Tianjin GNSS manufacturers a driving test system, the main features: 1) the use of the Compass and GPS Double Star Quad-band GNSS module, single or single Beidou GPS positioning can also be combined with RTK positioning 2) machine can achieve high-precision RTK positioning coordinates, azimuth and elevation angle (or roll angle) measurements, no differential source orientation function can be achieved. 3) Support PJK plane coordinate output, without third-party software to do the conversion projection 4) high dynamic data output update rate data support 1Hz, 2Hz, 5Hz, 10Hz 5) can customize the data output format 6) 450-470MHz ultra according to customer demand suitable for high-frequency radio base station and rover operations, communication protocol supports transparent transmission, TT450S 7) Built-in overvoltage overcurrent reverse voltage protection function 8) set aside to support Ethernet, GSM / GPRS communication 9) time synchronization support 1PPS Real-time output 10) support automatic differential, differential format support RTCM2.X, RTCM3.X and CMR 11) two power ports, two serial ports, users more flexible 12) internal storage for 100M, the original data can be set to automatically record 13) highly flexible receiver, antenna split design can be applied to a variety of attitude measurement system 14) Attitude Measurement accuracy is superior to provide static or dynamic, real-time platform for precise heading, pitch (or roll) attitude angle. 2, the base station site must first choose a suitable location for the construction of a base station, usually selected height, the open position, from easy to produce feature multi-path effects (such as tall buildings, trees, water, beach and easy water zone, etc.) a distance not less than 200 m; try to ensure that 15 degrees above the horizon without cover; from electromagnetic interference zones (such as microwave stations, radio transmitters, power lines across the zone, etc.) a distance not less than 200m; avoid vibration prone areas. Construction process according to the surrounding environment needs, location, and the owners are sure to maintain stability of its antenna, solid. 3. After selecting the location of the base station signal test, you first need to make the appropriate signal quality test to see here after the erection of equipment, to see whether good Star Search (not visible due to the presence of interference in many places, such as the GPS satellite L1 or L2 BDS interfering signals and satellite signals B1 or B2, resulting in abnormal search star, affect the results), we can take a period of [test] data to analyze. ] [Opentestdata on emission test data to obtain if the satellite signal quality to meet the requirements, we can determine the location of the base station set up to secure the GNSS antenna, the antenna should be kept level. Next to get the coordinates of the base station began. Baseline RTK systems are standing in a key part in the whole process of using the system, to ensure the accuracy of the base station coordinates. Get detailed method and set the reference base station coordinates "base station setup instructions." Note: ① base station coordinates must make a record and save. GNSS reference station antenna ② firm must ensure that, once the location of the base station antenna is changed, it will lead to our mobile stations collected data and maps to produce a certain bias. Misjudgment, affect the operation of the entire examination system. ③ To avoid accidental factors causing the base station location is destroyed after the completion of the base station erected in the vicinity of the base station to make a fixed check point, and measured using the mobile station latitude and longitude coordinates of the point and saved as a backup station (case of an accident immediately use). Please do not modify (Radio Set reference "PDL radio setup instructions") ④ After setting up the radio parameters. After ⑤ PDL radio setup is complete, you can use the buttons on the front panel by selecting the corresponding channel to adjust the frequency. ⑥ radio serial port baud rate must be consistent with the baud rate of the base station receiver. ⑦ venue exam venue when the base station does not exceed the maximum distance 2KM must use a low-power radio stations. ⑧ ensure that no people around them use the same frequency interfere with communications equipment to us, we want to change once found on other radio frequencies to ensure that the mobile station equipment is working properly. ⑨ after the end of the examination must be given a power failure, one hour before the start of the exam the next day to supply power. Auxiliary driving test evaluation system advantages: 1, high accuracy. Evaluation method using GNSS pressure line, precision ≤2cm (Ian plane precision GNSS equipment as: 1cm + 1ppm), all users feedback measurement accuracy is significantly higher than the traditional method. 2, high efficiency construction site. Especially for the two subjects, no longer need throughout the various sensors and cables underground, and only need to be present on the ground to draw marking, construction efficiency is greatly improved. 3, the failure rate is relatively low, and easy maintenance. The more sensors, the higher the probability of failure, but also for buried sensors, maintenance is very difficult, even more importantly, once a project sensor fails, all cars can not test, and driving test program based GNSS systems, must Most of the maintenance work in the car, the maintenance workload is relatively small, a car failure does not affect the normal operation of the other car. 4, GNSS system is easy to install hardware, antenna, cable and receiver are installed in the car or on the surface of the car, no special requirements. 5, GNSS more types of products, you can choose according to different subjects two, three subjects and the use of different types of products, so that the cost of the best. 6, using the Beidou satellite positioning, in view of the Beidou system coverage than other satellite systems in Asia, so positioning is relatively high efficiency, and the ability to adapt to a variety of harsh environments. 7, auxiliary driving test evaluation software (spatial analysis section), using a point in the plane, the line two lines intersect determine methods to ensure the accuracy of the judgment, and the output of multiple packet formats to choose to use. 8, driving test software starts after the auxiliary judge, in the form of computer services running in the background automatically, convenient and user software docking. 1, GNSS portion (can be used independently) GNSS (BDS + GPS) system, provide high-precision location information. 2, auxiliary software part (choose) spatial analysis software, using a fine spatial analysis algorithms to accurately determine the vehicle status (whether the pressure line, etc.) in the examination room. 1, high precision evaluation 2, high efficiency 3 exam venue construction, low failure rate, convenient 4, GNSS equipment easy to install 5-day test drive space analysis software Chen Beidou satellite navigation technology (Tianjin) Co., maintenance, Tianjin GNSS driving test system factory