Motorola

It’s Not Where You Are, It’s Where You’re Going.

TM

ONCORE ENGINEERING NOTE

M12 Oncore

3. Mechanical

4. Environmental

5. Electrical

6. RF Characteristics of Receiver

7. RF Requirements for Antenna

8. Performance

9. Features

10. Serial I/O Messages

Motorola GPS Products Phone: 888-298-5217 Fax: 847-714-7325 Email: [email protected]

Preliminary Revision 1.0 3/31/99 www.oncore.motorola.com

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1. Preliminary M12 Oncore Product Specifications

General

Characteristics

Receiver Architecture

Performance

Characteristics

Tracking Capability

Dynamics

Acquisition Time

(Time To First Fix, TTFF)

(Tested at -30 to +85 °C)

Positioning Accuracy

Serial

Communication

Timing Accuracy (1PPS)

Antenna

Datum

Output Messages

Electrical

Characteristics

Physical

Characteristics

Power Requirements

"Keep-Alive" BATT Power

Power Consumption

Dimensions

Weight

Connectors

Environmental

Characteristics

Antenna to Receiver

Interconnection

Operating Temperature

Humidity

Altitude

Miscellaneous Standard Features

Optional features

• 12 parallel channel

• L1 1575.42 MHz

• C/A code (1.023 MHz chip rate)

• Code plus carrier tracking (carrier aided tracking)

• 12 simultaneous satellites

• Velocity: 515 m/s (1000 knots); > 515 m/s at altitudes < 18,000 m

• Acceleration: 4 g

• Jerk: 5 m/s 3

• Vibration: 7.7G per Military Standard 810E

• <15 sec. typical TTFF - Hot (current almanac, position, time, ephemeris)

• <40 sec. typical TTFF - Warm (current almanac, position and time)

• <60 sec. typical TTFF - Cold (No stored information)

• <1.0 sec. internal reacquisition (typical)

• 100 meters 2dRMS with SA as per DoD specification

• Less than 25 meters, SEP without SA

• < 500 ns with SA on

• Active micro strip patch Antenna Module

• Powered by Receiver Module (15 mA @ 3 Vdc) (optional 5 Vdc available)

• WGS-84

• One user definable datum

• Latitude, longitude, height, velocity, heading, time

• Motorola binary protocol at 9600 baud

• NMEA 0183 at 4800 baud (GGA, GLL, GSA, GSV, RMC, VTG, ZDA)

• Software selectable output rate (continuous or poll)

• TTL interface (0 to 3 V)

• Second COM port for RTCM input

• 2.75 to 3.2 Vdc; 50 mVp-p ripple (max.)

• External 2.75 Vdc to 3.2 Vdc, 5µA (typical @2.7Vdc)

• <0.225 W @ 3 V without antenna

• 40.0 x 60.0 x 10.0 mm [1.57 x 2.36 x 0.39 in.]

• Receiver 25 g (0.9 oz.)

• Active Antenna Module < 40 g

• Power/Data: 10 pin (2x5) unshrouded header on 0.050 in. centers

(Available in right angle or straight configuration

• RF: Right Angle MMCX (subminiature snap-on)

• Single coaxial cable with 6 dB Maximum loss at L1 (active antenna)

• Antenna Sense Circuit

• -40°C to +85°C

• 95% noncondensing +30°C to +60°C

• 18,000 m (60,000 ft.) maximum

• > 18,000 m (60,000 ft.) for velocities < 515m/s (1000 knots)

• Motorola DGPS corrections at 9600 baud on COM port one

• RTCM SC-104 input Type 1 and Type 9 messages for DGPS at 2400, 4800 or 9600 baud on COM port two

• NMEA 0138 output

• Inverse DGPS support

• Lithium battery



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2.

Basic Description

2.1

Receiver architecture

Channels

Frequency

Code

Tracking

12 parallel

1575.42 MHz

C/A

Carrier aided

2.2

Description

The highly integrated single board GPS receiver module is optimized specifically for automotive applications. The

GPS receiver tracks the NAVSTAR GPS constellation of satellites. The satellite signals received by an active antenna are tracked with 12 parallel channels of L1, C/A code then downconverted to an IF frequency and digitally processed to obtain a full navigation solution of position, velocity, time and heading. The solution is then sent over the serial link via the 10-pin connector.



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3.

Mechanical

3.1.1 M12 Oncore with right angle I/O power/data connector

3.1.2 M12 Oncore with straight I/O power/data connector



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3.2

Size

Dimensions

3.3

Weight

3.4

Connectors

Power/Data

Antenna RF

4.

Environmental

4.1

Temperature

Operating

Storage

4.2

Relative humidity

Operating

4.3

Vibration

40.0 x 60.0 x 10.0 mm

< 25 g

SamTech, FTSH-105-D2-L-DH header, 10 pin, 0.050 inch centers

Sub-miniature MMCX connector type

-40 °C to +85°C

-40 °C to +105°C

5% to 95% non-condensing 30 °C to 60°C

0.04 G 2 /Hz, 20 Hz to 1000 Hz

7.7 G per Military Standard 810E

5.

Electrical

Pin #

7

8

5

6

9

10

3

4

1

2

Signal Description

TTL TXD1

TTL RXD1

+3.0 V PWR

1 PPS

GROUND

BATTERY

Reserved

RTCM IN

Transmit 3 V logic

Receive 3 V logic

+3 V regulated main power

One pulse per second signal

Ground (receiver)

Externally applied backup power (2.7 to 3.2 V)

Not currently used

RTCM input

ANTENNA VOLTAGE 3 V or 5 V antenna input voltage

Reserved Not currently used



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5.2

Main power

Voltage 2.75 to 3.2 Vdc regulated

50 mV maximum peak-to-peak ripple

0.225 W maximum (without antenna) Power

5.3

Backup power

Voltage

Current

Retention

5.6

Serial I/O signal definition

Levels

Baud rate

Parity

Data bits

Start/stop bits

2.7 V to 3.2 V

5 µA typical @ 2.7 V

Backup power retains date, time, position, satellite data and operating mode

5.4

Antenna feed power out of RF connector

Voltage 2.7 V to 3.2 V over current range for 3 V antenna

Current 15 mA to 80 mA

Flags set in serial data when limits exceeded

5.5

1PPS signal definition

Level

Time mark

Width

0 V to 3 V

Rising edge

200 ms typical

0 V to 3 V, active low

9600

None

8

1

6.

RF Characteristics of Receiver

6.1

Dynamic range

6.2

Saturation

27 dB

110 dBm



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7.

RF Requirements for Antenna

7.1

General

Frequency

Bandwidth

Polarization

Impedence

7.2

Gain requirement

7.3

Gain Pattern

7.4

Noise figure

7.5

VSWR

7.6

Axial ratio

7.7

1 dB compression point

7.8

3 dB frequency bandwidth

7.9

25 dB frequency rejection

7.10 Ground plane

7.11 Power

Voltage

1575.42 MHz (L1)

± 1.023 MHz

Right hand circular

50 Ω

10 dB to 26 dB (at receiver input)

+0 dBic minimum at zenith

-10 dBic minimum at 0 ° elevation

1.8 dB typical

2.2 dB maximum

1.5:1 typical

2.5:1 maximum

3 dB typical at zenith

6 dB maximum at zenith

-14 dBm typical (at antenna output)

45 MHz maximum

± 95 MHz

15 x 15 cm recommended

Current

2.75 V to 3.2 V

3.0 V typical

15 mA typical

25 mA maximum

7.12 Temperature

Operating

Storage

-40 °C to +85°C

-40 °C to +100°C



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8.

Performance

8.1

Accuracy

Position

Altitude

Velocity

Time pulse

8.2

Dynamic limits

Velocity

Altitude

25 m SEP without SA

100 m 2DRMS (95%) with SA

1 to 5 m typical in differential mode

156 m RMS (95%)

0.02 m/s without SA

UTC ± 500 ns with SA on

Acceleration

Jerk

515 m/s maximum at altitudes > 18 000 m

-1 000 m minimum

18 000 m maximum at velocities > 515 m/s

4 G maximum

5 m/s 3 maximum

8.3

Startup time (TTFF)

Hot (date, time, position, almanac and ephemeris)

Warm (date, time, position and almanac)

Cold (no stored information)

50% 90%

15 s

40 s

60 s

30 s

65 s

210 s

8.4

Reacquisition time

After 60 s obstruction

Internal

8.5

RFI

Jamming resistance

2.0 s

< 1.0 s

Burnout protection

Resistant to narrow band CW jamming at the receiver input of +20dBm at less than 1525 MHz and greater than 1625 MHz for loss of lock with a signal input of –130 dBm

Protected from damage by RF signals at frequencies

100 MHz or more from L1 with received power up to

1 W at the antenna

8.6

EMI

Radiated

Conducted

Complies with Class B, Part 15 of FCC rules

Complies with European CE requirements

Tested to IEC 801-4 spec for fast transients at 500 V, 5/50 ns, 5 kHz



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9.

Features

9.1

Differential operation

Motorola binary corrections on TTL RX1

RTCM SC-104 Type 1 and Type 9 corrections on TTL RX2

9.2

NMEA 0183 output

NMEA 0183

Messages supported

Output on TTL TX1 at 4800 baud

GGA, GLL, GSA, GSV, RMC, VTG, ZDA

9.3

User definable datum

One user definable datum may be defined using the @@Ap command. The default datum is WGS-84.

9.4 Antenna sense circuit

The M12 Oncore receiver is capable of detecting the presence of an antenna. The receiver utilizes an antenna sense circuit, which can detect under current (open) and over current (shorted or exceeding maximum limit) conditions. The status of the antenna circuit is reported in the Position/Status/Data (@@Ha), the Short

Position Message (@@Hb) and the Self-Test Message (@@Ia).

The antenna sense circuit is useful for verifying that the antenna is properly connected to the receiver and is drawing the proper amount of current. The antenna sense status should be checked after installation and monitored regularly.

Undercurrent indication

Overcurrent indication

< 8 mA

> 80 mA

9.5

Real time clock

The real-time clock (RTC) is a standard feature on the M12 Oncore. It is used to minimize the time to first fix

(TTFF). The date and time will be retained in the RTC if battery backup power is applied when main power is off.

The user has two options regarding time initialization:

1) Set the date and time BEFORE the receiver acquires any satellites

2) Let the receiver automatically set the date and time AFTER acquiring the first satellite

Note: The date and time cannot be manually set while the receiver is tracking satellites.

Without battery backup, the receiver will start-up with a default time of 12:00:00. To obtain a faster time to first fix, the time, date and GMT offset should be initialized if both the main power and battery backup power have been disconnected.



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10.

Serial I/O Messages

10.1 Solution

Update rate

Latency

Reported

Reference

10.2 Resolution

Latitude/longitude

Height

Velocity

Heading

Time

10.3 Solution quality indicators

Receiver status

Geometry

Satellite status

1 Hz

< 1 s

Position, velocity, time, satellite status, receiver status, antenna status

WGS-84 or user defined datum

1 milliarcsecond

0.01 m

0.01 m/s

0.1

°

1 ns

3D, 2D, propagation, acquisition

HDOP when in 2D mode

PDOP when in 3D mode

C/No (dB)

Flag indicating satellite tracking status

Flag indicating satellite is used in solution

10.4 Initialization

Startup mode

Battery backup provided

No battery backup

Default condition

Acquisition based on information available

No initialization required

Receiver will be in default condition, entering date, time, position and almanac will speed up acquisition process

No serial messages active unless there is a power-on self-test failure

(see Oncore User’s Guide)



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10.5 Motorola binary I/O command list

Motorola binary commands can be used to initialize, configure, control, and monitor the GPS receiver. The

Motorola binary commands are supported on the primary communications port at 9600 baud. The commands supported by the M12 Oncore are:

Ag Satellite Mask Angle

Ao Datum ID Codes

Ap User Defined Datums

Aq Ionospheric Correction Option

As Hold Position Parameters

Au Altitude Hold Height

Ay 1-PPS Time Offset

Az 1-PPS Cable Delay

AM Position Lock Parameters Message

AN Marine Filter Message

AQ Position Filter Select

AS Position Lock Select Message

Bb Visible Satellite Data Message

Be Almanac Data Request [response is Cb]

Bo UTC Offset Output Message

Cb Almanac Data (output) [response to Be] or

Almanac Data (input) [response is Ch]

Cf Set To Defaults

Ch Almanac Data Response [response to Cb]

Ci

Cj

Switch I/O Format

Receiver ID

Ck Pseudo-Range Correction Input [response to Ce]

Eq ASCII Position Message

Ga Position Message

Gb Time Message

Gd Position Control Message

Gj Leap Second Pending

Gk Vehicle ID

Ha Position/Status/Data (12 Channel)

Hb Short Position Message

Ia Self-Test Message (12 Channel)



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10.6 NMEA Commands

The M12 Oncore supports NMEA 0183 at 4800 baud on the primary communications port. Each of the supported commands can be output at user selectable update rates. The NMEA commands supported are:

GGA GPS Fix Data

GLL Geographic Position-Latitude/Longitude

GSA GPS DOP and Active Satellites

GSV GPS Satellites in View

RMC Recommended Minimum Specific GPS/Transit Data

VTG Track Made Good and Ground Speed

ZDA Time and Date

FOR Switch to Motorola binary

10.7 RTCM Commands

The M12 Oncore accepts RTCM SC-104 Type 1 and Type 9 messages. The messages are input on the second communications port (pin 8) at a user selectable baud rate of 2400, 4800 or 9600. The RTCM messages are buffered and processed independently from the primary communications port.



Page 12 of 12

Motorola | F5217A | User manual | ONCORE TECHNICAL APPLICATION NOTE

ONCORE ENGINEERING NOTE

M12 Oncore

3. Mechanical

4. Environmental

5. Electrical

6. RF Characteristics of Receiver

7. RF Requirements for Antenna

8. Performance

9. Features

10. Serial I/O Messages

**1. Preliminary M12 Oncore Product Specifications**

2.

Basic Description

3.

Mechanical

4.

Environmental

5.

Electrical

6.

RF Characteristics of Receiver

7.

RF Requirements for Antenna

8.

Performance

9.

Features

10.

Serial I/O Messages

Related manuals

Motorola | F5217A | User manual | ONCORE TECHNICAL APPLICATION NOTE

ONCORE ENGINEERING NOTE

M12 Oncore

3. Mechanical

4. Environmental

5. Electrical

6. RF Characteristics of Receiver

7. RF Requirements for Antenna

8. Performance

9. Features

10. Serial I/O Messages

1. Preliminary M12 Oncore Product Specifications

2.

Basic Description

3.

Mechanical

4.

Environmental

5.

Electrical

6.

RF Characteristics of Receiver

7.

RF Requirements for Antenna

8.

Performance

9.

Features

10.

Serial I/O Messages

Related manuals

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Motorola

M12 Oncore

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NORTHSTAR

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**1. Preliminary M12 Oncore Product Specifications**