Add a sample configuration enabling GPS L1 C/A, Galileo E1, GLONASS
L1 C/A, and BeiDou B1I simultaneously through the new native
Bladerf_Signal_Source, following the same single-capture, multi-band
split already used by the existing USRP X300 and HackRF multichannel
templates.
One 56 Msps / 56 MHz wideband capture centered at 1584 MHz (the
maximum bandwidth supported by a bladeRF 2.0 Micro) is split via
SignalSource.RF_channels=3 into three Freq_Xlating_Fir_Filter
sub-bands tapping the same physical stream: BeiDou B1I (1561.098
MHz), GPS L1 C/A + Galileo E1 (co-located at 1575.42 MHz), and
GLONASS L1 C/A (FDMA, centered near 1602 MHz). The frequency plan and
per-system acquisition/tracking parameters are carried over from the
existing USRP X300 four-constellation template.
Verified against a physical bladeRF 2.0 Micro: the receiver
simultaneously acquired and tracked real satellites on all four
systems from a live antenna.
Signed-off-by: Oleksandr Suvorov <cryosay@gmail.com>
Add a Bladerf_Signal_Source that streams RX samples directly from
bladeRF front-ends (bladeRF x40, x115, and bladeRF 2.0 Micro xA4/xA9)
through libbladeRF, instead of going through the generic gr-osmosdr
wrapper. gr-osmosdr's bladerf backend does not expose usable per-stage
gain control on bladeRF2 hardware and has no support for the RX bias
tee used to power an active antenna on the 2.0 Micro.
The new gr::sync_block (bladerf_source) talks to libbladeRF's
synchronous streaming API directly; the adapter (BladerfSignalSource)
follows the existing SignalSourceBase pattern used by the other signal
sources, with valve and dump support wired the same way. Building it
is gated behind -DENABLE_BLADERF=ON, degrades gracefully when
libbladeRF is absent, and requires libbladeRF v2.6.0 or newer,
enforced at configure time.
Verified against a physical bladeRF 2.0 Micro: the receiver opens the
device, streams live samples, and acquires and tracks real GPS
satellites end to end using the new sample configuration file.
Only single-channel (SISO) reception is supported for now; the second
RX channel is not yet exposed.
Signed-off-by: Oleksandr Suvorov <cryosay@gmail.com>
Oleksandr Suvorov