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Non-cooperative navigation satellite identification method based on Doppler frequency shift characteristic

A Doppler frequency shift and navigation satellite technology, applied in the field of orbit determination of non-cooperative spacecraft, can solve problems such as impracticability, achieve the effect of improving recognition ability, improving search efficiency and numerical accuracy, and improving global credibility

Inactive Publication Date: 2015-11-11
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, the premise of this method is to obtain the ephemeris parameters of the satellite to be determined, which cannot be realized when the pseudo code is unknown

Method used

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  • Non-cooperative navigation satellite identification method based on Doppler frequency shift characteristic
  • Non-cooperative navigation satellite identification method based on Doppler frequency shift characteristic
  • Non-cooperative navigation satellite identification method based on Doppler frequency shift characteristic

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Embodiment Construction

[0030] The invention will be described in further detail below in conjunction with the accompanying drawings.

[0031] The method proposed by the present invention can identify navigation satellites under the unknown pseudo code: the radio frequency front end of the low-orbit satellite receiver converts the navigation satellite signal into a digital intermediate frequency signal, and can obtain carrier signals of different frequency shifts after the codeless carrier recovery technology and Measure its Doppler frequency shift; since the initial orbit of the low-orbit user satellite is known, and the ephemeris of the navigation satellite can be noted on the ground, a series of prior values ​​of the Doppler frequency shift can be calculated; The Doppler frequency shift measurement value and prior value containing the receiver frequency difference are arranged into two groups of samples according to the order of high and low, and the frequency difference estimation value is efficie...

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Abstract

The present invention discloses a non-cooperative navigation satellite identification method based on a Doppler frequency shift characteristic, and belongs to the non-cooperative spacecraft orbit determination technology field. The method of the present invention comprises the steps of obtaining the single carrier signals of different frequencies and the Doppler frequency shift measurement values by the codeless carrier recovery; calculating the Doppler frequency shift prior values according to the initial orbit parameters of a low-orbit user satellite and the navigation star ephemerides marked on a cycle; arranging the Doppler frequency shift measurement values containing the receiver frequency difference and the prior values into two sets of samples according to a descending order, and using a dichotomy to find a frequency difference estimated value efficiently to realize the two sets of consistent and corresponding frequencies; according to the proportion of the Doppler frequency shift matching residuals, adopting a global matching and local rejecting method to improve the global credibility of the satellite identification. The method provided by the present invention can identify a navigation satellite, and also can obtain the more accurate receiver frequency difference estimated value.

Description

technical field [0001] The invention relates to a method for identifying non-cooperative navigation satellites based on Doppler frequency shift characteristics, and belongs to the technical field of non-cooperative spacecraft orbit determination. Background technique [0002] In common satellite navigation, the good correlation characteristic of the pseudo-random code is used to identify the navigation satellite by means of pseudo-code matching. However, when the satellite navigation system sends encrypted navigation signals, the code phase cannot be obtained by acquisition, and the initialization of the local code oscillator cannot be completed, so the navigation satellite cannot be identified. [0003] Existing satellite identification technology also has spectrum map comparison to identify satellites. The user conducts spectrum analysis on the received communication satellite signal, and compares the display graphics of the spectrum analyzer with the standard spectrum gr...

Claims

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Application Information

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IPC IPC(8): G01S19/37
CPCG01S19/37
Inventor 卢欢郁丰何真刘莹华冰吴云华陈志明
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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