CN205374734U

CN205374734U - Speed measuring radar system with self -checking function

Info

Publication number: CN205374734U
Application number: CN201521001622.2U
Authority: CN
Inventors: 贺德溪; 王飞; 杜霜
Original assignee: Anhui Landun Photoelectron Co Ltd
Current assignee: Anhui Landun Photoelectron Co Ltd
Priority date: 2015-12-04
Filing date: 2015-12-04
Publication date: 2016-07-06
Anticipated expiration: 2025-12-04

Abstract

The utility model discloses a speed measuring radar system with self -checking function, a serial communication port, including the frequency source, with the isolator that the frequency source is connected, the isolator with be connected with coupler and quadrature first detector, the coupler with the quadrature first detector is connected, the coupler is connected with the receiving and dispatching antenna, the quadrature first detector is connected with I filtering amplification and Q filtering amplification, I filtering amplification with Q filtering amplification is connected with the AD chip, the AD chip is connected with the treater, be connected with clock crystal, memory chip, display screen, serial ports chip and self -checking switch, the treater through self -checking signal connection extremely the quadrature first detector. The beneficial effect of the utility model: the utility model discloses self -checking function has.

Description

There is the speed-measuring radar system of self-checking function

Technical field

This practicality relates to a kind of speed-measuring radar system, particularly to a kind of speed-measuring radar system with self-checking function.

Background technology

Along with highway communication is fast-developing, the safety problem on highway becomes abnormal severe, drives over the speed limit, the higher main cause being to cause vehicle accident of road accident rate.In order to reduce the vehicle accident and violation phenomenon caused owing to driving over the speed limit, by using velocity radar to detect road speed.Velocity radar is to utilize Doppler effect to measure measuring speed, its use not only makes the measurement of speed more accurate, and also allow for police and enforce the law monitoring, the hypervelocity behavior of detection registration of vehicle, the vehicle accident produced due to hypervelocity is effectively checked by severe punitive measures.Existing velocity radar is in actual production and installation and debugging process, if radar occurs the phenomenon not tested the speed is difficult to judge which partial fault.Often affect engineering and manufacturing schedule.If increasing some test instrumentations to detect, such production cost can increase.

Utility model content

This utility model is for solving a kind of high-performance that radar system of the prior art provides, low cost, the speed-measuring radar system that easy to use, debugging simply has self-checking function without the problem of self-checking function.

This utility model solves above-mentioned technical problem by following technological means: a kind of speed-measuring radar system with self-checking function, it is characterized in that, including frequency source, the isolator being connected with described frequency source, described isolator is connected to bonder and orthogonal mixer, described bonder is connected with described orthogonal mixer, described bonder is connected to dual-mode antenna, described orthogonal mixer is connected to I and amplifies filtering and Q amplification filtering, described I amplifies filtering and is connected to A/D chip with described Q amplification filtering, described A/D chip is connected to processor, described it is connected to clock crystal, storage chip, display screen, serial port chip and self-test switch, described processor is connected to described orthogonal mixer by self-test signal.

The beneficial effects of the utility model: (1) this utility model has self-checking function；(2) integration of modular circuit of the present utility model, miniaturization technology: the reasonable circuit layout of microwave integrated circuit, modules considers, and reduces electromagnetic radiation and electromagnetic coupled, reduces the overall cost of system, improve stability, enhance reliability；(3) self-checking circuit of the present utility model adopts the Wien-bridge oscillator of Design of Amplifiers, quadrature mixer output signal produces agitator self-checking circuit produce sine wave signal through amplifying circuit, detecting circuit, comparison circuit, through amplifying the computing of filtering, A/D conversion and microprocessor, on a display screen or serial ports output speed information, if any module of velocity-measuring system breaks down, cisco unity malfunction, will not display speed on display screen.Display screen can show fault message simultaneously.(4) self-checking circuit produces sine wave signal, through amplifying filtering, A/D conversion and the computing of microprocessor, on a display screen or serial ports output speed information, if any module of velocity-measuring system breaks down, it is impossible to normal operation, and will not display speed on display screen.Display screen can show fault message simultaneously.Meet engineering staff and commissioning staff detects whether velocity radar work is normal.

Accompanying drawing explanation

Fig. 1 is the structural representation that this utility model has the speed-measuring radar system of self-checking function.

1 frequency source 2 isolator 3 bonder 4 orthogonal mixer 5 dual-mode antenna 6I amplifies filtering 7Q and amplifies filtering 8A/D chip 9 processor 10 clock crystal 11 storage chip 12 display screen 13 serial port chip 14 self-test switch 15 self-test signal.

Detailed description of the invention

For the technological means making this utility model realize, creation characteristic, reach purpose and effect and be easy to understand, this utility model is expanded on further.

This utility model embodiment: a kind of speed-measuring radar system with self-checking function, including frequency source 1, the isolator 2 being connected with described frequency source 1, described isolator 2 be connected to bonder 3 and orthogonal mixer 4, described bonder 3 is connected with described orthogonal mixer 4, described bonder 3 is connected to dual-mode antenna 5, described orthogonal mixer 4 is connected to I and amplifies filtering 6 and Q amplification filtering 7, described I amplifies filtering 6 and is connected to A/D chip 8 with described Q amplification filtering 7, described A/D chip 8 is connected to processor 9, described it is connected to clock crystal 10, storage chip 11, display screen 12, serial port chip 13 and self-test switch 14, described processor 9 is connected to described orthogonal mixer 4 by self-test signal 15.

Frequency source produces frequency of oscillation, bonder is connected through isolator, gone out by aerial radiation, and propagate with electromagnetic wave in space, reflect when this electromagnetic wave runs into vehicle in space, the signal reflected is received by dual-mode antenna, orthogonal mixing is carried out with frequency source through bonder, the intermediate frequency two paths of signals carrying doppler information obtained after orthogonal mixing, I road signal and Q road signal, signal is amplified by two paths of signals through filtering and amplifying circuit, then two-way intermediate-freuqncy signal carries out A/D sampling, corresponding noise processed is made by processor, the process of scheduling algorithm is analyzed in frequency transformation, thus realizing the task that the speed of service of vehicle is measured.Direction and speed that vehicle runs can be provided on a display screen.After pressing self-test switch, produce self-test signal and be then passed through amplifying filtering, A/D sampling, deliver in processor and process, on a display screen display speed information, detect whole velocity-measuring system normal operation.Electrical voltage system is to power to whole system.

Described frequency source chooses Gunn diode oscillator, and this oscillator frequency stabilizing degree is good, and phase noise is low, and temperature stability Reliability comparotive is high.In order to make frequency source and coupler circuit coupling, the isolator of a low insertion loss is added at frequency source outfan, utilize the one-way transmission character of isolator, single direction only can be transmitted by signal, the signal of reflection will be absorbed by isolator, mainly prevent the microwave signal launched from reflecting, and improve the frequency stability of agitator.The signal source that the Gunn diode oscillator adopted is a kind of low price and stable performance, reliability is high.

The I/Q orthogonal signalling that described orthogonal mixer produces can provide the direction and speed that vehicle runs, and mixting circuit adopts micro-strip to design, thus enormously simplify circuit, save design cost and circuit space, relative to other speed-measuring radar systems, have more low cost, dynamical feature.

Described filtering and amplifying circuit adopts active device, owing to after orthogonal mixing, output signal ratio is fainter, and noise is more, the signal of mixing output is passed through filtering and amplifying circuit, may amplify the signal to certain limit, strengthen amplitude output signal, reduce noise and interference, it is thus possible to more effective acquisition useful signal, reduce the complexity of back-end processing simultaneously.For ensureing accuracy and the real-time of velocity information, adopting the A/D converter of high accuracy, high conversion speed and low-power consumption to carry out analog digital conversion, thus obtaining high-quality digital signal, carrying out follow-up data process better.

Described self-checking circuit adopt Wien-bridge oscillator, quadrature mixer output signal through amplifying circuit, detecting circuit, comparison circuit produce agitator reference voltage, signal can be produced after pressing self-test switch；Selecting switch mainly detection I road signal or Q road signal, both do not interfere with each other.Self-checking circuit form is simple, be conveniently adjusted, and volume is little, it is simple to the miniaturization of equipment and integrated.

Described storage chip is principally for processor configuration data device, and clock crystal provides clock signal for processor.

At the speed-measuring radar system with self-checking function of the present utility model, self-inspection is mainly by orthogonal mixing output, detection is mixer tube whether normal operation, it is then passed through amplification, detection, comparison circuit, produce the reference voltage of agitator, then press self-test switch and make agitator starting of oscillation, produce frequency of oscillation.Through amplifying filtering, A/D sampling, deliver in processor, show self-inspection speed on a display screen.Speed-measuring radar system of the present utility model, not only production cost is low, compact conformation, and volume is little, and degree of stability is high, function admirable, and convenient detection, circuit performance is reliable.

Of the present utility model ultimate principle, principal character and of the present utility model advantage have more than been shown and described.Skilled person will appreciate that of the industry; this utility model is not restricted to the described embodiments; described in above-described embodiment and description is that principle of the present utility model is described; under the premise without departing from this utility model spirit and scope; this utility model also has various changes and modifications, and these changes and improvements both fall within the scope of claimed this utility model.This utility model claims scope and is defined by appending claims and equivalent thereof.

Claims

null1. a speed-measuring radar system with self-checking function，It is characterized in that，Including frequency source (1)，The isolator (2) being connected with described frequency source (1)，Described isolator (2) is connected to bonder (3) and orthogonal mixer (4)，Described bonder (3) is connected with described orthogonal mixer (4)，Described bonder (3) is connected to dual-mode antenna (5)，Described orthogonal mixer (4) is connected to I and amplifies filtering (6) and Q amplification filtering (7)，Described I amplifies filtering (6) and is connected to A/D chip (8) with described Q amplification filtering (7)，Described A/D chip (8) is connected to processor (9)，Described it is connected to clock crystal (10)、Storage chip (11)、Display screen (12)、Serial port chip (13) and self-test switch (14)，Described processor (9) is connected to described orthogonal mixer (4) by self-test signal (15).