuration.
☞
Refer to the NEO-M9V documentation ([2], [3]) for more information about receiver configuration.
3.2
Calibration
Before the receiver can operate in dead reckoning mode, it needs to gather calibration information
from the movements of the vehicle. Although the calibration process will complete eventually during
normal driving, it can be accelerated by doing a calibration drive prior to actual testing. The calibration
drive may speed up the evaluation process considerably.
The calibration drive must be done in an open area, such as a parking lot, under good GNSS signal
conditions. Drive the vehicle to such a place and do the following steps. The progress of calibration
can be monitored in u-center with the UBX-ESF-ALG and UBX-ESF-STATUS messages.
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