Narrow-band interference resisting system based on cascaded wave traps
A technology of interference system and wave notch filter, which is applied in the field of satellite navigation, can solve the problems of satellite navigation system performance impact, limited improvement of system interference tolerance, and influence on receiver capture and tracking signal sensitivity, so as to reduce broadband signal damage and improve Capturing the effect of tracking ability and easy engineering realization
Inactive Publication Date: 2014-12-17
NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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Problems solved by technology
[0003] (1) Removing interference signals in the time domain requires real-time processing of received signals, which will lead to a significant increase in circuit scale, power consumption and other indicators, which limits engineering implementation
[0004] (2) Removing interference signals in the frequency domain will usually cause damage to the satellite navigation signal itself, resulting in a decrease in the signal-to-noise ratio, an increase in the bit error rate, and a limited improvement in the interference tolerance of the system
[0005] (3) The convergence speed of the anti-jamming algorithm will directly affect the sensitivity of the receiver to capture and track signals, and has a key impact on the performance of the entire satellite navigation system
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[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.
[0018] The present invention is an interference suppression algorithm structure based on multi-cascaded complex notch filters. By taking the first-order self-adaptive complex notch filters as a unit and selecting a suitable convergence coefficient and cascading structure, the solution in the satellite navigation receiver is realized. Calculate the suppression of the narrowband interference signal by the front end.
[0019] The modulation method of spread spectrum communication is IQ modulation. The actual signal is divided into two orthogonal signal transmission channels. Each sampling point is a complex number, and its spectrum is similar to Gaussian white noise, so it can be processed by a complex adaptive notch filter. The complex adaptive notch filter structure of figu...
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The invention provides a narrow-band interference resisting system based on cascaded wave traps. A received signal x(k) firstly passes through a first wave trap so that an output e(k) can be obtained; the output e(k) is used for controlling the iteration updating of a first wave trap parameter omega 1(k) by use of a first self-adaptive iteration module, and meanwhile, the output e(k) is taken as an input to a second wave trap, and then a final output signal y(k) can be obtained; the output signal y(k) is used for controlling the iteration updating of a second wave trap parameter omega 2(k) by use of a second output signal; the first wave trap parameter omega 1(k) and the second wave trap parameter omega 2(k) are used for controlling the complex coefficients of the first wave trap and the second wave trap, respectively. The narrow-band interference resisting system based on the cascaded wave traps has the characteristics of higher anti-interference margin, higher convergence rate, lower signal loss, and realization of miniaturized, low-power and chip circuits.
Description
technical field [0001] The invention belongs to the technical field of satellite navigation, and relates to an anti-narrow-band interference system applied to a satellite navigation receiver system. Background technique [0002] In the satellite navigation system, because the power of the satellite signal is very low, usually lower than the space white noise, it is easily affected by external hostile and non-hostile interference signals or harmonics in the same frequency band during space propagation, causing the receiver to receive signal distortion. , the normal solution and positioning function cannot be completed, so the anti-jamming technology is the key technology in the satellite navigation system. In the current anti-interference signal processing method, there are mainly the following key problems: [0003] (1) Removing interference signals in the time domain requires real-time processing of received signals, which will lead to a significant increase in circuit sca...
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IPC IPC(8): G01S19/21
CPCG01S19/21
Inventor 胡霄张琦张文华张帆陈永良
Owner NO 20 RES INST OF CHINA ELECTRONICS TECH GRP