Multi-waveform transmit-receive radar system scheme

Abstract

The invention belongs to the field of system scheme design in the radar technology, and particularly relates to a multi-waveform transceiving radar system scheme. According to the method, three-waveform combined programming emission and combined processing of the receiving end are adopted, large bandwidth in the physical sense is achieved, meanwhile, the receiving end and the emitting end are combined for real-time demodulation to achieve decoupling of the distance and the speed, the stepping frequency of the emitting end is controlled in real time, and balance of computing power and real-time performance is achieved.

Description

Technical Field

[0001] This invention belongs to the field of system design in radar technology, specifically relating to a multi-waveform transceiver radar system. Background Technology

[0002] With the rapid development of modern radar technology, the requirements for target detection accuracy, anti-jamming capability, and multi-task processing capability are constantly increasing. Traditional single-waveform radar systems typically use fixed or single-modulation transmitted signals (such as continuous waves, pulse waves, or linear frequency modulated signals) during operation. They have poor adaptability in complex electromagnetic environments and cannot simultaneously meet multiple requirements such as high resolution, long-range detection, and low probability of intercept.

[0003] To enhance the overall performance of radar systems, multi-waveform transceiver technology has gradually become a research hotspot. This technology effectively enhances the flexibility and adaptability of radar by dynamically switching or combining multiple transmitted waveforms with different modulation characteristics (such as LFM, FMWC, phase coding, random noise, etc.) within the same radar system. For example, in low probability of intercept (LPI) scenarios, non-periodic waveforms can reduce the probability of detection by enemy reconnaissance equipment; in high-resolution imaging missions, broadband signals can be used to achieve fine range resolution; and in multi-target tracking, waveform diversity can improve channel capacity and target separation capabilities.

[0004] Therefore, how to design a multi-waveform transceiver radar system with efficient waveform scheduling capabilities, a collaborative optimization mechanism for transceiver channels, and flexible configuration support has become a pressing technical challenge in the field of radar system design. Summary of the Invention

[0005] The present invention aims to address the aforementioned problems by proposing a multi-waveform joint transceiver radar system. The goal is to achieve higher radar resolution by overcoming the inherent bandwidth limitations of FMCW radar through the transmission of three stepped waveforms with different slopes, which are then effectively processed at the receiving end.

[0006] The core idea of ​​this invention lies in the combined design of transmitting and receiving waves. By designing three stepped-frequency waveforms with different slopes at the transmitting end, and then using different modules at the receiving end to perform different layered analysis based on the transmitted waveform, ultra-high range resolution can be obtained. At the same time, the parameters of the transmitting end are adjusted based on the target results.

[0007] To facilitate understanding, we will first introduce the signal model used in this scheme:

[0008] First, we need to establish the basic step frequency mathematical model as follows, and the CCM radar transmit chirp center frequency design is as follows.

[0009]

[0010] Here, m represents the m-th chirp, and Indicates the center frequency of the step frequency. The step frequency shift represents the step frequency. Indicates the direction of movement.

[0011] Then the radar transmission waveform is as follows:

[0012]

[0013] Here, K represents the slope of the frequency-modulated continuous wave.

[0014] The signal received at the receiving end is then represented as follows.

[0015]

[0016] Then, the baseband signal is obtained through deskewing at the receiving end.

[0017]

[0018] The technical solution of this invention is:

[0019] A multi-waveform joint transceiver radar system, characterized by comprising the following steps:

[0020] S1. First, the transmitter includes a device with a variable transmission frequency and a center frequency. Then, it transmits three different programmed waveforms, including a positive step frequency, a negative step frequency, and a normal FMCW waveform. The step slopes for the positive and negative waveforms must be variable, not necessarily identical in absolute value. The transmission parameters... The step frequency shift of the step frequency, The stepping direction is controlled by internal launch programming;

[0021] S2. Timing settings for transmitted waveforms: Three waveforms are transmitted centrally at transmission times M1, M2, and M3 respectively. These three transmitted waveforms are encoded and transmitted by a separate intelligent control center. After transmission, time T is reserved for reception and processing at the receiving end.

[0022] S3. The receiver receives the signal and, after passing through traditional 2D-FFT and CFAR, obtains the radar target index information of the target.

[0023] S4. Then, after passing through the main module, based on the positive and negative point cloud indices, it enters the TFM (Fast Matching Module), calculates the index by setting specific rules, and then obtains the match that satisfies the smallest unit.

[0024] S5. After matching, the data passes through the FGTC (False Target Removal) module, and then the point cloud is output.

[0025] S6. Based on the obtained point cloud, for example, if the point cloud value is less than M, then modify the parameters. The step frequency shift of the step frequency, Modify the step direction, re-emit the waveform, and then repeat S1-S6 to continuously acquire real-time point clouds.

[0026] The beneficial effects of this plan are:

[0027] This invention employs a three-waveform joint programming transmission and a receiver joint processing to achieve a large bandwidth in a physical sense. At the same time, the receiver and transmitter work together in real time to demodulate, thus decoupling distance and speed. Furthermore, the real-time control of the transmitter's step frequency achieves a balance between computing power and real-time performance. Attached Figure Description

[0028] Figure 1 Schematic diagram of the original FMCW wave generation

[0029] Figure 2 Schematic diagram of frequency-modulated step wave

[0030] Figure 3 Schematic diagram of three types of wave generation

[0031] Figure 4 Multi-holistic solution framework

[0032] Figure 5 TFM module

[0033] Figure 6 FGTC module Detailed Implementation

[0034] A multi-waveform joint transceiver radar system, characterized by comprising the following steps:

[0035] S1. The transmitter simultaneously transmits three waveforms as one frame: a rising waveform, a falling waveform, and a normal FMCW waveform. Set to 1.35MHz, with one direction (a) set to 1 and the other to -1, while a normal FMCW... Set to 0, and a to 1;

[0036] S2. Transmit three different waveforms at times M1, M2, and M3, and then wait for time T to receive radar data.

[0037] S3. Perform 2D-FFT and CFAR on the three different radar waveform data respectively, and then obtain the RV spectrum point cloud index of the radar.

[0038] S4. Obtain the processed data of different radar waveforms, and then input the positive step frequency and negative step frequency index data into the TFM (fast matching module) to obtain the matching index value;

[0039] S5. Based on the matched point cloud data, enter the FGTC (False Target Removal) module and output the final point cloud.

[0040] S6. Based on the obtained point cloud, for example, if the point cloud is less than 300, increase the step frequency shift by 1MHz, reverse the step direction, transmit the waveform again, and then repeat S1-S6 to continuously acquire the real-time point cloud.

[0041] In summary, the multi-waveform transceiver radar system proposed in this invention can obtain a final high-resolution range point cloud by transmitting step frequencies with different slopes and directions, receiving different transmitted waveform data, and then performing matching and spurious point removal at the receiving end. This method is simple, effective, and has high processing efficiency.

Claims

1. A multi-waveform transceiver radar system scheme, characterized in that... Includes the following steps S1. First, the transmitter must include a device with a variable transmission frequency and a center frequency. Then, it must transmit three different programmed waveforms, including a positive step frequency, a negative step frequency, and a normal FMCW waveform. The step slopes for the positive and negative waveforms must be variable, not necessarily identical in absolute value. The transmission parameters must also be... The step frequency shift and α step direction are both controlled by internal transmit programming; S2. Timing settings for transmitted waveforms: Three waveforms are transmitted centrally at transmission times M1, M2, and M3 respectively. These three transmitted waveforms are encoded and transmitted by a separate intelligent control center. After transmission, time T is reserved for reception and processing at the receiving end. S3. The receiver receives the signal and, after passing through traditional 2D-FFT and CFAR, obtains the radar target index information of the target. S4. Then, after passing through the main module, based on the positive and negative point cloud indices, it enters the TFM (Fast Matching Module), calculates the index by setting specific rules, and then obtains the match that satisfies the smallest unit. S5. After matching, the data passes through the FGTC (False Target Removal) module, and then the point cloud is output. S6. Based on the obtained point cloud, for example, if the point cloud value is less than M, then modify the step frequency shift of the step frequency Δf, modify the step direction α, retransmit the waveform, and then repeat S1-S6 to continuously acquire the real-time point cloud.

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