Baseband signal frequency domain narrowband interference detection elimination apparatus and method thereof
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A frequency domain narrowband interference and narrowband interference technology, applied in the field of satellite navigation digital signal processing, can solve the problems of fixed window function, limited detection sensitivity and high design complexity
Active Publication Date: 2016-05-04
WUHAN MENGXIN TECH CO LTD
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[0007] The technical problem to be solved by the present invention is to provide a baseband signal frequency domain narrowband interference detection and elimination device and method, through which the interference detector performs interference detection on an input signal to obtain interference detection information, and outputs it to the narrowband interference eliminator, The narrow-band interference canceller performs narrow-band interference suppression on another input signal according to the interference detection information, so as to solve the problems of high system power consumption, limited detection sensitivity, fixed window function and high design complexity existing in the prior art
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Embodiment 1
[0021] Embodiment 1. A device for detecting and eliminating narrowband interference in the frequency domain of a baseband signal. Combine below figure 1 as well as figure 2 The device provided in this embodiment will be described in detail.
[0022] see figure 1 as well as figure 2 , a baseband signal frequency domain narrowband interference detection and elimination device, the device includes a narrowband interference detector, a programmable controller and a narrowband interference canceller.
[0023] The narrowband interference detector is configured to perform interference detection on another received intermediate frequency signal, obtain interference detection information, and send it to the narrowband interference canceller, the interference detection information specifically includes interference flag information, interference frequency Point index information and window function index information.
[0024] Specifically, the narrowband interference detector spe...
Embodiment 2
[0062] Embodiment 2, a method for detecting and eliminating narrowband interference in the frequency domain of a baseband signal. Combine below image 3 The method provided in this embodiment will be described in detail.
[0063] see image 3 , S1. Divide the intermediate frequency signal into two paths, one path is output to the narrowband interference detector, and the other path is output to the narrowband interference eliminator.
[0064] S2. The narrowband interference detector performs interference detection on a received intermediate frequency signal, obtains interference detection information, and sends it to the narrowband interference canceller, and the interference detection information specifically includes interference flag information, interference frequency point index information and window function index information.
[0065] Said S2 specifically includes the following steps:
[0066] S21. The narrowband interference detector performs windowing processing ...
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Abstract
The invention discloses a baseband signal frequency domain narrowband interference detection elimination apparatus and a method thereof. The method comprises the following steps that an intermediate frequency signal is divided into two paths and is output to a narrowband interference detector and a narrowband interference eliminator respectively; the narrowband interference detector carries out interference detection on one path of the received intermediate frequency signal so as to obtain interference detection information and sends the information to the narrowband interference eliminator. The narrowband interference eliminator carries out narrowband interference elimination processing on the other path of the received intermediate frequency signal according to the interference detection information. By using the narrowband interference detector provided in the invention, whether narrowband interference exists can be detected and index information of an interference frequency point can be provided so that the narrowband interference eliminator only carries out frequency domain filtering on the frequency point with interference. By using the apparatus and the method in the invention, a good narrowband interference restraining effect is possessed, system power consumption can be reduced and high practicality is possessed.
Description
technical field [0001] The invention relates to the technical field of satellite navigation digital signal processing, in particular to a device and method for detecting and eliminating narrow-band interference in the frequency domain of baseband signals. Background technique [0002] The code division multiple access (CodeDivisionMultipleAccess, CDMA) signal is a pseudo-random signal, and the power spectrum spreads to the entire baseband bandwidth, and removing the narrowband interference (NarrowBandInterference) will only slightly damage the CDMA signal. Therefore, CDMA signals have a certain anti-narrowband interference performance. For example, the Global Navigation Satellite System (GNSS) signal itself can resist interference with a 30dB interference-to-signal ratio. Signals are handled correctly. [0003] Narrowband strong interference is a common interference in practical applications, and its suppression can be completed in time domain or frequency domain. The time...
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