CN205608178U - Short range range radar system - Google Patents

Abstract

The utility model relates to a short range range radar system, the system is including the signal generator who is used for producing the transmission signal, signal generator's output links to each other with emit antenna, emit antenna is used for the transmission the transmission signal, the system is still including the receiving antenna and the 2nd receiving antenna that are used for receiving received signal, a receiving antenna and the 2nd receiving antenna's output links to each other with first receiver and second receiver respectively, the output of first receiver and second receiver links to each other with signal processor respectively, signal processor includes two outputs, and one of them output links to each other with backstage computing machine, and another output links to each other with signal generator. The utility model discloses can the precision measurement target distance and the angle, and the simple structure of system, low cost.

Description

A kind of short range range radar system

Technical field

This utility model relates to Radar Technology field, is specifically related to a kind of short range range radar system.

Background technology

Short range range radar system does not require nothing more than high range accuracy, also requires high-precision measurement target angle Degree, and be for multiple targets.The most general radar using big bandwidth system realizes high accuracy and surveys Away from, but the radar of big bandwidth system cannot realize high-precision measurement angle on target, and system complex, Cost is high.

Utility model content

The purpose of this utility model be to provide a kind of can the most high-precision measurement target range and angle Short range range radar system, and described radar system is simple, low cost.

For realizing above-mentioned utility model purpose, this utility model provides a kind of short range range radar system, Described system include for produce launch signal signal generator, the outfan of described signal generator with Transmitting antenna is connected, and described transmitting antenna is used for launching described transmitting signal；Described system also include for Receiving the first reception antenna and second reception antenna of signal, described first reception antenna and second connects The outfan receiving antenna is connected with the first receiver and the second receiver respectively, described first receiver and the The outfan of two receivers is connected with signal processor respectively, and described signal processor includes two outputs End, one of them outfan is connected with hind computation datatron, and another outfan is connected with signal generator.

Preferably, described first reception antenna, the second reception antenna and described transmitting antenna are provided separately.

As shown from the above technical solution, use the first reception antenna and the second reception antenna two reception simultaneously Antenna receives signal, and such two-way receives signal and demodulates through the first receiver and the second receiver respectively After, meeting each generation one road I, Q signal are to signal processor；So carry out at signal at signal processor Can produce during reason that more fuzzy distance data are not for calculating target range, precision is higher, target angle Degree can use double antenna phase contrast angle-measuring method, can accurately measure angle on target.This short range range radar system System simple in construction, with low cost.

Accompanying drawing explanation

Fig. 1 is the structural representation of an embodiment of this utility model short range range radar system.

Fig. 2 is the frequency transformation that the Multiple-Frequency Continuous Wave that this utility model uses in actual applications launches signal Time diagram.

Fig. 3 be this utility model in actual applications, launch the frequency hopping wave band that is made up of 4 frequencies of signal Time diagram.

Fig. 4 is the schematic diagram of the angle measurement method that this utility model uses in actual applications.

Detailed description of the invention

Below in conjunction with the accompanying drawing in this utility model embodiment, to the technology in this utility model embodiment Scheme is clearly and completely described, it is clear that described embodiment is only this utility model one Divide embodiment rather than whole embodiments.Based on the embodiment in this utility model, this area is common The every other embodiment that technical staff is obtained under not making creative work premise, broadly falls into this The scope of utility model protection.

Refer to Fig. 1, the short range range radar system that this utility model embodiment provides, described system bag Include for producing the signal generator 40 launching signal, the outfan of described signal generator 40 and transmitting Antenna 10 is connected, and described transmitting antenna 10 is used for launching described transmitting signal；Described system also includes using In the first reception antenna 20 and the second reception antenna 30 of reception signal, described first reception antenna 20 are connected with the first receiver 50 and the second receiver 60 respectively with the outfan of the second reception antenna 30, Described first receiver 50 is connected with signal processor 70 respectively with the outfan of the second receiver 60, Described signal processor 70 includes two outfans, one of them outfan and hind computation datatron 80 Being connected, another outfan is connected with signal generator 40.Described first receiver 50 and described second connects Receipts machine 60, is respectively used to demodulated received signal, and respectively produce a road I, Q signal (as shown in Figure 1 I1, Q1, I2, Q2) to signal processor 70；Described signal processor 70, for described I, Q signal Carry out processing generation target component and deliver to hind computation datatron 80, signal generator 40 is carried out simultaneously Sequencing contro；Described hind computation datatron 80, obtains target for described target component is carried out process Measurement result.Wherein I represents that in-phase component, Q represent quadrature component.

Owing to radar equipment is installed fixing, for obtaining high accuracy target bearing and range information, reception antenna Use dual channel receiver, use the first reception antenna and two reception antennas of the second reception antenna to connect the most simultaneously Receiving and receive signal, such two-way receives signal respectively after the first receiver and the second receiver demodulate, meeting An each road I, Q signal of producing is to signal processor；So energy when signal processor carries out signal processing Enough the most not fuzzy distance data that produce are used for calculating target range, and precision is higher, and angle on target is permissible Use double antenna phase contrast angle-measuring method, can accurately measure angle on target.This short range range radar system structure Simply, with low cost.

Preferably, in some preferred embodiment of this utility model short range range radar system, described One reception antenna, the second reception antenna and described transmitting antenna are provided separately.Launch antenna and reception antenna It is provided separately, i.e. uses the form of double antenna, the isolation of system sending and receiving passage can be increased, it is to avoid Interference.

Described transmitting antenna, the first reception antenna, the second reception antenna are the antenna part of described radar system Point, described first receiver, the second receiver and the radio frequency part that signal generator is described radar system, In actual applications, described radio frequency part can be positioned over the back of described antenna part, described radio-frequency part Divide and antenna part can also be integrated on one piece of circuit board.So arrange and can save more space, It is easy to miniaturization.

This utility model in actual applications, can be adopted with the following method for measuring target range and angle Degree:

Step A1: signal generator produces Multiple-Frequency Continuous Wave and launches signal, and described Multiple-Frequency Continuous Wave launches letter Number including the frequency hopping wave band continuing the first predetermined period, described frequency hopping wave band is by different continuous of multiple frequencies Wave component, in described frequency hopping wave band, the continuous wave of each frequency all continues the first Preset Time；Described multifrequency Continuous wave is launched signal and is launched by launching antenna；

Step A2: the first receiver and the docking collection of letters number of the second receiver are respectively processed and each produce One road I, Q signal to signal processor, signal processor is sampled the I of each frequency, Q signal, successively By FFT process, Threshold detection, target pairing, velocity calculated, distance resolves, angle resolves, instead Penetrate Strength co-mputation formation target component and deliver to background process computer；

Step A3: each target component of hind computation processor pair carries out false target rejecting, target initiates, Target following, target termination, target classification, object statistics, draw the distance of each target, speed And angle.

Wherein, described frequency hopping wave band can be made up of the continuous wave that 4 frequencies are different.Described first presets Time is 5.5us, and described first predetermined period is 2048 cycles.Refer to Fig. 2, frequency hopping wave band by 4 frequency (i.e. frequency f0, f1, f2 and f3) frequency hopping compositions, as it is shown on figure 3, each frequency Launch time is 5.5us, 4 one group of 22us, totally 2048 groups, about 45ms.

Measuring principle the following detailed description of target range, angle and speed.Assume frequency hopping wave band four Frequency is divided into f0=24.0810GHz, f1=24.0817GHz, f2=24.0827GHz, F3=24.0882GHz, described first Preset Time is 5.5us, and described first predetermined period is 2048 Cycle.

Four frequencies form three frequency differences, Δ f1=f1-f0=0.7MHz, Δ f2=f2-f0=1.7MHz, Δ F3=f3-f0=7.2MHz,

According to not fuzzy distance formula:

(2 Δ f), wherein R represents not fuzzy distance to R=c/, and c represents the light velocity.

So can draw three not fuzzy distance that is three frequency difference measurement distance be respectively R1=214.3m, R2=88.3m, R3=20.8m.I.e. three frequency differences same target can be produced three away from From, but the second frequency difference, the 3rd frequency difference that fuzzy distance is not little may obscure, and not fuzzy distance big One frequency difference is less due to radar transmission power, does not haves fuzzy, i.e. without departing from 214.3m. Namely the multiplying power of the first frequency difference is 0 forever, and i.e. first frequency distance the=the first frequency measures distance+0* R1.According to range measurement principle: the not fuzzy distance that frequency difference is little is big, but range accuracy is poor, the not mould that frequency difference is big Stick with paste apart from little, but range accuracy is high.So determining approximate distance by the first frequency difference, i.e. determine the second frequency difference Multiplying power；Recycle the second frequency difference and measure distance and corresponding multiplying power, improve range accuracy further, really The multiplying power of fixed 3rd frequency difference；Recycle the 3rd frequency difference and measure distance and corresponding multiplying power, determine final essence Really distance.

Owing to being double antenna, a frequency difference can produce two distances, the most all can produce 6 measurements Distance.Therefore double antenna arrange can produce more the most not fuzzy distance data for calculate target away from From, improve the certainty of measurement of distance.

If certain target measurement phase contrast resolves distance:

74.7397

77.6579

2.3416

1.8210

7.3488

7.6148

Front two distances being the first frequency difference double antenna and measuring, the 3rd, 4 is that the second frequency difference double antenna is surveyed The distance of amount, last two distances being the 3rd frequency difference double antenna and measuring.Being computed, final result is:

1.0000

4.0000

90.8151

The first row is the second frequency difference multiplying power, and the second row is the 3rd frequency difference multiplying power, and last column is final distance.

And for example:

Certain target measurement phase contrast resolves distance:

14.6057

206.2969

12.0614

6.4804

12.2761

11.9324

Being computed, final result is:

0.0000

0.0000

12.1042

The first row is the second frequency difference multiplying power, and the second row is the 3rd frequency difference multiplying power, and last column is final distance.

Described angle on target uses double antenna phase contrast angle-measuring method, refer to Fig. 4.

The space quadrature Φ of the signal that two bays receive is:

$\mathrm{\φ}=\frac{2\mathrm{\π}D\sin \mathrm{\θ}}{\mathrm{\λ}}---\left(1\right)$

Wherein θ is target incident angle, K0 and K1 is two antennas, and D is antenna distance.According to above Formula can try to achieve angle on target θ.

Because there being four frequencies to launch signal, double antenna is sought difference, can be had 4 differences.Actual test 4 Individual difference is respectively as follows:

-199.6397

-157.5984

-142.4100

-125.5804

According to real data rule, use medium filtering, i.e. sort by size, take intermediate value (odd number Data seek intermediate value, and middle two of even number numerical value is averaged).According to data stability, directly take Two, the most finally difference:

-125.5804

Further according to formula (1), angle on target θ can be tried to achieve.

Test the speed according to traditional continuous wave speed-measuring method:

Fd=2*v/ λ

Fd i.e. target Doppler frequency, v is target velocity, and λ is target wavelength, equal to c/f, i.e. light Speed is divided by frequency.

Fd=fs/2, i.e. target Doppler frequency are equal to the half of sample frequency, and counting due to objective accumulation is 2048, and target velocity has positive and negative point, so DOPPLER RESOLUTION is Fs/2/ (2048/2)=fs/2048.When target occurs in certain channel K, the fd=fs/2048*K. of target Further according to v=fd* λ/2, solving target speed.

In reality is measured, certain target channel is 94, then target velocity resolves and is: 52.0m/s.

In actual applications, signal processor can use one piece of circuit board, is responsible for the generation of full machine sequential. Its core is one piece of dsp chip, the embedded hardware timer of chip, and produces corresponding pulses at GPIO mouth, The sequential controlling radio circuit produces.These all depart from the control of DSP, independent operating.DSP embedded one Individual 12 AD, and Ke Cai 16 road signal.

Short range range radar system of the present utility model both may be used for target range range finding, test the speed it can also be used to Low-altitude target tracking, simultaneously can be used for traffic radar, can effectively carry out vehicle parking line detection, car The detection of queue length, running red light for vehicle detects.Follow the tracks of simultaneously and up to 64 targets of classifying (include Vehicle, bicycle, pedestrian), 4 track even more multilanes can be covered simultaneously, can survey farthest Amount is to 240 meters；Automatically the traffic direction of traffic flow is detected；It is used in intersection, vehicle can be detected Exist；The interval between the volume of vehicle, capacity, vehicle and the row of vehicle can be detected on every track Enter state etc..

Claims (2)

1. a short range range radar system, it is characterised in that described system includes for producing transmitting The signal generator of signal, the outfan of described signal generator is connected with launching antenna, described transmitting sky Line is used for launching described transmitting signal；Described system also includes the first reception sky for receiving signal Line and the second reception antenna, the outfan of described first reception antenna and the second reception antenna is respectively with first Receiver and the second receiver are connected, the outfan of described first receiver and the second receiver respectively with letter Number datatron is connected, and described signal processor includes that two outfans, one of them outfan are counted with backstage Calculation datatron is connected, and another outfan is connected with signal generator.

Short range range radar system the most according to claim 1, it is characterised in that described first Reception antenna, the second reception antenna and described transmitting antenna are provided separately.