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Next Generation GPS Reciever

Next Generation GPS Reciever
Registration date
(updated date)
6/20/2014
(10/3/2014)
JAXA development group Research Unit I, Research and
Development Directorate
View diagram See Attachment 1
Environmental resistance See Attachment 2
Patent number
(publication number)
N/A
Reference N/A
Satellite and launch date Flight models will be launched on
ASTRO-H in FY2015
Note N/A
Manufacturer

NEC Corporation
5-7-1 Shiba, Minato-ku, Tokyo, Japan
http://www.nec.co.jp/

Features

Next Generation GPS Reciever possesses three antenna inputs and 88-channel port which enables the reciever to output its position continously even under the condition that spacecraft changes its attitude or orbit dynamically. The upgraded software and direct sampling apporach allowed the reciever to determine its position within the accuracy of 1.6 m 3 drms.
Compared with general spaceborne GPS reciever, this GPS reciever has advantage in its size, mass, and power consumption owing to the CMOS ASIC based RF frontend and Multi-chip module.

Applications

This GPS reciever is suitable for spacecrafts or satelites which require the precise orbit determination and orbit control.

Specifications

Item Specification
Configuration GPSP (main package), GPSL (LNA),
GPSA (antenna)
Number of antennas Maximum of 3 antennas
Number of channels L1C/A : 36 ch (Max)
L2C (C/A) : 36 ch (Max)
L2P (Y) : 16 ch (Max)
Types of signals L1C/A, L2P (Y), L2C (C/A)
Size GPSP : 96 × 218 × 155 (nom)
GPSL : 74 × 158.5 × 45.5 (nom)
GPSA : Φ 130 × 84 (nom)
Mass GPSP : 1.95 kg
GPSL : 0.54 kg/unit
GPSA : 0.46 kg/unit
Power consumption GPSR (Non-off mode) : 20.7 W
GPSR (off mode) : 0.5 W
Signal power L1C/A : -133.9 dBm to -112.0 dBm
L2P (Y) : -138.7 dBm to 114.0 dBm
L2C (C/A) : -135.2 dBm to -111.0 dBm
Measurement accuracy
(1σ)
C/NO
L1C/A : 46 dBHz
L2P (Y) : 43 dBHz
L2C (C/A) : 46 dBHz
L1C/A
pseudo-range
<0.4 m
L2P (Y)
pseudo-range
<1.1 m
L2C (C/A)
pseudo-range
<0.5 m
L1C/A
delta-range
<1.0 mm
L1C/A
carrier-phase
<0.7 mm
L2P (Y)
carrier-phase
<1.9 mm
L2C (C/A)
carrier-phase
<1.3 mm
Antenna coverage L1 frequency Minimum gain >-4 dBi
(within the off-boresight of 80 deg)
Maximum gain <+8 dBi
(within the off-boresight of 80 deg)
L2 frequency Minimum gain >-5 dBi
(within the off-boresight of 75 deg)
Maximum gain <+8 dBi
(within the off-boresight of 75 deg)
Direct navigation
(Single frequency observation)
Position rss <2.3 m
Velocity rss <0.0078 m/s
Time ±10 ns
Direct navigation
(Dual frequency observation)
Position rss <1.9 m
Velocity rss <0.0024 m
Time ±10 ns
Bias error calibrating navigation
(Single frequency observation)
Position rss <2.1 m
Velocity rss <0.0059 m/s
Time ±10 ns
Bias error calibrating navigation
(Dual frequency observation)
Position rss <1.6 m
Velocity rss <0.0082 m/s
Time ±10 ns

* navigation accuracy is evaluated on the basis of 3 Drms