[time-nuts] VP Oncore Frequency
stork3264 at comcast.net
stork3264 at comcast.net
Sat Feb 17 23:08:01 UTC 2007
2-17-07
VP Oncore Engineering notes under product specification Characteristics of
receiver architecture has a listing of
L1 - 1572.42 Mhz.
Is anyone knowledgable as to the take off point of this frequency on the PCB?
Thanks,
Stork
1. Product Specifications
VP ONCORE GPS Receiver Technical Characteristics
Receiver Architecture 6 (or 8) channel
L1 1575.42 MHz
C/A code (1.023 MHz chip rate)
Code plus carrier tracking (carrier aided tracking)
Tracking Capability 6 (or 8) simultaneous satellite vehicles
Dynamics Velocity: 1000 knots (515 m/s)
>1000 knots at altitudes < 60,000 ft
Acceleration: 4g
Jerk: 5 m/s3
Vibration: 7.7G per MIL-STD 810E
Acquisition Time (Time to
First Fix (TTFF)
20 sec. typical TTFF (with current almanac, position, time,
and ephemeris)
45 sec. typical TTFF (with current almanac, position, and
time)
2.5 sec. typical reacquire
Positioning Accuracy Less than 25 meters, SEP (without SA)
Less than 100 meters, SEP (with SA)
DGPS accuracy: 1-5 meters typical
Timing Accuracy (1 Pulse
Per Second, 1PPS)
130 ns observed (1σ) with SA on
In Position-Hold mode, <50 ns observed (1σ) with SA on
Antenna Active micro-strip patch antenna module
Powered by receiver module (25 mA @ 5V)
Passive antenna configuration (see optional features)
Datums 49 std datums, 2 user defined, default WGS-84
Output Messages Latitude, longitude, height, velocity, heading, time,
satellite tracking status (Motorola Binary protocol)
NMEA-0183 v2.00 (selected formats) available
Software selectable output rate (continuous or poll)
Broad list of command/control messages
TTL interface
Power Requirements 5 +/- 0.25 Vdc; 50 mV p-p ripple max
Keep Alive BATT Power External 2.5 V to 5.25 V; 15 μA typ, 60 μA max
3V onboard battery; 15 μA typ., 60 μA max.
Power Consumption 1.1 W @ 5 Vdc
Dimensions Receiver: 2.00 x 3.25 x 0.64 in. (51 x 83 x 16 mm)
Active antenna: 4.01d x 0.89 in. high (102 x 22.6 mm)
Weight Receiver: 1.8 oz (51 g)
Active antenna module: 4.8 oz (136 g)
Connectors Data/Power: 10 pin (2x5) unshrouded header on 0,1"
centers
RF: Right Angle OSX (subminiature snap-on)
Antenna to Receiver
Interconnection
Single coaxial cable (6 dB max loss at L1; 1574.42 MHz)
Operating Temperature Receiver module -30°C to + 85°C
Humidity 95% non-condensing, +30°C to + 60°C
Altitude 60,000 ft (18 km)
> 60,000 ft (18 km) for velocities < 1000 knots
Optional Features 1PPS Timing Output
Raw measurement data
Onboard rechargeable lithium battery
Onboard LNA option for use with passive antenna
DGPS Differential GPS standard software feature
RTCM-104 format (remote input)
Motorola Custom Format
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