CN110082768A - A kind of heat dissipating method and radar of the vehicle-mounted forward direction high-resolution radar of 77Ghz - Google Patents
A kind of heat dissipating method and radar of the vehicle-mounted forward direction high-resolution radar of 77Ghz Download PDFInfo
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- CN110082768A CN110082768A CN201910295130.5A CN201910295130A CN110082768A CN 110082768 A CN110082768 A CN 110082768A CN 201910295130 A CN201910295130 A CN 201910295130A CN 110082768 A CN110082768 A CN 110082768A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 210000004209 hair Anatomy 0.000 claims description 2
- 230000017525 heat dissipation Effects 0.000 abstract description 7
- 238000009434 installation Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
- G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/03—Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The present invention relates to a kind of heat dissipating methods of the vehicle-mounted forward direction high-resolution radar of 77Ghz, comprising: the working condition of each radio frequency chip of radar is determined according to the operating mode in radar frame period；The temperature data under each radio frequency chip current time working condition of radar is obtained, and temperature data is carried out two-by-two to seek difference operation；Difference is compared with the first preset threshold, when difference is less than or equal to the first preset threshold, it is remained unchanged in the working condition of each radio frequency chip of subsequent time, when difference is greater than the first preset threshold, the working condition of each radio frequency chip of subsequent time is adjusted according to its temperature data.The temperature data that the present invention passes through the radio frequency chip of acquisition radar, and processing operation is carried out to it to adjust the working condition of radio frequency chip, to adjust the temperature of the circuit board of installation radio frequency chip, keep the average power consumption of each radio frequency chip thereon approximately equal, so that heat dissipation for circuit board is uniform, the service life of radio frequency chip and circuit board is effectively improved.
Description
Technical field
The present invention relates to radar temperature control technology fields, more particularly to a kind of vehicle-mounted forward direction high-resolution radar of 77Ghz
Heat dissipating method and radar.
Background technique
In field of automobile safety, millimetre-wave radar is as one of main sensing technology of automatic Pilot, with what is held the balance
Effect.It is main in the functional applications such as FCW, ACC, AEB at present in the configuration of the whole body of automobile based on the scheme of multiple sensors
Using to Xiang Leida before 77G, traditional forward direction Radar Products are generally only to identify target in the horizontal plane, can not identify target height
Information is spent, therefore when identifying the targets such as tunnel, billboard, is easy to be reported by mistake obstacle information.Therefore there are horizontal dimensions
The high-resolution radar of target capability respectively is all had using more and more common with vertical dimensions.
Compared with traditional forward direction radar, high-resolution radar more a dimension, the antenna amounts used be will increase, because
This RF number of chips can also be multiplied.RF chip power consumption itself is excessively high, has 3 TX(transmitting antennas) and 4 RX(reception days
Line) RF chip maximum power dissipation generally can achieve 4W or more, then 4 RF chips (there are 12 TX and 16 RX), then plus
The heat dissipation of upper power supply chip and other IC, in the case where circuit board space is limited, whole plate power consumption and heat dissipation become very severe.
Currently, the method for whole plate heat dissipation generallys use the mode for increasing cooling fin or reducing duty ratio in Thirp structure,
However, increasing cooling fin will increase hardware cost, reduces duty ratio in Thirp structure and also reduced while reducing power consumption
The quantity of efficiently sampling in the same period, so that sampling precision reduces.
Summary of the invention
The present invention is to overcome the shortcomings of described in the above-mentioned prior art, provides a kind of vehicle-mounted forward direction high-resolution radar of 77Ghz
Heat dissipating method and radar.
In order to solve the above technical problems, technical scheme is as follows:
A kind of heat dissipating method of the vehicle-mounted forward direction high-resolution radar of 77Ghz, includes the following steps:
The working condition of each radio frequency chip of radar is determined according to the operating mode in radar frame period；
Obtain radar each radio frequency chip current time working condition under temperature data, and by the temperature data two-by-two into
Row seeks difference operation；
Each difference is compared with the first preset threshold respectively, when at least one difference is greater than the first preset threshold, under
The one moment working condition of each radio frequency chip is adjusted according to its temperature data, otherwise, in each institute of subsequent time
The working condition for stating radio frequency chip remains unchanged.
Further, as optimal technical scheme, the working condition of the radio frequency chip is adjusted and is specifically included:
When at least one difference is greater than the second preset threshold, in the work of corresponding two radio frequency chips of subsequent time
State is interchangeable, and otherwise, is replaced in turn in the working condition of each radio frequency chip of subsequent time.
Further, as optimal technical scheme, determine that the working condition of each radio frequency chip of radar specifically includes:
Radar is determined according to the total quantity of transmitting antenna required under the different working modes in radar frame period and receiving antenna
Each of the transmitting antenna of the radio frequency chip and the working condition of receiving antenna；
Each radio frequency chip according to the quantity of the transmitting antenna of its work and receiving antenna determine it locating for working condition.
Further, as optimal technical scheme, the operating mode includes in long away from horizontal emission and echo-signal mould
Formula, low coverage horizontal emission and echo-signal mode and low coverage Vertical Launch and echo-signal mode.
Further, as optimal technical scheme, the working condition includes high power consumption state, low power consumpting state and standby
State.
Further, as optimal technical scheme, first preset threshold and the second preset threshold are according to the radar
Specification, the temperature that the circuit board of service life or the installation radio frequency chip can bear is configured.
Further, as optimal technical scheme, the setting range of first preset threshold is less than 40 DEG C；Described
The setting range of two preset thresholds is 40 DEG C -60 DEG C.
Further, as optimal technical scheme, multiple radio frequency chips of the radar are cascaded, multiple cascaded RF chips
Between successively signal interconnect.
A kind of vehicle-mounted forward direction high-resolution radar of 77Ghz, using the heat dissipating method of the vehicle-mounted forward direction high-resolution radar of 77Ghz
It radiates.
Compared with prior art, the beneficial effect of technical solution of the present invention is:
The difference between temperature data that the present invention passes through the radio frequency chip for acquiring radar is compared with preset threshold, and according to
Comparison result is adjusted the working condition of radio frequency chip, to adjust the temperature of the circuit board of installation radio frequency chip, makes thereon
Each radio frequency chip average power consumption it is approximately equal so that heat dissipation for circuit board is uniform, effectively improve radio frequency chip and electricity
The service life of road plate.
Detailed description of the invention
Fig. 1 is the method for the present invention flow chart of steps.
Fig. 2 is radar frame structure of the present invention transmitting, echo signal diagram.
Fig. 3 is the circuit board schematic diagram of radio frequency chip of the present invention.
Fig. 4 is radio frequency chip different working modes schematic diagram of the present invention.
Fig. 5 is radio frequency chip periodicity rotation schematic diagram of the present invention.
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；In order to better illustrate this embodiment, attached
Scheme certain components to have omission, zoom in or out, does not represent the size of actual product；To those skilled in the art,
The omitting of some known structures and their instructions in the attached drawings are understandable；The same or similar label corresponds to same or similar
Component；The terms describing the positional relationship in the drawings are only for illustration, should not be understood as the limitation to this patent.
Specific embodiment
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawing, so that advantages and features of the invention are more
It is easily readily appreciated by one skilled in the art, to make apparent define to protection scope of the present invention.
Embodiment 1
A kind of heat dissipating method of the vehicle-mounted forward direction high-resolution radar of 77Ghz, includes the following steps: as shown in Figure 1:
S10. the working condition of each radio frequency chip of radar is determined according to the operating mode in radar frame period.
This step specifically includes:
Radar is determined according to the total quantity of transmitting antenna required under the different working modes in radar frame period and receiving antenna
Each of the transmitting antenna of the radio frequency chip and the working condition of receiving antenna.
Each radio frequency chip according to the quantity of the transmitting antenna of its work and receiving antenna determine it locating for working condition.
In this step, the operating mode in radar frame period includes in long away from horizontal emission and echo-signal mode, low coverage
Horizontal emission and echo-signal mode and low coverage Vertical Launch and echo-signal mode；The working condition of radio frequency chip includes height
Power consumption state, low power consumpting state and standby mode.
One frame period of radar is as shown in Figure 2: including the first subframe, close away from horizontal emission and echo-signal mode in length
The third subframe of the second subframe and low coverage Vertical Launch and echo-signal mode away from horizontal emission and echo-signal mode,
In, within a frame period, the first subframe occupied time cycle is T1, and transmitting and received echo-signal are m；Second son
The frame occupied time cycle is T2, and transmitting and received echo-signal are n；The third subframe occupied time cycle is T3,
Transmitting and received echo-signal are k, therefore, within a frame period, the radio frequency chip transmitting of radar and received echo letter
Number be T1*m+T2*n+T3*k.
In this example, it is assumed that the circuit design of the radio frequency chip of radar is as shown in figure 3, include 4 cascade radio frequencies
Chip, successively signal interconnects between 4 cascade radio frequency chips, including clock synchronization, inter-channel phase, amplitude synchronize, and
Each radio frequency chip is connect with DSP, while also being connect by sensor with DSP；And each radio frequency chip includes 3 transmitting days
Line TX and 4 receiving antenna RX.
And according to the sum of transmitting antenna TX and receiving antenna RX required under the different working modes in radar frame period
The working condition for determining the transmitting antenna TX and receiving antenna RX of each radio frequency chip RF of radar is measured, as indicated at 4:
Such as: when, away from horizontal emission and when echo-signal mode, needing 4 transmitting antennas altogether in the length that radar is in the frame period
Therefore TX and 9 receiving antenna RX is allocated 4 radio frequency chip RF, wherein 3 hairs in the first radio frequency chip RF1
It penetrates antenna TX and 4 receiving antenna RX is all working, 1 transmitting antenna TX and 4 reception days in the second radio frequency chip RF2
Line RX is working, and 1 receiving antenna RX in third radio frequency chip RF3 is working, and the 4th radio frequency chip RF4 does not work.
When radar is in the low coverage horizontal emission and echo-signal mode in frame period, 5 transmitting antenna TX are needed altogether
Therefore 4 radio frequency chip RF are allocated with 6 receiving antenna RX, wherein 3 transmittings in the first radio frequency chip RF1
Antenna TX and 4 receiving antenna RX are all working, 2 transmitting antenna TX and 2 receiving antennas in the second radio frequency chip RF2
RX is working, and third radio frequency chip RF3 and the 4th radio frequency chip RF4 do not work.
When radar is in the low coverage Vertical Launch and echo-signal mode in frame period, 8 transmitting antenna TX are needed altogether
Therefore 4 radio frequency chip RF are allocated with 13 receiving antenna RX, wherein 3 transmittings in the first radio frequency chip RF1
Antenna TX and 4 receiving antenna RX are all working, 3 transmitting antenna TX and 4 receiving antennas in the second radio frequency chip RF2
RX is working, and the 2 transmitting antenna TX and 4 receiving antenna RX in third radio frequency chip RF3 are working, the 4th radio frequency chip
1 receiving antenna RX in RF4 is working.
It can be seen from the above, within a frame period, in 4 radio frequency chip RF of radar, the first radio frequency chip RF1 and
Two radio frequency chip RF2 are in high power consumption state, and third radio frequency chip RF3 and the 4th radio frequency chip RF4 are constantly in low-power consumption
State or standby mode.
S20. the temperature data under each radio frequency chip current time working condition of radar is obtained, and by temperature data
It carries out seeking difference operation two-by-two.
It is connect by sensor with DSP since each radio frequency chip is connect with DSP, while also, therefore, DSP can pass through
Sensor obtains the temperature data under each radio frequency chip current time working condition, then carries out temperature data two-by-two to ask poor
Operation, to obtain its difference.
S30. each difference is compared respectively with the first preset threshold, is preset when at least one difference is greater than first
When threshold value, the working condition of each radio frequency chip of subsequent time is adjusted according to its temperature data, otherwise, every in subsequent time
The working condition of a radio frequency chip remains unchanged.
And the working condition of radio frequency chip is adjusted and is specifically included: when at least one difference is greater than the second preset threshold
When, it is interchangeable in the working condition of corresponding two radio frequency chips of subsequent time, otherwise, in each radio frequency core of subsequent time
The working condition of piece is replaced in turn.
For example, radar is in the length in frame period away from horizontal emission and echo-signal mode, as shown in figure 5, by the TI time
Period is divided into multiple periods, within first period, i.e. 0-Tset period, and 3 transmitting days of the first radio frequency chip RF1
Line TX and 4 receiving antenna RX are all working, and the 1 transmitting antenna TX and 4 receiving antenna RX of the second radio frequency chip RF2 exists
Work, 1 receiving antenna RX of third radio frequency chip RF3 are working, and the 4th radio frequency chip RF4 does not work, therefore, in 0-Tset
In period, the first radio frequency chip RF1 and the second radio frequency chip RF2 are now in high power consumption state, at third radio frequency chip RF3
It is in standby in low power consumpting state, the 4th radio frequency chip RF4；At this point, acquisition DSP acquires 4 radio frequency cores by sensor
The temperature data of piece, and temperature data is carried out two-by-two to seek difference operation, it is respectively that each difference is pre- with first to obtain its difference
If threshold value is compared, when at least one difference is greater than the first preset threshold, the work shape of each radio frequency chip of subsequent time
State is adjusted according to its temperature data, otherwise, is remained unchanged in the working condition of each radio frequency chip of subsequent time.
And the working condition of radio frequency chip is adjusted and is specifically included: when at least one difference is greater than the second preset threshold
When, it is interchangeable in the working condition of corresponding two radio frequency chips of subsequent time, otherwise, in each radio frequency core of subsequent time
The working condition of piece is replaced in turn, the mode replaced in turn such as Fig. 5, i.e., within the Tset-2Tset period, the second radio frequency core
Piece RF2 and third radio frequency chip RF3 is now in high power consumption state, the 4th radio frequency chip RF4 is in low power consumpting state, first penetrates
Frequency chip RF1 is in standby；Within the 2Tset-3Tset period, third radio frequency chip RF3 and the 4th radio frequency chip RF4
Be now in high power consumption state, the first radio frequency chip RF1 is in low power consumpting state, the second radio frequency chip RF2 is in standby,
And so on, so that the average power consumption of each radio frequency chip is approximately equal on board, so as to adjust the whole plate temperature of board, so that
Whole plate heat dissipation uniformly, extends the service life of radar.
More than, it is assumed that transmitting antenna TX or receiving antenna RX, all antennas without particular/special requirement are consistent.It is wanted if any special
It asks to fix and use, need to exclude outside the range that rotation uses, only by other antenna alternates.
In the present invention, the first preset threshold and the second preset threshold are penetrated according to the specification of the radar, service life or installation
The temperature that the circuit board of frequency chip can bear is configured, and in the present embodiment, the setting range of the first preset threshold is small
In 40 DEG C, it is preferred that the setting range of the first preset threshold is 20 DEG C -30 DEG C, and the setting range of the second preset threshold is 40
℃-60℃。
Embodiment 2
A kind of vehicle-mounted forward direction high-resolution radar of 77Ghz, using the vehicle-mounted forward direction high-resolution thunder of 77Ghz as described in Example 1
The heat dissipating method reached radiates
The radar includes being made of for the radio-frequency front-end of receiving and transmitting signal and the cascade of multiple radio frequency chips for doing data processing
With the DSP of operation, successively signal is interconnected between multiple cascade radio frequency chips, and each radio frequency chip is connect with DSP；And it is each
Radio frequency chip includes multiple transmitting antennas and multiple receiving antennas.
DSP is for obtaining the temperature data of radio frequency chip and according to the operating mode of temperature data and radar to its radio frequency core
The working condition of piece is allocated, to adjust the whole plate temperature of the board of installation radio frequency chip, so that each radio frequency core on board
The average power consumption of piece is approximately equal, and whole plate heat dissipation uniformly, extends the service life of radar.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (9)
1. a kind of heat dissipating method of the vehicle-mounted forward direction high-resolution radar of 77Ghz, which comprises the steps of:
The working condition of each radio frequency chip of radar is determined according to the operating mode in radar frame period；
Obtain radar each radio frequency chip current time working condition under temperature data, and by the temperature data two-by-two into
Row seeks difference operation；
Each difference is compared with the first preset threshold respectively, when at least one difference is greater than the first preset threshold, under
The one moment working condition of each radio frequency chip is adjusted according to its temperature data, otherwise, in each institute of subsequent time
The working condition for stating radio frequency chip remains unchanged.
2. the heat dissipating method of the vehicle-mounted forward direction high-resolution radar of 77Ghz according to claim 1, which is characterized in that institute
The working condition for stating radio frequency chip, which is adjusted, to be specifically included:
When at least one difference is greater than the second preset threshold, in the work of corresponding two radio frequency chips of subsequent time
State is interchangeable, and otherwise, is replaced in turn in the working condition of each radio frequency chip of subsequent time.
3. the heat dissipating method of the vehicle-mounted forward direction high-resolution radar of 77Ghz according to claim 1, which is characterized in that determine
The working condition of each radio frequency chip of radar specifically includes:
Radar is determined according to the total quantity of transmitting antenna required under the different working modes in radar frame period and receiving antenna
Each of the transmitting antenna of the radio frequency chip and the working condition of receiving antenna；
Each radio frequency chip according to the quantity of the transmitting antenna of its work and receiving antenna determine it locating for working condition.
4. the heat dissipating method of the vehicle-mounted forward direction high-resolution radar of 77Ghz according to claim 3, which is characterized in that described
Operating mode includes hanging down in long away from horizontal emission and echo-signal mode, low coverage horizontal emission and echo-signal mode and low coverage
Straight hair is penetrated and echo-signal mode.
5. the heat dissipating method of the vehicle-mounted forward direction high-resolution radar of 77Ghz according to claim 3, which is characterized in that described
Working condition includes high power consumption state, low power consumpting state and standby mode.
6. the heat dissipating method of the vehicle-mounted forward direction high-resolution radar of 77Ghz according to claim 2, which is characterized in that described
First preset threshold and the second preset threshold are according to the specification of the radar, service life or the circuit board institute for installing the radio frequency chip
The temperature that can be born is configured.
7. the heat dissipating method of the vehicle-mounted forward direction high-resolution radar of 77Ghz according to claim 2, which is characterized in that described
The setting range of first preset threshold is less than 40 DEG C；The setting range of second preset threshold is 40 DEG C -60 DEG C.
8. the heat dissipating method of the vehicle-mounted forward direction high-resolution radar of 77Ghz according to claim 1, which is characterized in that described
Multiple radio frequency chips of radar cascade, and successively signal interconnects between multiple cascaded RF chips.
9. a kind of vehicle-mounted forward direction high-resolution radar of 77Ghz, which is characterized in that using as described in any one of claim 1-8
The heat dissipating method of the vehicle-mounted forward direction high-resolution radar of 77Ghz radiate.
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Cited By (1)
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