ORG4572-R01-TR2 datasheet(15/40 Pages) ETC

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Multi Spider - ORG4572 Datasheet

Revision 3.0

November 23, 2014

14. PERFORMANCE

14.1. ACQUISITION TIME

TTFF (Time To First Fix) – is the period of time from the module’s power-up till position estimation.

14.1.1. HOT START

Hot Start results either from a software reset after a period of continuous navigation or a return

from a short idle period that was preceded by a period of continuous navigation.

During Hot Start all critical data (position, velocity, time, and satellite ephemeris) is valid to the

specified accuracy and available in RAM.

14.1.2. SIGNAL REACQUISITION

Reacquisition follows temporary blocking of GNSS signals.

Typical reacquisition scenario includes driving through tunnel.

14.1.3. AIDED START

Aided Start is a method of effectively reducing TTFF by providing valid satellite ephemeris data.

Aiding can be implemented using Ephemeris Push™, CGEE™ or SGEE™.

14.1.4. WARM START

Warm Start typically results from user-supplied position and time initialization data or

continuous RTC operation with an accurate last known position available in RAM.

In this state position and time data are present and valid, but satellite ephemeris data validity

has expired.

14.1.5. COLD START

Cold Start occurs when satellite ephemeris data, position and time data are unknown.

Typical Cold Start scenario includes first power application.

TABLE 5 – ACQUISITION TIME

Notes:

1. EVK is 24-hrs. static under signal conditions of -130dBm and ambient temperature of +25°C.

2. Outage duration ≤ 30s.

OPERATION¹

MODE

VALUE

UNIT

Hot Start

< 1

Aided Start

< 10

Warm Start

GPS + GLONASS

< 26

GPS

< 32

Cold Start

GPS + GLONASS

< 27

GPS

< 35

Signal Reacquisition

< 1

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