Device and method for accurately simulating radar target distance with chirp signal

Abstract

A device and method for accurately simulating the radar target distance of a linear frequency modulation signal, including a down-conversion unit, an intermediate frequency amplification unit, and a delay unit. The down-conversion unit is composed of a millimeter-wave down-converter module, which converts the received millimeter-wave radar signal into an intermediate-frequency signal , which is convenient for post-stage processing; the intermediate frequency amplifying unit is composed of a PXI bus programmable amplifier module, which amplifies the amplitude of the intermediate frequency signal after down-conversion and adjusts it according to different gain requirements; the delay unit is composed of a baseband generating module and an I / Q modulator Module and power control module, modulate the baseband signal to the carrier signal, and control the amplitude of the modulated signal. The baseband signal is used as the modulation signal, and the received radar chirp signal is used as the carrier signal for frequency modulation. The frequency information set by the baseband signal reflects the distance of the target. The realization method is based on the idea of ​​frequency modulation, and the simulation of the radar target distance is realized.

Description

technical field [0001] The invention belongs to the technical field of radio frequency microwave testing, in particular to a device and method for accurately simulating a radar target distance of a linear frequency modulation signal. Background technique [0002] The traditional linear frequency modulation signal radar target distance simulation device is mainly composed of a down-conversion unit, an intermediate frequency amplification unit, a delay unit, and an up-conversion unit. , and then collect the intermediate frequency signal, store the data, convert D / A, and process the frequency up conversion to obtain the echo signal. [0003] The existing device and method for simulating the radar target distance of the chirp signal have the following deficiencies: [0004] 1. Due to the high-speed data acquisition and storage technology, the sampling accuracy is related to the processing speed of the processor. At present, the final simulation accuracy is limited because the p...

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Problems solved by technology

[0004] 1. Due to the high-speed data acquisition and storage technology, the sampling accuracy is related to the processing speed of the processor. At present, the final simulation accuracy is limited because the processor speed cannot keep up with the sampling speed.

[0005] 2. Due to the use of large-capacity memory for data caching, the larger the memory capacity, the longer the simulation distance. At present, even if the most advanced DDR memory is used, the stored data capacity is limited, and it can only simulate a distance of tens of meters at most, so This method can only perform short-distance simulations, and the length of the fiber delay line used in long-distance simulations will also be limited, resulting in a limited final simulation distance

[0006] 3. In the existing radar target distance simulation method for chirp signals, the method of large-capacity storage + delay line is often used for target distance simulation, which eventually leads to large simulator size and high cost

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