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The new product is a combination between a GPS receiver from FALCOM based on the newest GPS-chip from SiRF and the Quadrifilar Helix antenna from Sarantel with in the dimension of the Sarantel Geohelix-S-antenna. The antenna is tightly integrated with other antennas, e. g. Bluetooth/GPS-receivers or GPS/GSM mobile phones. The orientation of the device is random. As a dielectrically loaded antenna, the complete device acts its own filter, attenuating signals from common GSM and ISM frequencies by as much as 30 dB without external filtering.
The integrated GPS receiver is based on the newest GPS Navigation engine from SiRF, the GSC3LTf. This chip contains the industry loading SiRFstarIII GPS DSP core in 90 nm process technology operating at 1.2 V. 4 on-board voltage regulators and the integrated Power On Reset reduces solution footprint. The device contains also a LNA with a noise figure of 0,7 dB and a gain of 18 dB.
A SAW filter increase the attenuating against signals from GSM and ISM frequencies. Beside the integrated 4 Mb program flash for customized software, the GSC3LTf has a 4 Mb ROM available for masking stable firmware. The TCXO will a frequency stability of 0,5 ppm allows a sensitivity of -159 dbm. The small size, the high sensitivity and the power consumption from only 27 mA at 3.4 V (under 10 mA in Trickle Power Mode) providing manufactures of cellphones, PDAs and other portable and wireless devices a smaller design with extended battery life.
| GPS receiver | tracking: L1, CA code, 20 channel max. update rate 1 Hz max. altitude / velocity <60.000 ft / < 1.000 knots protocol support NMEA, SiRF binary |
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| Time to first position (TTFF) | hot start: <4 sec average (23 dbHz sensitivity) warm start: <35 sec average (28 dBHz sensitivity) cold start: <45 sec average (16 dbHz sensitivity) |
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| GPS datum | WGS-84 | ||
| Processing core | ARM7/TDMI, 90 nm, 1.2 V memory: 4 Mb Flash, 4 Mb ROM |
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| Electrical characteristics | power supply: 3.3 V - 5.5 V power consumption: 90 mW (3.3 V) full power 30 mW (3.4 V) trickle power (1 sec) |
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| Antenna | quadrifiliar helix frequency 1575.42 MHz gain -3.5 dBic efficiency 23% total spherical efficiency 45% upper spherical beamwidth 120 degrees VSWR < 2.0 : 1 |
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| Dimensions (Antenna & GPS receiver) |
length 50.8 mm width 14.8 mm helix diameter 13.2 mm |
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| Required space on customers application board |
length 23 mm width 16 mm |