Video: Smartphone chips will track you down to 30cm in 2018
2024 Author: Seth Attwood | [email protected]. Last modified: 2023-12-16 15:55
Poadcom is pleased to announce the development of the commercial market's first dual frequency (L1 and L5) GNSS receiver, the BCM47755 chip, which will be available to phone manufacturers in 2018. The first samples of the chip are ready, and now the company is preparing to start mass production.
In today's receivers, GPS signal reception accuracy is only 5 meters, which sometimes leads to awkward situations. For example, a GPS navigator in a car may incorrectly detect when you have already driven through a bend and give the wrong recommendation. New chips ensure accuracy 30 cm … Equally important, these receivers will be better able to pick up the signal in difficult conditions, for example, on city streets near tall buildings. And finally, they consume half the power of current generation microcircuits.
The BCM47755 is already included in the design of several smartphone models intended for release in 2018, but poadcom does not say which ones.
The receiver is capable of simultaneously receiving the following signals from global navigation systems (GNSS):
- GPS L1 C / A
- GLONASS L1
- BeiDou (BDS) B1
- QZSS L1
- Galileo (GAL) E1
- GPS L5
- Galileo e5a
- QZSS L5
In addition to GPS, the European Galileo, the Japanese QZSS, and the Russian GLONASS are also supported.
How did you improve the quality of reception in the city? The fact is that all GPSS satellites, even the oldest generation, transmit the L1 signal, which contains the satellite coordinates, exact time and identifier. However, the new generation of satellites not only transmit L1, but also the more complex L5 signal on a different frequency than the standard L1 signal. Until recently, there were not enough L5 satellites in orbit to actually be used in practice. But in 2015 and 2016, they launched enough such satellites, and now there are about 30 of them, taking into account those that hang only over Japan and Australia. Still, now, even in a narrow window of the sky in an urban environment, you can finally see six or seven of these satellites, says a spokesman for poadcom. Therefore, now the moment has come when it is possible to produce a new generation receiver with increased accuracy, working with the L5 signal (the next generation satellites will provide centimeter accuracy at all).
The BCM47755 microcircuit is first fixed on the satellite by the L1 signal, and then refines the calculated position by the L5 signal. The frequency of the latter is more preferable for difficult urban conditions, because this signal is less prone to distortion from multiple reflections.
In a city, the receiver simultaneously receives a signal directly from a satellite and its reflections from buildings. That is, it receives several identical signals at slightly different times, due to which a kind of signal blob is formed. The receiver looks for a signal of maximum strength in order to fix the reception time, but if the signals partially overlap each other, then the calculations are not very accurate. Well, the L5 signals are so short that it is almost impossible for the reflections to mix with the original signal. The poadcom chip additionally uses the phase of the carrier signal to further increase accuracy, explains IEEE Spectrum magazine.
In fact, there are already systems on the market that use the L5 signal and increased GNSS accuracy, but these are usually industrial systems, they are used, for example, in oil production. The BCM47755 chip will be the first mainstream IC to accept both L1 and L5 at the same time.
The diagram shows the number of new generation satellites transmitting the L5 signal and schematically explains why the receiver needs to receive a signal on two frequencies L1 and L5
The new poadcom chip features several innovations, including a new architecture using ARM's big. LITTLE design. It is a dual-processor architecture, where one CPU has lower performance and lower power consumption, while the other processor is larger and more powerful. In this case, these are the Cortex M-0 and Cortex M-4 processors.
Additional information about the BCM47755 will be announced at the ION GNSS + 2017 conference on September 27, 2017.
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