Simulation navigation satellite signal stray suppression method

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: 2018-11-27
中国人民解放军火箭军工程大学
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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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  • Simulation navigation satellite signal stray suppression method
  • Simulation navigation satellite signal stray suppression method
  • Simulation navigation satellite signal stray suppression method

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Embodiment

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

[0045] Assuming that the width of the phase accumulator is 27 bits, the phase word is truncated by 13 bits, the phase amplitude look-up table index and the signal amplitude output are both 14 bits wide, the clock frequency is set to 100MHz, and the output sine wave signal frequency is set to Beidou No. 2 B1 frequency point IF 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 register groups is set from 11 to 23. 1000000 sampling points are taken at a sampling rate of 100MHz, and the signal spectrum before and after jitter is as follows figure 2 with image 3 . It can be clearly seen that the bottom noise of the signal spectrum has slightly increased after the jitter is adde...

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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 a simulated navigation satellite. 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 dynamic characteristics of the carrier and the climate environment on the satellite signal. It is an indispensable tool for the development and testing of the receiver. Due to the core commercial interests involved, foreign countries have adopted stricter confidentiality measures for artificial satellite signal synthesis technology. The artificial satellite signal synthesis techniques available in the public literature include 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 synthesis method is simple to cont...

Claims

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Application Information

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Patent Type & Authority Applications(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 中国人民解放军火箭军工程大学
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