The invention discloses an edge detection method and system and a clock and data recovery circuit based on an FPGA (Field Programmable Gate Array), and relates to the technical field of communication. The method comprises the following steps: performing over-sampling and delay processing on a received data signal by a local reference clock, and generating a rising edge pulse signal and a falling edge pulse signal based on the data signal being subjected to the over-sampling and delay processing, wherein the rising edge pulse signal comprises a plurality of rising edge pulses, and the falling edge pulse signal comprises a plurality of falling edge pulses; performing statistics to obtain the quantity N of local reference clock periods after the rising edge pulses and the quantity M of the local reference clock periods after the falling edge pulses respectively; and judging that the rising edge pulses are valid rising edge pulses when (M-N) is greater than a set threshold, and judging that the falling edge pulses are valid falling edge pulses when (N-M) is greater than the threshold. Through adoption of the edge detection method and system and the clock and data recovery circuit, the valid rising edge pulses and the valid falling edge pulses can be detected, and the accuracy and reliability of data signal sampling are improved.

Edge detection method and system and clock and data recovery circuit based on FPGA (Field Programmable Gate Array)

The invention relates to a WIFI signal suppression method and apparatus in an unmanned aerial vehicle detection platform. The method comprises the following steps: performing signal detection on an unmanned aerial vehicle to obtain the power of a detection signal; comparing the power of the detection signal with a power threshold, judging whether the detection signal comprises a WIFI signal according to the comparison result, and if so, filtering the detection signal. That is, by adoption of the WIFI signal suppression method and apparatus provided by the invention, the false alarm rate of anunmanned aerial vehicle detection system is reduced, the detection accuracy is improved, and the detection performance of the unmanned aerial vehicle detection platform is improved.

WIFI signal suppression method and apparatus in unmanned aerial vehicle detection platform

The invention discloses a data storage method for a transmission signal. The method includes the following steps: when the transmission signal is received, analyzing a clock signal corresponding to the transmission signal to obtain a signal frequency of the clock signal; acquiring a zero volt time point of the clock signal after performing signal superposition with the transmission signal according to the signal frequency; acquiring a preset time length, and generating a data storage period taking the zero volt time point as a central time point according to the zero volt time point and the preset time length; and storing data of the transmission signal in the data storage period. The invention also discloses a data storage device for the transmission signal and a computer readable storagemedium. The scheme of the invention aims to solve the problem of inaccurate data extraction of the transmission signal, and improves the accuracy of the data extraction of the transmission signal bystoring the data of the transmission signal in the data storage period.

Data storage method and device for transmission signal and storage medium

The invention relates to a radar signal real-time detection method. The method is characterized by comparing an average amplitude of N sampling points before a certain moment with the amplitude of thesampling point at the moment, and if the amplitudes of the plurality of sampling points after starting of the certain moment are continuously a certain value higher than the average amplitude in a previous certain period of time, considering that a signal rising edge exists at the moment; otherwise, if the amplitudes of the plurality of continuous sampling points after a certain moment is startedare a certain value lower than the previous average amplitude, considering that a falling edge exists at the moment; and when both the falling edge and the rising edge exist, intercepting a signal part existing in data immediately. Whether a signal exists is detected in a mode of judging the rising edge and the falling edge in a time domain, and an effect of detecting the signal in real time under a passive condition can be achieved by setting reasonable parameters and thresholds.

Radar signal real-time detection method

The invention relates to a pulse signal energy detection system and method based on a digital receiver. A digital receiver system includes an antenna module or signal input connection equipment, an analog channel front-end module, an ADC digital-to-analog converter, a DDC down conversion module, a digital signal processing module and a data output module. The energy detection system includes a signal input module, filter modules, instantaneous energy calculation modules, peak calculation modules, energy accumulation modules, average value calculation modules, energy comparison modules, quasi-peak calculation modules and data output control modules. The system can overcome the problem that calculation on three types of energy values of pulse signal energy in an electromagnetic interferencemeasurement receiver is difficult, consumed time is long, and achieve the purpose of realizing multi-channel fast calculation in the digital receiver.

Pulse signal energy detection system and method based on digital receiver

The invention provides a pulse signal detection system, comprising a preprocessing unit, a threshold detection and a condition screening unit; the signal processing unit comprises an envelope detection module, a signal-noise ratio estimation module and a smoothing filter module, the threshold detection unit comprises a threshold calculation module and an edge detection module, the condition screening unit comprises a noise burring module, an amplitude gap elimination module, a power condition screening module and a time condition screening module The pulse signal detection system and method designed herein provide various threshold types, allow pulse signals to be detected quickly and accurately, and allow the pulse signals with specified power and time characteristic conditions to be screened and detected

Wang Baorui

Papers

Pulse signal detection system and method