Beidou B1 frequency point intermediate frequency signal simulation method

An intermediate frequency signal and simulation method technology, which is applied to satellite radio beacon positioning systems, measurement devices, instruments, etc., can solve problems such as being unsuitable for algorithm simulation verification, unable to meet the practical application requirements of global navigation, and difficult to obtain satellite signals.

Inactive Publication Date: 2013-09-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0004] The current signal of Beidou satellite navigation system is in the construction stage, which cannot meet the actual application requirements of global navigation, and the high dynamic track required in baseband signal processing and satellite signals in complex env

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  • Beidou B1 frequency point intermediate frequency signal simulation method
  • Beidou B1 frequency point intermediate frequency signal simulation method
  • Beidou B1 frequency point intermediate frequency signal simulation method

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Embodiment Construction

[0071] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0072] The present invention provides a Beidou B1 frequency point intermediate frequency signal simulation method, the simulation process is as follows figure 1 shown. First, set the simulation time, simulated satellite number, satellite position and velocity calculation start time (GPS weeks and seconds), sampling frequency, carrier-to-noise ratio, and receiver initial position, velocity, attitude and track, and pre-store the ephemeris and Almanac, the satellite position and velocity are calculated through the satellite ephemeris, the receiver position and velocity are calculated through the track solution, and the track transmission delay and Doppler frequency shift are calculated from the position and velocity of the satellite and the receiver. Using 0.2ms as the cycle solution, the track transmission delay can be extended to the transmission d...

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Abstract

The invention discloses a Beidou B1 frequency point intermediate frequency signal simulation method. A simulation system mainly realizes the satellite signal simulation with in the arbitrarily given simulation time, the arbitrarily given simulated flight track and the arbitrarily given carrier-to-noise ratio. According to the method, the satellite signal transmission delay in the flight track is obtained through carrier flight track and satellite ephemeris resolving, through the delay and the influence of an ionized layer and a convection layer on the delay, ranging codes, navigation messages and carrier waves of corresponding satellites are generated, signals of the multiple satellites are synthesized into one path of signals, then, noise is added, and in addition, filtering, quantization and signal storage are carried out. The influence of the transmission delay calculation quantity on the consumed simulation time is considered, the flight track delay with the period being 0.2ms is calculated in advance, the transmission delay of each sampling point is calculated through interpolation, the precision is ensured, meanwhile, the data storage is greatly saved, and the simulation efficiency is improved.

Description

technical field [0001] The invention discloses a Beidou B1 frequency point intermediate frequency signal simulation method, which belongs to the technical field of satellite navigation system intermediate frequency signal simulation design methods, and specifically relates to a method that considers the influence of signal propagation delay, ionosphere, troposphere, and environmental noise. The intermediate frequency signal is modeled and designed to realize the satellite signal simulation method under the environment of arbitrary flight path and carrier-to-noise ratio. Background technique [0002] The Beidou Satellite Navigation System is referred to as Beidou System, and its English name is BeiDou Navigation Satellite System, abbreviated as BDS. The Beidou system is a global satellite navigation system independently built and operated by China, and compatible with other satellite navigation systems in the world. It can provide all kinds of users with high-precision, high-...

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Application Information

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IPC IPC(8): G01S19/23G01S19/13
Inventor 徐昭李荣冰刘建业谢非曾庆化韩志凤何航平
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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