Axiom GPS Module

gps.jpg

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Description

The module is already RS-232 ready, no need for a level converter chip (MAX-232). For a serial connection to your PC all you need to do is apply power(+5vdc) and wire TX,RX, and ground to you PC. Once powered up the receiver will output NMEA at 4800,8,n,1. You can add a battery backup (3.6vdc) connected to pin 3. This will allow the receiver to lock onto a signal within 10 seconds. On first power up don't expect a lock for about 90 to 120 seconds.

The module has two rows of pins, the pin with the square pad is pin 1.
Thanks to Alan N5NA for the following diagram.

pinout.jpg

Parts for the J1 connector are available from: http://www.mouser.com
Housing P/N 538-511102050
Socket P/N 538-50394-8100

Documents

Conductor User Guide
Evaluation User Guide
GPS Message Specification

Software

Conductor

Specifications

General:

  • Standard Log Capacity 5000 position and event records in non-volatile memory
  • Optional Log Capacity 25000 position and event records in non-volatile memory
  • Discretes 4 Programmable as Input or Output

Architecture:

  • Channels 12 simultaneous, all-in-view<li> <li>Frequency L1 1575.42 MHz
  • Tracking C/A code & carrier
  • Flash ROM 256 k x 16
  • Static RAM 64 k x 16
  • Processor Speed Hitachi SH-1 at 12.288 MHz

Dynamics:

  • Altitude -1000 m to 18,000 m
  • Velocity 500 meters per second
  • Acceleration 4 g
  • Jerk 5 meters/second3

Acquisition:

  • Cold Start < 50 seconds (average)
  • Warm Start < 40 seconds (current position, time, and almanac)
  • Hot Start < 8 seconds (current position, time, almanac, and ephemeris)
  • Snap Start 3.5 seconds (average)
  • Reacquisition 100 milliseconds

Accuracy:

  • Position (SA on) 100 meters 2d RMS
  • Position (SA off) < 25 meter SEP
  • DGPS 1 to 5 meters
  • Timing, 1PPS (SA on) < 300 ns, dynamic
  • Timing, 1PPS (SA off) < 75 ns, dynamic
  • Receiver Sensitivity -143.5 dB-Hz

Physical:

  • Dimensions 41.91 x 71.88 x 8.76 mm (1.65 x 2.83 x 0.35 in)
  • Weight 19.84 g (0.7 oz)

Electrical:

  • Operating Voltage 5 ± 0.25 Vdc, 50 mVp-p (max)
  • Power Consumption: 180 mA (continuous on)

Environmental:

  • Operating Temperatures -40° to + 85° C
  • Storage Temperatures -55° to + 125° C
  • Operating Humidity 5% to 95% R.H., Non-condensing, @ + 60° C
  • Shock 20 g (11 ms saw tooth)
  • Vibration 4 g

20 pin Connector (J1) Pin out

PIN # I/O1 Signal Name Description
1 I ANT_PWR DC power to active antenna. Connect 5 or 3 volts, depending on the active antenna being used. Typically 20 to 30ma.
2 I VCC_5V Regulated 5.0VDC +/- 5% input power. 180mA typical.
3 I VBAT Battery backup input. 2V to VCC + 0.5 V. 10uA typical.
4 I N/C
5 I PBRESN Manual reset input (ground to reset receiver). Leave floating for normal operation. The minimum pulse width is 10 us resulting in a 140 ms reset signal.
6 I/O GPIO1 General purpose I/O 1
7 I/O GPIO2 General purpose I/O 2
8 I/O GPIO3 General purpose I/O 3
9 I/O GPIO4 General purpose I/O 4
10 I GND Ground
11 O TXA Port A Serial Transmit Data. VCC CMOS levels. GPS messages.
12 I RXA Port A Serial Receive Data. VCC CMOS levels. GPS commands.
13 I GND Ground
14 O TXB Port B Serial Transmit Data. VCC CMOS levels.
15 I RXB Port B Serial Receive Data. VCC CMOS levels. Differential GPS messages.
16 I GND Ground
17 I BOOT Reserved for re-programming flash
18 I GND Ground
19 O TIMEMARK 1PPS (one pulse per second) output. Normally low with 100ms high pulse once every second
20 I PWRONOFF Reserved for future implementation of Push-to-Fix

Minimum connections to make receiver work:

1 I ANT_PWR DC power to active antenna. Connect 5 or 3 volts, depending on the active antenna being used. Typically 20 to 30ma.
2 I VCC_5V Regulated 5.0VDC +/- 5% input power. 180mA typical.
3 I VBAT Battery backup input. 2V to VCC + 0.5 V. 10uA typical.
11 O TXA Port A Serial Transmit Data. GPS messages.
12 I RXA Port A Serial Receive Data. GPS commands.
13 I GND Ground

Summary of Features Installed:

  • Power = +5vdc
  • Data Connector = Bottom Feed
  • RF Connector = Right angle SMA
  • ROM & RAM Sizes = 4 Megabits Flash ROM; 1 Megabits RAM
  • Super Cap = NOT INSTALLED
  • Data = RS-232 Interface
  • Software = NMEA @ 4800 baud, 8 N, 1

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