阅读说明：本技术 一种新型的雷达应答信号模拟器 (Novel radar response signal simulator ) 是由 苏诚 陈智慧 孙联雷 于 2020-11-30 设计创作，主要内容包括：本发明公开一种新型的应答信号模拟器,包括在控制盒盖上表面设操控和输入输出信号面板,内设蓄电池和脉冲信号发生板,外部依次连有射频振荡器、定向耦合器、可调衰减器和波导同轴转换；信号面板设有与脉冲信号发生板对应的用于触发信号、船艏信号和方位信号的输入开关和与显示器对应的视频插头插座,模拟器产生六位脉冲信号输出,脉冲信号发生板将输入信号通过FPGA产生包含起始位、终止位和中间四位编码位的六位脉冲信号,再由射频振荡器调制产生射频信号和调制信号,经定向耦合器隔离后输出一个匹配受测雷达系统接收机灵敏度的调制信号,该信号输出给可调衰减器,叠加于隔离后的调制信号,并将信号输出给波导同轴转换再输出至受测雷达系统。(The invention discloses a novel response signal simulator, which comprises a control and input/output signal panel arranged on the upper surface of a control box cover, a storage battery and a pulse signal generating board arranged in the control box cover, and a radio frequency oscillator, a directional coupler, an adjustable attenuator and waveguide coaxial conversion which are sequentially connected outside the control box cover; the signal panel is provided with an input switch which is corresponding to the pulse signal generating board and used for triggering signals, bow signals and azimuth signals and a video plug socket which is corresponding to the display, the simulator generates six-bit pulse signal output, the pulse signal generating board generates six-bit pulse signals which comprise a start bit, an end bit and a middle four-bit coding bit through an FPGA (field programmable gate array), then the six-bit pulse signals are modulated by a radio frequency oscillator to generate radio frequency signals and modulation signals, the radio frequency signals and the modulation signals are isolated by a directional coupler and then output to a modulation signal which is matched with the sensitivity of a receiver of the radar system to be tested, the signals are output to an adjustable attenuator and superposed on the isolated modulation signals, and the signals are output to a waveguide for coaxial conversion and then output to the radar system to be.)

1. A novel response signal simulator is characterized by comprising a control box base and a control box cover, wherein the upper surface of the control box cover is provided with a control and input/output signal panel, the bottom of the inner side of the control box is fixedly provided with a rechargeable storage battery, the upper side of the storage battery is connected with a pulse signal generating board, the outside of the control box is sequentially connected with a radio frequency oscillator, a directional coupler, an adjustable attenuator and waveguide coaxial conversion, and the output end of the waveguide coaxial conversion is connected with a radar system to be tested; the side surface of the control box is connected with a power supply main switch and a power supply charging socket;

the control and input/output signal panel is provided with six input switches which are correspondingly connected with the pulse signal generating board and used for triggering signals, bow signals and azimuth signals; the simulator is provided with four video plugs and four sockets which correspondingly connect the pulse signal generating board with the display, and the simulator generates six-bit pulse signals to be output;

the pulse signal generating board generates a six-bit pulse signal comprising a start bit, an end bit and a middle four-bit coding bit by using the input trigger signal, the bow signal and the azimuth signal through the FPGA;

the rechargeable storage battery is used for providing 24V voltage required by the work of the pulse signal generating board and energy required by the continuous work 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 to be tested, and outputting the signal to the adjustable attenuator;

the adjustable attenuator is used for providing an adjustable attenuation range, overlapping the isolated modulation signal and outputting the signal to the waveguide coaxial conversion;

and 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 radar system to be tested.

2. The novel answer signal simulator of claim 1, wherein the program logic of the pulse signal generating board is that the rechargeable battery provides 24V power, and after the power is converted by the power conversion part, the rechargeable battery provides +5V, +3.3V, +2.5V, +1.8V and-12V voltages to the relevant components of the pulse signal generating board; all signals are transmitted to the level conversion circuit and the filter circuit module through input switches of a trigger signal, a bow signal and an azimuth signal, then transmitted to the FPGA main control core board through the buffer isolation circuit together with the coding input, and finally transmitted to the adjustment pulse output module through the driving circuit module.

3. The novel answer signal simulator of claim 2, wherein after the simulated answer signal is inputted to the radar system through the waveguide coaxial switch, the adjustable attenuator is adjusted to detect whether the sensitivity of the radar system for receiving the answer signal and the helicopter character decoding function are normal.

4. A novel answer signal simulator according to claim 1, 2 or 3, wherein a power protection switch and a current and voltage monitoring meter are provided on the panel, connected to the power supply output.

5. The novel answer signal simulator of claim 4, wherein the simulator is designed to be stable and reliable, and the main heating element comprises a power element and a heat dissipation fin formed by a good heat conductor bonded to the power element, and the heat dissipation fin is vertically arranged to facilitate natural convection heat dissipation.

Technical Field

The invention belongs to the field of application of a guiding technology of a marine navigation radar helicopter, and particularly relates to a radar response signal simulator.

Background

In the process of developing and debugging some systems, such as modern radar systems, mobile phone communication systems and satellite communication systems, the performance and index of a developed object are important to be tested. The traditional test method is to reproduce the actual use environment and place a test prototype or tested equipment into the test prototype or the tested equipment to verify the performance and indexes of the test prototype or the 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 time-consuming and labor-consuming. If a special signal simulator can be designed, the performance detection and calibration of the tested equipment under the multi-scene and complex environment can be met, the product development period and the time for testing after production can be greatly shortened, and the advantages of repeatability and high flexibility are achieved. However, most of the current signal testers adopt DSP series devices as key components in a digital signal processing system, and the programmable performance of the current signal testers is simpler than that of FPGAs. In the prior art, a radar response signal generator needs to be equipped with various parts such as an antenna in order to simulate the actual use environment, which brings a large burden to the test work, and the radar response signal generator cannot be applied in a place without a power supply due to the limitation of the power supply condition.

Disclosure of Invention

The invention aims to overcome the defects of a test method for reproducing an actual use environment and placing a tested device in the environment in the traditional radar response signal test and related devices, and provides a special signal simulator for detecting the sensitivity of a ship navigation radar for receiving a 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 the smooth operation of a helicopter guide test.

The purpose of the invention is realized by the following technical scheme.

A novel response signal simulator is characterized by comprising a control box base and a control box cover, wherein the upper surface of the control box cover is provided with a control and input/output signal panel, the bottom of the inner side of the control box is fixedly provided with a rechargeable storage battery, the upper side of the storage battery is connected with a pulse signal generating board, the outside of the control box is sequentially connected with a radio frequency oscillator, a directional coupler, an adjustable attenuator and waveguide coaxial conversion, and the output end of the waveguide coaxial conversion is connected with a radar system to be tested; the side surface of the control box is connected with a power supply main switch and a power supply charging socket;

the control and input/output signal panel is provided with six input switches which are correspondingly connected with the pulse signal generating board and used for triggering signals, bow signals and azimuth signals; the simulator is provided with four video plugs and four sockets which correspondingly connect the pulse signal generating board with the display, and the simulator generates six-bit pulse signals to be output;

the pulse signal generating board generates a six-bit pulse signal comprising a start bit, an end bit and a middle four-bit coding bit by using the input trigger signal, the bow signal and the azimuth signal through the FPGA;

the rechargeable storage battery is used for providing 24V voltage required by the work of the pulse signal generating board and energy required by the continuous work 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 to be tested, and outputting the signal to the adjustable attenuator;

the adjustable attenuator is used for providing an adjustable attenuation range, overlapping the isolated modulation signal and outputting the signal to the waveguide coaxial conversion;

and 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 radar system to be tested.

Preferably, the program logic of the pulse signal generating board is that the rechargeable storage battery provides 24V power supply, and after the power supply is converted by the power supply conversion part, the rechargeable storage battery respectively provides +5V, +3.3V, +2.5V, +1.8V and-12V voltages for all relevant components of the pulse signal generating board; all signals are transmitted to the level conversion circuit and the filter circuit module through input switches of a trigger signal, a bow signal and an azimuth signal, then transmitted to the FPGA main control core board through the buffer isolation circuit together with the coding input, and finally transmitted to the adjustment pulse output module through the driving circuit module.

In the preferred scheme, after the simulated response signal is input to the radar system through waveguide coaxial conversion, the adjustable attenuator is adjusted to detect whether the sensitivity of the radar system for receiving the response signal and the helicopter character decoding function are normal.

Preferably, a power protection switch and a current and voltage monitoring meter connected with the power output are arranged on the panel.

The simulator has the advantages that the simulator can stably and reliably work in a heat dissipation design, the main heating components comprise heat dissipation fins formed by power elements and good heat conductors bonded by heat conduction glue, and the heat dissipation fins are arranged in the vertical direction to facilitate natural convection heat dissipation.

The invention has the beneficial effects that:

1. the invention simplifies the key structure of signal simulation, and is directly connected with the navigation radar for the ship to be tested, thereby facilitating the test and improving the test efficiency;

2. the rechargeable storage battery is arranged, the test is not limited by environmental conditions, and the influence of the terrain environment and clutter on test data can be reduced;

3. conventional equipment such as an antenna and the like is not needed, and the operation is simpler and more convenient;

4. transmitting a simulated response signal to a radar system, and adjusting a knob of an adjustable attenuator to enable a response target to be stably and clearly displayed on a radar screen and enable a character column to display a corresponding character at the moment;

5. a power supply protection switch and a current and 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 an exploded view of one embodiment of the present invention;

FIG. 2 is a schematic diagram of a hardware circuit configuration of a pulse signal generation board according to an embodiment of the present invention;

FIG. 3 is a logic block diagram of a pulse signal generating board according to an embodiment of the present invention;

fig. 4 is an appearance diagram of coaxial waveguide transition.

In the figure: a control box base 1; a control box cover 2; a manipulation and input/output signal panel 3; a storage battery 4; a pulse signal generating board 5; a radio frequency oscillator 6; a directional coupler 7; an adjustable attenuator 8; waveguide coaxial conversion 9; a power main switch 10; a power charging socket 11; a power protection switch 12; a current-voltage monitoring table 13; an input switch 14; a video plug and socket 15; a power supply conversion section 41; a voltage 42; a trigger signal 51; a bow signal 52; the orientation signal 53; a level shift circuit and filter circuit block 54; an encoding input 55; a buffer isolation circuit 56; an FPGA master control core 57; a drive circuit module 58; and a dispensing pulse output module 59.

Detailed Description

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

Example (b): a novel response signal simulator comprises a control box base 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 base 1, a pulse signal generating 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 switch 9 are sequentially arranged outside the control box, and the output end of the waveguide coaxial switch 9 is connected with a radar system to be tested; the side surface of the control box is connected with a power main switch 10 and a power charging socket 11; a power protection switch 12 connected with a power output and a current and voltage monitoring meter 13 are arranged on a panel, and referring to fig. 1, connection screws of all components are shown beside all corresponding components in fig. 1 but are not marked with codes.

The control and input-output signal panel 3 is provided with six input switches 14 for a trigger signal 51, a bow signal 52 and an azimuth signal 53, which are connected in correspondence with the pulse signal generating board 5, and four video plugs and sockets 15 for connecting the pulse signal generating board 5 in correspondence with the display.

The pulse signal generating board 5 is a PCB circuit board, and generates a six-bit pulse signal including a start bit, an end bit and a middle four-bit encoding bit by using the input trigger signal 51, the bow signal 52 and the direction signal 53 through the FPGA main control core board 57, as shown in fig. 2.

As shown in fig. 3, the pulse signal generating board 5 has a logic program diagram, in which a rechargeable battery 4 provides 24V power, a power conversion part 41 converts the power to provide +5V, +3.3V, +2.5V, +1.8V and-12V 42 to the relevant components of the pulse signal generating board 5, and the input switches 14 of a trigger signal 51, a bow signal 52 and an azimuth signal 53 transmit the signals to a level conversion circuit and a filter circuit module 54, and then transmit the signals together with a code input 55 to an FPGA main control core board 57 through a buffer isolation circuit 56, and finally transmit the signals to a dispensing pulse output module 59 through a driving circuit module 58.

The rechargeable battery 4 is a lithium battery for supplying a voltage of 24V required for the operation of the pulse signal generating board 5 and energy required for the continuous operation of the simulator.

And the radio frequency oscillator 6 is used for modulating the six-bit pulse signal to generate a radio frequency signal and a modulation signal.

And 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 to be tested, and outputting the signal to the adjustable attenuator 8.

And the adjustable attenuator 8 is used for providing an adjustable attenuation range, overlapping the isolated modulation signal and outputting the signal to the waveguide coaxial switch 9.

And the waveguide coaxial conversion 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 to be tested. 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 strength of the output signal, and whether the sensitivity of receiving the response signal of the radar system and the helicopter character decoding function are normal or not 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 knob of the adjustable attenuator 8 is adjusted, so that the response target can be stably and clearly displayed on the radar screen, and the character column displays the corresponding character at the moment.

For example: the dial switch of the characters on the simulator control box selects '1111', so a simulated target can be displayed on the screen of the radar system, and the character bar displays 'H15'; at the moment, the adjustable attenuator 8 is adjusted to increase attenuation, so that the echo intensity of the simulated target on the radar screen is gradually weakened, the critical position where the target can be just displayed and the character bar can read out the correct character is found, and the scale value los on the adjustable attenuator 8 at the moment is recorded₂Calculating the sensitivity of the radar to receive the response signal according to the following formula:

X＝P₁-Loss₁-Loss₂

P₁output power, los, for transmission of the RF oscillator 6₁Is a fixed attenuation value of the directional coupler 7.

The technical method provided by the invention can effectively detect the sensitivity of the ship navigation radar for receiving the response signal of the helicopter without external power supply, and verify whether the detected radar can correctly decode and display the received response signal.

The main heating component comprises a power element and heat dissipation fins formed by a good heat conductor bonded with a heat conducting glue, and the heat dissipation fins are arranged along the vertical direction to facilitate natural convection heat dissipation. The simulator can work more stably and reliably due to reasonable heat dissipation design.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.