MTP (Multi-mode Integrated Transponder: USB/QPSK mode)
The external view is the same asthat of the 4 mode MTP.
| Registration date | 2/23/2011 |
|---|---|
| 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 | To be supplied after launch |
| Note | This component only furnishes the USB and QPSK functions of the 4 mode MTP. |
Manufacturer
NEC Space Technologies, Ltd.
1-10, Nissin-cho, Fuchu, Tokyo, Japan
https://www.necspace.co.jp/en/index.html
Features
- This MTP operates in the two modes as described below, and flexibly satisfies user requirements.
■ USB for launch phase and emergency operations
■ QPSK for high data rate transmissions
■ SSA for intersatellite communications
■ CDMA for interference resistant communications - Range measurements
Tone ranging and PN ranging are provided (USB). - Automatic mode transition function
The automatic mode transition function is provided for satellite emergency cases.
Applications
Communications between space and ground stations
- Receiving telecommands
- Transmitting telemetry data
- Ranging
Specifications
| Property | Specification | |
|---|---|---|
| Physical characteristics | Dimensions | 120 mm x 201 mm x 291 mm |
| Weight | 3.6 kg for LEO 4.0 kg for GEO |
|
| Power consumption | max. 39 W (Tx+Rx), ≦14.8 W (Rx only) |
| Property | Specification | |
|---|---|---|
| Receiver characteristics | Command modulation | PCM-PSK/PM, QPSK/BPSK |
| Receiver carrier frequency | Select one frequency in the range of 2025 to 2110 MHz | |
| Command bit rate | USB : 500 bps to 4 kbps (select one rate) QPSK : 512 kbps (Fixed) |
|
| Dynamic range | USB : -120 to -40 dBm QPSK : -90 to -40 dBm |
|
| Carrier acquisition level | USB : -110 to -40 dBm | |
| Command threshold | USB : -100 to -40 dBm QPSK : -90 to -40 dBm |
|
| Noise figure | ≦2.3 dB | |
| Carrier frequency band | USB : Uplink frequency ±150 kHz QPSK : Best Lock Frequency ±1400 Hz |
|
| Tracking range | ±150 kHz |
| Property | Specification | |
|---|---|---|
| Transmitter characteristics | Telemetry modulation | PCM-PSK/PM, PCM-PM, QPSK |
| Transmitter carrier frequency (Ft) | Select one frequency in the range of 2200 to 2290 MHz | |
| Telemetry bit rate | PCM-PSK/PM : 500 bps to 60 kbps PCM-PM : 8.192 to 65.536 kbps QPSK : 1 or 2 Mbps |
|
| Modulation index | 1.1 radians (0-p) ±10% | |
| Frequency stability | ≦±2 ppm (Initial setting) ≦1 × 10-9 (rms)/sec (Short term stability) ≦±1 ppm/year (Long term stability) ≦±5 ppm (Temperature stability) |
|
| Carrier acquisition level | USB : -110 to -40 dBm | |
| Output power | Hi (USB Hi and QPSK) Low (USB Lo) |
