Single-frequency and multi-frequency GNSS signal narrow-band interference suppression devices, systems and methods

A narrow-band interference and suppression device technology, which is applied in the field of satellite navigation digital signal processing, can solve problems such as large signal attenuation, output signal signal-to-noise ratio loss, and spectrum leakage, and achieve hardware cost reduction, independence, and narrow-band interference suppression. Effect

Inactive Publication Date: 2019-01-15
YONGZHOU GOLDEN ANT NEW ENERGY MASCH CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The first method is a simple interference suppression technology based on FFT/IFFT. The GNSS signal is output after windowing processing, FFT calculation, NBI filtering processing and IFFT calculation. Although this method can remove narrow-band interference, the windowing processing is reducing Spectrum leakage during FFT prevents interference from spreading to other frequency points, and at the same time causes distortion of the input signal, resulting in a loss of the signal-to-noise ratio of the output signal.
[0007] The second method is based on the interference suppression technology of OFFT (Overlapped Fast Fourier Transform, superimposed Fast Fourier Transform). On the basis of the first method, the GNSS signal is divided into two channels, which are respectively delayed by 1/2FFT block length And without delay, windowing, FFT, interference frequency removal, and IFFT are performed independently, and then combined according to a certain algorithm. This method has the advantages of easy design and can filt

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  • Single-frequency and multi-frequency GNSS signal narrow-band interference suppression devices, systems and methods
  • Single-frequency and multi-frequency GNSS signal narrow-band interference suppression devices, systems and methods
  • Single-frequency and multi-frequency GNSS signal narrow-band interference suppression devices, systems and methods

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Example Embodiment

[0044] Embodiment 1. A single-frequency GNSS signal narrowband interference suppression device. Combine below figure 1 The device provided in this embodiment will be described in detail.

[0045] see figure 1 , The device provided in this embodiment includes a delay module, a windowing processing module, an FFT calculation module, an NBI filter processing module, an IFFT calculation module, and a superposition processing module.

[0046] The delay module is used to receive one GNSS signal, and delay it by M / 2 sampling points and output it to the windowing processing module, where M is the length of an FFT block, specifically an exponent power of 2.

[0047] The windowing processing module is used to receive one GNSS signal and the GNSS signal delayed by M / 2 sampling points sent by the delay module, and perform windowing processing on the two time domain GNSS signals respectively.

[0048] Specifically, the windowing processing module is used to receive one GNSS signal, and ...

Example Embodiment

[0056] Embodiment 2. A method for suppressing narrow-band interference of single-frequency GNSS signals. Combine below figure 2 The method provided in this embodiment will be described in detail.

[0057] see figure 1 and figure 2 , S301. Divide the single-frequency time-domain GNSS signal into two paths, wherein one path signal is delayed by M / 2 sampling points, and the other path signal is not delayed, and the delayed and undelayed two-path GNSS signals are respectively windowed deal with.

[0058] Specifically, the single-frequency time-domain GNSS signal is divided into two paths, and the delay module receives one of the signals and delays it by M / 2 sampling points, and sends the delayed GNSS signal to the windowing processing module, so The windowing processing module receives another GNSS signal and the delayed GNSS signal of M / 2 sampling points sent by the delay module, and multiplies it by the same windowing coefficient obtained by searching in the windowing functi...

Example Embodiment

[0064] Embodiment 3, a multi-frequency GNSS signal narrowband interference suppression system. Combine below figure 1 as well as image 3 The system provided in this embodiment will be described in detail.

[0065] see figure 1 and image 3 , the system provided by this embodiment includes a single-frequency GNSS signal narrowband interference suppression device and at least one preprocessing module, at least one cache processing module, at least one cache control module, multiplexing module, demultiplexing module and time division multiplexing control module .

[0066] The preprocessing module includes a format conversion unit and a signal detection unit for receiving unprocessed GNSS signals, and the format conversion unit converts GNSS signals of different bit widths and different encoding formats into the same GNSS signal in the RF clock domain Bit width and encoding format, the signal detection unit performs interference signal detection on the format-converted GNSS ...

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Abstract

The invention discloses single-frequency and multi-frequency GNSS signal narrow-band interference suppression devices, systems and methods, wherein the multi-frequency GNSS signal narrow-band interference suppression system comprises at least one pre-processing module, at least one cache processing module, at least one cache control module, at least one delay module, a multiplexing module, a windowing processing module, a FFT calculation module, a NBI filter processing module, an IFFT calculation module, a demultiplexing module, at least one overlapped processing module and a time division multiplexing control module. According to the single-frequency and multi-frequency GNSS signal narrow-band interference suppression devices, systems and methods in the invention, narrow-band interferencesuppression on single-frequency and multi-frequency GNSS signals can be carried out; the suppression effect is good; furthermore, the hardware resource cost and the system power consumption can be reduced; and the practicability is relatively high.

Description

technical field [0001] The invention relates to the technical field of satellite navigation digital signal processing, in particular to a single-frequency and multi-frequency GNSS signal narrowband interference suppression device, system and method thereof. Background technique [0002] Global Navigation Satellite System (GNSS) signals provide all-weather, real-time, continuous high-precision position information, speed and time information around the world, and play an increasingly important role in people's lives. [0003] GNSS signals adopt spread spectrum communication technology, which has strong anti-interference ability, and its anti-interference ability is determined by the spread spectrum processing gain and bandwidth. However, in actual communication, the anti-interference ability of spread spectrum communication is limited due to the limitation of signal transmission power, equipment implementation cost and the cost of increasing bandwidth. The GNSS signal arrivi...

Claims

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Application Information

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IPC IPC(8): G01S19/21G01S19/37
CPCG01S19/21G01S19/37
Inventor 潘致利
Owner YONGZHOU GOLDEN ANT NEW ENERGY MASCH CO LTD
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