CN-122017763-A - Adaptive power adjustment method of radar echo simulation system and related equipment

CN122017763ACN 122017763 ACN122017763 ACN 122017763ACN-122017763-A

Abstract

The invention provides a self-adaptive power adjusting method and related equipment of a radar echo simulation system, which comprise the steps of obtaining scene parameters of a test scene and radar pulse input signals, calculating theoretical expected echo power of the radar pulse input signals in the test scene in real time, obtaining current pulse signals of the radar pulse input signals in a digital baseband domain and instantaneous amplitude values of the current pulse signals, calling a receiving-transmitting link gain model, predicting inherent radio frequency output power without additional attenuation or gain adjustment in a feedforward mode according to the instantaneous amplitude values, calculating a transmitting link power adjusting parameter according to power difference between the theoretical expected echo power and the inherent radio frequency output power in combination with a target, and adjusting the amplitude of the current pulse signals according to the power adjusting parameter in the digital domain to generate and output radio frequency echo signals. The method and the device can improve the power control precision and the instantaneity of radar echo simulation.

Inventors

ZHANG HUARUI
WANG MENG
LU SHANGHUA
LIU YANG

Assignees

湖南艾科诺维科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260316

Claims (10)

1. A method for adaptive power regulation of a radar echo simulation system, comprising: acquiring scene parameters of a test scene, and receiving radar pulse input signals input into a radar echo simulation system; calculating theoretical expected echo power of the radar pulse input signal in the test scene in real time according to a radar equation and the scene parameters; Sampling and analog-to-digital converting the radar pulse input signal in real time to obtain a current pulse signal of the radar pulse input signal in a digital baseband domain and an instantaneous amplitude value of the current pulse signal; The method comprises the steps of calling a pre-built receiving-transmitting link gain model, and according to the instantaneous amplitude value, feedforward predicting the inherent radio frequency output power of the radar echo simulation system when no additional attenuation or gain adjustment is applied, wherein the receiving-transmitting link gain model is built based on offline test data and represents the mapping relation between the digital domain input power obtained by analog conversion acquisition of the radar echo simulation system in a linear working area and the whole machine radio frequency output power; calculating a transmitting link power regulation parameter according to the power difference between the theoretical expected echo power and the inherent radio frequency output power by combining with a target; and adjusting the amplitude of the current pulse signal in the digital domain according to the power adjustment parameter so as to generate and output a radio frequency echo signal.
2. The method for adaptive power adjustment of a radar echo simulation system according to claim 1, wherein the process of constructing the transceiver link gain model includes: respectively connecting a standard signal source and power measurement equipment to a radio frequency input port and a radio frequency output port of the radar echo simulation system; Controlling a standard signal source to output single-frequency continuous waves covering the working frequency band of the radar echo simulation system, and adjusting the input power level to ensure that active devices in a receiving link of the radar echo simulation system work in a linear area; Traversing a plurality of frequency points, and synchronously recording the whole machine radio frequency output power value measured by the power measuring equipment and the baseband signal digital domain input power value obtained by analog-to-digital conversion and digital down-conversion; and establishing a function mapping relation taking frequency and digital domain input power as independent variables and taking the whole machine radio frequency output power as dependent variables as the receiving-transmitting link gain model.
3. The method for adaptive power adjustment of a radar echo simulation system according to claim 2, wherein calculating in real time a theoretical expected echo power of the radar pulse input signal in the test scenario according to a radar equation and the scenario parameters comprises: By calculation formula Obtaining theoretical expected echo power Wherein, the method comprises the steps of, Representing the equivalent radiated power of the radar system, Representing the deployment distance of the radar echo simulation system relative to the radar system, Representing the simulated distance of the simulated target relative to the radar, Representing the radar cross-sectional area of the simulated target, 、、、 Is a learnable parameter used to characterize free space propagation loss and radar equation geometry.
4. The adaptive power adjustment method of a radar echo simulation system according to claim 3, wherein when the test scenario is a single-target fast heave scenario, calculating a transmit link power adjustment parameter in combination with a target according to a power difference between the theoretical expected echo power and the inherent radio frequency output power includes: For the fast fluctuation target model, in each radar pulse period or pulse, the radar scattering cross section area of the simulation target is updated in real time according to the statistical model And recalculate the theoretical expected echo power The radar cross-sectional area of the simulated target in the fast fluctuation target model randomly changes in each radar pulse; Calculating an amplitude linear scaling factor So that the predicted output power scaled by the factor satisfies Wherein, the method comprises the steps of, Representing the model of the gain of the transceiver link, Representing the instantaneous amplitude value of the current pulse signal; linear scaling the amplitude by a factor As the transmit chain power adjustment parameter.
5. The method for adaptive power adjustment of a radar echo simulation system according to claim 3, wherein when the test scenario is a multi-target scenario, calculating the transmit link power adjustment parameter in combination with the target according to the power difference between the theoretical expected echo power and the inherent radio frequency output power comprises: Separately calculate Theoretical expected echo power corresponding to each simulation target at current moment Wherein, the method comprises the steps of, , Representing the number of simulated objects; From the calculated Maximum value is screened out from theoretical expected echo power ; At a maximum value Based on the calculation formula Obtain the first Relative amplitude scaling factor of individual target echo signals ; Scaling the relative amplitude by a factor The transmit chain power adjustment parameters as the respective simulation targets.
6. The method for adaptive power adjustment of a radar echo simulation system according to claim 5, wherein the amplitude adjustment of the current pulse signal in the digital domain according to the power adjustment parameter comprises: By calculation formula Or (b) Obtaining an adjusted signal And the adjusted signal Is input into a digital-to-analog converter and a radio frequency transmitting link to generate a final radio frequency echo signal, Representing the current pulse signal in question, Representing simulated targets Corresponding current pulse signal.
7. The method of claim 1, wherein the rate of amplitude adjustment of the current pulse signal in the digital domain according to the power adjustment parameter is determined by a digital signal processing clock to accommodate the simulation requirements of high-repetition frequency, narrow-pulse radar signals.
8. An adaptive power control device for a radar echo simulation system, comprising: The data acquisition module is used for acquiring scene parameters of a test scene and receiving radar pulse input signals input into the radar echo simulation system; the first data processing module is used for calculating the theoretical expected echo power of the radar pulse input signal in the test scene in real time according to a radar equation and the scene parameters; the second data processing module is used for sampling and analog-to-digital converting the radar pulse input signal in real time to obtain a current pulse signal of the radar pulse input signal in a digital baseband domain and an instantaneous amplitude value of the current pulse signal; The third data processing module is used for calling a pre-built receiving and transmitting link gain model, and predicting the inherent radio frequency output power of the radar echo simulation system when no additional attenuation or gain adjustment is applied according to the instantaneous amplitude value in a feedforward way, wherein the receiving and transmitting link gain model is established based on offline test data and represents the mapping relation between the digital domain input power acquired by analog-to-digital conversion of the radar echo simulation system in a linear working area and the whole machine radio frequency output power; The fourth data processing module is used for calculating a transmitting link power regulation parameter according to the power difference between the theoretical expected echo power and the inherent radio frequency output power and combining with a target; And the power control module is used for carrying out amplitude adjustment on the current pulse signal in the digital domain according to the power adjustment parameter so as to generate and output a radio frequency echo signal.
9. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the method according to any of claims 1 to 7 when executing the computer program.
10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the method according to any one of claims 1 to 7.

Description

Adaptive power adjustment method of radar echo simulation system and related equipment Technical Field The invention belongs to the technical field of radars, and particularly relates to a self-adaptive power adjustment method of a radar echo simulation system and related equipment. Background In the research, development, debugging and acceptance test process of a radar system, a radar echo simulator is widely used as a key simulation test device for reproducing a target echo signal to replace external field actual measurement, so that the test efficiency is improved, the test cost is reduced, and the controllability and the repeatability of a test scene are enhanced. One of the core functions of the echo simulator is to precisely generate echo signals with specific delay, doppler shift and amplitude characteristics according to set radar operating parameters and target scene parameters. The output power of the echo signal needs to strictly follow a radar equation, namely, the output power is dynamically calculated and adjusted according to parameters such as Equivalent Radiation Power (ERP) of a radar system, target distance, target radar cross-sectional area (RCS), atmospheric attenuation, antenna gain and the like. If the output power of the simulator deviates from the theoretical echo power, the accuracy of key indexes such as detection performance evaluation, sensitivity test and dynamic range verification of the radar receiver is directly affected. Currently, radar echo simulation systems commonly employ digital radio frequency storage (DRFM, digital Radio Frequency Memory) technology to capture, store, modulate, and reconstruct radar signals to simulate target echoes with high fidelity. In a dynamic test environment, particularly when the input radar signal has power variation, the signal value acquired by an analog-to-digital converter (ADC) can change, and if the signal value is directly stored and forwarded, the corresponding fluctuation of the digital echo power output by the digital-to-analog converter (DAC) can cause that the echo power output by the whole machine is difficult to accurately control. For this reason, existing schemes typically introduce an Automatic Gain Control (AGC) mechanism in the DRFM front-end or digital domain, which normalizes the amplitude of the incoming radar signal, ensuring that the digital echo signal power subsequently output to the DAC remains constant, as shown in fig. 1. On the basis, the system calculates the required output power according to the target scene parameters (such as distance, RCS and the like), and dynamically adjusts the output power of the whole machine by controlling the digital domain amplitude coefficient or a program-controlled attenuator in a radio frequency output link so as to match the theoretical echo level determined by a radar equation. However, this method has significant limitations in practical applications. The AGC mechanism relied upon in the prior art schemes has inherent drawbacks. The AGC usually detects the envelope of an input signal and feedback-controls a variable gain amplifier or attenuator to realize amplitude normalization, but the control loop has contradiction between response speed and amplitude adjustment precision that gain fluctuation and overshoot are easy to be introduced if the loop time constant is shortened to improve the response speed, stability and precision of amplitude control are reduced, and fast rising edge and short-time characteristics of a radar pulse signal are difficult to track if the time constant is increased to improve the precision, especially when high-repetition frequency and narrow pulse width are processed, the AGC often cannot finish stable adjustment in a single pulse, so that the amplitude distortion inside the pulse or the gain between pulses is inconsistent. Therefore, when facing the diversified waveforms and the high dynamic test requirements of modern radars, the AGC mechanism is difficult to consider the real-time performance, the precision and the fidelity, and limits the application effect of the echo simulator in the high-fidelity scene simulation. Disclosure of Invention The invention aims to solve the technical problem of providing a self-adaptive power adjusting method and related equipment of a radar echo simulation system, so as to eliminate the defects of pulse distortion and response lag caused by adding AGC in the traditional method and improve the power control precision and real-time performance of radar echo simulation. In a first aspect, the present invention provides a method for adaptive power adjustment of a radar echo simulation system, the method comprising the steps of: acquiring scene parameters of a test scene, and receiving radar pulse input signals input into a radar echo simulation system; According to a radar equation and scene parameters, calculating theoretical expected echo power of a radar pulse input signal in a test scene in real time; samplin