The in car 360 ° panoramic system needs to simultaneously process 4-6 high-definition video streams (up to 8K resolution) and achieve millisecond level synchronous transmission in complex electromagnetic environments, mechanical vibrations, and temperature changes. The insufficient bandwidth (below 1.5Gbps), signal attenuation, and weak anti-interference ability of traditional cables lead to problems such as image delay and splicing misalignment. The solution needs to focus on the following key technologies:
1、 High speed transmission and multi-channel synchronization technology
Ultra high speed transmission chip
Chip level optimization: Adopting THCV231/THVC236 series chips, supporting LVCMOS parallel signal to serial output, with a single channel bandwidth of up to 6Gbps, meeting the lossless transmission of 8K/60fps video streams.
Protocol compatibility: Integrated LVDS differential signaling technology, compatible with CAN FD, Ethernet (1000BASE-T1) and other protocols, supporting parallel transmission of multiple cameras.
Multi channel video synchronization
Nanosecond level clock synchronization: Unify the clock signals of each camera through a PLL phase-locked loop circuit, with a time deviation of ≤ 1 μ s, eliminating the feeling of image fragmentation.
Dynamic frame compensation algorithm: Intelligent detection of network jitter, adaptive adjustment of caching strategy, ensuring smooth image flow during high-speed driving.
2、 Anti interference and signal integrity guarantee
Electromagnetic shielding design
Triple shielding structure: silver plated braided layer+aluminum foil+common mode choke (CMC), electromagnetic interference suppression ratio>60dB, effectively resisting electromagnetic noise from motors and high-voltage battery packs.
Independent grounding circuit: Configure independent grounding for each video signal to avoid horizontal noise caused by crosstalk.
Signal compensation technology
HDR dynamic enhancement: embedded signal compensation chip, dynamically adjusts brightness and contrast, and can still restore clear details under complex lighting conditions.
3、 Vehicle grade durability and environmental adaptability
materials and processes
Ultra flexible and bending resistant cable: Made of high elasticity silicone outer cover, with a bending radius as low as 5mm, passed 200000 door opening and closing tests (ISO 20653 standard).
Waterproof and dustproof connector: IP69K level sealed interface, gold-plated contacts for oxidation resistance, working temperature range -40 ℃~125 ℃.
Seismic design
Spring locking structure: The connector adopts gold-plated contacts and spring locking, and the contact resistance fluctuation under vibration environment is ≤ 5m Ω to prevent poor contact.
4、 Protocol and Network Transmission Optimization
Standardized protocol support
ONVIF+RTSP： Realize device discovery and configuration through ONVIF protocol, establish real-time video streaming transmission through RTSP protocol, support H.264/H.265 encoding, and reduce bandwidth usage.
4G/5G network adaptation
Low latency transmission: 4G network optimized transmission protocol (such as RTP/UDP), latency<50ms; The 5G network supports a transmission rate of 10Gbps+with a latency of less than 1ms, meeting high real-time scenarios such as AR navigation.
5、 Typical application scenarios and value
Blind spot monitoring of logistics vehicles
Covering 360 ° field of view with 8 cameras, eliminating blind spots of mixer trucks and cold chain trucks, and combining with radar warning to achieve real-time obstacle warning.
Industrial vehicle safety
In the forklift collision avoidance system, multiple video splicing+millimeter wave radar fusion, AI algorithm real-time analysis of blind spot obstacles, triggering sound and light warnings.
Remote driving assistance
4G/5G network supports real-time viewing of panoramic images by remote terminals, combined with cloud management platform to achieve fleet scheduling and accident tracing.
Technical Comparison and Advantages
Indicator Traditional Scheme New Generation Scheme
Single channel bandwidth ≤ 1.5Gbps 6Gbps (supports 8K/60fps)
Synchronization accuracy>10ms ≤ 1 μ s (PLL phase-locked loop)
Anti interference capability 40dB (single-layer shielding)>60dB (triple shielding)
Working temperature -30 ℃~85 ℃ -40 ℃~125 ℃
Waterproof rating IP67 IP69K (anti high pressure water spray)
Implementation suggestions
Customized design: Choose FAKRA and HSD interface types according to vehicle requirements, supporting flexible configuration of cable length and protocol combinations.
Full chain testing: from EMC simulation to mass production vibration testing, ensuring compliance with automotive regulations such as AEC-Q200, ISO 16750, etc