Experiments with Trimble's Lassen IQ: Unterschied zwischen den Versionen

Version vom 2. August 2009, 01:48 Uhr

The Lassen IQ is a GPS receiver that is extremely power efficient. Here are some links:

• http://www.mikrocontroller.net/articles/GPS-Empfang_mit_Lassen_iQ

Here's a little theory on satellite navigation:

• http://lea.hamradio.si/~s53mv/navsats/theory.html

And here it is:

1 Experiments

1.1 APRS-Tracker

The challenge is to build a high performance tracker as power efficient and as space-efficient as it can be.

Ingredients:

• Trimble LassenIQ
• Trimble ANT
• OpenTracker SMT

1.1.1 The OpenTracker SMT

Here's a photo of the OpenTracker SMT. It's really small:

The tracker's inner values:

• Voltage: DC 6.5 to 28V unregulated or 5V DC regulated
• Current: 8 mA idle, 20 mA transmitting Max 200 mA @ 5 V available for GPS
• Modes: 1200 bps AFSK (send and receive); 300 bps AFSK, PSK31 (send only)
• Radio Connector: pin header
• Serial Connector: pin header
• Dimensions: 31mm x 18mm x 5mm
• GPS interface: NMEA in/out

Pinout:

Pin  Name   Funktion
1    5VIN     Geregelter 5-Volt-Eingang
2    RxD      RS-232 Data in der (vom GPS oder Computer)
3    1Wire    Dallas 1-Draht-Bus für externe Sensoren
4    AOUT     Audio-Ausgang an Radio
5    ADC5     Analog-Eingang
6    T1CH1    Timer-Kanal
7    ADC6     Analog-Eingang
8    RST      Reset (active low)
9    ADC7     Analog-Eingang
10   IRQ-     Transmit-now, Profil wählen, oder Zähler
11   ADC8     Analog-Eingang
12   ADC9     Analog-Eingang
13   AIN      Audio-Eingang von Radio
14   ADC4     Analog-Eingang
15   ADC3     Analog-Eingang
16   TXD      RS-232 Data aus
17   rot      rot LED-Ausgang
18   grün     grün LED-Ausgang
19   ADC2     Analog-Eingang
20   ADC1     Analog-Eingang
21   PTT      Push-to-talk-Signal an Radio
22   REGOUT   Regulator-Ausgang - 5 Volt
23   GND      Ground
24   REGIN    Regulator-Eingang - 6,5 bis 28 Volt

1.1.2 Pinouts for the LassenIQ

Pin-Nr.  	Funktion  	Beschreibung
1 	TXD A 	Sendeleitung der seriellen Schnittstelle
2 	GND 	Masse
3 	RXD A 	Empfangsleitung der seriellen Schnittstelle
4 	PPS 	Puls pro Sekunde
5 	reserviert 	nicht verbinden
6 	reserviert 	nicht verbinden
7 	Vcc 	3,3±0,3V (ca. 33mA)
8 	Batterie 	2,5-3,6V (ca. 19μA)