Dipper ephemeris collecting method

A Beidou satellite and ephemeris technology, which is applied in the field of satellite navigation, can solve the problem that the patchwork method cannot directly apply Beidou ephemeris data, etc., and achieve the effect of improving sensitivity and high demodulation sensitivity

Active Publication Date: 2014-02-19
杭州中科微电子有限公司
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Problems solved by technology

However, because the polarity of each character in the Beidou message cannot be self-corrected, the

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  • Dipper ephemeris collecting method
  • Dipper ephemeris collecting method
  • Dipper ephemeris collecting method

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Embodiment Construction

[0042] The preferred embodiments of the present invention will be described in detail below in conjunction with the examples.

[0043] figure 1 A schematic diagram of the text structure of the Beidou satellite navigation data D1 in a preferred embodiment of the present invention is shown. Such as figure 1 As shown, 101a, 101b, 101c are main frames, or pages, which last for 30 seconds. A superframe is composed of 24 consecutive main frames, and a superframe lasts for 12 minutes. The main frame 101a can be divided into five subframes, wherein subframe 1, subframe 2, and subframe 3 contain ephemeris data, which are parameters of satellite orbit and time model; subframe 4 and subframe 5 contain almanac, ionization layers and other data. Each subframe is composed of 10 words, and each word uses 2 groups of BCH (15, 11, 1) and interleaved coding.

[0044] The correct and complete subframe 1, subframe 2 and subframe 3 data are called a set of ephemeris data, which is a necessary...

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Abstract

The invention provides a high-sensitive Dipper ephemeris collecting method. When satellite signals are weak, a data demodulating error bit error rate is high. A satellite ephemeris data collecting method with characters as units can improve the ephemeris demodulation sensitivity. Further, sub-frames are segmented into different polar areas composed of a plurality of characters, and a plurality of groups of collected subframe data are compared to modify wrong characters in sub-frames and rectify the polarity of characters of difference polar areas. Consequently, complete subframe data with accurate polarity are collected, and complete ephemeris data are further collected. The Dipper ephemeris collecting method can collect complete Dipper satellite ephemeris data on the condition that a high bit error rate exists, and is high in demodulation sensitivity.

Description

technical field [0001] The invention relates to the technical field of satellite navigation, in particular to a method for collecting Beidou ephemeris. Background technique [0002] A satellite navigation receiver acquires and tracks signals from multiple satellites, then demodulates the navigation data modulated therein. The satellite navigation receiver uses the ephemeris data in the navigation data to solve the satellite position and time model, and then calculate the user's position. [0003] According to the definition of ICD, Beidou satellite navigation data is divided into two types: D1 and D2. The D1 navigation message is composed of a superframe, a main frame and a subframe. Each superframe is 36,000 bits, lasts 12 minutes, and consists of 24 main frames; each main frame is 1,500 bits, lasts 30 seconds, and consists of 5 subframes; each subframe is 300 bits, lasts 6 seconds, and consists of 10 words ; Each word is 20 bits and takes 0.6 seconds. Among them, subfr...

Claims

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Application Information

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IPC IPC(8): G01S19/27
CPCG01S19/27
Inventor 蔺晓龙何文涛冯华星翟昆朋殷明胡晓峰王浩
Owner 杭州中科微电子有限公司
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