CN112763990B - Novel radar response signal simulator - Google Patents
Novel radar response signal simulator Download PDFInfo
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- CN112763990B CN112763990B CN202011384900.2A CN202011384900A CN112763990B CN 112763990 B CN112763990 B CN 112763990B CN 202011384900 A CN202011384900 A CN 202011384900A CN 112763990 B CN112763990 B CN 112763990B
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- 238000012360 testing method Methods 0.000 claims description 15
- 230000017525 heat dissipation Effects 0.000 claims description 13
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 5
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
- G01S7/4052—Means for monitoring or calibrating by simulation of echoes
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a novel response signal simulator, which comprises a control box cover, wherein a control and input/output signal panel is arranged on the upper surface of the control box cover, a storage battery and a pulse signal generating plate are arranged in the control box cover, and a radio frequency oscillator, a directional coupler, an adjustable attenuator and a waveguide are sequentially connected to the outside for coaxial conversion; the signal panel is provided with an input switch corresponding to the pulse signal generating board and used for triggering signals, bow signals and azimuth signals, and a video plug and socket corresponding to the display, the simulator generates six-bit pulse signals to be output, the pulse signal generating board generates six-bit pulse signals comprising a start bit, a stop bit and a middle four-bit coding bit through the FPGA, the six-bit pulse signals are modulated by the radio frequency oscillator to generate radio frequency signals and modulation signals, the radio frequency signals and modulation signals are isolated by the directional coupler and then output a modulation signal matched with the sensitivity of a receiver of the radar system to be tested, the signal is output to the adjustable attenuator, the modulation signal is superimposed on the isolated modulation signal, and the signal is output to the waveguide to be coaxially converted and then output to the radar system to be tested.
Description
Technical Field
The invention belongs to the technical application field of guidance of navigation radar helicopters for ships, and particularly relates to a radar response signal simulator.
Background
In the development and debugging processes of some systems, such as modern radar systems, mobile phone communication systems and satellite communication systems, the performance and index test of the developed objects is an important link. The traditional test method adopts a repeated actual use environment, and a test prototype or tested equipment is put into the test prototype to verify the performance and the index of the test prototype or tested equipment, so that the research and development cost and the time cost are greatly increased, and the performance detection and calibration after the product is put into operation are more time-consuming and labor-consuming. If the special signal simulator can be designed, the performance detection and calibration of tested equipment in multiple scenes and complex environments can be met, the product research and development period and the test time after production can be greatly shortened, and the device has the advantages of repeatability and high flexibility. However, most of the current signal testers adopt DSP serial devices as key components in a digital signal processing system, and the programmable performance of the current signal testers is simpler than that of FPGA. In addition, there is another radar response signal generator in the prior art, in order to simulate the actual use environment, various parts such as an antenna are required to be equipped, which brings a large burden to the test work, and the radar response signal generator cannot be applied in places without power supply due to the limitation of the power supply condition.
Disclosure of Invention
The invention aims to overcome the defects of the traditional radar response signal test method which adopts a repeated practical use environment and places tested equipment into the test method and related equipment, and provides a special signal simulator for detecting the sensitivity of the marine navigation radar for receiving the helicopter response signal and verifying whether the tested radar can correctly decode and display the received response signal, thereby improving the efficiency of acceptance work and laying a foundation for smooth progress of a helicopter guiding test.
The aim of the invention is achieved by the following technical scheme.
The novel response signal simulator is characterized by comprising a control box seat and a control box cover, wherein the upper surface of the control box cover is provided with a control and input/output signal panel, a rechargeable storage battery is fixed at the bottom of the inner side of the control box, a pulse signal generating plate is connected to the upper side of the storage battery, a radio frequency oscillator, a directional coupler, an adjustable attenuator and a waveguide are sequentially connected to the outer part of the control box, and the output end of the waveguide coaxial conversion is connected with a radar system to be tested; the side face of the control box is connected with a power main switch and a power charging socket;
the control and input/output signal panel is provided with six input switches which are correspondingly connected with the pulse signal generating plate and are used for triggering signals, bow signals and azimuth signals; the simulator generates six-bit pulse signals to be output;
The pulse signal generating board is used for generating a six-bit pulse signal comprising a start bit, a stop bit and a middle four-bit coding bit through an FPGA by using an input trigger signal, a stem signal and an azimuth signal;
the rechargeable storage battery is used for providing 24V voltage required by the operation of the pulse signal generation plate and energy required by the continuous operation of the simulator;
The radio frequency oscillator is used for modulating the six-bit pulse signal to generate a radio frequency signal and a modulation signal;
The directional coupler is used for isolating the modulation signal generated by the radio frequency oscillator, outputting a modulation signal matched with the sensitivity of the receiver of the radar system under test, and outputting the signal to the adjustable attenuator;
The adjustable attenuator is used for providing an adjustable attenuation range, superposing the adjustable attenuation range on the isolated modulation signal and outputting the signal to the waveguide for coaxial conversion;
The waveguide coaxial conversion is used for converting the modulation signal into a high-frequency analog signal and outputting the high-frequency analog signal to the tested radar system.
Preferably, the program logic of the pulse signal generating board is that the rechargeable storage battery provides 24V power, and +5V, +3.3V, +2.5V, +1.8V and-12V voltages are respectively provided for relevant components of the pulse signal generating board after the conversion of the power conversion part; the signals are transmitted to the level conversion circuit and the filter circuit module through the input switches of the trigger signal, the stem signal and the azimuth signal, then are transmitted to the FPGA main control core board together with the code input through the buffer isolation circuit, and finally are transmitted to the regulating pulse output module through the driving circuit module.
Preferably, after the simulated response signal is input to the radar system through the coaxial conversion of the waveguide, the adjustable attenuator is adjusted to detect whether the sensitivity of the response signal received by the radar system and the character decoding function of the helicopter are normal.
Preferably, a power protection switch and a current-voltage monitoring meter connected with the power output are arranged on the panel.
According to the heat dissipation design, the simulator can work stably and reliably, the main heating element comprises the heat dissipation fins formed by the power element through the good heat conductors bonded by the heat conduction glue, and the heat dissipation fins are arranged along the vertical direction so as to facilitate natural convection heat dissipation.
The beneficial effects of the invention are as follows:
1. the invention simplifies the key structure of signal simulation, directly receives the navigation radar for the ship to be tested, facilitates the test and improves the test efficiency;
2. The rechargeable storage battery is self-arranged, the test is not limited by environmental conditions, and the influence of the terrain environment and clutter on the test data can be reduced;
3. conventional equipment such as an antenna is not needed, and the operation is simpler and more convenient;
4. Transmitting the simulated response signal to the radar system, and adjusting the adjustable attenuator knob to enable a response target to be stably and clearly displayed on the radar screen and enable a character column to display the corresponding character at the moment;
5. the power protection switch and the current-voltage monitoring meter are arranged, so that the safety and reliability of the equipment are improved;
6. Compared with the existing tester, the manufacturing cost is lower;
7. the heat dissipation design enables the simulator to work more stably and reliably.
Drawings
FIG. 1 is a schematic exploded view of one embodiment of the present invention;
FIG. 2 is a schematic diagram of the hardware circuit configuration of the pulse signal generating board according to the embodiment of the present invention;
FIG. 3 is a program logic diagram of a pulse signal generation board in an embodiment of the present invention;
fig. 4 is a schematic view of the coaxial waveguide transition.
In the figure: a control box base 1; a control box cover 2; a control and input/output signal panel 3; a storage battery 4; a pulse signal generation board 5; a radio frequency oscillator 6; a directional coupler 7; an adjustable attenuator 8; waveguide coaxial switching 9; a power supply main switch 10; a power supply charging socket 11; a power protection switch 12; a current-voltage monitor table 13; an input switch 14; video plug and socket 15; a power supply conversion section 41; a voltage 42; a trigger signal 51; a bow signal 52; an azimuth signal 53; a level shifter circuit and filter circuit block 54; an encoded input 55; a buffer isolation circuit 56; an FPGA master core panel 57; a drive circuit module 58; a dispensing pulse output module 59.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the attached drawings: the present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are provided, but the protection scope of the present invention is not limited to the following embodiments.
Examples: the novel response signal simulator comprises a control box seat 1 and a control box cover 2, wherein the upper surface of the control box cover 2 forms a control and input/output signal panel 3, a rechargeable storage battery 4 is fixed at the bottom of the inner side of the control box seat 1, a pulse signal generation plate 5 is connected to the upper side of the storage battery 4, a radio frequency oscillator 6, a directional coupler 7, an adjustable attenuator 8 and a waveguide coaxial conversion 9 are sequentially arranged outside the control box, and the output end of the waveguide coaxial conversion 9 is connected with a radar system to be tested; the side face of the control box is connected with a power main switch 10 and a power charging socket 11; a power protection switch 12 and a current-voltage monitoring table 13 connected with a power output are arranged on the panel, and referring to fig. 1, the connecting screw of each component is shown beside each corresponding component in fig. 1, but no symbol is marked.
The control and input output signal panel 3 is provided with six input switches 14 for triggering signals 51, bow signals 52 and azimuth signals 53, which are correspondingly connected with the pulse signal generating board 5, and with four pairs of video plugs and sockets 15, which correspondingly connect the pulse signal generating board 5 with the display.
The pulse signal generating board 5 is a PCB circuit board, and generates six-bit pulse signals including a start bit, a stop bit and a middle four-bit encoding bit by the input trigger signal 51, stem signal 52 and azimuth signal 53 through the FPGA main control core board 57, see fig. 2.
The program logic block diagram of the pulse signal generating board 5 is shown in fig. 3, 24V power is provided by the rechargeable battery 4, +5v, +3.3v, +2.5v, +1.8v and-12V voltages 42 are provided for relevant components of the pulse signal generating board 5 after being converted by the power conversion part 41, the signals are transmitted to the level conversion circuit and filter circuit module 54 through the input switch 14 of the trigger signal 51, the bow signal 52 and the azimuth signal 53, then transmitted to the FPGA main control core board 57 together with the code input 55 through the buffer isolation circuit 56, and finally transmitted to the dispensing pulse output module 59 through the driving circuit module 58.
The rechargeable battery 4 is a lithium battery for supplying 24V voltage required for the operation of the pulse signal generating plate 5 and energy required for the continuous operation of the simulator.
The radio frequency oscillator 6 is used for modulating the six-bit pulse signal to generate a radio frequency signal and a modulation signal.
The directional coupler 7 is used for isolating the modulation signal generated by the radio frequency oscillator 6, outputting a modulation signal matched with the sensitivity of the receiver of the radar system under test, and outputting the signal to the adjustable attenuator 8.
The adjustable attenuator 8 is used for providing an adjustable attenuation range, superposing the modulated signal after isolation, and outputting the signal to the waveguide coaxial switch 9.
The waveguide coaxial converter 9 is used for converting the modulation signal into a high-frequency analog signal and outputting the high-frequency analog signal to the radar system under test. See fig. 4.
After the simulated response signal is input to the radar system through the waveguide coaxial conversion 9, the adjustable attenuator 8 is adjusted to adjust the intensity of the output signal, so that whether the sensitivity of the response signal received by the radar system and the character decoding function of the helicopter are normal can be detected.
When the radar response signal simulator works, the state of the radar to be tested is switched to an ultra-long pulse state, and the radar waits; the analog response signal is sent to the radar system, and the adjustable attenuator 8 knob is adjusted, so that a response target can be stably and clearly displayed on the radar screen, and the character bar displays the corresponding character at the moment.
For example: the dial switch of the character on the simulator control box selects 1111, so that a simulated target can be displayed on the screen of the radar system, and the character bar displays H15; at this time, the adjustable attenuator 8 is adjusted to increase attenuation, so that the echo intensity of a simulation target on a radar screen is gradually weakened, a critical position where the target can be just displayed and a character column can read out a correct character is found, a scale value los 2 on the adjustable attenuator 8 at this time is recorded, and the sensitivity of a radar receiving response signal is calculated according to the following formula:
X＝P1-Loss1-Loss2
P 1 is the emitted output power of the radio frequency oscillator 6 and los 1 is the fixed attenuation value of the directional coupler 7.
The technical method provided by the invention can effectively detect the sensitivity of the marine navigation radar for receiving the helicopter response signal without external power supply, and verify whether the detected radar can correctly decode and display the received response signal.
The main heating element comprises a heat dissipation fin formed by a power element and a good heat conductor through heat conduction glue, and the heat dissipation fin is arranged along the vertical direction so as to facilitate natural convection heat dissipation. The reasonable heat dissipation design enables the simulator to work more stably and reliably.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The novel radar response signal simulator is characterized by comprising a control box seat and a control box cover, wherein the upper surface of the control box cover is provided with a control and input/output signal panel, a rechargeable storage battery is fixed at the bottom of the inner side of the control box, a pulse signal generating plate is connected to the upper side of the storage battery, a radio frequency oscillator, a directional coupler, an adjustable attenuator and a waveguide are sequentially connected to the outer part of the control box, and the output end of the waveguide coaxial conversion is connected with a radar system to be tested; the side face of the control box is connected with a power main switch and a power charging socket;
the control and input/output signal panel is provided with six input switches which are correspondingly connected with the pulse signal generating plate and are used for triggering signals, bow signals and azimuth signals; the simulator generates six-bit pulse signals to be output;
The pulse signal generating board is used for generating a six-bit pulse signal comprising a start bit, a stop bit and a middle four-bit coding bit through an FPGA by using an input trigger signal, a stem signal and an azimuth signal;
the rechargeable storage battery is used for providing 24V voltage required by the operation of the pulse signal generation plate and energy required by the continuous operation of the simulator;
The radio frequency oscillator is used for modulating the six-bit pulse signal to generate a radio frequency signal and a modulation signal;
The directional coupler is used for isolating the modulation signal generated by the radio frequency oscillator, outputting a modulation signal matched with the sensitivity of the receiver of the radar system under test, and outputting the signal to the adjustable attenuator;
The adjustable attenuator is used for providing an adjustable attenuation range, superposing the adjustable attenuation range on the isolated modulation signal and outputting the signal to the waveguide for coaxial conversion;
The waveguide coaxial conversion is used for converting the modulation signal into a high-frequency analog signal and outputting the high-frequency analog signal to the tested radar system.
2. The novel radar response signal simulator of claim 1, wherein the program logic of the pulse signal generating board is that the rechargeable battery provides 24V power, and +5v, +3.3v, +2.5v, +1.8v and-12V voltages are respectively provided to the relevant components of the pulse signal generating board after being converted by the power conversion part; the signals are transmitted to the level conversion circuit and the filter circuit module through the input switches of the trigger signal, the stem signal and the azimuth signal, then are transmitted to the FPGA main control core board together with the code input through the buffer isolation circuit, and finally are transmitted to the regulating pulse output module through the driving circuit module.
3. The novel radar response signal simulator of claim 2, wherein the simulated response signal is input to the radar system via waveguide coaxial conversion, and the adjustable attenuator is adjusted to detect whether the response signal receiving sensitivity and the character decoding function of the radar system are normal.
4. A novel radar response signal simulator according to claim 1,2 or 3, wherein a power protection switch and a current voltage monitor connected to the power output are provided on the panel.
5. The novel radar response signal simulator according to claim 4, wherein the heat dissipation design enabling the simulator to work stably and reliably is characterized in that the main heating element comprises heat dissipation fins formed by the power element by utilizing a good heat conducting body through heat conduction and bonding, and the heat dissipation fins are arranged along the vertical direction so as to facilitate natural convection heat dissipation.
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| CN202011384900.2A CN112763990B (en) | 2020-11-30 | 2020-11-30 | Novel radar response signal simulator |
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| CN214703969U (en) * | 2020-11-30 | 2021-11-12 | 上海广电通信技术有限公司 | Novel radar response signal simulator |
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| FR2569857B1 (en) * | 1982-10-13 | 1988-05-13 | Trt Telecom Radio Electr | ELECTRICALLY VARIABLE DELAY SIMULATOR FOR FREQUENCY MODULATED CONTINUOUS WAVE DISTANCE MEASUREMENT APPARATUS |
| CN102183742B (en) * | 2011-01-12 | 2013-05-29 | 中国人民解放军海军航空工程学院青岛分院 | Coherent radar target echo signal simulating method and device |
| CN104502897B (en) * | 2014-12-17 | 2017-04-12 | 上海广电通信技术有限公司 | Self-test code emitter for helicopter pilot system |
| EP3271966A1 (en) * | 2015-03-20 | 2018-01-24 | AMI Research & Development, LLC | Passive series-fed electronically steered dielectric travelling wave array |
| CN107706707B (en) * | 2017-10-27 | 2019-07-26 | 北方工业大学 | Low noise acousto-optic multifrequency tunable oscillator |
| CN207689662U (en) * | 2018-01-24 | 2018-08-03 | 成都思凯诺克科技有限公司 | A kind of fire control radar adaptive box |
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| CN214703969U (en) * | 2020-11-30 | 2021-11-12 | 上海广电通信技术有限公司 | Novel radar response signal simulator |
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