Document number 14418D27-01 76.5 GHz RCS Imaging Evaluation System (76.5GHz Imaging RADAR) MODEL : RCS05 FCC ID : 2AON3-RCS05 Instruction Manual Ver. 6.
Introduction This manual describes the function outline of the 76.5 GHz RCS Imaging Evaluation System (76.5 GHz Imaging RADAR), the name and description of each part, operating procedures, precautions on use, and so on. Safety Notices CAUTION A CAUTION notice denotes a hazard. It calls attention to an operating procedure, practice, or the like that, if not correctly performed or adhered to, could result in damage to the product or loss of important data.
1. System overview In this system, reflection distribution from the object to be measured such as automobile can be displayed as an image, and RCS * can be calculated from the measurement result. (RCS *: Radar Cross Section radar reflection cross section, expressed in m 2 in real number, in dBsm in logarithm) (1) Features of the system (a) Millimeter wave pulse radar with a center frequency of 76.5 GHz, which is a specific low power device without license.
Cell coordinates Pθ, Pφ Pθ=60,Pφ=40 Pθ=0,Pφ=40 Pθ=0,Pφ=0 Pθ=60,Pφ=0 The cell coordinates are the data cell number of the image screen. In the above figure, the range of horizontal 30 ° vertical 20 ° is measured in increments of 0.5 ° both in the horizontal and vertical directions, and is an example of the cell coordinates when the number N of data in the horizontal direction is 61 and the number M of data in the vertical direction is 41.
2. Explanation of each part (1) Rear Panel LED Power switch USB connector Synchronization signal for camera DC 12 V power connector The cross mark of the photograph is the center position of the mirror No. Name Description 1 LED Lights up when the power to the device is turned on. 2 Power switch This switch turns on / off power. Pressing "┃" side pushes it ON, pushing "○" side turns it OFF. 3 USB connector Connects to the measuring computer Connector for inserting the USB cable.
3. Measurement computer requirements The requirements of the measuring computer connected to this system are as follows. No. Item Requirement 1 CPU Intel Core 3 or higher 2 Memory 4G Bytes or more 3 HDD free space 32G Bytes or more 4 Display resolution 1280 x 1024 dots or more 5 I/O USB 2.
4. System startup and shutdown (1) Start up the system (a) Connect the instrument main unit and the measuring computer with a USB cable. (b) Turn on the power switch of the main unit. (Push the "┃" side of the locker switch in) (c) Turn on the measuring computer. (d) When the OS of the measurement computer starts, start the measurement program (76 GHz RCSimaging.exe). (CAUTION: Start up the measurement program after about 10 seconds elapsed after turning on the power of the unit.
6. Operation of measurement program The operation of each measurement screen of the measurement program is explained below. (1) Main screen This is the first screen displayed when starting the measurement program. Operate this screen to perform image data acquisition and RCS calculation operation. (8) (9) (1) (13 ) (10) (11) (2) (3) (14) (15) (12) (4) (7) (6) (5) No.
No. Name Operation explanation between distance and received power. (7) Pθ / Pφ Specify the cell coordinates on the screen for which you want to display the P (d)graph. You can also specify it by clicking on the image screen. ・Graph display Click to display the P (d) Graph. P (x) graph A graph can be displayed on the relationship between the x coordinate calculated from θ and distance d and received power. It is an area where setting for that is done.
（２）Setting parameters Open the "Settings" menu on the main screen. "Settings" menu When "Parameter Setting 1" is selected, the following screen will be displayed. The items that can be entered on the above screen are parameters related to the operation of the system, so there is no need to change it. If the system is operating normally, please do not change the value. To change the setting please enter the password "keycom123". A description of each parameter is explained in Appendix 2.
（３）Setting of turning motor When you select " Parameter Setting 2 (Setting of turning motor) " from "Settings" on the main screen, the following screen will be displayed. Items that can be entered on the above screen are parameters related to timing of measurement, so there is no need to change. If the system is operating normally, please do not change the value.A description of each parameter is explained in Appendix 2.
④Click the "Start Measurement" button to start acquiring data. ⑤If necessary, set the Max Level /Min Level of the image, Distance specifications, the P(d)/P(x) graph display. （６）Saving measured data (For each saved data format, refer to Appendix 1.) In addition to performing automatic saving of measured data, you can also execute it from the File menu. There are the following three types of storage.
７．Acquisition of RCS Acquiring the target’s RCS value is done in the following two steps. (1) Reference measurement of target with known RCS value (2) Measurement of RCS value unknown targets and RCS calculation The operation of each step is explained below. (1) Measure reference with known RCS value Measure the reflected reception power of the object to be measured (known target, CR corner reflector, etc.
input (Reference RCS) It is reflected in the system as a reference. The maximum value of the received power value which is phase-synthesized at the same distance Enter the RCS value (dBsm) for the reference here. and averaged at the selected range is displayed. The maximum peak value of the measured received power value is displayed. Enter the actual distance of the reference here. Click here to reflect the reference.
is read at the rising edge of the pulse, but the distance of the point where the amplitude exceeds 80% of the peak and the point where the power exceeds the peak of -2 dB is taken as the measurement distance of the IM radar. As an example, the P (d) graph of the target at 5.5 m is shown below. When you click the -2 dB point of the peak, the measured distance is displayed at the bottom of the screen. P (d) graph display of 5.
（３）Use of past measurement data In this system, it is possible to read the data file of the reference and the target previously measured and saved. (You can only read CSV files.) For example, it can be used to read past reference data and measure the RCS of a new target based on it. To read the data file, follow the procedure below. ①Select "Open" from the "File" menu on the main screen and open the saved file.
Q signals at the same time in the rectangular range of a part of the target are phase synthesized. In this method, the range synthesized by the beam width of the actual radar is different, so it is necessary to take this point into consideration in the short range. I and Q signals at the same time in the selected rectangular range are phase synthesized and multiple amplitude values are obtained within the selected distance (time) range.
１０．specification Model name RCS05 Frequency 76.5GHz (76-77GHz) RF Output Power + 6dBm typ. (+8～+4dBm) Radar system Pulse radar Emission identifier: P0N pulse width: 5ns pulse repetition frequency:1MHz Rated Supply Voltage +12V DC Horizontal Detection angle Angle steps for horizontal Angle resolution 33° Occupied frequency bandwidth: 1GHz Ant gain: 35dBi EIRP: +41dBm typ. (+43～+39dBm) 0.
(Appendix 1) Data format of saved files １．Multiple File format The measurement data file is a text file in CSV format and can be read by spreadsheet software such as Excel. The structure in the file is as follows, one file is created every time the image data is scanned once. Multiple File Header section Measurement data section Rectangular range data section Two-dimensional display section Each part will be explained below.
Target ←target with unknown RCS value Power[dBm]: 9.70802 -4.154127 (total power, peak power) RCS[dBsm]: -0.05798 -1.
２．Format of raw data file The raw data file is a text file in CSV format and can be read by spreadsheet software such as Excel. The configuration in the file is as follows, and the data for one scan of the image data is recorded.
(Appendix 2) Explanation of system parameters Parameters related to the operation of this system can be set from the screen. These parameters are described below. １．Parameter setting 1 No. Name 1 Limit sensor upper end 2 Tilt speed (RPM) Description The angle from the upper limit sensor position to the horizontal position in the tilt motion is expressed as the product of the motor moving step number (3000) and the gear ratio (19). One tilt rotation (360 °) corresponds to 57 thousand steps.
seconds) 2 Interval Frame Number The number of frames averaged. (Appendix 3) Maintain settings Various setting values are saved in the file named “initRADAR.dat”. When you log in to a personal computer with a user name and install a software from the CD-ROM, the initial “initRADAR.dat” is also saved in the same folder as the software exe file is. When you start up the software after installation, the software reads “initRADAR.dat”. But when you exit from the software, “initRADAR.
