文件列表:

LICENSE (1082, 2015-08-30)
Makefile (360, 2015-08-30)
bladerf.script (150, 2015-08-30)
brdc3540.14n (270728, 2015-08-30)
circle.csv (135000, 2015-08-30)
getopt.c (4241, 2015-08-30)
getopt.h (148, 2015-08-30)
gps-sdr-sim-uhd.py (2861, 2015-08-30)
gpssim.c (45787, 2015-08-30)
player (0, 2015-08-30)
player\bladeplayer.c (4944, 2015-08-30)
rocket.csv (175545, 2015-08-30)
rtk (0, 2015-08-30)
rtk\base.csv (135000, 2015-08-30)
rtk\base.nav (8231, 2015-08-30)
rtk\base.obs (268485, 2015-08-30)
rtk\base.ubx (197732, 2015-08-30)
rtk\rover.csv (135000, 2015-08-30)
rtk\rover.nav (8231, 2015-08-30)
rtk\rover.obs (246091, 2015-08-30)
rtk\rover.ubx (180948, 2015-08-30)
rtk\rtklib (0, 2015-08-30)
rtk\rtklib\gndtrk.png (21124, 2015-08-30)
rtk\rtklib\option1.png (20522, 2015-08-30)
rtk\rtklib\option2.png (19157, 2015-08-30)
rtk\rtklib\option3.png (20494, 2015-08-30)
rtk\rtklib\option4.png (19111, 2015-08-30)
rtk\rtklib\position.png (26216, 2015-08-30)
rtk\rtklib\residual.png (30039, 2015-08-30)
rtk\rtklib\rtkpost.png (23242, 2015-08-30)
satellite.csv (54000, 2015-08-30)
satgen (0, 2015-08-30)
satgen\Makefile (185, 2015-08-30)
satgen\google_earth_kml.png (1209288, 2015-08-30)
satgen\google_earth_path.png (1051602, 2015-08-30)
satgen\nmea2um.c (2599, 2015-08-30)
... ...

# GPS-SDR-SIM GPS-SDR-SIM generates GPS baseband signal data streams, which can be converted to RF using software-defined radio (SDR) platforms, such as [bladeRF](http://nuand.com/), [HackRF](https://github.com/mossmann/hackrf/wiki), and [USRP](http://www.ettus.com/). ### Windows build instructions 1. Start Visual Studio. 2. Create an empty project for a console application. 3. On the Solution Explorer at right, add "gpssim.c" and "getopt.c" to the Souce Files folder. 4. Select "Release" in Solution Configurations drop-down list. 5. Open the Property Pages dialog box and expand the Configuration Properties. 6. Expand the C/C++ node and select the Language property page. 7. Enable the OpenMP Support (/openmp). 8. Build the solution. ### Building with GCC ``` $ gcc gpssim.c -lm -fopenmp -o gps-sdr-sim ``` ### Generating the GPS signal file A user-defined trajectory can be specified in either a CSV file, which contains the Earth-centered Earth-fixed (ECEF) user positions, or an NMEA GGA stream. The sampling rate of the user motion has to be 10Hz. The user is also able to assign a static location directly through the command line. The user specifies the GPS satellite constellation through a GPS broadcast ephemeris file. The daily GPS broadcast ephemers file (brdc) is a merge of the indiviual site navigation files into one. The archive for the daily file is: [ftp://cddis.gsfc.nasa.gov/gnss/data/daily/](ftp://cddis.gsfc.nasa.gov/gnss/data/daily/) These files are then used to generate the simulated pseudorange and Doppler for the GPS satellites in view. This simulated range data is then used to generate the digitized I/Q samples for the GPS signal. The bladeRF command line interface requires I/Q pairs stored as signed 16-bit integers, while the hackrf_transfer and gps-sdr-sim-uhd.py supports signed bytes. HackRF and bladeRF require 2.6 MHz sample rate, while the USRP2 requires 2.5 MHz (an even integral decimator of 100 MHz). ``` Usage: gps-sdr-sim [options] Options: -e RINEX navigation file for GPS ephemerides (required) -u User motion file (dynamic mode) -g NMEA GGA stream (dynamic mode) -l Lat,Lon,Hgt (static mode) e.g. 30.286502,120.032669,100 -o

I/Q sampling data file (default: gpssim.bin) -s Sampling frequency [Hz] (default: 2600000) -b I/Q data format [8/16] (default: 8) ``` The user motion can be specified in either dynamic or static mode: ``` > gps-sdr-sim -e brdc3540.14n -u circle.csv -b 16 ``` ``` > gps-sdr-sim -e brdc3540.14n -g triumphv3.txt -b 16 ``` ``` > gps-sdr-sim -e brdc3540.14n -l 30.286502,120.032669,100 -b 16 ``` ### Transmitting the samples The TX port of a particular SDR platform is connected to the GPS receiver under test through a DC block and a fixed 50-60dB attenuator. The simulated GPS signal file, named "gpssim.bin", can be loaded into the bladeRF for playback as shown below: ``` set frequency 1575.42M set samplerate 2.6M set bandwidth 2.5M set txvga1 -25 cal lms cal dc tx tx config file=gpssim.bin format=bin tx start ``` You can also execute these commands via the `bladeRF-cli` script option as below: ``` > bladeRF-cli -s bladerf.script ``` For the HackRF: ``` > hackrf_transfer -t gpssim.bin -f 1575420000 -s 2600000 -a 1 -x 0 ``` For UHD supported devices (tested with USRP2 only): ``` > gps-sdr-sim-uhd.py -t gpssim.bin -s 2500000 -x 0 ``` ### License Copyright © 2015 Takuji Ebinuma Distributed under the [MIT License](http://www.opensource.org/licenses/mit-license.php).

近期下载者：

相关文件：

评论：[我要评论] [举报此文件]

收藏者：