Radar refinement ranging method

Abstract

The invention relates to a radar refinement ranging method, and belongs to the technical field of radar signal processing. The ranging signal processing flow of the method comprises the following steps: radio frequency sampling, mixing and filtering, low-sampling frequency re-sampling, speed measurement and distance compensation, pulse pressure and interpolation, filtering and distance compensation. Under the premise of not improving the waveform design difficulty and higher hardware design requirements, the data transmission rate is high, the distance measurement accuracy is improved, the radar working performance is improved, and the radar production cost is reduced. The method solves the problems that the existing ranging mode is only used for sampling once, resulting in large samplingdata amount, increased waveform design difficulty when the signal bandwidth is increased, increased data amount, and difficult requirement meeting of the data transmission rate, and that the signal processing is rough, and if requiring increased signal bandwidth, improved data transmission rate and ranging accuracy, higher standard waveform design and hardware design support are requested, and higher requirements for corresponding sampling and data processing chips are also requested, resulting in difficulty in design and fabrication, and increased equipment cost.

Description

technical field [0001] The invention relates to a radar refined ranging method, which belongs to the technical field of radar signal processing. Background technique [0002] Signal processing is one of the core technologies of modern radar systems, and ranging is an important part of signal processing. The quality of ranging directly affects the accuracy of radar detection target distance. An important parameter to measure and reflect the radar detection distance accuracy is the distance resolution, [0003] The distance resolution formula is as follows: [0004] [0005] In the formula, B Indicates the bandwidth; T e Indicates the transmitted pulse width or the equivalent pulse width after pulse compression; c is the electromagnetic wave propagation speed; visible, pulse width T e The narrower, that is, the frequency modulation bandwidth of the transmitted signal B The wider the distance resolution DR Also higher. However in T e Under the same pulse width co...

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Problems solved by technology

However in T e Under the same pulse width condition, the FM bandwidth B The larger the waveform design is, the more difficult it is, and the higher the requirements for system hardware design; moreover, the frequency modulation bandwidth B The larger the sampling frequency f s The higher the value, the greater the amount of data, which requires a higher data transmission rate and signal processing rate. For this reason, better data transmission hardware and signal processing chips need to be configured, which greatly increases the cost of the radar system.

The traditional ranging method generally only samples once, and the amount of sampled data is large. When the signal bandwidth is increased, the difficulty of waveform design increases, the amount of data increases, and the data transmission rate is difficult to meet the requirements; and the signal processing process is rough—traditional ranging The method does not perform interpolation and digital filtering, but directly obtains the maximum position of the target in the distance dimension after obtaining the target envelope, and calculates the distance corresponding to this point, so as to obtain the target distance information

In this way, in order to achieve the purpose of increasing the signal bandwidth, improving the data transmission rate and ranging accuracy, the traditional ranging method must be supported by a higher standard waveform design and hardware system design. The requirements for corresponding sampling and data processing chips It is also higher, resulting in difficulties in design and production, and greatly increasing the cost of equipment

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