What Is a Bluetooth® GPS Receiver?

Bluetooth GPS is a kind of GPS signal receiver. It can process the received GPS data and send it to mobile phones, PDAs, computers and other devices through Bluetooth wireless technology to assist positioning. The emergence of Bluetooth GPS can enable ordinary digital devices to have positioning functions.

Bluetooth GPS

Bluetooth GPS

In the Android mobile phone platform, the Bluetooth interface was introduced only to Android 2.0. During development, you need to test the real machine. If you need data transmission, you also need two machines. In addition, Bluetooth requires hardware support, but general smart phones will have this support, especially Android-based phones.

When officially developing Android Bluetooth, you need to add the corresponding permissions in AndroidManifest.xml in the Android project:

1. <uses-permission android: name = "android.permission.BLUETOOTH_ADMIN" />

2. <uses-permission android: name = "android.permission.BLUETOOTH" / >

This is the world's first wireless GPS system with built-in antenna and rechargeable lithium battery. It weighs only 60 grams (including the battery) and has the size of a normal business card (9 × 5 × 1.7 cm). 8 hours. It is connected to a host with Bluetooth through a Bluetooth virtual serial port , so that the existing GPS software can be used directly without modification (existing equipment can be extended with a USB or CF card Bluetooth interface by only 300 yuan). Because this device does not need to install any driver on the host, it can be used in multiple operating systems: Windows CE (Pocket PC, SmartPhone), Android, iOS, PALM, BlackBerry, JAVA, Windows 98/2000 / XP, Linux, etc All hosts with Bluetooth devices.

Common brands are: Magellan, Holux, Rikaline, Nokia, etc.

Bluetooth technology is an open standard for wireless data and voice communication. It is based on a low-cost, short-range wireless connection and establishes a special connection for the fixed and mobile device communication environment. If Bluetooth technology is introduced into mobile phones and portable computers, you can remove the annoying connection cable between the mobile phone and the portable computer and establish communications wirelessly. Printers, PDAs, desktop computers, fax machines, keyboards, joysticks, and all other digital devices can be part of a "Bluetooth" technology system. In addition, Bluetooth wireless technology also provides a universal interface for existing digital networks and peripherals to form a group of personal special connected devices far from the fixed network.

Bluetooth technology is in the global 2. 4GHz ISM (industrial, scientific, medical) frequency band, and the data rate of Bluetooth is 1Mb / s. Theoretically speaking, the technology operating in the 2.45GHz ISM band can connect devices within 30m to each other, and the transmission rate can reach 2M / s, but it is actually difficult to achieve. The concept of plonk and play of Bluetooth technology is applied, which is a bit similar to the concept of plug and play. Once any Bluetooth technology device finds another Bluetooth technology device, it can establish a connection immediately without any setting by the user, which can be explained Into "out of the box". This advantage is even more obvious in a very noisy radio environment.

Another great advantage of Bluetooth technology is that it uses a globally unified frequency setting, which eliminates the obstacle of "national borders". In the field of cellular mobile phones, this obstacle has troubled users for many years.

In addition, the ISM band is a band that is open to all radio systems, so using one of them will encounter unpredictable sources of interference. For example, some home appliances, cordless phones, car room door openers, microwave ovens, etc. may be interference. To this end, Bluetooth technology has specifically designed a quick confirmation and frequency hopping scheme to ensure link stability. Frequency hopping technology is to divide the frequency band into several hop channels. In one connection, the radio transceiver continuously hops from one channel to another according to a certain code sequence. Only the sending and receiving parties communicate according to this law. It is impossible for other interference to interfere according to the same law; the instantaneous bandwidth of frequency hopping is very narrow, but this narrow band or multiples of the frequency band is expanded by the spread spectrum technology, so that the possible impact of interference becomes very large. small. Compared with other systems working in the same frequency band, Bluetooth has faster frequency hopping and shorter data packets, which makes Bluetooth technology more stable than other systems.

It is mainly used for positioning and navigation of ships, cars, airplanes and other moving objects. E.g:

1. Ocean navigation and port diversion

2. Aircraft route guidance and approach landing

3. Autonomous Navigation

4. Ground Vehicle Tracking and City

   Bluetooth GPS technology supports point-to-point and point-to-multipoint connections. Several piconets can be connected together, and each piconet is identified by frequency hopping sequence. All users of the same piconet are synchronized with this frequency hopping sequence. Its topology can be described as a "multi-piconet" structure.

   In a "multi-piconet" structure, in the case of 10 independent piconets with full load, the full-duplex data rate exceeds 6Mb / s.

   Voice

   Voice

   
   1. The Bluetooth GPS receiver model is compact, and the appearance of the new product is more beautiful. Some models of the Bluetooth GPS receiver are also waterproof.

   Functions.
   2. The Bluetooth GPS receiver can be placed where the signal in the car is stronger, but the CF card GPS receiver cannot be placed at will.
   3. Most of the Bluetooth GPS receivers are connected with PDA or laptop or smartphone in the car, but if you occasionally need to use it by hand, it is also

   More convenient, you can put the Bluetooth GPS receiver in your pocket or bag without worrying about bumps.
   4. Compared with the handheld or car GPS receiver, the Bluetooth GPS receiver receiver is cheaper, the map resources are more extensive, and the current market can be used.

   Most map software is highly compatible.
   5. There are many laptops, PDAs and smart phones with Bluetooth interface on the market, so now besides handhelds, Bluetooth GPS receivers

   Is currently the most used GPS solution.

   
   1. Because the Bluetooth GPS receiver is connected to the host using a Bluetooth interface, turning on Bluetooth for a laptop or PDA or smartphone will increase the power consumption.

   Actual use time will be shortened. The solution is to configure a cigarette lighter car charger or a car inverter (transformer) for a PDA or notebook or smartphone.
   2. Since it is a Bluetooth GPS receiver, it is naturally inseparable from the Bluetooth connection. Although the Bluetooth chips used by various companies are similar, the finished products are

   Accept the test of compatibility and stability. There may be compatibility issues with older Bluetooth GPS receivers and PDAs, but newer models

   This has improved a lot.

   Car GPS system is very popular now, it allows many riders to enjoy the convenience brought by the global satellite positioning system for a small amount of money.

   To determine the GPS solution, we must consider from the following aspects.

   1.GPS chip

   The most critical of navigation accuracy is the accuracy and algorithm of receiving satellite signals. The satellite reception performance is mainly determined by the GPS chip. The GPS chip is equivalent to the computer's CPU. Now the mainstream is Sirf (Serif) three generation chips. With 20 satellite channels (Sirf II has 12 channels). Others include sony chips and Swiss RFMD chips. The effect of these chips in actual use is significantly different from that of sirf.

   2.GPS power

   When people use GPS, they are usually in the car or outdoors, and sometimes the navigation time is longer (such as long-distance travel). Therefore, when choosing GPS, pay attention to the power of the GPS or the capacity of the battery.

   For the car, the general Bluetooth GPS and all-in-one have car chargers.

   When hiking, the battery design of each product is different: some use the same battery as Nokia batteries, so that Nokia mobile phone users have a lot of battery backup. Some use large-capacity batteries. Some simply have a dry battery box that can be connected externally.

   These can solve the power problem, the key depends on which one is more suitable for you.

   3.GPS antenna

   GPS antenna can enhance the receiving ability and expand the receiving range at the same time. For example, no signal is received in the house, and the antenna can guide the outside.

   Sirf's third-generation GPS does not use a GPS antenna in most cases. Metal-laminated cars are generally not needed. However, in special cases, such as bad weather conditions and high-rise building obstructions, you can purchase an antenna as the backup. When the signal is good, installing the antenna can also improve the signal strength.

   4, GPS product characteristics

   It can be said that each GPS product will have its focus when it is designed. One product cannot be perfect. For example, some machines focus on cost performance, some focus on small and stylish, beautiful, some focus on functional diversity, and some use large capacity batteries.

   Therefore, when choosing, you also have to choose according to your actual needs, like types and how much you plan to invest.