RSR Transcoder 2.0 RSR-T2020 GPS RF Transcoder Module with TCSAC

Board-level RSR Transcoder 2.0 module with TCSAC that converts M-Code, SAASM, INS and NMEA PNT inputs into legacy GPS L1/L2 RF signals.

Output Frequency: GPS L1 (1575.42 MHz), L2 (1227.6 MHz)
Code Type: GPS L1 C/A, L1 and L2 P-code
Power Level: -100 to -120 dBm
RF Output Connector: SMA, Female

Datasheet

Overview

The VIAVI RSR Transcoder 2.0 is a rugged, real-time system that converts modern Assured PNT inputs such as M-Code, SAASM, INS and other signals of opportunity into legacy-compatible GPS RF signals. It is intended for personnel who need navigation and timing in GPS/GNSS denied, degraded and disrupted space operational environments (D3SOE), where electronic warfare is used to jam and spoof the Global Positioning System.

Based on a patented methodology, the system includes a full-constellation GPS simulator that outputs standard GPS L1 C/A, L1 P-code and L2 P-code signals. The RSR-T2020 generates a GPS RF signal at configurable power levels that appears to a legacy receiver as a live-sky signal, so legacy systems can be upgraded by replacing the GPS antenna with the Transcoder without modifying internal hardware or software.

The unit accepts NMEA Position, Velocity and Time (PVT) inputs and processes them within milliseconds. This allows real-time conversion of PNT sources such as M-Code, SAASM, SBAS, Galileo, GLONASS and BeiDou into signals compatible with GB-GRAM, MicroGRAM, DAGR and similar receivers. An external 1PPS input enables time-transfer accuracy better than 5 nanoseconds, and BAE Systems (DAGR, MicroGRAM) and u-blox receivers are detected and configured automatically.

Software options

A factory-installed 100 Hz Refresh software option lets the Transcoder 2.0 accept PVT input data at up to 100 Hz over NMEA or SCPI and raise its internal simulation and RF output rate to 100 Hz for airborne, missile and high-speed vehicle platforms. An ICD-GPS-153 Interface software option enables control of ICD-GPS-153-compatible receivers such as the DAGR, including configuration of baud rate, output message set and 1PPS behavior, use of the Time Mark (8504) message as the PNT source, and retrieval of almanac, ephemeris and UTC corrections. GPSCon Controller, JLTerm and SimCon application software are available for download.

Key Features

Generates GPS L1 C/A, L1 and L2 P-code RF signals compatible with legacy receivers
Update rates up to 100 Hz
External 1PPS input enables time-transfer accuracy better than 5 nanoseconds
Automatic detection and configuration of BAE Systems (DAGR, MicroGRAM) and u-blox receivers
Designed for vehicle, airborne, and portable deployments
Supports covert or lights-out operation for tactical scenarios
Supports ICD-GPS-153 from military user equipment
Full-constellation GPS simulator based on a patented methodology
Configurable RF output power level appears to the legacy receiver as a live-sky signal
Legacy systems upgraded by replacing the GPS antenna, without modifying internal hardware or software
Accepts NMEA Position, Velocity, and Time (PVT) inputs and processes them within milliseconds
Converts M-Code, SAASM, SBAS, Galileo, GLONASS, and BeiDou sources into GB-GRAM, MicroGRAM, and DAGR compatible signals
Background monitoring of RF output power and RF signal quality
Tested in accordance with MIL-STD-810

Specifications

RF Output

Output Frequency	GPS L1 (1575.42 MHz), L2 (1227.6 MHz)
Code Type	GPS L1 C/A, L1 and L2 P-code
Power Level	-100 to -120 dBm
RF Output Connector	SMA, Female Output port for transcoded L1 and L2 signals; applies to models with and without enclosure

Spectral Purity

In-Band Spurious	< -33 dBc L1, ±20 MHz
Out-of-Band Spurious	< -80 dBm
Harmonics of L1	< -150 dBm

Internal GNSS Receiver

Monitoring Functions	Background monitoring of RF output power and RF signal quality

External Source Compatibility

Input Sources	Any source that outputs NMEA
Direct Receiver Control	Direct control of Rockwell Collins GB-GRAM, MicroGRAM SAASM GPS, and u-blox GNSS Receivers
PVT Input Update Rate	up to 100 Hz (NMEA or SCPI) 100 Hz input and RF output refresh requires the Transcoder 2.0 100 Hz Refresh Software Option (22186757-000); standard updates are 1 Hz or 10 Hz

Oscillator and Timing

10 MHz Output Signal Type	CMOS, disciplined by external 10 MHz or 1 PPS reference
1 PPS Output Signal Type	CMOS, disciplined by external 10 MHz or 1 PPS reference
1 PPS Output Accuracy	< 5 ns from external reference

Input/Output Connectors

RSR Interface Connector RSR-T2000, RSR-T2010, RSR-T2020, RSR-T2030	20-Pin Connector Models without enclosure only; carries 1 PPS input/output, RS-232 in/out, 10 MHz buffered output and OCXO lock signals
1 PPS Input	CMOS 3.3 V 1 PPS Reference Input from external reference or GNSS
1 PPS Output	+3.3 V GPIO Timing locked to oscillator
RS-232 In	RS-232 Serial Port RX Interface from external system towards PCBA for UART3 Mutually exclusive with USB-Serial port; connect only RS-232 OR USB Serial Port
RS-232 Out	RS-232 Serial Port TX Interface from PCBA towards external system for UART3 This port can also be used to update firmware in ISP-Mode
10 MHz Buffer Output	OCXO: 10 MHz buffered output from internal oscillator
OCXO Lock	CMOS 3.3 V References Internal Oscillator Lock Status

Power

Power DC Output	7.5 V – 36 V
Power AC Input	100 V to 240 V
Power Consumption	2.6 W Typical

Environmental

Operating Temperature RSR-T2000, RSR-T2010, RSR-T2020, RSR-T2030	-10°C to 70°C Without enclosure; tested in accordance with MIL-STD-810
Storage Temperature	-25°C to +85°C With or without enclosure
Relative Humidity, Operating	10% to 90% (non-condensing) at 40°C
Relative Humidity, Storage	10% to 95% (non-condensing) at 40°C
Altitude	0 to 55,000 Ft
MTBF	> 20,000 Hours at +40°C

Regulatory and Compliance

Regulatory Standards	CE/UKCA, RoHS/WEEE, REACH, CSA
Military Standards	MIL-STD-461, MIL-STD-810
Conducted Emissions	FCC 47 CFR Part 15, section 15.107 (b); RSS-Gen Issue 4 section 8.8; MIL-STD-461

Ordering

Catalog Number	22183329-000
Configuration	Transcoder 2.0 w/TCSAC Module variant, no enclosure

Mechanical

Weight	2.30 oz (65.2039 g)
Width	2.554 in (6.49 cm)
Depth (board only)	2.8 in (7.13 cm)
Depth (with connectors)	3.4 in (8.64 cm)
Height	1.03 in (2.61 cm)

Specifications are taken from the manufacturer's documentation. See the datasheet for complete and current values.

Applications

GPS/GNSS denied, degraded, and disrupted space operational environments (D3SOE)
Legacy GPS receiver integration with Assured PNT sources
Vehicle deployments
Airborne deployments
Portable deployments
Covert or lights-out tactical operation
Missile and high-speed vehicle platforms
M-Code, SAASM, and INS/IMU input conversion

Options & Accessories

Option	Description
22186757-000	Transcoder 2.0 100 Hz Refresh Software Option – Factory Installed — Enables the Transcoder 2.0 to accept and process PVT input data at up to 100 Hz (NMEA or SCPI) and to generate matching GPS RF outputs at a 100 Hz refresh rate, for airborne, missile, and high-speed vehicle platforms where 1 Hz or 10 Hz updates are insufficient.
22188232-000	Transcoder 2.0 ICD GPS 153 Software Option – Factory Installed — Enables communication and control of ICD-GPS-153-compatible receivers such as the DAGR: configure baud rate, output message set, and 1PPS behavior; use the Time Mark (8504) message as the PNT source; retrieve live almanac, ephemeris, and UTC corrections with periodic refresh.
22187160	Transcoder 2.0 Power DIN Mating Cable Assembly — AMPHENOL M8AS-03BFFM-SL7D01 Connector
22187161	Transcoder 2.0 12-pin DIN Communication Mating Connector — Bulgin PXMBNI12FIM12ASCPG9 Connector
22187162	Transcoder 2.0 20-Pin Breakout Cable Assembly