Impulse pulse has high positioning accuracy. Using UWB radio communication, it can accurately locate indoors and underground, while GPS positioning system can only work within the visual range of GPS positioning satellite. Different from the absolute geographical position provided by GPS, the ultra short pulse locator can give the relative position, and its positioning accuracy can reach 10 cm level.
2. Large system capacity
There are many labels that can work at the same time and have high capacity. The bandwidth used by UWB is more than 1GHz, or even up to several GHz, so the duration of each UWB signal sent is very short. The increase of bandwidth makes the improvement of channel capacity far greater than the effect of the increase of signal power, which is the theoretical mechanism of UWB technology.
3. High speed data transmission
UWB directly realizes modulation by using time-domain pulses (several nanoseconds) at the starting and landing points. UWB transmission places the modulation information process on a very wide frequency band, and determines the frequency range occupied by the bandwidth by the duration of this process.
The UWB time domain signal is narrow, which enhances the time resolution. The time difference between the received multipath reflection delay signal and the direct signal is generally greater than the pulse width. Therefore, the signal is separable in time domain. The time difference of 7ns in the above example is enough to complete the transmission of UWB direct signal, so the system can quickly extract the direct signal and realize accurate positioning.
4. Strong multipath resolution
UWB has high resolution due to its very high working frequency and very low duty cycle. Narrow pulse multipath signals are not easy to overlap in time, and it is easy to separate multipath components, so it can make full use of the energy of transmitted signals. Experiments show that for the multipath environment where the multipath fading depth of conventional radio signal is 10 ~ 30dB, the fading of UWB signal is less than 5dB at most.
5. Good concealment
The spectrum of UWB is very wide and the energy density is very low, so the security of information transmission is high. On the other hand, due to the low energy density, the interference of UWB equipment to other equipment is very low.
6. Strong anti-interference ability
The gain of UWB spread spectrum processing mainly depends on the duty cycle of the pulse and the number of pulses used to transmit each bit. The duty cycle of UWB is generally 0.01-0.001, which has much higher processing gain and strong anti-interference ability than other spread spectrum systems.
7. Low power consumption
UWB system uses intermittent pulses to send data. The pulse duration is very short, generally between 0.20ns-1.5ns, with a very empty duty cycle. The power consumption of the system can be very low. In high-speed communication, the power consumption of the system is only a few hundred μ W - tens of MW. The power of civil UWB equipment is generally about 1 / 100 of that required by traditional mobile phones and about 1 / 20 of that required by Bluetooth equipment. Therefore, the battery life of UWB equipment has great advantages over traditional wireless equipment.
8. Low cost
UWB wireless communication system has simple structure and low equipment cost. In addition, in the use of products including UWB tags and UWB base stations, the most concern is system stability. The daily operation cost and the recovery cost affected by typhoon and rainstorm will be added to the price when the product is sold. In this regard, pinplatinum technology has formed a set of self networking and self maintenance product design, which can effectively reduce the maintenance cost and optimize the input cost.
9. Wireless synchronization
Wireless synchronization is that each UWB positioning base station continuously exchanges its own team information with other base stations to finally achieve and maintain global coordination. The wireless synchronization method depends on the measurement time accuracy of UWB. The higher the time accuracy is, the smaller the time error between the two base stations is, the higher their time synchronization degree is. The advantage of wireless synchronization is that there is no wired connection between base stations, so the deployment of UWB positioning system is less difficult and the cost is low.