SOLICITATION NOTICE
66 -- TRACKING AND DATA RELAY SATELLITE SYSTEM (TDRSS) SIMULATOR (TSIM)
- Notice Date
- 7/28/2003
- Notice Type
- Solicitation Notice
- Contracting Office
- NASA/George C. Marshall Space Flight Center, Procurement Office, Marshall Space Flight Center, AL 35812
- ZIP Code
- 35812
- Solicitation Number
- 8-4000020405
- Response Due
- 8/7/2003
- Archive Date
- 7/28/2004
- Point of Contact
- Gloria J. Coffey, Contract Specialist, Phone (256) 544-9187, Fax (256) 544-6041, Email gloria.coffey@msfc.nasa.gov - Amy B. Campbell, Contracting Officer, Phone (256) 544-8620, Fax (256) 544-9081, Email Amy.Campbell@msfc.nasa.gov
- E-Mail Address
-
Email your questions to Gloria J. Coffey
(gloria.coffey@msfc.nasa.gov)
- Description
- NASA/MSFC has a requirement for the Tracking and Data Relay Satellite System (TDRSS) Simulator (TSIM). NASA/MSFC intends to purchase the items from RT Logic, 1042 Elkton Drive, Colorado Springs, CO 80907, pursuant to the authority of FAR 6.302-1. No other contractor has the known capability to perform this effort. Only RT Logic fulfills and meets the Government's minimum requirements. Effort to be performed includes: General 1. RF Output Frequency: 2025-2120 MHz (TDRSS MA and SSA support) 2. RF Output level: -100 to +10 dBm 3. Tuning resolution: 1 Hz 4. Spurious outputs: ≤ -27 dBrc 5. Output connector: SMA or Type N (female) 6. Impedance: 50Ω Data Format 1. Input Data Rates: 100 bps to 300 kbps 2. Input Code: NRZ-L 3. Data Clock: Internal/External 4. Interface: TTL, 50Ω 5. Convolutional Encoding (command data only): Forward link subsystem shall be capable of convolutional encoding the command data (rate ?, K=7). G2 polarity shall be selectable. Modulation 1. Modulation: QPSK a. Command Channel [I Channel]: - PN spread, data modulo-2 added asynchronously to PN code - PN Generator: Gold Code, length 210?1 (See Ref. 1) - Chip Rate: 31 x F /(221 x 96), chip rate accurate to 0.01Hz b. Range Channel [Q Channel]: - PN code length: (210?1) x 256 - PN Generator: Truncated 18-stage shift register sequences (See Ref. 1) - Chip Rate: Synchronized to command channel PN code chip rate. - PN code epoch reference: All 1?s condition synchronized to the command channel PN code epoch (register initial state) - Q channel chips delayed from I channel by ? Tc . 2. Command to Range channel power ratio: 10:1 3. Carrier suppression: 30 dB minimum 4. Modulator phase imbalance (BPSK): ? 3 deg 5. PN code chip jitter (rms): ≤ 3 % 6. Range code epoch monitor output: a. The forward link subsystem shall generate a 1-10 mS pulse with a rising edge that is synchronous with the beginning of the range code shift register epoch (all 1?s) state. b. Monitor output: TTL into 50Ω Doppler Compensation 1. System shall be capable of receiving a text file containing a list of frequency values. 2. System shall be capable of continually stepping output frequency through each frequency in the list 3. Intermediate frequency steps shall be employed to generate a smooth frequency rate 4. Time to step from one frequency point to the next shall be ≤ 1 sec. 5. Frequency steps between frequency points in file shall be generated by linearly interpolating between the two steps 6. Frequency step time shall be ≤ 1 mS. Return Link Reception The TDRSS simulator receive subsystem shall be capable of correlating and demodulating data signals formatted as defined in this section. General 1. Input Frequency: 2200-2300 MHz 2. Frequency offset: Within ? 4 kHz of tuned frequency for acquisition, +/-174kHz for tracking after acquisition. 3. RF Input level: 0 to -40 dBm 4. Input frequency drift: < 70 Hz/sec for acquisition, +/- 380Hz/sec for tracking. 5. Carrier suppression: 30 dB minimum 6. Modulator phase imbalance (BPSK): ? 3 deg 7. Input Connector: SMA or Type N (female) 8. Impedance: 50Ω 9. VSWR: 1.5:1 10. C/N0 : ≥53dB-Hz for data rates less than 3 kbps, 18dB+10log(data rate)db-Hz for data rates between 3 kbps and 150 kbps (based on data rate of Q channel). This results in C/No = 70dB-Hz at 150 kbps. 11. Acquisition: Receiver shall acquire the PN code and demodulate suppressed carrier data within 20 seconds, and maintain lock when signal meets characteristics defined in items 1-10 preceding. The receiver shall provide the ability to guard against a ?false? lock. Additionally, if the signal degrades below the thresholds noted and the ?lock? is lost, the receiver shall resume acquisition mode and ?re-lock? once threshold levels return to specification. Modulation 1. Modulation Type: QPSK 2. I and Q channel configurations: Mode 1: a. I and Q data PN spread, data modulo-2 added asynchronously to PN code b. PN Generator: Truncated 18-state shift register sequence (see Ref. 1) c. Chip Rate (I & Q): 31 x F/(240 x 96), coherent with carrier, where F is in the frequency range stated above. d. The Q channel is delayed X + ? PN code chips relative to the I channel PN code epoch, where X is inherent in the method of generation (see Ref. 1 for method of generation). Mode 2: a. I and Q data PN spread, data modulo-2 added asynchronously to PN code b. PN Generator : Gold Code, length 211?1 (See Ref. 1) c. Chip Rate (I & Q): 31 x F/(240 x 96), coherent with carrier, where F is in the frequency range stated above. d. The Q channel is delayed by ? PN code chips relative to the I channel PN code. 3. I/Q PN code chip skew (relative to 0.5 chip): ≤0.01 chip 4. Q:I power ratios: 1:1, 2:1, 3:1, 4:1 Data Format 1. I and Q channel data relationship: Data streams on I and Q can consist of independent data streams, potentially with different bit rates. 2. Data Rates: 100 bps to 300 kbps ( I or Q) 3. Data code format: NRZ-L, M, or S 4. Convolutional Encoding a. I and Q data streams may or may not be convolutional encoded b. I and Q channels encoded independently c. Rate ?, K=7, G2 invert/non-invert selectable 5. Maximum consecutive symbols without a symbol transition: 64 6. Outputs: a. I and Q data and clock b. Return link code epoch monitor c. The return link subsystem shall generate a 100 microsec pulse with a rising edge that is synchronous with the reception of the return link PN code epoch (all 1?s) state d. Monitor output: TTL into 50Ω Self Test Capability The simulator shall include a capability to translate the output forward link signal to the return link band as a self test function. The self test capability shall include: 1. A frequency translator that multiplies the forward link output frequency by the ratio 240:221. The translator can be a stand alone component, which would be cabled to simulator during system checkout. 2. The forward link subsystem shall be capable of generating a mode 2 return link signal. This signal will be translated and input to the return link subsystem for system checkout. System Reference An external reference source shall not be required for the system to operate. However, the system shall be capable of using an external frequency reference source if higher stability is desired. External reference source shall be 5 or 10 MHz User Configurable Parameters The user shall be capable of configuring at a minimum the following simulator parameters from a GUI: ? User Code Assignment (1-85, per Ref. 1). Selection of the user code shall automatically configure the following parameters: o Forward link command channel Gold Code o Mode 1 return link PN pattern o Mode 2 return link Gold Code ? Forward link RF center frequency ? Forward link modulation: ON (modulating) or OFF (CW) ? Command data clock: Internal or external ? Command internal clock rate. ? Command channel convolutional encoding: ON/OFF ? Command channel convolutional encoder G2 symbol: Inverted/Non-inverted ? Return link mode: 1 or 2 ? Return link I channel Data Rate? ? Return link I channel data code conversion: NRZ-L, NRZ-M to L, NRZ-S to L ? Return link I channel Viterbi encoding: ON/OFF ? Return link I channel Viterbi encoding G2 symbol: Inverted/Non-inverted ? Return link Q channel data rate. ? Return link Q channel data code conversion: NRZ-L, NRZ-M to L, NRZ-S to L ? Return link Q channel Viterbi encoding: ON/OFF ? Return link Q channel Viterbi encoding G2 symbol: Inverted/Non-inverted Environmental The equipment shall operate in a ?general purpose? environment with the following minimum requirements: ? AC Power: 100-120V at 50-60 Hz ? Temperature: 10o - 40o C ? Relative Humidity: 10% to 80% (non-condensing) The Government intends to acquire a commercial item using FAR Part 12. Interested organizations may submit their capabilities and qualifications to perform the effort in writing to the identified point of contact not later than 4:30 p.m. local time on August 7, 2003. Such capabilities/qualifications will be evaluated solely for the purpose of determining whether or not to conduct this procurement on a competitive basis. A determination by the Government not to compete this proposed effort on a full and open competition basis, based upon responses to this notice, is solely within the discretion of the government. Oral communications are not acceptable in response to this notice. All responsible sources may submit an offer which shall be considered by the agency. An Ombudsman has been appointed. See NASA Specific Note "B". Any referenced notes may be viewed at the following URLs linked below.
- Web Link
-
Click here for the latest information about this notice
(http://prod.nais.nasa.gov/cgi-bin/eps/bizops.cgi?gr=D&pin=62#106772)
- Record
- SN00384912-W 20030730/030728213855 (fbodaily.com)
- Source
-
FedBizOpps.gov Link to This Notice
(may not be valid after Archive Date)
| FSG Index | This Issue's Index | Today's FBO Daily Index Page |