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Time difference of arrival/frequencydifference of arrival estimation method of high- and low-orbit double-star high-time-varying received signals

A technology of receiving signals and time-frequency difference, which is applied in the field of communication, can solve the problems of large time-frequency difference TDOA/FDOA estimation error, low timeliness, and large amount of calculation, so as to achieve good passive positioning accuracy and reliability, and improve real-time performance , the effect of small amount of calculation

Active Publication Date: 2017-06-30
XIDIAN UNIV +1
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Problems solved by technology

The present invention uses high-orbit satellites and low-orbit satellites to realize fast and accurate estimation of the time difference TDOA and frequency difference FDOA of the target signal, and solves the problem of large time-frequency difference TDOA / FDOA estimation error due to large Doppler frequency shift and fast change speed problem, which solves the problem of large amount of calculation and low timeliness when using motion compensation method

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  • Time difference of arrival/frequencydifference of arrival estimation method of high- and low-orbit double-star high-time-varying received signals
  • Time difference of arrival/frequencydifference of arrival estimation method of high- and low-orbit double-star high-time-varying received signals
  • Time difference of arrival/frequencydifference of arrival estimation method of high- and low-orbit double-star high-time-varying received signals

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[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] Refer to attached figure 1 , the specific steps of the implementation of the present invention are described in detail as follows.

[0029] Step 1, collect two periods of data with equal time length.

[0030] At the beginning of data collection, at the same sampling rate, simultaneously collect target signals with equal data length on high-orbit satellites and low-orbit satellites, and use the collected target signals as the first segment of data.

[0031] At the end of the first segment of data collection, at the same sampling rate, simultaneously collect target signals on high-orbit satellites and low-orbit satellites that are equal to the length of the first segment of data, and use the collected target signals as the second segment of data.

[0032] Step 2, jointly estimate the time-frequency difference TDOA / FDOA.

[0033] Using the mutual ambiguity funct...

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Abstract

The invention relates to a time difference of arrival / frequency difference of arrival estimation method of high and low-orbit double-star high-time-varying received signals. The invention aims to solve the problem of large error and large calculation quantity of TDOA (time difference of arrival) / FDOA (frequency difference of arrival) estimation of a high and low-orbit double-star passive positioning system. According to the method of the invention, two segments of data of which the time lengths are equal are adopted to estimate the change rage of frequency difference of arrival, and the estimated values of the TDOA (time difference of arrival) and FDOA (frequency difference of arrival) at the start time point of data acquisition can be calculated accurately. The implementation process of the invention includes the following steps that: (1) two segments of data of which the time lengths are equal are acquired; (2) TDOA and FDOA are jointly estimated; and (3) the estimated values of the TDOA (time difference of arrival) and FDOA (frequency difference of arrival) at the start time point of data acquisition are calculated. With the method of the invention adopted, the fast and accurate estimation of the TDOA and FDOA of high-time-varying received signals in the high and low-orbit double-star passive system can be realized. The method has a high practical value.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a joint fast estimation method of time-frequency difference TDOA / FDOA of a highly time-varying received signal in the technical field of satellite communication countermeasure technology and satellite signal processing. The invention can be used to realize the estimation of TDOA / FDOA oriented to signal source passive positioning through two satellites in high and low orbits. Background technique [0002] At present, the passive positioning method combining TDOA and FDOA has been applied to satellite positioning service platforms such as TLS2000 and SATID in the United States. Due to the different orbits and positions of the two satellites, the distance from the source of the target signal to the two satellites is different, so the time when the signal arrives at the two satellites has a sequence, and the time difference between the arrival of the same signal at the hi...

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Application Information

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IPC IPC(8): G01S19/42
CPCG01S19/425
Inventor 郝本建张冕李赞司江勃万鹏武赵越
Owner XIDIAN UNIV
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