Multipath effect radio frequency simulation system

Abstract

The application provides a multi-path effect radio frequency simulation system, comprising: an input end of a phase shifter is connected with a target simulation unit, and an output end of the phase shifter is connected with a radio frequency simulation feed unit; a first end of a phase control computer is connected with the phase shifter, and a second end of the phase control computer is connected with a simulation control unit; the simulation control unit obtains a phase offset of a multi-path microwave signal according to a relative position and a motion attitude of an aircraft and a target; the phase control computer obtains a control word of the corresponding phase shifter according to the phase offset, controls the phase shifter to perform phase offset on the microwave signal input by the target simulation unit according to the control word; and the phase shifter inputs the microwave signal after phase offset to the radio frequency simulation feed unit. Compared with the prior art, the application realizes high-precision phase control of the microwave signal at a lower cost by adding the phase shifter between the target simulation unit and the feed unit.

Description

Technical Field

[0001] This invention relates to the field of simulation technology, and more specifically, to a multipath effect radio frequency simulation system. Background Technology

[0002] A hardware-in-the-loop (HIL) simulation system is a system that simulates target signals in a laboratory and analyzes and verifies the guidance and control system. HIL simulation systems play an indispensable role in reducing R&D costs, shortening development cycles, and improving R&D capabilities.

[0003] The hardware-in-the-loop simulation test system mainly consists of a reflective memory network, a simulation control system, a turntable system, a power supply system, and a target simulation system. Multipath propagation is a common phenomenon in microwave signal transmission, and the multipath effect causes changes in the phase of the microwave signal.

[0004] In current hardware-in-the-loop simulation systems, there is a lack of phase control devices specifically designed for multipath effect simulation in microwave transmission links, and upgrading the target simulation system to achieve this function would be too costly.

[0005] Patent document CN104459641A discloses a microwave environment interference signal simulation system, which includes a radar interference signal simulator, a multipath interference signal simulator, a switch, and a computer control platform. The radar interference signal simulator and the multipath interference signal simulator are connected to the switch via network cables, and the switch is connected to the computer control platform via a single network cable. However, this method still cannot solve the phase control problem in multipath effect simulation. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of this invention is to provide a multipath effect radio frequency simulation system.

[0007] According to the present invention, a multipath effect radio frequency simulation system is provided, comprising: a radio frequency simulation feed unit, a phase shifter, a target simulation unit, a phase control computer, and a simulation control unit;

[0008] The input terminal of the phase shifter is connected to the target simulation unit, and the output terminal of the phase shifter is connected to the RF simulation feed unit; the first terminal of the phase control computer is connected to the phase shifter, and the second terminal of the phase control computer is connected to the simulation control unit.

[0009] The simulation control unit obtains the phase offset of the multipath microwave signal based on the relative position and motion attitude of the aircraft and the target; the phase control computer obtains the corresponding control word of the phase shifter based on the phase offset, and controls the phase shifter to perform phase shifting on the microwave signal input from the target simulation unit according to the control word; the phase shifter inputs the phase-shifted microwave signal into the RF simulation feed unit.

[0010] Preferably, the phase shifter is connected to the target simulation unit and the RF simulation feed unit via a cable.

[0011] Preferably, the cable includes radio frequency cable and microwave cable.

[0012] Preferably, the phase control computer is connected to the simulation control unit via optical fiber.

[0013] Preferably, the phase control computer is connected to the phase shifter via a control cable.

[0014] Preferably, the control terminal of the phase shifter is connected to the I / O control card of the phase control computer via a control cable.

[0015] Preferably, the simulation control unit obtains the phase offset of the multipath microwave signal based on the relative position and motion attitude of the aircraft and the target, and writes the phase offset to the corresponding address according to the communication protocol.

[0016] Preferably, the phase control computer receives the phase offset of the multipath microwave signal obtained by the simulation control unit according to the communication protocol, obtains the corresponding control word of the phase shifter according to the phase offset, and sends the control signal corresponding to the control word to the phase shifter through the IO control card.

[0017] Preferably, a reflective memory card is installed in the phase control computer.

[0018] Preferably, the simulation control unit sends the phase offset to the phase control computer through the reflective memory network where the reflective memory card is located.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention adds a phase shifter between the target analog unit and the power supply unit to achieve high-precision phase control of microwave signals at a lower cost.

[0021] 2. This invention uses a phase control computer to obtain the control word corresponding to the phase shifter based on the phase offset of the simulation control unit, thereby realizing phase control of the target simulation unit. Attached Figure Description

[0022] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a flowchart illustrating the phase control computer of the present invention. Detailed Implementation

[0025] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0026] Figure 1 This is a schematic diagram of the structure of the present invention, as shown below. Figure 1 As shown, the present invention provides a multipath effect radio frequency simulation system, including: a radio frequency simulation feed unit, a phase shifter, a target simulation unit, a phase control computer, and a simulation control unit.

[0027] The input terminal of the phase shifter is connected to the target simulation unit, and the output terminal of the phase shifter is connected to the radio frequency simulation power supply unit; the first terminal of the phase control computer is connected to the phase shifter, and the second terminal of the phase control computer is connected to the simulation control unit.

[0028] Specifically, the simulation control unit obtains the phase offset of the multipath microwave signal based on the relative position and motion attitude of the aircraft and the target; the phase control computer obtains the corresponding control word of the phase shifter based on the phase offset, and controls the phase shifter to perform phase shifting on the microwave signal input from the target simulation unit according to the control word; the phase shifter inputs the phase-shifted microwave signal into the radio frequency simulation feed unit.

[0029] Preferably, the phase shifter is connected to the target simulation unit and the radio frequency simulation feed unit via cables; the cables include radio frequency cables and microwave cables; the phase control computer is connected to the simulation control unit via optical fiber; the phase control computer is connected to the phase shifter via a control cable.

[0030] Specifically, the signal input terminal of the phase shifter is connected to the output terminal of the target simulation unit via an RF cable, and the signal output terminal of the phase shifter is connected to the input terminal of the RF simulation power supply unit via an RF cable, so that the output signal of the target simulation unit can be correctly input to the RF simulation power supply unit through the phase shifter.

[0031] Furthermore, the phase control computer is connected to the simulation control unit via optical fiber, enabling the phase control computer to receive the phase offset of the multipath microwave signal calculated by the simulation control unit. The phase shifter control terminal is connected to the I / O control card of the phase control computer via a control cable, allowing the phase control computer to control the phase shifter.

[0032] In this invention, the phase shifter can be a digitally controlled phase modulator.

[0033] In one optional implementation, firstly, a digitally controlled phase modulator is installed at the input end of the RF simulation feed unit to complete the RF simulation microwave link connection; then, the phase control computer is networked with the reflection memory of the simulation control unit, and the control cable of the phase control computer is connected to the digitally controlled phase modulator.

[0034] Specifically, after the simulation begins, the simulation control unit calculates the phase offset of the multipath microwave signal based on the relative position and motion attitude of the aircraft and the target; the phase control software in the phase control computer calculates the corresponding control word of the numerically controlled phase modulator based on the phase offset, and controls the phase modulator to achieve the offset of a specific phase of the microwave signal.

[0035] The type of target is not limited in this invention; for example, it can be an aircraft, a missile, etc.

[0036] Specifically, the target will affect the phase of the microwave signal. During the propagation process, the microwave signal is reflected by some target objects, which changes the propagation direction, amplitude, polarization and phase of the microwave signal.

[0037] Specifically, the phase control computer calculates the corresponding control word for the numerically controlled phase modulator based on the phase offset, and controls the phase modulator via a control cable to achieve a specific phase offset of the microwave signal. This invention can be used to simulate multipath effects in radio frequency simulations.

[0038] The control terminal of the phase shifter is connected to the I / O control card of the phase control computer via a control cable.

[0039] Specifically, the simulation control unit obtains the phase offset of the multipath microwave signal based on the relative position and motion attitude of the aircraft and the target, and writes the phase offset to the corresponding address according to the communication protocol.

[0040] In one optional implementation, after the simulation is started, the simulation control unit calculates the phase offset of the multipath microwave signal based on the relative position and motion attitude of the aircraft and the target, and writes the phase offset to the corresponding address according to the communication protocol.

[0041] Furthermore, the phase control computer receives the phase offset of the multipath microwave signal obtained by the simulation control unit according to the communication protocol, obtains the corresponding control word of the phase shifter based on the phase offset, and sends the control signal corresponding to the control word to the phase shifter through the IO control card.

[0042] In this invention, a reflective memory card is installed in the phase control computer.

[0043] Preferably, the simulation control unit sends the phase offset to the phase control computer through the reflective memory network where the reflective memory card is located.

[0044] Specifically, the phase control computer receives the phase offset of the multipath microwave signal calculated by the simulation control unit through the reflective memory network according to the communication protocol, calculates the control word of the corresponding phase shifter based on the phase offset, and sends the control signal to the phase shifter through the IO control card to realize the control of a specific phase of the microwave signal.

[0045] Example 1

[0046] First, connect the microwave signal input terminal of the phase shifter to the signal output terminal of the target simulation unit via an RF cable, and connect the microwave signal output terminal of the phase shifter to the signal input terminal of the RF simulation feed unit via an RF cable. Then, install the reflection memory card and IO control card in the phase control computer. After that, connect the reflection memory card of the phase control computer to the reflection memory network of the simulation control unit via an optical fiber, and connect the IO control card of the phase control computer to the control terminal of the phase shifter via a control cable.

[0047] Run the simulation software to start the simulation process. The simulation control unit calculates the phase offset of the multipath microwave signal based on the relative position and motion attitude of the aircraft and the target, and transmits the offset to the phase control computer through the reflective memory network according to the communication protocol. The phase control software on the phase control computer calculates the phase modulator control word corresponding to the received phase offset, and sends the control signal to the numerically controlled phase modulator through the IO control card.

[0048] In Example 1, the microwave signal input and output ports of the phase shifter are connected to the target simulation unit and the RF simulation feed unit respectively via microwave cables, so that the microwave signal can correctly reach the RF simulation feed unit through the phase shifter; a reflective memory card and an IO control card are installed in the phase control computer, and the drivers for the reflective memory card and the IO control card are installed to enable the reflective memory card and the IO control card to work normally; the phase shifter is connected to the IO control card via a control cable; all relevant simulation software and hardware are run to start the simulation process.

[0049] In Embodiment 1, the simulation control unit calculates the phase offset of the signal generated when the target echo signal reaches the aircraft's signal receiver via multiple paths, based on information such as the aircraft's and target's position, altitude, and attitude angles. This phase offset is then sent to the phase control computer via a reflection memory network. The phase control software determines the control word for the corresponding phase shifter by looking up a table, and then sends this control word to the phase shifter via the I / O control card interface function, thereby controlling a specific phase of the microwave signal.

[0050] Figure 2 This is a flowchart illustrating the phase control computer of the present invention, as shown below. Figure 2As shown, the process includes the following steps: After the simulation program runs, step S101 begins: waiting for an interrupt from the reflective memory card, where an interrupt from the reflective memory card indicates that a simulation command has been received; then step S102 is executed: determining whether an interrupt has been received. If not, step S101 is executed; if yes, step S103 is executed: reading the phase offset; after step S103, step S104 is executed: calculating the corresponding phase shifter control word, i.e., the phase control word, based on the phase offset; then step S105 is executed: sending a control signal to the phase shifter through the IO control card to control a specific phase of the microwave signal; finally, step S106 is executed: determining whether to end the program. If yes, the simulation program exits; otherwise, step S101 is executed.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] 1. The present invention adds a phase shifter between the target analog unit and the power supply unit to achieve high-precision phase control of microwave signals at a lower cost.

[0053] 2. This invention uses a phase control computer to obtain the control word corresponding to the phase shifter based on the phase offset of the simulation control unit, thereby realizing phase control of the target simulation unit.

[0054] Those skilled in the art will understand that, in addition to implementing the system, apparatus, and their modules provided by this invention in purely computer-readable program code, the same program can be implemented in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, the system, apparatus, and their modules provided by this invention can be considered a hardware component, and the modules included therein for implementing various programs can also be considered structures within the hardware component; alternatively, modules for implementing various functions can be considered both software programs implementing the method and structures within the hardware component.

[0055] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A multipath effect radio frequency simulation system, characterized in that, The system includes: a radio frequency simulation feed unit, a phase shifter, a target simulation unit, a phase control computer, and a simulation control unit; The input terminal of the phase shifter is connected to the target simulation unit, and the output terminal of the phase shifter is connected to the RF simulation feed unit; the first terminal of the phase control computer is connected to the phase shifter, and the second terminal of the phase control computer is connected to the simulation control unit. The simulation control unit obtains the phase offset of the multipath microwave signal based on the relative position and motion attitude of the aircraft and the target, and writes the phase offset to the corresponding address according to the communication protocol; the phase control computer obtains the control word of the corresponding phase shifter based on the phase offset, and controls the phase shifter to perform phase shifting on the microwave signal input from the target simulation unit according to the control word; the phase shifter inputs the phase-shifted microwave signal into the RF simulation feed unit; The phase control computer is connected to the phase shifter via a control cable.

2. The multipath effect radio frequency simulation system according to claim 1, characterized in that, The phase shifter is connected to the target simulation unit and the RF simulation feed unit via cables.

3. The multipath effect radio frequency simulation system according to claim 2, characterized in that, The cables include radio frequency cables and microwave cables.

4. The multipath effect radio frequency simulation system according to claim 1, characterized in that, The phase control computer is connected to the simulation control unit via optical fiber.

5. The multipath effect radio frequency simulation system according to claim 1, characterized in that, The control terminal of the phase shifter is connected to the I / O control card of the phase control computer via a control cable.

6. The multipath effect radio frequency simulation system according to any one of claims 1-5, characterized in that, The phase control computer receives the phase offset of the multipath microwave signal obtained by the simulation control unit according to the communication protocol, obtains the corresponding control word of the phase shifter based on the phase offset, and sends the control signal corresponding to the control word to the phase shifter through the IO control card.

7. The multipath effect radio frequency simulation system according to claim 6, characterized in that, A reflection memory card is set in the phase control computer.

8. The multipath effect radio frequency simulation system according to claim 7, characterized in that, The simulation control unit sends the phase offset to the phase control computer through the reflective memory network where the reflective memory card is located.

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