Frequency counting module and counting method and application

A technology of frequency counting and data acquisition modules, which is applied in the direction of frequency measurement devices, frequency-to-pulse sequence conversion, and measurement devices. It can solve the problems of communication distance reduction and demodulation failure, and achieve good communication effects.

Inactive Publication Date: 2010-11-10
TIANJIN DEVISER ELECTRIC INSTR
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  • Abstract
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AI Technical Summary

Problems solved by technology

In this call mode, a small frequency deviation will lead to a substantial reduction in the actual effective communication distance, and a large frequency deviation will make demodulation impossible

Method used

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  • Frequency counting module and counting method and application
  • Frequency counting module and counting method and application
  • Frequency counting module and counting method and application

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Experimental program
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Embodiment 1

[0020] A frequency counting module comprising

[0021] 1) Data acquisition module: at time 1, A / D (analog-to-digital converter) converts the frequency-converted intermediate frequency signal into data output at a speed of 28.8MHz, and transmits it to the F_RAM1 storage block of FPGA (element programmable logic gate array), DSP (digital signal processor) reads the data in FPGA's F_RAM2 to DSP's internal storage area RAM2 through DMA (direct memory access channel) channel at a speed of about 50M, and at the same time, DSP's CPU (central processing unit) processes the data in RAM1 data;

[0022] At time 2, the A / D sends data to the F_RAM2 memory block of the FPGA, and the DSP transfers the data in the F_RAM1 of the FPGA to the internal storage area RAM1 of the DSP, while the CPU of the DSP processes the data in the RAM2. In this way, the DMA and CPU of FPGA and DSP work in parallel, and the fastest data processing speed under the same hardware configuration can be obtained. The...

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Abstract

The invention discloses a frequency counting module, a frequency counting method and application, and relates to monitoring of carrier frequency variation of signals, in particular to capture of instantaneous AM (amplitude modulation) and FM (frequency modulation) modulation signals and counting output of carrier frequency thereof. The frequency counting module comprises a data acquisition module, a signal capturing module and a frequency counting module. The frequency counting method comprises the steps of data acquisition, signal capturing and frequency counting. The frequency counting module and the frequency counting method are applied to a frequency spectrograph, a field intensity indicator and the like for locking intermediate-frequency signals and a machine for digital sampling, and are used for performing frequency counting on the paroxysmal AM and FM signals so as to bring convenience for double communication parties to adjust the deviation of the carrier signals according tothe test result to obtain the best communication effect.

Description

Technical field: [0001] The present invention relates to the monitoring of the carrier frequency change of the signal, in particular, to the capture of the instantaneous AM (amplitude modulation), FM (frequency modulation) modulation signal and the counting output of its carrier frequency. Background technique: [0002] Current spectrum analyzers and other frequency counting instruments mostly provide frequency counting functions with a fixed counting duration (mostly 1s), but the carrier frequency counting function for AM and FM instantaneous voice signals with a call time between 20ms and 300ms is still blank. In conversational voice communication such as guiding the aircraft to return home, fixed-point search and rescue, etc., the signal is mostly bursty and the signal length is between 20ms-300ms. In this call mode, a small frequency deviation will lead to a substantial reduction in the actual effective communication distance, and a large frequency deviation will make de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/10G01R23/16G01R29/00
Inventor 张艳辉
Owner TIANJIN DEVISER ELECTRIC INSTR
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