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Direct Positioning Method Based on Time Difference and Frequency Difference

A positioning method, technology of time difference and frequency difference, applied in positioning, measuring devices, instruments, etc.

Active Publication Date: 2018-09-04
NO 8511 RES INST OF CASIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the dual satellite time difference and frequency difference positioning problem, the time difference information can be obtained by subtracting the TOA (Time of Arrival) of the two signals, so the direct positioning method that has been proposed cannot be used to solve the problem

Method used

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  • Direct Positioning Method Based on Time Difference and Frequency Difference
  • Direct Positioning Method Based on Time Difference and Frequency Difference
  • Direct Positioning Method Based on Time Difference and Frequency Difference

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Embodiment Construction

[0025] A direct positioning method based on time difference and frequency difference of the present invention includes the following steps:

[0026] Step 1: Double satellites intercept signals separately and complete TOA estimation:

[0027] The time and frequency synchronization between the double satellite receiving stations is maintained. The double satellites intercept the signal radiated by the target K times respectively, and the intercepted signal is recorded as In the formula, T is the observation time interval, s k (t) is the original signal intercepted at the kth time, l=1, 2 is the serial number of the satellite receiving station, k=1,..., K is the interception count; b l,k Is the unknown channel attenuation; ω l,k (t) is the stationary white Gaussian noise with zero mean, b l,k , Ω l,k (t), s k (t), r l,k (t) are all plural forms;

[0028] The signal frequency difference is denoted as f l,k = F c [1+μ l,k (P)], Where f c Is the signal carrier frequency, the signal freque...

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Abstract

The invention discloses a direct positioning method based on time difference and frequency difference. In view of a passive dual-satellite time difference and frequency difference positioning problem, the invention discloses a positioning method of firstly determining a target position range based on TDOA (Time Difference Of Arrival) and then based on a FDOA (Frequency Difference Of Arrival) model, the FDOA does not need to be measured, the difficulty of solving the time difference and the frequency difference is avoided, and the positioning precision is higher than that in a method of firstly measuring the FDOA and then performing positioning. Compared with the method of firstly measuring the time difference and the frequency difference and then performing positioning, the method of the invention has the advantages of simple processing and high positioning precision, and particularly in a condition of a low signal to noise ratio, the positioning precision has large advantages. The method does not need to change hardware design of the positioning system only needs to adopt a new positioning algorithm and is applied to engineering application and promotion. The dual-satellite time difference and frequency difference positioning precision can be improved, and a certain reference value is provided for positioning of other platforms and other positioning mechanisms.

Description

Technical field [0001] The invention belongs to the technical field of passive positioning, in particular to a direct positioning method based on time difference and frequency difference. Background technique [0002] The TDOA / FDOA (Time Difference of Arrival / FrequencyDifference of Arrival) positioning system uses two satellites to intercept the signal radiated by the same target. Due to the difference in relative positions, the distance between the target and the two satellites is different. Time exists first. At the same time, the high-speed movement of the satellite produces the Doppler effect, and the Doppler frequency received by the double satellite is also different. By measuring the time difference and frequency difference between the two intercepted signals, the time difference and frequency difference positioning surface can be established to determine the position of the target. Relative time difference positioning system and direction finding positioning system, tim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/02
CPCG01S5/0268
Inventor 朱晓丹陈卓王克让刘志凌董乔忠卢鑫张广宇郑仕力
Owner NO 8511 RES INST OF CASIC
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