Compact & High-sensitive GPS Speedometer

LC-8300

 

 


LC-8300 小型高感度GPS速度計

 

LC-8300 compact and high-sensitive GPS speedometer can measure speed, distance and other vehicle-related measurement items for two-wheel vehicles, or construction vehicles etc. by satellite signals of GPS/GLONASS.


Features

High-sensitive receiver:Allows the GPS/GLONASS antenna to be installed inside a vehicle for measurement.
Compact design:170×120×41(mm) and approx.0.75 kg of the main unit, built-in IMU, only three units (main unit, display and antenna) are necessary to measure.
Data logging without a PC:Data can be stored in the attached USB memory or internal storage memory.
Easy to operate with a touch panel:The touch panel display improves visibility and ease of operation.
High accuracy:Accuracy of ±0.2 km/h or less(speed), and ±0.2 % or less (distance)
High function:

- Analog 4ch, pulse 1ch, CAN 64ch input as standard
- Selectable output (analog output of speed / pulse output of distance)
- ±20 V voltage input (4ch), pulse input (1ch)
- Carrying case as standard accessory
- Measurement result can be printed out by a printer.
- Update cycle: 10 ms
- Condition display of a main unit by LED
- Buzzer to inform the lost of satellite reception
- External trigger processing
- Data transmission by CAN communication
- Interpolation of speed data by CAN or pulse signal
- Can be used LC-8000 series software
- Tri-axial accelerometer, angular speed measurement
- Data output as CSV format

LC-8300 Promotion movie (YouTube)

High accuracy data measurement
– principle of speed measurement using GPS –

The LC-8300 compact & high-sensitive GPS speedometer calculates speed by using Doppler effect of the carrier waveform from GPS satellites.

The Doppler effect is the phenomena that is observed whenever the source of waves such as radio wave, light wave, or sound wave is moving with respect to an observer. The frequency will be high when the observer is approaching to the source, and low frequency when the source is receding.

The following formulas show the Doppler effect of the radio wave and light wave.


Carrier wave frequency of GPS satellites is controlled very precisely. Measuring the frequency and applying it to the above formula derives the speed V.
However, the ground speed cannot be measured by the carrier wave frequency of only one GPS satellite because GPS satellite is moving at high speed, and also has the effect of the rotation of the earth. Therefore the LC-8300 uses carrier waves from multiple GPS satellites (more than four) to measure the frequency as shown below, and then calculates the speed of the moving object by the same way of positioning measurement method.

In this method, the speed of the moving object can be calculated extremely more precisely than the calculation method using the amount of position change, because it receives almost none of the influence from the ionosphere.

The accuracy of its horizontal component is 0.003 m/s when 2 σ, 0.08 m/s when 3 σ. However, it shall not apply to the accuracy of the vertical components. As for the accuracy of the vertical component, the accuracy turns worse approx. 3 times in comparison with the accuracy of the horizontal components because it receives a satellite signal from only a single direction. From the image above, you can see that the moving object is receiving the radio waves of various Doppler shift frequencies from multiple satellites.

The formulation of these relationships is as follows.

 

Δ fd1 = 1/ λ (V0 - V1)· u1
Δ fd2 = 1/ λ (V0 - V2)· u2
Δ fd3 = 1/ λ (V0 - V3)· u3
Δ fd4 = 1/ λ (V0 - V4)· u4
Δ fd5 = 1/ λ (V0 - V5)· u5

 

λ is wavelength of carrier waveform radiated from a satellite; approx. 0.19m, fb represents clock error of a receiver; (Hz), and un (n = 1..5)shows visual direction unit vector of a satellite and a receiver position. Those can be calculated by the following formulas.

un =ρ n/| ρ n| (n = 1..5)
ρ n =[ (Npn - Np0), ( Epn - Ep0), ( Dpn - Dp0)]T (n = 1..5)

The speed of a moving object can be calculated by solving Vo with these formulas.

Stable measurement
– Correction processing by IMU –

A big noise is occurred in speed output of the Doppler method on a public road in city area. Because there are enough obstacles to give the influence of multi-path on the measurement such as trees or buildings as shown below. In addition, the speed measurement using GPS alone cannot be performed when the vehicle passes the place that satellite signal cannot be captured, like the viaduct.

 

Even under the multi-path environment, combining the speed information from GPS and tri-axial accelerometers of IMU/tri-axial gyro with appropriate ratio derives more precise and much smoother speed data output than that of one GPS as is shown below.

 

Also, interpolation by IMU helps high accurate speed data output at the place where the measurement in GPS alone is not possible in the cases such that a vehicle passes under a viaduct.

 

System configuration


Software Options for Hardware/PC test

LC-8300 Compact & high sensitivity GPS speedometer
Hardware test function (PC-less)   PC Test software

Minimum component:main unit, antenna, display, remote control
Data stored to:main unit or USB memory

 

Minimum component:Main unit, antenna, PC
Data stored to:PC hard disc

Starting acceleration LC-0827
Hardware acceleration test function
  Starting acceleration LC-0831
Acceleration/deceleration test software
Passing acceleration   Passing acceleration
MFDD LC-0828
Hardware brake test function
  MFDD
ABS   ABS
Fade recovery   -
Coasting LC-0829
Hardware coasting test function
  Coasting
    Constant-speed fuel consumption LC-0832
Fuel consumption test software
    Fuel consumption at test mode

※:All test functions listed above are options.

Display example of hardware test measurement

1. Starting acceleration test

Measures the arrival time from a vehicle stop point to the specified speed point or the distance with quick acceleration.
Historical data can be monitored.

2. Passing acceleration test

Measures the arrival time from the specified speed to the second specified speed point with quick acceleration.
Historical data can be monitored.

3. Brake test (MFDD)

Measures time, distance and braking initial speed from vehicle start with initial speed to the vehicle stop by sudden braking.
Checks deceleration speed calculated from each parameter, historical data can be monitored.

4. Brake test (ABS)

Sets and measures the interval vehicle speed in braking test.

Checks deceleration speed calculated from each parameter, historical data can be monitored.

5. Brake test (fade recovery)

Measures MFDD by repeated braking tests.
Checks deceleration speed calculated from each parameter, historical data can be monitored.

6. Coasting test

Measures time and speed of freewheeling from the speed over the specified speed to the vehicle stop point.
Checks CD value calculated from each parameter, historical data can be monitored.

Specification

Measurement accuracy Horizontal speed Measurement range/ accuracy 0.1 to 500.0 km/h/±0.2 km/h or less (Horizontal speed 30 km/h or more, when 7 or more of satellite acquisition)
Horizontal distance Accuracy ±0.2 % (forward distance 300 m, horizontal speed 30 km/h or more, when 7 or more of satellite acquisition)
Standard measurement item Horizontal speed (km/h), horizontal distance (m), time (s), UTC time, number of satellite capture, HDOP(Horizontal Dilution of Precision), Heading (°), North speed (km/h), East speed (km/h), North distance (m), East distance (m), travelling distance (m), latitude (dms), longitude (dms), altitude (m )
Optional measurement item Lateral distance (m), vertical speed (km/h), vertical distance (m), VDOP(Vertical Dilution of Precision) , lateral sideslip amount (m), roll angle (°), pitch angle (°), yaw angle (°), X acceleration (m/s2), Y acceleration (m/s2), Z acceleration (m/s2), X angular speed (°/s), Y angular speed (°/s), Z angular speed (°/s), gradient (%)
Update (output)frequency 100 Hz
General specification Hardware Power requirement DC 9 to 28 V (non-isolation), AC 100 to 240 V (AC adapter used:option)/ 12 VA max (DC power input, when connected peripheral devices)
Operating/storage temperature 0 to 50 ℃ / -10 to 60 ℃ (humidity 20 to 80 %RH, with no condensation)
Outer dimensions /mass Approx. 170 × 120 × 40 mm (not including protruded section) approx. 0.75 kg
Display unit Outer dimensions /mass Approx. 150 × 100 × 100 mm (not including protruded section) approx. 0.5 kg
Remote Outer dimensions /mass Approx. 120 x 50 x 20 mm (not including protruded section) approx. 0.08 kg
Antenna Outer dimensions /mass Approx. 66×50×22 mm (antenna section) approx. 0.1 kg
Protection class IP67
Output Speed analog output Range 0 to 10 V
SI Units:0 to 10 V/0 to 500.0 km/h
mile units:0 to 10 V/0 to 250.0 mile/h
Load resistance 10 kΩ or more
Distance pulse output Resolution SI Units:10, 5, 1 mm/pulse
mile Units:16.0934, 8.0467, 1.6093 Selectable from mm/pulse
Output delay time 10 ms or less
Output signal Square wave pulse output Hi 5 V ± 0.5 V Lo 0.5 V or less
Duty 50 % ± 10 %
Load resistance Load 10 kΩ or more
Remarks Selectable from voltage or pulse, output from HORIZONTAL SPEED connector on the side
Input Voltage input Number of channels 4
Resolution 16
Range ±20 V
Cutoff frequency 50 Hz
Others The function to set measurement start· stop trigger by voltage value
CH1:measurement start trigger
CH2:measurement stop trigger
Pulse input Number of channels 1
Input coupling AC or DC
Function Pulse count/frequency/duty
Input waveform AC selected:sine wave
DC selected:square wave
Remarks Input by connecting an option cable to the AUX connector on the side to input
CAN Common specification Baud rate 125 k, 250 k, 500 k, 1000 k bps
Protocol Conforms to CAN Ver2.0B
Input Input port 2 (port A, port B)
Number of data acquisition 32ch/1 port (64ch max.)
Others CAN input should be selected at port B side.
Output※1 Output update interval; Selectable from OFF/1 Hz/2 Hz/5 Hz/10 Hz/20 Hz/100 Hz
Output item (standard) Horizontal speed (km/h), speed unit, horizontal distance, (m), UTC time, number of satellite acquisition, trigger of start· stop· reset, GATE status, internal condition, accuracy condition, HDOP (Horizontal Dilution of Precision), Heading (°), latitude (dms) , longitude (dms), altitude (m)
Output item (option) Vertical velocity (km/h), vertical distance, (m), VDOP (Vertical Dilution of Precision), drift amount (m), roll angle,  (°), pitch angle (°), yaw angle (°),
X acceleration (m/s2), Y acceleration (m/s2), Z acceleration (m/s2), X angular speed (°/s), Y angular speed (°/s), Z angular speed (°/s), gradient (%)
Others CAN input function at B port side is not available when the output function is ON.
Remarks Input by AUX connector on the side with optional cable
Other function Buzzer, external trigger input, DC12 V output for general-purpose sensor, condition memory, print by optional printer, storage function
Test function Basic test function of hardware Normal measurement, Interval measurement test
Optional test function of hardware Starting acceleration test, passing acceleration test, brake test (MFDD), brake test (ABS), fade recovery test, coasting test
Basic function of the PC application※2 Basic function (setting of hardware, display of PC measurement result, and so on.)
Optional function of the PC application※2 Acceleration/deceleration test software, Fuel consumption test software, Track display software
Accessory
 
Product name Amount
Touch panel display unit (3.0 m cable attached) 1
Remote box (2.0 m cable attached) 1
GPS/GLONASS antenna 1
Power cable for cigarette light socket (3.0 m) 1
Pin jack ⇔ BNC cable (2.0 m) 2
USB cable for PC connection (1.5 m) 1
CAN branch cable (0.35 m) 1
USB memory 1
Installation CD 1
Instruction manual 1
Carrying case 1
Mount adapter for display unit 1
Base plate for mount adapter 1

 

Option

<Main unit side>

Product name Model name
Power cable (for battery) LC-0082
km/mile selection function LC-0824
IMU data output function (attached to compact IMU【LC-0087】) LC-0825
Vertical direction measurement function LC-0826
Hardware acceleration test function LC-0827
Hardware brake test function LC-0828
Hardware coasting test function LC-0829
CAN output function LC-0854
CAN terminal register adapter LC-0861
CAN branch cable (2m) LC-0862
CAN-OBD2 cable LC-0863
Tape switch LC-0864
Compact thermal printer DPU-414
AC adapter for printer PW-C0725-W1-U
Thermal paper for printer TP-0411
AC adapter for main unit PS-P20018A
AC adapter cable VM1072-VM1700
(For Japan use)

<Software for PC side>

Product name Model name
Acceleration/deceleration test LC-0831
Fuel Consumption test LC-0832
Orbit display LC-0833

 

*1:Option

*2:Refer to the following PC operating environment.

PC operating environment

OS Windows®XP(sp3)/ 7 [32/64 bit]
Memory 1G or more
HDD 80 GB or more
CPU Intel CoreTM2 Duo 2 GHz or more
Display XGA (1024X768 )or more
USB USB2.0 (high speed) 1 port or more (USB3.0 not supported)
Optical drive Optical drive which can read DVD-R and CD-R is necessary for installation and updating.

* Windows® XP, Windows Vista® , Windows® 7 are registered trademarks of Microsoft Corporation in the United States and other countries.
* Intel, Intel logo, Intel Core, Core Inside are trademarks of Intel Corporation in the United States and other countries.
* Other product names and model names are trademarks or registered trademarks of each individual company. The copyrights are reserved by each individual company.

Other options

LC-0864
Tape switch
DPU-414
Digital printer
LC-0866
Input/output cable
Tape SW DPU-414

Revised:2017/04/13



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