GPS chip solution analysis
發(fā)布日期：2023-02-08To sum up, RF and fundamental frequency are two parts, including: microprocessor (Micro processor), low noise amplifier (LNA), digital section (Digital Section), RF section (RF Section), antenna (Antenna Element), GPIO and drivers, and microprocessor peripheral circuits (Processor peripherals) and other important components.
The integration of various GPS chip solutions in the market makes the GPS chip market face great changes. The first is "miniaturization". Looking back on the development history of GPS chips in recent years, with the integration of GPS and other products, and emphasizing that the size of terminal products should be light, thin, and short, it is an inevitable trend for GPS chips to become single chip systems. At present, manufacturers can divide GPS into RF or baseband single chips and integrate more functions.
In the RF chip part, many manufacturers have integrated amplifiers, filters, frequency reducers, frequency synthesizers and oscillators on one chip; In the baseband part, CPU, memory (DRAM, SRAM, Flash), Power Manager and Clock are integrated.
Therefore, we can see that the size of GPS chip is gradually shrinking, and the GPS chip has developed from a dual module to a single chip. In the future, GPS equipment products will be more and more vigorous, and the demand for chips will be greater and greater. In addition, GPS chips will also face the need for customization. In the past, most GPS chips were in the automotive market. At present, GPS chip applications are beginning to be used in mobile phones and PDAs, or special personal portable devices, such as trackers for the elderly and children. GPS chips may also be integrated with other functions, such as bluetooth and USB. Therefore, there will be more and more customized modules designed for special applications.
At present, the global GPS chip development is mainly invested by foreign manufacturers, such as SiRF, TI, Xemics, Freescale, STM and other large manufacturers, which have launched GPS chips. SiRF is the world's largest GPS chip manufacturer, with a complete product line and can provide a full range of solution products. This article will introduce several chips that are widely used in the GPS market at present, and provide a complete product analysis for their characteristics and architecture.
SiRF：starII LP
SiRF starII LP is a highly sensitive GPS chip solution. The range of powerful GPS functions that can be used includes: handheld device products, automobiles, navigation and AVL applications. If combined with high-performance GPS software, mobile consumer devices can be continuously used in any place for a long time. SiRF starII is currently one of the most power-saving chip products in the world. It can receive 12 satellites at the same time, in line with NMEA 0183 (v3.0) agreement.
. Model: SiRF starII LP
. Sensitivity: - 159dBm
Features: low power consumption, high efficiency, NMEA 0183 (3.0) compliance
. Size: 28mm × 30mm × 5mm
. Accuracy: PosiTIon: 15~20m
. Working voltage: 3.0V
. Receiving channel: 12 satellite channels
SiRF：starIII
It has a 140-pin GPS signal processor and a 50MHz ARM7TDMI processor, which enables OEMs to integrate multiple application functions. Because GSC3f integrates 4 million bits of flash memory, it does not need other components, so it can simplify the relevant circuit design from the GPS receiver to the circuit board.
In addition, SiRFstarIII also provides the TTFF fast first positioning function, and it takes up about 20% less hardware space than SiRF. It also saves power compared with the previous generation of SiRFstarII. In addition to the application of on-board navigation and handheld devices, other special applications, such as: ultra-small mobile phones, intelligent devices with limited power or digital cameras.
. Model: SiRF starIII
. Sensitivity: - 159dBm
Features: save power and simplify circuit design
. Size: 27.9mm × 20mm × 2.9mm
. Accuracy: Position: 10~20m
. Working voltage: 3.3V
. Receiving channel: 20 satellite channels
Sony：CXD2951
CXD2951 is designed in Sony's advanced RFCMOS block signal processing mode, with high sensitivity, minimum power consumption and high performance. And use miniature GPS module to print 14 × twenty-three × 1.8mm, passive antenna integrated with GPS module, verified by QS9000/TS16949 and other vehicles that the new LSI configuration is ideal for a wide range of location-based applications, such as automobiles, handheld devices, navigation, fleet management, and mobile computer processing technology equipment.
. Model: CXD2951
. Sensitivity: - 152dBm
. Features: short starting reaction time and power saving
. Size: 14mm × 23mm × 1.8mm
. Accuracy: Position: 5~15m
. Working voltage: 3.3V
. Receiving channel: 12 satellite channels
Nemerix：NJ1006＋NJ1030
In terms of today's technology level, the most successful GPS receiver uses two chips. Although products using single chip (single chip circuit) also exist, their performance cannot be comparable with those using dual chips at present. NemeriX makes full use of the advantages of SiGe (silicon and germanium) technology and uses standard CMOS technology suitable for dual-grain solutions. In typical applications, the receiver and processor can be used in combination with special system software.
. Model: NJ1006 (RF)+NJ1030 (Baseband)
. Sensitivity: - 152dBm
Features: low noise amplifier, voltage controlled oscillator and antenna detector
. Size: NA
. Accuracy: Position: 10~15m
. Working voltage: 2.2V
. Channel: 10 satellite channels
U-Nav：uN9018
U-Nav launched a low-cost, high-performance GPS receiver solution uN9018, including uN1008 CMOS RF front-end and a high-integration uN8130 baseband processor. The power consumption of this product under continuous GPS navigation is less than 55mW, which is suitable for low-power, battery-powered portable wireless applications.
UN9018 is a solution with multimode GPS software. It supports automatic, semi-automatic and single fix (A-GPS) modes. The single fix mode exceeds the 3GPP2 and 3GPP standards of mobile phones. It can simultaneously receive GPS and mobile phone voice and data signals. It has an on-chip frequency synthesizer that supports multiple reference frequencies. It allows mobile phone or PDA manufacturers to use on-board oscillators to save costs and reduce size
. Model: uN9018
. Sensitivity: - 156dBm
Features: receive mobile phone voice and data signals
. Size: NA
. Accuracy: Position: 10~20m
Working voltage: 2.2 ～ 5.5V
. Channel: 8 satellite channels
RFMD：RF8900
Bluetooth/GPS solution RF8900, which integrates bluetooth communication and GPS technology into a complete system. It is said that the size of this product is reduced by 20% compared with similar products, and the cost is reduced by 25%. RF8900 is a highly integrated system solution. While integrating Bluebud wireless technology and GPS navigation technology, it also has a very high signal sensitivity (- 155dBm), which is 5dBm higher than other products. Therefore, the tracking ability of RF8900 to GPS signals reaches - 155dBm, and the location update rate reaches 1 second.
This high sensitivity enables end users to locate themselves at any location, including various indoor and outdoor areas where GPS signals are weak, attenuated or blocked (such as trees, high-rise buildings, mountains and other environments). This unique solution also provides users with a reference design, including software, filter, memory, reference frequency, antenna, etc., which is used for all accessories of a complete Bluebud GPS system.
. Model: RF8900
. Sensitivity: - 155dBm
Features: integrated Bluebud communication
. Size: 32mm × 32mm × 8.9mm
. Accuracy: Position: 10~15m
. Working voltage: 3.0V
. Channel: 8 satellite channels
Xemics：XE1202
XE1202 transmitter and receiver chip. The biggest feature of this chip is "power saving". Although it can only receive 8 satellites at the same time, for the purpose of vehicle navigation, the full-function transceiver chip has absolutely no problem in accuracy. Its series groups are XE1202, XE1202HE1 and XE1202LE1.
Its functions are as follows: 433/868/915MHZ three-band international ISM band coverage, high sensitivity - 113dBm, low power consumption, can meet the requirements of low-power equipment, low operating voltage 2.7V, FSK modulation, maximum transmission power+5dBm, more channels, programmable frequency settings, especially to meet the special occasions requiring multi-channel operation, high integration, few peripheral components, basically no debugging, high-speed transmission speed 76.8kbit s Due to the design of low transmitting power and high receiving sensitivity.
. Model: XE1202
. Sensitivity: - 143dBm
Features: 433 ／ 868 ／ 915MHZ three-band international ISM frequency band
. Size: 29mm × 48mm × 16mm
. Accuracy: Position: 10~15m
Working voltage: 2.7 ～ 3.6V
. Channel: 8 satellite channels
Wangjiu Technology: PL6313
Wangjiu Technology launched the GPS PL6313 chipset, providing a high-performance, low-power and low-cost solution for mobile computing platforms requiring satellite positioning and tracking functions such as PDA, Tablet PC and Smart Phone.
The PL6313 chipset is mainly designed for low power consumption, small size and low cost of embedded GPS function. When embedded into the computing platform, the GPS navigation operation is directly completed by using the existing computing device and memory to reduce the cost. It can be used to capture the tracking GPS signal and generate the initial measurement value.
