關(guān)于汽車ADAS前裝77G毫米波雷達(dá)解決方案

開發(fā)77GHz毫米波雷達(dá)需要豐富的雷達(dá)系統(tǒng)和毫米波射頻設(shè)計(jì)經(jīng)驗(yàn)與能力。需要從系統(tǒng)、材料、軟硬件、結(jié)構(gòu)、測(cè)試驗(yàn)證、生產(chǎn)工藝、一致性等多方面考慮，而且，批量生產(chǎn)測(cè)試校準(zhǔn)是個(gè)復(fù)雜的系統(tǒng)工程。其在批量生產(chǎn)過程中都需要做校準(zhǔn)和一致性檢測(cè)。因此，開發(fā)77GHz毫米波雷達(dá)是一項(xiàng)非常艱巨的系統(tǒng)工程，需要更多的產(chǎn)業(yè)融合、技術(shù)和人才交流。

毫米波雷達(dá)應(yīng)用于ADAS中示意圖

77GHz 毫米波雷達(dá)優(yōu)勢(shì)：

1，超高頻率，提供更高精度能檢測(cè)到較小物體。

2，超寬帶寬，高分辨率能檢測(cè)到超短距離，抗干擾能力強(qiáng)。

3，天線和波長(zhǎng)成正比，體積尺寸重量小型化。

4, CMOS工藝，性價(jià)比高。

5, 全球授權(quán)頻段，5G通信實(shí)施無政策風(fēng)險(xiǎn)。

伴隨著C-NCAP的五星評(píng)定、交通部對(duì)營(yíng)運(yùn)車輛的JT/T-1094-2018標(biāo)準(zhǔn)的實(shí)施，國(guó)內(nèi)的毫米波雷達(dá)將進(jìn)入快速增長(zhǎng)的階段。對(duì)于市場(chǎng)的迫切需求，研發(fā)團(tuán)隊(duì)經(jīng)過多年在后向BSD、LCA前向FCW、ACC、AEB技術(shù)攻關(guān)，5次產(chǎn)品迭代，成功研發(fā)出77GHz毫米波雷達(dá)。在77GHz毫米波雷達(dá)公司BOSCH，CONTINENTAL，DELPHI中脫穎而出！

NXP Eagle單芯片雷達(dá)收發(fā)方案

Dolphin解決方案

關(guān)于77G毫米波雷達(dá)詳盡的技術(shù)問答

What's the advantages of 77GHz relative to 24GHz Radar?

ANSWER:There are differences in the physical wavelength of the carrier signal, and on regulatory points.At 77GHz the wavelength is three times smaller, so that the physical size of the antennas is a factor three smaller than at 24GHz, enabling further size reduction of the sensors. From regulation perspective, the allowed BW at 24GHz is a maximum of 200MHz, limiting the range resolution that can be obtained to about 0.75m, whereas at 77GHz up to 5GHz can be used (76 to 81GHz), allowing resolution up to 25times higher, which can be important for pedestrian detection (typical 1 to 2GHz BW) and parking applications (typically up to 4GHz measurement BW). So at 77GHz the radar is much smaller, while offering much higher measurement resolution.

2. What's the advantages of 77GHz relative to 24GHz Radar? As you know, SV have started the 24GHz Radar development. So, what's the primary difference between 24GHz Radar and 77GHz ?

ANSWER:In general, at 24 GHz the system is based on a single TX antenna and 2 RX antennas, and on an open loop modulation control of the VCO. This is a simple system but also the performance of the sensor is limited, as mentioned above to Q1. At 77 GHz it is feasible to use 3 TX and 4 RX antennas on a smaller size because the antennas are smaller. having an increased number of RX and TX ports available on an IC can be used to create multi-mode radars, increased angular resolution by MIMO, add elevation measurements capabilities, etc. With the development of integrated RF front-end and signal processing ICs at NXP, a 2-chip solution becomes feasible for 77GHz, which is the same configuration as for 24 GHz (2-chips).

3. What's the advantage of NXP compared with your competitors?

ANSWER:-Higher integration-Lower cost -Smaller footprint-Lower power consumption-System solution

4. Radar Roadmap of NXP

ANSWER: See preceding part

5. What SW tuning tools or simulation can NXP provide?

ANSWER: Need further discussion with Business Line.

6. Which kind of support can NXP AE provide to SV?

ANSWER: Need more time. We will have a plan in Q3 2016.

7. What's the general requirements on Bumper Material (frame, metallic paint, etc.) to minimize the impact to RF attenuation?

ANSWER: In general, the thickness of the bumper is important to avoid double reflections within the bumper itself. There are a number of articles on the scientific literature studying this effect, also for the composition of the paint. We have verified the performance of our front-end with a bumper in front, and it as not affected by bumper reflections.

8.What's the requirement for the PCB ? Can you share some experience with us?

ANSWER: We propose to use Rogers 3003, it is our reference. More details of our reference board can be shared later.

9. Can the through hole still be used as the feed point of 77G antenna? We see PCB Waveguide is used in some design.

ANSWER: No, through-hole can not be used. There are other possibilities for EM coupling from one side of the board to the other, or the RF chip can be mounted on the same side as the antenna.

10. What's the most popular frequency modulation in 77G band?

ANSWER: The most useful modulation technique for 77 GHz is the fast chirp sequence principle, because it allows direct range-velocity estimation of multiple targets, for example important for urban scenarios where may cars and pedestrians are moving simultaneously.