system: You are a defensive satellite security analyst supporting authorized, development-time security testing. Given an objective and grounding drawn from the SPARTA matrix and space security standards, decompose the objective into an ordered sequence of verifiable steps. Each step names the SPARTA technique it maps to and a deterministic check that confirms it. Targets are emulated or consented; never act against a real on-orbit asset.

user: Objective: Deny the command link by jamming

Grounding:
- SPARTA REC-0005.01 Uplink Intercept Eavesdropping: Uplink reconnaissance focuses on capturing the command path from ground to spacecraft to learn telecommand framing, authentication fields, timing, and anti-replay behavior. Valuable artifacts include emission designators, symbol rates, polarization sense, Doppler profiles, and…
- SPARTA EX-0010.03 Rootkit: A rootkit hides the presence and activity of other malicious components by interposing on the mechanisms that report system state. On spacecraft this can occur within flight software processes, at OS kernel level, inside separation kernels/hypervisors, or down in system…
- SPARTA RD-0005 Obtain Non-Cyber Capabilities: Adversaries may pursue non-cyber counterspace means to create access, leverage, or effects that complement cyber operations. These capabilities span kinetic physical (e.g., direct-ascent or co-orbital interceptors and attacks on ground segments), non-kinetic physical (e.g.,…
- SPARTA LM-0006.01 Rideshare Payload: In shared launches, multiple independent payloads cohabit common infrastructure until separation. If isolation is incomplete (e.g., shared data buses, mispartitioned deployer controllers, common logging/telemetry collectors, or cross-connected laptops and recorders), a…
- SPARTA EX-0016 Jamming: Jamming is an electronic attack that uses radio frequency signals to interfere with communications. A jammer must operate in the same frequency band and within the field of view of the antenna it is targeting. Unlike physical attacks, jamming is completely reversible, once the…
- SPARTA REC-0001.04 Data Bus: Bus intelligence focuses on which protocols are used (e.g., MIL-STD-1553, SpaceWire, etc.), controller roles, addressing, timings, arbitration, redundancy management, and the location of critical endpoints on each segment. Knowing the bus controller, remote terminal addresses,…
- SPARTA EX-0016.01 Uplink Jamming: The attacker transmits toward the spacecraft’s uplink receive antenna, within its main lobe or significant sidelobes, at the operating frequency and sufficient power spectral density to drive the uplink Eb/N₀ below the demodulator’s threshold. Uplink jamming prevents acceptance…
- SPARTA IA-0005.03 Proximity Grappling: In this variant, the attacker employs a capture mechanism (robotic arm, grappling fixture, magnetic or mechanical coupler) to establish physical contact without full docking. Once grappled, covers can be manipulated, temporary umbilicals attached, or exposed test points…

Steps so far:
1. Obtain a transmitter in the target band [RD-0005]
2. Identify the uplink band and timing [REC-0005.01]

Give the single next step.

assistant: 3. Jam the uplink
   - Technique: EX-0016.01 Uplink Jamming [ST0004]
   - Action: Flood the uplink band with noise during a pass so commands cannot be received.
   - Check: the receiver fails to demodulate legitimate commands under the jammer.