Accurate simulation device and method of radar target distance for linear frequency modulation signal

Abstract

The invention relates to an accurate simulation device and method of a radar target distance for a linear frequency modulation signal. The accurate simulation device is composed of a down conversion unit, an intermediate-frequency amplification unit and a delay unit. The down conversion unit is formed by a millimeter-wave down converter module and is used for converting a received millimeter-waveradar signal into an intermediate-frequency signal for post-stage processing. The intermediate-frequency amplification unit consists of a PXI bus programmable amplifier module and is used for amplifying an intermediate frequency signal amplitude after down conversion and carrying out adjustment based on different gain needs. The delay unit is composed of a baseband generating module, an I / Q modulator, and a power control module and is used for modulating a baseband signal to a carrier signal and carrying out amplitude control on the modulated signal. The baseband signal is used as the modulation signal, the received radar linear frequency modulation signal is used as the carrier signal for frequency modulation, and the frequency information set by the baseband signal reflects the distanceof the target. The method is implemented based on the idea of frequency modulation; and 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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