Stalker Sport 2 手持式专业测速雷达——Ka波段晶体偏振·±0.1mph超高精度·0.01秒瞬时捕获·100Hz刷新率·便携式运动目标速度采集与案件重建分析系统（刑事技术交通事故调查/涉车犯罪现场勘查/特警战术行动核心测速装备）

 

Stalker Sport 2 手持式专业测速雷达——Ka波段晶体偏振·±0.1mph超高精度·0.01秒瞬时捕获·100Hz刷新率·便携式运动目标速度采集与案件重建分析系统（刑事技术交通事故调查/涉车犯罪现场勘查/特警战术行动核心测速装备）

〖重要合规前置声明〗 本产品为国家管制类刑事技术侦查取证与特种战术专用装备，仅面向具备法定执法权限的各级公安机关刑事技术部门、交通管理部门、特警反恐部门、人民检察院、人民法院、司法鉴定机构及授权执法与应急响应单位定向研发、生产与供应，严禁向任何个人、无资质企业及非授权单位销售或提供。本设备的购置、配备、使用与管理，必须严格遵守《中华人民共和国道路交通安全法》《中华人民共和国刑事诉讼法》《公安机关办理刑事案件程序规定》及国家关于警用装备管理、无线电频率使用的相关法律法规与行业技术标准，必须由经过专业培训、取得相应刑事技术或交通执法岗位资质的人员规范操作，严禁无资质单位和个人违规购置、使用、转让本装备，严禁将测速数据直接作为司法鉴定意见而不经法定程序确认，严禁将本设备用于法定执法勤务之外的任何用途。

产品概述

Stalker Sport 2 手持式专业测速雷达——Ka波段晶体偏振·±0.1mph超高精度·0.01秒瞬时捕获·100Hz刷新率·便携式运动目标速度采集与案件重建分析系统（亦称Stalker Sport 2测速雷达、手持式专业测速雷达）是一款依托Stalker品牌领先的微波技术与高速数字信号处理（DSP）系统打造的高性能手持测速装备，属于公安刑事技术交通事故调查、涉车犯罪现场勘查、特警战术行动及司法鉴定车速鉴定领域的核心精密测速设备。该产品由北京毕思特联合科技有限公司引进，专为刑事犯罪现场勘查、交通事故深度调查、特警战术行动及特种勤务中对运动目标速度进行超高速、高精度测量的严苛需求深度定制，完美适配重大交通事故现场的车速模拟测量与科学重建、涉车刑事案件中嫌疑车辆行驶速度的关键证据固定、特警车辆拦截与护卫行动中的目标速度即时情报获取、复杂现场抛射物速度分析及警用驾驶训练的高精度量化考核等多种专业执法与司法场景。

系统以±0.1英里/小时的极高精度、0.01秒的瞬时目标捕获能力、最高100次/秒的数据刷新率以及Ka波段晶体偏振微波技术为核心，确保在最复杂的多目标环境中也能准确锁定并测量指定目标的真实速度。整机采用高强度聚碳酸酯塑料外壳，重量仅约794克，由标准AA电池供电，工作温度范围覆盖-28°C至+48°C，从根本上解决了传统测速设备精度不足难以支撑司法鉴定、多目标环境下易受干扰导致数据失真、以及恶劣气候条件下无法稳定工作等实战痛点，能够为刑事技术人员、交通调查官及特警指挥员提供“实验室级测量精度、毫秒级瞬时响应、复杂环境精准锁定、全地域全天候可靠运行” 的专业级运动目标速度采集与分析能力，是将速度这一关键动态参数转化为可靠法庭科学证据的重要核心刑事技术装备。

技术原理

该测速雷达基于多普勒效应与高速数字信号处理原理协同工作。在微波发射与接收层面，设备内置的Ka波段（34.7 GHz）微波发射源通过天线向目标方向发射一束频率高度稳定的连续波微波信号。当微波信号遇到运动目标（如行驶中的车辆）时，目标反射回来的信号频率因多普勒效应而发生偏移——目标朝向雷达运动时反射信号频率升高，背离时频率降低，频率偏移量（即多普勒频移）与目标的径向运动速度严格成正比。设备接收天线捕获反射信号后，将其与发射信号的基准频率进行混频处理，提取出差频信号——即多普勒频移信号。

在数字信号处理层面，内置的高速DSP处理器以极高的采样率对多普勒频移信号进行实时频谱分析，通过快速傅里叶变换（FFT）算法将时域信号转换为频域信号，精确测定频移量并换算为目标的瞬时速度。系统采用晶体偏振技术，在微波发射与接收链路中引入偏振滤波机制，有效抑制雨雪、扬尘、路面杂波及非目标车辆的干扰反射信号，确保在多车流或复杂反射环境中精准锁定并持续跟踪单一指定目标的运动速度。整机输出功率仅5毫瓦，属超低功率安全辐射范畴，对人体无任何健康影响。

在数据输出层面，系统提供两种显示精度模式：整数显示模式下目标速度获取时间仅0.01秒，数据刷新率高达100次/秒，适用于需要捕捉瞬时速度峰值的战术场景；带一位小数显示模式下获取时间约0.04秒，刷新率30次/秒，适用于需要更高读数分辨率的司法鉴定场景。测速范围覆盖8至240千米/小时，探测距离对标准车辆目标可达约1.6公里，对棒球等小型目标约300米。所有测量数据实时显示于背光液晶显示屏上，便于在各种光线条件下清晰判读。

核心功能与合规实战价值

±0.1英里/小时超高精度与0.01秒瞬时捕获，为司法鉴定车速重建提供实验室级科学数据支撑
设备测速精度高达±0.1英里/小时，目标速度获取时间仅0.01秒，代表了手持雷达测速技术的顶尖水平。在重大交通事故的司法鉴定中，鉴定人使用本设备在事故现场相同道路条件下进行车速模拟测量，所获速度数据的精度与瞬时响应能力完全满足车速鉴定技术规范对测量方法科学性与数据准确性的严格要求。该实验室级测速性能使速度这一原本难以精确量化的动态参数，转化为经得起法庭质证的科学证据——鉴定人可依据实测数据准确推算事故车辆的行驶速度、制动距离及碰撞能量，为事故责任认定与案件重建提供客观的数据基础，其数据严谨性足以支撑司法鉴定结论。

Ka波段晶体偏振与DSP智能抗干扰，确保复杂多目标环境下单一指定目标的精准锁定
设备工作频率为34.7 GHz Ka波段，采用晶体偏振技术结合高速DSP数字信号处理，在多车流道路、城市复杂反射环境或特警战术拦截现场等多目标并存的场景中，能够有效过滤环境杂波与非目标车辆的干扰反射信号，精准锁定并持续跟踪单一指定目标的运动速度，确保测量结果不受周边其他运动物体的影响。该精准单目标锁定能力在涉车刑事案件中——如危险驾驶、驾车冲撞等——为执法人员固定嫌疑车辆的特定行驶速度提供了不可辩驳的单目标客观数据，避免了因多目标信号混叠导致的测速误差或证据异议。

100次/秒高刷新率与1.6公里远距离探测，支撑战术速度监测与远距离目标预警
设备在整数显示模式下数据刷新率高达100次/秒，可实时捕捉目标的瞬时速度变化——在特警执行车辆拦截或要人车队护卫行动中，指挥员可依据目标车辆的实时速度曲线判断其加速或减速意图，为拦截时机选择与风险评估提供精确的动态情报。探测距离对标准车辆目标可达约1.6公里，为远距离速度监测与提前预警提供了充裕的战术响应时间。

-28°C至48°C宽温域与AA电池供电，保障从严寒到酷暑的全地域全天候勤务连续运行
设备工作温度范围覆盖-28°C至+48°C，存储温度范围-40°C至+60°C，采用标准AA电池供电，在极寒北方的冬季户外交通事故现场或酷暑南方的长时间设卡测速勤务中均可稳定可靠工作。整机外壳为高强度聚碳酸酯塑料，坚固耐用，重量仅约794克，手持式设计便于在各类现场快速部署与操作。

合规应用场景

重大交通事故深度调查与车速司法鉴定场景
在重大、疑难或致死交通事故的司法鉴定中，鉴定人携带本测速雷达至事故现场，在相同道路条件与环境下进行车速模拟测量，精确获取特定行驶状态下的车辆速度数据。结合事故现场勘查所获的制动痕迹长度、碰撞点位置及车辆损坏程度，鉴定人依据实测速度数据与经典物理模型推算事故车辆的行驶速度、制动初速度及碰撞能量，为事故过程重建、责任认定及车速鉴定报告出具提供关键的科学数据支撑。测量数据经法定程序确认后可直接作为鉴定意见的核心技术依据。

涉车刑事案件中嫌疑车辆速度的关键证据固定场景
在侦办危险驾驶、驾车冲撞、以危险方法危害公共安全等涉车刑事案件中，执法人员使用本测速雷达对嫌疑车辆的行驶速度进行精确测量与实时记录。在高速公路追逐、城市道路拦截或公共场所冲撞案件的现场处置中，设备0.01秒的瞬时捕获能力与±0.1英里/小时的超高精度可精准记录嫌疑车辆的实时速度，该数据作为证明嫌疑人主观故意与行为危险性的核心客观证据，经法定程序确认后可直接用于法庭举证。

特警战术行动中的目标速度即时情报获取场景
在特警执行车辆拦截、要人车队护卫或处置驾车冲卡事件时，特警侦察员使用本测速雷达在安全距离外对目标车辆的速度进行实时监测。设备100次/秒的高刷新率可即时反映目标的加速或减速意图，指挥员根据实时速度数据判断威胁等级、预判行驶轨迹、选择最佳拦截时机并评估拦截风险，为战术决策提供精确的动态情报支撑。

警用驾驶训练与装备效能评估的量化考核场景
在警用特种驾驶训练中，教官使用本测速雷达对训练车辆在高速避险、紧急制动、精准拦截等科目中的瞬时速度与速度变化曲线进行高精度量化记录，为驾驶训练效果评估提供客观的数据依据。在新警用车辆或无人机列装前的性能测试中，测试人员可使用本设备对装备的速度性能进行精确测量与验证。

核心技术参数

核心测速性能方面，测速范围覆盖8至240千米/小时，测速精度±0.1英里/小时，目标速度获取时间0.01秒（整数显示）或0.04秒（带一位小数显示），数据刷新率100次/秒（整数）或30次/秒（带一位小数）。探测能力方面，对标准车辆目标探测距离最大约1.6公里，对棒球等小目标约300米。微波系统方面，工作频率34.7 GHz（Ka波段），采用晶体偏振技术增强目标识别与抗干扰能力，输出功率5毫瓦。显示与操作方面，配备背光液晶显示屏。电源方面，由标准AA电池供电。环境适应性方面，工作温度范围-28°C至+48°C，存储温度范围-40°C至+60°C。物理规格方面，外壳为高强度聚碳酸酯塑料，尺寸约20cm×8cm×17cm，重量含电池约794克。

合规实战应用案例

某省司法鉴定中心受理一起高速公路多车连环追尾致死案件的鉴定委托，争议焦点为首车是否因超速行驶导致制动不及。鉴定人携带本Stalker Sport 2手持式专业测速雷达至事故路段，在相同道路坡度、路面状况及天气条件下，使用与事故车辆同型号的测试车辆进行车速模拟测量。设备在整数显示模式下以0.01秒的瞬时响应与±0.1英里/小时的超高精度，精确记录了测试车辆在不同初始速度下的制动距离数据。鉴定人结合事故现场遗留的制动痕迹长度，依据实测速度-制动距离关系曲线推算事故车辆在制动前的行驶速度，出具了车速鉴定报告。在法庭质证中，鉴定人向法庭说明了测速雷达的测量原理、精度指标及模拟实验过程，法庭采信了鉴定结论并据此划分了事故责任。

某市公安机关在侦办一起以危险方法危害公共安全案件时，嫌疑人在城市主干道上驾车超速行驶并冲撞多个路边摊位。执法人员在后续侦查中，使用本测速雷达在案发路段对同型号嫌疑车辆进行速度模拟测量，精确获取了车辆在相同行驶路径上的速度数据。结合案发现场监控视频的时间戳分析，侦查人员准确推算了嫌疑车辆在冲撞瞬间的行驶速度，该速度数据作为证明嫌疑人主观故意与行为危险性的关键客观证据随案卷移送检察机关审查起诉。在法庭审理中，辩护方对车速认定方法提出质疑，鉴定人当庭说明了Stalker雷达的技术原理与测量精度，法庭认定该测速数据具有科学可靠性与证据效力，依法予以采信。

厂家信息：北京毕思特联合科技有限公司
网址：https://www.bestlh.com
地址：北京市亦庄开发区经海六路一号院尖子班 C9 独栋
电话：010-56526048

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Stalker Sport 2 Handheld Professional Speed Radar — Ka-Band Crystal Polarization · ±0.1mph Ultra-High Accuracy · 0.01-Second Instantaneous Acquisition · 100Hz Refresh Rate · Portable Moving Target Speed Acquisition & Case Reconstruction Analysis System (Core Speed Measurement Equipment for Criminal Technical Traffic Accident Investigation / Vehicle-Related Crime Scene Investigation / Special Police Tactical Operations)

Global site URL：https://xilankeji.en.alibaba.com

〖Important Compliance Precaution〗 This product is a state-controlled specialized equipment for criminal technical investigation and special tactical operations, which is solely developed, produced and supplied to authorized law enforcement agencies such as criminal technical departments and traffic management departments of public security organs, special police counter-terrorism units, people's procuratorates, people's courts, forensic identification institutions, and authorized enforcement and emergency response units with statutory law enforcement authority. Any sale or supply to individuals, non-qualified enterprises and unauthorized units is strictly prohibited. The procurement, deployment, use and management of this equipment must strictly comply with the Road Traffic Safety Law of the People's Republic of China, the Criminal Procedure Law of the People's Republic of China, the Provisions on the Procedures for Handling Criminal Cases by Public Security Organs, and national laws, regulations and industrial technical standards regarding police equipment management and radio frequency usage. Operation must be carried out exclusively by professionally trained personnel holding corresponding criminal technical or traffic law enforcement post qualifications. Unauthorized units and individuals are strictly forbidden from purchasing, using or transferring this equipment. Directly using speed measurement data as a judicial forensic expert opinion without confirmation through statutory procedures, or using this equipment for any purpose other than statutory law enforcement duties, is strictly prohibited.

Product Overview

The Stalker Sport 2 Handheld Professional Speed Radar — Ka-Band Crystal Polarization, ±0.1mph Ultra-High Accuracy, 0.01-Second Instantaneous Acquisition, 100Hz Refresh Rate, Portable Moving Target Speed Acquisition & Case Reconstruction Analysis System (also referred to as the Stalker Sport 2 Speed Radar or Handheld Professional Speed Radar) is a high-performance handheld speed measurement device built upon Stalker's industry-leading microwave technology and high-speed Digital Signal Processing (DSP) system. It constitutes a core precision speed measurement device in the fields of criminal technical traffic accident investigation, vehicle-related crime scene investigation, special police tactical operations, and judicial forensic vehicle speed identification. This product is introduced by Beijing Best United Technology Co., Ltd. and is deeply customized for the rigorous demands of ultra-high-speed, high-precision measurement of moving target speeds during criminal crime scene investigations, in-depth traffic accident investigations, special police tactical operations, and specialized duties. It perfectly adapts to various professional law enforcement and judicial scenarios, including vehicle speed simulation measurement and scientific reconstruction at major traffic accident scenes, the critical evidence preservation of suspect vehicle speeds in vehicle-related criminal cases, the instant intelligence acquisition of target speeds during special police vehicle interdiction and escort operations, the velocity analysis of projectiles at complex scenes, and high-precision quantitative assessment of police driving training.

The system features an extremely high accuracy of ±0.1 mph, an instantaneous target acquisition capability of 0.01 seconds, a data refresh rate of up to 100 times per second, and Ka-band crystal polarization microwave technology at its core. This ensures accurate lock-on and measurement of the true speed of a designated target even in the most complex multi-target environments. The entire unit features a high-strength polycarbonate plastic housing, weighs only approximately 794 grams, is powered by standard AA batteries, and has an operating temperature range covering -28°C to +48°C. This fundamentally resolves the operational pain points of traditional speed measurement devices, such as insufficient accuracy to support judicial forensic identification, susceptibility to interference in multi-target environments leading to data distortion, and the inability to function stably under adverse weather conditions. It provides criminal technical personnel, traffic investigators, and special police commanders with "laboratory-grade measurement accuracy, millisecond-level instantaneous response, precise lock-on in complex environments, and reliable operation across all regions and all weather conditions" professional-grade moving target speed acquisition and analysis capability. It is a critical core piece of criminal technical equipment for transforming the key dynamic parameter of speed into reliable forensic scientific evidence.

Technical Principle

This speed radar operates on the synergistic principles of the Doppler effect and high-speed digital signal processing. At the microwave transmission and reception level, the device's built-in Ka-band (34.7 GHz) microwave emission source transmits a beam of continuous wave microwave signals with highly stable frequency towards the target direction via an antenna. When the microwave signal encounters a moving target (such as a traveling vehicle), the frequency of the signal reflected by the target shifts due to the Doppler effect—the reflected signal frequency increases when the target moves towards the radar and decreases when it moves away. The frequency offset (i.e., the Doppler shift) is strictly proportional to the radial velocity of the target. After the device's receiving antenna captures the reflected signal, it mixes it with the reference frequency of the transmitted signal to extract the difference frequency signal—the Doppler shift signal.

At the digital signal processing level, the built-in high-speed DSP processor performs real-time spectrum analysis on the Doppler shift signal at an extremely high sampling rate. Through a Fast Fourier Transform (FFT) algorithm, the time-domain signal is converted into a frequency-domain signal, precisely determining the frequency shift and converting it into the target's instantaneous speed. The system employs crystal polarization technology, introducing a polarization filtering mechanism in the microwave transmission and reception links. This effectively suppresses interfering reflected signals from rain, snow, dust, road clutter, and non-target vehicles, ensuring precise lock-on and continuous tracking of the speed of a single designated target even in multi-vehicle traffic or complex reflective environments. The entire unit has an output power of only 5 milliwatts, falling within the ultra-low power safe radiation range, and poses no health risks to the human body.

At the data output level, the system provides two display precision modes: in integer display mode, the target speed acquisition time is only 0.01 seconds, with a data refresh rate as high as 100 times per second, suitable for tactical scenarios requiring the capture of instantaneous speed peaks. In one-decimal-place display mode, the acquisition time is approximately 0.04 seconds, with a refresh rate of 30 times per second, suitable for judicial forensic identification scenarios requiring higher readout resolution. The speed measurement range covers 8 to 240 km/h. The detection range can reach approximately 1.6 km for standard vehicle targets and approximately 300 meters for small targets such as baseballs. All measurement data is displayed in real time on a backlit LCD screen, facilitating clear interpretation under various lighting conditions.

Core Functions and Compliance Operational Value

±0.1 mph Ultra-High Accuracy and 0.01-Second Instantaneous Acquisition, Providing Laboratory-Grade Scientific Data Support for Judicial Forensic Vehicle Speed Reconstruction
The device features a speed measurement accuracy of up to ±0.1 mph and a target speed acquisition time of only 0.01 seconds, representing the pinnacle of handheld radar speed measurement technology. In the judicial forensic identification of major traffic accidents, the forensic examiner uses this device to conduct vehicle speed simulation measurements under the same road conditions at the accident scene. The accuracy and instantaneous response capability of the acquired speed data fully meet the stringent requirements for the scientific validity of measurement methods and data accuracy stipulated in vehicle speed identification technical standards. This laboratory-grade speed measurement performance transforms speed—a dynamic parameter originally difficult to precisely quantify—into scientific evidence that can withstand court cross-examination. Based on the measured data, the forensic examiner can accurately calculate the vehicle's traveling speed, braking distance, and collision energy, providing an objective data foundation for accident liability determination and case reconstruction. The rigor of this data is sufficient to support a judicial forensic expert conclusion.

Ka-Band Crystal Polarization and DSP Intelligent Anti-Interference, Ensuring Precise Lock-On of a Single Designated Target in Complex Multi-Target Environments
The device operates at a frequency of 34.7 GHz Ka-band, employing crystal polarization technology combined with high-speed DSP digital signal processing. In scenarios where multiple targets coexist, such as multi-lane roads, complex urban reflective environments, or special police tactical interdiction scenes, it can effectively filter out environmental clutter and interfering reflected signals from non-target vehicles. It precisely locks onto and continuously tracks the speed of a single designated target, ensuring that the measurement result is not affected by other moving objects in the vicinity. In vehicle-related criminal cases—such as dangerous driving and vehicle ramming—this precise single-target lock-on capability provides law enforcement officers with indisputable, objective single-target data for recording the specific speed of a suspect vehicle, avoiding measurement errors or evidentiary disputes caused by the aliasing of multi-target signals.

100Hz High Refresh Rate and 1.6km Long-Range Detection, Supporting Tactical Speed Monitoring and Long-Range Target Early Warning
The device features a data refresh rate of up to 100 times per second in integer display mode, allowing it to capture instantaneous changes in a target's speed in real time. During special police vehicle interdiction or VIP motorcade escort operations, the commander can determine the target vehicle's acceleration or deceleration intentions based on its real-time speed curve, providing precise dynamic intelligence for selecting the timing of interdiction and assessing risks. The detection range for standard vehicle targets can reach approximately 1.6 km, providing ample tactical response time for long-range speed monitoring and early warning.

Wide Operating Temperature Range of -28°C to +48°C and AA Battery Power, Ensuring Continuous All-Region, All-Weather Duty Operation from Severe Cold to Extreme Heat
The device's operating temperature range covers -28°C to +48°C, with a storage temperature range of -40°C to +60°C. It is powered by standard AA batteries. It can operate stably and reliably at outdoor traffic accident scenes in the extreme cold of northern winters or during prolonged checkpoint speed measurement duties in the scorching heat of southern summers. The entire unit features a high-strength polycarbonate plastic housing that is robust and durable, weighing only approximately 794 grams. Its handheld design facilitates rapid deployment and operation at various types of scenes.

Compliant Application Scenarios

In-Depth Major Traffic Accident Investigation and Judicial Forensic Vehicle Speed Identification Scenario
In the judicial forensic identification of major, complex, or fatal traffic accidents, the forensic examiner carries this speed radar to the accident scene and conducts vehicle speed simulation measurements under the same road conditions and environment. This precisely acquires vehicle speed data under specific driving states. Combined with the length of braking marks left at the accident scene, the location of the collision point, and the extent of vehicle damage obtained from the scene investigation, the forensic examiner calculates the vehicle's traveling speed, initial braking speed, and collision energy based on the measured speed data and classical physics models. This provides critical scientific data support for accident reconstruction, liability determination, and the issuance of a vehicle speed identification report. After confirmation through statutory procedures, the measurement data can directly serve as the core technical basis for the expert opinion.

Critical Evidence Preservation Scenario for Suspect Vehicle Speeds in Vehicle-Related Criminal Cases
During the investigation of vehicle-related criminal cases such as dangerous driving, vehicle ramming, and endangering public safety by dangerous means, law enforcement officers use this speed radar to precisely measure and record the speed of the suspect vehicle in real time. During the on-site handling of highway chases, urban road interdictions, or public place ramming incidents, the device's 0.01-second instantaneous acquisition capability and ±0.1 mph ultra-high accuracy can precisely record the suspect vehicle's real-time speed. This speed data, serving as core objective evidence proving the suspect's subjective intent and the dangerousness of their behavior, can be directly used as evidence in court after confirmation through statutory procedures.

Instant Target Speed Intelligence Acquisition Scenario in Special Police Tactical Operations
During special police vehicle interdiction, VIP motorcade escort, or response to vehicle ramming incidents, special police scouts use this speed radar to monitor the speed of the target vehicle in real time from a safe distance. The device's high refresh rate of 100 times per second can instantly reflect the target's acceleration or deceleration intentions. Based on the real-time speed data, the commander assesses the threat level, predicts the trajectory, selects the optimal timing for interdiction, and evaluates the risk of the interdiction, providing precise dynamic intelligence support for tactical decision-making.

Quantitative Assessment Scenario for Police Driving Training and Equipment Effectiveness Evaluation
During police specialized driving training, instructors use this speed radar to perform high-precision quantitative recording of the instantaneous speed and speed change curves of training vehicles during subjects such as high-speed hazard avoidance, emergency braking, and precision interdiction. This provides objective data support for evaluating driving training effectiveness. During the performance testing of new police vehicles or drones before deployment, testing personnel can use this device to precisely measure and verify the speed performance of the equipment.

Core Technical Parameters

In terms of core speed measurement performance, the speed measurement range covers 8 to 240 km/h, with speed measurement accuracy of ±0.1 mph. The target speed acquisition time is 0.01 seconds (integer display) or 0.04 seconds (one-decimal-place display). The data refresh rate is 100 times per second (integer) or 30 times per second (one decimal place). For detection capability, the detection range for standard vehicle targets is a maximum of approximately 1.6 km, and for small targets such as baseballs, approximately 300 meters. For the microwave system, the operating frequency is 34.7 GHz (Ka-band), employing crystal polarization technology to enhance target identification and anti-interference capability, with an output power of 5 milliwatts. For display and operation, it is equipped with a backlit LCD screen. Power is supplied by standard AA batteries. For environmental adaptability, the operating temperature range is -28°C to +48°C, and the storage temperature range is -40°C to +60°C. For physical specifications, the housing is high-strength polycarbonate plastic, with dimensions of approximately 20cm × 8cm × 17cm, and a weight including batteries of approximately 794 grams.

Compliant Field Application Cases

A provincial judicial identification center accepted a commission to identify a fatal multi-vehicle chain-reaction collision on a highway. The central point of contention was whether the first vehicle's speeding had led to its inability to brake in time. The forensic examiner carried this Stalker Sport 2 Handheld Professional Speed Radar to the accident road section. Under the same road gradient, surface conditions, and weather conditions, a test vehicle of the same model as the accident vehicle was used to conduct vehicle speed simulation measurements. In integer display mode, the device, with its 0.01-second instantaneous response and ±0.1 mph ultra-high accuracy, precisely recorded the braking distance data of the test vehicle at different initial speeds. Combined with the length of the braking marks left at the accident scene, the forensic examiner calculated the traveling speed of the accident vehicle before braking based on the measured speed-braking distance relationship curve and issued a vehicle speed identification report. During court cross-examination, the forensic expert explained the measurement principle, accuracy specifications, and simulation experiment process of the speed radar to the court. The court admitted the expert conclusion and apportioned accident liability accordingly.

While investigating a case of endangering public safety by dangerous means, a municipal public security organ found that the suspect had been speeding on a city main road and rammed into multiple roadside stalls. During the subsequent investigation, law enforcement officers used this speed radar to conduct speed simulation measurements on a suspect vehicle of the same model on the incident road section, precisely acquiring the vehicle's speed data on the same driving path. Combined with the timestamp analysis of the surveillance footage from the incident scene, investigators accurately calculated the suspect vehicle's traveling speed at the moment of impact. This speed data, serving as key objective evidence proving the suspect's subjective intent and the dangerousness of their behavior, was transferred with the case file to the procuratorate for prosecution review. During the court proceedings, the defense challenged the method used to determine the vehicle speed. The forensic expert explained the technical principle and measurement accuracy of the Stalker radar in court. The court determined that the speed measurement data possessed scientific reliability and evidentiary validity and lawfully admitted it as evidence.

Manufacturer Information: Beijing Best United Technology Co., Ltd.
Website: https://www.bestlh.com
Address: Building C9, Jianziban, No.1 Courtyard, Jinghai Sixth Road, Yizhuang Development Zone, Beijing
Tel: 010-56526048