TW200941023A - Multi-lane vehicle detection apparatus - Google Patents

Abstract

A vehicle detection apparatus adopting microwave sensing schemes for performing the multi-lane vehicle detection is provided in the present invention. According to the present invention, the signal-to-noise ratio (SNR) of the detected reflecting wave is varied within an inconsiderable range so that the provided apparatus may exhibit a unique property which is adoptable for the multi-lane vehicle detection and the precision is unachievable by the existing detectors.

Description

200941023 IX. Description of the invention: [Technical field to which the invention pertains] In particular, the invention relates to a vehicle detector. [Prior Art] Ο

The vehicle detector is deployed on the road according to the needs of traffic management monitoring to collect traffic information for the vehicle flow judgment and the number of time calculations, and with the automatic evaluation mode, the overall system will calculate ^Required road conditions in a variety of vehicle detectors, the current domestic traffic control system engineering is the ring route to the vehicle side n 'the # by the vehicle in (four) smashed by the car and the change in the inductance of the coil, to detect Measuring the time of the car to close the lane, _ caused a bribe. Weiwei private must be 7-group Du Buli, and the maintenance cost of the latter is even more; ^^Set-part _, not only cost 5 200941023 In addition, the vehicle detection system using Doppler radar is only applicable. In order to detect accurate vehicle speed, it is impossible to obtain parameters such as vehicle type, lane occupancy rate and traffic density. 0 Remote frequency microwave type with frequency modulation continuous wave s weekly variation (FreqUenCy_M〇£juiati〇n Contmuous-Wave'FMCW) technology Detector, a low-cost, all-weather finder, whose fixed fan beam continuously emits low power _ tender wave; its wealth will be on the surface of the road, invisible ·!: oval imprint Any object that is not a scene will transmit the reflected signal back to the detector for target detection and distance measurement. It is a highly promising vehicle detection device.八 However..., "Wgong's microwave-type vehicle detection device, the frequency and digital signal processor' must perform corresponding post-segment signal processing for the echo energy from the target at different distances, and the subsequent follow-up position_vehicle flow The parameters are used, so ^ actual should be, upper, limited, and the cost is different after the processing of the city and the car is Nanang.

As can be seen from the above description, there is a need for a vehicle detection device that is relatively low cost and can detect multiple lanes simultaneously. In view of the above-mentioned needs, the applicants have carefully studied and proposed the above-mentioned lack of the vehicle-side device of the "multi-vehicles and women". SUMMARY OF THE INVENTION The first concept of the present invention is to provide a microwave type vehicle detection that does not need to perform different back-end signal processing for different echoes, and can be used for: lane detection. ^Ding Xi According to the above concept, the microwave type vehicle detecting device of the present invention comprises a radio frequency 6 200941023, and at least two leakage wave antennas and an intermediate frequency and digital signal processing single μ ΪΙ 敏 包括 包括 包括 包括 包括 包括 包括 包括 包括 包括At the signal output end, the line systems are closely coupled to each other and coupled to the signal input terminal and the second terminal, and the intermediate frequency and digital signal processing unit is connected to the radio frequency eight: 丨盥 in response to the RF transceiver unit The difference-frequency signal produces at least a traffic parameter corresponding to at least the lane. The smuggling antennas are configured to receive a target area = t microwave money, so that the received signal ratio of the reflected microwave signal is changed

*^ is committed at 32, and the microwave car-test device is used to perform the multi-lane detection. In view of the above concept, the microwave vehicle pre-measurement device further includes an antenna assembly such as an adjustment device, and a relay to adjust one of the lifting angle and the height of the antenna. Eight π according to the above concept 'where the RF transceiver unit further includes a voltage controlled oscillation =, lightly connected to the voltage control amplifier - buffering Α ιι, secret to the buffer amplifier - power divider, - the first driver amplifier and - a second driver amplifier, a mixer and a low noise amplifier, wherein the first driver amplifier is reduced to a "first end" of the power supply 5 and the second driver amplifier is connected to the power amplifier a second end; the hybrid H is coupled to the first crane amplifier, and the low noise amplifier is coupled to the mixer. According to the above concept, the voltage controlled oscillator of the RF transceiver unit, the buffer amplifier, the power distribution n, the first and second drivers, the mixer and the low noise amplifier are integrated on a chip. . According to the above concept, one of the antennas has a distance of less than 5 mm. According to the above concept, one of the antennas has an isolation system greater than 4 books. 7 200941023 According to the above concept, the traffic flow parameter is one of vehicle speed, vehicle type, lane occupancy, traffic density and traffic flow. A second aspect of the present invention provides a built-in vehicle detecting device for performing multi-lane detection. The embedded vehicle detecting device is characterized by including a system chip, an antenna module, and an intermediate frequency. The digital signal processing unit, wherein the system chip is integrated with an RF signal transceiver module, and the antenna module and the intermediate frequency and digital signal processing unit are coupled to the RF signal transceiver module. ❺

According to the above concept, the intermediate frequency and digital signal processing unit generates a difference frequency signal in response to a frequency-modulation continuous-wave (FMCW) signal generated by the RF signal generating module. The difference frequency signal corresponds to at least one traffic parameter of at least one lane. According to the above concept, the antenna module is configured to receive a reflected microwave signal of a target area, so that the received signal variation of the reflected microwave signal is less than 32 dB for the embedded vehicle detection. The measuring device performs the multi-lane detection. According to the above concept, the towel group includes at least the system of the leaky wave. According to the above concept, the pair of 4 leakage wave antennas is less than 5 mm. One of the wave antenna isolations is greater than the above concept, where the pair of leaks 8 200941023 40 dB. Vehicle type, lane occupancy According to the above concept, the vehicle flow parameter is one of the vehicle speed, traffic density and traffic flow. The solution is read by the following succinct and detailed description, so that the reader can go deeper [Embodiment] 〇〇之-二in? 'It is a system block diagram to illustrate the implementation of the frequency modulated continuous wave according to the present invention. The traffic detection device 1 of the lane includes a receiving antenna array U and a frequency transmitting and receiving terminal _, /, respectively coupled to the microwave type and signal terminal 132 of the microwave type vehicle detecting device 1, and furthermore, On the radio frequency, the IF and the number of pure processors 14, 70 _ are connected for on-the-spot evaluation of the field measurement, and 1 can be used to generate the required signals - the vehicle lane occupancy, the traffic density and the vehicle. Traffic flow parameters such as flow. In the embodiment, the receiving antenna array u is disposed in the same manner, and is connected to the transmitting antenna array in a close-to-lion sequence between the tit columns of the second figure. 12 light I:, ^f S21 is the lesser effect between the receiving antenna arrays, the lower the two antenna array 9 200941023 In the above embodiment, the RF transceiver unit 13 is a 18 1P6M CMOS The integrated system wafer, the third figure illustrates the layout of such a system wafer 3 developed by the inventor of the present invention, wherein the system crystal is buffer-amplified by voltage-controlled oscillation H (VCO) 3b II 32, Power distribution state 33, low noise amplifier (LNA) 34, and two driver amplifiers (Amp-LO) 35, (Amp-TX) 36 and mixer 37 are integrated to perform signal _ carving Most of the sheds are thieves. In addition, a power amplification II can be additionally provided outside the system chip 3 to further increase the power of the signal outputted by the system chip 3. In a preferred embodiment according to the invention, the system wafer 3 is designed using a Complementary-Coiutoing-Strip Transmissim Line (CCSTL) technique, by C(:STL technique The realized wafer leg block connection can improve the isolation required by the FMCW radar; preferably, the power splitter 33 is composed of two CCSTL of 70.7 Ω and an insulation resistor of 1 〇〇Ω, and has two The output port is connected to two driver amplifiers (A^L〇) 35 and (Amp_TX) 36 via CCμηη and 320 μηη CCS TL, respectively. —, / In the present invention, a digital signal processor external to the chip The controlled triangular wave is fed to the VCO 31' on the wafer and the power distribution n33, after allocating the transmitted signal, feeds the distributed signal to the driver amplifier (Amp_LO) 35, (Amp_TX) 36 via the two outputs respectively. Figure 4 is a schematic view showing the erection mode of the multi-lane vehicle detecting device of the preferred embodiment of the present invention. The multi-lane vehicle detecting device 4 is used to carry out the vehicle using the microwave type detecting method. Detection; wherein the multi-lane auxiliary detection device 4 is erected on the road side at a height h from the ground, and the distance is measured in the field of D to detect the vehicle occupancy rate in the multi-lane, and the distance d is multi-vehicle 200941023 The channel width parameter 1 borrows / _ multi-lane traffic parameters, and the maximum coverage of the detection device; wherein the range is represented by the detection ί ^ line ̄ volume field shape. In this embodiment, the microwave The vehicle detection device is located in the outer casing 41, and the integrated radio frequency and digital processing unit of the RF transceiver unit is integrated therein.

On the upper surface of the metal casing and covered with a radome (not shown), the pupil plane of the antenna array is perpendicular to the lane, and an adjustment angle is adjusted by an adjusting device 42 to help suppress the movement of the vehicle. The Doppler effect is generated 'and the _ ratio of each lane echo 调整 is adjusted; _ the device touch height h and the horizontal set D between it and the target vehicle are respectively 3 meters illusion meter. In the preferred embodiment of the present invention, the (four) leaky wave antenna array is used to construct the above-described vehicle detecting device, and the measurement result is as shown in the fifth figure. "Monthly refer to the fifth figure's multi-lane vehicle surveying device shown in the fourth figure at different lifting angles (35. and 50.), its signal-to-noise ratio (Signal_tG_N()ise Rati〇, SNR) The horizontal distance from the location of the target vehicle county is based on the map. It is understood that the multi-lane vehicle detecting device of the present invention receives a target vehicle at a different horizontal distance of 5 meters to 100 meters (where D is 30 meters, which is equivalent to 6 to 8 soils, visibility). When the microwave signal is reflected, the signal-to-noise ratio (Signal-t〇-N〇ise Rati〇, SNR) of the reflected microwave signal received at different distances is 28 due to the leakage wave antenna. accustomed to. In addition, please refer to the sixth figure, which further illustrates the relationship between the echo energy difference of the multi-lane vehicle detection device and the horizontal distance D at different erection heights, wherein the curves (A), (B), (C) And (D) indicate the measurement results of the erection height h of 2, 3 4 and 5 meters, respectively. It can be seen from the figure that when the horizontal distance between the multi-lane vehicle pre-measuring device and the target vehicle is 30 m and the erection height is 5 m, the maximum echo energy difference is about 30 to 35 dB; overall, the multi-lane of the present invention 200941023

It is generally small within the range of variation of the echo energy difference of the 32dB vehicle detection device. In other words, 'when the vehicle_device of the present invention performs multiple lanes' is not caused by the _ distance of the lane of the individual vehicle and the _ _ _ _ _ _ It can be converted into the speed of the vehicle, the type of the vehicle, and the lane occupancy rate even with the singularity of the simple intermediate frequency and digital signal processing unit. Therefore, the vehicle can be modified by the present invention. ^ Collecting traffic data from multiple lanes. In the present invention, the Millennium Team first proposed the secret chip of the RF (10) circuit module or the multiplex 8 RF signal transceiver unit, two planes, the Langpo scale column and the middle The microwave-type vehicle composed of the frequency and signal processing unit is placed in the traffic management system for multi-lane vehicle measurement. By the present invention, the juice can be used to make the side of the shouting energy box car _ at the position The distance is changed, and the signal-to-noise ratio is changed to a negligible range. Therefore, the detector of the present invention can still turn to the side accuracy under different target distances.贞贞 ride can not be achieved Multi-lane detection. This $'s day has produced a dual Laibotian, (four) shape design, she is a single-antenna hybrid in the traditional microwave detector, and it still has excellent isolation under tight system ^ ' There is no need to use a high-priced circulator to connect the transmitter output = two antenna connectors and the receiver input, and can be fabricated on a printed circuit board for mass production, so it has small size, high accuracy, and low manufacturing cost. The advantages of this application have the potential of application and the value of industrial promotion. Based on the above description, the invention is a novel, progressive and industrial invention, and it is a development ship. For the purpose of modification, the following figures are intended to illustrate the microwave type vehicle according to the preferred embodiment of the present invention. Detecting device; the second figure is the vehicle_position towel receiving antenna array of the present invention and the emission of the sky 触 触 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Used in the microwave type vehicle The layout of the system wafer; the fourth diagram is a schematic diagram for explaining the erection mode of the multi-lane vehicle detection of the present invention; the fifth figure is for explaining the fourth-show multi-lane vehicle side device in different lifting orders , the relationship between the signal-to-noise ratio (_) and the horizontal distance D of the target vehicle from the erection point; and the sixth diagram of the step-by-step description of the multi-lane vehicle debt measurement shown in the fourth figure at different erection heights The relationship between the echo energy difference (Ech〇p〇wer) and the horizontal distance D of the target rut distance from the erection point. [Main component symbol description] 1 Microwave type vehicle detecting device 11 Receiving antenna array 12 Transmitting antenna array 13 RF transceiver unit 131 signal input terminal 132 signal output terminal 13 200941023

14 IF and digital signal processor 3 System chip 31 Voltage controlled oscillator 32 Buffer amplifier 33 Power splitter 34 Low noise amplifier 35 Driver amplifier 36 Driver amplifier 37 Mixer 4 Vehicle detection system 41 Enclosure 42 Adjustment device

14

Claims (1)

200941023 X. Application for patents: 1. A microwave-type vehicle-side device for multi-lane detection, comprising: an RF transceiver unit comprising a signal input terminal and a signal output terminal; Leaky wave antennas 'coupled to each other and coupled to the signal input terminal and the signal output terminal respectively; and __, an intermediate frequency and digital signal processing unit coupled to the RF transceiver to generate at least one traffic parameter corresponding to at least one lane respectively in response to the difference frequency signal generated by the frequency strobe transceiver unit; The antenna system is configured to receive a signal-to-noise Rato (SNR) variation of the reflected microwave signal when receiving a reflected microwave signal of a target area, Thereby the multi-lane detection is performed. 2. According to the microwave-type vehicle destroying position of the third item, it also includes an adjustment device, which is one of the heights of the antennas. According to the microwave type vehicle detecting device of the patent application, the frequency transceiving unit further comprises: a voltage controlled oscillator; a buffer amplifier coupled to the voltage controlled amplifier; a distributor coupled to the buffer amplifier; a first-drive amplifier — and a second crane Α||, wherein the first driver amplifier is secreted to the first end of the power splitter, and the second The driver 15 200941023 is coupled to one of the second ends of the power amplifier; a mixer coupled to the first driver amplifier; and a low noise amplifier coupled to the mixer. 4. The microwave type vehicle detecting device according to claim 3, wherein the voltage controlled oscillator of the radio frequency transceiver unit, the buffer amplifier, the power splitter, the first and second drivers, and the mixer The low noise amplifier is integrated on a wafer. 5. The microwave type vehicle detecting device according to claim 1, wherein one of the antennas has a distance of less than 5 mm. 6. According to the microwave type vehicle detecting device of claim 1, wherein One of these antennas has an isolation greater than 40 dB. 7. The microwave type vehicle detecting device according to claim 1, wherein the vehicle flow parameter is one of a vehicle speed, a vehicle type, a lane occupancy rate, a traffic density, and a traffic flow. An embedded vehicle detecting device for performing multi-lane detection, comprising: a system chip having an RF signal transceiver module integrated on the system chip; an antenna module coupled to the system chip; and a system The IF and digital signal processing unit is coupled to the RF signal transceiver module, wherein the IF and digital signal processing unit is responsive to the RF signal transceiving module to generate a frequency modulated continuous wave (Frequency-Modulation Continuous- Wave, FMCW) generates a difference frequency signal corresponding to at least one traffic parameter of at least one lane; 16 200941023 The embedded vehicle detection device is characterized in that the antenna module is configured When receiving the reflected microwave signal of a target area, the received signal-to-noise ratio (SNR) variation of the reflected microwave signal is less than 3 2 dB ' for the embedded vehicle detecting device to perform The multi-lane detection. 9. The embedded vehicle detection device of claim 8, wherein the antenna module comprises at least one pair of leaky wave antennas. Ο 10. The embedded vehicle detection device of claim 9 further comprising an adjustment device coupled to the antennas for adjusting one of a lift angle and a height of the antennas. 11. The embedded vehicle-testing device according to claim 9 of the patent application, wherein the distance between the pair of leaky wave antennas is less than 5 mm. 12. According to ΐ please apply the ninth item of the built-in vehicle side device, wherein the isolation coefficient of the pair of leaky wave antennas is greater than 4 〇 dB. Please refer to item 8 of the patent to read the vehicle-side device, which is one of the vehicle speed, vehicle type, lane occupancy, traffic density and traffic flow.