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Fix typos
This commit is contained in:
Carles Fernandez
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0400034d14
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622a76668d
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@ -696,7 +696,7 @@ Getting started
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2. You will need a GPS active antenna, a [USRP](http://www.ettus.com/product) and a suitable USRP daughter board to receive GPS L1 C/A signals. GNSS-SDR require to have at least 2 MHz of bandwidth in 1.57542 GHz. (remember to enable the DC bias with the daughter board jumper).
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We use a [DBSRX2](https://www.ettus.com/product/details/DBSRX2) to do the task, but you can try the newer Ettus' daughter boards as well.
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3. The easiest way to capture a signal file is to use the GNU Radio Companion GUI. Only two blocks are needed: a USRP signal source connected to complex float file sink. You need to tune the USRP central frequency and decimation factor using USRP signal source properties box. We suggest using a decimation factor of 20 if you use the USRP2. This will give you 100/20 = 5 MSPS which will be enough to receive GPS L1 C/A signals. The front-end gain should also be configured. In our test with the DBSRX2 we obtained good results with ```G=50```.
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4. Capture at least 80 seconds of signal in open sky conditions. During the process, be aware of USRP driver buffer underuns messages. If your hard disk is not fast enough to write data at this speed you can capture to a virtual RAM drive. 80 seconds of signal at 5 MSPS occupies less than 3 Gbytes using ```gr_complex<float>```.
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4. Capture at least 80 seconds of signal in open sky conditions. During the process, be aware of USRP driver buffer underruns messages. If your hard disk is not fast enough to write data at this speed you can capture to a virtual RAM drive. 80 seconds of signal at 5 MSPS occupies less than 3 Gbytes using ```gr_complex<float>```.
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5. If you have no access to a RF front-end, you can download a sample raw data file (that contains GPS and Galileo signals) from [here](http://sourceforge.net/projects/gnss-sdr/files/data/).
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3. You are ready to configure the receiver to use your captured file among other parameters:
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1. The default configuration file resides at [/usr/local/share/gnss-sdr/conf/default.conf](./conf/gnss-sdr.conf).
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@ -1030,7 +1030,7 @@ More documentation at the [Data Type Adapter Blocks page](http://gnss-sdr.org/do
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#### Input filter
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This block filters the input data. It can be combined with frequency translation for IF signals. The computation of the filter taps is based on parameters of GNU Radio's function [pm_remez](http://gnuradio.org/doc/doxygen/pm__remez_8h.html), that calculates the optimal (in the Chebyshev/minimax sense) FIR filter impulse response given a set of band edges, the desired reponse on those bands, and the weight given to the error in those bands.
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This block filters the input data. It can be combined with frequency translation for IF signals. The computation of the filter taps is based on parameters of GNU Radio's function [pm_remez](http://gnuradio.org/doc/doxygen/pm__remez_8h.html), that calculates the optimal (in the Chebyshev/minimax sense) FIR filter impulse response given a set of band edges, the desired response on those bands, and the weight given to the error in those bands.
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The block can be configured like this:
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@ -1085,7 +1085,7 @@ More documentation at the [Input Filter Blocks page](http://gnss-sdr.org/docs/sp
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#### Resampler
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This block resamples the input data stream. The ```Direct_Resampler``` block implements a nearest neigbourhood interpolation:
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This block resamples the input data stream. The ```Direct_Resampler``` block implements a nearest neighbourhood interpolation:
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~~~~~~
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;######### RESAMPLER CONFIG ############
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@ -843,7 +843,7 @@ void satantoff(gtime_t time, const double *rs, int sat, const nav_t *nav,
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* args : gtime_t time I time (gpst)
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* int sat I satellite number
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* nav_t *nav I navigation data
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* int opt I sat postion option
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* int opt I sat position option
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* (0: center of mass, 1: antenna phase center)
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* double *rs O sat position and velocity (ecef)
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* {x,y,z,vx,vy,vz} (m|m/s)
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@ -1056,7 +1056,7 @@ int decode_type1021(rtcm_t *rtcm __attribute__((unused)))
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}
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/* decode type 1022: moledenski-badekas transfromation -----------------------*/
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/* decode type 1022: moledenski-badekas transformation -----------------------*/
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int decode_type1022(rtcm_t *rtcm __attribute__((unused)))
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{
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trace(2, "rtcm3 1022: not supported message\n");
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@ -2699,7 +2699,7 @@ void save_msm_obs(rtcm_t *rtcm, int sys, msm_h_t *h, const double *r,
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/* signal to rinex obs type */
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code[i] = obs2code(sig[i], freq + i);
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/* freqency index for beidou */
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/* frequency index for beidou */
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if (sys == SYS_BDS)
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{
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if (freq[i] == 5)
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@ -4166,7 +4166,7 @@ void sunmoonpos(gtime_t tutc, const double *erpv, double *rsun,
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/* eci to ecef transformation matrix */
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eci2ecef(tutc, erpv, U, &gmst_);
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/* sun and moon postion in ecef */
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/* sun and moon position in ecef */
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if (rsun) matmul("NN", 3, 1, 3, 1.0, U, rs, 0.0, rsun);
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if (rmoon) matmul("NN", 3, 1, 3, 1.0, U, rm, 0.0, rmoon);
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if (gmst) *gmst = gmst_;
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@ -2223,7 +2223,7 @@ void rtkfree(rtk_t *rtk)
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* .vs [r] O data valid single (r=0:rover,1:base)
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* .resp [f] O freq(f+1) pseudorange residual (m)
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* .resc [f] O freq(f+1) carrier-phase residual (m)
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* .vsat [f] O freq(f+1) data vaild (0:invalid,1:valid)
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* .vsat [f] O freq(f+1) data valid (0:invalid,1:valid)
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* .fix [f] O freq(f+1) ambiguity flag
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* (0:nodata,1:float,2:fix,3:hold)
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* .slip [f] O freq(f+1) slip flag
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@ -2262,7 +2262,7 @@ int rtkpos(rtk_t *rtk, const obsd_t *obs, int n, const nav_t *nav)
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traceobs(4, obs, n);
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/*trace(5,"nav=\n"); tracenav(5,nav);*/
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/* set base staion position */
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/* set base station position */
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if (opt->refpos <= POSOPT_RINEX && opt->mode != PMODE_SINGLE &&
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opt->mode != PMODE_MOVEB)
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{
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@ -210,7 +210,7 @@ void updatesvr(rtksvr_t *svr, int ret, obs_t *obs, nav_t *nav, int sat,
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svr->nmsg[index][2]++;
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}
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else if (ret == 5)
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{ /* antenna postion parameters */
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{ /* antenna position parameters */
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if (svr->rtk.opt.refpos == 4 && index == 1)
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{
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for (i = 0; i < 3; i++)
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@ -616,10 +616,10 @@ int cmpmsgs(const void *p1, const void *p2)
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* (gtime_t te I end time )
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* sbs_t *sbs IO sbas messages
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* return : number of sbas messages
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* notes : sbas message are appended and sorted. before calling the funciton,
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* notes : sbas message are appended and sorted. before calling the function,
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* sbs->n, sbs->nmax and sbs->msgs must be set properly. (initially
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* sbs->n=sbs->nmax=0, sbs->msgs=NULL)
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* only the following file extentions after wild card expanded are valid
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* only the following file extensions after wild card expanded are valid
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* to read. others are skipped
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* .sbs, .SBS, .ems, .EMS
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*-----------------------------------------------------------------------------*/
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