Method for estimating weak signal separation on basis of positioning for external radiation sources

A weak signal, external radiation source technology, applied in the field of signal processing, can solve problems such as inability to estimate, and achieve the effect of positioning and tracking

Inactive Publication Date: 2013-08-07
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, when the azimuth of the co-channel interference signal and the target is relatively close, the traditional method will also filter out the target at the same time, and can no longer effectively estimate the parameters of the target

Method used

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  • Method for estimating weak signal separation on basis of positioning for external radiation sources
  • Method for estimating weak signal separation on basis of positioning for external radiation sources
  • Method for estimating weak signal separation on basis of positioning for external radiation sources

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Embodiment Construction

[0022] The signal processing flow is as figure 2 Shown:

[0023] Step 1: The receiver performs band-pass sampling on the main channel array modulation signal to be processed and the modulation signal received by the reference antenna to obtain the main channel sampling sequence x(t) and reference sampling sequence s ref (t), wherein t represents the sampling moment, and the sampling length is L;

[0024] Step 2: For the main channel sampling sequence x(t), use the normalized least mean squares NLMS to implement direct wave and multipath cancellation to obtain the output signal output signal y NLMS (t); Direct wave and multipath cancellation are well-known techniques in the existing same-frequency interference signal suppression method, and are not repeated here;

[0025] Step 3: Use Akaike information criterion AIC or minimum description length MDL criterion to output signal y NLMS (t) Estimating the number of source signals, estimating the number M of source signals, and ...

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Abstract

The invention provides a method for estimating weak signal separation on the basis of positioning for external radiation sources. The method includes steps of performing direct-wave and multi-path cancellation for a sample sequence x (t) of a main channel by means of NLMS (normalized least mean square) to obtain output signals y<NLMS>(t); estimating the number of source signals of the output signals y<NLMS>(t) by an AIC (Akaike information criterion) or an MDL (minimum description length) criterion, preliminarily whitening the output signals y<NLMS>(t) to obtain whitened signals z(t), and updating a separation matrix W by an ICA (independent component analysis) algorithm to obtain M channels of estimated signals y(t); respectively performing time-frequency two-dimensional correlation for the M channels of estimated signals y<1>(t), ..., y<M>(t) and reference signals s<ref>(t); and searching a peak point in absolute correlation values phi(tau, f) corresponding to the M channels of estimated signals, and determining time delay and Doppler frequency shift which correspond to the peak point as time delay and Doppler frequency shift of a target when a signal-to-noise ratio of a certain channel of signals is larger than or equal to a threshold value.

Description

technical field [0001] The invention belongs to signal processing technology, in particular to weak signal separation technology. Background technique [0002] Passive positioning technology, due to the separation of sending and receiving, does not actively transmit signals, but only passively receives information from external radiation sources to achieve positioning. Compared with the active positioning method, the passive positioning method has a long range, strong interference ability, and the ability to covertly receive, locate and track the target. Passive positioning technology can be divided into radiation source positioning and external radiation source positioning. Radiation source positioning is mainly based on the signal radiated by the target itself. External radiation source positioning is based on third-party radiation or external radiation. Generally, civilian TV signals, broadcast signals, communication signals, and satellites with known geographic location...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
Inventor 李万春张和发李莽李立萍魏平
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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