外文资料:Based on nRF24E1 and TMC2023 automobile collision avoidance system development and realizationCar engineering department of institute of technology of MunichBy LORENZ FERDIDADProgress of society with the development of times, more and more cars have entered ordinary peoples family. Though the highway terms is being updated, yet avoid the crowded current situation of getting on the car of unavoidable highway, in addition, the speed is improved gradually, the malignant traffic accident is happening all the time, have brought the enormous life and property loss to people and the society. Car anticollision system whether one can send out seeing and hearing survey device of warning signal in advance to driver. It install, at car, can survey, attempt pedestrian, vehicle or barrier around close the automobile body usually; Can send out and collide the dangerous signal soon to driver and passenger ahead of time, impel driver bypass driver take emergency measure punish special dangerous situation even, avoid losses. At present, though various countries study, prevent system of colliding from (usually call the initiative security system in the world), but how could solve the timid and alert problem better, perplexing relevant workers all the time. The researcher in the world studies through a large number of experiments, has already reached common understanding, if want to solve problem described above effectively, the anticollision system must have the following functions:1)Must be capable of examining the angle, the azimuthal information of the goal is essential for removing emptily and alertly (2)Apt to produce anti-interference performance strong complicated transmission signal, cooperate with real-time high-efficient signal deal with with goal measuring algorithms, in order to remove emptily and alertly. Only the above two points combine together and guarantee the systematic dependability that the car defends colliding closely.1 TMC2023 chip and the nRF24E1 chip characteristic introduced TMC2032 is one kind of new entire digital correlation instrument electric circuit, its correlation word length and the related threshold are programmable. This chip is the monolithic 64 CMOS entire numeral correlation instrument large scale integrated circuit which American TRW Corporation recent years promoted, its interior had three independent clocks 8 displacements positions registers (stochastic data register A, local code register B and shield code register M); Moreover also has 7 registers to use for to load pre-placed limit. 0 64 between wilfully long stochastic data and the local code after the correlation operation, by the three samit the cushion 7 BCD code output, and limit compare with the initialization in the comparator, if the correlative value is bigger than or is equal to limit, then the flag bit by lowly changes high. Because has used the advanced high speed CMOS production craft, the parallel correlation speed reaches as high as above 30MHz. But widely applies to synchronization, the matched filtering, harms in the code examination, the recording and the bar code recognition, especially suits to the radar signal recognition. NRF24E1 is one kind of operating frequency may achieve 2.4GHz the wireless radio frequency receiving and dispatching chip, the channel operation time is smaller than 200 mu s, the data rate is 1Mbps outside, does not need to meet the SAW filter, is global general low cost radio frequency system level chip which the present world promotes for the first time. The interior inlays has with 8,051 compatible microprocessors and 10 9 inputs A/D switches, may between under the 1.9V 3.6V voltage the steady work; The interior also inlays have impress the adjuster and the VDD voltage monitoring device. Wireless receiving and dispatching partially has with the nRF2401 similar function, this function starts by the internal parallel mouth and internal SPI, each due-out signal says regarding the processor all may take severs carries on the programming, or gives the microprocessor through the GPIO port biography. Chip nRF24E1 may realize the wireless communication in world public frequency band scope 2.4 2.5GHz. Receives and dispatches the partial packages to include the frequency divider, the amplifier, the regulator and two receiving and dispatching units. The output energy, the frequency band and other radio frequency parameter passable radio frequency registers conveniently have programmed the adjustment. Under the transmission pattern, the current consumption only has 10.5mA; Under the receive pattern, the current consumption only has 18mA, therefore the power loss is quite low.2 systems structures entire wrap information gathering system is composed by five sets of radio frequencies launches and the receiving device, each set of launches and the receive partial basic electric circuits all are same, these five sets of transmitter-receiver set also is connected with the