Medium-high frequency wave spread-spectrum navigation system distance observed quantity extraction method

A technology of a navigation system and an extraction method is applied in the field of extraction of distance difference observations between two transmitting stations and a receiving carrier, and can solve problems such as large errors and ambiguity in the whole circle.

Inactive Publication Date: 2008-07-09
HARBIN ENG UNIV
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Problems solved by technology

[0003] The purpose of this invention is to provide a method for extracting distance difference observations of a medium-short wave spread spectrum navigation system, to solve the problem that the existing technology simply extracts distance observations from the pseudo-code tracking loop. Observations have the problem of integer ambiguity

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  • Medium-high frequency wave spread-spectrum navigation system distance observed quantity extraction method
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  • Medium-high frequency wave spread-spectrum navigation system distance observed quantity extraction method

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specific Embodiment approach 1

[0047] Specific Embodiment 1: The present embodiment will be specifically described below with reference to FIG. 1 . This embodiment is realized through the following steps: 1. Extraction of the phase observation of the pseudo code; this step includes first extracting the distance observation of half a chip order from the acquisition loop of the pseudo code, and then extracting the observation from the tracking loop of the pseudo code Distance observations less than half a chip;

[0048] The specific method of extracting the distance difference observation of the order of half a chip from the acquisition branch is as follows: set T c It is a symbol width, unit: second; for different navigation station signal local codes, slide k respectively i Acquisition of the signal is completed once, and i corresponds to different transmitting stations (i=1, 2, 3...); taking the two navigations of i=1, 2 as an example, two navigation stations and half a chip amount of the receiver can be ...

Embodiment approach 2

[0099] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in step 1, in order to eliminate the jitter of the distance measurement value caused by the jitter of the pseudo-code tracking ring, the distance difference of the pseudo-code is averaged before calculating the entire cycle to eliminate Jitter error; due to the dynamic nature of the receiving carrier, when measuring the distance measurement value of the pseudo-code, the principle of offsetting the dynamic change of the pseudo-code carrier observation amount is used for averaging, that is, the change of the pseudo-code observation amount and carrier observation amount due to the carrier dynamics It is consistent. When the tracking loop is refreshed every time, the pseudo-code distance difference observation is subtracted from the carrier distance difference observation and then accumulated and averaged, thereby eliminating the influence of carrier dynamics. For example, at time t1, the receiver ...

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Abstract

A method for extracting observation amount of distance difference in medium- and short-wave spread spectrum navigation system relates to a method for extracting observation amount of distance difference between two transmitters and a receiving carrier, which solves the problems of large error of distance observation amount singly extracted by prior art from pseudo code tracking ring and integer ambiguity of distance observation amount singly extracted by carrier wave signal tracking ring. The method comprises the following steps: determining integer of carrier waves according to the distance difference observation amount extracted by pseudo code phase; and extracting the decimal fraction portion of the distance different observation amount by a carrier wave phase tracking ring to achieve high-accuracy observation amount extraction of carrier wave phase. According to the invention, the accuracy of the integer is verified by the change tendency of the distance difference observation amount obtained by changing relative interval of pseudo code tracking ring, and the distance difference observation amount of pseudo codes in dynamic environment is averaged according to the principle that the dynamic changes of carrier wave observation amount of the pseudo code can be canceled, thus further improving the accuracy of distance difference observation amount of the pseudo code for determining carrier wave integer.

Description

technical field [0001] The invention belongs to the field of medium and short-wave radio navigation adopting a single-frequency system spread spectrum method, and specifically relates to a method for extracting distance difference observations between two transmitting stations and receiving carriers. Background technique [0002] The spread spectrum system is widely used in radio navigation systems, such as GPS, because of its strong anti-interference ability, strong confidentiality, code division multiple access and high-precision measurement. As the key technical equipment in the radio navigation system, the spread spectrum receiver completes the acquisition, tracking and data demodulation of the spread spectrum navigation signal by receiving the signals transmitted by different navigation stations, and measures the distance or distance between the receiving carrier and the transmitting station through the signal tracking loop. The pairwise distance difference realizes the...

Claims

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Application Information

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IPC IPC(8): G01S5/14G01S1/02G01S19/29G01S19/30
Inventor 徐定杰沈锋郝燕玲黄平薛冰王伟韦金辰
Owner HARBIN ENG UNIV
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