Multi-channel undersampling frequency measurement method for wide bandwidth frequency hopping narrow band signals

Abstract

The invention discloses a multi-channel undersampling frequency measurement method for wide bandwidth frequency hopping narrow band signals. A multi-channel cooperative frequency measurement method isadopted, and measurement on the frequency of the wide bandwidth frequency hopping narrow band signals under an undersampling condition can be realized. The multi-channel undersampling frequency measurement method comprises steps: firstly, multiple signal channels with frequency bands mutually overlapped and capable of meeting a signal frequency hopping range and frequency ambiguity resolution condition are built; signals in each channel are then subjected to over threshold detection, and channels with over threshold are subjected to signal frequency measurement; and finally, an over thresholddetection result and a frequency measurement result are analyzed integrally, frequency ambiguity resolution processing under the undersampling condition is completed, and the signal frequency is obtained. Multiple channels are used for frequency measurement at the same time, measurement on the frequency of the wide bandwidth frequency hopping narrow band signals under the undersampling conditioncan be realized,and in comparison with a frequency measurement method at a Nyquist sampling rate, the data rate is reduced.

Description

technical field [0001] The invention belongs to the field of digital signal processing, and relates to a method for measuring the frequency of a large-bandwidth, frequency-hopping, and narrowband signal under the condition of under-sampling by using a multi-channel signal. Background technique [0002] The Nyquist sampling theorem states that an analog signal in the time domain is converted to a digital signal through an analog-to-digital converter (ADC), and the sampling rate of the ADC must be no less than the Nyquist frequency to avoid frequency aliasing. For wide-bandwidth frequency-hopping narrowband signals, to satisfy the Nyquist theorem, a very high ADC sampling rate is required, which will undoubtedly pay a very high price, and even existing ADC devices cannot meet the frequency-hopping requirements. Therefore, the frequency measurement method under the condition of undersampling has extremely high research significance and practical value. However, frequency measu...

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Problems solved by technology

[0003] The invention proposes a multi-channel under-sampling frequency measurement method for large-bandwidth frequency-hopping narrow-band signals, which effectively solves the problem of frequency ambiguity under under-sampling conditions

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