Single-station passive quick positioning method based on least square method

A technology of least square method and positioning method, which is applied in the field of signal processing, can solve the problems of long signal stabilization period, long accumulation time, enhanced coherence of reconnaissance and acquisition signals, etc., and achieve the effect of shortening positioning time, fast positioning and improving positioning accuracy

Active Publication Date: 2016-05-11
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

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  • Single-station passive quick positioning method based on least square method
  • Single-station passive quick positioning method based on least square method
  • Single-station passive quick positioning method based on least square method

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[0041] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0042] refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0043] Step 1. Obtain a baseband signal.

[0044] 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.

[0045] Step 2, accumulating baseband signals.

[0046] 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:

[0047] u r1 (t),...

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Abstract

The invention discloses a single-station passive quick positioning method based on a least square method. The single-station passive quick positioning method mainly settles the problems of no enough utilization for radiation source correction, relatively low positioning precision and long positioning time in prior art. The single-station passive quick positioning method comprises the realizing steps of 1, acquiring a baseband signal and performing accumulation for obtaining a baseband signal string; 2, performing matched filtering on the baseband signal string; 3, performing multiple-time interpolation on a matched filtering result and extracting a peak sampling complex signal; 4, extracting the phase information of the peak sampling complex signal and performing least square estimation, and obtaining an optimal chirp rate; 5, performing phase compensation by means of the peak sampling complex signal of the optimal chirp rate; and 6, performing Fourier transform on the compensated signal, thereby obtaining a high-precision direction finding result, computing a radiation source distance according to the high-precision direction finding result, and furthermore obtaining the position of a radiation source. According to the single-station passive quick positioning method, the concept of a synthetic aperture radar is applied on the aspect of reconnaissance positioning. The single-station passive quick positioning method has advantages of high positioning precision and short positioning time. The single-station passive quick positioning method can be used for performing object reconnaissance and interference source positioning.

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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Application Information

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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
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