Merge pull request #1 from osqzss/master

update

Makefile

@@ -5,8 +5,8 @@ all: gps-sdr-sim
 
 SHELL=/bin/bash
 CC=gcc
-CFLAGS=-fopenmp -O3 -Wall
+CFLAGS=-O3 -Wall
-LDFLAGS=-lm -fopenmp
+LDFLAGS=-lm
 
 gps-sdr-sim: gpssim.o
 	${CC} $< ${LDFLAGS} -o $@
@@ -15,5 +15,6 @@ clean:
 	rm -f gpssim.o gps-sdr-sim *.bin
 
 time: gps-sdr-sim
+	time ./gps-sdr-sim -e brdc3540.14n -u circle.csv -b 1
 	time ./gps-sdr-sim -e brdc3540.14n -u circle.csv -b 8
 	time ./gps-sdr-sim -e brdc3540.14n -u circle.csv -b 16

README.md

@@ -10,15 +10,12 @@ to RF using software-defined radio (SDR) platforms, such as
 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.
+5. Build the solution.
-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
+$ gcc gpssim.c -lm -O3 -o gps-sdr-sim
 ```
 
 ### Generating the GPS signal file
@@ -40,11 +37,23 @@ 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.
+support 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).
 
+The simulation start time can be specified if the corresponding set of ephemerides
+is available. Otherwise the first time of ephemeris in the RINEX navigation file
+is selected.
+
+The maximum simulation duration time is defined by USER_MOTION_SIZE to 
+prevent the output file from getting too large.
+
+The output file size can be reduced by using "-b 1" option to store 
+four 1-bit I/Q samples into a single byte. 
+You can use [bladeplayer](https://github.com/osqzss/gps-sdr-sim/tree/master/player)
+for bladeRF to playback the compressed file.
+
 ```
 Usage: gps-sdr-sim [options]
 Options:
@@ -52,23 +61,26 @@ Options:
   -u <user_motion> User motion file (dynamic mode)
   -g <nmea_gga>    NMEA GGA stream (dynamic mode)
   -l <location>    Lat,Lon,Hgt (static mode) e.g. 30.286502,120.032669,100
+  -t <date,time>   Scenario start time YYYY/MM/DD,hh:mm:ss
+  -d <duration>    Duration [sec] (max: 300)
   -o <output>      I/Q sampling data file (default: gpssim.bin)
   -s <frequency>   Sampling frequency [Hz] (default: 2600000)
-  -b <iq_bits>     I/Q data format [8/16] (default: 8)
+  -b <iq_bits>     I/Q data format [1/8/16] (default: 16)
+  -v               Show details about simulated channels
 ```
 
 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 -u circle.csv
 ```
 
 ```
-> gps-sdr-sim -e brdc3540.14n -g triumphv3.txt -b 16
+> gps-sdr-sim -e brdc3540.14n -g triumphv3.txt
 ```
 
 ```
-> gps-sdr-sim -e brdc3540.14n -l 30.286502,120.032669,100 -b 16
+> gps-sdr-sim -e brdc3540.14n -l 30.286502,120.032669,100
 ```
 
 ### Transmitting the samples

extclk/Readme.md

@@ -0,0 +1,21 @@
+# HackRF External TCXO
+
+### Gerber Files
+
+| File       | Layer                   |
+|:-----------|:------------------------|
+| extclk.GTL | Top layer               |
+| extclk.GBL | Bottom layer            |
+| extclk.GTS | Top solder stop mask    |
+| extclk.GBS | Bottom solder stop mask |
+| extclk.GTO | Top silk mask           |
+| extclk.TXT | NC Drill                |
+| extclk.GML | Mechanical layer        |
+
+### BOM (bill of material)
+
+| Part | Value |
+|:-----|:------|
+|X1    |[FOX924B-10.000](http://www.digikey.com/product-detail/en/FOX924B-10.000/631-1067-1-ND/1024772), TCXO 10MHz HCMOS 2.5ppm|
+|C1    |CAP 1uF 0805|
+|C2    |OPEN|

extclk/extclk.GBL

@@ -0,0 +1,720 @@
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+X005407Y003555D02*
+X005463Y003555D01*
+M02*

extclk/extclk.GBS

@@ -0,0 +1,31 @@
+G75*
+G70*
+%OFA0B0*%
+%FSLAX24Y24*%
+%IPPOS*%
+%LPD*%
+%AMOC8*
+5,1,8,0,0,1.08239X$1,22.5*
+%
+%ADD10C,0.0000*%
+%ADD11C,0.0634*%
+D10*
+X000534Y001854D02*
+X000534Y008941D01*
+X005652Y008941D01*
+X005652Y001854D01*
+X000534Y001854D01*
+D11*
+X003971Y002504D03*
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+X004971Y002504D03*
+M02*

extclk/extclk.GML

@@ -0,0 +1,17 @@
+G75*
+G70*
+%OFA0B0*%
+%FSLAX24Y24*%
+%IPPOS*%
+%LPD*%
+%AMOC8*
+5,1,8,0,0,1.08239X$1,22.5*
+%
+%ADD10C,0.0000*%
+D10*
+X000534Y001854D02*
+X000534Y008941D01*
+X005652Y008941D01*
+X005652Y001854D01*
+X000534Y001854D01*
+M02*

extclk/extclk.GTO

@@ -0,0 +1,109 @@
+G75*
+G70*
+%OFA0B0*%
+%FSLAX24Y24*%
+%IPPOS*%
+%LPD*%
+%AMOC8*
+5,1,8,0,0,1.08239X$1,22.5*
+%
+%ADD10C,0.0000*%
+%ADD11C,0.0079*%
+%ADD12C,0.0080*%
+D10*
+X000534Y001854D02*
+X000534Y008941D01*
+X005652Y008941D01*
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+X000534Y001854D01*
+D11*
+X001400Y003075D02*
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+X005471Y002004D01*
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+X004471Y008004D01*
+D12*
+X001163Y007663D02*
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+X000902Y003154D01*
+X001111Y003154D01*
+X001163Y003207D01*
+X001163Y003311D01*
+X001111Y003364D01*
+M02*

extclk/extclk.GTS

@@ -0,0 +1,43 @@
+G75*
+G70*
+%OFA0B0*%
+%FSLAX24Y24*%
+%IPPOS*%
+%LPD*%
+%AMOC8*
+5,1,8,0,0,1.08239X$1,22.5*
+%
+%ADD10C,0.0000*%
+%ADD11C,0.0634*%
+%ADD12R,0.0434X0.0532*%
+%ADD13R,0.0631X0.0749*%
+D10*
+X000534Y001854D02*
+X000534Y008941D01*
+X005652Y008941D01*
+X005652Y001854D01*
+X000534Y001854D01*
+D11*
+X003971Y002504D03*
+X003971Y003504D03*
+X003971Y004504D03*
+X003971Y005504D03*
+X003971Y006504D03*
+X003971Y007504D03*
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+D12*
+X002503Y003429D03*
+X001715Y003429D03*
+X001715Y007366D03*
+X002503Y007366D03*
+D13*
+X002640Y006225D03*
+X001577Y006225D03*
+X001577Y004571D03*
+X002640Y004571D03*
+M02*

extclk/extclk.TXT

@@ -0,0 +1,27 @@
+%
+M48
+M72
+T01C0.0157
+T02C0.0394
+%
+T01
+X1322Y2445
+X3133Y3390
+X3172Y5358
+X3133Y7366
+X1322Y8351
+X5022Y8351
+T02
+X4971Y7504
+X4971Y6504
+X4971Y5504
+X4971Y4504
+X4971Y3504
+X4971Y2504
+X3971Y2504
+X3971Y3504
+X3971Y4504
+X3971Y5504
+X3971Y6504
+X3971Y7504
+M30

gpssim.h

@@ -0,0 +1,155 @@
+#ifndef GPSSIM_H
+#define GPSSIM_H
+
+#define TRUE	(1)
+#define FALSE	(0)
+
+/*! \brief Maximum length of a line in a text file (RINEX, motion) */
+#define MAX_CHAR (100)
+
+/*! \brief Maximum number of satellites in RINEX file */
+#define MAX_SAT (32)
+
+/*! \brief Maximum number of channels we simulate */
+#define MAX_CHAN (16)
+
+/*! \brief Maximum number of user motion points */
+#define USER_MOTION_SIZE (3000) // max duration at 10Hz
+
+/*! \brief Number of subframes */
+#define N_SBF (5) // 5 subframes per frame
+
+/*! \brief Number of words per subframe */
+#define N_DWRD_SBF (10) // 10 word per subframe
+
+/*! \brief Number of words */
+#define N_DWRD ((N_SBF+1)*N_DWRD_SBF) // Subframe word buffer size
+
+/*! \brief C/A code sequence length */
+#define CA_SEQ_LEN (1023)
+
+#define SECONDS_IN_WEEK 604800.0
+#define SECONDS_IN_HALF_WEEK 302400.0
+#define SECONDS_IN_DAY 86400.0
+#define SECONDS_IN_HOUR 3600.0
+#define SECONDS_IN_MINUTE 60.0
+
+#define POW2_M5  0.03125
+#define POW2_M19 1.907348632812500e-6
+#define POW2_M29 1.862645149230957e-9
+#define POW2_M31 4.656612873077393e-10
+#define POW2_M33 1.164153218269348e-10
+#define POW2_M43 1.136868377216160e-13
+#define POW2_M55 2.775557561562891e-17
+
+// Conventional values employed in GPS ephemeris model (ICD-GPS-200)
+#define GM_EARTH 3.986005e14
+#define OMEGA_EARTH 7.2921151467e-5
+#define PI 3.1415926535898
+
+#define WGS84_RADIUS	6378137.0
+#define WGS84_ECCENTRICITY 0.0818191908426
+
+#define R2D 57.2957795131
+
+#define SPEED_OF_LIGHT 2.99792458e8
+#define LAMBDA_L1 0.190293672798365
+
+/*! \brief GPS L1 Carrier frequency */
+#define CARR_FREQ (1575.42e6)
+/*! \brief C/A code frequency */
+#define CODE_FREQ (1.023e6)
+#define CARR_TO_CODE (1.0/1540.0)
+
+// Sampling data format
+#define SC01 (1)
+#define SC08 (8)
+#define SC16 (16)
+
+#define EPHEM_ARRAY_SIZE (13) // for daily GPS broadcast ephemers file (brdc)
+
+/*! \brief Structure representing GPS time */
+typedef struct
+{
+	int week;	/*!< GPS week number (since January 1980) */
+	double sec; 	/*!< second inside the GPS \a week */
+} gpstime_t;
+
+/*! \brief Structure repreenting UTC time */
+typedef struct
+{
+	int y; 		/*!< Calendar year */
+	int m;		/*!< Calendar month */
+	int d;		/*!< Calendar day */
+	int hh;		/*!< Calendar hour */
+	int mm;		/*!< Calendar minutes */
+	double sec;	/*!< Calendar seconds */
+} datetime_t;
+
+/*! \brief Structure representing ephemeris of a single satellite */
+typedef struct
+{
+	int vflg;	/*!< Valid Flag */
+	datetime_t t;
+	gpstime_t toc;	/*!< Time of Clock */
+	gpstime_t toe;	/*!< Time of Ephemeris */
+	int iodc;	/*!< Issue of Data, Clock */
+	int iode;	/*!< Isuse of Data, Ephemeris */
+	double deltan;	/*!< Delta-N (radians/sec) */
+	double cuc;	/*!< Cuc (radians) */
+	double cus;	/*!< Cus (radians) */
+	double cic;	/*!< Correction to inclination cos (radians) */
+	double cis;	/*!< Correction to inclination sin (radians) */
+	double crc;	/*!< Correction to radius cos (meters) */
+	double crs;	/*!< Correction to radius sin (meters) */
+	double ecc;	/*!< e Eccentricity */
+	double sqrta;	/*!< sqrt(A) (sqrt(m)) */
+	double m0;	/*!< Mean anamoly (radians) */
+	double omg0;	/*!< Longitude of the ascending node (radians) */
+	double inc0;	/*!< Inclination (radians) */
+	double aop;
+	double omgdot;	/*!< Omega dot (radians/s) */
+	double idot;	/*!< IDOT (radians/s) */
+	double af0;	/*!< Clock offset (seconds) */
+	double af1;	/*!< rate (sec/sec) */
+	double af2;	/*!< acceleration (sec/sec^2) */
+	double tgd;	/*!< Group delay L2 bias */
+	// Working variables follow
+	double n; 	/*!< Mean motion (Average angular velocity) */
+	double sq1e2;	/*!< sqrt(1-e^2) */
+	double A;	/*!< Semi-major axis */
+	double omgkdot; /*!< OmegaDot-OmegaEdot */
+} ephem_t;
+
+typedef struct
+{
+	gpstime_t g;
+	double range; // pseudorange
+	double rate;
+	double d; // geometric distance
+	double azel[2];
+} range_t;
+
+/*! \brief Structure representing a Channel */
+typedef struct
+{
+	int prn;	/*< PRN Number */
+	int ca[CA_SEQ_LEN]; /*< C/A Sequence */
+	double f_carr;	/*< Carrier frequency */
+	double f_code;	/*< Code frequency */
+	unsigned int carr_phase; /*< Carrier phase */
+	int carr_phasestep;	/*< Carrier phasestep */
+	double code_phase; /*< Code phase */
+	gpstime_t g0;	/*!< GPS time at start */
+	unsigned long sbf[5][N_DWRD_SBF]; /*!< current subframe */
+	unsigned long dwrd[N_DWRD]; /*!< Data words of sub-frame */
+	int iword;	/*!< initial word */
+	int ibit;	/*!< initial bit */
+	int icode;	/*!< initial code */
+	int dataBit;	/*!< current data bit */
+	int codeCA;	/*!< current C/A code */
+	double azel[2];
+	range_t rho0;
+} channel_t;
+
+#endif

player/bladeplayer.c

@@ -2,7 +2,13 @@
 
 #include <stdlib.h>
 #include <stdio.h>
+#include <string.h>
 #include <libbladeRF.h>
+#ifdef _WIN32
+#include "getopt.h"
+#else
+#include <unistd.h>
+#endif
 
 #define TX_FREQUENCY    1575420000
 #define TX_SAMPLERATE   2600000
@@ -15,6 +21,18 @@
 #define NUM_TRANSFERS       16
 #define TIMEOUT_MS          1000
 
+#define AMPLITUDE (1000) // Default amplitude for 12-bit I/Q
+
+void usage(void)
+{
+	fprintf(stderr, "Usage: bladeplayer [options]\n"
+		"  -f <tx_file>  I/Q sampling data file (required)\n"
+		"  -b <iq_bits>  I/Q data format [1/16] (default: 16)\n"
+		"  -g <tx_vga1>  TX VGA1 gain (default: %d)\n",
+		TX_VGA1);
+
+	return;
+}
 int main(int argc, char *argv[])
 {
 	int status;
@@ -26,16 +44,71 @@ int main(int argc, char *argv[])
 	enum state {INIT, READ_FILE, PAD_TRAILING, DONE};
 	enum state state = INIT;
 
-	if (argc!=2) {
+	int compressed = 0;
-		fprintf(stderr, "Usage: bladeplayer <tx_file>\n");
+	uint8_t *read_buffer;
+	size_t samples_read;
+	int16_t lut[256][8];
+	int16_t amp = AMPLITUDE;
+	int i,k;
+
+	int gain = TX_VGA1;
+	int result;
+	int data_format;
+	char txfile[128];
+
+	// Empty TX file name
+	txfile[0] = 0;
+
+	if (argc<3) {
+		usage();
 		exit(1);
 	}
 
+	while ((result=getopt(argc,argv,"g:b:f:"))!=-1)
+	{
+		switch (result)
+		{
+		case 'g':
+			gain = atoi(optarg);
+			if (gain>-4 || gain<-35)
+			{
+				printf("ERROR: Invalid TX VGA1 gain.\n");
+				exit(1);
+			}
+			break;
+		case 'b':
+			data_format = atoi(optarg);
+			if (data_format!=1 && data_format!=16)
+			{
+				printf("ERROR: Invalid I/Q data format.\n");
+				exit(1);
+			}
+			else if (data_format==1)
+				compressed = 1;
+			break;
+		case 'f':
+			strcpy(txfile, optarg);
+			break;
+		case ':':
+		case '?':
+			usage();
+			exit(1);
+		default:
+			break;
+		}
+	}
+
 	// Open TX file.
-	fp = fopen(argv[1], "rb");
+	if (txfile[0]==0)
+	{
+		printf("ERROR: I/Q sampling data file is not specified.\n");
+		exit(1);
+	}
+
+	fp = fopen(txfile, "rb");
 
 	if (fp==NULL) {
-		fprintf(stderr, "Failed to open TX file: %s\n", argv[1]);
+		fprintf(stderr, "ERROR: Failed to open TX file: %s\n", argv[1]);
 		exit(1);
 	}
 
@@ -75,13 +148,13 @@ int main(int argc, char *argv[])
 		printf("TX bandwidth: %u Hz\n", TX_BANDWIDTH);
 	}
 
-	status = bladerf_set_txvga1(dev, TX_VGA1);
+	status = bladerf_set_txvga1(dev, gain);
 	if (status != 0) {
 		fprintf(stderr, "Failed to set TX VGA1 gain: %s\n", bladerf_strerror(status));
 		goto out;
 	}
 	else {
-		printf("TX VGA1 gain: %d dB\n", TX_VGA1);
+		printf("TX VGA1 gain: %d dB\n", gain);
 	}
 
 	status = bladerf_set_txvga2(dev, TX_VGA2);
@@ -97,13 +170,27 @@ int main(int argc, char *argv[])
 	printf("Running...\n");
 
 	// Allocate a buffer to hold each block of samples to transmit.
-	tx_buffer = (int16_t*)malloc(SAMPLES_PER_BUFFER* 2 * sizeof(int16_t));
+	tx_buffer = (int16_t*)malloc(SAMPLES_PER_BUFFER * 2 * sizeof(int16_t));
 	
 	if (tx_buffer == NULL) {
 		fprintf(stderr, "Failed to allocate TX buffer.\n");
 		goto out;
 	}
 
+	// if compressed
+	read_buffer = (uint8_t*)malloc(SAMPLES_PER_BUFFER / 4);
+
+	if (read_buffer == NULL) {
+		fprintf(stderr, "Failed to allocate read buffer.\n");
+		goto out;
+	}
+
+	for (i=0; i<256; i++)
+	{
+		for (k=0; k<8; k++)
+			lut[i][k] = ((i>>(7-k))&0x1)?amp:-amp;
+	}
+
 	// Configure the TX module for use with the synchronous interface.
 	status = bladerf_sync_config(dev,
 			BLADERF_MODULE_TX,
@@ -131,6 +218,9 @@ int main(int argc, char *argv[])
 		int16_t *tx_buffer_current = tx_buffer;
 		unsigned int buffer_samples_remaining = SAMPLES_PER_BUFFER;
 
+		// if compressed
+		unsigned int read_samples_remaining = SAMPLES_PER_BUFFER / 4;
+
 		// Keep adding to the buffer until it is full or a failure occurs
 		while (buffer_samples_remaining > 0 && status == 0 && state != DONE) {
 			size_t samples_populated = 0;
@@ -139,11 +229,35 @@ int main(int argc, char *argv[])
 				case INIT:
 				case READ_FILE:
 					// Read from the input file
-					samples_populated = fread(tx_buffer_current,
+					if (compressed)
-							2 * sizeof(int16_t),
+					{
-							buffer_samples_remaining,
+						int16_t *write_buffer_current = tx_buffer;
-							fp);
+
-			
+						samples_read = fread(read_buffer,
+								sizeof(uint8_t),
+								read_samples_remaining,
+								fp);
+
+						samples_populated = samples_read * 4;
+						buffer_samples_remaining = read_samples_remaining * 4;
+
+						// Expand compressed data into TX buffer
+						for (i=0; i<samples_read; i++)
+						{
+							memcpy(write_buffer_current, lut[read_buffer[i]], 8);
+						
+							// Advance the write buffer pointer
+							write_buffer_current += 8;
+						}
+					}
+					else
+					{
+						samples_populated = fread(tx_buffer_current,
+								2 * sizeof(int16_t),
+								buffer_samples_remaining,
+								fp);
+					}
+
 					// If the end of the file was reached, pad the rest of the buffer and finish.
 					if (feof(fp)) {
 						state = PAD_TRAILING;
@@ -187,6 +301,9 @@ int main(int argc, char *argv[])
 	// Free up our resources
 	free(tx_buffer);
 
+	// if compressed
+	free(read_buffer);
+
 	// Close TX file
 	fclose(fp);