Method for detecting observed quantity validity in navigation receiver

A navigation receiver and observation measurement technology, which is applied in the direction of measuring devices, radio wave measurement systems, satellite radio beacon positioning systems, etc., can solve the problems of large amount of calculation, complex algorithms, and inability to detect the correctness of the overall pseudo-range, etc. Achieve the effect of small calculation amount and solve the positioning stability

Active Publication Date: 2015-11-11
BEIJING MXTRONICS CORP +1
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a new method for detecting the validity of observations in a navigation receiver, which overcomes that the lock discriminator in the prior art can only detect the performance of the tracking loop and cannot detect the ov

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  • Method for detecting observed quantity validity in navigation receiver
  • Method for detecting observed quantity validity in navigation receiver
  • Method for detecting observed quantity validity in navigation receiver

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Embodiment Construction

[0018] The invention provides a method for detecting the validity of observations in a navigation receiver, which is characterized in that it comprises the following steps:

[0019] (1) The signal energy detection module estimates the energy size of the received signal, and calculates the carrier-to-noise ratio of the signal;

[0020] (2) In the carrier tracking loop, the carrier tracking lock detection module judges the stability of the carrier tracking;

[0021] (3) The observation collection module extracts the carrier Doppler frequency observation of the carrier tracking loop and the pseudorange observation of the code tracking loop in each epoch;

[0022] (4) The Δpseudorange calculation module calculates the corresponding pseudorange difference between the two epochs before and after using the two observations of carrier Doppler and pseudorange, that is, the Δpseudorange;

[0023] (5) The pseudo-range observation measurement module calculates the difference between thes...

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Abstract

A method for detecting observed quantity validity in a navigation receiver mainly includes: S1. calculating a carrier-to-noise ratio of a signal; S2. judging stability of carrier tracking; S3. Extracting carrier Doppler frequency observed quantity of a carrier tracking loop and pseudo-range observed quantity of a code tracking loop in each epoch; S4. utilizing the two kinds of observed quantity to calculate a pseudo-range difference of corresponding two successive epoch respectively; S5. calculating a difference value of the pseudo-range differences and comparing with a threshold, thereby judging whether pseudo-range observed quantity of the current epoch is correct; S6. summing a difference of delta pseudo ranges of the current epoch and differences of delta pseudo ranges of n previous epochs, comparing with a threshold, and judging whether pseudo range observed quantity is correct; and S7. performing the abovementioned steps on each satellite which keeps tracking, collecting all signals of satellites whose observed quantity is judged to be correct, and inputting the signals to a positioning resolving module. The method provided by the invention does not need redundant information, and solves the problem of positioning stability of a receiver in complex environment with a relatively small calculated amount.

Description

technical field [0001] The invention relates to a baseband signal processing algorithm of a navigation receiver, in particular to a method for detecting the validity of an observation quantity output by a tracking loop in the navigation receiver. Background technique [0002] The internal structure of the navigation receiver is usually divided into three functional modules: radio frequency (RF) front-end processing, baseband digital signal processing (DSP) and positioning and navigation calculations, according to the order of the workflow. Among them, the RF front-end processing module receives the signals of all visible satellites through the antenna, and down-converts the L-band signal to the intermediate frequency (or close to the baseband), then performs sampling and quantization, and inputs the digital intermediate frequency signal to the baseband processing module; the baseband digital signal The processing part mainly captures and tracks visible satellite signals, per...

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Application Information

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IPC IPC(8): G01S19/23G01S19/42
CPCG01S19/23G01S19/42
Inventor 吴雨航赵元富孙永刚由立华
Owner BEIJING MXTRONICS CORP
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