Design method of ping-pong phase-locked loop group based on portable radar dual-frequency receiver

Abstract

The present invention belongs to the technical field of phased array radar, and specifically relates to a design method for a ping-pong phase-locked loop group based on a portable radar dual-frequency receiver. The present invention first establishes a dual-frequency system control circuit based on up-and-down frequency conversion in a frequency synthesis receiver, and then establishes two groups of ping-pong phase-locked loop groups in the up-conversion local oscillator phase-locked loop group, and transmits the up-conversion local oscillator signal obtained in the ping-pong phase-locked loop group to a microwave component for subsequent time-division multiplexing processing. The design method of the ping-pong phase-locked loop group of the dual-frequency receiver described in the present invention adopts two groups of ping-pong phase-locked loops to realize the frequency division control of the signal, and outputs a doubled up-conversion local oscillator signal as a receiving local oscillator signal and a transmitting excitation signal respectively. The phase loop groups are switched at a specified time interval. Compared with the traditional implementation method of the phase loop group, it has the advantages of small size, low power consumption, and high timeliness.

Description

Technical Field

[0001] The invention belongs to the technical field of phased array radars, and its IPC classification number is G01S13 / 02. The invention specifically relates to a design method of a ping-pong phase-locked loop group based on a portable radar dual-frequency receiver. Background Art

[0002] At present, radar technology is widely used in my country. Traditional radar devices usually use mechanical radar to monitor and scan objects. However, mechanical radar needs to be used with the help of antennas, rotating tables and other devices to perform the overall detection of signal waves. It has the problems of low detection accuracy, great influence of inertia and low scanning rate. In response to this situation, phased array radar came into being.

[0003] Patent CN202110469968X provides a high-integration two-dimensional phased array radar RF front end. This patent mainly replaces the integrated control of traditional chips with highly integrated silicon-based microwave TR chips, thereby implementing multi-channel TR, with low production costs and modular control of each function, which can be debugged separately.

[0004] Patent CN201911312249 provides an automatic gain control system and method for an active phase-scan ground reconnaissance radar. This patent establishes an array antenna and a TR processing unit so that the beams scanning in different directions can be adaptively adjusted in gain according to the echo power, which alleviates the problem of echo attenuation to a certain extent and improves the detection performance of the phased array radar.

[0005] However, the above patents usually adopt a separate design, in which the core component, the frequency synthesizer receiver, will have various fault problems due to long-term use or firmware aging, resulting in beam scanning deviation, antenna index deterioration, phase matching and other problems, affecting the reliability of the frequency synthesizer receiver. Therefore, it is urgent to introduce a design method based on a ping-pong phase-locked loop group of a portable radar dual-frequency receiver to better deal with such problems. Summary of the invention

[0006] In view of the above-mentioned problems, the present invention provides a design method for a ping-pong phase-locked loop group based on a portable radar dual-frequency receiver. First, a dual-frequency system control circuit based on up and down conversion is established in the frequency synthesis receiver, and then two groups of ping-pong phase-locked loop groups are established in the up-conversion local oscillator phase-locked loop group, and the up-conversion local oscillator signal obtained in the ping-pong phase-locked loop group is transmitted to the microwave component for subsequent time-division multiplexing processing.

[0007] Preferably, the frequency synthesis receiver sends the crystal oscillator signal to the DDS clock generation phase-locked loop and the up-conversion local oscillator phase-locked loop group respectively through a power division circuit.

[0008] Specifically, it is used to realize the simultaneous operation and conversion of two excitation signals, thereby improving the overall working efficiency of the circuit system.

[0009] Preferably, the crystal oscillator signal uses an 80HZ crystal oscillator.

[0010] Specifically, by setting the crystal oscillator frequency and specifying the corresponding crystal oscillator time under the corresponding crystal oscillator frequency in the timer, a fixed crystal oscillator signal is output.

[0011] Preferably, the ping-pong phase-locked loop group control circuits established in the up-conversion local oscillator phase-locked loop group are completely identical.

[0012] Preferably, the ping-pong phase-locked loop group includes a loop filter, a VCO voltage-controlled oscillator, and a pre-divider.

[0013] Preferably, the ping-pong phase-locked loop group outputs a doubled frequency up-converted local oscillator signal f through a ping-pong switch. L02 , and up-convert the local oscillator signal f L02 Transfer to microwave assembly.

[0014] Preferably, the operating frequency point Fre of the dual-frequency switching of the two ping-pong phase-locked loop groups is num and the frequency hopping interval Δ B The relationship is as follows, where T1 is the switching time and the signal frequency range is f L02L ~f Lo2H , the operating frequency bandwidth B of the doubled up-converted local oscillator signal Wrok .

[0015] B Work =f Lo2H -f Lo2L

[0016] f Lo2 =f Lo2L +Fre num ×Δ B

[0017] Preferably, the up-converted local oscillator signal f L02 After the microwave component power division, one channel is connected to the f containing the excitation waveform IF The signal is up-converted to generate the transmission excitation signal f SF_L ~f SF_h , the other way is connected to the input f L01 The signal is up-converted to generate the receiving local oscillator signal f R_Lo .

[0018] Preferably, the receiving local oscillator signal and the transmitting excitation signal are time-division multiplexed under the control of the transceiver pulse via the transceiver switch.

[0019] Preferably, the time-division multiplexing amplifies the received pulse signal and outputs it, and simultaneously couples it to a local oscillator input for a frequency synthesizer receiver.

[0020] Specifically, the time-division multiplexing performs processing in different time periods after receiving the same excitation signal, thereby realizing a parallel processing mode of the signal and improving the processing efficiency of the signal. At the same time, the overall control method is relatively simple and easy to promote and use.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The design method of the dual-frequency receiver ping-pong phase-locked loop group described in the present invention adopts two groups of ping-pong phase-locked loops to realize the frequency division control of the signal, and outputs a doubled frequency up-converted local oscillator signal as the receiving local oscillator signal and the transmitting excitation signal respectively. The phase loop groups are switched at specified time intervals. Compared with the traditional implementation method of the phase loop group, the dual-frequency receiver ping-pong phase-locked loop group described in the present invention improves the overall working efficiency of the frequency synthesis receiver, and adopts an integrated control design mode, which has the advantages of small size, low power consumption and high timeliness. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the principle block diagram of the ping-pong phase-locked loop group. DETAILED DESCRIPTION

[0024] Example:

[0025] This example provides a design method for a ping-pong phase-locked loop group based on a portable radar dual-frequency receiver. First, a dual-frequency system control circuit based on up and down conversion is established in the frequency synthesis receiver. Then, two groups of ping-pong phase-locked loop groups are established in the up-conversion local oscillator phase-locked loop group, and the up-conversion local oscillator signal obtained in the ping-pong phase-locked loop group is transmitted to the microwave component for subsequent time-division multiplexing processing.

[0026] Among them, Figure 1 As shown, the working principle of the dual-frequency receiver ping-pong phase-locked loop group described in the present invention is: in order to better achieve phase stability output and phase synchronization, the vibration frequency is first received and output as a stable DC signal through a loop filter, and then the VCO voltage-controlled oscillator receives the DC signal and oscillates freely according to its internal voltage conversion frequency, and then the division ratio is established through the pre-divider, and the output frequency is calculated and output through the frequency.

[0027] The loop filter averages the collected ripple signal to provide stability of the signal input of the phase-locked loop circuit. The VCO voltage-controlled oscillator obtains the DC signal in the loop filter and adjusts the oscillation frequency of the voltage control signal. The pre-divider adjusts the output frequency interval in the oscillation frequency of the signal by setting the specified frequency division parameters, and generates a stable output frequency by establishing a feedback control model.

[0028] The relationship between the receiving local oscillator signal and the transmitting excitation signal is as follows:

[0029] f SF_L =f Lo2L +f IF

[0030] f SF_H =f Lo2H +f IF

[0031] f R_Lo =f Lo2 +f Lo1 .

Claims

1. A design method for a ping-pong phase-locked loop group based on a portable radar dual-frequency receiver, characterized in that: Firstly, a dual-frequency system control circuit based on up-down conversion is established in the frequency synthesizer receiver, and then two ping-pong phase-locked loop groups are established in the up-conversion local oscillator phase-locked loop group, and the up-conversion local oscillator signal obtained in the ping-pong phase-locked loop group is transmitted to the microwave component for subsequent time-division multiplexing processing; The ping-pong phase-locked loop group includes a loop filter, a VCO voltage-controlled oscillator, and a pre-frequency divider; The ping-pong phase-locked loop group outputs a doubled frequency up-converted local oscillator signal through a ping-pong switch. , and up-convert the local oscillator signal Transmitted to microwave assembly; The loop filter averages the collected ripple signal, the VCO voltage-controlled oscillator obtains the DC signal in the loop filter and adjusts the oscillation frequency of the voltage control signal, the pre-divider adjusts the output frequency interval in the oscillation frequency of the signal by setting the specified frequency division parameter, and generates a stable output frequency by establishing a feedback control model; The operating frequency points of the dual-frequency switching of the two ping-pong phase-locked loop groups and frequency hopping interval The relationship is as follows: （1） （2） in is the switching time, and the signal frequency range is , the operating frequency bandwidth of the doubled up-converted local oscillator signal .

2. The design method of a ping-pong phase-locked loop group based on a portable radar dual-frequency receiver according to claim 1 is characterized in that: The frequency synthesis receiver sends the crystal oscillator signal to the DDS clock generation phase-locked loop and the up-conversion local oscillator phase-locked loop group through the power division circuit.

3. The design method of a ping-pong phase-locked loop group based on a portable radar dual-frequency receiver according to claim 2 is characterized in that: The crystal oscillator signal adopts 80HZ crystal oscillator.

4. The method for designing a ping-pong phase-locked loop group based on a portable radar dual-frequency receiver according to claim 3 is characterized in that: The ping-pong phase-locked loop group control circuits established in the up-conversion local oscillator phase-locked loop group are completely the same.

5. The design method of a ping-pong phase-locked loop group based on a portable radar dual-frequency receiver according to claim 1 is characterized in that: The up-converted local oscillator signal After the microwave component power is divided, one channel is connected to the excitation waveform Signal up-conversion generates transmit excitation signal , the other way with the input Signal up-conversion generates receiving local oscillator signal .

6. The method for designing a ping-pong phase-locked loop group based on a portable radar dual-frequency receiver according to claim 5, characterized in that: The receiving local oscillator signal and the transmitting excitation signal are time-division multiplexed under the control of the receiving and transmitting pulses through the receiving and transmitting switch.

7. A design method for a ping-pong phase-locked loop group based on a portable radar dual-frequency receiver according to claim 1 or 6, characterized in that: The time-division multiplexing amplifies the received pulse signal and outputs it, and at the same time couples it to a local oscillator input for a frequency synthesizer receiver.

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