[time-nuts] VP Oncore Frequency

Brian Kirby kirbybq at bellsouth.net
Sat Feb 17 19:23:13 EST 2007


Its the GPS frequency transmitted by the satellite.  It will be the 
input to your antenna connector.

stork3264 at comcast.net wrote:
> 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 (1&#963;) with SA on
> • In Position-Hold mode, <50 ns observed (1&#963;) 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 &#956;A typ, 60 &#956;A max
> • 3V onboard battery; 15 &#956;A typ., 60 &#956;A 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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> 
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