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System for generating satellite navigation occultation signal

A technology for signal generation and satellite navigation, applied in the field of satellite navigation, to achieve the effect of solving high cost, avoiding the cumulative effect of truncation errors, and ensuring consistency

Active Publication Date: 2012-11-14
SPACE STAR TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, it is really possible to apply occultation forward simulation technology to physical radio frequency simulation. The research at home and abroad is still in its infancy, and no public literature has been published.

Method used

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  • System for generating satellite navigation occultation signal
  • System for generating satellite navigation occultation signal
  • System for generating satellite navigation occultation signal

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Embodiment Construction

[0030] The specific implementation manners of the present invention will be further introduced below in conjunction with the accompanying drawings.

[0031] The signal processing flow of the occultation detection system is as follows: figure 1 As shown, firstly, the radio frequency signal of the direct star is processed, the positioning is performed and the almanac is solved, and the height of the tangent point of the navigation star is calculated according to the positioning information and the orbit information of the navigation star in the almanac, and the height of the tangent point is used as the criterion (the mountain-based occultation event’s The criterion is the elevation angle) to predict the occultation event, when the occultation event is predicted to occur, the high-speed sampling processing equipment in the occultation receiver will be triggered to collect carrier phase information at a rate of 100 Hz until the occultation event disappears, and finally the The co...

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Abstract

The invention discloses a system for generating a satellite navigation occultation signal. The system comprises a parameter calculating and real-time updating module, a middle-frequency navigation signal generating module, a DAC (Digital to Analog Convertor) module and an upper frequency conversion module, wherein the parameter calculating and real-time updating module is used for receiving inputdirect star observing data and occultation observing data, generating an accumulative parameters and power control codes corresponding to the direct star observing data and the occultation signal observing data respectively, compensating for the accumulative parameters of the direct star observing data and the occultation observing data, and outputting the power control codes and the compensated accumulative parameters to the middle-frequency navigation signal generating module; and the middle-frequency navigation signal generating module is used for generating a direct star digital middle-frequency simulation signal and an occultation digital middle-frequency simulation signal according to the input power control codes and the compensated accumulative parameters, and outputting to the DAC module. Due to the adoption of the system, the problems of high field experiment cost, easiness of interference and uncontrollable and unrepeatable simulation scene are solved effectively.

Description

technical field [0001] The invention provides a satellite navigation occultation signal generation system, which belongs to the technical field of satellite navigation. Background technique [0002] Occultation detection technology is an extended application of GNSS (Global Navigation Satellite System) in the field of atmospheric observation. It uses the phase delay and amplitude information generated by the refractive index changes that occur when GNSS signals propagate through the propagation medium (ionosphere and neutral atmosphere). , to invert ionospheric electron density with time, season, geographical location, solar activity level (space environment) changes and neutral atmospheric inversion layer, atmospheric gravity wave, and frontal changes. At present, occultation detection technology has developed into a meteorological powerful tool for research. [0003] At present, the research on occultation detection technology at home and abroad is mainly reflected in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/23
Inventor 孟斌王晔王宏伟王玲陈潇孙昊婧
Owner SPACE STAR TECH CO LTD
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