Motorola M12 Oncore User's Guide download pdf (Page 15)

Chapter 3 – Receiver Description

Motorola GPS Products - Oncore User’s Guide

GT+ ONCORE RECEIVER TECHNICAL CHARACTERISTICS

Table 3.4: Oncore Technical Characteristics – GT Plus Model

Receiver Architecture 8 parallel channel

L1 1575.42 MHz

C/A code (1.023 MHz chip rate)

Code plus carrier tracking (carrier aided tracking)

General

Characteristics

Tracking Capability 8 simultaneous satellite vehicles

Dynamics Velocity: 1000 knots (515 m/s); > 1000 knots at altitudes < 60,000 ft.

Acceleration: 4g

Jerk: 5 m/s

Vibration: 7.7G per Military Standard 810E

Acquisition Time

(Time To First Fix, TTFF)

(Tested at –30 to +85ºC)

< 15 s typical TTFF-hot (with current almanac, position, time and

ephemeris)

< 45 s typical TTFF-warm (with current almanac, position, and time)

< 90 s typical TTFF-cold

< 1.0 s internal reacquisition (typical)

Positioning Accuracy 100 m 2dRMS with SA as per DoD specification

Less than 25 m SEP without SA

1-5 m typical in differential mode

Timing Accuracy

(1 Pulse Per Second, 1 PPS)

< 500 ns (1 sigma) with SA on

Antenna Active micro strip patch antenna module

Performance

Characteristics

Datum WGS-84

One user definable datum

Serial

Communication

I/O Messages Latitude, longitude, height, velocity, heading, time

Motorola binary protocol at 9600 baud

NMEA at 4800 baud: GGA, GLL., GSA, GSV, RMC, VTG,ZDA

Software selectable output rate (continuous or poll)

TTL interface (0 to 5 V)

Second COM port for RTCM input

Power Requirements

5 ± 0.25 V; 50 mVp-p ripple (max)

“Keep-Alive” BATT Power External 2.5 V to 5.25 V; 5 uA typical @ 2.5 V

Electrical

Characteristics

Power Consumption <0.9 W @ 5 V with active antenna drawing 20 mA

Dimensions 2.00 x 3.25 x 0.64 in. (50.8 x 82.6 x 16.3 mm)

Weight 1.8 oz (51g)

Connectors Data/power: 10 pin (2x5) unshrouded header on 0.100 in, centers

RF: right angle OSX (subminiature snap-on)

Physical

Characteristics

Antenna to Receiver

Interconnection

Single coaxial cable

Antenna sense circuit

Operating Temperature -40ºC to +85ºC

Humidity 95% noncondensing +30ºC to +60ºC

Environmental

Characteristics

Altitude 60,000 ft. (18 km) (max.)

> 60,000 ft. (18 km) for velocities < 1000 knots

Standard Features Motorola DGPS input 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 0183 output

Velocity filtering (user controlled)

Miscellaneous

Optional Features Lithium battery

Right angle SMB RF connector

On-board LNA for passive antenna support

Low profile shields

Revision 5.0 08/30/02

3.15

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