GPS Waveform Generator

GPS signal generator (traditional L1 and L2, upgraded L1C, L2C and L5).

blockType: GPSWaveformGenerator

Path in the library:

/Satellite Systems/Waveforms/GPS Waveform Generator

Description

Block GPS Waveform Generator It is a Global Positioning System (GPS) signal generator that supports the following GPS signals:

Traditional L1 and L2 — used when for the parameter Signal Type the value is specified legacy.
Upgraded L1C — used when for the parameter Signal Type the value is specified l1c.
Upgraded L2C — used when for the parameter Signal Type the value is specified l2c.
Upgraded L5 — used when for the parameter Signal Type the value is specified l5.

Ports

Output

# Y — generated GPS signal
the matrix

Details

The generated GPS signal returned as a matrix. The number of columns of the output signal is the same as the number of columns in the input signal. The number of lines of the output signal is defined as , where

— the duration of the input bits, which depends on the type of signal being generated:
- 0.01 — if the parameter Signal Type it matters l1c or l5;
- 0.02 — if the parameter Signal Type it matters legacy or l2c;
— the sampling rate set in the parameter Sample Rate.

Data types	`Float64`
Complex numbers support	Yes

Input

# Nav — navigation data
the matrix

Details

Navigation data set by one of the options:

The data matrix is sent to the input port Nav — the number of columns must be equal to the length of the parameter PRNID since each column corresponds to PRNID. The number of rows represents the number of bits of navigation data.
The data matrices are sent to the input ports LNav and CNav — use this option if for the parameter Signal Type the value is set l2c and the checkbox is set Enable civil navigation message. Port LNav — bits of the traditional navigation message, port CNav — bits of the civil navigation message. The data sizes in these ports must be the same.

If for the parameter Signal Type the value is set l2c and a flag Enable civil navigation message If not set, the block assigns the same value to both LNAV and CNAV.

Data types	`Int32`, `Int64`
Complex numbers support	No

Parameters

Main

# Signal Type — the type of baseband signal being generated
legacy | l1c | l2c | l5

Details

The type of baseband signal generated, set as:

legacy — Use this value to generate a traditional L1 or L2 signal.;
l1c — use this value to generate an upgraded L1 signal;
l2c — use this value to generate an upgraded L2 signal;
l5 — Use this value to generate an upgraded L5 signal.

Values	`legacy` \| `l1c` \| `l2c` \| `l5`
Default value	`legacy`
Program usage name	`SignalType`
Tunable	No
Evaluatable	No

# Enable civil navigation message — enable the civil navigation message
Logical

Details

Enable the civilian navigation message port.

When this option is selected, two input ports are used: LNav and CNav.

Dependencies

To use this parameter, set for the parameter Signal Type meaning l2c.

Default value	`false (switched off)`
Program usage name	`CNav`
Tunable	No
Evaluatable	No

# PRNID — satellite pseudorandom code index
Scalar / array of Int64

Details

The satellite’s PRN index, set as:

An integer in the range [1, 210] — Use this value to enter the PRN index for an individual satellite.
A vector of integers in the range [1, 210] — Use this value to enter PRN indexes for multiple satellites.

If for the parameter Signal Type the value is set l2c, then the PRN indexes should be in the range [1, 63] or [159, 210].

Default value	`1`
Program usage name	`PRNID`
Tunable	No
Evaluatable	Yes

# Is L2C In Phase Quadrature — enabling quadrature sealing for L2C and L2P
Logical

Details

Enabling phase quadrature for L2C and L2P:

the box is checked — use this option to set the accuracy code (P-code) for the common-mode branch (I-branch), as well as the civil code of medium duration (CM) and the civil long code (CL) for the quadrature branch (Q-branch);
unchecked, use this option to install all the codes in the I-branch.

Dependencies

To use this parameter, set for the parameter Signal Type meaning l2c.

Default value	`true (switched on)`
Program usage name	`IsL2CInPhaseQuadrature`
Tunable	No
Evaluatable	No

# Enable PCode — The P-code indicator
Logical

Details

The P-code indicator.

In cases where the P-code is not needed, uncheck this box to increase the speed of execution.

If the checkbox is unchecked, the P-code in the I-branch is set to 0.

Dependencies

To use this parameter, set for the parameter Signal Type meaning legacy or l2c.

Default value	`false (switched off)`
Program usage name	`EnablePCode`
Tunable	No
Evaluatable	No

# Has Data With PCode — the ability to transfer data using a P-code
Logical

Details

The ability to transmit data using a P-code, specified as a numeric or logical value. If this option is selected, the data is transmitted along with the P-code.

Dependencies

To use this parameter, set for the parameter Signal Type meaning legacy or l2c, and check the box Enable PCode.

Default value	`true (switched on)`
Program usage name	`HasDataWithPCode`
Tunable	No
Evaluatable	No

# Has Data With CA Code — the ability to transmit data with a coarse capture code (C/A code)
Logical

Details

The ability to transmit data with a coarse capture code (C/A code), set as a numeric or logical value. If the box is checked, the data is transmitted along with the C/A code.

Dependencies

To use this parameter, set for the parameter Signal Type meaning legacy.

Default value	`true (switched on)`
Program usage name	`HasDataWithCACode`
Tunable	No
Evaluatable	No

# Initial Time — the initial time is within one week, from
Real number

Details

The initial time for one week in seconds, set as a real scalar in the range [0, 604800].

Dependencies

To use this parameter:

set for the parameter Signal Type meaning l1c, l2c or l5;
set for the parameter Signal Type meaning legacy and check the box Enable PCode.

Default value	`0`
Program usage name	`InitialTime`
Tunable	No
Evaluatable	Yes

# Sample Rate — sampling rate of the signal, Hz
Real number

Details

The sampling frequency of the signal in Hz, set as a scalar, is greater than 1e6.

Default value	`10.23e6`
Program usage name	`SampleRate`
Tunable	No
Evaluatable	Yes