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A Spurious Suppression Method for Simulated Navigation Satellite Signals

A navigation satellite and signal technology, applied in the field of signal processing, can solve problems such as navigation satellite signal spurious, and achieve the effect of avoiding the deterioration of phase resolution and improving the effect significantly.

Active Publication Date: 2020-11-06
ROCKET FORCE UNIV OF ENG
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] Aiming at the problems existing in the prior art, the object of the present invention is to provide a method for suppressing spurious signals of simulated navigation satellites, which uses a plurality of linear feedback shift register groups to solve the navigation problem without increasing the storage space. Spurious Problems of Satellite Signals

Method used

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  • A Spurious Suppression Method for Simulated Navigation Satellite Signals
  • A Spurious Suppression Method for Simulated Navigation Satellite Signals
  • A Spurious Suppression Method for Simulated Navigation Satellite Signals

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Embodiment

[0044] In this embodiment, a full-digital software simulation comparison is performed on the single-frequency intermediate-frequency carrier signal synthesized before and after dithering.

[0045] Assume that the phase accumulator width is 27 bits, the phase word is truncated to 13 bits, the phase amplitude lookup table index and signal amplitude output are both 14 bits wide, the clock frequency is 100MHz, and the frequency of the output sine wave signal is set to the Beidou-2 B1 frequency point intermediate frequency The signal frequency is 21.098MHz. The jitter generator generates a pseudo-random number with a width of 13 bits, and the order of multiple shift linear feedback shift registers is set from 11 to 23. At a sampling rate of 100MHz, 1,000,000 sampling points are taken, and the signal spectrum before and after adding jitter is as follows: figure 2 and image 3 . It can be clearly seen that the noise floor of the signal spectrum increases slightly after dithering i...

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Abstract

The invention discloses a simulation navigation satellite signal stray suppression method. According to the method, a plurality of linear feedback shift register groups are adopted, the generated jitter signal does not have a single periodicity, and the jitter is more noisy, so that the effect of improving the stray is more obvious; and the plurality of jitter sequences are added to the low levelof the phase words, the phase noise introduced by jitter is prevented from being larger than the phase error generated by quantization, and therefore the phase resolution of the signal is prevented from deteriorating.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and relates to a method for suppressing spurious signals of simulated navigation satellites. Background technique [0002] The satellite signal simulator simulates the satellite signal received by the front end of the receiver according to the influence of the carrier dynamic characteristics, climate environment and other factors on the satellite signal. It is an indispensable and important tool for receiver development and testing. Due to the involvement of core commercial interests, foreign countries have adopted stricter confidentiality measures for the simulation satellite signal synthesis technology. There are two types of simulation satellite signal synthesis technologies available in open literature: Digital Delay Filter (Digital Delay Filter) and Direct Digital Synthesis (Direct Digital Synthesis, DDS). Among them, compared with the delay filter technology, the DDS signal synth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/23
CPCG01S19/23
Inventor 侯博王海洋范志良龚博文姚志成王乐刘鑫昌汪洪桥吴智慧张盛魁
Owner ROCKET FORCE UNIV OF ENG
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