Wireless ranging and vehicle anti-collision early-warning method and system
A wireless ranging and vehicle technology, which is used in radio wave measurement systems, radio wave reflection/re-radiation, measurement devices, etc. problems, to achieve the effect of predicting road conditions in advance, easy implementation of hardware circuits, and saving hardware costs
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specific Embodiment 1
[0047] A wireless ranging method, the transmitter uses the maximum transmission power P max The electromagnetic wave signal is transmitted, and the receiving end receives the electromagnetic wave signal at the transmitting end, and records the time period ∆t during which the received signal strength is greater than or equal to the set threshold value ∆P within a signal period, or the period during which the received signal strength is greater than or equal to ∆P, The counter is counted to obtain the count value, and the distance between the receiving end and the transmitting end is determined according to the time length ∆t or the counter value; the electromagnetic wave signal emitted by the transmitting end adopts variable power, which satisfies the transmission power and time relationship function within a signal cycle monotonicity (such as Figure 1 to Figure 6 shown); the electromagnetic wave signal emitted by the transmitting end adopts a single frequency radiation.
specific Embodiment 2
[0049] On the basis of the specific embodiment 1, the electromagnetic wave signal emitted by the transmitting end adopts broadcast radiation. In this specific embodiment, the signal is transmitted in the form of broadcast for receiving by the receiving vehicle.
specific Embodiment 3
[0051] On the basis of the specific embodiment 1 or 2, the transmission power of the electromagnetic wave signal emitted by the transmitting end and the time relationship function are monotonously increasing or monotonically decreasing. Set a signal period as t, in the case of monotonically increasing (such as figure 1 , image 3 and Figure 5 shown), from time 0 to time t, the signal transmission power gradually increases, and reaches the maximum value P at time t max , and then drop to 0 instantly; in the case of monotonically decreasing (such as figure 2 , Figure 4 and Figure 6 Shown), the moment 0 moment reaches the maximum value, and then, from 0 moment to t moment, the signal transmission power gradually decreases, and reaches the minimum value at t moment. The minimum value may be 0, or a value whose signal strength is less than or equal to ΔP.
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