CN206270489U - A kind of radar frequency synthesizer of range finding of testing the speed - Google Patents
A kind of radar frequency synthesizer of range finding of testing the speed Download PDFInfo
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- CN206270489U CN206270489U CN201621403184.7U CN201621403184U CN206270489U CN 206270489 U CN206270489 U CN 206270489U CN 201621403184 U CN201621403184 U CN 201621403184U CN 206270489 U CN206270489 U CN 206270489U
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- locking unit
- phase locking
- phase
- frequency synthesizer
- testing
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Abstract
The utility model discloses a kind of radar frequency synthesizer of range finding of testing the speed, including phase locking unit and power-supply system, the phase locking unit signal connects dsp chip, the dsp chip is used to configure the lock phase chip of phase locking unit, one input connection crystal resonator of the phase locking unit, another input of the phase locking unit connects voltage controlled oscillator by power splitter, and the output end linkloop wave filter of the phase locking unit, the loop filter connects voltage controlled oscillator.The utility model not only low production cost, function admirable, spaces compact, stability is high, and shared circuit area is small, dependable performance.
Description
Technical field
The utility model is related to radar frequency synthesizer field, more particularly to a kind of radar with the distance measurement function that tests the speed
Apparatus for frequency synthesizing.
Background technology
As highway communication is fast-developing, the safety problem on highway becomes abnormal severe, drives over the speed limit, road accident rate
Higher is to cause the main cause of traffic accident.In order to reduce the traffic accident and violation phenomenon that cause due to driving over the speed limit, lead to
Cross using radar to detect road speed and distance, the range radar that tests the speed is to utilize to modulate continuous wave（FMCW）.Radar is not using
Only make the measurement and accurate positioning of speed, also allow for police's law enforcement monitoring, detect the hypervelocity behavior of simultaneously registration of vehicle, pass through
Severe punitive measures effectively checks the traffic accident produced due to hypervelocity.
The output result of the frequency synthesis of radar can directly influence the precision of measuring speed and distance.However, traditional
Frequency synthesizer price is higher, and circuit is complicated, is difficult to meet the design requirement of user in the application scenario of some narrow spaces.
On the other hand, using by triangle wave voltage signal modulation voltage controlled oscillator carry out produce modulation continuous wave surveyed
Speed and range finding, although realizing that the circuit design of frequency synthesis is simple, the core parts varactor of voltage controlled oscillator
Inherent characteristic, output frequency and VT are not linear relationships, so have very big shadow to finding range and range accuracy
Ring.
Existing velocity radar frequency synthesizer uses single-frequency continuous wave, can measure target velocity, but can not find range.In reality
In use, radar is not good enough to the uniformity of cart and dolly triggering positioning, and camera occurs suddenly preceding neglecting when capturing on border
Phenomenon afterwards, causes part picture normally to use.According to digital frequency synthesis technology, the design cycle is more long, and circuit is multiple
Miscellaneous, required chip is more, high cost, is unfavorable for extensive use, and such production cost can increase..
Utility model content
The purpose of this utility model be solve the deficiencies in the prior art, there is provided a kind of band test the speed distance measurement function, low cost and
And the radar frequency synthesis system that can be used under the conditions of atrocious weather.
The technical solution adopted in the utility model is：A kind of radar frequency synthesizer of range finding of testing the speed, including phase locking unit
And power-supply system, the phase locking unit signal connection dsp chip, the dsp chip is used to configure the lock phase chip of phase locking unit, described
One input connection crystal resonator of phase locking unit, another input of the phase locking unit connects voltage-controlled shaking by power splitter
Device is swung, the output end linkloop wave filter of the phase locking unit, the loop filter connects voltage controlled oscillator.
Used as further improvement of the utility model, the loop filter is passive third-order filter, described passive three
Rank wave filter includes three electric capacity of two resistance of series connection and parallel connection.
Further improved as of the present utility model, the power splitter is designed using micro-strip.
The utility model use beneficial effect be：The frequency synthesizer of this structure produces CW with frequency modulation to carry out to speed
The measurement of degree and distance, meets the demand of traffic system.The utility model not only low production cost, function admirable, spaces compact,
Stability is high, and shared circuit area is small, dependable performance.
Brief description of the drawings
Fig. 1 is the utility model functional-block diagram.
Fig. 2 is passive loop filter functional-block diagram of the present utility model.
Shown in figure：1 phase locking unit, 2 power-supply systems, 3 crystal resonators, 4 dsp chips, 5 loop filters, 6 pressures
Controlled oscillator, 7 power splitters.
Specific embodiment
With reference to Fig. 1 and Fig. 2, the utility model is described further.
As illustrated, a kind of radar frequency synthesizer of range finding of testing the speed, including phase locking unit and power-supply system, the lock phase
Device signal connects dsp chip, and the dsp chip is used to configure the lock phase chip of phase locking unit, an input of the phase locking unit
Connection crystal resonator, another input of the phase locking unit connects voltage controlled oscillator by power splitter, the phase locking unit
Output end linkloop wave filter, the loop filter connects voltage controlled oscillator.
Phase locking unit is based on its internal phase discriminator, compares the phase and voltage controlled oscillator of the input signal of crystal oscillator
The phase of output signal, and export as the phase error electric current of comparative result.The phase error electric current is by loop filter
After being filtered, generate control voltage to control the output of voltage controlled oscillator, control phase locking unit to carry out by three-wire type serial ports
CW with frequency modulation, the frequency synthesis of generation carries out the measurement of speed and distance.Phase error electric current is carried out by loop filter
Filtering control voltage controlled oscillator later, so as to change the frequency of oscillator, the frequency of oscillator output by after power splitter again
Phase locking unit is fed back to, a phase feedback system is thus constituted, so as to reduce the phase error of input signal and oscillator.
The lock phase chip of phase locking unit uses the ADF4159 chips of ADI companies.Integrated chip low noise digital frequency discrimination mirror
Phase, accurate charge pump, programmable reference frequency divider, produce with modulation and quickly continuous triangle slope function, there is provided
Frequency synthesizer with ranging and range rate.Voltage controlled oscillator ensures the requirement of the frequency of phaselocked loop output, to producing frequency to need
Stability is good, and phase noise is low, and temperature stability Reliability comparotive is high.DSP（Digital Signal Processing）It is lock phase that chip is mainly
Chip carries out configuration data device, and system output CW with frequency modulation is controlled, and crystal resonator provides reference for phase locking unit
Signal.
Further to improve effect of the present utility model, there is provided the signal of stabilization output, the loop filter is passive
Third-order filter, the passive third-order filter includes three electric capacity of two resistance of series connection and parallel connection.Three rank passive rings
Wave filter is a kind of linear low-pass filters, so that closed loop circuit stabilization improves the phase noise and tracking characteristics of circuit, is used
High fdrequency component in the phase error electric current for filtering phase locking unit output, to reach smothing filtering and finally make loop reach stabilization
Effect.
Power splitter is designed using micro-strip, so as to enormously simplify circuit, saves design cost and circuit space, relative to
Other speed-measuring radar systems, with more low cost, dynamical feature.
The utility model has the advantage of：
1) microstrip IC integrated technology, to the rational deployment of circuit, each chip integration considers, reduces electromagnetism and does
Disturb, reduce the average price of system, enhance stability, reliability.
2) control interface is more convenient flexibly, and the synchronous communication port of three-wire type serial ports, circuit is simple, low cost.
3) phase-locked loop of mixed decimal frequency dividing and phase demodulation spurious reduction, the phase-locked loop produces the frequency for being up to 13GHz
Composite signal, makes full use of the narrow-band filtering characteristic of phaselocked loop, the outer spurious reduction degree of elevator belt, and then reduces spuious level,
It is adapted to frequency modulation continuous wave slope function.
4) electronic component in passive loop filter, voltage controlled oscillator, phase locking unit uses the less unit of packing forms
Part, power splitter is designed using micro-strip, therefore the entirely convenient manufacturing process of frequency synthesizer system, with low cost and circuit performance
It is reliable and stable.
Those skilled in the art may be used also it is to be understood that protection scheme of the present utility model is not limited only to the above embodiments
To carry out various permutation and combination and conversion on the basis of above-described embodiment, on the premise of without prejudice to the utility model spirit,
The various conversion that the utility model is carried out are all fallen within protection domain of the present utility model.
Claims (3)
1. a kind of radar frequency synthesizer of range finding of testing the speed, it is characterized in that including phase locking unit（1）And power-supply system（2）, it is described
Phase locking unit（1）Signal connects dsp chip（4）, the dsp chip is by three-wire type serial ports connection phase locking unit, the dsp chip
（4）Lock phase chip for configuring phase locking unit, the phase locking unit（1）An input connection crystal resonator（3）, the lock
Another input of phase device passes through power splitter（7）Connection voltage controlled oscillator（6）, the phase locking unit（1）Output end connection ring
Path filter（5）, the loop filter（5）Connection voltage controlled oscillator（6）.
2. the radar frequency synthesizer of a kind of range finding of testing the speed according to claim 1, it is characterized in that the loop filtering
Device is passive third-order filter, and the passive third-order filter includes three electric capacity of two resistance of series connection and parallel connection.
3. the radar frequency synthesizer of a kind of range finding of testing the speed according to any one in claim 1 or 2, it is characterized in that
The power splitter is designed using micro-strip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621403184.7U CN206270489U (en) | 2016-12-21 | 2016-12-21 | A kind of radar frequency synthesizer of range finding of testing the speed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621403184.7U CN206270489U (en) | 2016-12-21 | 2016-12-21 | A kind of radar frequency synthesizer of range finding of testing the speed |
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| Publication Number | Publication Date |
|---|---|
| CN206270489U true CN206270489U (en) | 2017-06-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621403184.7U Active CN206270489U (en) | 2016-12-21 | 2016-12-21 | A kind of radar frequency synthesizer of range finding of testing the speed |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109901170A (en) * | 2019-03-21 | 2019-06-18 | 西安交通大学 | A kind of intelligent transportation detection system and method based on radar block array |
-
2016
- 2016-12-21 CN CN201621403184.7U patent/CN206270489U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109901170A (en) * | 2019-03-21 | 2019-06-18 | 西安交通大学 | A kind of intelligent transportation detection system and method based on radar block array |
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