/****************************************************************************
 *
 *   Copyright (C) 2014 PX4 Development Team. All rights reserved.
 *   Author: @author Thomas Gubler <thomasgubler@student.ethz.ch>
 *           @author Julian Oes <joes@student.ethz.ch>
 *           @author Lorenz Meier <lm@inf.ethz.ch>
 *
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 * 3. Neither the name PX4 nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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/**
 * @file satellite_info.h
 * Definition of the GNSS satellite info uORB topic.
 */

#ifndef TOPIC_SAT_INFO_H_
#define TOPIC_SAT_INFO_H_

#include <stdint.h>
#include "../uORB.h"

/**
 * @addtogroup topics
 * @{
 */

/**
 * GNSS Satellite Info.
 */

#define SAT_INFO_MAX_SATELLITES  20

struct satellite_info_s {
	uint64_t timestamp;				/**< Timestamp of satellite info */
	uint8_t count;					/**< Number of satellites in satellite info */
	uint8_t svid[SAT_INFO_MAX_SATELLITES]; 		/**< Space vehicle ID [1..255], see scheme below  */
	uint8_t used[SAT_INFO_MAX_SATELLITES];		/**< 0: Satellite not used, 1: used for navigation */
	uint8_t elevation[SAT_INFO_MAX_SATELLITES];	/**< Elevation (0: right on top of receiver, 90: on the horizon) of satellite */
	uint8_t azimuth[SAT_INFO_MAX_SATELLITES];	/**< Direction of satellite, 0: 0 deg, 255: 360 deg. */
	uint8_t snr[SAT_INFO_MAX_SATELLITES];		/**< dBHz, Signal to noise ratio of satellite C/N0, range 0..99, zero when not tracking this satellite. */
};

/**
 * NAV_SVINFO space vehicle ID (svid) scheme according to u-blox protocol specs
 * u-bloxM8-V15_ReceiverDescriptionProtocolSpec_Public_(UBX-13003221).pdf
 *
 * GPS		1-32
 * SBAS		120-158
 * Galileo	211-246
 * BeiDou	159-163, 33-64
 * QZSS		193-197
 * GLONASS	65-96, 255
 *
 */

/**
 * @}
 */

/* register this as object request broker structure */
ORB_DECLARE(satellite_info);

#endif