Lateral two-wave beam vehicle-mounted Doppler velocity measurement radar equipment

Abstract

The invention relates to lateral two-wave beam Doppler velocity measurement radar equipment, and mainly solves the problems that forward velocity and lateral velocity of a vehicle cannot be measured at the same time and the measurement precision is low in the prior art. The equipment comprises antennas (1), a transceiver (2), a signal processing unit (3) and a power supply assembly (4). The transceiver generates K-wave band continuous wave signals to enter a transmitting antenna, the transmitting antenna radiates to the ground to generate echo signals with Doppler frequency shift, a receiving antenna receives the echo signals and then enable the echo signals to enter the transceiver for amplification and orthogonal frequency mixing, and orthogonal Doppler frequency shift signals are output; and the signal processing unit samples the Doppler frequency shift signals, calculates Doppler frequency shift through a frequency tracking algorithm and calculates forward speed and lateral speed of the radar in combination with wave beam pointing angle information. Random errors caused by vibration and jolt of the vehicle are eliminated, speed measurement mean errors are reduced, accumulative errors are avoided, and the method can be used for measuring the forward speed and the lateral speed of the vehicle relative to the ground.

Description

technical field [0001] The invention belongs to the field of radar technology, in particular to a Doppler speed measuring radar, which can be used to measure the forward speed and lateral speed of a vehicle relative to the ground. Background technique [0002] The common vehicle-mounted speed measuring equipment is mainly the odometer. The odometer borrows the number of rotations of the vehicle tires to directly measure the distance and speed of the vehicle on the ground, which belongs to the mechanical speed measurement. Generally, the odometer is installed on the transmission shaft of the vehicle. When the vehicle is driving, the odometer will be driven to count the number of laps. Combined with the diameter parameters of the vehicle, accurate speed and distance information can be obtained. However, in the event of vehicle skidding, wheel spin, lateral drift, etc., the real-time speed cannot be accurately measured, and lateral speed data cannot be provided, and the odomete...

AI Technical Summary

Problems solved by technology

Since this mode uses a single beam, the beam irradiation direction is along the train running direction, and the lateral velocity cannot be calculated

At the same time, the vertical speed caused by vehicle bumps will be superimposed on the forward speed, which will introduce speed measurement errors, resulting in large measurement errors

[0007] The speed measurement accuracy of the above two radars is relatively low, and they are not suitable for installation on vehicles, and cannot meet the requirements for measuring the forward speed and lateral speed of the car relative to the ground

Images