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First Signals of BeiDou Phase 3 Acquired at Ispra, Italy



 
 
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Old August 11th 15, 07:20 PM posted to sci.geo.satellite-nav
Sam Wormley[_2_]
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Default First Signals of BeiDou Phase 3 Acquired at Ispra, Italy

First Signals of BeiDou Phase 3 Acquired at Ispra, Italy
http://gpsworld.com/first-signals-of...t-ispra-italy/


On July 25, China launched two modernized BeiDou satellites. Although
the nomenclature is still controversial, the Joint Space Operations
Centre / North American Aerospace Defense Command identifiers for the
satellites are BEIDOU-3 M1 and BEIDOU-3 M2. The satellites have been
placed in medium Earth orbit (MEO). M2 has already reached its
designated orbital slot, while M1 is still drifting to its slot.

On Aug. 9, some signals from these satellites were received with a
software-defined radio sampler operated at the European Commissionís
Joint Research Centre in Ispra, Italy. The sampler is driven by
orbit-prediction software that triggers a synchronized acquisition on
both 1575.42 MHz and 1278.75 MHz using 1-bit complex samples at 60
megasamples per second (about 60 MHz total bandwidth). The two-line
element sets for the orbits were obtained from the CelesTrak website
and predicted positions were computed using code developed following
the Simplified General Perturbations Satellite Orbit Model 4 (SGP4)
as documented in the U.S. Department of Defense Spacetrack Report No.
3.

To confirm the identity of the satellite being tracked using codeless
tracking, we matched the measured Doppler frequency shift with the
predicted one. The local oscillator clock drift was modeled using GPS
L1 C/A-code signals and taken into account when matching the Doppler
shift.



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