A radar maintenance microwave signal source

Abstract

The utility model relates to a kind of radar overhauls microwave signal source, and the signal source includes: phase-locked loop chip;Single-chip microcontroller is connected by analog SPI interface and phase-locked loop chip, and single-chip microcontroller is also equipped with 32.768KHz crystal oscillator input port, 8MHz crystal oscillator input port, SWD program download interface and single-chip microcomputer serial port;Touch screen, touch screen is connected with single-chip microcomputer serial port by TTL serial port, and touch screen is used to control the parameter of single-chip microcomputer input signal;Power supply, phase-locked loop chip, single-chip microcontroller and touch screen are electrically connected with power supply respectively.This embodiment utilizes the parameter of frequency signal input by touch screen control single-chip microcomputer, then after single-chip microcomputer and touch screen processing, the local oscillator signal for radar receiver and the excitation signal of radar transmitter can be obtained, to provide test condition for the overhauls of radar transmitter and receiver;The signal source of the utility model has the advantages of high integration, small size, full function and simple operation, and is convenient for carrying during field operation.

Description

Technical Field

[0001] This utility model relates to the field of signal source technology, and in particular to a microwave signal source for radar maintenance. Background Technology

[0002] The radar transmitter and receiver are crucial components of a radar system. The transmitter amplifies the excitation radio frequency signal according to instructions from the main control computer, while the receiver converts the high-frequency signal to an intermediate frequency (IF) for preliminary processing. Because radar operates at relatively high frequencies, it requires appropriate signal sources to provide excitation and local oscillator signals. In radar systems, frequency synthesizers can perform these functions; however, frequency synthesizers are complex in structure and cumbersome to operate, making them inconvenient during subsystem debugging and impacting maintenance efficiency.

[0003] Therefore, it is necessary to improve one or more of the problems existing in the above-mentioned related technical solutions.

[0004] It should be noted that this section is intended to provide background or context for the technical solutions of this utility model as set forth in the claims. The description herein does not constitute an admission that it is prior art simply because it is included in this section. Utility Model Content

[0005] The purpose of this invention is to provide a microwave signal source for radar maintenance, thereby overcoming, to at least to some extent, one or more problems caused by the limitations and defects of related technologies.

[0006] This utility model provides a microwave signal source for radar maintenance, including:

[0007] A phase-locked loop (PLL) chip, wherein the PLL chip is provided with a 50MHz crystal oscillator input interface, a frequency input interface, a reference clock signal output interface, and an RF output port;

[0008] The microcontroller is connected to the phase-locked loop chip via an analog SPI interface. The microcontroller also has a 32.768KHz crystal oscillator input port, an 8MHz crystal oscillator input port, an SWD program download interface, and a microcontroller serial port.

[0009] A touch screen is connected to a microcontroller's serial port via a TTL serial port, and the touch screen is used to control the parameters of the microcontroller's input signals.

[0010] The power supply, the phase-locked loop chip, the microcontroller, and the touch screen are all electrically connected to the power supply.

[0011] In this invention, the microcontroller input signal includes two modes: spot frequency and sweep frequency. The radio frequency signal output in the spot frequency mode serves as the local oscillator signal of the radar receiver, and the radio frequency signal output in the sweep frequency mode serves as the excitation signal of the radar transmitter.

[0012] In this invention, the phase-locked loop chip and the microcontroller are respectively connected to the power supply through a voltage regulator.

[0013] In this invention, the phase-locked loop chip is an LMX2592 chip.

[0014] In this utility model, the microcontroller is an STM32 series microcontroller, which includes the STM32F103C8T6 microcontroller.

[0015] In this invention, the microcontroller is equipped with an indicator light, which is used to indicate the power status, signal output status, and radio frequency signal mode.

[0016] In this invention, the microcontroller is equipped with a horn-shaped connector for SPI data transmission and power supply.

[0017] The technical solutions provided by the embodiments of this utility model may include the following beneficial effects:

[0018] This invention discloses a microwave signal source for radar maintenance. It utilizes a touchscreen to control the parameters of the frequency signal input to the microcontroller. After processing by the microcontroller and touchscreen, the signal yields the local oscillator signal for the radar receiver and the excitation signal for the radar transmitter, providing testing conditions for the maintenance of the radar transmitter and receiver. This signal source boasts advantages such as high integration, small size, comprehensive functions, and simple operation, making it easy to carry during field operations. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments conforming to the present invention and, together with the description, serve to explain the principles of the present invention. It is obvious that the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0020] Figure 1 The diagram shows the structural block diagram of the microwave signal source for radar maintenance in this utility model. Detailed Implementation

[0021] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0022] Furthermore, the accompanying drawings are merely illustrative of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0023] This example implementation provides a microwave signal source for radar maintenance. Please refer to [link / reference]. Figure 1 The signal source includes: phase-locked loop chip 100, microcontroller 200, touch screen 300 and power supply.

[0024] Specifically, the phase-locked loop chip 100 is provided with a 50MHz crystal oscillator input interface, a frequency input interface, a reference clock signal output interface, and an RF output port.

[0025] The microcontroller 200 is connected to the phase-locked loop chip 100 through an analog SPI interface. The microcontroller 200 is also equipped with a 32.768KHz crystal oscillator input port, an 8MHz crystal oscillator input port, an SWD program download interface, and a microcontroller serial port.

[0026] The touch screen 300 is connected to the microcontroller's serial port via a TTL serial port, and the touch screen 300 is used to control the parameters of the input signals of the microcontroller 200.

[0027] The phase-locked loop chip 100, the microcontroller 200, and the touch screen 300 are respectively electrically connected to the power supply.

[0028] In this embodiment, the touch screen 300 is used to control the parameters of the frequency signal input to the microcontroller 200. After processing by the microcontroller 200 and the touch screen 300, the local oscillator signal for the radar receiver and the excitation signal for the radar transmitter can be obtained, providing test conditions for the maintenance of the radar transmitter and receiver. Compared with the frequency synthesizer, the signal source of this utility model has the advantages of high integration, small size, full functionality and simple operation, and is easy to carry when working in the field.

[0029] The following describes the structure of each part of the signal source in the above embodiments and its specific working process.

[0030] 1. Power supply

[0031] The signal source in this invention has two USB ports. One USB port is used to charge the signal source's battery, which in turn powers other components of the signal source. The other USB port is used to directly power the signal source. The power supply can be selected via the connected USB port to power either the signal source via battery or direct power. A single-pole three-throw switch can be used for switching during operation.

[0032] The power supply provides 5V, which can be stably output as 3.3V through the low-dropout three-terminal regulator CJA1117B-3.3V and RT9193 to power the phase-locked loop chip 100 and the microcontroller 200; while the touch screen 300 directly uses the 5V provided by the power supply.

[0033] 2. Communication Control Section

[0034] The core of the communication control section is the microcontroller 200, which can be an STM32 series microcontroller, such as the STM32F103C8T6. Optionally, the microcontroller 200 can be mounted on the control board. The microcontroller 200 receives commands from the touchscreen 300 via a serial port and reports the execution results. After being parsed by the microcontroller 200, the commands are sent to the phase-locked loop chip 100 via the SPI interface. The microcontroller 200's P... C14 and P C15 The port is connected to a 32.768kHz crystal oscillator, P D0 and P D1 The port is connected to an 8MHz crystal oscillator. A9 and P A10 Multiplexed as a serial port. P A0 P C13 NRST is used as a switch. P A1 / P A2 / P A3 For indicator lights. P A4 / P A5 / P A6 / P A7 / P A8 These correspond to the SPI communication ports LE / CSB / NSS, SCK / CLK, MISO / MUX, MISO / DATA, and CE of the phase-locked loop chip 100, respectively. The microcontroller 200 has a reserved SWD program download interface for program burning and debugging. It should be noted that some interfaces of the microcontroller 200 are not shown in the figure; please refer to conventional techniques in this field.

[0035] When the microcontroller 200 receives serial port command data, it first determines whether it is a frequency point operation or a frequency sweep operation according to the protocol. If it conforms to the frequency point protocol, the program parses the set frequency point and amplitude, calculates the values ​​of each register that need to be configured, and then combines them into an array and outputs them byte by byte.

[0036] When the microcontroller 200 receives data and determines it to be a frequency sweep command, it first parses the values ​​of the start and end frequencies, then parses the step value, amplitude, and frequency hopping time. After parsing, it calculates the register value of the start frequency and writes it byte by byte. Then it enters a delay program, with the delay time equal to the frequency hopping time. Next, it calculates and writes the value of the second frequency register, continuing until the register value of the last frequency is written.

[0037] 3. Radio frequency signal generation section

[0038] The radio frequency signal generation circuit of this invention is built around a phase-locked loop chip 100, such as the LMX2592, and adopts a 4-layer board design. The LMX2592 is a low-noise broadband radio frequency PLL (phase-locked loop) that supports a frequency range of 20MHz to 9.8GHz and integrates VCO phase-locked loop functionality.

[0039] The phase-locked loop (PLL) chip 100 operates on a 5V power supply and is mounted on the circuit board, where it is internally converted to 3.3V. The PLL chip 100 uses a 50MHz TCXO (temperature-compensated crystal oscillator) as its external clock. The data interface is a simple horn-type connector for SPI data and power supply. The circuit board provides either an external reference frequency input or an onboard clock output interface.

[0040] When the phase-locked loop chip 100 receives the frequency, amplitude, and sweep frequency setting data from the microcontroller 200, it sets the internal registers, performs corresponding frequency division and multiplication operations, and outputs phase-locked signal. The onboard indicator light illuminates, and RF power is output. Optionally, the indicator light can be used to indicate power status, signal output status, and RF signal mode.

[0041] The phase-locked loop chip 100 has reserved an external crystal oscillator input interface and an external reference clock signal interface. The LMX2592 chip converts the reference clock into a local oscillator signal of the required frequency through frequency division, frequency multiplication, and phase-locking technology.

[0042] 4. Touchscreen 300

[0043] The touchscreen 300 can use a 7-inch serial touchscreen 300 as its input and output display device. The serial touchscreen 300 is powered by 5V and connects to the microcontroller 200's serial port via a TTL serial port.

[0044] The touchscreen 300 uses two pages. The first page is for frequency point operation. By clicking the hotspots for frequency and amplitude, a keypad pops up. After entering the desired value, select the unit (G / M / KHz, dBm) and input the corresponding data. The second page is for frequency sweep operation. By clicking the hotspots for start frequency, end frequency, step, frequency hopping time, and amplitude, a keypad pops up. After entering the desired value, select the unit (G / M / KHz, dBm, mS) and input the corresponding data. After all the data is set, pressing the output button will output the command as a long string and return the current status data of the microcontroller 200. Accordingly, the microcontroller 200 input signals include two modes: frequency point and frequency sweep. In frequency point mode, the output radio frequency signal serves as the local oscillator signal of the radar receiver, and in frequency sweep mode, the output radio frequency signal serves as the excitation signal of the radar transmitter.

[0045] For example, in spot frequency mode, a fixed frequency (e.g., 9.6 GHz) is output as the local oscillator signal of the radar receiver to test the mixer performance; in sweep frequency mode, the frequency is swept in steps from 1 GHz to 2 GHz to test the bandwidth and gain flatness of the transmitter power amplifier.

[0046] The touch screen 300 controls the signals input to the microcontroller 200 by setting corresponding software programs.

[0047] The process of using the signal source of this invention for radar maintenance is as follows:

[0048] 1. Connect the output ports OUTA and OUTB of the phase-locked loop chip 100 in the signal source to the excitation input port of the radar transmitter or the local oscillator input port of the receiver;

[0049] 2. Start the signal source;

[0050] 3. Select the frequency mode via the touchscreen 300, input the frequency and amplitude values, and then output;

[0051] 4. Select the frequency sweep mode via the touchscreen 300, input the start frequency, end frequency, step value, frequency hopping interval time, and amplitude, and then output the result;

[0052] 5. Turn off the signal source after maintenance is completed.

[0053] In summary, the microwave signal source for radar maintenance proposed in this utility model can provide the high-frequency signal required for radar maintenance, solve the problem of shortage of field testing instruments, realize rapid maintenance, and improve field maintenance efficiency; it has a high degree of automation, and the software interface can be set to be simple and easy to operate; it realizes the combination of radio frequency control technology hardware and software; it is small in size, lightweight, and convenient for technicians to carry during field support.

[0054] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A microwave signal source for radar maintenance, characterized in that, include: A phase-locked loop (PLL) chip, wherein the PLL chip is provided with a 50MHz crystal oscillator input interface, a frequency input interface, a reference clock signal output interface, and an RF output port; The microcontroller is connected to the phase-locked loop chip via an analog SPI interface. The microcontroller also has a 32.768KHz crystal oscillator input port, an 8MHz crystal oscillator input port, an SWD program download interface, and a microcontroller serial port. A touch screen is connected to a microcontroller's serial port via a TTL serial port, and the touch screen is used to control the parameters of the microcontroller's input signals. The power supply, the phase-locked loop chip, the microcontroller, and the touch screen are all electrically connected to the power supply.

2. The radar maintenance microwave signal source according to claim 1, characterized in that, The microcontroller input signal includes two modes: spot frequency and sweep frequency. In spot frequency mode, the output radio frequency signal is used as the local oscillator signal of the radar receiver, and in sweep frequency mode, the output radio frequency signal is used as the excitation signal of the radar transmitter.

3. The radar maintenance microwave signal source according to claim 1, characterized in that, The phase-locked loop chip and the microcontroller are respectively connected to the power supply through a voltage regulator.

4. The radar maintenance microwave signal source according to claim 1, characterized in that, The phase-locked loop chip used is the LMX2592 chip.

5. The radar maintenance microwave signal source according to claim 1, characterized in that, The microcontroller used is an STM32 series microcontroller, which includes the STM32F103C8T6 microcontroller.

6. The radar maintenance microwave signal source according to claim 1, characterized in that, The microcontroller is equipped with indicator lights, which are used to indicate the power status, signal output status, and radio frequency signal mode.

7. The radar maintenance microwave signal source according to any one of claims 1 to 6, characterized in that, The microcontroller is equipped with a horn-shaped connector for SPI data transmission and power supply.

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