Could you suggest a chipset for an Indoor GPS System?

Which model of transceiver (or transmitter/receiver) chipset do you suggest for an Indoor GPS System with the following characteristics?

I will have "4 receiver and 1 transmitter" or "5 transceiver" .


- RSSI (Received Signal Strength Identificator)
- Embeeded microcontroller
- Around 10 dbm Output Power
- 400-500 MHz Frequency Range
- 3 to 5 V DC Supply
- Low peak current ( around 5 mA)
- Range (3-100 m)

Thanks for your help...

Try this www.rfsolutions.co.uk they have many modules, many of these modules will cover your requirements

Did you chose which INDOOR GPS module that you will use, I am trying to find an Indoor GPS receiver works without a clear view of the sky ( not AGPS), can you help me to find some module?

Thanks

Hi,
you try ChipSet ATR0621 with SuperSense
http://www.u-blox.com/products/a4products.html

Ultra low power consumption: 62 mW
Optional SuperSense Indoor GPS
A-GPS and Autonomous GPS operation,
AssistNow™ ready
External bus interface for Flash EPROMs
Minimum bill of material
4 Hz position update rate
1 USB and 2 UART ports

ATR0621: 100 Pin BGA, 9 x 9 mm
ATR0601: 24 Pin QFN, 4 x 4 mm
ATR0610: 6 Pin PLLP, 1.6 x 2 mm
Features:
16 channel ANTARIS 4 positioning engine
Supports DGPS, WAAS, EGNOS and MSAS
Power saving modes
5 μA backup current
No external Flash EPROM required for standard GPS functionality
SPI Master & Slave (Suitable for optional serial EEPROMs)
Real-Time Clock (RTC)
Supports passive and active antennas
Antenna short and open circuit detection and protection
Operating temperature range: -40 to 85°C
RoHS compliant (lead-free)
Semiconductor technology provided by Atmel

Hi,

I'm having some trouble finding a DGPS module for indoor aplication, and I was wondering if someone can help me.


Thanks for all,
André (Portugal)

Hi,
what leads you to believe indoor GPS is at all possible? the satellite signals are far weaker than GSM signals from local cell towers that do/can find a circuitous path into a building,but a GPS needs two of more satellite signals to establish a correct phasing/time between them, reflected signals just hugely throw out the accuracy.
Open sky is a requirement I would have thought, unless you know something else ?

"what leads you to believe indoor GPS is at all possible?"

Perheps the answer is on changing the signal near the buildings, but I'm just guessing. The problem arrising from cell tower signals is the distance travelled by the gprs/gsm signal that changes where it finds obstacles, of course you'll have always acess to it in a building but the uncertainty is very high, and for the purpose intended it's not acceptable.