77GHz Radar Target Simulator

Closest distance

0m@airgap=3m

5m@airgap=3m

In HIL applications, it is hoped that a closer distance can be simulated

Longest distance

800m, generally unlimited

Usually 300m, if it is longer, the cost will be higher

Digital is achieved through software, and optical fiber requires hardware cost

Distance step/accuracy

1mm

1cm

A. From the perspective of measurement accuracy, for 2GHz bandwidth radar, the distance resolution can reach 100mm (considering windowing), the distance measurement accuracy can reach 5mm, and it is hoped that the simulator accuracy can reach 0.5mm
B. From the perspective of high-fidelity simulation, continuous simulation should be performed, and pulse level stepping requires high accuracy.

Speed step/accuracy

0.002m/s

0.01m/s

For most automotive radars, the speed accuracy is 0.1m/s, and the requirement for the simulator is 0.01m/s; but for some radars with high speed measurement accuracy, the accuracy can reach 0.02, and the simulator speed measurement accuracy is also required to reach 0.002

RCS dynamics

110dB

90dB

The dynamic range caused by the radar at a distance of 3-300m in the simulator reaches 80dB, and the dynamic range of the car RCS is 20dB, with a total of 100dB. It is hoped that the simulator dynamic reserve will be sufficient, and 110 is better.

Instantaneous bandwidth

2GHz

5GHz

At present, the use of vehicles is basically within 2GHz. If other applications are considered, a large bandwidth can also be selected.

Intra-band flatness

2dB

5dB

Provide guarantee for the waveform quality of the distance dimension.

Target parameter update rate

25ns, determined by FPGA clock

1ms

From the perspective of pure data rate, under Hil application, the radar data update time is about 20ms, and it is hoped that the simulator target update rate can be less than 2ms. From the perspective of radar simulation, continuous simulation should be performed, and the distance movement within the frame must occur at high speed. It is best to reach the pulse level. Generally, the short pulse is 10us. It is hoped that the simulator data update time can be 1us.

Multi-target

Multiple targets in a single channel

1 target per channel

Dual targets can measure distance resolution and speed resolution. Multi-targets can simulate more scenarios. Each target of optical fiber requires a distance delay line, which is costly.
A digital single channel can achieve multiple targets through a chip, which is low in cost, but the cost of multi-angle targets is no different from that of a fiber optic simulator.

False target

5dB worse than fiber noise floor, higher probability of false targets at close range

Large signal also has wild value

The digital close-range compensation algorithm will cause a small deterioration of phase noise, and there is no difference between long-distance targets and optical fibers.

Interference signal generation

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Because digital RTS has built-in ADC, FPGA, and DAC, common instrument functions can be achieved through software

Time-frequency diagram

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Spectrum diagram

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EIRP measurement

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