Single-station passive rapid positioning method based on phase difference and least square method
A least square method and phase difference technology, applied in the field of signal processing, can solve problems such as long accumulation time, long signal stabilization period, enhanced coherence of reconnaissance acquisition signals, etc., and achieve the effect of improving positioning accuracy and shortening positioning time
Active Publication Date: 2016-06-15
XIDIAN UNIV
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Problems solved by technology
However, with the development of modern radar technology, the stability of the radio frequency source of the radar has been significantly improved; in the imaging, space-time processing and other modes of the radar, there will be a longer signal stabilization period, and the coherence of the reconnaissance signal will be significantly enhanced.
Conventional single-station positioning methods cannot effectively utilize signal correlation and require a long accumulation time
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[0044]The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0045] refer to figure 1 , the specific implementation steps of the present invention are as follows:
[0046] Step 1. Obtain a baseband signal.
[0047] The invention adopts the reconnaissance equipment that moves in a straight line at a uniform speed, and performs instantaneous frequency measurement and direction measurement on the received signal to obtain the frequency measurement result and direction finding results and use the frequency measurement results Perform frequency mixing to eliminate the carrier frequency to obtain the baseband signal u r (t), the frequency measurement error requirement is low, less than 1MHz.
[0048] Step 2, accumulating baseband signals.
[0049] For baseband signal u r (t) Accumulate, that is, store the baseband signal obtained by each frequency mixing, and accumulate a set of baseband signals:
[0050] u r1 (t)...
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The invention discloses a single-station passive rapid positioning method based on phase difference and a least square method, and mainly solves the problems that the correlation of radiation sources are not sufficiently used, the positioning precision is relatively low and the positioning time is long in the prior art. The method comprises the steps that baseband signals are obtained and accumulated to obtain a baseband signal string; matched filtering is carried out on the baseband signal string, multiple interpolation is carried out on a result of matched filtering, and a peak sampling complex signal is extracted; phase difference is carried out on the peak sampling complex signal, and the least square method is used to estimate an optimal modulation frequency; phase compensation is carried out on the peak sampling complex signal by utilizing the optimal modulation frequency; Fourier transformer is carried out on a compensated signal to obtain a high-precision direction finding result; and according to the high-precision direction finding result, the distance to a radiation source is calculated, and further the position of the radiation source is obtained. According to the invention, the concept of synthetic aperture radar is applied to the aspect of investigation and positioning, the method has the advantages of high positioning precision and short positioning time, and the method can be used to investigate targets and position interference sources.
Description
technical field [0001] The invention belongs to the technical field of signal processing, in particular to a passive positioning method, which can be used for single-station reconnaissance. Background technique [0002] Passive positioning means that a single reconnaissance device or multiple reconnaissance devices detect the scattering source or radiation source and obtain relevant positioning parameters, and use appropriate data processing methods to determine the location of the scattering source or radiation source in three-dimensional space. Location. [0003] Passive positioning can be simply divided into multi-station positioning and single-station positioning. Multi-site positioning achieves the purpose of positioning through the fusion of signal level or data level of target radiation signals received by sites deployed in different geographical locations. It is widely used in the positioning of communication equipment; while radar transmitting antennas often have ...
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Login to View More IPC IPC(8): G01S5/02
CPCG01S5/02
Inventor 刘高高鲍丹朱光前武斌秦国栋蔡晶晶
Owner XIDIAN UNIV