|
|
 |
|
|
Standards on anti-theft system by jodie mht
|
|
|
Standards on anti-theft system |
|
|
|
|
|
Automotive
|
|
|
The magnetic field generated by the magnetic ring antenna can cause the well-known field distribution, coupling good and completely non-coupling region is formed between the base station antennas and identification device antenna. Coupling region, of course, no data and energy transmission, keyless entry system of identification device position in the magnetic field is random, therefore, must take appropriate measures to minimize the scope of this region. Rotating magnetic field generated by the base station is a solution to the rotating magnetic field generated by the orthogonal antenna. However, this method is more complex, often by small car antenna space restrictions. Another alternative is relatively simple, the three-dimensional antenna analog front-end chip, such as the TMS37122. The chip demodulation signals from up to three antennas, antenna orthogonal placement, we can demodulate the data from the three coordinates x, y and z. Thus, even if the car's base station antenna is simple, economical loop antenna, but also allows no coupling to the smallest region. Identification device in the magnetic field in what direction, there is always an antenna capable of receiving a strong enough signal to cover the required scope of work. In addition, an external microcontroller to deal with the agreement, and respond to the three antenna to receive UHF (UHF) the identity of the query signal. Figure 2 is a block diagram of the three-dimensional antenna analog front-end chip-TMS37122. TMS37122 with up to three low quality factor of the antenna circuit is connected as shown. The three antennas can receive low-frequency signal from 125kHz to 135kHz, one antenna channel (RF1) the modulation function. This antenna can be used to frequency shift keying (FSK) technology to transmit low frequency data, and therefore compatible with existing transceiver modulation technique. The modulation function is commonly used in battery backup mode when the key battery power is low, the base station identification device through a magnetic field energy. The low-frequency carrier signal is higher than a certain threshold to trigger an internal control unit, in order to detect the three input channels RX1, the RX2 and RX3. A special protocol can achieve channel RXi combination / selection, and in a very wide scope of work to ensure that performance is improved. Internal trigger,Main products: car dvd and car gps and car dvd player are with good quality. the control unit has been monitoring the RF signal on behalf of the wake-up modes, only when the receiver is stored in the EEPROM of the device wake-up mode signal will be issued by the external microcontroller wake-up signal, then demodulated data transmitted to the micro- controller. In addition, the carrier clock signal recovery can be used as a time reference measured by the microcontroller, the standby power of this technology can minimize power consumption. The keyless entry system one of the key issues is to detect the location of the transceiver, especially distinguish it in the car or vehicle. The TMS37122 device provides a solution to the problem of complex built-in functionality.
Related Articles -
car gps, car dvd player,
|
Rate This Article  |
|
|
|
|
|
Do you Agree or Disagree? Have a Comment? POST IT!
| Reader Opinions |
|
|
|
|
|
|
|
|
|
| Author Login |
|
|
 |
Advertiser Login
ADVERTISE HERE NOW!
Limited Time $60 Offer!
90 Days-1.5 Million Views
|
|
TIM FAY
After 60-plus years of living, I am just trying to pass down some of the information that I have lea...more
|
|
|
|
|
ALEX BELSEY
I am the editor of QUAY Magazine, a B2B publication based in the South West of the UK. I am also the...more
|
|
|
|
|
STEPHEN BYE
Stephen Bye is a fiction writer. His most recent novels are a 5-book “The Developer” series which be...more
|
|
|
|
|
PAUL PHILIPS
For more articles, blog messages & videos and a free e-book download go to www.NewParadigm.ws your p...more
|
|
|
|
|
LAURA JEEVES
At LeadGenerators, we specialise in content-led Online Marketing Strategies for our clients in the t...more
|
|
|
|
|
LEVAL AINAH
I am an internet marketer and also an educator. My goal is to help others who are looking to improve...more
|
|
|
|
|
GENE MYERS
Author of four books and two screenplays; frequent magazine contributor. I have four other books "in...more
|
|
|
|
|
ADRIAN JOELE
I have been involved in nutrition and weight management for over 12 years and I like to share my kn...more
|
|
|
|
|
MICHAEL BRESCIANI
Rev Bresciani is the author of two Christian books. One book is an important and concisely written b...more
|
|
|
|
