Radar structural characteristics:
1. Unique weight (220 g) and size.
2. One of the world's smallest speed sensors.
3. Standard, widely applicable DB9 interface connecting COM-port (using data lines from other manufacturers).
4. Creative safety and convenient design.
5. The sensor shell is made of impact-resistant ABC plastic (brand NOVODUR).
6. Two kinds of fixing methods: movable-fixed with VELCRO belt and fixed-fixed with fixed screw.
The main functions and possibilities of radar:
1. Exchange data with external devices through two interfaces: USB or any of RS-232 (depending on the subscriber's choice).
2. The new method of calculating three modes of signal processing ensures the fast response and stable operation of the patrol vehicle in the moving state.
3. The working frequency is within K-range.
4. Choose the direction of motion: reverse, co-directional or all targets.
5. Velocity measurement in fixed mode and patrol vehicle motion mode.
6. Separate the fastest and/or most recent targets from the vehicle fleet.
7. Two values are obtained in one measurement, which can be used to evaluate the road condition in traffic flow more accurately.
8. Open communication protocol to connect other devices in radar and speed measurement systems.
9. Low energy consumption and wide range of speed measurement (10-250 km/h).
Technical parameters and indicators of radar:
Parametric values
Working frequency 24.15 GHZ (K-range)
Velocity measuring distance (sensitivity), not less than 500 meters
Velocity range 10-300 km/h
Velocity measurement error, not more than fixed-plusmn; 1.0 km/h mobile-plusmn; 2.0 km/h
When choosing the fastest target, the difference between the target speed and the train speed is 3.0 km/h in the direction of the target and 5.0 km/h in the direction of the reverse target.
The span of degree limit is 1 km/h
The maximum power required (for speed measurement) is not more than 25 mW
Rated Voltage 12V (Vehicle 9-15V)
Velocimeter weighs 220 grams
Velocimeter size 102*68*55 mm
Operation mode:
The spark radar's work and data transmission are accomplished through serial port. The command format is divided into upload and download commands. The upload commands are mainly the radar's command response to the host computer and the transmission of test data. The download commands are the transmission of radar commands from the host computer.
It is to pass the command and return the test results. To enter the connecting state, you only need to issue the connecting command. The command is two bytes, and we usually send hexadecimal Fe and a1.
In order classification, the spark radar adopts a two-byte command mode. The first byte is the value of recognition byte greater than F0, and the second byte is the parameter byte. The range of value is less than F0. Therefore, when receiving data, we can distinguish the first byte from the second byte by judging whether the value is greater or less than F0.
In the working state, the radar can receive either the state setting command or the test command. The spark radar's test mode is trigger test, which triggers a test every time it receives a test command. When the test is finished, the test result is sent back.
In setting the working state, we should set the corresponding working state according to the specific situation.
Static working state: suitable for testing at a fixed point. Radar is in a fixed state. According to the actual environment, it can be divided into co-direction testing, reverse testing and bidirectional testing.
Static co-directional test: Only the radar points to the same moving target, which can effectively avoid the impact of the reverse interference target on the test.
The settings are as follows:
First send Fe 35, then Fe 3d, then send the test command Fe 3f, and then wait for the test results to return. The processing of test results is also to find the first byte first to see if it corresponds to the byte representing speed, if it corresponds. Then send to follow-up processing, after a test, if you need to test again, send a test command again.
Static Reverse Testing: Measuring only the moving target pointing to the opposite direction can effectively avoid the influence of the same direction interference target on the testing.
The settings are similar
Static bidirectional: Both of the above measurements are similar to the general radar mode of operation.
Second, dynamic, general radar installed in the patrol car, need to measure their own speed and target speed. So when data is returned, it contains its own speed.
Dynamic co-direction: Target and patrol vehicle are running in the same direction.
Dynamic Reverse: Target and Patrol Vehicle travel in the opposite direction.
Speed limit setting and test distance setting:
A speed limit can be set for different sections, and the system can send out test values that exceed his values. According to the number of vehicles, the interference in the distance can be reduced by setting the range of radar.
The specific operation can select the corresponding instructions according to the command table.
Method of operation:
1. Check the connection correctly and turn on the power supply when the voltage is normal. The work indicator glows red.
Secondly, the host sends the connecting command to connect the host computer and radar. At this time, the working indicator lights emit green light, indicating that the connecting machine is normal.
3. After connecting the machine normally, according to the working mode, the corresponding control commands are issued according to the working status requirements, and the working status of the radar is set up.
4. After setting up, the test command is issued and the radar begins to measure.
5. After the radar test is completed, the test data will be sent to the host computer.
6. Measure again and repeat four or five.
All the above specific settings can be referred to in the following table: (send Fe first and then send the following code)
Code Meaning PC Receiver
Response Spark Receiver PC
Send out
35 The static way is yes
36 The dynamic way is yes
Yes or No in 39 operating distance
The maximum distance of 3A is yes.
The minimum distance of 3B is yes.
3. The reverse measurement is yes or no.
3-D co-directional measurement is yes
3E bidirectional all objectives are
3F Start Measuring Is Not
40 Press the trigger, no, No.
41 Release the trigger.
42 trigger status is not
Does Radar Measure Velocity Backward?
50 Device Command Receiving Ready Is Yes
Fifty-one equipment in use is yes
53 Radar forward test is yes
8x Spark Series CPU Recognition
Ax Controller Recognizes that x is not
Commands sent out generally require the radar to send out the corresponding response signal, when the response is correct, indicating that the setup is successful. The command to answer is fd. Following the parameters set.
The measured velocity information is sent out at the end of the measurement. The unit of velocity is km/h.
The meaning of data transmitted from radar can be referred to in the following table:
Imperial Meaning
0xF1 Target Speed
0xF2 strongest signal velocity target
Two objectives of 0xF3-0xF7 (presupposition)
0xF8 Self-Speed
Speed Limit Settings for 0xF9, 0xFA
Fe 2e Radar Stops Operating
According to the corresponding command code, the corresponding data can be read out.
Radar Serial Port Setting Parameters
Baud rate 9600 bit/s
Word length 8 bits
No effect was found.
