RU42112U1 - RADAR SPEED METER - Google Patents

Abstract

The utility model relates to radar speed meters of an object. The device is a speed meter, the principle of which is based on the emission of a microwave signal and the reception of the signal reflected from the object. The utility model allows to increase the accuracy of speed measurement by adding to the circuit a device containing an indication board and a series-connected microwave board and AGC board, an analog-to-digital converter, a fast Fourier transform calculation unit, a filter number finding unit in which a signal with a maximum amplitude is detected, a unit for calculating a speed value and a unit for constructing a speed path.

Description

A utility model relates to a system that uses reflection to determine the speed of an object.

Known radar speed meter containing a power board and a series-connected microwave module, AGC board, processing board, processor board and display board / 1 /.

The disadvantage of the device adopted for the prototype is the low accuracy of speed measurement.

The technical task of the utility model is to increase the accuracy of measuring speed by implementing narrow-band Doppler filtering and constructing a velocity trajectory.

The essence of the utility model lies in the fact that the radar speed meter containing, display board and series-connected microwave module and AGC board, additionally includes series-connected analog-to-digital converter, quick Fourier transform calculation unit, filter number finding unit, in which the signal with the maximum amplitude, the unit for calculating the speed value and the unit for constructing the speed trajectory, the output of which is connected to the input of the display board.

The technical result of the utility model is to increase the accuracy of speed measurement by adding new elements to the device circuit and the formation of new links that provide narrow-band Doppler filtering, which allows speed measurement with high accuracy.

The salient features of a utility model are the following circuit elements:

analog-to-digital converter;

fast Fourier transform calculation unit;

a unit for finding a filter number in which a signal with a maximum amplitude is detected;

a unit for calculating a speed value;

block for constructing a high-speed trajectory.

The figure shows a structural diagram of a device for measuring speed.

Device description

The circuit of the device for measuring speed (Fig.) Includes series-connected microwave module, AGC board, analog-to-digital converter, block for calculating the fast Fourier transform, block for finding the filter number in which the signal with the maximum amplitude is detected, block for calculating the speed value, building block high-speed trajectory and display board.

Description of the device

The microwave module, emits a microwave signal and receives the signal reflected from the object. At its output, a signal is obtained at the Doppler frequency, depending on the speed of the object. In the AGC board, the main signal amplification is carried out, which is converted into a digital form using an analog-to-digital converter and fed to the input of the fast Fourier transform calculation unit. At the output of the filter number finding block, in which the signal with the maximum amplitude is detected, the filter number is formed. In the block for calculating the speed value, the speed of the object is calculated based on the following expression:

where λ is the radiation wavelength; f _d - Doppler frequency. The calculated velocity values enter the block for constructing the velocity trajectory. The view of the trajectory is indicated by the indicator.

Sources of information

1. Distance measuring instrument for the speed of movement of vehicles "BARRIER 2M", publishing house "Kommunar", Zaporizhia, 1991, (prototype)

Claims (1)

A radar speed meter, comprising an indication board and a series-connected microwave board and an AGC board, characterized in that it further comprises a series-connected analog-to-digital converter, a fast Fourier transform calculation unit, a filter number finding unit in which a signal with a maximum amplitude is detected, a calculation unit speed values and a block for constructing a speed trajectory, the output of which is connected to the input of the display board.