DSP-14-8-082/A/EW Page 1 of 31
DRAFT SPECIFICATION
Part No. : GRS.01.A.024KSSX1
Product Name : Stealth GPS/GNSS/Beidou Smart Antenna Receiver
System
Features : Covers GPS, GLONASS, GALLILEO, Beidou, and QZSS
Combines low power consumption and high sensitivity
Integrates u-blox new M8 semiconductor platform
Easy integration on UAV with APM 2.x platform
Capable 1° to 2° Compass heading accuracy
Uses a High IIP3, High Gain, and Low Noise Amplifier
Includes ESD protection 15KV (Air)
Compass I2C Interface
Wide Magnetic Field Range (+/-8 Oe)
Fast 160 Hz Maximum Output Rate for Compass
Dimensions: 64.5mm*60.0mm*178.1mm
RoHS Compliant
DSP-14-8-082/A/EW Page 2 of 31
1. Introduction
The GRS.01 GPS/Glonass/Beidou smart antenna receiver system is a complete
receiver and antenna based on the u-Blox M8 solution. It is the most advanced small
form factor smart antenna receiver system on the market today.
Featuring the u-blox M8 multi-GNSS (GPS, GLONASS, Beidou, QZSS and SBAS)
engine, the MAX-8 series delivers high sensitivity and minimal acquisition times in the
industry proven MAX form factor. A wide-band, specially tuned, advanced 35mm
dielectric ceramic patch antenna is integrated directly with the receiver for best
receive sensitivity.
In addition, an electronic compass function is included for direction finding.
This system allows continuous position coverage in most application environments.
Furthermore, it’s very easy to operate this antenna via I2C serial bus, since the
protocols and commands support APM version 2.x which is popular in drone UAV
application field.
Typical Applications
- Navigation-Automotive/Pedestrian/Marine
- Positioning-Geotagging/Journey/LBS
- Tracking-Security/Safety
- Asset Tracking
- First Person View applications
- Other location-aware consumer devices
If you have any questions, please Contact your regional Taoglas office for support
DSP-14-8-082/A/EW Page 3 of 31
2. Specification Table
ELECTRICAL
Receiver Type
72-channel u-blox M8 concurrent GNSS receiver
GPS/QZSS L1 C/A, GLONASS L10F,BeiDou B1,
SBAS L1 C/A: WAAS, EGNOS, MSAS
GPS+GNSS GPS+BEIDOU GPS
TTFF
Cold start 26s 27s 29s
Hot start 1s 1s 1s
Aided Starts 2s 3s 2s
Sensitivity
Tracking &
Navigation -167 dBm -165 dBm -166 dBm
Reacquisition -160 dBm -160 dBm -160 dBm
Cold Start: -148 dBm -148 dBm -148 dBm
Hot Start -156 dBm -156 dBm -156 dBm
Horizontal position accuracy Autonomous :2.5m
SBAS :2.0m
Accuracy of time pulse signal RMS:30ns
99%:60ns
Frequency of time pulse
signal Configurable 0.25 Hz to 10 MHz (config)
Max navigation update rate Single GNSS: up to 18 Hz
Concurrent GNSS: up to 10 Hz
Velocity accuracy 0.05 m/s
Heading accuracy 0.3 degrees
Altitude 50000m
Velocity 500m/s
Schmitt trigger input SCL &
SDA
Fall 0.2*VDDIO (VDDIO = 1.8V)
Rise 0.8*VDDIO (VDDIO = 1.8V)
Digital IO Low level input 0 ~ 0.2*VCC_IO (VCC = 5.0V typical)
Digital IO High level input 0.7*VCC_IO ~ VCC_IO+0.5 (VCC = 5.0V typical)
Digital IO Low level output 0.4 V (lol = 4mA)
DSP-14-8-082/A/EW Page 4 of 31
Digital IO High level output VCC_IO–0.4 V (lol = 4mA)
Max. Input Power at RF_IN 15 dBm
Power Consumption DC 4V-6V (5V Typical)
DC 30mA-50mA (40mA Typical)
Center Frequency GPS
1575.42MHz
GNSS
1602MHz
Beidou
1561MHz
Return Loss 10.26 dB -23.32 dB -10.48 dB
V.S.W.R 2.05 1.24 1.93
Antenna Gain
-1.19 dBi(typ.)
@ Zenith XZ
-0.51 dBi(typ.)
@ Zenith YZ
1.13 dBi(typ.)
@ Zenith XZ
1.33 dBi(typ.)
@ Zenith YZ
-1.41 dBi(typ.)
@ Zenith XZ
0.23 dBi(typ.)
@ Zenith YZ
Axial Ratio 9.19 19.47 20.26
MECHANICAL
Housing Material ABS
Cable UART TTL serial bus (GPS/GLONASS/BEIDOU)
UART I2C serial bus (COMPASS)
Connector 1.25mm Wafer Horizontal SMT Single Row 04 & 05 contacts
Stand 164mm*39mm
Weight 55g
ENVIRONMENTAL
Operation Temperature -40°C ~ +85°C
Storage Temperature -40°C ~ +90°C
DSP-14-8-082/A/EW Page 5 of 31
3. Electrical Specifications
3.1. System Block Diagram
3.2. Return Loss
–10.48 dB@1561MHz
–10.26 [email protected]
–23.32 [email protected]
DSP-14-8-082/A/EW Page 6 of 31
3.3. Impedance
Impedance:28.63–j4.28Ohm
Impedance:74.81–j24.85Ohm
Impedance:52.80+j5.13Ohm
DSP-14-8-082/A/EW Page 8 of 31
3.5. Radiation Pattern
DSP-14-8-082/A/EW Page 9 of 31
3.5.1. 1561MHz
XZ-Plane
Peak Gain Zenith Gain
-1.03 dBi -1.41 dBi
DSP-14-8-082/A/EW Page 10 of 31
YZ-Plane
Peak Gain Zenith Gain
0.38 dBi 0.23 dBi
DSP-14-8-082/A/EW Page 11 of 31
Gain Pattern Value
Angle XZ-Plane YZ-Plane
90° -4.82 -4.10
75° -4.46 -3.05
60° -3.75 -2.55
45° -3.02 -2.45
30° -2.37 -2.02
15° -1.81 -0.76
0° -1.41 0.23
345° -1.04 0.06
330° -1.14 -0.75
315° -1.72 -0.13
300° -2.82 0.17
285° -4.21 -1.41
270° -5.36 -2.77
DSP-14-8-082/A/EW Page 12 of 31
3.5.2. 1575.42MHz
XZ-Plane
Peak Gain Zenith Gain
-1.03 dBi -1.41 dBi
DSP-14-8-082/A/EW Page 13 of 31
YZ-Plane
Peak Gain Zenith Gain
0.38 dBi 0.23 dBi
DSP-14-8-082/A/EW Page 14 of 31
Gain Pattern Value
Angle XZ-Plane YZ-Plane
90° -3.25 -8.95
75° -3.19 -6.48
60° -2.85 -4.25
45° -2.37 -2.66
30° -1.89 -1.54
15° -1.47 -0.77
0° -1.19 -0.51
345° -1.05 -1.33
330° -1.27 -2.63
315° -1.86 -3.67
300° -2.74 -4.65
285° -3.65 -6.47
270° -4.30 -7.53
DSP-14-8-082/A/EW Page 15 of 31
3.5.3. 1602.6MHz
XZ-Plane
Peak Gain Zenith Gain
-1.03 dBi -1.41 dBi
DSP-14-8-082/A/EW Page 16 of 31
YZ-Plane
Peak Gain Zenith Gain
0.38 dBi 0.23 dBi
DSP-14-8-082/A/EW Page 17 of 31
Gain Pattern Value
Angle XZ-Plane YZ-Plane
90° -3.16 -3.87
75° -1.86 -1.72
60° -0.72 -0.71
45° 0.20 -0.18
30° 0.87 0.46
15° 1.25 1.19
0° 1.31 1.33
345° 0.88 -0.37
330° 0.04 -1.40
315° -1.16 0.15
300° -2.71 0.45
285° -4.53 -1.60
270° -6.28 -2.81
DSP-14-8-082/A/EW Page 18 of 31
3.6. Axial Ratio
3.6.1. 1561MHz
Angle Axial Ratio
90° 12.76
75° 10.98
60° 16.34
45° 8.73
30° 21.74
15° 13.00
0° 20.26
345° 14.42
330° 24.00
315° 18.98
300° 20.69
285° 17.01
270° 15.01
DSP-14-8-082/A/EW Page 19 of 31
3.6.2. 1575.42MHz
Angle Axial Ratio
90° 13.45
75° 11.26
60° 10.68
45° 10.50
30° 9.94
15° 11.10
0° 9.19
345° 13.18
330° 10.68
315° 16.74
300° 10.38
285° 23.00
270° 16.67
DSP-14-8-082/A/EW Page 20 of 31
3.6.3. 1602.6MHz
Angle Axial Ratio
90° 20.24
75° 9.83
60° 3.53
45° 2.73
30° 9.91
15° 15.45
0° 19.47
345° 11.19
330° 7.15
315° 5.87
300° 11.46
285° 20.46
270° 34.80
DSP-14-8-082/A/EW Page 21 of 31
4. Mechanical Specifications
4.1. Enclosure Dimensions (60*64.5*178.14 mm)
DSP-14-8-082/A/EW Page 22 of 31
4.2. Cable Definition
Color Description
Blue SDA
Orange SCL
Black GND
Red VCC
Green TX (Input)
Yellow RX (Output)
Vcc Range:4V~6V Typ:5V
Current Range:30mA~50mA Typ:40mA
DSP-14-8-082/A/EW Page 23 of 31
4.3. Connector Drawings
DSP-14-8-082/A/EW Page 24 of 31
4.4. Outdoor Test (Smart Antenna on Device)
This is a screen shot of UAV controller. The image shows the GRS.01 is functional with
fixed GPS 3D position, Hdop and Sat value.
DSP-14-8-082/A/EW Page 25 of 31
5. Protocols
5.1. NMEA Output Sentences
Its output signal level is TTL. It can support the following NMEA-0183
Messages: GGA, GLL, GSA, GSV, RMC and VTG. NMEA Output Messages: the Engine
board outputs the following messages as shown in Table1
Table1:NMEA-0183 Output Messages
NMEA Record Description
GGA Global positioning system fixed data.
GLL Geographic-latitude/Longitude
GBS system ID, signal ID
GNS nav status
GRS system ID, signal ID
GSA GNSS DOP and active satellites
GSV GNSS satellites in view
RMC Recommended minimum specific GNSS data
VTG Course over ground speed
DSP-14-8-082/A/EW Page 26 of 31
Table-2 contains the values for the following example:
$GPGGA,022043.00,2312.16435,N,14029.45462,E,1,06,2.74,65.4,M,19.2,M,,*61
Table-2:GGA Data Format
Name Example Units Description
Message ID $GPGGA GGA protocol header
UTC Time 022043.0
0 hhmmss.sss
Latitude 2312.164
35 ddmm.mmmm
N/S Indicator N N=north or S=south
Longitude 14029.45
462 dddmm.mmmm
E/W Indicator E E=east or W=west
Position Fix
Indicator 1 See Table-3
Satellites Used 06 Range 0 to 14
HDOP 2.74 Horizontal Dilution of
Precision
MSL Altitude 65.4 Meters
Antenna Altitude
above/below
mean-sae-level
Units M Meters Units of antenna altitude
Geoidal
Separation 19.2 Meters
Units M Meters Units of geoid separation
Age of Diff.Corr. Second Null field when DGPS is not
used
Checksum *61
<CR><LF> End of message
termination
DSP-14-8-082/A/EW Page 27 of 31
Table-3:Position Fix Indicator
Value Description
0 Fix not available
1 GPS fix
2 Differential
DSP-14-8-082/A/EW Page 28 of 31
GSA-GNSS DOP and Active Satellites
Table-4 contains the values for the following example:
$GPGSA,A,3,10,21,26,15,18,09,06,10,,,,,1.62,0.95,2.37*00
Table-4:GSA Data Format
Name Example Units Description
Message ID $GPGSA GSA protocol header
Mode 1 A See Table-5
Mode 2 3 See Table-6
Satellite Used 10 SV on channel 1
Satellite Used 21 SV on channel 2
…. …. …. ….
Satellite Used SV on channel 12
PDOP 1.62 Position Dilution of
Precision
HDOP 0.95 Horizontal Dilution of
Precision
VDOP 2.37 Vertical Dilution of
Precision
Checksum *00
<CR><LF> End of message
termination
Table-5 Mode 1
Value Description
M Manual-forced to operate in 2D or 3D
A 2D Automatic-allowed to automatically switch 2D/3D
Table-6 Mode 2
Value Description
1 Fix not available
2 2D(<4 SVs used)
3 3D(≧4 SVs used)
DSP-14-8-082/A/EW Page 29 of 31
GSV—GNSS Satellites in View
Table-7 contains the values for the following example:
$GPGSV,3,1,09,29,36,029,42,21,46,314,43,26,44,020,43,16,25,124,39*7D
$GPGSV,3,2,09,18,26,314,40,09,57,170,44,06,20,229,37,10,26,084,
$GPGSV,3,3,09,07,,,26*73
Table-7:GSV Data Format
Name Example Units Description
Message ID $GPGSV GSV protocol
Number of
Messages 3
Range 1 to 3
(Depending on the number
of satellites tracked,
multiple messages of
GSV data may be
required.)
Message
Number1 1 Range 1 to 3
Satellites on View 09
Satellite ID 29 Channel 1(Range 1 to 32)
Elevation 36 Channel 1(Maximum 90)
Azimuth 029 Channel 1(True, Range 0 to
359)
SNR(C/No) 42 Range 0 to 99,
(null when not tracking)
…. …. …. ….
Satellite ID 16 Channel 4(Range 1 to 32)
Elevation 25 Channel 4(Maximum 90)
Azimuth 125 Channel 4(True, Range 0 to
359)
SNR(C/No) 39 Range 0 to 99,
(null when not tracking)
Checksum *7D
<CR><LF> End of message
termination
DSP-14-8-082/A/EW Page 30 of 31
RMC—Recommended Minimum Navigation Information
Table-8 contains the values for the following example:
$GPRMC,064951.000,A,2307.1256,N,12016.4438,E,0.03,165.48,260406,
3.05,W,A*55
Table-8 RMC Data Format
Name Example Units Description
Message ID $GPRMC RMC protocol header
UTC 064951.0
00 hhmmss.ss
Status A A=date valid or V=date not
valid
Latitude 2307.125
6 ddmm.mmmm
N/S Indicator N N=North or S=South
Longitude 12016.44
38 dddmm.mmmm
E/W Indicator E E=East or W=West
Speed over
Ground 0.03 Knots
Course over
Ground 165.48 Degrees True
Date 260406 ddmmyy
Magnetic
Variation 3.05,W degrees E=East or W=West
Mode A
A=Autonomous mode
D=Differential mode
E=Estimated mode
Checksum *55
<CR><LF> End of message
termination
DSP-14-8-082/A/EW Page 31 of 31
VTG—Course and speed information relative to the ground
Table-9 contains the values for the following example:
$GPVTG,165.48,T,,M,0.03,N,0.06,K,A*37
Table-9 VTG Data Format
Name Example Units Description
Message ID $GPVT VTG protocol header
Course 165.48 degrees Measured heading
Reference T True
Course degrees Measured heading
Reference M Magnetic
Speed 0.03 Knots Measured horizontal speed
Units N Knots
Speed 0.06 Km/hr Measured horizontal speed
Units K Kilometers per hour
Mode A
A=Autonomous mode
D=Differential mode
E=Estimated mode
Checksum *06
<CR><LF> End of message
termination