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Frequency domain de-interference method and device based on two-stage adaptive threshold decision

An adaptive threshold and anti-interference technology, which is applied in the field of satellite navigation anti-interference, can solve the problem of large interference suppression loss and achieve the effect of accurate frequency domain anti-interference

Inactive Publication Date: 2018-08-10
BEIJING RINFON TECH CO LTD
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[0007] It can be seen from the above formula that since the energy of the signal is the largest at the center frequency, under the condition of a certain interference bandwidth, when the offset Δf between the interference center frequency and the signal carrier is 0, the interference suppression loss is the largest

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  • Frequency domain de-interference method and device based on two-stage adaptive threshold decision

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[0093] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be constrained by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0094] Those skilled in the art will understand that unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of said features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or mo...

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Abstract

The invention relates to a frequency domain de-interference method and a device thereof based on a two-stage adaptive threshold decision, wherein the method comprises the following steps of: receivinga useful signal and an interference signal, processing both signals into a zero intermediate frequency signal, and windowing in two ways; performing FFT transformation to the two-way windowed data streams, and acquiring the frequency band portion of the useful signal; performing an iterative operation on the power of the useful signal, dividing the iteratively filtered power signal into a plurality of power blocks, calculating a peak-to-average ratio of the power blocks, and setting a decision threshold adjustment factor according to the peak-to-average ratio of the power blocks; calculatingan interference detection threshold to calculate all position indexes exceeding the threshold, and performing de-interference to obtain the data after interference suppression; sequentially performingthe IFFT transformation, inverse windowing processing and truncating of both ends of the data on the data after interference suppression, so as to acquire time domain intermediate signals; overlapping and outputting the two-way time domain intermediate signals. The method and system provided by the invention are capable of more accurately addressing the effects of narrowband and mid-band interference on signal quality.

Description

technical field [0001] The invention relates to the field of satellite navigation anti-interference, in particular to a method and device for frequency domain anti-interference based on two-stage adaptive threshold judgment. Background technique [0002] The modern satellite navigation system generally adopts the direct sequence spread spectrum communication system. Using a wide working frequency band to transmit low-rate message information can effectively improve the system's ability to de-interference and reduce the probability of signals being intercepted by the enemy. However, the navigation satellite is far away from the ground, and due to the limited transmission power on the satellite, the navigation signal is already very weak when it reaches the ground. In a strong interference environment, the limited spread spectrum processing gain is difficult to guarantee the normal operation of the navigation receiver. As satellite navigation is more and more widely used in ...

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Application Information

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IPC IPC(8): H04B1/00H04B1/69H04B1/7097H04B1/71H04L27/26
CPCH04B1/0007H04B1/69H04B1/7097H04B1/71H04L27/2614
Inventor 熊军王旭那成亮童长海
Owner BEIJING RINFON TECH CO LTD
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