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Spatio-temporal cascaded method for suppressing external interference of oblique ionogram

An external interference and ionogram technology, applied in the field of ionospheric detection, can solve the problems of signal error or interference can not be removed, reconstructed signal is not used, there are errors, etc., to achieve strong adaptability, preserve signal integrity, reduce background effect of noise

Inactive Publication Date: 2013-08-14
THE 22ND RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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Problems solved by technology

There are two problems in this kind of method: one is that the unreasonable threshold setting will cause the signal to be canceled or the interference cannot be removed; the other is that the reconstructed signal does not use the information of this frequency point, but is only obtained by the method of image interpolation of adjacent frequency points, which is different from the real Signals inevitably contain errors

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  • Spatio-temporal cascaded method for suppressing external interference of oblique ionogram
  • Spatio-temporal cascaded method for suppressing external interference of oblique ionogram
  • Spatio-temporal cascaded method for suppressing external interference of oblique ionogram

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Embodiment 1

[0030] Embodiment 1, this embodiment discloses a method for space-time cascading suppression of external interference in obliquely detecting ionograms, including the following steps:

[0031] (1) Sampling is performed using the transmission gap, and the interference is eliminated by setting the power spectrum threshold, and the noise power is estimated

[0032] (2) Consider an N-element equidistant linear array, the array element spacing is d, and assuming that the array elements are all isotropic array elements, there is a desired signal and p narrow-band interferences in the far field incident as plane waves with a wavelength of λ, reaching The angles are θ 0 and θ k (k=1,2,...,p), the snapshot data received by the transceiver synchronous sampling array can be expressed as X(t),

[0033] X ( t ) = a ( θ 0 ) ...

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Abstract

The invention discloses a spatio-temporal cascaded method for suppressing external interference of an oblique ionogram. The spatio-temporal cascaded method comprises the following steps: estimating noise power; receiving and transmitting snapshot data received by a synchronous sampling array; calculating the covariance matrix after diagonal loading; carrying out spatial filtering; and obtaining the desired signal after iterative operation. The method provided by the invention can make the best of both the empty domain and time domain characteristics of interference, and has the following advantages: the interference suppression capability is stronger and can reach 60 dB when the 16-unit equally spaced line array is adopted; the background noise can be lowered; the empty domain and time domain weight coefficients can be adjusted in a self-adaptive manner, so that the adaptability is stronger; and signal integrity can be effectively maintained.

Description

technical field [0001] The invention belongs to the field of ionospheric detection, in particular to a space-time cascade suppression method for oblique detection of ionogram external interference in the field. Background technique [0002] The oblique detection ionogram records the relationship between the relative group delay (relative propagation time) and frequency of the received signal, and is mainly used to study the ionospheric propagation mode at different times and frequencies, so as to determine the possible propagation mode on a specific link in real time , frequency range and ray distance. When the oblique detection system is required to provide detection information accurately in real time, the extraction of detection graphic information is particularly important. [0003] There are a large number of external interferences in the frequency band of ionospheric oblique detection. Due to the uneven spatial distribution of various interferences, the number, intens...

Claims

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Application Information

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IPC IPC(8): H03H17/00H03H21/00
Inventor 张成峰
Owner THE 22ND RES INST OF CHINA ELECTRONICS TECH GROUP CORP
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